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KVM: x86 emulator: refuse SrcMemFAddr (e.g. LDS) with register operand

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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>
This commit is contained in:
Avi Kivity 2010-08-26 11:06:15 +03:00
parent d2ddd1c483
commit 081bca0e6b
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kvm/emulate.c
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@ -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);