In one occassion, decode_modrm uses the rm field after it is extended with
REX.B to determine the addressing mode. Doing so causes it not to read the
offset for rip-relative addressing.
This patch uses the value after masking instead.
Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 4b3fa70..efe7239 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1209,7 +1209,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
}
switch (ctxt->modrm_mod) {
case 0:
- if (ctxt->modrm_rm == 5)
+ if ((ctxt->modrm_rm & 7) == 5)
modrm_ea += insn_fetch(s32, ctxt);
break;
case 1:
--
1.9.1
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