diff --git a/debian/changelog b/debian/changelog index c0d273587..b73d4a67b 100644 --- a/debian/changelog +++ b/debian/changelog @@ -375,6 +375,58 @@ linux (4.16.10-1) UNRELEASED; urgency=medium * kbuild: use -fmacro-prefix-map to make __FILE__ a relative path * Bump ABI to 2 * [rt] Update to 4.16.8-rt3 + * [x86] Add support for disabling Speculative Store Bypass (CVE-2018-3639): + - x86/nospec: Simplify alternative_msr_write() + - x86/bugs: Concentrate bug detection into a separate function + - x86/bugs: Concentrate bug reporting into a separate function + - x86/bugs: Read SPEC_CTRL MSR during boot and re-use reserved bits + - x86/bugs, KVM: Support the combination of guest and host IBRS + - x86/bugs: Expose /sys/../spec_store_bypass + - x86/cpufeatures: Add X86_FEATURE_RDS + - x86/bugs: Provide boot parameters for the spec_store_bypass_disable + mitigation + - x86/bugs/intel: Set proper CPU features and setup RDS + - x86/bugs: Whitelist allowed SPEC_CTRL MSR values + - x86/bugs/AMD: Add support to disable RDS on Fam[15,16,17]h if requested + - x86/KVM/VMX: Expose SPEC_CTRL Bit(2) to the guest + - x86/speculation: Create spec-ctrl.h to avoid include hell + - prctl: Add speculation control prctls + - x86/process: Allow runtime control of Speculative Store Bypass + - x86/speculation: Add prctl for Speculative Store Bypass mitigation + - nospec: Allow getting/setting on non-current task + - proc: Provide details on speculation flaw mitigations + - seccomp: Enable speculation flaw mitigations + - x86/bugs: Make boot modes __ro_after_init + - prctl: Add force disable speculation + - seccomp: Use PR_SPEC_FORCE_DISABLE + - seccomp: Add filter flag to opt-out of SSB mitigation + - seccomp: Move speculation migitation control to arch code + - x86/speculation: Make "seccomp" the default mode for Speculative Store + Bypass + - x86/bugs: Rename _RDS to _SSBD + - proc: Use underscores for SSBD in 'status' + - Documentation/spec_ctrl: Do some minor cleanups + - x86/bugs: Fix __ssb_select_mitigation() return type + - x86/bugs: Make cpu_show_common() static + - x86/bugs: Fix the parameters alignment and missing void + - x86/cpu: Make alternative_msr_write work for 32-bit code + - KVM: SVM: Move spec control call after restore of GS + - x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP + - x86/cpufeatures: Disentangle MSR_SPEC_CTRL enumeration from IBRS + - x86/cpufeatures: Disentangle SSBD enumeration + - x86/cpufeatures: Add FEATURE_ZEN + - x86/speculation: Handle HT correctly on AMD + - x86/bugs, KVM: Extend speculation control for VIRT_SPEC_CTRL + - x86/speculation: Add virtualized speculative store bypass disable support + - x86/speculation: Rework speculative_store_bypass_update() + - x86/bugs: Unify x86_spec_ctrl_{set_guest,restore_host} + - x86/bugs: Expose x86_spec_ctrl_base directly + - x86/bugs: Remove x86_spec_ctrl_set() + - x86/bugs: Rework spec_ctrl base and mask logic + - x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG + - KVM: SVM: Implement VIRT_SPEC_CTRL support for SSBD + - x86/bugs: Rename SSBD_NO to SSB_NO + - bpf: Prevent memory disambiguation attack [ Salvatore Bonaccorso ] * [rt] Update to 4.16.7-rt1 and reenable diff --git a/debian/patches/bugfix/x86/ssb/bpf-prevent-memory-disambiguation-attack.patch b/debian/patches/bugfix/x86/ssb/bpf-prevent-memory-disambiguation-attack.patch new file mode 100644 index 000000000..a09c852c6 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/bpf-prevent-memory-disambiguation-attack.patch @@ -0,0 +1,138 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Alexei Starovoitov +Date: Tue, 15 May 2018 09:27:05 -0700 +Subject: bpf: Prevent memory disambiguation attack + +From: Alexei Starovoitov + +commit af86ca4e3088fe5eacf2f7e58c01fa68ca067672 upstream + +Detect code patterns where malicious 'speculative store bypass' can be used +and sanitize such patterns. + + 39: (bf) r3 = r10 + 40: (07) r3 += -216 + 41: (79) r8 = *(u64 *)(r7 +0) // slow read + 42: (7a) *(u64 *)(r10 -72) = 0 // verifier inserts this instruction + 43: (7b) *(u64 *)(r8 +0) = r3 // this store becomes slow due to r8 + 44: (79) r1 = *(u64 *)(r6 +0) // cpu speculatively executes this load + 45: (71) r2 = *(u8 *)(r1 +0) // speculatively arbitrary 'load byte' + // is now sanitized + +Above code after x86 JIT becomes: + e5: mov %rbp,%rdx + e8: add $0xffffffffffffff28,%rdx + ef: mov 0x0(%r13),%r14 + f3: movq $0x0,-0x48(%rbp) + fb: mov %rdx,0x0(%r14) + ff: mov 0x0(%rbx),%rdi +103: movzbq 0x0(%rdi),%rsi + +Signed-off-by: Alexei Starovoitov +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + include/linux/bpf_verifier.h | 1 + kernel/bpf/verifier.c | 59 ++++++++++++++++++++++++++++++++++++++++--- + 2 files changed, 57 insertions(+), 3 deletions(-) + +--- a/include/linux/bpf_verifier.h ++++ b/include/linux/bpf_verifier.h +@@ -146,6 +146,7 @@ struct bpf_insn_aux_data { + s32 call_imm; /* saved imm field of call insn */ + }; + int ctx_field_size; /* the ctx field size for load insn, maybe 0 */ ++ int sanitize_stack_off; /* stack slot to be cleared */ + bool seen; /* this insn was processed by the verifier */ + }; + +--- a/kernel/bpf/verifier.c ++++ b/kernel/bpf/verifier.c +@@ -970,7 +970,7 @@ static bool register_is_null(struct bpf_ + */ + static int check_stack_write(struct bpf_verifier_env *env, + struct bpf_func_state *state, /* func where register points to */ +- int off, int size, int value_regno) ++ int off, int size, int value_regno, int insn_idx) + { + struct bpf_func_state *cur; /* state of the current function */ + int i, slot = -off - 1, spi = slot / BPF_REG_SIZE, err; +@@ -1009,8 +1009,33 @@ static int check_stack_write(struct bpf_ + state->stack[spi].spilled_ptr = cur->regs[value_regno]; + state->stack[spi].spilled_ptr.live |= REG_LIVE_WRITTEN; + +- for (i = 0; i < BPF_REG_SIZE; i++) ++ for (i = 0; i < BPF_REG_SIZE; i++) { ++ if (state->stack[spi].slot_type[i] == STACK_MISC && ++ !env->allow_ptr_leaks) { ++ int *poff = &env->insn_aux_data[insn_idx].sanitize_stack_off; ++ int soff = (-spi - 1) * BPF_REG_SIZE; ++ ++ /* detected reuse of integer stack slot with a pointer ++ * which means either llvm is reusing stack slot or ++ * an attacker is trying to exploit CVE-2018-3639 ++ * (speculative store bypass) ++ * Have to sanitize that slot with preemptive ++ * store of zero. ++ */ ++ if (*poff && *poff != soff) { ++ /* disallow programs where single insn stores ++ * into two different stack slots, since verifier ++ * cannot sanitize them ++ */ ++ verbose(env, ++ "insn %d cannot access two stack slots fp%d and fp%d", ++ insn_idx, *poff, soff); ++ return -EINVAL; ++ } ++ *poff = soff; ++ } + state->stack[spi].slot_type[i] = STACK_SPILL; ++ } + } else { + u8 type = STACK_MISC; + +@@ -1685,7 +1710,7 @@ static int check_mem_access(struct bpf_v + + if (t == BPF_WRITE) + err = check_stack_write(env, state, off, size, +- value_regno); ++ value_regno, insn_idx); + else + err = check_stack_read(env, state, off, size, + value_regno); +@@ -5156,6 +5181,34 @@ static int convert_ctx_accesses(struct b + else + continue; + ++ if (type == BPF_WRITE && ++ env->insn_aux_data[i + delta].sanitize_stack_off) { ++ struct bpf_insn patch[] = { ++ /* Sanitize suspicious stack slot with zero. ++ * There are no memory dependencies for this store, ++ * since it's only using frame pointer and immediate ++ * constant of zero ++ */ ++ BPF_ST_MEM(BPF_DW, BPF_REG_FP, ++ env->insn_aux_data[i + delta].sanitize_stack_off, ++ 0), ++ /* the original STX instruction will immediately ++ * overwrite the same stack slot with appropriate value ++ */ ++ *insn, ++ }; ++ ++ cnt = ARRAY_SIZE(patch); ++ new_prog = bpf_patch_insn_data(env, i + delta, patch, cnt); ++ if (!new_prog) ++ return -ENOMEM; ++ ++ delta += cnt - 1; ++ env->prog = new_prog; ++ insn = new_prog->insnsi + i + delta; ++ continue; ++ } ++ + if (env->insn_aux_data[i + delta].ptr_type != PTR_TO_CTX) + continue; + diff --git a/debian/patches/bugfix/x86/ssb/documentation-spec_ctrl-do-some-minor-cleanups.patch b/debian/patches/bugfix/x86/ssb/documentation-spec_ctrl-do-some-minor-cleanups.patch new file mode 100644 index 000000000..fe8c1b949 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/documentation-spec_ctrl-do-some-minor-cleanups.patch @@ -0,0 +1,83 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Borislav Petkov +Date: Tue, 8 May 2018 15:43:45 +0200 +Subject: Documentation/spec_ctrl: Do some minor cleanups + +From: Borislav Petkov + +commit dd0792699c4058e63c0715d9a7c2d40226fcdddc upstream + +Fix some typos, improve formulations, end sentences with a fullstop. + +Signed-off-by: Borislav Petkov +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/userspace-api/spec_ctrl.rst | 24 ++++++++++++------------ + 1 file changed, 12 insertions(+), 12 deletions(-) + +--- a/Documentation/userspace-api/spec_ctrl.rst ++++ b/Documentation/userspace-api/spec_ctrl.rst +@@ -2,13 +2,13 @@ + Speculation Control + =================== + +-Quite some CPUs have speculation related misfeatures which are in fact +-vulnerabilites causing data leaks in various forms even accross privilege +-domains. ++Quite some CPUs have speculation-related misfeatures which are in ++fact vulnerabilities causing data leaks in various forms even across ++privilege domains. + + The kernel provides mitigation for such vulnerabilities in various +-forms. Some of these mitigations are compile time configurable and some on +-the kernel command line. ++forms. Some of these mitigations are compile-time configurable and some ++can be supplied on the kernel command line. + + There is also a class of mitigations which are very expensive, but they can + be restricted to a certain set of processes or tasks in controlled +@@ -32,18 +32,18 @@ the following meaning: + Bit Define Description + ==== ===================== =================================================== + 0 PR_SPEC_PRCTL Mitigation can be controlled per task by +- PR_SET_SPECULATION_CTRL ++ PR_SET_SPECULATION_CTRL. + 1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is +- disabled ++ disabled. + 2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is +- enabled ++ enabled. + 3 PR_SPEC_FORCE_DISABLE Same as PR_SPEC_DISABLE, but cannot be undone. A + subsequent prctl(..., PR_SPEC_ENABLE) will fail. + ==== ===================== =================================================== + + If all bits are 0 the CPU is not affected by the speculation misfeature. + +-If PR_SPEC_PRCTL is set, then the per task control of the mitigation is ++If PR_SPEC_PRCTL is set, then the per-task control of the mitigation is + available. If not set, prctl(PR_SET_SPECULATION_CTRL) for the speculation + misfeature will fail. + +@@ -61,9 +61,9 @@ Common error codes + Value Meaning + ======= ================================================================= + EINVAL The prctl is not implemented by the architecture or unused +- prctl(2) arguments are not 0 ++ prctl(2) arguments are not 0. + +-ENODEV arg2 is selecting a not supported speculation misfeature ++ENODEV arg2 is selecting a not supported speculation misfeature. + ======= ================================================================= + + PR_SET_SPECULATION_CTRL error codes +@@ -74,7 +74,7 @@ Value Meaning + 0 Success + + ERANGE arg3 is incorrect, i.e. it's neither PR_SPEC_ENABLE nor +- PR_SPEC_DISABLE nor PR_SPEC_FORCE_DISABLE ++ PR_SPEC_DISABLE nor PR_SPEC_FORCE_DISABLE. + + ENXIO Control of the selected speculation misfeature is not possible. + See PR_GET_SPECULATION_CTRL. diff --git a/debian/patches/bugfix/x86/ssb/kvm-svm-implement-virt_spec_ctrl-support-for-ssbd.patch b/debian/patches/bugfix/x86/ssb/kvm-svm-implement-virt_spec_ctrl-support-for-ssbd.patch new file mode 100644 index 000000000..f1e54a258 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/kvm-svm-implement-virt_spec_ctrl-support-for-ssbd.patch @@ -0,0 +1,206 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Tom Lendacky +Date: Thu, 10 May 2018 22:06:39 +0200 +Subject: KVM: SVM: Implement VIRT_SPEC_CTRL support for SSBD + +From: Tom Lendacky + +commit bc226f07dcd3c9ef0b7f6236fe356ea4a9cb4769 upstream + +Expose the new virtualized architectural mechanism, VIRT_SSBD, for using +speculative store bypass disable (SSBD) under SVM. This will allow guests +to use SSBD on hardware that uses non-architectural mechanisms for enabling +SSBD. + +[ tglx: Folded the migration fixup from Paolo Bonzini ] + +Signed-off-by: Tom Lendacky +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/kvm_host.h | 2 +- + arch/x86/kernel/cpu/common.c | 3 ++- + arch/x86/kvm/cpuid.c | 11 +++++++++-- + arch/x86/kvm/svm.c | 21 +++++++++++++++++++-- + arch/x86/kvm/vmx.c | 18 +++++++++++++++--- + arch/x86/kvm/x86.c | 13 ++++--------- + 6 files changed, 50 insertions(+), 18 deletions(-) + +--- a/arch/x86/include/asm/kvm_host.h ++++ b/arch/x86/include/asm/kvm_host.h +@@ -933,7 +933,7 @@ struct kvm_x86_ops { + int (*hardware_setup)(void); /* __init */ + void (*hardware_unsetup)(void); /* __exit */ + bool (*cpu_has_accelerated_tpr)(void); +- bool (*cpu_has_high_real_mode_segbase)(void); ++ bool (*has_emulated_msr)(int index); + void (*cpuid_update)(struct kvm_vcpu *vcpu); + + int (*vm_init)(struct kvm *kvm); +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -767,7 +767,8 @@ static void init_speculation_control(str + if (cpu_has(c, X86_FEATURE_INTEL_STIBP)) + set_cpu_cap(c, X86_FEATURE_STIBP); + +- if (cpu_has(c, X86_FEATURE_SPEC_CTRL_SSBD)) ++ if (cpu_has(c, X86_FEATURE_SPEC_CTRL_SSBD) || ++ cpu_has(c, X86_FEATURE_VIRT_SSBD)) + set_cpu_cap(c, X86_FEATURE_SSBD); + + if (cpu_has(c, X86_FEATURE_AMD_IBRS)) { +--- a/arch/x86/kvm/cpuid.c ++++ b/arch/x86/kvm/cpuid.c +@@ -374,7 +374,7 @@ static inline int __do_cpuid_ent(struct + + /* cpuid 0x80000008.ebx */ + const u32 kvm_cpuid_8000_0008_ebx_x86_features = +- F(AMD_IBPB) | F(AMD_IBRS); ++ F(AMD_IBPB) | F(AMD_IBRS) | F(VIRT_SSBD); + + /* cpuid 0xC0000001.edx */ + const u32 kvm_cpuid_C000_0001_edx_x86_features = +@@ -642,13 +642,20 @@ static inline int __do_cpuid_ent(struct + g_phys_as = phys_as; + entry->eax = g_phys_as | (virt_as << 8); + entry->edx = 0; +- /* IBRS and IBPB aren't necessarily present in hardware cpuid */ ++ /* ++ * IBRS, IBPB and VIRT_SSBD aren't necessarily present in ++ * hardware cpuid ++ */ + if (boot_cpu_has(X86_FEATURE_AMD_IBPB)) + entry->ebx |= F(AMD_IBPB); + if (boot_cpu_has(X86_FEATURE_AMD_IBRS)) + entry->ebx |= F(AMD_IBRS); ++ if (boot_cpu_has(X86_FEATURE_VIRT_SSBD)) ++ entry->ebx |= F(VIRT_SSBD); + entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features; + cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX); ++ if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD)) ++ entry->ebx |= F(VIRT_SSBD); + break; + } + case 0x80000019: +--- a/arch/x86/kvm/svm.c ++++ b/arch/x86/kvm/svm.c +@@ -3971,6 +3971,13 @@ static int svm_get_msr(struct kvm_vcpu * + + msr_info->data = svm->spec_ctrl; + break; ++ case MSR_AMD64_VIRT_SPEC_CTRL: ++ if (!msr_info->host_initiated && ++ !guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD)) ++ return 1; ++ ++ msr_info->data = svm->virt_spec_ctrl; ++ break; + case MSR_F15H_IC_CFG: { + + int family, model; +@@ -4105,6 +4112,16 @@ static int svm_set_msr(struct kvm_vcpu * + break; + set_msr_interception(svm->msrpm, MSR_IA32_PRED_CMD, 0, 1); + break; ++ case MSR_AMD64_VIRT_SPEC_CTRL: ++ if (!msr->host_initiated && ++ !guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD)) ++ return 1; ++ ++ if (data & ~SPEC_CTRL_SSBD) ++ return 1; ++ ++ svm->virt_spec_ctrl = data; ++ break; + case MSR_STAR: + svm->vmcb->save.star = data; + break; +@@ -5635,7 +5652,7 @@ static bool svm_cpu_has_accelerated_tpr( + return false; + } + +-static bool svm_has_high_real_mode_segbase(void) ++static bool svm_has_emulated_msr(int index) + { + return true; + } +@@ -6859,7 +6876,7 @@ static struct kvm_x86_ops svm_x86_ops __ + .hardware_enable = svm_hardware_enable, + .hardware_disable = svm_hardware_disable, + .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr, +- .cpu_has_high_real_mode_segbase = svm_has_high_real_mode_segbase, ++ .has_emulated_msr = svm_has_emulated_msr, + + .vcpu_create = svm_create_vcpu, + .vcpu_free = svm_free_vcpu, +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -9223,9 +9223,21 @@ static void vmx_handle_external_intr(str + } + STACK_FRAME_NON_STANDARD(vmx_handle_external_intr); + +-static bool vmx_has_high_real_mode_segbase(void) ++static bool vmx_has_emulated_msr(int index) + { +- return enable_unrestricted_guest || emulate_invalid_guest_state; ++ switch (index) { ++ case MSR_IA32_SMBASE: ++ /* ++ * We cannot do SMM unless we can run the guest in big ++ * real mode. ++ */ ++ return enable_unrestricted_guest || emulate_invalid_guest_state; ++ case MSR_AMD64_VIRT_SPEC_CTRL: ++ /* This is AMD only. */ ++ return false; ++ default: ++ return true; ++ } + } + + static bool vmx_mpx_supported(void) +@@ -12295,7 +12307,7 @@ static struct kvm_x86_ops vmx_x86_ops __ + .hardware_enable = hardware_enable, + .hardware_disable = hardware_disable, + .cpu_has_accelerated_tpr = report_flexpriority, +- .cpu_has_high_real_mode_segbase = vmx_has_high_real_mode_segbase, ++ .has_emulated_msr = vmx_has_emulated_msr, + + .vcpu_create = vmx_create_vcpu, + .vcpu_free = vmx_free_vcpu, +--- a/arch/x86/kvm/x86.c ++++ b/arch/x86/kvm/x86.c +@@ -1045,6 +1045,7 @@ static u32 emulated_msrs[] = { + MSR_SMI_COUNT, + MSR_PLATFORM_INFO, + MSR_MISC_FEATURES_ENABLES, ++ MSR_AMD64_VIRT_SPEC_CTRL, + }; + + static unsigned num_emulated_msrs; +@@ -2843,7 +2844,7 @@ int kvm_vm_ioctl_check_extension(struct + * fringe case that is not enabled except via specific settings + * of the module parameters. + */ +- r = kvm_x86_ops->cpu_has_high_real_mode_segbase(); ++ r = kvm_x86_ops->has_emulated_msr(MSR_IA32_SMBASE); + break; + case KVM_CAP_VAPIC: + r = !kvm_x86_ops->cpu_has_accelerated_tpr(); +@@ -4522,14 +4523,8 @@ static void kvm_init_msr_list(void) + num_msrs_to_save = j; + + for (i = j = 0; i < ARRAY_SIZE(emulated_msrs); i++) { +- switch (emulated_msrs[i]) { +- case MSR_IA32_SMBASE: +- if (!kvm_x86_ops->cpu_has_high_real_mode_segbase()) +- continue; +- break; +- default: +- break; +- } ++ if (!kvm_x86_ops->has_emulated_msr(emulated_msrs[i])) ++ continue; + + if (j < i) + emulated_msrs[j] = emulated_msrs[i]; diff --git a/debian/patches/bugfix/x86/ssb/kvm-svm-move-spec-control-call-after-restore-of-gs.patch b/debian/patches/bugfix/x86/ssb/kvm-svm-move-spec-control-call-after-restore-of-gs.patch new file mode 100644 index 000000000..5c81b208a --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/kvm-svm-move-spec-control-call-after-restore-of-gs.patch @@ -0,0 +1,66 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Fri, 11 May 2018 15:21:01 +0200 +Subject: KVM: SVM: Move spec control call after restore of GS + +From: Thomas Gleixner + +commit 15e6c22fd8e5a42c5ed6d487b7c9fe44c2517765 upstream + +svm_vcpu_run() invokes x86_spec_ctrl_restore_host() after VMEXIT, but +before the host GS is restored. x86_spec_ctrl_restore_host() uses 'current' +to determine the host SSBD state of the thread. 'current' is GS based, but +host GS is not yet restored and the access causes a triple fault. + +Move the call after the host GS restore. + +Fixes: 885f82bfbc6f x86/process: Allow runtime control of Speculative Store Bypass +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Acked-by: Paolo Bonzini +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kvm/svm.c | 24 ++++++++++++------------ + 1 file changed, 12 insertions(+), 12 deletions(-) + +--- a/arch/x86/kvm/svm.c ++++ b/arch/x86/kvm/svm.c +@@ -5495,6 +5495,18 @@ static void svm_vcpu_run(struct kvm_vcpu + #endif + ); + ++ /* Eliminate branch target predictions from guest mode */ ++ vmexit_fill_RSB(); ++ ++#ifdef CONFIG_X86_64 ++ wrmsrl(MSR_GS_BASE, svm->host.gs_base); ++#else ++ loadsegment(fs, svm->host.fs); ++#ifndef CONFIG_X86_32_LAZY_GS ++ loadsegment(gs, svm->host.gs); ++#endif ++#endif ++ + /* + * We do not use IBRS in the kernel. If this vCPU has used the + * SPEC_CTRL MSR it may have left it on; save the value and +@@ -5515,18 +5527,6 @@ static void svm_vcpu_run(struct kvm_vcpu + + x86_spec_ctrl_restore_host(svm->spec_ctrl); + +- /* Eliminate branch target predictions from guest mode */ +- vmexit_fill_RSB(); +- +-#ifdef CONFIG_X86_64 +- wrmsrl(MSR_GS_BASE, svm->host.gs_base); +-#else +- loadsegment(fs, svm->host.fs); +-#ifndef CONFIG_X86_32_LAZY_GS +- loadsegment(gs, svm->host.gs); +-#endif +-#endif +- + reload_tss(vcpu); + + local_irq_disable(); diff --git a/debian/patches/bugfix/x86/ssb/nospec-allow-getting-setting-on-non-current-task.patch b/debian/patches/bugfix/x86/ssb/nospec-allow-getting-setting-on-non-current-task.patch new file mode 100644 index 000000000..e9b0e7ac9 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/nospec-allow-getting-setting-on-non-current-task.patch @@ -0,0 +1,154 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Kees Cook +Date: Tue, 1 May 2018 15:19:04 -0700 +Subject: nospec: Allow getting/setting on non-current task + +From: Kees Cook + +commit 7bbf1373e228840bb0295a2ca26d548ef37f448e upstream + +Adjust arch_prctl_get/set_spec_ctrl() to operate on tasks other than +current. + +This is needed both for /proc/$pid/status queries and for seccomp (since +thread-syncing can trigger seccomp in non-current threads). + +Signed-off-by: Kees Cook +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 27 ++++++++++++++++----------- + include/linux/nospec.h | 7 +++++-- + kernel/sys.c | 9 +++++---- + 3 files changed, 26 insertions(+), 17 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -530,31 +530,35 @@ static void ssb_select_mitigation() + + #undef pr_fmt + +-static int ssb_prctl_set(unsigned long ctrl) ++static int ssb_prctl_set(struct task_struct *task, unsigned long ctrl) + { +- bool rds = !!test_tsk_thread_flag(current, TIF_RDS); ++ bool rds = !!test_tsk_thread_flag(task, TIF_RDS); + + if (ssb_mode != SPEC_STORE_BYPASS_PRCTL) + return -ENXIO; + + if (ctrl == PR_SPEC_ENABLE) +- clear_tsk_thread_flag(current, TIF_RDS); ++ clear_tsk_thread_flag(task, TIF_RDS); + else +- set_tsk_thread_flag(current, TIF_RDS); ++ set_tsk_thread_flag(task, TIF_RDS); + +- if (rds != !!test_tsk_thread_flag(current, TIF_RDS)) ++ /* ++ * If being set on non-current task, delay setting the CPU ++ * mitigation until it is next scheduled. ++ */ ++ if (task == current && rds != !!test_tsk_thread_flag(task, TIF_RDS)) + speculative_store_bypass_update(); + + return 0; + } + +-static int ssb_prctl_get(void) ++static int ssb_prctl_get(struct task_struct *task) + { + switch (ssb_mode) { + case SPEC_STORE_BYPASS_DISABLE: + return PR_SPEC_DISABLE; + case SPEC_STORE_BYPASS_PRCTL: +- if (test_tsk_thread_flag(current, TIF_RDS)) ++ if (test_tsk_thread_flag(task, TIF_RDS)) + return PR_SPEC_PRCTL | PR_SPEC_DISABLE; + return PR_SPEC_PRCTL | PR_SPEC_ENABLE; + default: +@@ -564,24 +568,25 @@ static int ssb_prctl_get(void) + } + } + +-int arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl) ++int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, ++ unsigned long ctrl) + { + if (ctrl != PR_SPEC_ENABLE && ctrl != PR_SPEC_DISABLE) + return -ERANGE; + + switch (which) { + case PR_SPEC_STORE_BYPASS: +- return ssb_prctl_set(ctrl); ++ return ssb_prctl_set(task, ctrl); + default: + return -ENODEV; + } + } + +-int arch_prctl_spec_ctrl_get(unsigned long which) ++int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which) + { + switch (which) { + case PR_SPEC_STORE_BYPASS: +- return ssb_prctl_get(); ++ return ssb_prctl_get(task); + default: + return -ENODEV; + } +--- a/include/linux/nospec.h ++++ b/include/linux/nospec.h +@@ -7,6 +7,8 @@ + #define _LINUX_NOSPEC_H + #include + ++struct task_struct; ++ + /** + * array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise + * @index: array element index +@@ -57,7 +59,8 @@ static inline unsigned long array_index_ + }) + + /* Speculation control prctl */ +-int arch_prctl_spec_ctrl_get(unsigned long which); +-int arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl); ++int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which); ++int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, ++ unsigned long ctrl); + + #endif /* _LINUX_NOSPEC_H */ +--- a/kernel/sys.c ++++ b/kernel/sys.c +@@ -2192,12 +2192,13 @@ static int propagate_has_child_subreaper + return 1; + } + +-int __weak arch_prctl_spec_ctrl_get(unsigned long which) ++int __weak arch_prctl_spec_ctrl_get(struct task_struct *t, unsigned long which) + { + return -EINVAL; + } + +-int __weak arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl) ++int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which, ++ unsigned long ctrl) + { + return -EINVAL; + } +@@ -2413,12 +2414,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsi + case PR_GET_SPECULATION_CTRL: + if (arg3 || arg4 || arg5) + return -EINVAL; +- error = arch_prctl_spec_ctrl_get(arg2); ++ error = arch_prctl_spec_ctrl_get(me, arg2); + break; + case PR_SET_SPECULATION_CTRL: + if (arg4 || arg5) + return -EINVAL; +- error = arch_prctl_spec_ctrl_set(arg2, arg3); ++ error = arch_prctl_spec_ctrl_set(me, arg2, arg3); + break; + default: + error = -EINVAL; diff --git a/debian/patches/bugfix/x86/ssb/prctl-add-force-disable-speculation.patch b/debian/patches/bugfix/x86/ssb/prctl-add-force-disable-speculation.patch new file mode 100644 index 000000000..3c6a44a9f --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/prctl-add-force-disable-speculation.patch @@ -0,0 +1,207 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Thu, 3 May 2018 22:09:15 +0200 +Subject: prctl: Add force disable speculation + +From: Thomas Gleixner + +commit 356e4bfff2c5489e016fdb925adbf12a1e3950ee upstream + +For certain use cases it is desired to enforce mitigations so they cannot +be undone afterwards. That's important for loader stubs which want to +prevent a child from disabling the mitigation again. Will also be used for +seccomp(). The extra state preserving of the prctl state for SSB is a +preparatory step for EBPF dymanic speculation control. + +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/userspace-api/spec_ctrl.rst | 34 ++++++++++++++++++----------- + arch/x86/kernel/cpu/bugs.c | 35 +++++++++++++++++++++--------- + fs/proc/array.c | 3 ++ + include/linux/sched.h | 10 +++++++- + include/uapi/linux/prctl.h | 1 + 5 files changed, 59 insertions(+), 24 deletions(-) + +--- a/Documentation/userspace-api/spec_ctrl.rst ++++ b/Documentation/userspace-api/spec_ctrl.rst +@@ -25,19 +25,21 @@ PR_GET_SPECULATION_CTRL + ----------------------- + + PR_GET_SPECULATION_CTRL returns the state of the speculation misfeature +-which is selected with arg2 of prctl(2). The return value uses bits 0-2 with ++which is selected with arg2 of prctl(2). The return value uses bits 0-3 with + the following meaning: + +-==== ================ =================================================== +-Bit Define Description +-==== ================ =================================================== +-0 PR_SPEC_PRCTL Mitigation can be controlled per task by +- PR_SET_SPECULATION_CTRL +-1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is +- disabled +-2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is +- enabled +-==== ================ =================================================== ++==== ===================== =================================================== ++Bit Define Description ++==== ===================== =================================================== ++0 PR_SPEC_PRCTL Mitigation can be controlled per task by ++ PR_SET_SPECULATION_CTRL ++1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is ++ disabled ++2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is ++ enabled ++3 PR_SPEC_FORCE_DISABLE Same as PR_SPEC_DISABLE, but cannot be undone. A ++ subsequent prctl(..., PR_SPEC_ENABLE) will fail. ++==== ===================== =================================================== + + If all bits are 0 the CPU is not affected by the speculation misfeature. + +@@ -47,9 +49,11 @@ misfeature will fail. + + PR_SET_SPECULATION_CTRL + ----------------------- ++ + PR_SET_SPECULATION_CTRL allows to control the speculation misfeature, which + is selected by arg2 of :manpage:`prctl(2)` per task. arg3 is used to hand +-in the control value, i.e. either PR_SPEC_ENABLE or PR_SPEC_DISABLE. ++in the control value, i.e. either PR_SPEC_ENABLE or PR_SPEC_DISABLE or ++PR_SPEC_FORCE_DISABLE. + + Common error codes + ------------------ +@@ -70,10 +74,13 @@ Value Meaning + 0 Success + + ERANGE arg3 is incorrect, i.e. it's neither PR_SPEC_ENABLE nor +- PR_SPEC_DISABLE ++ PR_SPEC_DISABLE nor PR_SPEC_FORCE_DISABLE + + ENXIO Control of the selected speculation misfeature is not possible. + See PR_GET_SPECULATION_CTRL. ++ ++EPERM Speculation was disabled with PR_SPEC_FORCE_DISABLE and caller ++ tried to enable it again. + ======= ================================================================= + + Speculation misfeature controls +@@ -84,3 +91,4 @@ Speculation misfeature controls + * prctl(PR_GET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, 0, 0, 0); + * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_ENABLE, 0, 0); + * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0); ++ * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_FORCE_DISABLE, 0, 0); +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -533,21 +533,37 @@ static void ssb_select_mitigation() + + static int ssb_prctl_set(struct task_struct *task, unsigned long ctrl) + { +- bool rds = !!test_tsk_thread_flag(task, TIF_RDS); ++ bool update; + + if (ssb_mode != SPEC_STORE_BYPASS_PRCTL) + return -ENXIO; + +- if (ctrl == PR_SPEC_ENABLE) +- clear_tsk_thread_flag(task, TIF_RDS); +- else +- set_tsk_thread_flag(task, TIF_RDS); ++ switch (ctrl) { ++ case PR_SPEC_ENABLE: ++ /* If speculation is force disabled, enable is not allowed */ ++ if (task_spec_ssb_force_disable(task)) ++ return -EPERM; ++ task_clear_spec_ssb_disable(task); ++ update = test_and_clear_tsk_thread_flag(task, TIF_RDS); ++ break; ++ case PR_SPEC_DISABLE: ++ task_set_spec_ssb_disable(task); ++ update = !test_and_set_tsk_thread_flag(task, TIF_RDS); ++ break; ++ case PR_SPEC_FORCE_DISABLE: ++ task_set_spec_ssb_disable(task); ++ task_set_spec_ssb_force_disable(task); ++ update = !test_and_set_tsk_thread_flag(task, TIF_RDS); ++ break; ++ default: ++ return -ERANGE; ++ } + + /* + * If being set on non-current task, delay setting the CPU + * mitigation until it is next scheduled. + */ +- if (task == current && rds != !!test_tsk_thread_flag(task, TIF_RDS)) ++ if (task == current && update) + speculative_store_bypass_update(); + + return 0; +@@ -559,7 +575,9 @@ static int ssb_prctl_get(struct task_str + case SPEC_STORE_BYPASS_DISABLE: + return PR_SPEC_DISABLE; + case SPEC_STORE_BYPASS_PRCTL: +- if (test_tsk_thread_flag(task, TIF_RDS)) ++ if (task_spec_ssb_force_disable(task)) ++ return PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE; ++ if (task_spec_ssb_disable(task)) + return PR_SPEC_PRCTL | PR_SPEC_DISABLE; + return PR_SPEC_PRCTL | PR_SPEC_ENABLE; + default: +@@ -572,9 +590,6 @@ static int ssb_prctl_get(struct task_str + int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, + unsigned long ctrl) + { +- if (ctrl != PR_SPEC_ENABLE && ctrl != PR_SPEC_DISABLE) +- return -ERANGE; +- + switch (which) { + case PR_SPEC_STORE_BYPASS: + return ssb_prctl_set(task, ctrl); +--- a/fs/proc/array.c ++++ b/fs/proc/array.c +@@ -356,6 +356,9 @@ static inline void task_seccomp(struct s + case PR_SPEC_NOT_AFFECTED: + seq_printf(m, "not vulnerable"); + break; ++ case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: ++ seq_printf(m, "thread force mitigated"); ++ break; + case PR_SPEC_PRCTL | PR_SPEC_DISABLE: + seq_printf(m, "thread mitigated"); + break; +--- a/include/linux/sched.h ++++ b/include/linux/sched.h +@@ -1365,7 +1365,8 @@ static inline bool is_percpu_thread(void + #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ + #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ + #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ +- ++#define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ ++#define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ + + #define TASK_PFA_TEST(name, func) \ + static inline bool task_##func(struct task_struct *p) \ +@@ -1390,6 +1391,13 @@ TASK_PFA_TEST(SPREAD_SLAB, spread_slab) + TASK_PFA_SET(SPREAD_SLAB, spread_slab) + TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) + ++TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) ++TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) ++TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) ++ ++TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) ++TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) ++ + static inline void + current_restore_flags(unsigned long orig_flags, unsigned long flags) + { +--- a/include/uapi/linux/prctl.h ++++ b/include/uapi/linux/prctl.h +@@ -217,5 +217,6 @@ struct prctl_mm_map { + # define PR_SPEC_PRCTL (1UL << 0) + # define PR_SPEC_ENABLE (1UL << 1) + # define PR_SPEC_DISABLE (1UL << 2) ++# define PR_SPEC_FORCE_DISABLE (1UL << 3) + + #endif /* _LINUX_PRCTL_H */ diff --git a/debian/patches/bugfix/x86/ssb/prctl-add-speculation-control-prctls.patch b/debian/patches/bugfix/x86/ssb/prctl-add-speculation-control-prctls.patch new file mode 100644 index 000000000..b5798e75c --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/prctl-add-speculation-control-prctls.patch @@ -0,0 +1,239 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sun, 29 Apr 2018 15:20:11 +0200 +Subject: prctl: Add speculation control prctls + +From: Thomas Gleixner + +commit b617cfc858161140d69cc0b5cc211996b557a1c7 upstream + +Add two new prctls to control aspects of speculation related vulnerabilites +and their mitigations to provide finer grained control over performance +impacting mitigations. + +PR_GET_SPECULATION_CTRL returns the state of the speculation misfeature +which is selected with arg2 of prctl(2). The return value uses bit 0-2 with +the following meaning: + +Bit Define Description +0 PR_SPEC_PRCTL Mitigation can be controlled per task by + PR_SET_SPECULATION_CTRL +1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is + disabled +2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is + enabled + +If all bits are 0 the CPU is not affected by the speculation misfeature. + +If PR_SPEC_PRCTL is set, then the per task control of the mitigation is +available. If not set, prctl(PR_SET_SPECULATION_CTRL) for the speculation +misfeature will fail. + +PR_SET_SPECULATION_CTRL allows to control the speculation misfeature, which +is selected by arg2 of prctl(2) per task. arg3 is used to hand in the +control value, i.e. either PR_SPEC_ENABLE or PR_SPEC_DISABLE. + +The common return values are: + +EINVAL prctl is not implemented by the architecture or the unused prctl() + arguments are not 0 +ENODEV arg2 is selecting a not supported speculation misfeature + +PR_SET_SPECULATION_CTRL has these additional return values: + +ERANGE arg3 is incorrect, i.e. it's not either PR_SPEC_ENABLE or PR_SPEC_DISABLE +ENXIO prctl control of the selected speculation misfeature is disabled + +The first supported controlable speculation misfeature is +PR_SPEC_STORE_BYPASS. Add the define so this can be shared between +architectures. + +Based on an initial patch from Tim Chen and mostly rewritten. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/userspace-api/index.rst | 1 + Documentation/userspace-api/spec_ctrl.rst | 86 ++++++++++++++++++++++++++++++ + include/linux/nospec.h | 5 + + include/uapi/linux/prctl.h | 11 +++ + kernel/sys.c | 22 +++++++ + 5 files changed, 125 insertions(+) + create mode 100644 Documentation/userspace-api/spec_ctrl.rst + +--- a/Documentation/userspace-api/index.rst ++++ b/Documentation/userspace-api/index.rst +@@ -19,6 +19,7 @@ place where this information is gathered + no_new_privs + seccomp_filter + unshare ++ spec_ctrl + + .. only:: subproject and html + +--- /dev/null ++++ b/Documentation/userspace-api/spec_ctrl.rst +@@ -0,0 +1,86 @@ ++=================== ++Speculation Control ++=================== ++ ++Quite some CPUs have speculation related misfeatures which are in fact ++vulnerabilites causing data leaks in various forms even accross privilege ++domains. ++ ++The kernel provides mitigation for such vulnerabilities in various ++forms. Some of these mitigations are compile time configurable and some on ++the kernel command line. ++ ++There is also a class of mitigations which are very expensive, but they can ++be restricted to a certain set of processes or tasks in controlled ++environments. The mechanism to control these mitigations is via ++:manpage:`prctl(2)`. ++ ++There are two prctl options which are related to this: ++ ++ * PR_GET_SPECULATION_CTRL ++ ++ * PR_SET_SPECULATION_CTRL ++ ++PR_GET_SPECULATION_CTRL ++----------------------- ++ ++PR_GET_SPECULATION_CTRL returns the state of the speculation misfeature ++which is selected with arg2 of prctl(2). The return value uses bits 0-2 with ++the following meaning: ++ ++==== ================ =================================================== ++Bit Define Description ++==== ================ =================================================== ++0 PR_SPEC_PRCTL Mitigation can be controlled per task by ++ PR_SET_SPECULATION_CTRL ++1 PR_SPEC_ENABLE The speculation feature is enabled, mitigation is ++ disabled ++2 PR_SPEC_DISABLE The speculation feature is disabled, mitigation is ++ enabled ++==== ================ =================================================== ++ ++If all bits are 0 the CPU is not affected by the speculation misfeature. ++ ++If PR_SPEC_PRCTL is set, then the per task control of the mitigation is ++available. If not set, prctl(PR_SET_SPECULATION_CTRL) for the speculation ++misfeature will fail. ++ ++PR_SET_SPECULATION_CTRL ++----------------------- ++PR_SET_SPECULATION_CTRL allows to control the speculation misfeature, which ++is selected by arg2 of :manpage:`prctl(2)` per task. arg3 is used to hand ++in the control value, i.e. either PR_SPEC_ENABLE or PR_SPEC_DISABLE. ++ ++Common error codes ++------------------ ++======= ================================================================= ++Value Meaning ++======= ================================================================= ++EINVAL The prctl is not implemented by the architecture or unused ++ prctl(2) arguments are not 0 ++ ++ENODEV arg2 is selecting a not supported speculation misfeature ++======= ================================================================= ++ ++PR_SET_SPECULATION_CTRL error codes ++----------------------------------- ++======= ================================================================= ++Value Meaning ++======= ================================================================= ++0 Success ++ ++ERANGE arg3 is incorrect, i.e. it's neither PR_SPEC_ENABLE nor ++ PR_SPEC_DISABLE ++ ++ENXIO Control of the selected speculation misfeature is not possible. ++ See PR_GET_SPECULATION_CTRL. ++======= ================================================================= ++ ++Speculation misfeature controls ++------------------------------- ++- PR_SPEC_STORE_BYPASS: Speculative Store Bypass ++ ++ Invocations: ++ * prctl(PR_GET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, 0, 0, 0); ++ * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_ENABLE, 0, 0); ++ * prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0); +--- a/include/linux/nospec.h ++++ b/include/linux/nospec.h +@@ -55,4 +55,9 @@ static inline unsigned long array_index_ + \ + (typeof(_i)) (_i & _mask); \ + }) ++ ++/* Speculation control prctl */ ++int arch_prctl_spec_ctrl_get(unsigned long which); ++int arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl); ++ + #endif /* _LINUX_NOSPEC_H */ +--- a/include/uapi/linux/prctl.h ++++ b/include/uapi/linux/prctl.h +@@ -207,4 +207,15 @@ struct prctl_mm_map { + # define PR_SVE_VL_LEN_MASK 0xffff + # define PR_SVE_VL_INHERIT (1 << 17) /* inherit across exec */ + ++/* Per task speculation control */ ++#define PR_GET_SPECULATION_CTRL 52 ++#define PR_SET_SPECULATION_CTRL 53 ++/* Speculation control variants */ ++# define PR_SPEC_STORE_BYPASS 0 ++/* Return and control values for PR_SET/GET_SPECULATION_CTRL */ ++# define PR_SPEC_NOT_AFFECTED 0 ++# define PR_SPEC_PRCTL (1UL << 0) ++# define PR_SPEC_ENABLE (1UL << 1) ++# define PR_SPEC_DISABLE (1UL << 2) ++ + #endif /* _LINUX_PRCTL_H */ +--- a/kernel/sys.c ++++ b/kernel/sys.c +@@ -61,6 +61,8 @@ + #include + #include + ++#include ++ + #include + /* Move somewhere else to avoid recompiling? */ + #include +@@ -2190,6 +2192,16 @@ static int propagate_has_child_subreaper + return 1; + } + ++int __weak arch_prctl_spec_ctrl_get(unsigned long which) ++{ ++ return -EINVAL; ++} ++ ++int __weak arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl) ++{ ++ return -EINVAL; ++} ++ + SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, + unsigned long, arg4, unsigned long, arg5) + { +@@ -2398,6 +2410,16 @@ SYSCALL_DEFINE5(prctl, int, option, unsi + case PR_SVE_GET_VL: + error = SVE_GET_VL(); + break; ++ case PR_GET_SPECULATION_CTRL: ++ if (arg3 || arg4 || arg5) ++ return -EINVAL; ++ error = arch_prctl_spec_ctrl_get(arg2); ++ break; ++ case PR_SET_SPECULATION_CTRL: ++ if (arg4 || arg5) ++ return -EINVAL; ++ error = arch_prctl_spec_ctrl_set(arg2, arg3); ++ break; + default: + error = -EINVAL; + break; diff --git a/debian/patches/bugfix/x86/ssb/proc-provide-details-on-speculation-flaw-mitigations.patch b/debian/patches/bugfix/x86/ssb/proc-provide-details-on-speculation-flaw-mitigations.patch new file mode 100644 index 000000000..898ae2b04 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/proc-provide-details-on-speculation-flaw-mitigations.patch @@ -0,0 +1,57 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Kees Cook +Date: Tue, 1 May 2018 15:31:45 -0700 +Subject: proc: Provide details on speculation flaw mitigations + +From: Kees Cook + +commit fae1fa0fc6cca8beee3ab8ed71d54f9a78fa3f64 upstream + +As done with seccomp and no_new_privs, also show speculation flaw +mitigation state in /proc/$pid/status. + +Signed-off-by: Kees Cook +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + fs/proc/array.c | 22 ++++++++++++++++++++++ + 1 file changed, 22 insertions(+) + +--- a/fs/proc/array.c ++++ b/fs/proc/array.c +@@ -85,6 +85,7 @@ + #include + #include + #include ++#include + #include + #include + #include +@@ -347,6 +348,27 @@ static inline void task_seccomp(struct s + #ifdef CONFIG_SECCOMP + seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); + #endif ++ seq_printf(m, "\nSpeculation Store Bypass:\t"); ++ switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { ++ case -EINVAL: ++ seq_printf(m, "unknown"); ++ break; ++ case PR_SPEC_NOT_AFFECTED: ++ seq_printf(m, "not vulnerable"); ++ break; ++ case PR_SPEC_PRCTL | PR_SPEC_DISABLE: ++ seq_printf(m, "thread mitigated"); ++ break; ++ case PR_SPEC_PRCTL | PR_SPEC_ENABLE: ++ seq_printf(m, "thread vulnerable"); ++ break; ++ case PR_SPEC_DISABLE: ++ seq_printf(m, "globally mitigated"); ++ break; ++ default: ++ seq_printf(m, "vulnerable"); ++ break; ++ } + seq_putc(m, '\n'); + } + diff --git a/debian/patches/bugfix/x86/ssb/proc-use-underscores-for-ssbd-in-status.patch b/debian/patches/bugfix/x86/ssb/proc-use-underscores-for-ssbd-in-status.patch new file mode 100644 index 000000000..aadf8aa33 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/proc-use-underscores-for-ssbd-in-status.patch @@ -0,0 +1,30 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 9 May 2018 21:41:38 +0200 +Subject: proc: Use underscores for SSBD in 'status' + +From: Konrad Rzeszutek Wilk + +commit e96f46ee8587607a828f783daa6eb5b44d25004d upstream + +The style for the 'status' file is CamelCase or this. _. + +Fixes: fae1fa0fc ("proc: Provide details on speculation flaw mitigations") +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + fs/proc/array.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/fs/proc/array.c ++++ b/fs/proc/array.c +@@ -348,7 +348,7 @@ static inline void task_seccomp(struct s + #ifdef CONFIG_SECCOMP + seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); + #endif +- seq_printf(m, "\nSpeculation Store Bypass:\t"); ++ seq_printf(m, "\nSpeculation_Store_Bypass:\t"); + switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { + case -EINVAL: + seq_printf(m, "unknown"); diff --git a/debian/patches/bugfix/x86/ssb/seccomp-add-filter-flag-to-opt-out-of-ssb-mitigation.patch b/debian/patches/bugfix/x86/ssb/seccomp-add-filter-flag-to-opt-out-of-ssb-mitigation.patch new file mode 100644 index 000000000..3ebe323c4 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/seccomp-add-filter-flag-to-opt-out-of-ssb-mitigation.patch @@ -0,0 +1,169 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Kees Cook +Date: Thu, 3 May 2018 14:56:12 -0700 +Subject: seccomp: Add filter flag to opt-out of SSB mitigation + +From: Kees Cook + +commit 00a02d0c502a06d15e07b857f8ff921e3e402675 upstream + +If a seccomp user is not interested in Speculative Store Bypass mitigation +by default, it can set the new SECCOMP_FILTER_FLAG_SPEC_ALLOW flag when +adding filters. + +Signed-off-by: Kees Cook +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + include/linux/seccomp.h | 5 +++-- + include/uapi/linux/seccomp.h | 5 +++-- + kernel/seccomp.c | 19 +++++++++++-------- + tools/testing/selftests/seccomp/seccomp_bpf.c | 22 +++++++++++++++++++--- + 4 files changed, 36 insertions(+), 15 deletions(-) + +--- a/include/linux/seccomp.h ++++ b/include/linux/seccomp.h +@@ -4,8 +4,9 @@ + + #include + +-#define SECCOMP_FILTER_FLAG_MASK (SECCOMP_FILTER_FLAG_TSYNC | \ +- SECCOMP_FILTER_FLAG_LOG) ++#define SECCOMP_FILTER_FLAG_MASK (SECCOMP_FILTER_FLAG_TSYNC | \ ++ SECCOMP_FILTER_FLAG_LOG | \ ++ SECCOMP_FILTER_FLAG_SPEC_ALLOW) + + #ifdef CONFIG_SECCOMP + +--- a/include/uapi/linux/seccomp.h ++++ b/include/uapi/linux/seccomp.h +@@ -17,8 +17,9 @@ + #define SECCOMP_GET_ACTION_AVAIL 2 + + /* Valid flags for SECCOMP_SET_MODE_FILTER */ +-#define SECCOMP_FILTER_FLAG_TSYNC 1 +-#define SECCOMP_FILTER_FLAG_LOG 2 ++#define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0) ++#define SECCOMP_FILTER_FLAG_LOG (1UL << 1) ++#define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2) + + /* + * All BPF programs must return a 32-bit value. +--- a/kernel/seccomp.c ++++ b/kernel/seccomp.c +@@ -243,7 +243,8 @@ static inline void spec_mitigate(struct + } + + static inline void seccomp_assign_mode(struct task_struct *task, +- unsigned long seccomp_mode) ++ unsigned long seccomp_mode, ++ unsigned long flags) + { + assert_spin_locked(&task->sighand->siglock); + +@@ -253,8 +254,9 @@ static inline void seccomp_assign_mode(s + * filter) is set. + */ + smp_mb__before_atomic(); +- /* Assume seccomp processes want speculation flaw mitigation. */ +- spec_mitigate(task, PR_SPEC_STORE_BYPASS); ++ /* Assume default seccomp processes want spec flaw mitigation. */ ++ if ((flags & SECCOMP_FILTER_FLAG_SPEC_ALLOW) == 0) ++ spec_mitigate(task, PR_SPEC_STORE_BYPASS); + set_tsk_thread_flag(task, TIF_SECCOMP); + } + +@@ -322,7 +324,7 @@ static inline pid_t seccomp_can_sync_thr + * without dropping the locks. + * + */ +-static inline void seccomp_sync_threads(void) ++static inline void seccomp_sync_threads(unsigned long flags) + { + struct task_struct *thread, *caller; + +@@ -363,7 +365,8 @@ static inline void seccomp_sync_threads( + * allow one thread to transition the other. + */ + if (thread->seccomp.mode == SECCOMP_MODE_DISABLED) +- seccomp_assign_mode(thread, SECCOMP_MODE_FILTER); ++ seccomp_assign_mode(thread, SECCOMP_MODE_FILTER, ++ flags); + } + } + +@@ -486,7 +489,7 @@ static long seccomp_attach_filter(unsign + + /* Now that the new filter is in place, synchronize to all threads. */ + if (flags & SECCOMP_FILTER_FLAG_TSYNC) +- seccomp_sync_threads(); ++ seccomp_sync_threads(flags); + + return 0; + } +@@ -835,7 +838,7 @@ static long seccomp_set_mode_strict(void + #ifdef TIF_NOTSC + disable_TSC(); + #endif +- seccomp_assign_mode(current, seccomp_mode); ++ seccomp_assign_mode(current, seccomp_mode, 0); + ret = 0; + + out: +@@ -893,7 +896,7 @@ static long seccomp_set_mode_filter(unsi + /* Do not free the successfully attached filter. */ + prepared = NULL; + +- seccomp_assign_mode(current, seccomp_mode); ++ seccomp_assign_mode(current, seccomp_mode, flags); + out: + spin_unlock_irq(¤t->sighand->siglock); + if (flags & SECCOMP_FILTER_FLAG_TSYNC) +--- a/tools/testing/selftests/seccomp/seccomp_bpf.c ++++ b/tools/testing/selftests/seccomp/seccomp_bpf.c +@@ -134,11 +134,15 @@ struct seccomp_data { + #endif + + #ifndef SECCOMP_FILTER_FLAG_TSYNC +-#define SECCOMP_FILTER_FLAG_TSYNC 1 ++#define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0) + #endif + + #ifndef SECCOMP_FILTER_FLAG_LOG +-#define SECCOMP_FILTER_FLAG_LOG 2 ++#define SECCOMP_FILTER_FLAG_LOG (1UL << 1) ++#endif ++ ++#ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW ++#define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2) + #endif + + #ifndef PTRACE_SECCOMP_GET_METADATA +@@ -2072,14 +2076,26 @@ TEST(seccomp_syscall_mode_lock) + TEST(detect_seccomp_filter_flags) + { + unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC, +- SECCOMP_FILTER_FLAG_LOG }; ++ SECCOMP_FILTER_FLAG_LOG, ++ SECCOMP_FILTER_FLAG_SPEC_ALLOW }; + unsigned int flag, all_flags; + int i; + long ret; + + /* Test detection of known-good filter flags */ + for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) { ++ int bits = 0; ++ + flag = flags[i]; ++ /* Make sure the flag is a single bit! */ ++ while (flag) { ++ if (flag & 0x1) ++ bits ++; ++ flag >>= 1; ++ } ++ ASSERT_EQ(1, bits); ++ flag = flags[i]; ++ + ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); + ASSERT_NE(ENOSYS, errno) { + TH_LOG("Kernel does not support seccomp syscall!"); diff --git a/debian/patches/bugfix/x86/ssb/seccomp-enable-speculation-flaw-mitigations.patch b/debian/patches/bugfix/x86/ssb/seccomp-enable-speculation-flaw-mitigations.patch new file mode 100644 index 000000000..08652a0ad --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/seccomp-enable-speculation-flaw-mitigations.patch @@ -0,0 +1,60 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Kees Cook +Date: Tue, 1 May 2018 15:07:31 -0700 +Subject: seccomp: Enable speculation flaw mitigations + +From: Kees Cook + +commit 5c3070890d06ff82eecb808d02d2ca39169533ef upstream + +When speculation flaw mitigations are opt-in (via prctl), using seccomp +will automatically opt-in to these protections, since using seccomp +indicates at least some level of sandboxing is desired. + +Signed-off-by: Kees Cook +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + kernel/seccomp.c | 17 +++++++++++++++++ + 1 file changed, 17 insertions(+) + +--- a/kernel/seccomp.c ++++ b/kernel/seccomp.c +@@ -19,6 +19,8 @@ + #include + #include + #include ++#include ++#include + #include + #include + #include +@@ -227,6 +229,19 @@ static inline bool seccomp_may_assign_mo + return true; + } + ++/* ++ * If a given speculation mitigation is opt-in (prctl()-controlled), ++ * select it, by disabling speculation (enabling mitigation). ++ */ ++static inline void spec_mitigate(struct task_struct *task, ++ unsigned long which) ++{ ++ int state = arch_prctl_spec_ctrl_get(task, which); ++ ++ if (state > 0 && (state & PR_SPEC_PRCTL)) ++ arch_prctl_spec_ctrl_set(task, which, PR_SPEC_DISABLE); ++} ++ + static inline void seccomp_assign_mode(struct task_struct *task, + unsigned long seccomp_mode) + { +@@ -238,6 +253,8 @@ static inline void seccomp_assign_mode(s + * filter) is set. + */ + smp_mb__before_atomic(); ++ /* Assume seccomp processes want speculation flaw mitigation. */ ++ spec_mitigate(task, PR_SPEC_STORE_BYPASS); + set_tsk_thread_flag(task, TIF_SECCOMP); + } + diff --git a/debian/patches/bugfix/x86/ssb/seccomp-move-speculation-migitation-control-to-arch-code.patch b/debian/patches/bugfix/x86/ssb/seccomp-move-speculation-migitation-control-to-arch-code.patch new file mode 100644 index 000000000..9aef76ec4 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/seccomp-move-speculation-migitation-control-to-arch-code.patch @@ -0,0 +1,112 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Fri, 4 May 2018 15:12:06 +0200 +Subject: seccomp: Move speculation migitation control to arch code + +From: Thomas Gleixner + +commit 8bf37d8c067bb7eb8e7c381bdadf9bd89182b6bc upstream + +The migitation control is simpler to implement in architecture code as it +avoids the extra function call to check the mode. Aside of that having an +explicit seccomp enabled mode in the architecture mitigations would require +even more workarounds. + +Move it into architecture code and provide a weak function in the seccomp +code. Remove the 'which' argument as this allows the architecture to decide +which mitigations are relevant for seccomp. + +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 29 ++++++++++++++++++----------- + include/linux/nospec.h | 2 ++ + kernel/seccomp.c | 15 ++------------- + 3 files changed, 22 insertions(+), 24 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -569,6 +569,24 @@ static int ssb_prctl_set(struct task_str + return 0; + } + ++int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, ++ unsigned long ctrl) ++{ ++ switch (which) { ++ case PR_SPEC_STORE_BYPASS: ++ return ssb_prctl_set(task, ctrl); ++ default: ++ return -ENODEV; ++ } ++} ++ ++#ifdef CONFIG_SECCOMP ++void arch_seccomp_spec_mitigate(struct task_struct *task) ++{ ++ ssb_prctl_set(task, PR_SPEC_FORCE_DISABLE); ++} ++#endif ++ + static int ssb_prctl_get(struct task_struct *task) + { + switch (ssb_mode) { +@@ -587,17 +605,6 @@ static int ssb_prctl_get(struct task_str + } + } + +-int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, +- unsigned long ctrl) +-{ +- switch (which) { +- case PR_SPEC_STORE_BYPASS: +- return ssb_prctl_set(task, ctrl); +- default: +- return -ENODEV; +- } +-} +- + int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which) + { + switch (which) { +--- a/include/linux/nospec.h ++++ b/include/linux/nospec.h +@@ -62,5 +62,7 @@ static inline unsigned long array_index_ + int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which); + int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which, + unsigned long ctrl); ++/* Speculation control for seccomp enforced mitigation */ ++void arch_seccomp_spec_mitigate(struct task_struct *task); + + #endif /* _LINUX_NOSPEC_H */ +--- a/kernel/seccomp.c ++++ b/kernel/seccomp.c +@@ -229,18 +229,7 @@ static inline bool seccomp_may_assign_mo + return true; + } + +-/* +- * If a given speculation mitigation is opt-in (prctl()-controlled), +- * select it, by disabling speculation (enabling mitigation). +- */ +-static inline void spec_mitigate(struct task_struct *task, +- unsigned long which) +-{ +- int state = arch_prctl_spec_ctrl_get(task, which); +- +- if (state > 0 && (state & PR_SPEC_PRCTL)) +- arch_prctl_spec_ctrl_set(task, which, PR_SPEC_FORCE_DISABLE); +-} ++void __weak arch_seccomp_spec_mitigate(struct task_struct *task) { } + + static inline void seccomp_assign_mode(struct task_struct *task, + unsigned long seccomp_mode, +@@ -256,7 +245,7 @@ static inline void seccomp_assign_mode(s + smp_mb__before_atomic(); + /* Assume default seccomp processes want spec flaw mitigation. */ + if ((flags & SECCOMP_FILTER_FLAG_SPEC_ALLOW) == 0) +- spec_mitigate(task, PR_SPEC_STORE_BYPASS); ++ arch_seccomp_spec_mitigate(task); + set_tsk_thread_flag(task, TIF_SECCOMP); + } + diff --git a/debian/patches/bugfix/x86/ssb/seccomp-use-pr_spec_force_disable.patch b/debian/patches/bugfix/x86/ssb/seccomp-use-pr_spec_force_disable.patch new file mode 100644 index 000000000..9a1c8bf27 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/seccomp-use-pr_spec_force_disable.patch @@ -0,0 +1,29 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Fri, 4 May 2018 09:40:03 +0200 +Subject: seccomp: Use PR_SPEC_FORCE_DISABLE + +From: Thomas Gleixner + +commit b849a812f7eb92e96d1c8239b06581b2cfd8b275 upstream + +Use PR_SPEC_FORCE_DISABLE in seccomp() because seccomp does not allow to +widen restrictions. + +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + kernel/seccomp.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/kernel/seccomp.c ++++ b/kernel/seccomp.c +@@ -239,7 +239,7 @@ static inline void spec_mitigate(struct + int state = arch_prctl_spec_ctrl_get(task, which); + + if (state > 0 && (state & PR_SPEC_PRCTL)) +- arch_prctl_spec_ctrl_set(task, which, PR_SPEC_DISABLE); ++ arch_prctl_spec_ctrl_set(task, which, PR_SPEC_FORCE_DISABLE); + } + + static inline void seccomp_assign_mode(struct task_struct *task, diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-amd-add-support-to-disable-rds-on-famh-if-requested.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-amd-add-support-to-disable-rds-on-famh-if-requested.patch new file mode 100644 index 000000000..6015bb5cc --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-amd-add-support-to-disable-rds-on-famh-if-requested.patch @@ -0,0 +1,187 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:24 -0400 +Subject: x86/bugs/AMD: Add support to disable RDS on Fam[15,16,17]h if requested + +From: Konrad Rzeszutek Wilk + +commit 764f3c21588a059cd783c6ba0734d4db2d72822d upstream + +AMD does not need the Speculative Store Bypass mitigation to be enabled. + +The parameters for this are already available and can be done via MSR +C001_1020. Each family uses a different bit in that MSR for this. + +[ tglx: Expose the bit mask via a variable and move the actual MSR fiddling + into the bugs code as that's the right thing to do and also required + to prepare for dynamic enable/disable ] + +Suggested-by: Borislav Petkov +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 1 + + arch/x86/include/asm/nospec-branch.h | 4 ++++ + arch/x86/kernel/cpu/amd.c | 26 ++++++++++++++++++++++++++ + arch/x86/kernel/cpu/bugs.c | 27 ++++++++++++++++++++++++++- + arch/x86/kernel/cpu/common.c | 4 ++++ + 5 files changed, 61 insertions(+), 1 deletion(-) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -215,6 +215,7 @@ + #define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */ + #define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */ + #define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */ ++#define X86_FEATURE_AMD_RDS (7*32+24) /* "" AMD RDS implementation */ + + /* Virtualization flags: Linux defined, word 8 */ + #define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */ +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -244,6 +244,10 @@ enum ssb_mitigation { + SPEC_STORE_BYPASS_DISABLE, + }; + ++/* AMD specific Speculative Store Bypass MSR data */ ++extern u64 x86_amd_ls_cfg_base; ++extern u64 x86_amd_ls_cfg_rds_mask; ++ + extern char __indirect_thunk_start[]; + extern char __indirect_thunk_end[]; + +--- a/arch/x86/kernel/cpu/amd.c ++++ b/arch/x86/kernel/cpu/amd.c +@@ -10,6 +10,7 @@ + #include + #include + #include ++#include + #include + #include + #include +@@ -554,6 +555,26 @@ static void bsp_init_amd(struct cpuinfo_ + rdmsrl(MSR_FAM10H_NODE_ID, value); + nodes_per_socket = ((value >> 3) & 7) + 1; + } ++ ++ if (c->x86 >= 0x15 && c->x86 <= 0x17) { ++ unsigned int bit; ++ ++ switch (c->x86) { ++ case 0x15: bit = 54; break; ++ case 0x16: bit = 33; break; ++ case 0x17: bit = 10; break; ++ default: return; ++ } ++ /* ++ * Try to cache the base value so further operations can ++ * avoid RMW. If that faults, do not enable RDS. ++ */ ++ if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) { ++ setup_force_cpu_cap(X86_FEATURE_RDS); ++ setup_force_cpu_cap(X86_FEATURE_AMD_RDS); ++ x86_amd_ls_cfg_rds_mask = 1ULL << bit; ++ } ++ } + } + + static void early_detect_mem_encrypt(struct cpuinfo_x86 *c) +@@ -898,6 +919,11 @@ static void init_amd(struct cpuinfo_x86 + /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */ + if (!cpu_has(c, X86_FEATURE_XENPV)) + set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); ++ ++ if (boot_cpu_has(X86_FEATURE_AMD_RDS)) { ++ set_cpu_cap(c, X86_FEATURE_RDS); ++ set_cpu_cap(c, X86_FEATURE_AMD_RDS); ++ } + } + + #ifdef CONFIG_X86_32 +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -41,6 +41,13 @@ static u64 __ro_after_init x86_spec_ctrl + */ + static u64 __ro_after_init x86_spec_ctrl_mask = ~SPEC_CTRL_IBRS; + ++/* ++ * AMD specific MSR info for Speculative Store Bypass control. ++ * x86_amd_ls_cfg_rds_mask is initialized in identify_boot_cpu(). ++ */ ++u64 __ro_after_init x86_amd_ls_cfg_base; ++u64 __ro_after_init x86_amd_ls_cfg_rds_mask; ++ + void __init check_bugs(void) + { + identify_boot_cpu(); +@@ -52,7 +59,8 @@ void __init check_bugs(void) + + /* + * Read the SPEC_CTRL MSR to account for reserved bits which may +- * have unknown values. ++ * have unknown values. AMD64_LS_CFG MSR is cached in the early AMD ++ * init code as it is not enumerated and depends on the family. + */ + if (boot_cpu_has(X86_FEATURE_IBRS)) + rdmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); +@@ -154,6 +162,14 @@ void x86_spec_ctrl_restore_host(u64 gues + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); + ++static void x86_amd_rds_enable(void) ++{ ++ u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_rds_mask; ++ ++ if (boot_cpu_has(X86_FEATURE_AMD_RDS)) ++ wrmsrl(MSR_AMD64_LS_CFG, msrval); ++} ++ + #ifdef RETPOLINE + static bool spectre_v2_bad_module; + +@@ -443,6 +459,11 @@ static enum ssb_mitigation_cmd __init __ + + switch (cmd) { + case SPEC_STORE_BYPASS_CMD_AUTO: ++ /* ++ * AMD platforms by default don't need SSB mitigation. ++ */ ++ if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) ++ break; + case SPEC_STORE_BYPASS_CMD_ON: + mode = SPEC_STORE_BYPASS_DISABLE; + break; +@@ -469,6 +490,7 @@ static enum ssb_mitigation_cmd __init __ + x86_spec_ctrl_set(SPEC_CTRL_RDS); + break; + case X86_VENDOR_AMD: ++ x86_amd_rds_enable(); + break; + } + } +@@ -490,6 +512,9 @@ void x86_spec_ctrl_setup_ap(void) + { + if (boot_cpu_has(X86_FEATURE_IBRS)) + x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask); ++ ++ if (ssb_mode == SPEC_STORE_BYPASS_DISABLE) ++ x86_amd_rds_enable(); + } + + #ifdef CONFIG_SYSFS +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -934,6 +934,10 @@ static const __initconst struct x86_cpu_ + { X86_VENDOR_CENTAUR, 5, }, + { X86_VENDOR_INTEL, 5, }, + { X86_VENDOR_NSC, 5, }, ++ { X86_VENDOR_AMD, 0x12, }, ++ { X86_VENDOR_AMD, 0x11, }, ++ { X86_VENDOR_AMD, 0x10, }, ++ { X86_VENDOR_AMD, 0xf, }, + { X86_VENDOR_ANY, 4, }, + {} + }; diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-concentrate-bug-detection-into-a-separate-function.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-concentrate-bug-detection-into-a-separate-function.patch new file mode 100644 index 000000000..8177fd8de --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-concentrate-bug-detection-into-a-separate-function.patch @@ -0,0 +1,70 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:16 -0400 +Subject: x86/bugs: Concentrate bug detection into a separate function + +From: Konrad Rzeszutek Wilk + +commit 4a28bfe3267b68e22c663ac26185aa16c9b879ef upstream + +Combine the various logic which goes through all those +x86_cpu_id matching structures in one function. + +Suggested-by: Borislav Petkov +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/common.c | 21 +++++++++++---------- + 1 file changed, 11 insertions(+), 10 deletions(-) + +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -918,21 +918,27 @@ static const __initconst struct x86_cpu_ + {} + }; + +-static bool __init cpu_vulnerable_to_meltdown(struct cpuinfo_x86 *c) ++static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c) + { + u64 ia32_cap = 0; + ++ if (x86_match_cpu(cpu_no_speculation)) ++ return; ++ ++ setup_force_cpu_bug(X86_BUG_SPECTRE_V1); ++ setup_force_cpu_bug(X86_BUG_SPECTRE_V2); ++ + if (x86_match_cpu(cpu_no_meltdown)) +- return false; ++ return; + + if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES)) + rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); + + /* Rogue Data Cache Load? No! */ + if (ia32_cap & ARCH_CAP_RDCL_NO) +- return false; ++ return; + +- return true; ++ setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN); + } + + /* +@@ -982,12 +988,7 @@ static void __init early_identify_cpu(st + + setup_force_cpu_cap(X86_FEATURE_ALWAYS); + +- if (!x86_match_cpu(cpu_no_speculation)) { +- if (cpu_vulnerable_to_meltdown(c)) +- setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN); +- setup_force_cpu_bug(X86_BUG_SPECTRE_V1); +- setup_force_cpu_bug(X86_BUG_SPECTRE_V2); +- } ++ cpu_set_bug_bits(c); + + fpu__init_system(c); + diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-concentrate-bug-reporting-into-a-separate-function.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-concentrate-bug-reporting-into-a-separate-function.patch new file mode 100644 index 000000000..102e5341e --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-concentrate-bug-reporting-into-a-separate-function.patch @@ -0,0 +1,87 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:17 -0400 +Subject: x86/bugs: Concentrate bug reporting into a separate function + +From: Konrad Rzeszutek Wilk + +commit d1059518b4789cabe34bb4b714d07e6089c82ca1 upstream + +Those SysFS functions have a similar preamble, as such make common +code to handle them. + +Suggested-by: Borislav Petkov +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 46 +++++++++++++++++++++++++++++++-------------- + 1 file changed, 32 insertions(+), 14 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -314,30 +314,48 @@ retpoline_auto: + #undef pr_fmt + + #ifdef CONFIG_SYSFS +-ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf) ++ ++ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr, ++ char *buf, unsigned int bug) + { +- if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) ++ if (!boot_cpu_has_bug(bug)) + return sprintf(buf, "Not affected\n"); +- if (boot_cpu_has(X86_FEATURE_PTI)) +- return sprintf(buf, "Mitigation: PTI\n"); ++ ++ switch (bug) { ++ case X86_BUG_CPU_MELTDOWN: ++ if (boot_cpu_has(X86_FEATURE_PTI)) ++ return sprintf(buf, "Mitigation: PTI\n"); ++ ++ break; ++ ++ case X86_BUG_SPECTRE_V1: ++ return sprintf(buf, "Mitigation: __user pointer sanitization\n"); ++ ++ case X86_BUG_SPECTRE_V2: ++ return sprintf(buf, "%s%s%s%s\n", spectre_v2_strings[spectre_v2_enabled], ++ boot_cpu_has(X86_FEATURE_USE_IBPB) ? ", IBPB" : "", ++ boot_cpu_has(X86_FEATURE_USE_IBRS_FW) ? ", IBRS_FW" : "", ++ spectre_v2_module_string()); ++ ++ default: ++ break; ++ } ++ + return sprintf(buf, "Vulnerable\n"); + } + ++ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf) ++{ ++ return cpu_show_common(dev, attr, buf, X86_BUG_CPU_MELTDOWN); ++} ++ + ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf) + { +- if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1)) +- return sprintf(buf, "Not affected\n"); +- return sprintf(buf, "Mitigation: __user pointer sanitization\n"); ++ return cpu_show_common(dev, attr, buf, X86_BUG_SPECTRE_V1); + } + + ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, char *buf) + { +- if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2)) +- return sprintf(buf, "Not affected\n"); +- +- return sprintf(buf, "%s%s%s%s\n", spectre_v2_strings[spectre_v2_enabled], +- boot_cpu_has(X86_FEATURE_USE_IBPB) ? ", IBPB" : "", +- boot_cpu_has(X86_FEATURE_USE_IBRS_FW) ? ", IBRS_FW" : "", +- spectre_v2_module_string()); ++ return cpu_show_common(dev, attr, buf, X86_BUG_SPECTRE_V2); + } + #endif diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-expose-sys-..-spec_store_bypass.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-expose-sys-..-spec_store_bypass.patch new file mode 100644 index 000000000..e7be600b3 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-expose-sys-..-spec_store_bypass.patch @@ -0,0 +1,134 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:20 -0400 +Subject: x86/bugs: Expose /sys/../spec_store_bypass + +From: Konrad Rzeszutek Wilk + +commit c456442cd3a59eeb1d60293c26cbe2ff2c4e42cf upstream + +Add the sysfs file for the new vulerability. It does not do much except +show the words 'Vulnerable' for recent x86 cores. + +Intel cores prior to family 6 are known not to be vulnerable, and so are +some Atoms and some Xeon Phi. + +It assumes that older Cyrix, Centaur, etc. cores are immune. + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/ABI/testing/sysfs-devices-system-cpu | 1 + arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kernel/cpu/bugs.c | 5 ++++ + arch/x86/kernel/cpu/common.c | 23 +++++++++++++++++++++ + drivers/base/cpu.c | 8 +++++++ + include/linux/cpu.h | 2 + + 6 files changed, 40 insertions(+) + +--- a/Documentation/ABI/testing/sysfs-devices-system-cpu ++++ b/Documentation/ABI/testing/sysfs-devices-system-cpu +@@ -453,6 +453,7 @@ What: /sys/devices/system/cpu/vulnerabi + /sys/devices/system/cpu/vulnerabilities/meltdown + /sys/devices/system/cpu/vulnerabilities/spectre_v1 + /sys/devices/system/cpu/vulnerabilities/spectre_v2 ++ /sys/devices/system/cpu/vulnerabilities/spec_store_bypass + Date: January 2018 + Contact: Linux kernel mailing list + Description: Information about CPU vulnerabilities +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -362,5 +362,6 @@ + #define X86_BUG_CPU_MELTDOWN X86_BUG(14) /* CPU is affected by meltdown attack and needs kernel page table isolation */ + #define X86_BUG_SPECTRE_V1 X86_BUG(15) /* CPU is affected by Spectre variant 1 attack with conditional branches */ + #define X86_BUG_SPECTRE_V2 X86_BUG(16) /* CPU is affected by Spectre variant 2 attack with indirect branches */ ++#define X86_BUG_SPEC_STORE_BYPASS X86_BUG(17) /* CPU is affected by speculative store bypass attack */ + + #endif /* _ASM_X86_CPUFEATURES_H */ +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -404,4 +404,9 @@ ssize_t cpu_show_spectre_v2(struct devic + { + return cpu_show_common(dev, attr, buf, X86_BUG_SPECTRE_V2); + } ++ ++ssize_t cpu_show_spec_store_bypass(struct device *dev, struct device_attribute *attr, char *buf) ++{ ++ return cpu_show_common(dev, attr, buf, X86_BUG_SPEC_STORE_BYPASS); ++} + #endif +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -918,10 +918,33 @@ static const __initconst struct x86_cpu_ + {} + }; + ++static const __initconst struct x86_cpu_id cpu_no_spec_store_bypass[] = { ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PINEVIEW }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_LINCROFT }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PENWELL }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CLOVERVIEW }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CEDARVIEW }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT1 }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_AIRMONT }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT2 }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_MERRIFIELD }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_CORE_YONAH }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_XEON_PHI_KNL }, ++ { X86_VENDOR_INTEL, 6, INTEL_FAM6_XEON_PHI_KNM }, ++ { X86_VENDOR_CENTAUR, 5, }, ++ { X86_VENDOR_INTEL, 5, }, ++ { X86_VENDOR_NSC, 5, }, ++ { X86_VENDOR_ANY, 4, }, ++ {} ++}; ++ + static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c) + { + u64 ia32_cap = 0; + ++ if (!x86_match_cpu(cpu_no_spec_store_bypass)) ++ setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS); ++ + if (x86_match_cpu(cpu_no_speculation)) + return; + +--- a/drivers/base/cpu.c ++++ b/drivers/base/cpu.c +@@ -532,14 +532,22 @@ ssize_t __weak cpu_show_spectre_v2(struc + return sprintf(buf, "Not affected\n"); + } + ++ssize_t __weak cpu_show_spec_store_bypass(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ return sprintf(buf, "Not affected\n"); ++} ++ + static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL); + static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL); + static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL); ++static DEVICE_ATTR(spec_store_bypass, 0444, cpu_show_spec_store_bypass, NULL); + + static struct attribute *cpu_root_vulnerabilities_attrs[] = { + &dev_attr_meltdown.attr, + &dev_attr_spectre_v1.attr, + &dev_attr_spectre_v2.attr, ++ &dev_attr_spec_store_bypass.attr, + NULL + }; + +--- a/include/linux/cpu.h ++++ b/include/linux/cpu.h +@@ -53,6 +53,8 @@ extern ssize_t cpu_show_spectre_v1(struc + struct device_attribute *attr, char *buf); + extern ssize_t cpu_show_spectre_v2(struct device *dev, + struct device_attribute *attr, char *buf); ++extern ssize_t cpu_show_spec_store_bypass(struct device *dev, ++ struct device_attribute *attr, char *buf); + + extern __printf(4, 5) + struct device *cpu_device_create(struct device *parent, void *drvdata, diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-expose-x86_spec_ctrl_base-directly.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-expose-x86_spec_ctrl_base-directly.patch new file mode 100644 index 000000000..ded599d26 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-expose-x86_spec_ctrl_base-directly.patch @@ -0,0 +1,112 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sat, 12 May 2018 20:49:16 +0200 +Subject: x86/bugs: Expose x86_spec_ctrl_base directly + +From: Thomas Gleixner + +commit fa8ac4988249c38476f6ad678a4848a736373403 upstream + +x86_spec_ctrl_base is the system wide default value for the SPEC_CTRL MSR. +x86_spec_ctrl_get_default() returns x86_spec_ctrl_base and was intended to +prevent modification to that variable. Though the variable is read only +after init and globaly visible already. + +Remove the function and export the variable instead. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 16 +++++----------- + arch/x86/include/asm/spec-ctrl.h | 3 --- + arch/x86/kernel/cpu/bugs.c | 11 +---------- + 3 files changed, 6 insertions(+), 24 deletions(-) + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -217,16 +217,7 @@ enum spectre_v2_mitigation { + SPECTRE_V2_IBRS, + }; + +-/* +- * The Intel specification for the SPEC_CTRL MSR requires that we +- * preserve any already set reserved bits at boot time (e.g. for +- * future additions that this kernel is not currently aware of). +- * We then set any additional mitigation bits that we want +- * ourselves and always use this as the base for SPEC_CTRL. +- * We also use this when handling guest entry/exit as below. +- */ + extern void x86_spec_ctrl_set(u64); +-extern u64 x86_spec_ctrl_get_default(void); + + /* The Speculative Store Bypass disable variants */ + enum ssb_mitigation { +@@ -278,6 +269,9 @@ static inline void indirect_branch_predi + alternative_msr_write(MSR_IA32_PRED_CMD, val, X86_FEATURE_USE_IBPB); + } + ++/* The Intel SPEC CTRL MSR base value cache */ ++extern u64 x86_spec_ctrl_base; ++ + /* + * With retpoline, we must use IBRS to restrict branch prediction + * before calling into firmware. +@@ -286,7 +280,7 @@ static inline void indirect_branch_predi + */ + #define firmware_restrict_branch_speculation_start() \ + do { \ +- u64 val = x86_spec_ctrl_get_default() | SPEC_CTRL_IBRS; \ ++ u64 val = x86_spec_ctrl_base | SPEC_CTRL_IBRS; \ + \ + preempt_disable(); \ + alternative_msr_write(MSR_IA32_SPEC_CTRL, val, \ +@@ -295,7 +289,7 @@ do { \ + + #define firmware_restrict_branch_speculation_end() \ + do { \ +- u64 val = x86_spec_ctrl_get_default(); \ ++ u64 val = x86_spec_ctrl_base; \ + \ + alternative_msr_write(MSR_IA32_SPEC_CTRL, val, \ + X86_FEATURE_USE_IBRS_FW); \ +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -47,9 +47,6 @@ void x86_spec_ctrl_restore_host(u64 gues + extern u64 x86_amd_ls_cfg_base; + extern u64 x86_amd_ls_cfg_ssbd_mask; + +-/* The Intel SPEC CTRL MSR base value cache */ +-extern u64 x86_spec_ctrl_base; +- + static inline u64 ssbd_tif_to_spec_ctrl(u64 tifn) + { + BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -36,6 +36,7 @@ static void __init ssb_select_mitigation + * writes to SPEC_CTRL contain whatever reserved bits have been set. + */ + u64 __ro_after_init x86_spec_ctrl_base; ++EXPORT_SYMBOL_GPL(x86_spec_ctrl_base); + + /* + * The vendor and possibly platform specific bits which can be modified in +@@ -141,16 +142,6 @@ void x86_spec_ctrl_set(u64 val) + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_set); + +-u64 x86_spec_ctrl_get_default(void) +-{ +- u64 msrval = x86_spec_ctrl_base; +- +- if (static_cpu_has(X86_FEATURE_SPEC_CTRL)) +- msrval |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); +- return msrval; +-} +-EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); +- + void + x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest) + { diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-fix-__ssb_select_mitigation-return-type.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-fix-__ssb_select_mitigation-return-type.patch new file mode 100644 index 000000000..bf9c432b5 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-fix-__ssb_select_mitigation-return-type.patch @@ -0,0 +1,31 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Jiri Kosina +Date: Thu, 10 May 2018 22:47:18 +0200 +Subject: x86/bugs: Fix __ssb_select_mitigation() return type + +From: Jiri Kosina + +commit d66d8ff3d21667b41eddbe86b35ab411e40d8c5f upstream + +__ssb_select_mitigation() returns one of the members of enum ssb_mitigation, +not ssb_mitigation_cmd; fix the prototype to reflect that. + +Fixes: 24f7fc83b9204 ("x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation") +Signed-off-by: Jiri Kosina +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -468,7 +468,7 @@ static enum ssb_mitigation_cmd __init ss + return cmd; + } + +-static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void) ++static enum ssb_mitigation __init __ssb_select_mitigation(void) + { + enum ssb_mitigation mode = SPEC_STORE_BYPASS_NONE; + enum ssb_mitigation_cmd cmd; diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-fix-the-parameters-alignment-and-missing-void.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-fix-the-parameters-alignment-and-missing-void.patch new file mode 100644 index 000000000..a23781536 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-fix-the-parameters-alignment-and-missing-void.patch @@ -0,0 +1,38 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Fri, 11 May 2018 16:50:35 -0400 +Subject: x86/bugs: Fix the parameters alignment and missing void + +From: Konrad Rzeszutek Wilk + +commit ffed645e3be0e32f8e9ab068d257aee8d0fe8eec upstream + +Fixes: 7bb4d366c ("x86/bugs: Make cpu_show_common() static") +Fixes: 24f7fc83b ("x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation") +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -531,7 +531,7 @@ static enum ssb_mitigation __init __ssb_ + return mode; + } + +-static void ssb_select_mitigation() ++static void ssb_select_mitigation(void) + { + ssb_mode = __ssb_select_mitigation(); + +@@ -641,7 +641,7 @@ void x86_spec_ctrl_setup_ap(void) + #ifdef CONFIG_SYSFS + + static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr, +- char *buf, unsigned int bug) ++ char *buf, unsigned int bug) + { + if (!boot_cpu_has_bug(bug)) + return sprintf(buf, "Not affected\n"); diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-intel-set-proper-cpu-features-and-setup-rds.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-intel-set-proper-cpu-features-and-setup-rds.patch new file mode 100644 index 000000000..6425b94a8 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-intel-set-proper-cpu-features-and-setup-rds.patch @@ -0,0 +1,170 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:22 -0400 +Subject: x86/bugs/intel: Set proper CPU features and setup RDS + +From: Konrad Rzeszutek Wilk + +commit 772439717dbf703b39990be58d8d4e3e4ad0598a upstream + +Intel CPUs expose methods to: + + - Detect whether RDS capability is available via CPUID.7.0.EDX[31], + + - The SPEC_CTRL MSR(0x48), bit 2 set to enable RDS. + + - MSR_IA32_ARCH_CAPABILITIES, Bit(4) no need to enable RRS. + +With that in mind if spec_store_bypass_disable=[auto,on] is selected set at +boot-time the SPEC_CTRL MSR to enable RDS if the platform requires it. + +Note that this does not fix the KVM case where the SPEC_CTRL is exposed to +guests which can muck with it, see patch titled : + KVM/SVM/VMX/x86/spectre_v2: Support the combination of guest and host IBRS. + +And for the firmware (IBRS to be set), see patch titled: + x86/spectre_v2: Read SPEC_CTRL MSR during boot and re-use reserved bits + +[ tglx: Distangled it from the intel implementation and kept the call order ] + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/msr-index.h | 6 ++++++ + arch/x86/kernel/cpu/bugs.c | 30 ++++++++++++++++++++++++++++-- + arch/x86/kernel/cpu/common.c | 10 ++++++---- + arch/x86/kernel/cpu/cpu.h | 2 ++ + arch/x86/kernel/cpu/intel.c | 1 + + 5 files changed, 43 insertions(+), 6 deletions(-) + +--- a/arch/x86/include/asm/msr-index.h ++++ b/arch/x86/include/asm/msr-index.h +@@ -42,6 +42,7 @@ + #define MSR_IA32_SPEC_CTRL 0x00000048 /* Speculation Control */ + #define SPEC_CTRL_IBRS (1 << 0) /* Indirect Branch Restricted Speculation */ + #define SPEC_CTRL_STIBP (1 << 1) /* Single Thread Indirect Branch Predictors */ ++#define SPEC_CTRL_RDS (1 << 2) /* Reduced Data Speculation */ + + #define MSR_IA32_PRED_CMD 0x00000049 /* Prediction Command */ + #define PRED_CMD_IBPB (1 << 0) /* Indirect Branch Prediction Barrier */ +@@ -68,6 +69,11 @@ + #define MSR_IA32_ARCH_CAPABILITIES 0x0000010a + #define ARCH_CAP_RDCL_NO (1 << 0) /* Not susceptible to Meltdown */ + #define ARCH_CAP_IBRS_ALL (1 << 1) /* Enhanced IBRS support */ ++#define ARCH_CAP_RDS_NO (1 << 4) /* ++ * Not susceptible to Speculative Store Bypass ++ * attack, so no Reduced Data Speculation control ++ * required. ++ */ + + #define MSR_IA32_BBL_CR_CTL 0x00000119 + #define MSR_IA32_BBL_CR_CTL3 0x0000011e +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -117,7 +117,7 @@ static enum spectre_v2_mitigation spectr + + void x86_spec_ctrl_set(u64 val) + { +- if (val & ~SPEC_CTRL_IBRS) ++ if (val & ~(SPEC_CTRL_IBRS | SPEC_CTRL_RDS)) + WARN_ONCE(1, "SPEC_CTRL MSR value 0x%16llx is unknown.\n", val); + else + wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base | val); +@@ -444,8 +444,28 @@ static enum ssb_mitigation_cmd __init __ + break; + } + +- if (mode != SPEC_STORE_BYPASS_NONE) ++ /* ++ * We have three CPU feature flags that are in play here: ++ * - X86_BUG_SPEC_STORE_BYPASS - CPU is susceptible. ++ * - X86_FEATURE_RDS - CPU is able to turn off speculative store bypass ++ * - X86_FEATURE_SPEC_STORE_BYPASS_DISABLE - engage the mitigation ++ */ ++ if (mode != SPEC_STORE_BYPASS_NONE) { + setup_force_cpu_cap(X86_FEATURE_SPEC_STORE_BYPASS_DISABLE); ++ /* ++ * Intel uses the SPEC CTRL MSR Bit(2) for this, while AMD uses ++ * a completely different MSR and bit dependent on family. ++ */ ++ switch (boot_cpu_data.x86_vendor) { ++ case X86_VENDOR_INTEL: ++ x86_spec_ctrl_base |= SPEC_CTRL_RDS; ++ x86_spec_ctrl_set(SPEC_CTRL_RDS); ++ break; ++ case X86_VENDOR_AMD: ++ break; ++ } ++ } ++ + return mode; + } + +@@ -459,6 +479,12 @@ static void ssb_select_mitigation() + + #undef pr_fmt + ++void x86_spec_ctrl_setup_ap(void) ++{ ++ if (boot_cpu_has(X86_FEATURE_IBRS)) ++ x86_spec_ctrl_set(x86_spec_ctrl_base & (SPEC_CTRL_IBRS | SPEC_CTRL_RDS)); ++} ++ + #ifdef CONFIG_SYSFS + + ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr, +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -942,7 +942,11 @@ static void __init cpu_set_bug_bits(stru + { + u64 ia32_cap = 0; + +- if (!x86_match_cpu(cpu_no_spec_store_bypass)) ++ if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES)) ++ rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); ++ ++ if (!x86_match_cpu(cpu_no_spec_store_bypass) && ++ !(ia32_cap & ARCH_CAP_RDS_NO)) + setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS); + + if (x86_match_cpu(cpu_no_speculation)) +@@ -954,9 +958,6 @@ static void __init cpu_set_bug_bits(stru + if (x86_match_cpu(cpu_no_meltdown)) + return; + +- if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES)) +- rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); +- + /* Rogue Data Cache Load? No! */ + if (ia32_cap & ARCH_CAP_RDCL_NO) + return; +@@ -1371,6 +1372,7 @@ void identify_secondary_cpu(struct cpuin + #endif + mtrr_ap_init(); + validate_apic_and_package_id(c); ++ x86_spec_ctrl_setup_ap(); + } + + static __init int setup_noclflush(char *arg) +--- a/arch/x86/kernel/cpu/cpu.h ++++ b/arch/x86/kernel/cpu/cpu.h +@@ -50,4 +50,6 @@ extern void cpu_detect_cache_sizes(struc + + unsigned int aperfmperf_get_khz(int cpu); + ++extern void x86_spec_ctrl_setup_ap(void); ++ + #endif /* ARCH_X86_CPU_H */ +--- a/arch/x86/kernel/cpu/intel.c ++++ b/arch/x86/kernel/cpu/intel.c +@@ -189,6 +189,7 @@ static void early_init_intel(struct cpui + setup_clear_cpu_cap(X86_FEATURE_STIBP); + setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL); + setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP); ++ setup_clear_cpu_cap(X86_FEATURE_RDS); + } + + /* diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-kvm-extend-speculation-control-for-virt_spec_ctrl.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-kvm-extend-speculation-control-for-virt_spec_ctrl.patch new file mode 100644 index 000000000..ce65bdb92 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-kvm-extend-speculation-control-for-virt_spec_ctrl.patch @@ -0,0 +1,152 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Wed, 9 May 2018 23:01:01 +0200 +Subject: x86/bugs, KVM: Extend speculation control for VIRT_SPEC_CTRL + +From: Thomas Gleixner + +commit ccbcd2674472a978b48c91c1fbfb66c0ff959f24 upstream + +AMD is proposing a VIRT_SPEC_CTRL MSR to handle the Speculative Store +Bypass Disable via MSR_AMD64_LS_CFG so that guests do not have to care +about the bit position of the SSBD bit and thus facilitate migration. +Also, the sibling coordination on Family 17H CPUs can only be done on +the host. + +Extend x86_spec_ctrl_set_guest() and x86_spec_ctrl_restore_host() with an +extra argument for the VIRT_SPEC_CTRL MSR. + +Hand in 0 from VMX and in SVM add a new virt_spec_ctrl member to the CPU +data structure which is going to be used in later patches for the actual +implementation. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/spec-ctrl.h | 9 ++++++--- + arch/x86/kernel/cpu/bugs.c | 20 ++++++++++++++++++-- + arch/x86/kvm/svm.c | 11 +++++++++-- + arch/x86/kvm/vmx.c | 5 +++-- + 4 files changed, 36 insertions(+), 9 deletions(-) + +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -10,10 +10,13 @@ + * the guest has, while on VMEXIT we restore the host view. This + * would be easier if SPEC_CTRL were architecturally maskable or + * shadowable for guests but this is not (currently) the case. +- * Takes the guest view of SPEC_CTRL MSR as a parameter. ++ * Takes the guest view of SPEC_CTRL MSR as a parameter and also ++ * the guest's version of VIRT_SPEC_CTRL, if emulated. + */ +-extern void x86_spec_ctrl_set_guest(u64); +-extern void x86_spec_ctrl_restore_host(u64); ++extern void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, ++ u64 guest_virt_spec_ctrl); ++extern void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, ++ u64 guest_virt_spec_ctrl); + + /* AMD specific Speculative Store Bypass MSR data */ + extern u64 x86_amd_ls_cfg_base; +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -151,7 +151,15 @@ u64 x86_spec_ctrl_get_default(void) + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); + +-void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl) ++/** ++ * x86_spec_ctrl_set_guest - Set speculation control registers for the guest ++ * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL ++ * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL ++ * (may get translated to MSR_AMD64_LS_CFG bits) ++ * ++ * Avoids writing to the MSR if the content/bits are the same ++ */ ++void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) + { + u64 host = x86_spec_ctrl_base; + +@@ -168,7 +176,15 @@ void x86_spec_ctrl_set_guest(u64 guest_s + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_set_guest); + +-void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl) ++/** ++ * x86_spec_ctrl_restore_host - Restore host speculation control registers ++ * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL ++ * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL ++ * (may get translated to MSR_AMD64_LS_CFG bits) ++ * ++ * Avoids writing to the MSR if the content/bits are the same ++ */ ++void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) + { + u64 host = x86_spec_ctrl_base; + +--- a/arch/x86/kvm/svm.c ++++ b/arch/x86/kvm/svm.c +@@ -192,6 +192,12 @@ struct vcpu_svm { + } host; + + u64 spec_ctrl; ++ /* ++ * Contains guest-controlled bits of VIRT_SPEC_CTRL, which will be ++ * translated into the appropriate L2_CFG bits on the host to ++ * perform speculative control. ++ */ ++ u64 virt_spec_ctrl; + + u32 *msrpm; + +@@ -1910,6 +1916,7 @@ static void svm_vcpu_reset(struct kvm_vc + + vcpu->arch.microcode_version = 0x01000065; + svm->spec_ctrl = 0; ++ svm->virt_spec_ctrl = 0; + + if (!init_event) { + svm->vcpu.arch.apic_base = APIC_DEFAULT_PHYS_BASE | +@@ -5401,7 +5408,7 @@ static void svm_vcpu_run(struct kvm_vcpu + * is no need to worry about the conditional branch over the wrmsr + * being speculatively taken. + */ +- x86_spec_ctrl_set_guest(svm->spec_ctrl); ++ x86_spec_ctrl_set_guest(svm->spec_ctrl, svm->virt_spec_ctrl); + + asm volatile ( + "push %%" _ASM_BP "; \n\t" +@@ -5525,7 +5532,7 @@ static void svm_vcpu_run(struct kvm_vcpu + if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) + svm->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); + +- x86_spec_ctrl_restore_host(svm->spec_ctrl); ++ x86_spec_ctrl_restore_host(svm->spec_ctrl, svm->virt_spec_ctrl); + + reload_tss(vcpu); + +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -9463,9 +9463,10 @@ static void __noclone vmx_vcpu_run(struc + * is no need to worry about the conditional branch over the wrmsr + * being speculatively taken. + */ +- x86_spec_ctrl_set_guest(vmx->spec_ctrl); ++ x86_spec_ctrl_set_guest(vmx->spec_ctrl, 0); + + vmx->__launched = vmx->loaded_vmcs->launched; ++ + asm( + /* Store host registers */ + "push %%" _ASM_DX "; push %%" _ASM_BP ";" +@@ -9601,7 +9602,7 @@ static void __noclone vmx_vcpu_run(struc + if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) + vmx->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); + +- x86_spec_ctrl_restore_host(vmx->spec_ctrl); ++ x86_spec_ctrl_restore_host(vmx->spec_ctrl, 0); + + /* Eliminate branch target predictions from guest mode */ + vmexit_fill_RSB(); diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-kvm-support-the-combination-of-guest-and-host-ibrs.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-kvm-support-the-combination-of-guest-and-host-ibrs.patch new file mode 100644 index 000000000..e6c34e679 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-kvm-support-the-combination-of-guest-and-host-ibrs.patch @@ -0,0 +1,126 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:19 -0400 +Subject: x86/bugs, KVM: Support the combination of guest and host IBRS + +From: Konrad Rzeszutek Wilk + +commit 5cf687548705412da47c9cec342fd952d71ed3d5 upstream + +A guest may modify the SPEC_CTRL MSR from the value used by the +kernel. Since the kernel doesn't use IBRS, this means a value of zero is +what is needed in the host. + +But the 336996-Speculative-Execution-Side-Channel-Mitigations.pdf refers to +the other bits as reserved so the kernel should respect the boot time +SPEC_CTRL value and use that. + +This allows to deal with future extensions to the SPEC_CTRL interface if +any at all. + +Note: This uses wrmsrl() instead of native_wrmsl(). I does not make any +difference as paravirt will over-write the callq *0xfff.. with the wrmsrl +assembler code. + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 10 ++++++++++ + arch/x86/kernel/cpu/bugs.c | 18 ++++++++++++++++++ + arch/x86/kvm/svm.c | 6 ++---- + arch/x86/kvm/vmx.c | 6 ++---- + 4 files changed, 32 insertions(+), 8 deletions(-) + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -228,6 +228,16 @@ enum spectre_v2_mitigation { + extern void x86_spec_ctrl_set(u64); + extern u64 x86_spec_ctrl_get_default(void); + ++/* ++ * On VMENTER we must preserve whatever view of the SPEC_CTRL MSR ++ * the guest has, while on VMEXIT we restore the host view. This ++ * would be easier if SPEC_CTRL were architecturally maskable or ++ * shadowable for guests but this is not (currently) the case. ++ * Takes the guest view of SPEC_CTRL MSR as a parameter. ++ */ ++extern void x86_spec_ctrl_set_guest(u64); ++extern void x86_spec_ctrl_restore_host(u64); ++ + extern char __indirect_thunk_start[]; + extern char __indirect_thunk_end[]; + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -123,6 +123,24 @@ u64 x86_spec_ctrl_get_default(void) + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); + ++void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl) ++{ ++ if (!boot_cpu_has(X86_FEATURE_IBRS)) ++ return; ++ if (x86_spec_ctrl_base != guest_spec_ctrl) ++ wrmsrl(MSR_IA32_SPEC_CTRL, guest_spec_ctrl); ++} ++EXPORT_SYMBOL_GPL(x86_spec_ctrl_set_guest); ++ ++void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl) ++{ ++ if (!boot_cpu_has(X86_FEATURE_IBRS)) ++ return; ++ if (x86_spec_ctrl_base != guest_spec_ctrl) ++ wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); ++} ++EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); ++ + #ifdef RETPOLINE + static bool spectre_v2_bad_module; + +--- a/arch/x86/kvm/svm.c ++++ b/arch/x86/kvm/svm.c +@@ -5401,8 +5401,7 @@ static void svm_vcpu_run(struct kvm_vcpu + * is no need to worry about the conditional branch over the wrmsr + * being speculatively taken. + */ +- if (svm->spec_ctrl) +- native_wrmsrl(MSR_IA32_SPEC_CTRL, svm->spec_ctrl); ++ x86_spec_ctrl_set_guest(svm->spec_ctrl); + + asm volatile ( + "push %%" _ASM_BP "; \n\t" +@@ -5514,8 +5513,7 @@ static void svm_vcpu_run(struct kvm_vcpu + if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) + svm->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); + +- if (svm->spec_ctrl) +- native_wrmsrl(MSR_IA32_SPEC_CTRL, 0); ++ x86_spec_ctrl_restore_host(svm->spec_ctrl); + + /* Eliminate branch target predictions from guest mode */ + vmexit_fill_RSB(); +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -9466,8 +9466,7 @@ static void __noclone vmx_vcpu_run(struc + * is no need to worry about the conditional branch over the wrmsr + * being speculatively taken. + */ +- if (vmx->spec_ctrl) +- native_wrmsrl(MSR_IA32_SPEC_CTRL, vmx->spec_ctrl); ++ x86_spec_ctrl_set_guest(vmx->spec_ctrl); + + vmx->__launched = vmx->loaded_vmcs->launched; + asm( +@@ -9605,8 +9604,7 @@ static void __noclone vmx_vcpu_run(struc + if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) + vmx->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); + +- if (vmx->spec_ctrl) +- native_wrmsrl(MSR_IA32_SPEC_CTRL, 0); ++ x86_spec_ctrl_restore_host(vmx->spec_ctrl); + + /* Eliminate branch target predictions from guest mode */ + vmexit_fill_RSB(); diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-make-boot-modes-__ro_after_init.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-make-boot-modes-__ro_after_init.patch new file mode 100644 index 000000000..4aea28707 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-make-boot-modes-__ro_after_init.patch @@ -0,0 +1,39 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Kees Cook +Date: Thu, 3 May 2018 15:03:30 -0700 +Subject: x86/bugs: Make boot modes __ro_after_init + +From: Kees Cook + +commit f9544b2b076ca90d887c5ae5d74fab4c21bb7c13 upstream + +There's no reason for these to be changed after boot. + +Signed-off-by: Kees Cook +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 5 +++-- + 1 file changed, 3 insertions(+), 2 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -129,7 +129,8 @@ static const char *spectre_v2_strings[] + #undef pr_fmt + #define pr_fmt(fmt) "Spectre V2 : " fmt + +-static enum spectre_v2_mitigation spectre_v2_enabled = SPECTRE_V2_NONE; ++static enum spectre_v2_mitigation spectre_v2_enabled __ro_after_init = ++ SPECTRE_V2_NONE; + + void x86_spec_ctrl_set(u64 val) + { +@@ -407,7 +408,7 @@ retpoline_auto: + #undef pr_fmt + #define pr_fmt(fmt) "Speculative Store Bypass: " fmt + +-static enum ssb_mitigation ssb_mode = SPEC_STORE_BYPASS_NONE; ++static enum ssb_mitigation ssb_mode __ro_after_init = SPEC_STORE_BYPASS_NONE; + + /* The kernel command line selection */ + enum ssb_mitigation_cmd { diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-make-cpu_show_common-static.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-make-cpu_show_common-static.patch new file mode 100644 index 000000000..7c3b934d0 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-make-cpu_show_common-static.patch @@ -0,0 +1,30 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Jiri Kosina +Date: Thu, 10 May 2018 22:47:32 +0200 +Subject: x86/bugs: Make cpu_show_common() static + +From: Jiri Kosina + +commit 7bb4d366cba992904bffa4820d24e70a3de93e76 upstream + +cpu_show_common() is not used outside of arch/x86/kernel/cpu/bugs.c, so +make it static. + +Signed-off-by: Jiri Kosina +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -640,7 +640,7 @@ void x86_spec_ctrl_setup_ap(void) + + #ifdef CONFIG_SYSFS + +-ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr, ++static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr, + char *buf, unsigned int bug) + { + if (!boot_cpu_has_bug(bug)) diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-provide-boot-parameters-for-the-spec_store_bypass_disable-mitigation.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-provide-boot-parameters-for-the-spec_store_bypass_disable-mitigation.patch new file mode 100644 index 000000000..1f3bc827c --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-provide-boot-parameters-for-the-spec_store_bypass_disable-mitigation.patch @@ -0,0 +1,261 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:21 -0400 +Subject: x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation + +From: Konrad Rzeszutek Wilk + +commit 24f7fc83b9204d20f878c57cb77d261ae825e033 upstream + +Contemporary high performance processors use a common industry-wide +optimization known as "Speculative Store Bypass" in which loads from +addresses to which a recent store has occurred may (speculatively) see an +older value. Intel refers to this feature as "Memory Disambiguation" which +is part of their "Smart Memory Access" capability. + +Memory Disambiguation can expose a cache side-channel attack against such +speculatively read values. An attacker can create exploit code that allows +them to read memory outside of a sandbox environment (for example, +malicious JavaScript in a web page), or to perform more complex attacks +against code running within the same privilege level, e.g. via the stack. + +As a first step to mitigate against such attacks, provide two boot command +line control knobs: + + nospec_store_bypass_disable + spec_store_bypass_disable=[off,auto,on] + +By default affected x86 processors will power on with Speculative +Store Bypass enabled. Hence the provided kernel parameters are written +from the point of view of whether to enable a mitigation or not. +The parameters are as follows: + + - auto - Kernel detects whether your CPU model contains an implementation + of Speculative Store Bypass and picks the most appropriate + mitigation. + + - on - disable Speculative Store Bypass + - off - enable Speculative Store Bypass + +[ tglx: Reordered the checks so that the whole evaluation is not done + when the CPU does not support RDS ] + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/admin-guide/kernel-parameters.txt | 33 +++++++ + arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/nospec-branch.h | 6 + + arch/x86/kernel/cpu/bugs.c | 103 ++++++++++++++++++++++++ + 4 files changed, 143 insertions(+) + +--- a/Documentation/admin-guide/kernel-parameters.txt ++++ b/Documentation/admin-guide/kernel-parameters.txt +@@ -2647,6 +2647,9 @@ + allow data leaks with this option, which is equivalent + to spectre_v2=off. + ++ nospec_store_bypass_disable ++ [HW] Disable all mitigations for the Speculative Store Bypass vulnerability ++ + noxsave [BUGS=X86] Disables x86 extended register state save + and restore using xsave. The kernel will fallback to + enabling legacy floating-point and sse state. +@@ -3997,6 +4000,36 @@ + Not specifying this option is equivalent to + spectre_v2=auto. + ++ spec_store_bypass_disable= ++ [HW] Control Speculative Store Bypass (SSB) Disable mitigation ++ (Speculative Store Bypass vulnerability) ++ ++ Certain CPUs are vulnerable to an exploit against a ++ a common industry wide performance optimization known ++ as "Speculative Store Bypass" in which recent stores ++ to the same memory location may not be observed by ++ later loads during speculative execution. The idea ++ is that such stores are unlikely and that they can ++ be detected prior to instruction retirement at the ++ end of a particular speculation execution window. ++ ++ In vulnerable processors, the speculatively forwarded ++ store can be used in a cache side channel attack, for ++ example to read memory to which the attacker does not ++ directly have access (e.g. inside sandboxed code). ++ ++ This parameter controls whether the Speculative Store ++ Bypass optimization is used. ++ ++ on - Unconditionally disable Speculative Store Bypass ++ off - Unconditionally enable Speculative Store Bypass ++ auto - Kernel detects whether the CPU model contains an ++ implementation of Speculative Store Bypass and ++ picks the most appropriate mitigation ++ ++ Not specifying this option is equivalent to ++ spec_store_bypass_disable=auto. ++ + spia_io_base= [HW,MTD] + spia_fio_base= + spia_pedr= +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -214,6 +214,7 @@ + + #define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */ + #define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */ ++#define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */ + + /* Virtualization flags: Linux defined, word 8 */ + #define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */ +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -238,6 +238,12 @@ extern u64 x86_spec_ctrl_get_default(voi + extern void x86_spec_ctrl_set_guest(u64); + extern void x86_spec_ctrl_restore_host(u64); + ++/* The Speculative Store Bypass disable variants */ ++enum ssb_mitigation { ++ SPEC_STORE_BYPASS_NONE, ++ SPEC_STORE_BYPASS_DISABLE, ++}; ++ + extern char __indirect_thunk_start[]; + extern char __indirect_thunk_end[]; + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -27,6 +27,7 @@ + #include + + static void __init spectre_v2_select_mitigation(void); ++static void __init ssb_select_mitigation(void); + + /* + * Our boot-time value of the SPEC_CTRL MSR. We read it once so that any +@@ -53,6 +54,12 @@ void __init check_bugs(void) + /* Select the proper spectre mitigation before patching alternatives */ + spectre_v2_select_mitigation(); + ++ /* ++ * Select proper mitigation for any exposure to the Speculative Store ++ * Bypass vulnerability. ++ */ ++ ssb_select_mitigation(); ++ + #ifdef CONFIG_X86_32 + /* + * Check whether we are able to run this kernel safely on SMP. +@@ -358,6 +365,99 @@ retpoline_auto: + } + + #undef pr_fmt ++#define pr_fmt(fmt) "Speculative Store Bypass: " fmt ++ ++static enum ssb_mitigation ssb_mode = SPEC_STORE_BYPASS_NONE; ++ ++/* The kernel command line selection */ ++enum ssb_mitigation_cmd { ++ SPEC_STORE_BYPASS_CMD_NONE, ++ SPEC_STORE_BYPASS_CMD_AUTO, ++ SPEC_STORE_BYPASS_CMD_ON, ++}; ++ ++static const char *ssb_strings[] = { ++ [SPEC_STORE_BYPASS_NONE] = "Vulnerable", ++ [SPEC_STORE_BYPASS_DISABLE] = "Mitigation: Speculative Store Bypass disabled" ++}; ++ ++static const struct { ++ const char *option; ++ enum ssb_mitigation_cmd cmd; ++} ssb_mitigation_options[] = { ++ { "auto", SPEC_STORE_BYPASS_CMD_AUTO }, /* Platform decides */ ++ { "on", SPEC_STORE_BYPASS_CMD_ON }, /* Disable Speculative Store Bypass */ ++ { "off", SPEC_STORE_BYPASS_CMD_NONE }, /* Don't touch Speculative Store Bypass */ ++}; ++ ++static enum ssb_mitigation_cmd __init ssb_parse_cmdline(void) ++{ ++ enum ssb_mitigation_cmd cmd = SPEC_STORE_BYPASS_CMD_AUTO; ++ char arg[20]; ++ int ret, i; ++ ++ if (cmdline_find_option_bool(boot_command_line, "nospec_store_bypass_disable")) { ++ return SPEC_STORE_BYPASS_CMD_NONE; ++ } else { ++ ret = cmdline_find_option(boot_command_line, "spec_store_bypass_disable", ++ arg, sizeof(arg)); ++ if (ret < 0) ++ return SPEC_STORE_BYPASS_CMD_AUTO; ++ ++ for (i = 0; i < ARRAY_SIZE(ssb_mitigation_options); i++) { ++ if (!match_option(arg, ret, ssb_mitigation_options[i].option)) ++ continue; ++ ++ cmd = ssb_mitigation_options[i].cmd; ++ break; ++ } ++ ++ if (i >= ARRAY_SIZE(ssb_mitigation_options)) { ++ pr_err("unknown option (%s). Switching to AUTO select\n", arg); ++ return SPEC_STORE_BYPASS_CMD_AUTO; ++ } ++ } ++ ++ return cmd; ++} ++ ++static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void) ++{ ++ enum ssb_mitigation mode = SPEC_STORE_BYPASS_NONE; ++ enum ssb_mitigation_cmd cmd; ++ ++ if (!boot_cpu_has(X86_FEATURE_RDS)) ++ return mode; ++ ++ cmd = ssb_parse_cmdline(); ++ if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS) && ++ (cmd == SPEC_STORE_BYPASS_CMD_NONE || ++ cmd == SPEC_STORE_BYPASS_CMD_AUTO)) ++ return mode; ++ ++ switch (cmd) { ++ case SPEC_STORE_BYPASS_CMD_AUTO: ++ case SPEC_STORE_BYPASS_CMD_ON: ++ mode = SPEC_STORE_BYPASS_DISABLE; ++ break; ++ case SPEC_STORE_BYPASS_CMD_NONE: ++ break; ++ } ++ ++ if (mode != SPEC_STORE_BYPASS_NONE) ++ setup_force_cpu_cap(X86_FEATURE_SPEC_STORE_BYPASS_DISABLE); ++ return mode; ++} ++ ++static void ssb_select_mitigation() ++{ ++ ssb_mode = __ssb_select_mitigation(); ++ ++ if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) ++ pr_info("%s\n", ssb_strings[ssb_mode]); ++} ++ ++#undef pr_fmt + + #ifdef CONFIG_SYSFS + +@@ -383,6 +483,9 @@ ssize_t cpu_show_common(struct device *d + boot_cpu_has(X86_FEATURE_USE_IBRS_FW) ? ", IBRS_FW" : "", + spectre_v2_module_string()); + ++ case X86_BUG_SPEC_STORE_BYPASS: ++ return sprintf(buf, "%s\n", ssb_strings[ssb_mode]); ++ + default: + break; + } diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-read-spec_ctrl-msr-during-boot-and-re-use-reserved-bits.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-read-spec_ctrl-msr-during-boot-and-re-use-reserved-bits.patch new file mode 100644 index 000000000..6b58a3e7b --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-read-spec_ctrl-msr-during-boot-and-re-use-reserved-bits.patch @@ -0,0 +1,136 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:18 -0400 +Subject: x86/bugs: Read SPEC_CTRL MSR during boot and re-use reserved bits + +From: Konrad Rzeszutek Wilk + +commit 1b86883ccb8d5d9506529d42dbe1a5257cb30b18 upstream + +The 336996-Speculative-Execution-Side-Channel-Mitigations.pdf refers to all +the other bits as reserved. The Intel SDM glossary defines reserved as +implementation specific - aka unknown. + +As such at bootup this must be taken it into account and proper masking for +the bits in use applied. + +A copy of this document is available at +https://bugzilla.kernel.org/show_bug.cgi?id=199511 + +[ tglx: Made x86_spec_ctrl_base __ro_after_init ] + +Suggested-by: Jon Masters +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 24 ++++++++++++++++++++---- + arch/x86/kernel/cpu/bugs.c | 28 ++++++++++++++++++++++++++++ + 2 files changed, 48 insertions(+), 4 deletions(-) + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -217,6 +217,17 @@ enum spectre_v2_mitigation { + SPECTRE_V2_IBRS, + }; + ++/* ++ * The Intel specification for the SPEC_CTRL MSR requires that we ++ * preserve any already set reserved bits at boot time (e.g. for ++ * future additions that this kernel is not currently aware of). ++ * We then set any additional mitigation bits that we want ++ * ourselves and always use this as the base for SPEC_CTRL. ++ * We also use this when handling guest entry/exit as below. ++ */ ++extern void x86_spec_ctrl_set(u64); ++extern u64 x86_spec_ctrl_get_default(void); ++ + extern char __indirect_thunk_start[]; + extern char __indirect_thunk_end[]; + +@@ -254,8 +265,9 @@ void alternative_msr_write(unsigned int + + static inline void indirect_branch_prediction_barrier(void) + { +- alternative_msr_write(MSR_IA32_PRED_CMD, PRED_CMD_IBPB, +- X86_FEATURE_USE_IBPB); ++ u64 val = PRED_CMD_IBPB; ++ ++ alternative_msr_write(MSR_IA32_PRED_CMD, val, X86_FEATURE_USE_IBPB); + } + + /* +@@ -266,14 +278,18 @@ static inline void indirect_branch_predi + */ + #define firmware_restrict_branch_speculation_start() \ + do { \ ++ u64 val = x86_spec_ctrl_get_default() | SPEC_CTRL_IBRS; \ ++ \ + preempt_disable(); \ +- alternative_msr_write(MSR_IA32_SPEC_CTRL, SPEC_CTRL_IBRS, \ ++ alternative_msr_write(MSR_IA32_SPEC_CTRL, val, \ + X86_FEATURE_USE_IBRS_FW); \ + } while (0) + + #define firmware_restrict_branch_speculation_end() \ + do { \ +- alternative_msr_write(MSR_IA32_SPEC_CTRL, 0, \ ++ u64 val = x86_spec_ctrl_get_default(); \ ++ \ ++ alternative_msr_write(MSR_IA32_SPEC_CTRL, val, \ + X86_FEATURE_USE_IBRS_FW); \ + preempt_enable(); \ + } while (0) +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -28,6 +28,12 @@ + + static void __init spectre_v2_select_mitigation(void); + ++/* ++ * Our boot-time value of the SPEC_CTRL MSR. We read it once so that any ++ * writes to SPEC_CTRL contain whatever reserved bits have been set. ++ */ ++static u64 __ro_after_init x86_spec_ctrl_base; ++ + void __init check_bugs(void) + { + identify_boot_cpu(); +@@ -37,6 +43,13 @@ void __init check_bugs(void) + print_cpu_info(&boot_cpu_data); + } + ++ /* ++ * Read the SPEC_CTRL MSR to account for reserved bits which may ++ * have unknown values. ++ */ ++ if (boot_cpu_has(X86_FEATURE_IBRS)) ++ rdmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); ++ + /* Select the proper spectre mitigation before patching alternatives */ + spectre_v2_select_mitigation(); + +@@ -95,6 +108,21 @@ static const char *spectre_v2_strings[] + + static enum spectre_v2_mitigation spectre_v2_enabled = SPECTRE_V2_NONE; + ++void x86_spec_ctrl_set(u64 val) ++{ ++ if (val & ~SPEC_CTRL_IBRS) ++ WARN_ONCE(1, "SPEC_CTRL MSR value 0x%16llx is unknown.\n", val); ++ else ++ wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base | val); ++} ++EXPORT_SYMBOL_GPL(x86_spec_ctrl_set); ++ ++u64 x86_spec_ctrl_get_default(void) ++{ ++ return x86_spec_ctrl_base; ++} ++EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); ++ + #ifdef RETPOLINE + static bool spectre_v2_bad_module; + diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-remove-x86_spec_ctrl_set.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-remove-x86_spec_ctrl_set.patch new file mode 100644 index 000000000..546ae9773 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-remove-x86_spec_ctrl_set.patch @@ -0,0 +1,70 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sat, 12 May 2018 20:53:14 +0200 +Subject: x86/bugs: Remove x86_spec_ctrl_set() + +From: Thomas Gleixner + +commit 4b59bdb569453a60b752b274ca61f009e37f4dae upstream + +x86_spec_ctrl_set() is only used in bugs.c and the extra mask checks there +provide no real value as both call sites can just write x86_spec_ctrl_base +to MSR_SPEC_CTRL. x86_spec_ctrl_base is valid and does not need any extra +masking or checking. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 2 -- + arch/x86/kernel/cpu/bugs.c | 13 ++----------- + 2 files changed, 2 insertions(+), 13 deletions(-) + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -217,8 +217,6 @@ enum spectre_v2_mitigation { + SPECTRE_V2_IBRS, + }; + +-extern void x86_spec_ctrl_set(u64); +- + /* The Speculative Store Bypass disable variants */ + enum ssb_mitigation { + SPEC_STORE_BYPASS_NONE, +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -133,15 +133,6 @@ static const char *spectre_v2_strings[] + static enum spectre_v2_mitigation spectre_v2_enabled __ro_after_init = + SPECTRE_V2_NONE; + +-void x86_spec_ctrl_set(u64 val) +-{ +- if (val & x86_spec_ctrl_mask) +- WARN_ONCE(1, "SPEC_CTRL MSR value 0x%16llx is unknown.\n", val); +- else +- wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base | val); +-} +-EXPORT_SYMBOL_GPL(x86_spec_ctrl_set); +- + void + x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest) + { +@@ -503,7 +494,7 @@ static enum ssb_mitigation __init __ssb_ + case X86_VENDOR_INTEL: + x86_spec_ctrl_base |= SPEC_CTRL_SSBD; + x86_spec_ctrl_mask &= ~SPEC_CTRL_SSBD; +- x86_spec_ctrl_set(SPEC_CTRL_SSBD); ++ wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); + break; + case X86_VENDOR_AMD: + x86_amd_ssb_disable(); +@@ -615,7 +606,7 @@ int arch_prctl_spec_ctrl_get(struct task + void x86_spec_ctrl_setup_ap(void) + { + if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) +- x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask); ++ wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); + + if (ssb_mode == SPEC_STORE_BYPASS_DISABLE) + x86_amd_ssb_disable(); diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-rename-_rds-to-_ssbd.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-rename-_rds-to-_ssbd.patch new file mode 100644 index 000000000..34953f70f --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-rename-_rds-to-_ssbd.patch @@ -0,0 +1,380 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 9 May 2018 21:41:38 +0200 +Subject: x86/bugs: Rename _RDS to _SSBD + +From: Konrad Rzeszutek Wilk + +commit 9f65fb29374ee37856dbad847b4e121aab72b510 upstream + +Intel collateral will reference the SSB mitigation bit in IA32_SPEC_CTL[2] +as SSBD (Speculative Store Bypass Disable). + +Hence changing it. + +It is unclear yet what the MSR_IA32_ARCH_CAPABILITIES (0x10a) Bit(4) name +is going to be. Following the rename it would be SSBD_NO but that rolls out +to Speculative Store Bypass Disable No. + +Also fixed the missing space in X86_FEATURE_AMD_SSBD. + +[ tglx: Fixup x86_amd_rds_enable() and rds_tif_to_amd_ls_cfg() as well ] + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 4 ++-- + arch/x86/include/asm/msr-index.h | 10 +++++----- + arch/x86/include/asm/spec-ctrl.h | 12 ++++++------ + arch/x86/include/asm/thread_info.h | 6 +++--- + arch/x86/kernel/cpu/amd.c | 14 +++++++------- + arch/x86/kernel/cpu/bugs.c | 36 ++++++++++++++++++------------------ + arch/x86/kernel/cpu/common.c | 2 +- + arch/x86/kernel/cpu/intel.c | 2 +- + arch/x86/kernel/process.c | 8 ++++---- + arch/x86/kvm/cpuid.c | 2 +- + arch/x86/kvm/vmx.c | 6 +++--- + 11 files changed, 51 insertions(+), 51 deletions(-) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -215,7 +215,7 @@ + #define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */ + #define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */ + #define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */ +-#define X86_FEATURE_AMD_RDS (7*32+24) /* "" AMD RDS implementation */ ++#define X86_FEATURE_AMD_SSBD ( 7*32+24) /* "" AMD SSBD implementation */ + + /* Virtualization flags: Linux defined, word 8 */ + #define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */ +@@ -335,7 +335,7 @@ + #define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */ + #define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */ + #define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */ +-#define X86_FEATURE_RDS (18*32+31) /* Reduced Data Speculation */ ++#define X86_FEATURE_SSBD (18*32+31) /* Speculative Store Bypass Disable */ + + /* + * BUG word(s) +--- a/arch/x86/include/asm/msr-index.h ++++ b/arch/x86/include/asm/msr-index.h +@@ -42,8 +42,8 @@ + #define MSR_IA32_SPEC_CTRL 0x00000048 /* Speculation Control */ + #define SPEC_CTRL_IBRS (1 << 0) /* Indirect Branch Restricted Speculation */ + #define SPEC_CTRL_STIBP (1 << 1) /* Single Thread Indirect Branch Predictors */ +-#define SPEC_CTRL_RDS_SHIFT 2 /* Reduced Data Speculation bit */ +-#define SPEC_CTRL_RDS (1 << SPEC_CTRL_RDS_SHIFT) /* Reduced Data Speculation */ ++#define SPEC_CTRL_SSBD_SHIFT 2 /* Speculative Store Bypass Disable bit */ ++#define SPEC_CTRL_SSBD (1 << SPEC_CTRL_SSBD_SHIFT) /* Speculative Store Bypass Disable */ + + #define MSR_IA32_PRED_CMD 0x00000049 /* Prediction Command */ + #define PRED_CMD_IBPB (1 << 0) /* Indirect Branch Prediction Barrier */ +@@ -70,10 +70,10 @@ + #define MSR_IA32_ARCH_CAPABILITIES 0x0000010a + #define ARCH_CAP_RDCL_NO (1 << 0) /* Not susceptible to Meltdown */ + #define ARCH_CAP_IBRS_ALL (1 << 1) /* Enhanced IBRS support */ +-#define ARCH_CAP_RDS_NO (1 << 4) /* ++#define ARCH_CAP_SSBD_NO (1 << 4) /* + * Not susceptible to Speculative Store Bypass +- * attack, so no Reduced Data Speculation control +- * required. ++ * attack, so no Speculative Store Bypass ++ * control required. + */ + + #define MSR_IA32_BBL_CR_CTL 0x00000119 +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -17,20 +17,20 @@ extern void x86_spec_ctrl_restore_host(u + + /* AMD specific Speculative Store Bypass MSR data */ + extern u64 x86_amd_ls_cfg_base; +-extern u64 x86_amd_ls_cfg_rds_mask; ++extern u64 x86_amd_ls_cfg_ssbd_mask; + + /* The Intel SPEC CTRL MSR base value cache */ + extern u64 x86_spec_ctrl_base; + +-static inline u64 rds_tif_to_spec_ctrl(u64 tifn) ++static inline u64 ssbd_tif_to_spec_ctrl(u64 tifn) + { +- BUILD_BUG_ON(TIF_RDS < SPEC_CTRL_RDS_SHIFT); +- return (tifn & _TIF_RDS) >> (TIF_RDS - SPEC_CTRL_RDS_SHIFT); ++ BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); ++ return (tifn & _TIF_SSBD) >> (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); + } + +-static inline u64 rds_tif_to_amd_ls_cfg(u64 tifn) ++static inline u64 ssbd_tif_to_amd_ls_cfg(u64 tifn) + { +- return (tifn & _TIF_RDS) ? x86_amd_ls_cfg_rds_mask : 0ULL; ++ return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL; + } + + extern void speculative_store_bypass_update(void); +--- a/arch/x86/include/asm/thread_info.h ++++ b/arch/x86/include/asm/thread_info.h +@@ -79,7 +79,7 @@ struct thread_info { + #define TIF_SIGPENDING 2 /* signal pending */ + #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ + #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ +-#define TIF_RDS 5 /* Reduced data speculation */ ++#define TIF_SSBD 5 /* Reduced data speculation */ + #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ + #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ + #define TIF_SECCOMP 8 /* secure computing */ +@@ -106,7 +106,7 @@ struct thread_info { + #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) + #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) + #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) +-#define _TIF_RDS (1 << TIF_RDS) ++#define _TIF_SSBD (1 << TIF_SSBD) + #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) + #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) + #define _TIF_SECCOMP (1 << TIF_SECCOMP) +@@ -146,7 +146,7 @@ struct thread_info { + + /* flags to check in __switch_to() */ + #define _TIF_WORK_CTXSW \ +- (_TIF_IO_BITMAP|_TIF_NOCPUID|_TIF_NOTSC|_TIF_BLOCKSTEP|_TIF_RDS) ++ (_TIF_IO_BITMAP|_TIF_NOCPUID|_TIF_NOTSC|_TIF_BLOCKSTEP|_TIF_SSBD) + + #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) + #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) +--- a/arch/x86/kernel/cpu/amd.c ++++ b/arch/x86/kernel/cpu/amd.c +@@ -567,12 +567,12 @@ static void bsp_init_amd(struct cpuinfo_ + } + /* + * Try to cache the base value so further operations can +- * avoid RMW. If that faults, do not enable RDS. ++ * avoid RMW. If that faults, do not enable SSBD. + */ + if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) { +- setup_force_cpu_cap(X86_FEATURE_RDS); +- setup_force_cpu_cap(X86_FEATURE_AMD_RDS); +- x86_amd_ls_cfg_rds_mask = 1ULL << bit; ++ setup_force_cpu_cap(X86_FEATURE_SSBD); ++ setup_force_cpu_cap(X86_FEATURE_AMD_SSBD); ++ x86_amd_ls_cfg_ssbd_mask = 1ULL << bit; + } + } + } +@@ -920,9 +920,9 @@ static void init_amd(struct cpuinfo_x86 + if (!cpu_has(c, X86_FEATURE_XENPV)) + set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); + +- if (boot_cpu_has(X86_FEATURE_AMD_RDS)) { +- set_cpu_cap(c, X86_FEATURE_RDS); +- set_cpu_cap(c, X86_FEATURE_AMD_RDS); ++ if (boot_cpu_has(X86_FEATURE_AMD_SSBD)) { ++ set_cpu_cap(c, X86_FEATURE_SSBD); ++ set_cpu_cap(c, X86_FEATURE_AMD_SSBD); + } + } + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -45,10 +45,10 @@ static u64 __ro_after_init x86_spec_ctrl + + /* + * AMD specific MSR info for Speculative Store Bypass control. +- * x86_amd_ls_cfg_rds_mask is initialized in identify_boot_cpu(). ++ * x86_amd_ls_cfg_ssbd_mask is initialized in identify_boot_cpu(). + */ + u64 __ro_after_init x86_amd_ls_cfg_base; +-u64 __ro_after_init x86_amd_ls_cfg_rds_mask; ++u64 __ro_after_init x86_amd_ls_cfg_ssbd_mask; + + void __init check_bugs(void) + { +@@ -146,7 +146,7 @@ u64 x86_spec_ctrl_get_default(void) + u64 msrval = x86_spec_ctrl_base; + + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) +- msrval |= rds_tif_to_spec_ctrl(current_thread_info()->flags); ++ msrval |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + return msrval; + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); +@@ -159,7 +159,7 @@ void x86_spec_ctrl_set_guest(u64 guest_s + return; + + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) +- host |= rds_tif_to_spec_ctrl(current_thread_info()->flags); ++ host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + + if (host != guest_spec_ctrl) + wrmsrl(MSR_IA32_SPEC_CTRL, guest_spec_ctrl); +@@ -174,18 +174,18 @@ void x86_spec_ctrl_restore_host(u64 gues + return; + + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) +- host |= rds_tif_to_spec_ctrl(current_thread_info()->flags); ++ host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + + if (host != guest_spec_ctrl) + wrmsrl(MSR_IA32_SPEC_CTRL, host); + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); + +-static void x86_amd_rds_enable(void) ++static void x86_amd_ssb_disable(void) + { +- u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_rds_mask; ++ u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_ssbd_mask; + +- if (boot_cpu_has(X86_FEATURE_AMD_RDS)) ++ if (boot_cpu_has(X86_FEATURE_AMD_SSBD)) + wrmsrl(MSR_AMD64_LS_CFG, msrval); + } + +@@ -473,7 +473,7 @@ static enum ssb_mitigation_cmd __init __ + enum ssb_mitigation mode = SPEC_STORE_BYPASS_NONE; + enum ssb_mitigation_cmd cmd; + +- if (!boot_cpu_has(X86_FEATURE_RDS)) ++ if (!boot_cpu_has(X86_FEATURE_SSBD)) + return mode; + + cmd = ssb_parse_cmdline(); +@@ -507,7 +507,7 @@ static enum ssb_mitigation_cmd __init __ + /* + * We have three CPU feature flags that are in play here: + * - X86_BUG_SPEC_STORE_BYPASS - CPU is susceptible. +- * - X86_FEATURE_RDS - CPU is able to turn off speculative store bypass ++ * - X86_FEATURE_SSBD - CPU is able to turn off speculative store bypass + * - X86_FEATURE_SPEC_STORE_BYPASS_DISABLE - engage the mitigation + */ + if (mode == SPEC_STORE_BYPASS_DISABLE) { +@@ -518,12 +518,12 @@ static enum ssb_mitigation_cmd __init __ + */ + switch (boot_cpu_data.x86_vendor) { + case X86_VENDOR_INTEL: +- x86_spec_ctrl_base |= SPEC_CTRL_RDS; +- x86_spec_ctrl_mask &= ~SPEC_CTRL_RDS; +- x86_spec_ctrl_set(SPEC_CTRL_RDS); ++ x86_spec_ctrl_base |= SPEC_CTRL_SSBD; ++ x86_spec_ctrl_mask &= ~SPEC_CTRL_SSBD; ++ x86_spec_ctrl_set(SPEC_CTRL_SSBD); + break; + case X86_VENDOR_AMD: +- x86_amd_rds_enable(); ++ x86_amd_ssb_disable(); + break; + } + } +@@ -556,16 +556,16 @@ static int ssb_prctl_set(struct task_str + if (task_spec_ssb_force_disable(task)) + return -EPERM; + task_clear_spec_ssb_disable(task); +- update = test_and_clear_tsk_thread_flag(task, TIF_RDS); ++ update = test_and_clear_tsk_thread_flag(task, TIF_SSBD); + break; + case PR_SPEC_DISABLE: + task_set_spec_ssb_disable(task); +- update = !test_and_set_tsk_thread_flag(task, TIF_RDS); ++ update = !test_and_set_tsk_thread_flag(task, TIF_SSBD); + break; + case PR_SPEC_FORCE_DISABLE: + task_set_spec_ssb_disable(task); + task_set_spec_ssb_force_disable(task); +- update = !test_and_set_tsk_thread_flag(task, TIF_RDS); ++ update = !test_and_set_tsk_thread_flag(task, TIF_SSBD); + break; + default: + return -ERANGE; +@@ -635,7 +635,7 @@ void x86_spec_ctrl_setup_ap(void) + x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask); + + if (ssb_mode == SPEC_STORE_BYPASS_DISABLE) +- x86_amd_rds_enable(); ++ x86_amd_ssb_disable(); + } + + #ifdef CONFIG_SYSFS +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -950,7 +950,7 @@ static void __init cpu_set_bug_bits(stru + rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); + + if (!x86_match_cpu(cpu_no_spec_store_bypass) && +- !(ia32_cap & ARCH_CAP_RDS_NO)) ++ !(ia32_cap & ARCH_CAP_SSBD_NO)) + setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS); + + if (x86_match_cpu(cpu_no_speculation)) +--- a/arch/x86/kernel/cpu/intel.c ++++ b/arch/x86/kernel/cpu/intel.c +@@ -189,7 +189,7 @@ static void early_init_intel(struct cpui + setup_clear_cpu_cap(X86_FEATURE_STIBP); + setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL); + setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP); +- setup_clear_cpu_cap(X86_FEATURE_RDS); ++ setup_clear_cpu_cap(X86_FEATURE_SSBD); + } + + /* +--- a/arch/x86/kernel/process.c ++++ b/arch/x86/kernel/process.c +@@ -283,11 +283,11 @@ static __always_inline void __speculativ + { + u64 msr; + +- if (static_cpu_has(X86_FEATURE_AMD_RDS)) { +- msr = x86_amd_ls_cfg_base | rds_tif_to_amd_ls_cfg(tifn); ++ if (static_cpu_has(X86_FEATURE_AMD_SSBD)) { ++ msr = x86_amd_ls_cfg_base | ssbd_tif_to_amd_ls_cfg(tifn); + wrmsrl(MSR_AMD64_LS_CFG, msr); + } else { +- msr = x86_spec_ctrl_base | rds_tif_to_spec_ctrl(tifn); ++ msr = x86_spec_ctrl_base | ssbd_tif_to_spec_ctrl(tifn); + wrmsrl(MSR_IA32_SPEC_CTRL, msr); + } + } +@@ -329,7 +329,7 @@ void __switch_to_xtra(struct task_struct + if ((tifp ^ tifn) & _TIF_NOCPUID) + set_cpuid_faulting(!!(tifn & _TIF_NOCPUID)); + +- if ((tifp ^ tifn) & _TIF_RDS) ++ if ((tifp ^ tifn) & _TIF_SSBD) + __speculative_store_bypass_update(tifn); + } + +--- a/arch/x86/kvm/cpuid.c ++++ b/arch/x86/kvm/cpuid.c +@@ -402,7 +402,7 @@ static inline int __do_cpuid_ent(struct + + /* cpuid 7.0.edx*/ + const u32 kvm_cpuid_7_0_edx_x86_features = +- F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(RDS) | ++ F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(SSBD) | + F(ARCH_CAPABILITIES); + + /* all calls to cpuid_count() should be made on the same cpu */ +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -3271,7 +3271,7 @@ static int vmx_get_msr(struct kvm_vcpu * + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_IBRS) && + !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) && +- !guest_cpuid_has(vcpu, X86_FEATURE_RDS)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_SSBD)) + return 1; + + msr_info->data = to_vmx(vcpu)->spec_ctrl; +@@ -3393,11 +3393,11 @@ static int vmx_set_msr(struct kvm_vcpu * + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_IBRS) && + !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) && +- !guest_cpuid_has(vcpu, X86_FEATURE_RDS)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_SSBD)) + return 1; + + /* The STIBP bit doesn't fault even if it's not advertised */ +- if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP | SPEC_CTRL_RDS)) ++ if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP | SPEC_CTRL_SSBD)) + return 1; + + vmx->spec_ctrl = data; diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-rename-ssbd_no-to-ssb_no.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-rename-ssbd_no-to-ssb_no.patch new file mode 100644 index 000000000..177c29e5b --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-rename-ssbd_no-to-ssb_no.patch @@ -0,0 +1,42 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 16 May 2018 23:18:09 -0400 +Subject: x86/bugs: Rename SSBD_NO to SSB_NO + +From: Konrad Rzeszutek Wilk + +commit 240da953fcc6a9008c92fae5b1f727ee5ed167ab upstream + +The "336996 Speculative Execution Side Channel Mitigations" from +May defines this as SSB_NO, hence lets sync-up. + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/msr-index.h | 2 +- + arch/x86/kernel/cpu/common.c | 2 +- + 2 files changed, 2 insertions(+), 2 deletions(-) + +--- a/arch/x86/include/asm/msr-index.h ++++ b/arch/x86/include/asm/msr-index.h +@@ -70,7 +70,7 @@ + #define MSR_IA32_ARCH_CAPABILITIES 0x0000010a + #define ARCH_CAP_RDCL_NO (1 << 0) /* Not susceptible to Meltdown */ + #define ARCH_CAP_IBRS_ALL (1 << 1) /* Enhanced IBRS support */ +-#define ARCH_CAP_SSBD_NO (1 << 4) /* ++#define ARCH_CAP_SSB_NO (1 << 4) /* + * Not susceptible to Speculative Store Bypass + * attack, so no Speculative Store Bypass + * control required. +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -965,7 +965,7 @@ static void __init cpu_set_bug_bits(stru + rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); + + if (!x86_match_cpu(cpu_no_spec_store_bypass) && +- !(ia32_cap & ARCH_CAP_SSBD_NO)) ++ !(ia32_cap & ARCH_CAP_SSB_NO)) + setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS); + + if (x86_match_cpu(cpu_no_speculation)) diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-rework-spec_ctrl-base-and-mask-logic.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-rework-spec_ctrl-base-and-mask-logic.patch new file mode 100644 index 000000000..240472421 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-rework-spec_ctrl-base-and-mask-logic.patch @@ -0,0 +1,91 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sat, 12 May 2018 20:10:00 +0200 +Subject: x86/bugs: Rework spec_ctrl base and mask logic + +From: Thomas Gleixner + +commit be6fcb5478e95bb1c91f489121238deb3abca46a upstream + +x86_spec_ctrL_mask is intended to mask out bits from a MSR_SPEC_CTRL value +which are not to be modified. However the implementation is not really used +and the bitmask was inverted to make a check easier, which was removed in +"x86/bugs: Remove x86_spec_ctrl_set()" + +Aside of that it is missing the STIBP bit if it is supported by the +platform, so if the mask would be used in x86_virt_spec_ctrl() then it +would prevent a guest from setting STIBP. + +Add the STIBP bit if supported and use the mask in x86_virt_spec_ctrl() to +sanitize the value which is supplied by the guest. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 26 +++++++++++++++++++------- + 1 file changed, 19 insertions(+), 7 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -42,7 +42,7 @@ EXPORT_SYMBOL_GPL(x86_spec_ctrl_base); + * The vendor and possibly platform specific bits which can be modified in + * x86_spec_ctrl_base. + */ +-static u64 __ro_after_init x86_spec_ctrl_mask = ~SPEC_CTRL_IBRS; ++static u64 __ro_after_init x86_spec_ctrl_mask = SPEC_CTRL_IBRS; + + /* + * AMD specific MSR info for Speculative Store Bypass control. +@@ -68,6 +68,10 @@ void __init check_bugs(void) + if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + rdmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); + ++ /* Allow STIBP in MSR_SPEC_CTRL if supported */ ++ if (boot_cpu_has(X86_FEATURE_STIBP)) ++ x86_spec_ctrl_mask |= SPEC_CTRL_STIBP; ++ + /* Select the proper spectre mitigation before patching alternatives */ + spectre_v2_select_mitigation(); + +@@ -136,18 +140,26 @@ static enum spectre_v2_mitigation spectr + void + x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest) + { ++ u64 msrval, guestval, hostval = x86_spec_ctrl_base; + struct thread_info *ti = current_thread_info(); +- u64 msr, host = x86_spec_ctrl_base; + + /* Is MSR_SPEC_CTRL implemented ? */ + if (static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) { ++ /* ++ * Restrict guest_spec_ctrl to supported values. Clear the ++ * modifiable bits in the host base value and or the ++ * modifiable bits from the guest value. ++ */ ++ guestval = hostval & ~x86_spec_ctrl_mask; ++ guestval |= guest_spec_ctrl & x86_spec_ctrl_mask; ++ + /* SSBD controlled in MSR_SPEC_CTRL */ + if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) +- host |= ssbd_tif_to_spec_ctrl(ti->flags); ++ hostval |= ssbd_tif_to_spec_ctrl(ti->flags); + +- if (host != guest_spec_ctrl) { +- msr = setguest ? guest_spec_ctrl : host; +- wrmsrl(MSR_IA32_SPEC_CTRL, msr); ++ if (hostval != guestval) { ++ msrval = setguest ? guestval : hostval; ++ wrmsrl(MSR_IA32_SPEC_CTRL, msrval); + } + } + } +@@ -493,7 +505,7 @@ static enum ssb_mitigation __init __ssb_ + switch (boot_cpu_data.x86_vendor) { + case X86_VENDOR_INTEL: + x86_spec_ctrl_base |= SPEC_CTRL_SSBD; +- x86_spec_ctrl_mask &= ~SPEC_CTRL_SSBD; ++ x86_spec_ctrl_mask |= SPEC_CTRL_SSBD; + wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); + break; + case X86_VENDOR_AMD: diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-unify-x86_spec_ctrl_-set_guest-restore_host.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-unify-x86_spec_ctrl_-set_guest-restore_host.patch new file mode 100644 index 000000000..3eac55491 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-unify-x86_spec_ctrl_-set_guest-restore_host.patch @@ -0,0 +1,139 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Borislav Petkov +Date: Sat, 12 May 2018 00:14:51 +0200 +Subject: x86/bugs: Unify x86_spec_ctrl_{set_guest,restore_host} + +From: Borislav Petkov + +commit cc69b34989210f067b2c51d5539b5f96ebcc3a01 upstream + +Function bodies are very similar and are going to grow more almost +identical code. Add a bool arg to determine whether SPEC_CTRL is being set +for the guest or restored to the host. + +No functional changes. + +Signed-off-by: Borislav Petkov +Signed-off-by: Thomas Gleixner +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/spec-ctrl.h | 33 ++++++++++++++++++--- + arch/x86/kernel/cpu/bugs.c | 60 +++++++++------------------------------ + 2 files changed, 44 insertions(+), 49 deletions(-) + +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -13,10 +13,35 @@ + * Takes the guest view of SPEC_CTRL MSR as a parameter and also + * the guest's version of VIRT_SPEC_CTRL, if emulated. + */ +-extern void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, +- u64 guest_virt_spec_ctrl); +-extern void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, +- u64 guest_virt_spec_ctrl); ++extern void x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool guest); ++ ++/** ++ * x86_spec_ctrl_set_guest - Set speculation control registers for the guest ++ * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL ++ * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL ++ * (may get translated to MSR_AMD64_LS_CFG bits) ++ * ++ * Avoids writing to the MSR if the content/bits are the same ++ */ ++static inline ++void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) ++{ ++ x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, true); ++} ++ ++/** ++ * x86_spec_ctrl_restore_host - Restore host speculation control registers ++ * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL ++ * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL ++ * (may get translated to MSR_AMD64_LS_CFG bits) ++ * ++ * Avoids writing to the MSR if the content/bits are the same ++ */ ++static inline ++void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) ++{ ++ x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, false); ++} + + /* AMD specific Speculative Store Bypass MSR data */ + extern u64 x86_amd_ls_cfg_base; +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -151,55 +151,25 @@ u64 x86_spec_ctrl_get_default(void) + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); + +-/** +- * x86_spec_ctrl_set_guest - Set speculation control registers for the guest +- * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL +- * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL +- * (may get translated to MSR_AMD64_LS_CFG bits) +- * +- * Avoids writing to the MSR if the content/bits are the same +- */ +-void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) ++void ++x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest) + { +- u64 host = x86_spec_ctrl_base; ++ struct thread_info *ti = current_thread_info(); ++ u64 msr, host = x86_spec_ctrl_base; + + /* Is MSR_SPEC_CTRL implemented ? */ +- if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) +- return; +- +- /* SSBD controlled in MSR_SPEC_CTRL */ +- if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) +- host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); +- +- if (host != guest_spec_ctrl) +- wrmsrl(MSR_IA32_SPEC_CTRL, guest_spec_ctrl); +-} +-EXPORT_SYMBOL_GPL(x86_spec_ctrl_set_guest); +- +-/** +- * x86_spec_ctrl_restore_host - Restore host speculation control registers +- * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL +- * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL +- * (may get translated to MSR_AMD64_LS_CFG bits) +- * +- * Avoids writing to the MSR if the content/bits are the same +- */ +-void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) +-{ +- u64 host = x86_spec_ctrl_base; +- +- /* Is MSR_SPEC_CTRL implemented ? */ +- if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) +- return; +- +- /* SSBD controlled in MSR_SPEC_CTRL */ +- if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) +- host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); +- +- if (host != guest_spec_ctrl) +- wrmsrl(MSR_IA32_SPEC_CTRL, host); ++ if (static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) { ++ /* SSBD controlled in MSR_SPEC_CTRL */ ++ if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) ++ host |= ssbd_tif_to_spec_ctrl(ti->flags); ++ ++ if (host != guest_spec_ctrl) { ++ msr = setguest ? guest_spec_ctrl : host; ++ wrmsrl(MSR_IA32_SPEC_CTRL, msr); ++ } ++ } + } +-EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); ++EXPORT_SYMBOL_GPL(x86_virt_spec_ctrl); + + static void x86_amd_ssb_disable(void) + { diff --git a/debian/patches/bugfix/x86/ssb/x86-bugs-whitelist-allowed-spec_ctrl-msr-values.patch b/debian/patches/bugfix/x86/ssb/x86-bugs-whitelist-allowed-spec_ctrl-msr-values.patch new file mode 100644 index 000000000..608b13d13 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-bugs-whitelist-allowed-spec_ctrl-msr-values.patch @@ -0,0 +1,66 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:23 -0400 +Subject: x86/bugs: Whitelist allowed SPEC_CTRL MSR values + +From: Konrad Rzeszutek Wilk + +commit 1115a859f33276fe8afb31c60cf9d8e657872558 upstream + +Intel and AMD SPEC_CTRL (0x48) MSR semantics may differ in the +future (or in fact use different MSRs for the same functionality). + +As such a run-time mechanism is required to whitelist the appropriate MSR +values. + +[ tglx: Made the variable __ro_after_init ] + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kernel/cpu/bugs.c | 11 +++++++++-- + 1 file changed, 9 insertions(+), 2 deletions(-) + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -35,6 +35,12 @@ static void __init ssb_select_mitigation + */ + static u64 __ro_after_init x86_spec_ctrl_base; + ++/* ++ * The vendor and possibly platform specific bits which can be modified in ++ * x86_spec_ctrl_base. ++ */ ++static u64 __ro_after_init x86_spec_ctrl_mask = ~SPEC_CTRL_IBRS; ++ + void __init check_bugs(void) + { + identify_boot_cpu(); +@@ -117,7 +123,7 @@ static enum spectre_v2_mitigation spectr + + void x86_spec_ctrl_set(u64 val) + { +- if (val & ~(SPEC_CTRL_IBRS | SPEC_CTRL_RDS)) ++ if (val & x86_spec_ctrl_mask) + WARN_ONCE(1, "SPEC_CTRL MSR value 0x%16llx is unknown.\n", val); + else + wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base | val); +@@ -459,6 +465,7 @@ static enum ssb_mitigation_cmd __init __ + switch (boot_cpu_data.x86_vendor) { + case X86_VENDOR_INTEL: + x86_spec_ctrl_base |= SPEC_CTRL_RDS; ++ x86_spec_ctrl_mask &= ~SPEC_CTRL_RDS; + x86_spec_ctrl_set(SPEC_CTRL_RDS); + break; + case X86_VENDOR_AMD: +@@ -482,7 +489,7 @@ static void ssb_select_mitigation() + void x86_spec_ctrl_setup_ap(void) + { + if (boot_cpu_has(X86_FEATURE_IBRS)) +- x86_spec_ctrl_set(x86_spec_ctrl_base & (SPEC_CTRL_IBRS | SPEC_CTRL_RDS)); ++ x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask); + } + + #ifdef CONFIG_SYSFS diff --git a/debian/patches/bugfix/x86/ssb/x86-cpu-make-alternative_msr_write-work-for-32-bit-code.patch b/debian/patches/bugfix/x86/ssb/x86-cpu-make-alternative_msr_write-work-for-32-bit-code.patch new file mode 100644 index 000000000..6b7b3bf83 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-cpu-make-alternative_msr_write-work-for-32-bit-code.patch @@ -0,0 +1,37 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Jim Mattson +Date: Sun, 13 May 2018 17:33:57 -0400 +Subject: x86/cpu: Make alternative_msr_write work for 32-bit code + +From: Jim Mattson + +commit 5f2b745f5e1304f438f9b2cd03ebc8120b6e0d3b upstream + +Cast val and (val >> 32) to (u32), so that they fit in a +general-purpose register in both 32-bit and 64-bit code. + +[ tglx: Made it u32 instead of uintptr_t ] + +Fixes: c65732e4f721 ("x86/cpu: Restore CPUID_8000_0008_EBX reload") +Signed-off-by: Jim Mattson +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Acked-by: Linus Torvalds +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -265,8 +265,8 @@ void alternative_msr_write(unsigned int + { + asm volatile(ALTERNATIVE("", "wrmsr", %c[feature]) + : : "c" (msr), +- "a" (val), +- "d" (val >> 32), ++ "a" ((u32)val), ++ "d" ((u32)(val >> 32)), + [feature] "i" (feature) + : "memory"); + } diff --git a/debian/patches/bugfix/x86/ssb/x86-cpufeatures-add-feature_zen.patch b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-add-feature_zen.patch new file mode 100644 index 000000000..c413900bb --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-add-feature_zen.patch @@ -0,0 +1,41 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Thu, 10 May 2018 16:26:00 +0200 +Subject: x86/cpufeatures: Add FEATURE_ZEN + +From: Thomas Gleixner + +commit d1035d971829dcf80e8686ccde26f94b0a069472 upstream + +Add a ZEN feature bit so family-dependent static_cpu_has() optimizations +can be built for ZEN. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 1 + + arch/x86/kernel/cpu/amd.c | 1 + + 2 files changed, 2 insertions(+) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -218,6 +218,7 @@ + #define X86_FEATURE_IBRS ( 7*32+25) /* Indirect Branch Restricted Speculation */ + #define X86_FEATURE_IBPB ( 7*32+26) /* Indirect Branch Prediction Barrier */ + #define X86_FEATURE_STIBP ( 7*32+27) /* Single Thread Indirect Branch Predictors */ ++#define X86_FEATURE_ZEN ( 7*32+28) /* "" CPU is AMD family 0x17 (Zen) */ + + /* Virtualization flags: Linux defined, word 8 */ + #define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */ +--- a/arch/x86/kernel/cpu/amd.c ++++ b/arch/x86/kernel/cpu/amd.c +@@ -812,6 +812,7 @@ static void init_amd_bd(struct cpuinfo_x + + static void init_amd_zn(struct cpuinfo_x86 *c) + { ++ set_cpu_cap(c, X86_FEATURE_ZEN); + /* + * Fix erratum 1076: CPB feature bit not being set in CPUID. It affects + * all up to and including B1. diff --git a/debian/patches/bugfix/x86/ssb/x86-cpufeatures-add-x86_feature_rds.patch b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-add-x86_feature_rds.patch new file mode 100644 index 000000000..8e333ba34 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-add-x86_feature_rds.patch @@ -0,0 +1,32 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Sat, 28 Apr 2018 22:34:17 +0200 +Subject: x86/cpufeatures: Add X86_FEATURE_RDS + +From: Konrad Rzeszutek Wilk + +commit 0cc5fa00b0a88dad140b4e5c2cead9951ad36822 upstream + +Add the CPU feature bit CPUID.7.0.EDX[31] which indicates whether the CPU +supports Reduced Data Speculation. + +[ tglx: Split it out from a later patch ] + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 1 + + 1 file changed, 1 insertion(+) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -333,6 +333,7 @@ + #define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */ + #define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */ + #define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */ ++#define X86_FEATURE_RDS (18*32+31) /* Reduced Data Speculation */ + + /* + * BUG word(s) diff --git a/debian/patches/bugfix/x86/ssb/x86-cpufeatures-disentangle-msr_spec_ctrl-enumeration-from-ibrs.patch b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-disentangle-msr_spec_ctrl-enumeration-from-ibrs.patch new file mode 100644 index 000000000..37e2ffaad --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-disentangle-msr_spec_ctrl-enumeration-from-ibrs.patch @@ -0,0 +1,143 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Thu, 10 May 2018 19:13:18 +0200 +Subject: x86/cpufeatures: Disentangle MSR_SPEC_CTRL enumeration from IBRS + +From: Thomas Gleixner + +commit 7eb8956a7fec3c1f0abc2a5517dada99ccc8a961 upstream + +The availability of the SPEC_CTRL MSR is enumerated by a CPUID bit on +Intel and implied by IBRS or STIBP support on AMD. That's just confusing +and in case an AMD CPU has IBRS not supported because the underlying +problem has been fixed but has another bit valid in the SPEC_CTRL MSR, +the thing falls apart. + +Add a synthetic feature bit X86_FEATURE_MSR_SPEC_CTRL to denote the +availability on both Intel and AMD. + +While at it replace the boot_cpu_has() checks with static_cpu_has() where +possible. This prevents late microcode loading from exposing SPEC_CTRL, but +late loading is already very limited as it does not reevaluate the +mitigation options and other bits and pieces. Having static_cpu_has() is +the simplest and least fragile solution. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 1 + + arch/x86/kernel/cpu/bugs.c | 18 +++++++++++------- + arch/x86/kernel/cpu/common.c | 9 +++++++-- + arch/x86/kernel/cpu/intel.c | 1 + + 4 files changed, 20 insertions(+), 9 deletions(-) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -206,6 +206,7 @@ + #define X86_FEATURE_RETPOLINE_AMD ( 7*32+13) /* "" AMD Retpoline mitigation for Spectre variant 2 */ + #define X86_FEATURE_INTEL_PPIN ( 7*32+14) /* Intel Processor Inventory Number */ + #define X86_FEATURE_CDP_L2 ( 7*32+15) /* Code and Data Prioritization L2 */ ++#define X86_FEATURE_MSR_SPEC_CTRL ( 7*32+16) /* "" MSR SPEC_CTRL is implemented */ + + #define X86_FEATURE_MBA ( 7*32+18) /* Memory Bandwidth Allocation */ + #define X86_FEATURE_RSB_CTXSW ( 7*32+19) /* "" Fill RSB on context switches */ +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -64,7 +64,7 @@ void __init check_bugs(void) + * have unknown values. AMD64_LS_CFG MSR is cached in the early AMD + * init code as it is not enumerated and depends on the family. + */ +- if (boot_cpu_has(X86_FEATURE_IBRS)) ++ if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + rdmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); + + /* Select the proper spectre mitigation before patching alternatives */ +@@ -145,7 +145,7 @@ u64 x86_spec_ctrl_get_default(void) + { + u64 msrval = x86_spec_ctrl_base; + +- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) ++ if (static_cpu_has(X86_FEATURE_SPEC_CTRL)) + msrval |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + return msrval; + } +@@ -155,10 +155,12 @@ void x86_spec_ctrl_set_guest(u64 guest_s + { + u64 host = x86_spec_ctrl_base; + +- if (!boot_cpu_has(X86_FEATURE_IBRS)) ++ /* Is MSR_SPEC_CTRL implemented ? */ ++ if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + return; + +- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) ++ /* Intel controls SSB in MSR_SPEC_CTRL */ ++ if (static_cpu_has(X86_FEATURE_SPEC_CTRL)) + host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + + if (host != guest_spec_ctrl) +@@ -170,10 +172,12 @@ void x86_spec_ctrl_restore_host(u64 gues + { + u64 host = x86_spec_ctrl_base; + +- if (!boot_cpu_has(X86_FEATURE_IBRS)) ++ /* Is MSR_SPEC_CTRL implemented ? */ ++ if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + return; + +- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) ++ /* Intel controls SSB in MSR_SPEC_CTRL */ ++ if (static_cpu_has(X86_FEATURE_SPEC_CTRL)) + host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + + if (host != guest_spec_ctrl) +@@ -631,7 +635,7 @@ int arch_prctl_spec_ctrl_get(struct task + + void x86_spec_ctrl_setup_ap(void) + { +- if (boot_cpu_has(X86_FEATURE_IBRS)) ++ if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask); + + if (ssb_mode == SPEC_STORE_BYPASS_DISABLE) +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -761,19 +761,24 @@ static void init_speculation_control(str + if (cpu_has(c, X86_FEATURE_SPEC_CTRL)) { + set_cpu_cap(c, X86_FEATURE_IBRS); + set_cpu_cap(c, X86_FEATURE_IBPB); ++ set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); + } + + if (cpu_has(c, X86_FEATURE_INTEL_STIBP)) + set_cpu_cap(c, X86_FEATURE_STIBP); + +- if (cpu_has(c, X86_FEATURE_AMD_IBRS)) ++ if (cpu_has(c, X86_FEATURE_AMD_IBRS)) { + set_cpu_cap(c, X86_FEATURE_IBRS); ++ set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); ++ } + + if (cpu_has(c, X86_FEATURE_AMD_IBPB)) + set_cpu_cap(c, X86_FEATURE_IBPB); + +- if (cpu_has(c, X86_FEATURE_AMD_STIBP)) ++ if (cpu_has(c, X86_FEATURE_AMD_STIBP)) { + set_cpu_cap(c, X86_FEATURE_STIBP); ++ set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); ++ } + } + + void get_cpu_cap(struct cpuinfo_x86 *c) +--- a/arch/x86/kernel/cpu/intel.c ++++ b/arch/x86/kernel/cpu/intel.c +@@ -188,6 +188,7 @@ static void early_init_intel(struct cpui + setup_clear_cpu_cap(X86_FEATURE_IBPB); + setup_clear_cpu_cap(X86_FEATURE_STIBP); + setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL); ++ setup_clear_cpu_cap(X86_FEATURE_MSR_SPEC_CTRL); + setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP); + setup_clear_cpu_cap(X86_FEATURE_SSBD); + } diff --git a/debian/patches/bugfix/x86/ssb/x86-cpufeatures-disentangle-ssbd-enumeration.patch b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-disentangle-ssbd-enumeration.patch new file mode 100644 index 000000000..1e91fff30 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-cpufeatures-disentangle-ssbd-enumeration.patch @@ -0,0 +1,150 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Thu, 10 May 2018 20:21:36 +0200 +Subject: x86/cpufeatures: Disentangle SSBD enumeration + +From: Thomas Gleixner + +commit 52817587e706686fcdb27f14c1b000c92f266c96 upstream + +The SSBD enumeration is similarly to the other bits magically shared +between Intel and AMD though the mechanisms are different. + +Make X86_FEATURE_SSBD synthetic and set it depending on the vendor specific +features or family dependent setup. + +Change the Intel bit to X86_FEATURE_SPEC_CTRL_SSBD to denote that SSBD is +controlled via MSR_SPEC_CTRL and fix up the usage sites. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 7 +++---- + arch/x86/kernel/cpu/amd.c | 7 +------ + arch/x86/kernel/cpu/bugs.c | 10 +++++----- + arch/x86/kernel/cpu/common.c | 3 +++ + arch/x86/kernel/cpu/intel.c | 1 + + arch/x86/kernel/process.c | 2 +- + 6 files changed, 14 insertions(+), 16 deletions(-) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -207,15 +207,14 @@ + #define X86_FEATURE_INTEL_PPIN ( 7*32+14) /* Intel Processor Inventory Number */ + #define X86_FEATURE_CDP_L2 ( 7*32+15) /* Code and Data Prioritization L2 */ + #define X86_FEATURE_MSR_SPEC_CTRL ( 7*32+16) /* "" MSR SPEC_CTRL is implemented */ +- ++#define X86_FEATURE_SSBD ( 7*32+17) /* Speculative Store Bypass Disable */ + #define X86_FEATURE_MBA ( 7*32+18) /* Memory Bandwidth Allocation */ + #define X86_FEATURE_RSB_CTXSW ( 7*32+19) /* "" Fill RSB on context switches */ + #define X86_FEATURE_SEV ( 7*32+20) /* AMD Secure Encrypted Virtualization */ +- + #define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */ + #define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */ + #define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */ +-#define X86_FEATURE_AMD_SSBD ( 7*32+24) /* "" AMD SSBD implementation */ ++#define X86_FEATURE_LS_CFG_SSBD ( 7*32+24) /* "" AMD SSBD implementation via LS_CFG MSR */ + #define X86_FEATURE_IBRS ( 7*32+25) /* Indirect Branch Restricted Speculation */ + #define X86_FEATURE_IBPB ( 7*32+26) /* Indirect Branch Prediction Barrier */ + #define X86_FEATURE_STIBP ( 7*32+27) /* Single Thread Indirect Branch Predictors */ +@@ -338,7 +337,7 @@ + #define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */ + #define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */ + #define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */ +-#define X86_FEATURE_SSBD (18*32+31) /* Speculative Store Bypass Disable */ ++#define X86_FEATURE_SPEC_CTRL_SSBD (18*32+31) /* "" Speculative Store Bypass Disable */ + + /* + * BUG word(s) +--- a/arch/x86/kernel/cpu/amd.c ++++ b/arch/x86/kernel/cpu/amd.c +@@ -570,8 +570,8 @@ static void bsp_init_amd(struct cpuinfo_ + * avoid RMW. If that faults, do not enable SSBD. + */ + if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) { ++ setup_force_cpu_cap(X86_FEATURE_LS_CFG_SSBD); + setup_force_cpu_cap(X86_FEATURE_SSBD); +- setup_force_cpu_cap(X86_FEATURE_AMD_SSBD); + x86_amd_ls_cfg_ssbd_mask = 1ULL << bit; + } + } +@@ -919,11 +919,6 @@ static void init_amd(struct cpuinfo_x86 + /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */ + if (!cpu_has(c, X86_FEATURE_XENPV)) + set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); +- +- if (boot_cpu_has(X86_FEATURE_AMD_SSBD)) { +- set_cpu_cap(c, X86_FEATURE_SSBD); +- set_cpu_cap(c, X86_FEATURE_AMD_SSBD); +- } + } + + #ifdef CONFIG_X86_32 +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -159,8 +159,8 @@ void x86_spec_ctrl_set_guest(u64 guest_s + if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + return; + +- /* Intel controls SSB in MSR_SPEC_CTRL */ +- if (static_cpu_has(X86_FEATURE_SPEC_CTRL)) ++ /* SSBD controlled in MSR_SPEC_CTRL */ ++ if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) + host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + + if (host != guest_spec_ctrl) +@@ -176,8 +176,8 @@ void x86_spec_ctrl_restore_host(u64 gues + if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + return; + +- /* Intel controls SSB in MSR_SPEC_CTRL */ +- if (static_cpu_has(X86_FEATURE_SPEC_CTRL)) ++ /* SSBD controlled in MSR_SPEC_CTRL */ ++ if (static_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD)) + host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); + + if (host != guest_spec_ctrl) +@@ -189,7 +189,7 @@ static void x86_amd_ssb_disable(void) + { + u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_ssbd_mask; + +- if (boot_cpu_has(X86_FEATURE_AMD_SSBD)) ++ if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD)) + wrmsrl(MSR_AMD64_LS_CFG, msrval); + } + +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -767,6 +767,9 @@ static void init_speculation_control(str + if (cpu_has(c, X86_FEATURE_INTEL_STIBP)) + set_cpu_cap(c, X86_FEATURE_STIBP); + ++ if (cpu_has(c, X86_FEATURE_SPEC_CTRL_SSBD)) ++ set_cpu_cap(c, X86_FEATURE_SSBD); ++ + if (cpu_has(c, X86_FEATURE_AMD_IBRS)) { + set_cpu_cap(c, X86_FEATURE_IBRS); + set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); +--- a/arch/x86/kernel/cpu/intel.c ++++ b/arch/x86/kernel/cpu/intel.c +@@ -191,6 +191,7 @@ static void early_init_intel(struct cpui + setup_clear_cpu_cap(X86_FEATURE_MSR_SPEC_CTRL); + setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP); + setup_clear_cpu_cap(X86_FEATURE_SSBD); ++ setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL_SSBD); + } + + /* +--- a/arch/x86/kernel/process.c ++++ b/arch/x86/kernel/process.c +@@ -283,7 +283,7 @@ static __always_inline void __speculativ + { + u64 msr; + +- if (static_cpu_has(X86_FEATURE_AMD_SSBD)) { ++ if (static_cpu_has(X86_FEATURE_LS_CFG_SSBD)) { + msr = x86_amd_ls_cfg_base | ssbd_tif_to_amd_ls_cfg(tifn); + wrmsrl(MSR_AMD64_LS_CFG, msr); + } else { diff --git a/debian/patches/bugfix/x86/ssb/x86-kvm-vmx-expose-spec_ctrl-bit-2-to-the-guest.patch b/debian/patches/bugfix/x86/ssb/x86-kvm-vmx-expose-spec_ctrl-bit-2-to-the-guest.patch new file mode 100644 index 000000000..3df24b42f --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-kvm-vmx-expose-spec_ctrl-bit-2-to-the-guest.patch @@ -0,0 +1,64 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Konrad Rzeszutek Wilk +Date: Wed, 25 Apr 2018 22:04:25 -0400 +Subject: x86/KVM/VMX: Expose SPEC_CTRL Bit(2) to the guest + +From: Konrad Rzeszutek Wilk + +commit da39556f66f5cfe8f9c989206974f1cb16ca5d7c upstream + +Expose the CPUID.7.EDX[31] bit to the guest, and also guard against various +combinations of SPEC_CTRL MSR values. + +The handling of the MSR (to take into account the host value of SPEC_CTRL +Bit(2)) is taken care of in patch: + + KVM/SVM/VMX/x86/spectre_v2: Support the combination of guest and host IBRS + +Signed-off-by: Konrad Rzeszutek Wilk +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/kvm/cpuid.c | 2 +- + arch/x86/kvm/vmx.c | 8 +++++--- + 2 files changed, 6 insertions(+), 4 deletions(-) + +--- a/arch/x86/kvm/cpuid.c ++++ b/arch/x86/kvm/cpuid.c +@@ -402,7 +402,7 @@ static inline int __do_cpuid_ent(struct + + /* cpuid 7.0.edx*/ + const u32 kvm_cpuid_7_0_edx_x86_features = +- F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | ++ F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(RDS) | + F(ARCH_CAPABILITIES); + + /* all calls to cpuid_count() should be made on the same cpu */ +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -3270,7 +3270,8 @@ static int vmx_get_msr(struct kvm_vcpu * + case MSR_IA32_SPEC_CTRL: + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_IBRS) && +- !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) && ++ !guest_cpuid_has(vcpu, X86_FEATURE_RDS)) + return 1; + + msr_info->data = to_vmx(vcpu)->spec_ctrl; +@@ -3391,11 +3392,12 @@ static int vmx_set_msr(struct kvm_vcpu * + case MSR_IA32_SPEC_CTRL: + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_IBRS) && +- !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) && ++ !guest_cpuid_has(vcpu, X86_FEATURE_RDS)) + return 1; + + /* The STIBP bit doesn't fault even if it's not advertised */ +- if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP)) ++ if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP | SPEC_CTRL_RDS)) + return 1; + + vmx->spec_ctrl = data; diff --git a/debian/patches/bugfix/x86/ssb/x86-nospec-simplify-alternative_msr_write.patch b/debian/patches/bugfix/x86/ssb/x86-nospec-simplify-alternative_msr_write.patch new file mode 100644 index 000000000..51e8d5247 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-nospec-simplify-alternative_msr_write.patch @@ -0,0 +1,67 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Linus Torvalds +Date: Tue, 1 May 2018 15:55:51 +0200 +Subject: x86/nospec: Simplify alternative_msr_write() + +From: Linus Torvalds + +commit 1aa7a5735a41418d8e01fa7c9565eb2657e2ea3f upstream + +The macro is not type safe and I did look for why that "g" constraint for +the asm doesn't work: it's because the asm is more fundamentally wrong. + +It does + + movl %[val], %%eax + +but "val" isn't a 32-bit value, so then gcc will pass it in a register, +and generate code like + + movl %rsi, %eax + +and gas will complain about a nonsensical 'mov' instruction (it's moving a +64-bit register to a 32-bit one). + +Passing it through memory will just hide the real bug - gcc still thinks +the memory location is 64-bit, but the "movl" will only load the first 32 +bits and it all happens to work because x86 is little-endian. + +Convert it to a type safe inline function with a little trick which hands +the feature into the ALTERNATIVE macro. + +Signed-off-by: Linus Torvalds +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 19 ++++++++++--------- + 1 file changed, 10 insertions(+), 9 deletions(-) + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -241,15 +241,16 @@ static inline void vmexit_fill_RSB(void) + #endif + } + +-#define alternative_msr_write(_msr, _val, _feature) \ +- asm volatile(ALTERNATIVE("", \ +- "movl %[msr], %%ecx\n\t" \ +- "movl %[val], %%eax\n\t" \ +- "movl $0, %%edx\n\t" \ +- "wrmsr", \ +- _feature) \ +- : : [msr] "i" (_msr), [val] "i" (_val) \ +- : "eax", "ecx", "edx", "memory") ++static __always_inline ++void alternative_msr_write(unsigned int msr, u64 val, unsigned int feature) ++{ ++ asm volatile(ALTERNATIVE("", "wrmsr", %c[feature]) ++ : : "c" (msr), ++ "a" (val), ++ "d" (val >> 32), ++ [feature] "i" (feature) ++ : "memory"); ++} + + static inline void indirect_branch_prediction_barrier(void) + { diff --git a/debian/patches/bugfix/x86/ssb/x86-process-allow-runtime-control-of-speculative-store-bypass.patch b/debian/patches/bugfix/x86/ssb/x86-process-allow-runtime-control-of-speculative-store-bypass.patch new file mode 100644 index 000000000..addd2f5af --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-process-allow-runtime-control-of-speculative-store-bypass.patch @@ -0,0 +1,213 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sun, 29 Apr 2018 15:21:42 +0200 +Subject: x86/process: Allow runtime control of Speculative Store Bypass + +From: Thomas Gleixner + +commit 885f82bfbc6fefb6664ea27965c3ab9ac4194b8c upstream + +The Speculative Store Bypass vulnerability can be mitigated with the +Reduced Data Speculation (RDS) feature. To allow finer grained control of +this eventually expensive mitigation a per task mitigation control is +required. + +Add a new TIF_RDS flag and put it into the group of TIF flags which are +evaluated for mismatch in switch_to(). If these bits differ in the previous +and the next task, then the slow path function __switch_to_xtra() is +invoked. Implement the TIF_RDS dependent mitigation control in the slow +path. + +If the prctl for controlling Speculative Store Bypass is disabled or no +task uses the prctl then there is no overhead in the switch_to() fast +path. + +Update the KVM related speculation control functions to take TID_RDS into +account as well. + +Based on a patch from Tim Chen. Completely rewritten. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Ingo Molnar +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/msr-index.h | 3 ++- + arch/x86/include/asm/spec-ctrl.h | 17 +++++++++++++++++ + arch/x86/include/asm/thread_info.h | 4 +++- + arch/x86/kernel/cpu/bugs.c | 26 +++++++++++++++++++++----- + arch/x86/kernel/process.c | 22 ++++++++++++++++++++++ + 5 files changed, 65 insertions(+), 7 deletions(-) + +--- a/arch/x86/include/asm/msr-index.h ++++ b/arch/x86/include/asm/msr-index.h +@@ -42,7 +42,8 @@ + #define MSR_IA32_SPEC_CTRL 0x00000048 /* Speculation Control */ + #define SPEC_CTRL_IBRS (1 << 0) /* Indirect Branch Restricted Speculation */ + #define SPEC_CTRL_STIBP (1 << 1) /* Single Thread Indirect Branch Predictors */ +-#define SPEC_CTRL_RDS (1 << 2) /* Reduced Data Speculation */ ++#define SPEC_CTRL_RDS_SHIFT 2 /* Reduced Data Speculation bit */ ++#define SPEC_CTRL_RDS (1 << SPEC_CTRL_RDS_SHIFT) /* Reduced Data Speculation */ + + #define MSR_IA32_PRED_CMD 0x00000049 /* Prediction Command */ + #define PRED_CMD_IBPB (1 << 0) /* Indirect Branch Prediction Barrier */ +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -2,6 +2,7 @@ + #ifndef _ASM_X86_SPECCTRL_H_ + #define _ASM_X86_SPECCTRL_H_ + ++#include + #include + + /* +@@ -18,4 +19,20 @@ extern void x86_spec_ctrl_restore_host(u + extern u64 x86_amd_ls_cfg_base; + extern u64 x86_amd_ls_cfg_rds_mask; + ++/* The Intel SPEC CTRL MSR base value cache */ ++extern u64 x86_spec_ctrl_base; ++ ++static inline u64 rds_tif_to_spec_ctrl(u64 tifn) ++{ ++ BUILD_BUG_ON(TIF_RDS < SPEC_CTRL_RDS_SHIFT); ++ return (tifn & _TIF_RDS) >> (TIF_RDS - SPEC_CTRL_RDS_SHIFT); ++} ++ ++static inline u64 rds_tif_to_amd_ls_cfg(u64 tifn) ++{ ++ return (tifn & _TIF_RDS) ? x86_amd_ls_cfg_rds_mask : 0ULL; ++} ++ ++extern void speculative_store_bypass_update(void); ++ + #endif +--- a/arch/x86/include/asm/thread_info.h ++++ b/arch/x86/include/asm/thread_info.h +@@ -79,6 +79,7 @@ struct thread_info { + #define TIF_SIGPENDING 2 /* signal pending */ + #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ + #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ ++#define TIF_RDS 5 /* Reduced data speculation */ + #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ + #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ + #define TIF_SECCOMP 8 /* secure computing */ +@@ -105,6 +106,7 @@ struct thread_info { + #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) + #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) + #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) ++#define _TIF_RDS (1 << TIF_RDS) + #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) + #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) + #define _TIF_SECCOMP (1 << TIF_SECCOMP) +@@ -144,7 +146,7 @@ struct thread_info { + + /* flags to check in __switch_to() */ + #define _TIF_WORK_CTXSW \ +- (_TIF_IO_BITMAP|_TIF_NOCPUID|_TIF_NOTSC|_TIF_BLOCKSTEP) ++ (_TIF_IO_BITMAP|_TIF_NOCPUID|_TIF_NOTSC|_TIF_BLOCKSTEP|_TIF_RDS) + + #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) + #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -33,7 +33,7 @@ static void __init ssb_select_mitigation + * Our boot-time value of the SPEC_CTRL MSR. We read it once so that any + * writes to SPEC_CTRL contain whatever reserved bits have been set. + */ +-static u64 __ro_after_init x86_spec_ctrl_base; ++u64 __ro_after_init x86_spec_ctrl_base; + + /* + * The vendor and possibly platform specific bits which can be modified in +@@ -140,25 +140,41 @@ EXPORT_SYMBOL_GPL(x86_spec_ctrl_set); + + u64 x86_spec_ctrl_get_default(void) + { +- return x86_spec_ctrl_base; ++ u64 msrval = x86_spec_ctrl_base; ++ ++ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) ++ msrval |= rds_tif_to_spec_ctrl(current_thread_info()->flags); ++ return msrval; + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); + + void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl) + { ++ u64 host = x86_spec_ctrl_base; ++ + if (!boot_cpu_has(X86_FEATURE_IBRS)) + return; +- if (x86_spec_ctrl_base != guest_spec_ctrl) ++ ++ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) ++ host |= rds_tif_to_spec_ctrl(current_thread_info()->flags); ++ ++ if (host != guest_spec_ctrl) + wrmsrl(MSR_IA32_SPEC_CTRL, guest_spec_ctrl); + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_set_guest); + + void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl) + { ++ u64 host = x86_spec_ctrl_base; ++ + if (!boot_cpu_has(X86_FEATURE_IBRS)) + return; +- if (x86_spec_ctrl_base != guest_spec_ctrl) +- wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); ++ ++ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) ++ host |= rds_tif_to_spec_ctrl(current_thread_info()->flags); ++ ++ if (host != guest_spec_ctrl) ++ wrmsrl(MSR_IA32_SPEC_CTRL, host); + } + EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); + +--- a/arch/x86/kernel/process.c ++++ b/arch/x86/kernel/process.c +@@ -38,6 +38,7 @@ + #include + #include + #include ++#include + + /* + * per-CPU TSS segments. Threads are completely 'soft' on Linux, +@@ -278,6 +279,24 @@ static inline void switch_to_bitmap(stru + } + } + ++static __always_inline void __speculative_store_bypass_update(unsigned long tifn) ++{ ++ u64 msr; ++ ++ if (static_cpu_has(X86_FEATURE_AMD_RDS)) { ++ msr = x86_amd_ls_cfg_base | rds_tif_to_amd_ls_cfg(tifn); ++ wrmsrl(MSR_AMD64_LS_CFG, msr); ++ } else { ++ msr = x86_spec_ctrl_base | rds_tif_to_spec_ctrl(tifn); ++ wrmsrl(MSR_IA32_SPEC_CTRL, msr); ++ } ++} ++ ++void speculative_store_bypass_update(void) ++{ ++ __speculative_store_bypass_update(current_thread_info()->flags); ++} ++ + void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p, + struct tss_struct *tss) + { +@@ -309,6 +328,9 @@ void __switch_to_xtra(struct task_struct + + if ((tifp ^ tifn) & _TIF_NOCPUID) + set_cpuid_faulting(!!(tifn & _TIF_NOCPUID)); ++ ++ if ((tifp ^ tifn) & _TIF_RDS) ++ __speculative_store_bypass_update(tifn); + } + + /* diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-add-prctl-for-speculative-store-bypass-mitigation.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-add-prctl-for-speculative-store-bypass-mitigation.patch new file mode 100644 index 000000000..25db57ac1 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-add-prctl-for-speculative-store-bypass-mitigation.patch @@ -0,0 +1,212 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sun, 29 Apr 2018 15:26:40 +0200 +Subject: x86/speculation: Add prctl for Speculative Store Bypass mitigation + +From: Thomas Gleixner + +commit a73ec77ee17ec556fe7f165d00314cb7c047b1ac upstream + +Add prctl based control for Speculative Store Bypass mitigation and make it +the default mitigation for Intel and AMD. + +Andi Kleen provided the following rationale (slightly redacted): + + There are multiple levels of impact of Speculative Store Bypass: + + 1) JITed sandbox. + It cannot invoke system calls, but can do PRIME+PROBE and may have call + interfaces to other code + + 2) Native code process. + No protection inside the process at this level. + + 3) Kernel. + + 4) Between processes. + + The prctl tries to protect against case (1) doing attacks. + + If the untrusted code can do random system calls then control is already + lost in a much worse way. So there needs to be system call protection in + some way (using a JIT not allowing them or seccomp). Or rather if the + process can subvert its environment somehow to do the prctl it can already + execute arbitrary code, which is much worse than SSB. + + To put it differently, the point of the prctl is to not allow JITed code + to read data it shouldn't read from its JITed sandbox. If it already has + escaped its sandbox then it can already read everything it wants in its + address space, and do much worse. + + The ability to control Speculative Store Bypass allows to enable the + protection selectively without affecting overall system performance. + +Based on an initial patch from Tim Chen. Completely rewritten. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/admin-guide/kernel-parameters.txt | 6 + + arch/x86/include/asm/nospec-branch.h | 1 + arch/x86/kernel/cpu/bugs.c | 83 +++++++++++++++++++++--- + 3 files changed, 79 insertions(+), 11 deletions(-) + +--- a/Documentation/admin-guide/kernel-parameters.txt ++++ b/Documentation/admin-guide/kernel-parameters.txt +@@ -4025,7 +4025,11 @@ + off - Unconditionally enable Speculative Store Bypass + auto - Kernel detects whether the CPU model contains an + implementation of Speculative Store Bypass and +- picks the most appropriate mitigation ++ picks the most appropriate mitigation. ++ prctl - Control Speculative Store Bypass per thread ++ via prctl. Speculative Store Bypass is enabled ++ for a process by default. The state of the control ++ is inherited on fork. + + Not specifying this option is equivalent to + spec_store_bypass_disable=auto. +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -232,6 +232,7 @@ extern u64 x86_spec_ctrl_get_default(voi + enum ssb_mitigation { + SPEC_STORE_BYPASS_NONE, + SPEC_STORE_BYPASS_DISABLE, ++ SPEC_STORE_BYPASS_PRCTL, + }; + + extern char __indirect_thunk_start[]; +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -12,6 +12,8 @@ + #include + #include + #include ++#include ++#include + + #include + #include +@@ -412,20 +414,23 @@ enum ssb_mitigation_cmd { + SPEC_STORE_BYPASS_CMD_NONE, + SPEC_STORE_BYPASS_CMD_AUTO, + SPEC_STORE_BYPASS_CMD_ON, ++ SPEC_STORE_BYPASS_CMD_PRCTL, + }; + + static const char *ssb_strings[] = { + [SPEC_STORE_BYPASS_NONE] = "Vulnerable", +- [SPEC_STORE_BYPASS_DISABLE] = "Mitigation: Speculative Store Bypass disabled" ++ [SPEC_STORE_BYPASS_DISABLE] = "Mitigation: Speculative Store Bypass disabled", ++ [SPEC_STORE_BYPASS_PRCTL] = "Mitigation: Speculative Store Bypass disabled via prctl" + }; + + static const struct { + const char *option; + enum ssb_mitigation_cmd cmd; + } ssb_mitigation_options[] = { +- { "auto", SPEC_STORE_BYPASS_CMD_AUTO }, /* Platform decides */ +- { "on", SPEC_STORE_BYPASS_CMD_ON }, /* Disable Speculative Store Bypass */ +- { "off", SPEC_STORE_BYPASS_CMD_NONE }, /* Don't touch Speculative Store Bypass */ ++ { "auto", SPEC_STORE_BYPASS_CMD_AUTO }, /* Platform decides */ ++ { "on", SPEC_STORE_BYPASS_CMD_ON }, /* Disable Speculative Store Bypass */ ++ { "off", SPEC_STORE_BYPASS_CMD_NONE }, /* Don't touch Speculative Store Bypass */ ++ { "prctl", SPEC_STORE_BYPASS_CMD_PRCTL }, /* Disable Speculative Store Bypass via prctl */ + }; + + static enum ssb_mitigation_cmd __init ssb_parse_cmdline(void) +@@ -475,14 +480,15 @@ static enum ssb_mitigation_cmd __init __ + + switch (cmd) { + case SPEC_STORE_BYPASS_CMD_AUTO: +- /* +- * AMD platforms by default don't need SSB mitigation. +- */ +- if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) +- break; ++ /* Choose prctl as the default mode */ ++ mode = SPEC_STORE_BYPASS_PRCTL; ++ break; + case SPEC_STORE_BYPASS_CMD_ON: + mode = SPEC_STORE_BYPASS_DISABLE; + break; ++ case SPEC_STORE_BYPASS_CMD_PRCTL: ++ mode = SPEC_STORE_BYPASS_PRCTL; ++ break; + case SPEC_STORE_BYPASS_CMD_NONE: + break; + } +@@ -493,7 +499,7 @@ static enum ssb_mitigation_cmd __init __ + * - X86_FEATURE_RDS - CPU is able to turn off speculative store bypass + * - X86_FEATURE_SPEC_STORE_BYPASS_DISABLE - engage the mitigation + */ +- if (mode != SPEC_STORE_BYPASS_NONE) { ++ if (mode == SPEC_STORE_BYPASS_DISABLE) { + setup_force_cpu_cap(X86_FEATURE_SPEC_STORE_BYPASS_DISABLE); + /* + * Intel uses the SPEC CTRL MSR Bit(2) for this, while AMD uses +@@ -524,6 +530,63 @@ static void ssb_select_mitigation() + + #undef pr_fmt + ++static int ssb_prctl_set(unsigned long ctrl) ++{ ++ bool rds = !!test_tsk_thread_flag(current, TIF_RDS); ++ ++ if (ssb_mode != SPEC_STORE_BYPASS_PRCTL) ++ return -ENXIO; ++ ++ if (ctrl == PR_SPEC_ENABLE) ++ clear_tsk_thread_flag(current, TIF_RDS); ++ else ++ set_tsk_thread_flag(current, TIF_RDS); ++ ++ if (rds != !!test_tsk_thread_flag(current, TIF_RDS)) ++ speculative_store_bypass_update(); ++ ++ return 0; ++} ++ ++static int ssb_prctl_get(void) ++{ ++ switch (ssb_mode) { ++ case SPEC_STORE_BYPASS_DISABLE: ++ return PR_SPEC_DISABLE; ++ case SPEC_STORE_BYPASS_PRCTL: ++ if (test_tsk_thread_flag(current, TIF_RDS)) ++ return PR_SPEC_PRCTL | PR_SPEC_DISABLE; ++ return PR_SPEC_PRCTL | PR_SPEC_ENABLE; ++ default: ++ if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) ++ return PR_SPEC_ENABLE; ++ return PR_SPEC_NOT_AFFECTED; ++ } ++} ++ ++int arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl) ++{ ++ if (ctrl != PR_SPEC_ENABLE && ctrl != PR_SPEC_DISABLE) ++ return -ERANGE; ++ ++ switch (which) { ++ case PR_SPEC_STORE_BYPASS: ++ return ssb_prctl_set(ctrl); ++ default: ++ return -ENODEV; ++ } ++} ++ ++int arch_prctl_spec_ctrl_get(unsigned long which) ++{ ++ switch (which) { ++ case PR_SPEC_STORE_BYPASS: ++ return ssb_prctl_get(); ++ default: ++ return -ENODEV; ++ } ++} ++ + void x86_spec_ctrl_setup_ap(void) + { + if (boot_cpu_has(X86_FEATURE_IBRS)) diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-add-virtualized-speculative-store-bypass-disable-support.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-add-virtualized-speculative-store-bypass-disable-support.patch new file mode 100644 index 000000000..38b72e416 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-add-virtualized-speculative-store-bypass-disable-support.patch @@ -0,0 +1,93 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Tom Lendacky +Date: Thu, 17 May 2018 17:09:18 +0200 +Subject: x86/speculation: Add virtualized speculative store bypass disable support + +From: Tom Lendacky + +commit 11fb0683493b2da112cd64c9dada221b52463bf7 upstream + +Some AMD processors only support a non-architectural means of enabling +speculative store bypass disable (SSBD). To allow a simplified view of +this to a guest, an architectural definition has been created through a new +CPUID bit, 0x80000008_EBX[25], and a new MSR, 0xc001011f. With this, a +hypervisor can virtualize the existence of this definition and provide an +architectural method for using SSBD to a guest. + +Add the new CPUID feature, the new MSR and update the existing SSBD +support to use this MSR when present. + +Signed-off-by: Tom Lendacky +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 1 + + arch/x86/include/asm/msr-index.h | 2 ++ + arch/x86/kernel/cpu/bugs.c | 4 +++- + arch/x86/kernel/process.c | 13 ++++++++++++- + 4 files changed, 18 insertions(+), 2 deletions(-) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -282,6 +282,7 @@ + #define X86_FEATURE_AMD_IBPB (13*32+12) /* "" Indirect Branch Prediction Barrier */ + #define X86_FEATURE_AMD_IBRS (13*32+14) /* "" Indirect Branch Restricted Speculation */ + #define X86_FEATURE_AMD_STIBP (13*32+15) /* "" Single Thread Indirect Branch Predictors */ ++#define X86_FEATURE_VIRT_SSBD (13*32+25) /* Virtualized Speculative Store Bypass Disable */ + + /* Thermal and Power Management Leaf, CPUID level 0x00000006 (EAX), word 14 */ + #define X86_FEATURE_DTHERM (14*32+ 0) /* Digital Thermal Sensor */ +--- a/arch/x86/include/asm/msr-index.h ++++ b/arch/x86/include/asm/msr-index.h +@@ -347,6 +347,8 @@ + #define MSR_AMD64_SEV_ENABLED_BIT 0 + #define MSR_AMD64_SEV_ENABLED BIT_ULL(MSR_AMD64_SEV_ENABLED_BIT) + ++#define MSR_AMD64_VIRT_SPEC_CTRL 0xc001011f ++ + /* Fam 17h MSRs */ + #define MSR_F17H_IRPERF 0xc00000e9 + +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -205,7 +205,9 @@ static void x86_amd_ssb_disable(void) + { + u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_ssbd_mask; + +- if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD)) ++ if (boot_cpu_has(X86_FEATURE_VIRT_SSBD)) ++ wrmsrl(MSR_AMD64_VIRT_SPEC_CTRL, SPEC_CTRL_SSBD); ++ else if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD)) + wrmsrl(MSR_AMD64_LS_CFG, msrval); + } + +--- a/arch/x86/kernel/process.c ++++ b/arch/x86/kernel/process.c +@@ -388,6 +388,15 @@ static __always_inline void amd_set_core + } + #endif + ++static __always_inline void amd_set_ssb_virt_state(unsigned long tifn) ++{ ++ /* ++ * SSBD has the same definition in SPEC_CTRL and VIRT_SPEC_CTRL, ++ * so ssbd_tif_to_spec_ctrl() just works. ++ */ ++ wrmsrl(MSR_AMD64_VIRT_SPEC_CTRL, ssbd_tif_to_spec_ctrl(tifn)); ++} ++ + static __always_inline void intel_set_ssb_state(unsigned long tifn) + { + u64 msr = x86_spec_ctrl_base | ssbd_tif_to_spec_ctrl(tifn); +@@ -397,7 +406,9 @@ static __always_inline void intel_set_ss + + static __always_inline void __speculative_store_bypass_update(unsigned long tifn) + { +- if (static_cpu_has(X86_FEATURE_LS_CFG_SSBD)) ++ if (static_cpu_has(X86_FEATURE_VIRT_SSBD)) ++ amd_set_ssb_virt_state(tifn); ++ else if (static_cpu_has(X86_FEATURE_LS_CFG_SSBD)) + amd_set_core_ssb_state(tifn); + else + intel_set_ssb_state(tifn); diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-create-spec-ctrl.h-to-avoid-include-hell.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-create-spec-ctrl.h-to-avoid-include-hell.patch new file mode 100644 index 000000000..e7a7264ac --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-create-spec-ctrl.h-to-avoid-include-hell.patch @@ -0,0 +1,125 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Sun, 29 Apr 2018 15:01:37 +0200 +Subject: x86/speculation: Create spec-ctrl.h to avoid include hell + +From: Thomas Gleixner + +commit 28a2775217b17208811fa43a9e96bd1fdf417b86 upstream + +Having everything in nospec-branch.h creates a hell of dependencies when +adding the prctl based switching mechanism. Move everything which is not +required in nospec-branch.h to spec-ctrl.h and fix up the includes in the +relevant files. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Konrad Rzeszutek Wilk +Reviewed-by: Ingo Molnar +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/nospec-branch.h | 14 -------------- + arch/x86/include/asm/spec-ctrl.h | 21 +++++++++++++++++++++ + arch/x86/kernel/cpu/amd.c | 2 +- + arch/x86/kernel/cpu/bugs.c | 2 +- + arch/x86/kvm/svm.c | 2 +- + arch/x86/kvm/vmx.c | 2 +- + 6 files changed, 25 insertions(+), 18 deletions(-) + create mode 100644 arch/x86/include/asm/spec-ctrl.h + +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -228,26 +228,12 @@ enum spectre_v2_mitigation { + extern void x86_spec_ctrl_set(u64); + extern u64 x86_spec_ctrl_get_default(void); + +-/* +- * On VMENTER we must preserve whatever view of the SPEC_CTRL MSR +- * the guest has, while on VMEXIT we restore the host view. This +- * would be easier if SPEC_CTRL were architecturally maskable or +- * shadowable for guests but this is not (currently) the case. +- * Takes the guest view of SPEC_CTRL MSR as a parameter. +- */ +-extern void x86_spec_ctrl_set_guest(u64); +-extern void x86_spec_ctrl_restore_host(u64); +- + /* The Speculative Store Bypass disable variants */ + enum ssb_mitigation { + SPEC_STORE_BYPASS_NONE, + SPEC_STORE_BYPASS_DISABLE, + }; + +-/* AMD specific Speculative Store Bypass MSR data */ +-extern u64 x86_amd_ls_cfg_base; +-extern u64 x86_amd_ls_cfg_rds_mask; +- + extern char __indirect_thunk_start[]; + extern char __indirect_thunk_end[]; + +--- /dev/null ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -0,0 +1,21 @@ ++/* SPDX-License-Identifier: GPL-2.0 */ ++#ifndef _ASM_X86_SPECCTRL_H_ ++#define _ASM_X86_SPECCTRL_H_ ++ ++#include ++ ++/* ++ * On VMENTER we must preserve whatever view of the SPEC_CTRL MSR ++ * the guest has, while on VMEXIT we restore the host view. This ++ * would be easier if SPEC_CTRL were architecturally maskable or ++ * shadowable for guests but this is not (currently) the case. ++ * Takes the guest view of SPEC_CTRL MSR as a parameter. ++ */ ++extern void x86_spec_ctrl_set_guest(u64); ++extern void x86_spec_ctrl_restore_host(u64); ++ ++/* AMD specific Speculative Store Bypass MSR data */ ++extern u64 x86_amd_ls_cfg_base; ++extern u64 x86_amd_ls_cfg_rds_mask; ++ ++#endif +--- a/arch/x86/kernel/cpu/amd.c ++++ b/arch/x86/kernel/cpu/amd.c +@@ -10,7 +10,7 @@ + #include + #include + #include +-#include ++#include + #include + #include + #include +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -13,7 +13,7 @@ + #include + #include + +-#include ++#include + #include + #include + #include +--- a/arch/x86/kvm/svm.c ++++ b/arch/x86/kvm/svm.c +@@ -50,7 +50,7 @@ + #include + #include + #include +-#include ++#include + + #include + #include "trace.h" +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -52,7 +52,7 @@ + #include + #include + #include +-#include ++#include + + #include "trace.h" + #include "pmu.h" diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-handle-ht-correctly-on-amd.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-handle-ht-correctly-on-amd.patch new file mode 100644 index 000000000..b532e525e --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-handle-ht-correctly-on-amd.patch @@ -0,0 +1,232 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Wed, 9 May 2018 21:53:09 +0200 +Subject: x86/speculation: Handle HT correctly on AMD + +From: Thomas Gleixner + +commit 1f50ddb4f4189243c05926b842dc1a0332195f31 upstream + +The AMD64_LS_CFG MSR is a per core MSR on Family 17H CPUs. That means when +hyperthreading is enabled the SSBD bit toggle needs to take both cores into +account. Otherwise the following situation can happen: + +CPU0 CPU1 + +disable SSB + disable SSB + enable SSB <- Enables it for the Core, i.e. for CPU0 as well + +So after the SSB enable on CPU1 the task on CPU0 runs with SSB enabled +again. + +On Intel the SSBD control is per core as well, but the synchronization +logic is implemented behind the per thread SPEC_CTRL MSR. It works like +this: + + CORE_SPEC_CTRL = THREAD0_SPEC_CTRL | THREAD1_SPEC_CTRL + +i.e. if one of the threads enables a mitigation then this affects both and +the mitigation is only disabled in the core when both threads disabled it. + +Add the necessary synchronization logic for AMD family 17H. Unfortunately +that requires a spinlock to serialize the access to the MSR, but the locks +are only shared between siblings. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/spec-ctrl.h | 6 + + arch/x86/kernel/process.c | 125 +++++++++++++++++++++++++++++++++++++-- + arch/x86/kernel/smpboot.c | 5 + + 3 files changed, 130 insertions(+), 6 deletions(-) + +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -33,6 +33,12 @@ static inline u64 ssbd_tif_to_amd_ls_cfg + return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL; + } + ++#ifdef CONFIG_SMP ++extern void speculative_store_bypass_ht_init(void); ++#else ++static inline void speculative_store_bypass_ht_init(void) { } ++#endif ++ + extern void speculative_store_bypass_update(void); + + #endif +--- a/arch/x86/kernel/process.c ++++ b/arch/x86/kernel/process.c +@@ -279,22 +279,135 @@ static inline void switch_to_bitmap(stru + } + } + +-static __always_inline void __speculative_store_bypass_update(unsigned long tifn) ++#ifdef CONFIG_SMP ++ ++struct ssb_state { ++ struct ssb_state *shared_state; ++ raw_spinlock_t lock; ++ unsigned int disable_state; ++ unsigned long local_state; ++}; ++ ++#define LSTATE_SSB 0 ++ ++static DEFINE_PER_CPU(struct ssb_state, ssb_state); ++ ++void speculative_store_bypass_ht_init(void) ++{ ++ struct ssb_state *st = this_cpu_ptr(&ssb_state); ++ unsigned int this_cpu = smp_processor_id(); ++ unsigned int cpu; ++ ++ st->local_state = 0; ++ ++ /* ++ * Shared state setup happens once on the first bringup ++ * of the CPU. It's not destroyed on CPU hotunplug. ++ */ ++ if (st->shared_state) ++ return; ++ ++ raw_spin_lock_init(&st->lock); ++ ++ /* ++ * Go over HT siblings and check whether one of them has set up the ++ * shared state pointer already. ++ */ ++ for_each_cpu(cpu, topology_sibling_cpumask(this_cpu)) { ++ if (cpu == this_cpu) ++ continue; ++ ++ if (!per_cpu(ssb_state, cpu).shared_state) ++ continue; ++ ++ /* Link it to the state of the sibling: */ ++ st->shared_state = per_cpu(ssb_state, cpu).shared_state; ++ return; ++ } ++ ++ /* ++ * First HT sibling to come up on the core. Link shared state of ++ * the first HT sibling to itself. The siblings on the same core ++ * which come up later will see the shared state pointer and link ++ * themself to the state of this CPU. ++ */ ++ st->shared_state = st; ++} ++ ++/* ++ * Logic is: First HT sibling enables SSBD for both siblings in the core ++ * and last sibling to disable it, disables it for the whole core. This how ++ * MSR_SPEC_CTRL works in "hardware": ++ * ++ * CORE_SPEC_CTRL = THREAD0_SPEC_CTRL | THREAD1_SPEC_CTRL ++ */ ++static __always_inline void amd_set_core_ssb_state(unsigned long tifn) + { +- u64 msr; ++ struct ssb_state *st = this_cpu_ptr(&ssb_state); ++ u64 msr = x86_amd_ls_cfg_base; + +- if (static_cpu_has(X86_FEATURE_LS_CFG_SSBD)) { +- msr = x86_amd_ls_cfg_base | ssbd_tif_to_amd_ls_cfg(tifn); ++ if (!static_cpu_has(X86_FEATURE_ZEN)) { ++ msr |= ssbd_tif_to_amd_ls_cfg(tifn); + wrmsrl(MSR_AMD64_LS_CFG, msr); ++ return; ++ } ++ ++ if (tifn & _TIF_SSBD) { ++ /* ++ * Since this can race with prctl(), block reentry on the ++ * same CPU. ++ */ ++ if (__test_and_set_bit(LSTATE_SSB, &st->local_state)) ++ return; ++ ++ msr |= x86_amd_ls_cfg_ssbd_mask; ++ ++ raw_spin_lock(&st->shared_state->lock); ++ /* First sibling enables SSBD: */ ++ if (!st->shared_state->disable_state) ++ wrmsrl(MSR_AMD64_LS_CFG, msr); ++ st->shared_state->disable_state++; ++ raw_spin_unlock(&st->shared_state->lock); + } else { +- msr = x86_spec_ctrl_base | ssbd_tif_to_spec_ctrl(tifn); +- wrmsrl(MSR_IA32_SPEC_CTRL, msr); ++ if (!__test_and_clear_bit(LSTATE_SSB, &st->local_state)) ++ return; ++ ++ raw_spin_lock(&st->shared_state->lock); ++ st->shared_state->disable_state--; ++ if (!st->shared_state->disable_state) ++ wrmsrl(MSR_AMD64_LS_CFG, msr); ++ raw_spin_unlock(&st->shared_state->lock); + } + } ++#else ++static __always_inline void amd_set_core_ssb_state(unsigned long tifn) ++{ ++ u64 msr = x86_amd_ls_cfg_base | ssbd_tif_to_amd_ls_cfg(tifn); ++ ++ wrmsrl(MSR_AMD64_LS_CFG, msr); ++} ++#endif ++ ++static __always_inline void intel_set_ssb_state(unsigned long tifn) ++{ ++ u64 msr = x86_spec_ctrl_base | ssbd_tif_to_spec_ctrl(tifn); ++ ++ wrmsrl(MSR_IA32_SPEC_CTRL, msr); ++} ++ ++static __always_inline void __speculative_store_bypass_update(unsigned long tifn) ++{ ++ if (static_cpu_has(X86_FEATURE_LS_CFG_SSBD)) ++ amd_set_core_ssb_state(tifn); ++ else ++ intel_set_ssb_state(tifn); ++} + + void speculative_store_bypass_update(void) + { ++ preempt_disable(); + __speculative_store_bypass_update(current_thread_info()->flags); ++ preempt_enable(); + } + + void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p, +--- a/arch/x86/kernel/smpboot.c ++++ b/arch/x86/kernel/smpboot.c +@@ -77,6 +77,7 @@ + #include + #include + #include ++#include + + /* Number of siblings per CPU package */ + int smp_num_siblings = 1; +@@ -242,6 +243,8 @@ static void notrace start_secondary(void + */ + check_tsc_sync_target(); + ++ speculative_store_bypass_ht_init(); ++ + /* + * Lock vector_lock, set CPU online and bring the vector + * allocator online. Online must be set with vector_lock held +@@ -1257,6 +1260,8 @@ void __init native_smp_prepare_cpus(unsi + set_mtrr_aps_delayed_init(); + + smp_quirk_init_udelay(); ++ ++ speculative_store_bypass_ht_init(); + } + + void arch_enable_nonboot_cpus_begin(void) diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-kvm-implement-support-for-virt_spec_ctrl-ls_cfg.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-kvm-implement-support-for-virt_spec_ctrl-ls_cfg.patch new file mode 100644 index 000000000..ee9ebcfcc --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-kvm-implement-support-for-virt_spec_ctrl-ls_cfg.patch @@ -0,0 +1,77 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Thu, 10 May 2018 20:42:48 +0200 +Subject: x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG + +From: Thomas Gleixner + +commit 47c61b3955cf712cadfc25635bf9bc174af030ea upstream + +Add the necessary logic for supporting the emulated VIRT_SPEC_CTRL MSR to +x86_virt_spec_ctrl(). If either X86_FEATURE_LS_CFG_SSBD or +X86_FEATURE_VIRT_SPEC_CTRL is set then use the new guest_virt_spec_ctrl +argument to check whether the state must be modified on the host. The +update reuses speculative_store_bypass_update() so the ZEN-specific sibling +coordination can be reused. + +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/spec-ctrl.h | 6 ++++++ + arch/x86/kernel/cpu/bugs.c | 30 ++++++++++++++++++++++++++++++ + 2 files changed, 36 insertions(+) + +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -53,6 +53,12 @@ static inline u64 ssbd_tif_to_spec_ctrl( + return (tifn & _TIF_SSBD) >> (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); + } + ++static inline unsigned long ssbd_spec_ctrl_to_tif(u64 spec_ctrl) ++{ ++ BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); ++ return (spec_ctrl & SPEC_CTRL_SSBD) << (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); ++} ++ + static inline u64 ssbd_tif_to_amd_ls_cfg(u64 tifn) + { + return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL; +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -162,6 +162,36 @@ x86_virt_spec_ctrl(u64 guest_spec_ctrl, + wrmsrl(MSR_IA32_SPEC_CTRL, msrval); + } + } ++ ++ /* ++ * If SSBD is not handled in MSR_SPEC_CTRL on AMD, update ++ * MSR_AMD64_L2_CFG or MSR_VIRT_SPEC_CTRL if supported. ++ */ ++ if (!static_cpu_has(X86_FEATURE_LS_CFG_SSBD) && ++ !static_cpu_has(X86_FEATURE_VIRT_SSBD)) ++ return; ++ ++ /* ++ * If the host has SSBD mitigation enabled, force it in the host's ++ * virtual MSR value. If its not permanently enabled, evaluate ++ * current's TIF_SSBD thread flag. ++ */ ++ if (static_cpu_has(X86_FEATURE_SPEC_STORE_BYPASS_DISABLE)) ++ hostval = SPEC_CTRL_SSBD; ++ else ++ hostval = ssbd_tif_to_spec_ctrl(ti->flags); ++ ++ /* Sanitize the guest value */ ++ guestval = guest_virt_spec_ctrl & SPEC_CTRL_SSBD; ++ ++ if (hostval != guestval) { ++ unsigned long tif; ++ ++ tif = setguest ? ssbd_spec_ctrl_to_tif(guestval) : ++ ssbd_spec_ctrl_to_tif(hostval); ++ ++ speculative_store_bypass_update(tif); ++ } + } + EXPORT_SYMBOL_GPL(x86_virt_spec_ctrl); + diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-make-seccomp-the-default-mode-for-speculative-store-bypass.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-make-seccomp-the-default-mode-for-speculative-store-bypass.patch new file mode 100644 index 000000000..3a23bce6c --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-make-seccomp-the-default-mode-for-speculative-store-bypass.patch @@ -0,0 +1,157 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Kees Cook +Date: Thu, 3 May 2018 14:37:54 -0700 +Subject: x86/speculation: Make "seccomp" the default mode for Speculative Store Bypass + +From: Kees Cook + +commit f21b53b20c754021935ea43364dbf53778eeba32 upstream + +Unless explicitly opted out of, anything running under seccomp will have +SSB mitigations enabled. Choosing the "prctl" mode will disable this. + +[ tglx: Adjusted it to the new arch_seccomp_spec_mitigate() mechanism ] + +Signed-off-by: Kees Cook +Signed-off-by: Thomas Gleixner +Signed-off-by: Greg Kroah-Hartman +--- + Documentation/admin-guide/kernel-parameters.txt | 26 ++++++++++++------- + arch/x86/include/asm/nospec-branch.h | 1 + arch/x86/kernel/cpu/bugs.c | 32 +++++++++++++++++------- + 3 files changed, 41 insertions(+), 18 deletions(-) + +--- a/Documentation/admin-guide/kernel-parameters.txt ++++ b/Documentation/admin-guide/kernel-parameters.txt +@@ -4021,19 +4021,27 @@ + This parameter controls whether the Speculative Store + Bypass optimization is used. + +- on - Unconditionally disable Speculative Store Bypass +- off - Unconditionally enable Speculative Store Bypass +- auto - Kernel detects whether the CPU model contains an +- implementation of Speculative Store Bypass and +- picks the most appropriate mitigation. +- prctl - Control Speculative Store Bypass per thread +- via prctl. Speculative Store Bypass is enabled +- for a process by default. The state of the control +- is inherited on fork. ++ on - Unconditionally disable Speculative Store Bypass ++ off - Unconditionally enable Speculative Store Bypass ++ auto - Kernel detects whether the CPU model contains an ++ implementation of Speculative Store Bypass and ++ picks the most appropriate mitigation. If the ++ CPU is not vulnerable, "off" is selected. If the ++ CPU is vulnerable the default mitigation is ++ architecture and Kconfig dependent. See below. ++ prctl - Control Speculative Store Bypass per thread ++ via prctl. Speculative Store Bypass is enabled ++ for a process by default. The state of the control ++ is inherited on fork. ++ seccomp - Same as "prctl" above, but all seccomp threads ++ will disable SSB unless they explicitly opt out. + + Not specifying this option is equivalent to + spec_store_bypass_disable=auto. + ++ Default mitigations: ++ X86: If CONFIG_SECCOMP=y "seccomp", otherwise "prctl" ++ + spia_io_base= [HW,MTD] + spia_fio_base= + spia_pedr= +--- a/arch/x86/include/asm/nospec-branch.h ++++ b/arch/x86/include/asm/nospec-branch.h +@@ -233,6 +233,7 @@ enum ssb_mitigation { + SPEC_STORE_BYPASS_NONE, + SPEC_STORE_BYPASS_DISABLE, + SPEC_STORE_BYPASS_PRCTL, ++ SPEC_STORE_BYPASS_SECCOMP, + }; + + extern char __indirect_thunk_start[]; +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -416,22 +416,25 @@ enum ssb_mitigation_cmd { + SPEC_STORE_BYPASS_CMD_AUTO, + SPEC_STORE_BYPASS_CMD_ON, + SPEC_STORE_BYPASS_CMD_PRCTL, ++ SPEC_STORE_BYPASS_CMD_SECCOMP, + }; + + static const char *ssb_strings[] = { + [SPEC_STORE_BYPASS_NONE] = "Vulnerable", + [SPEC_STORE_BYPASS_DISABLE] = "Mitigation: Speculative Store Bypass disabled", +- [SPEC_STORE_BYPASS_PRCTL] = "Mitigation: Speculative Store Bypass disabled via prctl" ++ [SPEC_STORE_BYPASS_PRCTL] = "Mitigation: Speculative Store Bypass disabled via prctl", ++ [SPEC_STORE_BYPASS_SECCOMP] = "Mitigation: Speculative Store Bypass disabled via prctl and seccomp", + }; + + static const struct { + const char *option; + enum ssb_mitigation_cmd cmd; + } ssb_mitigation_options[] = { +- { "auto", SPEC_STORE_BYPASS_CMD_AUTO }, /* Platform decides */ +- { "on", SPEC_STORE_BYPASS_CMD_ON }, /* Disable Speculative Store Bypass */ +- { "off", SPEC_STORE_BYPASS_CMD_NONE }, /* Don't touch Speculative Store Bypass */ +- { "prctl", SPEC_STORE_BYPASS_CMD_PRCTL }, /* Disable Speculative Store Bypass via prctl */ ++ { "auto", SPEC_STORE_BYPASS_CMD_AUTO }, /* Platform decides */ ++ { "on", SPEC_STORE_BYPASS_CMD_ON }, /* Disable Speculative Store Bypass */ ++ { "off", SPEC_STORE_BYPASS_CMD_NONE }, /* Don't touch Speculative Store Bypass */ ++ { "prctl", SPEC_STORE_BYPASS_CMD_PRCTL }, /* Disable Speculative Store Bypass via prctl */ ++ { "seccomp", SPEC_STORE_BYPASS_CMD_SECCOMP }, /* Disable Speculative Store Bypass via prctl and seccomp */ + }; + + static enum ssb_mitigation_cmd __init ssb_parse_cmdline(void) +@@ -481,8 +484,15 @@ static enum ssb_mitigation_cmd __init __ + + switch (cmd) { + case SPEC_STORE_BYPASS_CMD_AUTO: +- /* Choose prctl as the default mode */ +- mode = SPEC_STORE_BYPASS_PRCTL; ++ case SPEC_STORE_BYPASS_CMD_SECCOMP: ++ /* ++ * Choose prctl+seccomp as the default mode if seccomp is ++ * enabled. ++ */ ++ if (IS_ENABLED(CONFIG_SECCOMP)) ++ mode = SPEC_STORE_BYPASS_SECCOMP; ++ else ++ mode = SPEC_STORE_BYPASS_PRCTL; + break; + case SPEC_STORE_BYPASS_CMD_ON: + mode = SPEC_STORE_BYPASS_DISABLE; +@@ -530,12 +540,14 @@ static void ssb_select_mitigation() + } + + #undef pr_fmt ++#define pr_fmt(fmt) "Speculation prctl: " fmt + + static int ssb_prctl_set(struct task_struct *task, unsigned long ctrl) + { + bool update; + +- if (ssb_mode != SPEC_STORE_BYPASS_PRCTL) ++ if (ssb_mode != SPEC_STORE_BYPASS_PRCTL && ++ ssb_mode != SPEC_STORE_BYPASS_SECCOMP) + return -ENXIO; + + switch (ctrl) { +@@ -583,7 +595,8 @@ int arch_prctl_spec_ctrl_set(struct task + #ifdef CONFIG_SECCOMP + void arch_seccomp_spec_mitigate(struct task_struct *task) + { +- ssb_prctl_set(task, PR_SPEC_FORCE_DISABLE); ++ if (ssb_mode == SPEC_STORE_BYPASS_SECCOMP) ++ ssb_prctl_set(task, PR_SPEC_FORCE_DISABLE); + } + #endif + +@@ -592,6 +605,7 @@ static int ssb_prctl_get(struct task_str + switch (ssb_mode) { + case SPEC_STORE_BYPASS_DISABLE: + return PR_SPEC_DISABLE; ++ case SPEC_STORE_BYPASS_SECCOMP: + case SPEC_STORE_BYPASS_PRCTL: + if (task_spec_ssb_force_disable(task)) + return PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE; diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-rework-speculative_store_bypass_update.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-rework-speculative_store_bypass_update.patch new file mode 100644 index 000000000..ee988603a --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-rework-speculative_store_bypass_update.patch @@ -0,0 +1,66 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Thomas Gleixner +Date: Thu, 10 May 2018 20:31:44 +0200 +Subject: x86/speculation: Rework speculative_store_bypass_update() + +From: Thomas Gleixner + +commit 0270be3e34efb05a88bc4c422572ece038ef3608 upstream + +The upcoming support for the virtual SPEC_CTRL MSR on AMD needs to reuse +speculative_store_bypass_update() to avoid code duplication. Add an +argument for supplying a thread info (TIF) value and create a wrapper +speculative_store_bypass_update_current() which is used at the existing +call site. + +Signed-off-by: Thomas Gleixner +Reviewed-by: Borislav Petkov +Reviewed-by: Konrad Rzeszutek Wilk +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/spec-ctrl.h | 7 ++++++- + arch/x86/kernel/cpu/bugs.c | 2 +- + arch/x86/kernel/process.c | 4 ++-- + 3 files changed, 9 insertions(+), 4 deletions(-) + +--- a/arch/x86/include/asm/spec-ctrl.h ++++ b/arch/x86/include/asm/spec-ctrl.h +@@ -42,6 +42,11 @@ extern void speculative_store_bypass_ht_ + static inline void speculative_store_bypass_ht_init(void) { } + #endif + +-extern void speculative_store_bypass_update(void); ++extern void speculative_store_bypass_update(unsigned long tif); ++ ++static inline void speculative_store_bypass_update_current(void) ++{ ++ speculative_store_bypass_update(current_thread_info()->flags); ++} + + #endif +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -598,7 +598,7 @@ static int ssb_prctl_set(struct task_str + * mitigation until it is next scheduled. + */ + if (task == current && update) +- speculative_store_bypass_update(); ++ speculative_store_bypass_update_current(); + + return 0; + } +--- a/arch/x86/kernel/process.c ++++ b/arch/x86/kernel/process.c +@@ -414,10 +414,10 @@ static __always_inline void __speculativ + intel_set_ssb_state(tifn); + } + +-void speculative_store_bypass_update(void) ++void speculative_store_bypass_update(unsigned long tif) + { + preempt_disable(); +- __speculative_store_bypass_update(current_thread_info()->flags); ++ __speculative_store_bypass_update(tif); + preempt_enable(); + } + diff --git a/debian/patches/bugfix/x86/ssb/x86-speculation-use-synthetic-bits-for-ibrs-ibpb-stibp.patch b/debian/patches/bugfix/x86/ssb/x86-speculation-use-synthetic-bits-for-ibrs-ibpb-stibp.patch new file mode 100644 index 000000000..bf32a5019 --- /dev/null +++ b/debian/patches/bugfix/x86/ssb/x86-speculation-use-synthetic-bits-for-ibrs-ibpb-stibp.patch @@ -0,0 +1,183 @@ +From foo@baz Mon May 21 21:56:07 CEST 2018 +From: Borislav Petkov +Date: Wed, 2 May 2018 18:15:14 +0200 +Subject: x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP + +From: Borislav Petkov + +commit e7c587da125291db39ddf1f49b18e5970adbac17 upstream + +Intel and AMD have different CPUID bits hence for those use synthetic bits +which get set on the respective vendor's in init_speculation_control(). So +that debacles like what the commit message of + + c65732e4f721 ("x86/cpu: Restore CPUID_8000_0008_EBX reload") + +talks about don't happen anymore. + +Signed-off-by: Borislav Petkov +Signed-off-by: Thomas Gleixner +Reviewed-by: Konrad Rzeszutek Wilk +Tested-by: Jörg Otte +Cc: Linus Torvalds +Cc: "Kirill A. Shutemov" +Link: https://lkml.kernel.org/r/20180504161815.GG9257@pd.tnic +Signed-off-by: Greg Kroah-Hartman +--- + arch/x86/include/asm/cpufeatures.h | 10 ++++++---- + arch/x86/kernel/cpu/common.c | 14 ++++++++++---- + arch/x86/kvm/cpuid.c | 10 +++++----- + arch/x86/kvm/svm.c | 6 +++--- + arch/x86/kvm/vmx.c | 9 ++------- + 5 files changed, 26 insertions(+), 23 deletions(-) + +--- a/arch/x86/include/asm/cpufeatures.h ++++ b/arch/x86/include/asm/cpufeatures.h +@@ -198,7 +198,6 @@ + #define X86_FEATURE_CAT_L2 ( 7*32+ 5) /* Cache Allocation Technology L2 */ + #define X86_FEATURE_CDP_L3 ( 7*32+ 6) /* Code and Data Prioritization L3 */ + #define X86_FEATURE_INVPCID_SINGLE ( 7*32+ 7) /* Effectively INVPCID && CR4.PCIDE=1 */ +- + #define X86_FEATURE_HW_PSTATE ( 7*32+ 8) /* AMD HW-PState */ + #define X86_FEATURE_PROC_FEEDBACK ( 7*32+ 9) /* AMD ProcFeedbackInterface */ + #define X86_FEATURE_SME ( 7*32+10) /* AMD Secure Memory Encryption */ +@@ -216,6 +215,9 @@ + #define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */ + #define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */ + #define X86_FEATURE_AMD_SSBD ( 7*32+24) /* "" AMD SSBD implementation */ ++#define X86_FEATURE_IBRS ( 7*32+25) /* Indirect Branch Restricted Speculation */ ++#define X86_FEATURE_IBPB ( 7*32+26) /* Indirect Branch Prediction Barrier */ ++#define X86_FEATURE_STIBP ( 7*32+27) /* Single Thread Indirect Branch Predictors */ + + /* Virtualization flags: Linux defined, word 8 */ + #define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */ +@@ -276,9 +278,9 @@ + #define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */ + #define X86_FEATURE_IRPERF (13*32+ 1) /* Instructions Retired Count */ + #define X86_FEATURE_XSAVEERPTR (13*32+ 2) /* Always save/restore FP error pointers */ +-#define X86_FEATURE_IBPB (13*32+12) /* Indirect Branch Prediction Barrier */ +-#define X86_FEATURE_IBRS (13*32+14) /* Indirect Branch Restricted Speculation */ +-#define X86_FEATURE_STIBP (13*32+15) /* Single Thread Indirect Branch Predictors */ ++#define X86_FEATURE_AMD_IBPB (13*32+12) /* "" Indirect Branch Prediction Barrier */ ++#define X86_FEATURE_AMD_IBRS (13*32+14) /* "" Indirect Branch Restricted Speculation */ ++#define X86_FEATURE_AMD_STIBP (13*32+15) /* "" Single Thread Indirect Branch Predictors */ + + /* Thermal and Power Management Leaf, CPUID level 0x00000006 (EAX), word 14 */ + #define X86_FEATURE_DTHERM (14*32+ 0) /* Digital Thermal Sensor */ +--- a/arch/x86/kernel/cpu/common.c ++++ b/arch/x86/kernel/cpu/common.c +@@ -757,17 +757,23 @@ static void init_speculation_control(str + * and they also have a different bit for STIBP support. Also, + * a hypervisor might have set the individual AMD bits even on + * Intel CPUs, for finer-grained selection of what's available. +- * +- * We use the AMD bits in 0x8000_0008 EBX as the generic hardware +- * features, which are visible in /proc/cpuinfo and used by the +- * kernel. So set those accordingly from the Intel bits. + */ + if (cpu_has(c, X86_FEATURE_SPEC_CTRL)) { + set_cpu_cap(c, X86_FEATURE_IBRS); + set_cpu_cap(c, X86_FEATURE_IBPB); + } ++ + if (cpu_has(c, X86_FEATURE_INTEL_STIBP)) + set_cpu_cap(c, X86_FEATURE_STIBP); ++ ++ if (cpu_has(c, X86_FEATURE_AMD_IBRS)) ++ set_cpu_cap(c, X86_FEATURE_IBRS); ++ ++ if (cpu_has(c, X86_FEATURE_AMD_IBPB)) ++ set_cpu_cap(c, X86_FEATURE_IBPB); ++ ++ if (cpu_has(c, X86_FEATURE_AMD_STIBP)) ++ set_cpu_cap(c, X86_FEATURE_STIBP); + } + + void get_cpu_cap(struct cpuinfo_x86 *c) +--- a/arch/x86/kvm/cpuid.c ++++ b/arch/x86/kvm/cpuid.c +@@ -374,7 +374,7 @@ static inline int __do_cpuid_ent(struct + + /* cpuid 0x80000008.ebx */ + const u32 kvm_cpuid_8000_0008_ebx_x86_features = +- F(IBPB) | F(IBRS); ++ F(AMD_IBPB) | F(AMD_IBRS); + + /* cpuid 0xC0000001.edx */ + const u32 kvm_cpuid_C000_0001_edx_x86_features = +@@ -643,10 +643,10 @@ static inline int __do_cpuid_ent(struct + entry->eax = g_phys_as | (virt_as << 8); + entry->edx = 0; + /* IBRS and IBPB aren't necessarily present in hardware cpuid */ +- if (boot_cpu_has(X86_FEATURE_IBPB)) +- entry->ebx |= F(IBPB); +- if (boot_cpu_has(X86_FEATURE_IBRS)) +- entry->ebx |= F(IBRS); ++ if (boot_cpu_has(X86_FEATURE_AMD_IBPB)) ++ entry->ebx |= F(AMD_IBPB); ++ if (boot_cpu_has(X86_FEATURE_AMD_IBRS)) ++ entry->ebx |= F(AMD_IBRS); + entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features; + cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX); + break; +--- a/arch/x86/kvm/svm.c ++++ b/arch/x86/kvm/svm.c +@@ -3959,7 +3959,7 @@ static int svm_get_msr(struct kvm_vcpu * + break; + case MSR_IA32_SPEC_CTRL: + if (!msr_info->host_initiated && +- !guest_cpuid_has(vcpu, X86_FEATURE_IBRS)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS)) + return 1; + + msr_info->data = svm->spec_ctrl; +@@ -4057,7 +4057,7 @@ static int svm_set_msr(struct kvm_vcpu * + break; + case MSR_IA32_SPEC_CTRL: + if (!msr->host_initiated && +- !guest_cpuid_has(vcpu, X86_FEATURE_IBRS)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS)) + return 1; + + /* The STIBP bit doesn't fault even if it's not advertised */ +@@ -4084,7 +4084,7 @@ static int svm_set_msr(struct kvm_vcpu * + break; + case MSR_IA32_PRED_CMD: + if (!msr->host_initiated && +- !guest_cpuid_has(vcpu, X86_FEATURE_IBPB)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB)) + return 1; + + if (data & ~PRED_CMD_IBPB) +--- a/arch/x86/kvm/vmx.c ++++ b/arch/x86/kvm/vmx.c +@@ -3269,9 +3269,7 @@ static int vmx_get_msr(struct kvm_vcpu * + break; + case MSR_IA32_SPEC_CTRL: + if (!msr_info->host_initiated && +- !guest_cpuid_has(vcpu, X86_FEATURE_IBRS) && +- !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) && +- !guest_cpuid_has(vcpu, X86_FEATURE_SSBD)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) + return 1; + + msr_info->data = to_vmx(vcpu)->spec_ctrl; +@@ -3391,9 +3389,7 @@ static int vmx_set_msr(struct kvm_vcpu * + break; + case MSR_IA32_SPEC_CTRL: + if (!msr_info->host_initiated && +- !guest_cpuid_has(vcpu, X86_FEATURE_IBRS) && +- !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) && +- !guest_cpuid_has(vcpu, X86_FEATURE_SSBD)) ++ !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) + return 1; + + /* The STIBP bit doesn't fault even if it's not advertised */ +@@ -3423,7 +3419,6 @@ static int vmx_set_msr(struct kvm_vcpu * + break; + case MSR_IA32_PRED_CMD: + if (!msr_info->host_initiated && +- !guest_cpuid_has(vcpu, X86_FEATURE_IBPB) && + !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) + return 1; + diff --git a/debian/patches/series b/debian/patches/series index 4c47e7b68..bed62621d 100644 --- a/debian/patches/series +++ b/debian/patches/series @@ -142,6 +142,55 @@ features/all/lockdown/arm64-add-kernel-config-option-to-lock-down-when.patch debian/i386-686-pae-pci-set-pci-nobios-by-default.patch bugfix/all/xfs-enhance-dinode-verifier.patch bugfix/all/xfs-set-format-back-to-extents-if-xfs_bmap_extents_t.patch +bugfix/x86/ssb/x86-nospec-simplify-alternative_msr_write.patch +bugfix/x86/ssb/x86-bugs-concentrate-bug-detection-into-a-separate-function.patch +bugfix/x86/ssb/x86-bugs-concentrate-bug-reporting-into-a-separate-function.patch +bugfix/x86/ssb/x86-bugs-read-spec_ctrl-msr-during-boot-and-re-use-reserved-bits.patch +bugfix/x86/ssb/x86-bugs-kvm-support-the-combination-of-guest-and-host-ibrs.patch +bugfix/x86/ssb/x86-bugs-expose-sys-..-spec_store_bypass.patch +bugfix/x86/ssb/x86-cpufeatures-add-x86_feature_rds.patch +bugfix/x86/ssb/x86-bugs-provide-boot-parameters-for-the-spec_store_bypass_disable-mitigation.patch +bugfix/x86/ssb/x86-bugs-intel-set-proper-cpu-features-and-setup-rds.patch +bugfix/x86/ssb/x86-bugs-whitelist-allowed-spec_ctrl-msr-values.patch +bugfix/x86/ssb/x86-bugs-amd-add-support-to-disable-rds-on-famh-if-requested.patch +bugfix/x86/ssb/x86-kvm-vmx-expose-spec_ctrl-bit-2-to-the-guest.patch +bugfix/x86/ssb/x86-speculation-create-spec-ctrl.h-to-avoid-include-hell.patch +bugfix/x86/ssb/prctl-add-speculation-control-prctls.patch +bugfix/x86/ssb/x86-process-allow-runtime-control-of-speculative-store-bypass.patch +bugfix/x86/ssb/x86-speculation-add-prctl-for-speculative-store-bypass-mitigation.patch +bugfix/x86/ssb/nospec-allow-getting-setting-on-non-current-task.patch +bugfix/x86/ssb/proc-provide-details-on-speculation-flaw-mitigations.patch +bugfix/x86/ssb/seccomp-enable-speculation-flaw-mitigations.patch +bugfix/x86/ssb/x86-bugs-make-boot-modes-__ro_after_init.patch +bugfix/x86/ssb/prctl-add-force-disable-speculation.patch +bugfix/x86/ssb/seccomp-use-pr_spec_force_disable.patch +bugfix/x86/ssb/seccomp-add-filter-flag-to-opt-out-of-ssb-mitigation.patch +bugfix/x86/ssb/seccomp-move-speculation-migitation-control-to-arch-code.patch +bugfix/x86/ssb/x86-speculation-make-seccomp-the-default-mode-for-speculative-store-bypass.patch +bugfix/x86/ssb/x86-bugs-rename-_rds-to-_ssbd.patch +bugfix/x86/ssb/proc-use-underscores-for-ssbd-in-status.patch +bugfix/x86/ssb/documentation-spec_ctrl-do-some-minor-cleanups.patch +bugfix/x86/ssb/x86-bugs-fix-__ssb_select_mitigation-return-type.patch +bugfix/x86/ssb/x86-bugs-make-cpu_show_common-static.patch +bugfix/x86/ssb/x86-bugs-fix-the-parameters-alignment-and-missing-void.patch +bugfix/x86/ssb/x86-cpu-make-alternative_msr_write-work-for-32-bit-code.patch +bugfix/x86/ssb/kvm-svm-move-spec-control-call-after-restore-of-gs.patch +bugfix/x86/ssb/x86-speculation-use-synthetic-bits-for-ibrs-ibpb-stibp.patch +bugfix/x86/ssb/x86-cpufeatures-disentangle-msr_spec_ctrl-enumeration-from-ibrs.patch +bugfix/x86/ssb/x86-cpufeatures-disentangle-ssbd-enumeration.patch +bugfix/x86/ssb/x86-cpufeatures-add-feature_zen.patch +bugfix/x86/ssb/x86-speculation-handle-ht-correctly-on-amd.patch +bugfix/x86/ssb/x86-bugs-kvm-extend-speculation-control-for-virt_spec_ctrl.patch +bugfix/x86/ssb/x86-speculation-add-virtualized-speculative-store-bypass-disable-support.patch +bugfix/x86/ssb/x86-speculation-rework-speculative_store_bypass_update.patch +bugfix/x86/ssb/x86-bugs-unify-x86_spec_ctrl_-set_guest-restore_host.patch +bugfix/x86/ssb/x86-bugs-expose-x86_spec_ctrl_base-directly.patch +bugfix/x86/ssb/x86-bugs-remove-x86_spec_ctrl_set.patch +bugfix/x86/ssb/x86-bugs-rework-spec_ctrl-base-and-mask-logic.patch +bugfix/x86/ssb/x86-speculation-kvm-implement-support-for-virt_spec_ctrl-ls_cfg.patch +bugfix/x86/ssb/kvm-svm-implement-virt_spec_ctrl-support-for-ssbd.patch +bugfix/x86/ssb/x86-bugs-rename-ssbd_no-to-ssb_no.patch +bugfix/x86/ssb/bpf-prevent-memory-disambiguation-attack.patch # Fix exported symbol versions bugfix/all/module-disable-matching-missing-version-crc.patch