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KVM: x86 emulator: Forbid modifying CS segment register by mov instruction

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Inject #UD if guest attempts to do so. This is in accordance to Intel
SDM.

Cc: stable@kernel.org (2.6.33, 2.6.32)
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-02-18 12:14:59 +02:00 committed by Marcelo Tosatti
parent 70e335e168
commit 8b9f44140b
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kvm/emulate.c
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@ -2126,6 +2126,12 @@ special_insn:
int err;
sel = c->src.val;
if (c->modrm_reg == VCPU_SREG_CS) {
kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
goto done;
}
if (c->modrm_reg == VCPU_SREG_SS)
toggle_interruptibility(ctxt, X86_SHADOW_INT_MOV_SS);