diff options
Diffstat (limited to 'KVM-MTRR-remove-MSR-0x2f8.patch')
| -rw-r--r-- | KVM-MTRR-remove-MSR-0x2f8.patch | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/KVM-MTRR-remove-MSR-0x2f8.patch b/KVM-MTRR-remove-MSR-0x2f8.patch deleted file mode 100644 index 8066b2e8f..000000000 --- a/KVM-MTRR-remove-MSR-0x2f8.patch +++ /dev/null @@ -1,49 +0,0 @@ -From bb0f06280beb6507226627a85076ae349a23fe22 Mon Sep 17 00:00:00 2001 -From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com> -Date: Mon, 16 May 2016 09:45:35 -0400 -Subject: [PATCH] KVM: MTRR: remove MSR 0x2f8 -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -MSR 0x2f8 accessed the 124th Variable Range MTRR ever since MTRR support -was introduced by 9ba075a664df ("KVM: MTRR support"). - -0x2f8 became harmful when 910a6aae4e2e ("KVM: MTRR: exactly define the -size of variable MTRRs") shrinked the array of VR MTRRs from 256 to 8, -which made access to index 124 out of bounds. The surrounding code only -WARNs in this situation, thus the guest gained a limited read/write -access to struct kvm_arch_vcpu. - -0x2f8 is not a valid VR MTRR MSR, because KVM has/advertises only 16 VR -MTRR MSRs, 0x200-0x20f. Every VR MTRR is set up using two MSRs, 0x2f8 -was treated as a PHYSBASE and 0x2f9 would be its PHYSMASK, but 0x2f9 was -not implemented in KVM, therefore 0x2f8 could never do anything useful -and getting rid of it is safe. - -This fixes CVE-2016-TBD. - -Fixes: 910a6aae4e2e ("KVM: MTRR: exactly define the size of variable MTRRs") -Cc: stable@vger.kernel.org -Reported-by: David Matlack <dmatlack@google.com> -Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> ---- - arch/x86/kvm/mtrr.c | 2 -- - 1 file changed, 2 deletions(-) - -diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c -index 3f8c732117ec..c146f3c262c3 100644 ---- a/arch/x86/kvm/mtrr.c -+++ b/arch/x86/kvm/mtrr.c -@@ -44,8 +44,6 @@ static bool msr_mtrr_valid(unsigned msr) - case MSR_MTRRdefType: - case MSR_IA32_CR_PAT: - return true; -- case 0x2f8: -- return true; - } - return false; - } --- -2.5.5 - |