From: Andy Honig Date: Tue, 17 May 2016 15:41:47 +0000 (+0200) Subject: KVM: MTRR: remove MSR 0x2f8 X-Git-Tag: v4.14-rc1~3123^2~12 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9842df62004f366b9fed2423e24df10542ee0dc5;p=platform%2Fkernel%2Flinux-rpi.git KVM: MTRR: remove MSR 0x2f8 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-2016-3713. Fixes: 910a6aae4e2e ("KVM: MTRR: exactly define the size of variable MTRRs") Cc: stable@vger.kernel.org Reported-by: David Matlack Signed-off-by: Andy Honig Signed-off-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c index 3f8c732..c146f3c 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; }