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| author | Jim Mattson <jmattson@google.com> | 2017-05-23 11:52:54 -0700 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2017-06-07 16:28:55 +0200 |
| commit | 4531662d1abf6c1f0e5c2b86ddb60e61509786c8 (patch) | |
| tree | 9286a5be696514f307a64bf21328ab7a14d56725 /arch/x86/kvm | |
| parent | 4439af9f911ae0243ffe4e2dfc12bace49605d8b (diff) | |
| download | linux-4531662d1abf6c1f0e5c2b86ddb60e61509786c8.tar.gz | |
kvm: vmx: Check value written to IA32_BNDCFGS
Bits 11:2 must be zero and the linear addess in bits 63:12 must be
canonical. Otherwise, WRMSR(BNDCFGS) should raise #GP.
Fixes: 0dd376e709975779 ("KVM: x86: add MSR_IA32_BNDCFGS to msrs_to_save")
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index a339e97e26a3..39301297352a 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3279,6 +3279,9 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) case MSR_IA32_BNDCFGS: if (!kvm_mpx_supported() || !guest_cpuid_has_mpx(vcpu)) return 1; + if (is_noncanonical_address(data & PAGE_MASK) || + (data & MSR_IA32_BNDCFGS_RSVD)) + return 1; vmcs_write64(GUEST_BNDCFGS, data); break; case MSR_IA32_TSC: |