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| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-27 15:00:37 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-27 15:04:49 +0200 |
| commit | 0f02bd0ade9a552492463c0159abbe26c4d92b40 (patch) | |
| tree | d9caefa4c391d455f3282981673443684a32c1b2 /arch/x86/kvm/vmx/nested.h | |
| parent | selftests: kvm: do not set guest mode flag (diff) | |
| download | linux-0f02bd0ade9a552492463c0159abbe26c4d92b40.tar.xz linux-0f02bd0ade9a552492463c0159abbe26c4d92b40.zip | |
KVM: nVMX: check for required but missing VMCS12 in KVM_SET_NESTED_STATE
A missing VMCS12 was not causing -EINVAL (it was just read with
copy_from_user, so it is not a security issue, but it is still
wrong). Test for VMCS12 validity and reject the nested state
if a VMCS12 is required but not present.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/nested.h')
| -rw-r--r-- | arch/x86/kvm/vmx/nested.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h index 758bccc26cf9..197148d76b8f 100644 --- a/arch/x86/kvm/vmx/nested.h +++ b/arch/x86/kvm/vmx/nested.h @@ -47,6 +47,11 @@ static inline struct vmcs12 *get_shadow_vmcs12(struct kvm_vcpu *vcpu) return to_vmx(vcpu)->nested.cached_shadow_vmcs12; } +/* + * Note: the same condition is checked against the state provided by userspace + * in vmx_set_nested_state; if it is satisfied, the nested state must include + * the VMCS12. + */ static inline int vmx_has_valid_vmcs12(struct kvm_vcpu *vcpu) { struct vcpu_vmx *vmx = to_vmx(vcpu); |