NoBigReal emulation should consider the effective address is between 0 and
0xffff instead of checking the logical address. Currently there are no
instructions which are marked with NoBigReal flag, so this bug currently has no
impact.
Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 13a1c76..4b687ff 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -645,8 +645,8 @@ static int __linearize(struct x86_emulate_ctxt *ctxt,
lim = desc_limit_scaled(&desc);
if ((ctxt->mode == X86EMUL_MODE_REAL) && !fetch &&
(ctxt->d & NoBigReal)) {
- /* la is between zero and 0xffff */
- if (la > 0xffff || (u32)(la + size - 1) > 0xffff)
+ /* ea is between zero and 0xffff */
+ if ((u32)addr.ea + size - 1 > 0xfffful)
goto bad;
} else if ((desc.type & 8) || !(desc.type & 4)) {
/* expand-up segment */
--
1.9.1
--
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