Update to 4.1.6
Drop patches applied upstream. Ignore an ABI change in ppc crypto drivers.
This commit is contained in:
parent
21cc1b71d1
commit
cbf8872266
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@ -1,4 +1,87 @@
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linux (4.1.5-2) UNRELEASED; urgency=medium
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linux (4.1.6-1) UNRELEASED; urgency=medium
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* New upstream stable update:
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https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.6
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- [mips*] unaligned: Fix build error on big endian R6 kernels
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- [mips*] Replace add and sub instructions in relocate_kernel.S with addiu
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- [mips*/*-malta] Don't reinitialise RTC
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- [mips*] Fix sched_getaffinity with MT FPAFF enabled
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- [mips*] Export get_c0_perfcount_int()
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- [mips*] do_mcheck: Fix kernel code dump with EVA
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- [mips*] show_stack: Fix stack trace with EVA
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- [mips*] Revert "MIPS: BCM63xx: Provide a plat_post_dma_flush hook"
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- [mips*] Flush RPS on kernel entry with EVA
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- [mips*] Make set_pte() SMP safe.
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- fsnotify: fix oops in fsnotify_clear_marks_by_group_flags()
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- [x86] drm/i915: Declare the swizzling unknown for L-shaped configurations
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- [x86] drm/i915: Replace WARN inside I915_READ64_2x32 with retry loop
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- drm/radeon: rework audio detect (v4)
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- drm/radeon/combios: add some validation of lvds values
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- drm/dp-mst: Remove debug WARN_ON
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- ipr: Fix locking for unit attention handling
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- ipr: Fix incorrect trace indexing
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- ipr: Fix invalid array indexing for HRRQ
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- Bluetooth: Fix NULL pointer dereference in smp_conn_security
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- dmaengine: pl330: Fix overflow when reporting residue in memcpy
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- dmaengine: pl330: Really fix choppy sound because of wrong residue
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calculation
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- xhci: fix off by one error in TRB DMA address boundary check
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- drivers/usb: Delete XHCI command timer if necessary
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- USB: sierra: add 1199:68AB device ID
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- usb: udc: core: add device_del() call to error pathway
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- usb: chipidea: ehci_init_driver is intended to call one time
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- phy: twl4030-usb: make runtime pm more reliable.
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- ath10k: fix qca61x4 hw2.1 support
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- dmaengine: at_xdmac: fix transfer data width in at_xdmac_prep_slave_sg()
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- [ppc64*] crypto: nx - Fixing NX data alignment with nx_sg list
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- [ppc64*] crypto: nx - Fixing SHA update bug
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- [ppc64*] crypto: nx - Fix reentrancy bugs
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- [sparc*] Fix userspace FPU register corruptions.
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- clk: keystone: add support for post divider register for main pll
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- [armel,armhf] dts: keystone: fix dt bindings to use post div register for
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mainpll
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- [x86] ASoC: Intel: Get correct usage_count value to load firmware
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- ASoC: ssm4567: Keep TDM_BCLKS in ssm4567_set_dai_fmt
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- ASoC: pcm1681: Fix setting de-emphasis sampling rate selection
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- ASoC: dapm: Lock during userspace access
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- ASoC: dapm: Don't add prefix to widget stream name
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- [x86] xen: Probe target addresses in set_aliased_prot() before the
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hypercall
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- xen/gntdevt: Fix race condition in gntdev_release()
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- hwrng: core - correct error check of kthread_run call
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- crypto: qat - Fix invalid synchronization between register/unregister sym
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algs
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- [armel] crypto: ixp4xx - Remove bogus BUG_ON on scattered dst buffer
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- rbd: fix copyup completion race
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- [armhf] OMAP2+: hwmod: Fix _wait_target_ready() for hwmods without sysc
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- ALSA: hda - fix cs4210_spdif_automute()
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- ALSA: hda - one Dell machine needs the headphone white noise fixup
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- ALSA: fireworks/firewire-lib: add support for recent firmware quirk
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- hwmon: (nct7904) Export I2C module alias information
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- [x86] hwmon: (dell-smm) Blacklist Dell Studio XPS 8100
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- ipc: modify message queue accounting to not take kernel data structures
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into account
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- ocfs2: fix BUG in ocfs2_downconvert_thread_do_work()
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- ocfs2: fix shift left overflow
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- nfsd: Drop BUG_ON and ignore SECLABEL on absent filesystem
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- md/raid1: extend spinlock to protect raid1_end_read_request against
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inconsistencies
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- dm: fix dm_merge_bvec regression on 32 bit systems
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- staging: vt6655: vnt_bss_info_changed check conf->beacon_rate is not NULL
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- staging: lustre: Include unaligned.h instead of access_ok.h
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- usb: gadget: f_uac2: fix calculation of uac2->p_interval
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- USB: qcserial/option: make AT URCs work for Sierra Wireless MC7305/MC7355
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- USB: qcserial: Add support for Dell Wireless 5809e 4G Modem
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- mtd: nand: Fix NAND_USE_BOUNCE_BUFFER flag conflict
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- Input: alps - only Dell laptops have separate button bits for v2
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dualpoint sticks
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- [armhf] thermal: exynos: Disable the regulator on probe failure
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- mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations
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- signalfd: fix information leak in signalfd_copyinfo
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- signal: fix information leak in copy_siginfo_to_user
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- signal: fix information leak in copy_siginfo_from_user32
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- nfsd: refactor nfs4_preprocess_stateid_op
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- nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid
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[ Aurelien Jarno ]
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* [mips*] Build ext4 as module. Add core-modules and ext4-modules udeb.
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@ -1,5 +1,7 @@
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[abi]
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abiname: 2
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ignore-changes:
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module:drivers/crypto/nx/
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[base]
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arches:
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@ -1,69 +0,0 @@
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From: Benjamin Randazzo <benjamin@randazzo.fr>
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Date: Sat, 25 Jul 2015 16:36:50 +0200
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Subject: md: use kzalloc() when bitmap is disabled
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Origin: http://git.neil.brown.name/?p=md.git;a=commit;h=77ba0569d4c8389c0a2162ab0c7c16a6f3b199e4
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In drivers/md/md.c get_bitmap_file() uses kmalloc() for creating a
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mdu_bitmap_file_t called "file".
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5769 file = kmalloc(sizeof(*file), GFP_NOIO);
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5770 if (!file)
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5771 return -ENOMEM;
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This structure is copied to user space at the end of the function.
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5786 if (err == 0 &&
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5787 copy_to_user(arg, file, sizeof(*file)))
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5788 err = -EFAULT
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But if bitmap is disabled only the first byte of "file" is initialized
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with zero, so it's possible to read some bytes (up to 4095) of kernel
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space memory from user space. This is an information leak.
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5775 /* bitmap disabled, zero the first byte and copy out */
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5776 if (!mddev->bitmap_info.file)
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5777 file->pathname[0] = '\0';
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Signed-off-by: Benjamin Randazzo <benjamin@randazzo.fr>
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Signed-off-by: NeilBrown <neilb@suse.com>
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[bwh: Backported to 4.1: using d_path() instead of file_path()]
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---
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drivers/md/md.c | 22 +++++++++++-----------
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1 file changed, 11 insertions(+), 11 deletions(-)
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--- a/drivers/md/md.c
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+++ b/drivers/md/md.c
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@@ -5735,22 +5735,22 @@ static int get_bitmap_file(struct mddev
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char *ptr;
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int err;
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- file = kmalloc(sizeof(*file), GFP_NOIO);
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+ file = kzalloc(sizeof(*file), GFP_NOIO);
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if (!file)
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return -ENOMEM;
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err = 0;
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spin_lock(&mddev->lock);
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- /* bitmap disabled, zero the first byte and copy out */
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- if (!mddev->bitmap_info.file)
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- file->pathname[0] = '\0';
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- else if ((ptr = d_path(&mddev->bitmap_info.file->f_path,
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- file->pathname, sizeof(file->pathname))),
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- IS_ERR(ptr))
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- err = PTR_ERR(ptr);
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- else
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- memmove(file->pathname, ptr,
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- sizeof(file->pathname)-(ptr-file->pathname));
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+ /* bitmap enabled */
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+ if (mddev->bitmap_info.file) {
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+ ptr = d_path(&mddev->bitmap_info.file->f_path, file->pathname,
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+ sizeof(file->pathname));
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+ if (IS_ERR(ptr))
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+ err = PTR_ERR(ptr);
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+ else
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+ memmove(file->pathname, ptr,
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+ sizeof(file->pathname)-(ptr-file->pathname));
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+ }
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spin_unlock(&mddev->lock);
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if (err == 0 &&
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@ -1,47 +0,0 @@
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From: Andy Lutomirski <luto@kernel.org>
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Date: Thu, 4 Jun 2015 13:24:29 -0700
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Subject: [3/9] x86/asm/entry/64: Remove pointless jump to irq_return
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Origin: https://git.kernel.org/linus/5ca6f70f387b4f82903037cc3c5488e2c97dcdbc
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INTERRUPT_RETURN turns into a jmp instruction. There's no need
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for extra indirection.
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Cc: <linux-kernel@vger.kernel.org>
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Cc: Andrew Morton <akpm@linux-foundation.org>
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Cc: Andy Lutomirski <luto@amacapital.net>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Denys Vlasenko <dvlasenk@redhat.com>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/r/2f2318653dbad284a59311f13f08cea71298fd7c.1433449436.git.luto@kernel.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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[bwh: Backported to 4.1: adjust filename, context]
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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arch/x86/kernel/entry_64.S | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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--- a/arch/x86/kernel/entry_64.S
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+++ b/arch/x86/kernel/entry_64.S
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@@ -811,8 +811,6 @@ retint_kernel:
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restore_c_regs_and_iret:
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RESTORE_C_REGS
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REMOVE_PT_GPREGS_FROM_STACK 8
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-
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-irq_return:
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INTERRUPT_RETURN
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ENTRY(native_iret)
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@@ -1658,7 +1656,7 @@ nmi_restore:
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/* Clear the NMI executing stack variable */
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movq $0, 5*8(%rsp)
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- jmp irq_return
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+ INTERRUPT_RETURN
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CFI_ENDPROC
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END(nmi)
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@ -1,191 +0,0 @@
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From: Andy Lutomirski <luto@kernel.org>
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Date: Wed, 15 Jul 2015 10:29:33 -0700
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Subject: [4/9] x86/nmi: Enable nested do_nmi() handling for 64-bit kernels
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Origin: https://git.kernel.org/linus/9d05041679904b12c12421cbcf9cb5f4860a8d7b
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32-bit kernels handle nested NMIs in C. Enable the exact same
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handling on 64-bit kernels as well. This isn't currently
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necessary, but it will become necessary once the asm code starts
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allowing limited nesting.
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
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Cc: Borislav Petkov <bp@suse.de>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: stable@vger.kernel.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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---
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arch/x86/kernel/nmi.c | 123 +++++++++++++++++++++-----------------------------
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1 file changed, 52 insertions(+), 71 deletions(-)
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--- a/arch/x86/kernel/nmi.c
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+++ b/arch/x86/kernel/nmi.c
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@@ -408,15 +408,15 @@ static void default_do_nmi(struct pt_reg
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NOKPROBE_SYMBOL(default_do_nmi);
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/*
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- * NMIs can hit breakpoints which will cause it to lose its
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- * NMI context with the CPU when the breakpoint does an iret.
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- */
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-#ifdef CONFIG_X86_32
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-/*
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- * For i386, NMIs use the same stack as the kernel, and we can
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- * add a workaround to the iret problem in C (preventing nested
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- * NMIs if an NMI takes a trap). Simply have 3 states the NMI
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- * can be in:
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+ * NMIs can hit breakpoints which will cause it to lose its NMI context
|
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+ * with the CPU when the breakpoint or page fault does an IRET.
|
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+ *
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+ * As a result, NMIs can nest if NMIs get unmasked due an IRET during
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+ * NMI processing. On x86_64, the asm glue protects us from nested NMIs
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+ * if the outer NMI came from kernel mode, but we can still nest if the
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+ * outer NMI came from user mode.
|
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+ *
|
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+ * To handle these nested NMIs, we have three states:
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*
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* 1) not running
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* 2) executing
|
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@@ -430,15 +430,14 @@ NOKPROBE_SYMBOL(default_do_nmi);
|
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* (Note, the latch is binary, thus multiple NMIs triggering,
|
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* when one is running, are ignored. Only one NMI is restarted.)
|
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*
|
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- * If an NMI hits a breakpoint that executes an iret, another
|
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- * NMI can preempt it. We do not want to allow this new NMI
|
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- * to run, but we want to execute it when the first one finishes.
|
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- * We set the state to "latched", and the exit of the first NMI will
|
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- * perform a dec_return, if the result is zero (NOT_RUNNING), then
|
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- * it will simply exit the NMI handler. If not, the dec_return
|
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- * would have set the state to NMI_EXECUTING (what we want it to
|
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- * be when we are running). In this case, we simply jump back
|
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- * to rerun the NMI handler again, and restart the 'latched' NMI.
|
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+ * If an NMI executes an iret, another NMI can preempt it. We do not
|
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+ * want to allow this new NMI to run, but we want to execute it when the
|
||||
+ * first one finishes. We set the state to "latched", and the exit of
|
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+ * the first NMI will perform a dec_return, if the result is zero
|
||||
+ * (NOT_RUNNING), then it will simply exit the NMI handler. If not, the
|
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+ * dec_return would have set the state to NMI_EXECUTING (what we want it
|
||||
+ * to be when we are running). In this case, we simply jump back to
|
||||
+ * rerun the NMI handler again, and restart the 'latched' NMI.
|
||||
*
|
||||
* No trap (breakpoint or page fault) should be hit before nmi_restart,
|
||||
* thus there is no race between the first check of state for NOT_RUNNING
|
||||
@@ -461,49 +460,36 @@ enum nmi_states {
|
||||
static DEFINE_PER_CPU(enum nmi_states, nmi_state);
|
||||
static DEFINE_PER_CPU(unsigned long, nmi_cr2);
|
||||
|
||||
-#define nmi_nesting_preprocess(regs) \
|
||||
- do { \
|
||||
- if (this_cpu_read(nmi_state) != NMI_NOT_RUNNING) { \
|
||||
- this_cpu_write(nmi_state, NMI_LATCHED); \
|
||||
- return; \
|
||||
- } \
|
||||
- this_cpu_write(nmi_state, NMI_EXECUTING); \
|
||||
- this_cpu_write(nmi_cr2, read_cr2()); \
|
||||
- } while (0); \
|
||||
- nmi_restart:
|
||||
-
|
||||
-#define nmi_nesting_postprocess() \
|
||||
- do { \
|
||||
- if (unlikely(this_cpu_read(nmi_cr2) != read_cr2())) \
|
||||
- write_cr2(this_cpu_read(nmi_cr2)); \
|
||||
- if (this_cpu_dec_return(nmi_state)) \
|
||||
- goto nmi_restart; \
|
||||
- } while (0)
|
||||
-#else /* x86_64 */
|
||||
+#ifdef CONFIG_X86_64
|
||||
/*
|
||||
- * In x86_64 things are a bit more difficult. This has the same problem
|
||||
- * where an NMI hitting a breakpoint that calls iret will remove the
|
||||
- * NMI context, allowing a nested NMI to enter. What makes this more
|
||||
- * difficult is that both NMIs and breakpoints have their own stack.
|
||||
- * When a new NMI or breakpoint is executed, the stack is set to a fixed
|
||||
- * point. If an NMI is nested, it will have its stack set at that same
|
||||
- * fixed address that the first NMI had, and will start corrupting the
|
||||
- * stack. This is handled in entry_64.S, but the same problem exists with
|
||||
- * the breakpoint stack.
|
||||
- *
|
||||
- * If a breakpoint is being processed, and the debug stack is being used,
|
||||
- * if an NMI comes in and also hits a breakpoint, the stack pointer
|
||||
- * will be set to the same fixed address as the breakpoint that was
|
||||
- * interrupted, causing that stack to be corrupted. To handle this case,
|
||||
- * check if the stack that was interrupted is the debug stack, and if
|
||||
- * so, change the IDT so that new breakpoints will use the current stack
|
||||
- * and not switch to the fixed address. On return of the NMI, switch back
|
||||
- * to the original IDT.
|
||||
+ * In x86_64, we need to handle breakpoint -> NMI -> breakpoint. Without
|
||||
+ * some care, the inner breakpoint will clobber the outer breakpoint's
|
||||
+ * stack.
|
||||
+ *
|
||||
+ * If a breakpoint is being processed, and the debug stack is being
|
||||
+ * used, if an NMI comes in and also hits a breakpoint, the stack
|
||||
+ * pointer will be set to the same fixed address as the breakpoint that
|
||||
+ * was interrupted, causing that stack to be corrupted. To handle this
|
||||
+ * case, check if the stack that was interrupted is the debug stack, and
|
||||
+ * if so, change the IDT so that new breakpoints will use the current
|
||||
+ * stack and not switch to the fixed address. On return of the NMI,
|
||||
+ * switch back to the original IDT.
|
||||
*/
|
||||
static DEFINE_PER_CPU(int, update_debug_stack);
|
||||
+#endif
|
||||
|
||||
-static inline void nmi_nesting_preprocess(struct pt_regs *regs)
|
||||
+dotraplinkage notrace void
|
||||
+do_nmi(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
+ if (this_cpu_read(nmi_state) != NMI_NOT_RUNNING) {
|
||||
+ this_cpu_write(nmi_state, NMI_LATCHED);
|
||||
+ return;
|
||||
+ }
|
||||
+ this_cpu_write(nmi_state, NMI_EXECUTING);
|
||||
+ this_cpu_write(nmi_cr2, read_cr2());
|
||||
+nmi_restart:
|
||||
+
|
||||
+#ifdef CONFIG_X86_64
|
||||
/*
|
||||
* If we interrupted a breakpoint, it is possible that
|
||||
* the nmi handler will have breakpoints too. We need to
|
||||
@@ -514,22 +500,8 @@ static inline void nmi_nesting_preproces
|
||||
debug_stack_set_zero();
|
||||
this_cpu_write(update_debug_stack, 1);
|
||||
}
|
||||
-}
|
||||
-
|
||||
-static inline void nmi_nesting_postprocess(void)
|
||||
-{
|
||||
- if (unlikely(this_cpu_read(update_debug_stack))) {
|
||||
- debug_stack_reset();
|
||||
- this_cpu_write(update_debug_stack, 0);
|
||||
- }
|
||||
-}
|
||||
#endif
|
||||
|
||||
-dotraplinkage notrace void
|
||||
-do_nmi(struct pt_regs *regs, long error_code)
|
||||
-{
|
||||
- nmi_nesting_preprocess(regs);
|
||||
-
|
||||
nmi_enter();
|
||||
|
||||
inc_irq_stat(__nmi_count);
|
||||
@@ -539,8 +511,17 @@ do_nmi(struct pt_regs *regs, long error_
|
||||
|
||||
nmi_exit();
|
||||
|
||||
- /* On i386, may loop back to preprocess */
|
||||
- nmi_nesting_postprocess();
|
||||
+#ifdef CONFIG_X86_64
|
||||
+ if (unlikely(this_cpu_read(update_debug_stack))) {
|
||||
+ debug_stack_reset();
|
||||
+ this_cpu_write(update_debug_stack, 0);
|
||||
+ }
|
||||
+#endif
|
||||
+
|
||||
+ if (unlikely(this_cpu_read(nmi_cr2) != read_cr2()))
|
||||
+ write_cr2(this_cpu_read(nmi_cr2));
|
||||
+ if (this_cpu_dec_return(nmi_state))
|
||||
+ goto nmi_restart;
|
||||
}
|
||||
NOKPROBE_SYMBOL(do_nmi);
|
||||
|
|
@ -1,53 +0,0 @@
|
|||
From: Andy Lutomirski <luto@kernel.org>
|
||||
Date: Wed, 15 Jul 2015 10:29:34 -0700
|
||||
Subject: [5/9] x86/nmi/64: Remove asm code that saves CR2
|
||||
Origin: https://git.kernel.org/linus/0e181bb58143cb4a2e8f01c281b0816cd0e4798e
|
||||
|
||||
Now that do_nmi saves CR2, we don't need to save it in asm.
|
||||
|
||||
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
||||
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
|
||||
Acked-by: Borislav Petkov <bp@suse.de>
|
||||
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
||||
Cc: Peter Zijlstra <peterz@infradead.org>
|
||||
Cc: Thomas Gleixner <tglx@linutronix.de>
|
||||
Cc: stable@vger.kernel.org
|
||||
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
||||
[bwh: Backported to 4.0: adjust filename, context]
|
||||
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
|
||||
---
|
||||
arch/x86/kernel/entry_64.S | 18 ------------------
|
||||
1 file changed, 18 deletions(-)
|
||||
|
||||
--- a/arch/x86/kernel/entry_64.S
|
||||
+++ b/arch/x86/kernel/entry_64.S
|
||||
@@ -1621,29 +1621,11 @@ end_repeat_nmi:
|
||||
call paranoid_entry
|
||||
DEFAULT_FRAME 0
|
||||
|
||||
- /*
|
||||
- * Save off the CR2 register. If we take a page fault in the NMI then
|
||||
- * it could corrupt the CR2 value. If the NMI preempts a page fault
|
||||
- * handler before it was able to read the CR2 register, and then the
|
||||
- * NMI itself takes a page fault, the page fault that was preempted
|
||||
- * will read the information from the NMI page fault and not the
|
||||
- * origin fault. Save it off and restore it if it changes.
|
||||
- * Use the r12 callee-saved register.
|
||||
- */
|
||||
- movq %cr2, %r12
|
||||
-
|
||||
/* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */
|
||||
movq %rsp,%rdi
|
||||
movq $-1,%rsi
|
||||
call do_nmi
|
||||
|
||||
- /* Did the NMI take a page fault? Restore cr2 if it did */
|
||||
- movq %cr2, %rcx
|
||||
- cmpq %rcx, %r12
|
||||
- je 1f
|
||||
- movq %r12, %cr2
|
||||
-1:
|
||||
-
|
||||
testl %ebx,%ebx /* swapgs needed? */
|
||||
jnz nmi_restore
|
||||
nmi_swapgs:
|
|
@ -1,112 +0,0 @@
|
|||
From: Andy Lutomirski <luto@kernel.org>
|
||||
Date: Wed, 15 Jul 2015 10:29:35 -0700
|
||||
Subject: [6/9] x86/nmi/64: Switch stacks on userspace NMI entry
|
||||
Origin: https://git.kernel.org/linus/9b6e6a8334d56354853f9c255d1395c2ba570e0a
|
||||
|
||||
Returning to userspace is tricky: IRET can fail, and ESPFIX can
|
||||
rearrange the stack prior to IRET.
|
||||
|
||||
The NMI nesting fixup relies on a precise stack layout and
|
||||
atomic IRET. Rather than trying to teach the NMI nesting fixup
|
||||
to handle ESPFIX and failed IRET, punt: run NMIs that came from
|
||||
user mode on the normal kernel stack.
|
||||
|
||||
This will make some nested NMIs visible to C code, but the C
|
||||
code is okay with that.
|
||||
|
||||
As a side effect, this should speed up perf: it eliminates an
|
||||
RDMSR when NMIs come from user mode.
|
||||
|
||||
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
||||
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
|
||||
Reviewed-by: Borislav Petkov <bp@suse.de>
|
||||
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
||||
Cc: Peter Zijlstra <peterz@infradead.org>
|
||||
Cc: Thomas Gleixner <tglx@linutronix.de>
|
||||
Cc: stable@vger.kernel.org
|
||||
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
||||
[bwh: Backported to 4.1:
|
||||
- Adjust filename, context
|
||||
- Use kernel_stack instead of cpu_current_top_of_stack]
|
||||
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
|
||||
---
|
||||
--- a/arch/x86/kernel/entry_64.S
|
||||
+++ b/arch/x86/kernel/entry_64.S
|
||||
@@ -1442,19 +1442,73 @@ ENTRY(nmi)
|
||||
* a nested NMI that updated the copy interrupt stack frame, a
|
||||
* jump will be made to the repeat_nmi code that will handle the second
|
||||
* NMI.
|
||||
+ *
|
||||
+ * However, espfix prevents us from directly returning to userspace
|
||||
+ * with a single IRET instruction. Similarly, IRET to user mode
|
||||
+ * can fault. We therefore handle NMIs from user space like
|
||||
+ * other IST entries.
|
||||
*/
|
||||
|
||||
/* Use %rdx as our temp variable throughout */
|
||||
pushq_cfi %rdx
|
||||
CFI_REL_OFFSET rdx, 0
|
||||
|
||||
+ testb $3, CS-RIP+8(%rsp)
|
||||
+ jz .Lnmi_from_kernel
|
||||
+
|
||||
+ /*
|
||||
+ * NMI from user mode. We need to run on the thread stack, but we
|
||||
+ * can't go through the normal entry paths: NMIs are masked, and
|
||||
+ * we don't want to enable interrupts, because then we'll end
|
||||
+ * up in an awkward situation in which IRQs are on but NMIs
|
||||
+ * are off.
|
||||
+ */
|
||||
+
|
||||
+ SWAPGS
|
||||
+ cld
|
||||
+ movq %rsp, %rdx
|
||||
+ movq PER_CPU_VAR(kernel_stack), %rsp
|
||||
+ pushq 5*8(%rdx) /* pt_regs->ss */
|
||||
+ pushq 4*8(%rdx) /* pt_regs->rsp */
|
||||
+ pushq 3*8(%rdx) /* pt_regs->flags */
|
||||
+ pushq 2*8(%rdx) /* pt_regs->cs */
|
||||
+ pushq 1*8(%rdx) /* pt_regs->rip */
|
||||
+ pushq $-1 /* pt_regs->orig_ax */
|
||||
+ pushq %rdi /* pt_regs->di */
|
||||
+ pushq %rsi /* pt_regs->si */
|
||||
+ pushq (%rdx) /* pt_regs->dx */
|
||||
+ pushq %rcx /* pt_regs->cx */
|
||||
+ pushq %rax /* pt_regs->ax */
|
||||
+ pushq %r8 /* pt_regs->r8 */
|
||||
+ pushq %r9 /* pt_regs->r9 */
|
||||
+ pushq %r10 /* pt_regs->r10 */
|
||||
+ pushq %r11 /* pt_regs->r11 */
|
||||
+ pushq %rbx /* pt_regs->rbx */
|
||||
+ pushq %rbp /* pt_regs->rbp */
|
||||
+ pushq %r12 /* pt_regs->r12 */
|
||||
+ pushq %r13 /* pt_regs->r13 */
|
||||
+ pushq %r14 /* pt_regs->r14 */
|
||||
+ pushq %r15 /* pt_regs->r15 */
|
||||
+
|
||||
+ /*
|
||||
+ * At this point we no longer need to worry about stack damage
|
||||
+ * due to nesting -- we're on the normal thread stack and we're
|
||||
+ * done with the NMI stack.
|
||||
+ */
|
||||
+
|
||||
+ movq %rsp, %rdi
|
||||
+ movq $-1, %rsi
|
||||
+ call do_nmi
|
||||
+
|
||||
/*
|
||||
- * If %cs was not the kernel segment, then the NMI triggered in user
|
||||
- * space, which means it is definitely not nested.
|
||||
+ * Return back to user mode. We must *not* do the normal exit
|
||||
+ * work, because we don't want to enable interrupts. Fortunately,
|
||||
+ * do_nmi doesn't modify pt_regs.
|
||||
*/
|
||||
- cmpl $__KERNEL_CS, 16(%rsp)
|
||||
- jne first_nmi
|
||||
+ SWAPGS
|
||||
+ jmp restore_c_regs_and_iret
|
||||
|
||||
+.Lnmi_from_kernel:
|
||||
/*
|
||||
* Check the special variable on the stack to see if NMIs are
|
||||
* executing.
|
|
@ -1,286 +0,0 @@
|
|||
From: Andy Lutomirski <luto@kernel.org>
|
||||
Date: Wed, 15 Jul 2015 10:29:36 -0700
|
||||
Subject: [7/9] x86/nmi/64: Improve nested NMI comments
|
||||
Origin: https://git.kernel.org/linus/0b22930ebad563ae97ff3f8d7b9f12060b4c6e6b
|
||||
|
||||
I found the nested NMI documentation to be difficult to follow.
|
||||
Improve the comments.
|
||||
|
||||
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
||||
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
|
||||
Cc: Borislav Petkov <bp@suse.de>
|
||||
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
||||
Cc: Peter Zijlstra <peterz@infradead.org>
|
||||
Cc: Thomas Gleixner <tglx@linutronix.de>
|
||||
Cc: stable@vger.kernel.org
|
||||
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
||||
[bwh: Backported to 4.1: adjust filename, context]
|
||||
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
|
||||
---
|
||||
arch/x86/kernel/entry_64.S | 159 ++++++++++++++++++++++++++-------------------
|
||||
arch/x86/kernel/nmi.c | 4 +-
|
||||
2 files changed, 93 insertions(+), 70 deletions(-)
|
||||
|
||||
--- a/arch/x86/kernel/entry_64.S
|
||||
+++ b/arch/x86/kernel/entry_64.S
|
||||
@@ -1429,11 +1429,12 @@ ENTRY(nmi)
|
||||
* If the variable is not set and the stack is not the NMI
|
||||
* stack then:
|
||||
* o Set the special variable on the stack
|
||||
- * o Copy the interrupt frame into a "saved" location on the stack
|
||||
- * o Copy the interrupt frame into a "copy" location on the stack
|
||||
+ * o Copy the interrupt frame into an "outermost" location on the
|
||||
+ * stack
|
||||
+ * o Copy the interrupt frame into an "iret" location on the stack
|
||||
* o Continue processing the NMI
|
||||
* If the variable is set or the previous stack is the NMI stack:
|
||||
- * o Modify the "copy" location to jump to the repeate_nmi
|
||||
+ * o Modify the "iret" location to jump to the repeat_nmi
|
||||
* o return back to the first NMI
|
||||
*
|
||||
* Now on exit of the first NMI, we first clear the stack variable
|
||||
@@ -1510,18 +1511,60 @@ ENTRY(nmi)
|
||||
|
||||
.Lnmi_from_kernel:
|
||||
/*
|
||||
- * Check the special variable on the stack to see if NMIs are
|
||||
- * executing.
|
||||
+ * Here's what our stack frame will look like:
|
||||
+ * +---------------------------------------------------------+
|
||||
+ * | original SS |
|
||||
+ * | original Return RSP |
|
||||
+ * | original RFLAGS |
|
||||
+ * | original CS |
|
||||
+ * | original RIP |
|
||||
+ * +---------------------------------------------------------+
|
||||
+ * | temp storage for rdx |
|
||||
+ * +---------------------------------------------------------+
|
||||
+ * | "NMI executing" variable |
|
||||
+ * +---------------------------------------------------------+
|
||||
+ * | iret SS } Copied from "outermost" frame |
|
||||
+ * | iret Return RSP } on each loop iteration; overwritten |
|
||||
+ * | iret RFLAGS } by a nested NMI to force another |
|
||||
+ * | iret CS } iteration if needed. |
|
||||
+ * | iret RIP } |
|
||||
+ * +---------------------------------------------------------+
|
||||
+ * | outermost SS } initialized in first_nmi; |
|
||||
+ * | outermost Return RSP } will not be changed before |
|
||||
+ * | outermost RFLAGS } NMI processing is done. |
|
||||
+ * | outermost CS } Copied to "iret" frame on each |
|
||||
+ * | outermost RIP } iteration. |
|
||||
+ * +---------------------------------------------------------+
|
||||
+ * | pt_regs |
|
||||
+ * +---------------------------------------------------------+
|
||||
+ *
|
||||
+ * The "original" frame is used by hardware. Before re-enabling
|
||||
+ * NMIs, we need to be done with it, and we need to leave enough
|
||||
+ * space for the asm code here.
|
||||
+ *
|
||||
+ * We return by executing IRET while RSP points to the "iret" frame.
|
||||
+ * That will either return for real or it will loop back into NMI
|
||||
+ * processing.
|
||||
+ *
|
||||
+ * The "outermost" frame is copied to the "iret" frame on each
|
||||
+ * iteration of the loop, so each iteration starts with the "iret"
|
||||
+ * frame pointing to the final return target.
|
||||
+ */
|
||||
+
|
||||
+ /*
|
||||
+ * Determine whether we're a nested NMI.
|
||||
+ *
|
||||
+ * First check "NMI executing". If it's set, then we're nested.
|
||||
+ * This will not detect if we interrupted an outer NMI just
|
||||
+ * before IRET.
|
||||
*/
|
||||
cmpl $1, -8(%rsp)
|
||||
je nested_nmi
|
||||
|
||||
/*
|
||||
- * Now test if the previous stack was an NMI stack.
|
||||
- * We need the double check. We check the NMI stack to satisfy the
|
||||
- * race when the first NMI clears the variable before returning.
|
||||
- * We check the variable because the first NMI could be in a
|
||||
- * breakpoint routine using a breakpoint stack.
|
||||
+ * Now test if the previous stack was an NMI stack. This covers
|
||||
+ * the case where we interrupt an outer NMI after it clears
|
||||
+ * "NMI executing" but before IRET.
|
||||
*/
|
||||
lea 6*8(%rsp), %rdx
|
||||
/* Compare the NMI stack (rdx) with the stack we came from (4*8(%rsp)) */
|
||||
@@ -1538,9 +1581,11 @@ ENTRY(nmi)
|
||||
|
||||
nested_nmi:
|
||||
/*
|
||||
- * Do nothing if we interrupted the fixup in repeat_nmi.
|
||||
- * It's about to repeat the NMI handler, so we are fine
|
||||
- * with ignoring this one.
|
||||
+ * If we interrupted an NMI that is between repeat_nmi and
|
||||
+ * end_repeat_nmi, then we must not modify the "iret" frame
|
||||
+ * because it's being written by the outer NMI. That's okay;
|
||||
+ * the outer NMI handler is about to call do_nmi anyway,
|
||||
+ * so we can just resume the outer NMI.
|
||||
*/
|
||||
movq $repeat_nmi, %rdx
|
||||
cmpq 8(%rsp), %rdx
|
||||
@@ -1550,7 +1595,10 @@ nested_nmi:
|
||||
ja nested_nmi_out
|
||||
|
||||
1:
|
||||
- /* Set up the interrupted NMIs stack to jump to repeat_nmi */
|
||||
+ /*
|
||||
+ * Modify the "iret" frame to point to repeat_nmi, forcing another
|
||||
+ * iteration of NMI handling.
|
||||
+ */
|
||||
leaq -1*8(%rsp), %rdx
|
||||
movq %rdx, %rsp
|
||||
CFI_ADJUST_CFA_OFFSET 1*8
|
||||
@@ -1569,60 +1617,23 @@ nested_nmi_out:
|
||||
popq_cfi %rdx
|
||||
CFI_RESTORE rdx
|
||||
|
||||
- /* No need to check faults here */
|
||||
+ /* We are returning to kernel mode, so this cannot result in a fault. */
|
||||
INTERRUPT_RETURN
|
||||
|
||||
CFI_RESTORE_STATE
|
||||
first_nmi:
|
||||
- /*
|
||||
- * Because nested NMIs will use the pushed location that we
|
||||
- * stored in rdx, we must keep that space available.
|
||||
- * Here's what our stack frame will look like:
|
||||
- * +-------------------------+
|
||||
- * | original SS |
|
||||
- * | original Return RSP |
|
||||
- * | original RFLAGS |
|
||||
- * | original CS |
|
||||
- * | original RIP |
|
||||
- * +-------------------------+
|
||||
- * | temp storage for rdx |
|
||||
- * +-------------------------+
|
||||
- * | NMI executing variable |
|
||||
- * +-------------------------+
|
||||
- * | copied SS |
|
||||
- * | copied Return RSP |
|
||||
- * | copied RFLAGS |
|
||||
- * | copied CS |
|
||||
- * | copied RIP |
|
||||
- * +-------------------------+
|
||||
- * | Saved SS |
|
||||
- * | Saved Return RSP |
|
||||
- * | Saved RFLAGS |
|
||||
- * | Saved CS |
|
||||
- * | Saved RIP |
|
||||
- * +-------------------------+
|
||||
- * | pt_regs |
|
||||
- * +-------------------------+
|
||||
- *
|
||||
- * The saved stack frame is used to fix up the copied stack frame
|
||||
- * that a nested NMI may change to make the interrupted NMI iret jump
|
||||
- * to the repeat_nmi. The original stack frame and the temp storage
|
||||
- * is also used by nested NMIs and can not be trusted on exit.
|
||||
- */
|
||||
- /* Do not pop rdx, nested NMIs will corrupt that part of the stack */
|
||||
+ /* Restore rdx. */
|
||||
movq (%rsp), %rdx
|
||||
CFI_RESTORE rdx
|
||||
|
||||
- /* Set the NMI executing variable on the stack. */
|
||||
+ /* Set "NMI executing" on the stack. */
|
||||
pushq_cfi $1
|
||||
|
||||
- /*
|
||||
- * Leave room for the "copied" frame
|
||||
- */
|
||||
+ /* Leave room for the "iret" frame */
|
||||
subq $(5*8), %rsp
|
||||
CFI_ADJUST_CFA_OFFSET 5*8
|
||||
|
||||
- /* Copy the stack frame to the Saved frame */
|
||||
+ /* Copy the "original" frame to the "outermost" frame */
|
||||
.rept 5
|
||||
pushq_cfi 11*8(%rsp)
|
||||
.endr
|
||||
@@ -1630,6 +1641,7 @@ first_nmi:
|
||||
|
||||
/* Everything up to here is safe from nested NMIs */
|
||||
|
||||
+repeat_nmi:
|
||||
/*
|
||||
* If there was a nested NMI, the first NMI's iret will return
|
||||
* here. But NMIs are still enabled and we can take another
|
||||
@@ -1638,16 +1650,21 @@ first_nmi:
|
||||
* it will just return, as we are about to repeat an NMI anyway.
|
||||
* This makes it safe to copy to the stack frame that a nested
|
||||
* NMI will update.
|
||||
- */
|
||||
-repeat_nmi:
|
||||
- /*
|
||||
- * Update the stack variable to say we are still in NMI (the update
|
||||
- * is benign for the non-repeat case, where 1 was pushed just above
|
||||
- * to this very stack slot).
|
||||
+ *
|
||||
+ * RSP is pointing to "outermost RIP". gsbase is unknown, but, if
|
||||
+ * we're repeating an NMI, gsbase has the same value that it had on
|
||||
+ * the first iteration. paranoid_entry will load the kernel
|
||||
+ * gsbase if needed before we call do_nmi.
|
||||
+ *
|
||||
+ * Set "NMI executing" in case we came back here via IRET.
|
||||
*/
|
||||
movq $1, 10*8(%rsp)
|
||||
|
||||
- /* Make another copy, this one may be modified by nested NMIs */
|
||||
+ /*
|
||||
+ * Copy the "outermost" frame to the "iret" frame. NMIs that nest
|
||||
+ * here must not modify the "iret" frame while we're writing to
|
||||
+ * it or it will end up containing garbage.
|
||||
+ */
|
||||
addq $(10*8), %rsp
|
||||
CFI_ADJUST_CFA_OFFSET -10*8
|
||||
.rept 5
|
||||
@@ -1658,9 +1675,9 @@ repeat_nmi:
|
||||
end_repeat_nmi:
|
||||
|
||||
/*
|
||||
- * Everything below this point can be preempted by a nested
|
||||
- * NMI if the first NMI took an exception and reset our iret stack
|
||||
- * so that we repeat another NMI.
|
||||
+ * Everything below this point can be preempted by a nested NMI.
|
||||
+ * If this happens, then the inner NMI will change the "iret"
|
||||
+ * frame to point back to repeat_nmi.
|
||||
*/
|
||||
pushq_cfi $-1 /* ORIG_RAX: no syscall to restart */
|
||||
ALLOC_PT_GPREGS_ON_STACK
|
||||
@@ -1687,11 +1704,18 @@ nmi_swapgs:
|
||||
nmi_restore:
|
||||
RESTORE_EXTRA_REGS
|
||||
RESTORE_C_REGS
|
||||
- /* Pop the extra iret frame at once */
|
||||
+
|
||||
+ /* Point RSP at the "iret" frame. */
|
||||
REMOVE_PT_GPREGS_FROM_STACK 6*8
|
||||
|
||||
- /* Clear the NMI executing stack variable */
|
||||
+ /* Clear "NMI executing". */
|
||||
movq $0, 5*8(%rsp)
|
||||
+
|
||||
+ /*
|
||||
+ * INTERRUPT_RETURN reads the "iret" frame and exits the NMI
|
||||
+ * stack in a single instruction. We are returning to kernel
|
||||
+ * mode, so this cannot result in a fault.
|
||||
+ */
|
||||
INTERRUPT_RETURN
|
||||
CFI_ENDPROC
|
||||
END(nmi)
|
||||
--- a/arch/x86/kernel/nmi.c
|
||||
+++ b/arch/x86/kernel/nmi.c
|
||||
@@ -408,8 +408,8 @@ static void default_do_nmi(struct pt_reg
|
||||
NOKPROBE_SYMBOL(default_do_nmi);
|
||||
|
||||
/*
|
||||
- * NMIs can hit breakpoints which will cause it to lose its NMI context
|
||||
- * with the CPU when the breakpoint or page fault does an IRET.
|
||||
+ * NMIs can page fault or hit breakpoints which will cause it to lose
|
||||
+ * its NMI context with the CPU when the breakpoint or page fault does an IRET.
|
||||
*
|
||||
* As a result, NMIs can nest if NMIs get unmasked due an IRET during
|
||||
* NMI processing. On x86_64, the asm glue protects us from nested NMIs
|
|
@ -1,91 +0,0 @@
|
|||
From: Andy Lutomirski <luto@kernel.org>
|
||||
Date: Wed, 15 Jul 2015 10:29:37 -0700
|
||||
Subject: [8/9] x86/nmi/64: Reorder nested NMI checks
|
||||
Origin: https://git.kernel.org/linus/a27507ca2d796cfa8d907de31ad730359c8a6d06
|
||||
|
||||
Check the repeat_nmi .. end_repeat_nmi special case first. The
|
||||
next patch will rework the RSP check and, as a side effect, the
|
||||
RSP check will no longer detect repeat_nmi .. end_repeat_nmi, so
|
||||
we'll need this ordering of the checks.
|
||||
|
||||
Note: this is more subtle than it appears. The check for
|
||||
repeat_nmi .. end_repeat_nmi jumps straight out of the NMI code
|
||||
instead of adjusting the "iret" frame to force a repeat. This
|
||||
is necessary, because the code between repeat_nmi and
|
||||
end_repeat_nmi sets "NMI executing" and then writes to the
|
||||
"iret" frame itself. If a nested NMI comes in and modifies the
|
||||
"iret" frame while repeat_nmi is also modifying it, we'll end up
|
||||
with garbage. The old code got this right, as does the new
|
||||
code, but the new code is a bit more explicit.
|
||||
|
||||
If we were to move the check right after the "NMI executing"
|
||||
check, then we'd get it wrong and have random crashes.
|
||||
|
||||
( Because the "NMI executing" check would jump to the code that would
|
||||
modify the "iret" frame without checking if the interrupted NMI was
|
||||
currently modifying it. )
|
||||
|
||||
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
||||
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
|
||||
Cc: Borislav Petkov <bp@suse.de>
|
||||
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
||||
Cc: Peter Zijlstra <peterz@infradead.org>
|
||||
Cc: Thomas Gleixner <tglx@linutronix.de>
|
||||
Cc: stable@vger.kernel.org
|
||||
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
||||
[bwh: Backported to 4.1: adjust filename, spacing]
|
||||
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
|
||||
---
|
||||
arch/x86/kernel/entry_64.S | 34 ++++++++++++++++++----------------
|
||||
1 file changed, 18 insertions(+), 16 deletions(-)
|
||||
|
||||
--- a/arch/x86/kernel/entry_64.S
|
||||
+++ b/arch/x86/kernel/entry_64.S
|
||||
@@ -1554,7 +1554,24 @@ ENTRY(nmi)
|
||||
/*
|
||||
* Determine whether we're a nested NMI.
|
||||
*
|
||||
- * First check "NMI executing". If it's set, then we're nested.
|
||||
+ * If we interrupted kernel code between repeat_nmi and
|
||||
+ * end_repeat_nmi, then we are a nested NMI. We must not
|
||||
+ * modify the "iret" frame because it's being written by
|
||||
+ * the outer NMI. That's okay; the outer NMI handler is
|
||||
+ * about to about to call do_nmi anyway, so we can just
|
||||
+ * resume the outer NMI.
|
||||
+ */
|
||||
+
|
||||
+ movq $repeat_nmi, %rdx
|
||||
+ cmpq 8(%rsp), %rdx
|
||||
+ ja 1f
|
||||
+ movq $end_repeat_nmi, %rdx
|
||||
+ cmpq 8(%rsp), %rdx
|
||||
+ ja nested_nmi_out
|
||||
+1:
|
||||
+
|
||||
+ /*
|
||||
+ * Now check "NMI executing". If it's set, then we're nested.
|
||||
* This will not detect if we interrupted an outer NMI just
|
||||
* before IRET.
|
||||
*/
|
||||
@@ -1581,21 +1598,6 @@ ENTRY(nmi)
|
||||
|
||||
nested_nmi:
|
||||
/*
|
||||
- * If we interrupted an NMI that is between repeat_nmi and
|
||||
- * end_repeat_nmi, then we must not modify the "iret" frame
|
||||
- * because it's being written by the outer NMI. That's okay;
|
||||
- * the outer NMI handler is about to call do_nmi anyway,
|
||||
- * so we can just resume the outer NMI.
|
||||
- */
|
||||
- movq $repeat_nmi, %rdx
|
||||
- cmpq 8(%rsp), %rdx
|
||||
- ja 1f
|
||||
- movq $end_repeat_nmi, %rdx
|
||||
- cmpq 8(%rsp), %rdx
|
||||
- ja nested_nmi_out
|
||||
-
|
||||
-1:
|
||||
- /*
|
||||
* Modify the "iret" frame to point to repeat_nmi, forcing another
|
||||
* iteration of NMI handling.
|
||||
*/
|
|
@ -1,90 +0,0 @@
|
|||
From: Andy Lutomirski <luto@kernel.org>
|
||||
Date: Wed, 15 Jul 2015 10:29:38 -0700
|
||||
Subject: x86/nmi/64: Use DF to avoid userspace RSP confusing nested NMI
|
||||
detection
|
||||
Origin: https://git.kernel.org/linus/810bc075f78ff2c221536eb3008eac6a492dba2d
|
||||
|
||||
We have a tricky bug in the nested NMI code: if we see RSP
|
||||
pointing to the NMI stack on NMI entry from kernel mode, we
|
||||
assume that we are executing a nested NMI.
|
||||
|
||||
This isn't quite true. A malicious userspace program can point
|
||||
RSP at the NMI stack, issue SYSCALL, and arrange for an NMI to
|
||||
happen while RSP is still pointing at the NMI stack.
|
||||
|
||||
Fix it with a sneaky trick. Set DF in the region of code that
|
||||
the RSP check is intended to detect. IRET will clear DF
|
||||
atomically.
|
||||
|
||||
( Note: other than paravirt, there's little need for all this
|
||||
complexity. We could check RIP instead of RSP. )
|
||||
|
||||
Signed-off-by: Andy Lutomirski <luto@kernel.org>
|
||||
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
|
||||
Cc: Borislav Petkov <bp@suse.de>
|
||||
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
||||
Cc: Peter Zijlstra <peterz@infradead.org>
|
||||
Cc: Thomas Gleixner <tglx@linutronix.de>
|
||||
Cc: stable@vger.kernel.org
|
||||
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
||||
[bwh: Backported to 4.1: adjust filename, context]
|
||||
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
|
||||
---
|
||||
arch/x86/kernel/entry_64.S | 29 +++++++++++++++++++++++++----
|
||||
1 file changed, 25 insertions(+), 4 deletions(-)
|
||||
|
||||
--- a/arch/x86/kernel/entry_64.S
|
||||
+++ b/arch/x86/kernel/entry_64.S
|
||||
@@ -1581,7 +1581,14 @@ ENTRY(nmi)
|
||||
/*
|
||||
* Now test if the previous stack was an NMI stack. This covers
|
||||
* the case where we interrupt an outer NMI after it clears
|
||||
- * "NMI executing" but before IRET.
|
||||
+ * "NMI executing" but before IRET. We need to be careful, though:
|
||||
+ * there is one case in which RSP could point to the NMI stack
|
||||
+ * despite there being no NMI active: naughty userspace controls
|
||||
+ * RSP at the very beginning of the SYSCALL targets. We can
|
||||
+ * pull a fast one on naughty userspace, though: we program
|
||||
+ * SYSCALL to mask DF, so userspace cannot cause DF to be set
|
||||
+ * if it controls the kernel's RSP. We set DF before we clear
|
||||
+ * "NMI executing".
|
||||
*/
|
||||
lea 6*8(%rsp), %rdx
|
||||
/* Compare the NMI stack (rdx) with the stack we came from (4*8(%rsp)) */
|
||||
@@ -1592,10 +1599,16 @@ ENTRY(nmi)
|
||||
cmpq %rdx, 4*8(%rsp)
|
||||
/* If it is below the NMI stack, it is a normal NMI */
|
||||
jb first_nmi
|
||||
- /* Ah, it is within the NMI stack, treat it as nested */
|
||||
+
|
||||
+ /* Ah, it is within the NMI stack. */
|
||||
+
|
||||
+ testb $(X86_EFLAGS_DF >> 8), (3*8 + 1)(%rsp)
|
||||
+ jz first_nmi /* RSP was user controlled. */
|
||||
|
||||
CFI_REMEMBER_STATE
|
||||
|
||||
+ /* This is a nested NMI. */
|
||||
+
|
||||
nested_nmi:
|
||||
/*
|
||||
* Modify the "iret" frame to point to repeat_nmi, forcing another
|
||||
@@ -1710,8 +1723,16 @@ nmi_restore:
|
||||
/* Point RSP at the "iret" frame. */
|
||||
REMOVE_PT_GPREGS_FROM_STACK 6*8
|
||||
|
||||
- /* Clear "NMI executing". */
|
||||
- movq $0, 5*8(%rsp)
|
||||
+ /*
|
||||
+ * Clear "NMI executing". Set DF first so that we can easily
|
||||
+ * distinguish the remaining code between here and IRET from
|
||||
+ * the SYSCALL entry and exit paths. On a native kernel, we
|
||||
+ * could just inspect RIP, but, on paravirt kernels,
|
||||
+ * INTERRUPT_RETURN can translate into a jump into a
|
||||
+ * hypercall page.
|
||||
+ */
|
||||
+ std
|
||||
+ movq $0, 5*8(%rsp) /* clear "NMI executing" */
|
||||
|
||||
/*
|
||||
* INTERRUPT_RETURN reads the "iret" frame and exits the NMI
|
|
@ -1,24 +0,0 @@
|
|||
From: Paolo Bonzini <pbonzini@redhat.com>
|
||||
Date: Sat, 30 May 2015 14:31:24 +0200
|
||||
Subject: kvm: x86: fix kvm_apic_has_events to check for NULL pointer
|
||||
Origin: https://git.kernel.org/linus/ce40cd3fc7fa40a6119e5fe6c0f2bc0eb4541009
|
||||
|
||||
Malicious (or egregiously buggy) userspace can trigger it, but it
|
||||
should never happen in normal operation.
|
||||
|
||||
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
||||
---
|
||||
arch/x86/kvm/lapic.h | 2 +-
|
||||
1 file changed, 1 insertion(+), 1 deletion(-)
|
||||
|
||||
--- a/arch/x86/kvm/lapic.h
|
||||
+++ b/arch/x86/kvm/lapic.h
|
||||
@@ -165,7 +165,7 @@ static inline u16 apic_logical_id(struct
|
||||
|
||||
static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
- return vcpu->arch.apic->pending_events;
|
||||
+ return kvm_vcpu_has_lapic(vcpu) && vcpu->arch.apic->pending_events;
|
||||
}
|
||||
|
||||
bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
|
|
@ -81,16 +81,6 @@ features/all/efi-autoload-efi-pstore.patch
|
|||
features/all/cpufreq-dt-allow-driver-to-boot-automatically.patch
|
||||
features/all/regulator-axp20x-Add-module-alias.patch
|
||||
|
||||
bugfix/x86/kvm-x86-fix-kvm_apic_has_events-to-check-for-null-po.patch
|
||||
bugfix/x86/0003-x86-asm-entry-64-Remove-pointless-jump-to-irq_return.patch
|
||||
bugfix/x86/0004-x86-nmi-Enable-nested-do_nmi-handling-for-64-bit-ker.patch
|
||||
bugfix/x86/0005-x86-nmi-64-Remove-asm-code-that-saves-cr2.patch
|
||||
bugfix/x86/0006-x86-nmi-64-Switch-stacks-on-userspace-NMI-entry.patch
|
||||
bugfix/x86/0007-x86-nmi-64-Improve-nested-NMI-comments.patch
|
||||
bugfix/x86/0008-x86-nmi-64-Reorder-nested-NMI-checks.patch
|
||||
bugfix/x86/0009-x86-nmi-64-Use-DF-to-avoid-userspace-RSP-confusing-n.patch
|
||||
bugfix/all/md-use-kzalloc-when-bitmap-is-disabled.patch
|
||||
|
||||
# Hardening from grsecurity
|
||||
features/all/grsecurity/grsecurity-kconfig.patch
|
||||
# Disabled until we add code into the grsecurity/ directory
|
||||
|
|
Loading…
Reference in New Issue