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[x86] KVM: nVMX: update last_nonleaf_level when initializing nested EPT (CVE-2017-12188)

This commit is contained in:
Salvatore Bonaccorso 2017-10-13 18:06:46 +02:00
parent 52c8b81bca
commit 02033a7a17
3 changed files with 37 additions and 0 deletions
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2
debian/changelog vendored
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@ -14,6 +14,8 @@ linux (4.13.4-2) UNRELEASED; urgency=medium
* KEYS: prevent KEYCTL_READ on negative key (CVE-2017-12192)
* waitid(): Add missing access_ok() checks (CVE-2017-5123)
* ALSA: seq: Fix use-after-free at creating a port (CVE-2017-15265)
* [x86] KVM: nVMX: update last_nonleaf_level when initializing nested EPT
(CVE-2017-12188)
-- Ben Hutchings <ben@decadent.org.uk> Wed, 04 Oct 2017 23:14:54 +0100

34
debian/patches/bugfix/x86/KVM-nVMX-update-last_nonleaf_level-when-initializing.patch vendored Normal file
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@ -0,0 +1,34 @@
From: Ladi Prosek <lprosek@redhat.com>
Date: Thu, 5 Oct 2017 11:10:22 +0200
Subject: KVM: nVMX: update last_nonleaf_level when initializing nested EPT
Origin: https://git.kernel.org/linus/fd19d3b45164466a4adce7cbff448ba9189e1427
Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-12188
The function updates context->root_level but didn't call
update_last_nonleaf_level so the previous and potentially wrong value
was used for page walks. For example, a zero value of last_nonleaf_level
would allow a potential out-of-bounds access in arch/x86/mmu/paging_tmpl.h's
walk_addr_generic function (CVE-2017-12188).
Fixes: 155a97a3d7c78b46cef6f1a973c831bc5a4f82bb
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/mmu.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 106d4a029a8a..3c25f20115bc 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4555,6 +4555,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
update_permission_bitmask(vcpu, context, true);
update_pkru_bitmask(vcpu, context, true);
+ update_last_nonleaf_level(vcpu, context);
reset_rsvds_bits_mask_ept(vcpu, context, execonly);
reset_ept_shadow_zero_bits_mask(vcpu, context, execonly);
}
--
2.11.0

1
debian/patches/series vendored
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@ -126,6 +126,7 @@ bugfix/all/powerpc-tm-Fix-illegal-TM-state-in-signal-handler.patch
bugfix/all/KEYS-prevent-KEYCTL_READ-on-negative-key.patch
bugfix/all/waitid-Add-missing-access_ok-checks.patch
bugfix/all/ALSA-seq-Fix-use-after-free-at-creating-a-port.patch
bugfix/x86/KVM-nVMX-update-last_nonleaf_level-when-initializing.patch
# Fix exported symbol versions
bugfix/alpha/alpha-restore-symbol-versions-for-symbols-exported-f.patch