* [PATCH] KVM: x86 emulator: refuse SrcMemFAddr (e.g. LDS) with register operand
@ 2010-08-26 8:06 Avi Kivity
2010-08-26 17:34 ` Marcelo Tosatti
0 siblings, 1 reply; 2+ messages in thread
From: Avi Kivity @ 2010-08-26 8:06 UTC (permalink / raw)
To: Marcelo Tosatti, kvm
SrcMemFAddr is not defined with the modrm operand designating a register
instead of a memory address.
Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/emulate.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index d613690..36b0e29 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2957,6 +2957,11 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
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);
--
1.7.1
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2010-08-26 8:06 [PATCH] KVM: x86 emulator: refuse SrcMemFAddr (e.g. LDS) with register operand Avi Kivity
2010-08-26 17:34 ` Marcelo Tosatti
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