kvm: nVMX: Don't allow L2 to access the hardware CR8

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commit 51aa68e7d5 upstream.

If L1 does not specify the "use TPR shadow" VM-execution control in
vmcs12, then L0 must specify the "CR8-load exiting" and "CR8-store
exiting" VM-execution controls in vmcs02. Failure to do so will give
the L2 VM unrestricted read/write access to the hardware CR8.

This fixes CVE-2017-12154.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Jim Mattson 2017-09-12 13:02:54 -07:00 • committed by Ben Hutchings

parent ed2305f2eb

commit 423a7a81ef

1 changed files with 8 additions and 0 deletions

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arch/x86/kvm/vmx.c

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