From: Sean Christopherson sean.j.christopherson@intel.com
commit fe6ed369fca98e99df55c932b85782a5687526b5 upstream.
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: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kvm/vmx/vmx.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2140,6 +2140,8 @@ static int vmx_set_msr(struct kvm_vcpu * (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