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KVM: x86: fix use of uninitialized memory as segment descriptor in emulator. 

If VMX reports segment as unusable, zero descriptor passed by the emulator
before returning. Such descriptor will be considered not present by the
emulator.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2013-01-21 15:36:48 +02:00 committed by Marcelo Tosatti
parent 91b0aa2ca6
commit 378a8b099f
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/x86.c
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@ -4489,8 +4489,10 @@ static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
*selector = var.selector;
if (var.unusable)
if (var.unusable) {
memset(desc, 0, sizeof(*desc));
return false;
}
if (var.g)
var.limit >>= 12;