KVM: x86: Decoding guest instructions which cross page boundary may fail
authorNadav Amit <namit@cs.technion.ac.il>
Thu, 2 Oct 2014 22:10:04 +0000 (01:10 +0300)
committerPaolo Bonzini <pbonzini@redhat.com>
Fri, 24 Oct 2014 11:21:18 +0000 (13:21 +0200)
commit08da44aedba0f493e10695fa334348a7a4f72eb3
tree0a2194efd8b9a542f208337f16a67e8807deb417
parent2bc19dc3754fc066c43799659f0d848631c44cfe
KVM: x86: Decoding guest instructions which cross page boundary may fail

Once an instruction crosses a page boundary, the size read from the second page
disregards the common case that part of the operand resides on the first page.
As a result, fetch of long insturctions may fail, and thereby cause the
decoding to fail as well.

Cc: stable@vger.kernel.org
Fixes: 5cfc7e0f5e5e1adf998df94f8e36edaf5d30d38e
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/emulate.c