[PATCH 5.12 007/292] KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA

[Greg Kroah-Hartman]

From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

commit fce7e152ffc8f89d02a80617b16c7aa1527847c8 upstream.

APM states that #GP is raised upon write to MSR_VM_HSAVE_PA when
the supplied address is not page-aligned or is outside of "maximum
supported physical address for this implementation".
page_address_valid() check seems suitable. Also, forcefully page-align
the address when it's written from VMM.

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Message-Id: <20210628104425.391276-2-vkuznets@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
[Add comment about behavior for host-provided values. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/x86/kvm/svm/svm.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2982,7 +2982,16 @@ static int svm_set_msr(struct kvm_vcpu *
 			svm_disable_lbrv(vcpu);
 		break;
 	case MSR_VM_HSAVE_PA:
-		svm->nested.hsave_msr = data;
+		/*
+		 * Old kernels did not validate the value written to
+		 * MSR_VM_HSAVE_PA.  Allow KVM_SET_MSR to set an invalid
+		 * value to allow live migrating buggy or malicious guests
+		 * originating from those kernels.
+		 */
+		if (!msr->host_initiated && !page_address_valid(vcpu, data))
+			return 1;
+
+		svm->nested.hsave_msr = data & PAGE_MASK;
 		break;
 	case MSR_VM_CR:
 		return svm_set_vm_cr(vcpu, data);