Patch-mainline: v5.6-rc1
Git-commit: fe6ed369fca98e99df55c932b85782a5687526b5
References: git-fixes
From: Sean Christopherson <sean.j.christopherson@intel.com>
Date: Tue, 10 Dec 2019 15:24:32 -0800
Subject: [PATCH] KVM: VMX: Add non-canonical check on writes to RTIT address
MSRs
Reject writes to RTIT address MSRs if the data being written is a
non-canonical address as the MSRs are subject to canonical checks, e.g.
KVM will trigger an unchecked #GP when loading the values to hardware
during pt_guest_enter().
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/kvm/vmx/vmx.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c2ced79aee3e..aea4fa957fd2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2144,6 +2144,8 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
(index >= 2 * intel_pt_validate_cap(vmx->pt_desc.caps,
PT_CAP_num_address_ranges)))
return 1;
+ if (is_noncanonical_address(data, vcpu))
+ return 1;
if (index % 2)
vmx->pt_desc.guest.addr_b[index / 2] = data;
else
--
2.35.3