KVM: nVMX: add missing consistency checks for CR0 and CR4

commit 595c145377da910f0164eca2216fe3caf4fff4de upstream.

The effective values of the guest CR0 and CR4 registers may differ from
those included in the VMCS12.  In particular, disabling EPT forces
CR4.PAE=1 and disabling unrestricted guest mode forces CR0.PG=CR0.PE=1.

Therefore, checks on these bits cannot be delegated to the processor
and must be performed by KVM.

Reported-by: Reima ISHII <ishiir@g.ecc.u-tokyo.ac.jp>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index df8995977ec2d42d910c1fbfcbbedf14bb84ce38..1d00f7824da1e23933e3d483a3854e7ca7838d92 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2999,7 +2999,7 @@ static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu,
                                        struct vmcs12 *vmcs12,
                                        enum vm_entry_failure_code *entry_failure_code)
 {
-       bool ia32e;
+       bool ia32e = !!(vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE);
 
        *entry_failure_code = ENTRY_FAIL_DEFAULT;
 
@@ -3025,6 +3025,13 @@ static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu,
                                           vmcs12->guest_ia32_perf_global_ctrl)))
                return -EINVAL;
 
+       if (CC((vmcs12->guest_cr0 & (X86_CR0_PG | X86_CR0_PE)) == X86_CR0_PG))
+               return -EINVAL;
+
+       if (CC(ia32e && !(vmcs12->guest_cr4 & X86_CR4_PAE)) ||
+           CC(ia32e && !(vmcs12->guest_cr0 & X86_CR0_PG)))
+               return -EINVAL;
+
        /*
         * If the load IA32_EFER VM-entry control is 1, the following checks
         * are performed on the field for the IA32_EFER MSR:
@@ -3036,7 +3043,6 @@ static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu,
         */
        if (to_vmx(vcpu)->nested.nested_run_pending &&
            (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) {
-               ia32e = (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) != 0;
                if (CC(!kvm_valid_efer(vcpu, vmcs12->guest_ia32_efer)) ||
                    CC(ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA)) ||
                    CC(((vmcs12->guest_cr0 & X86_CR0_PG) &&