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

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commit 8b9f44140b upstream.

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

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Gleb Natapov
2010-02-18 12:14:59 +02:00
committed by Greg Kroah-Hartman
parent 1c731613a9
commit 8bc4cf28e8
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kvm/emulate.c
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@@ -1987,6 +1987,12 @@ 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);