From: Avi Kivity <avi@redhat.com>
Date: Thu, 26 Aug 2010 08:06:15 +0000 (+0300)
Subject: KVM: x86 emulator: refuse SrcMemFAddr (e.g. LDS) with register operand
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=081bca0e6b87d0c7b9ade7ffee1f44aca336a8fa;p=linux-beck.git

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 ec35a71d8b5d..2b9b0feabdba 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2974,6 +2974,11 @@ 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);