KVM: x86 emulator: refuse SrcMemFAddr (e.g. LDS) with register operand
SrcMemFAddr is not defined with the modrm operand designating a register
instead of a memory address.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ec35a71..2b9b0fe 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2974,6 +2974,11 @@
goto done;
}
+ if ((c->d & SrcMask) == SrcMemFAddr && c->src.type != OP_MEM) {
+ emulate_ud(ctxt);
+ goto done;
+ }
+
/* Privileged instruction can be executed only in CPL=0 */
if ((c->d & Priv) && ops->cpl(ctxt->vcpu)) {
emulate_gp(ctxt, 0);