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authorMaxim Levitsky <mlevitsk@redhat.com>2021-07-19 16:05:00 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2021-08-16 09:48:37 -0400
commitc7dfa4009965a9b2d7b329ee970eb8da0d32f0bc (patch)
tree42c6b74cec101cdffce4c14e608b4c672adb4b61 /mm
parent0f923e07124df069ba68d8bb12324398f4b6b709 (diff)
KVM: nSVM: always intercept VMLOAD/VMSAVE when nested (CVE-2021-3656)
If L1 disables VMLOAD/VMSAVE intercepts, and doesn't enable Virtual VMLOAD/VMSAVE (currently not supported for the nested hypervisor), then VMLOAD/VMSAVE must operate on the L1 physical memory, which is only possible by making L0 intercept these instructions. Failure to do so allowed the nested guest to run VMLOAD/VMSAVE unintercepted, and thus read/write portions of the host physical memory. Fixes: 89c8a4984fc9 ("KVM: SVM: Enable Virtual VMLOAD VMSAVE feature") Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'mm')
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