From: Avi Kivity <avi@redhat.com>
Date: Tue, 21 Aug 2012 14:07:05 +0000 (+0300)
Subject: KVM: x86 emulator: Check segment limits in real mode too
X-Git-Tag: v3.7-rc1~113^2~32
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a5625189f6810ef79ced53989c794acfa10d3370;p=profile%2Fivi%2Fkernel-adaptation-intel-automotive.git

KVM: x86 emulator: Check segment limits in real mode too

Segment limits are verified in real mode, not just protected mode.

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 f8b27cd..5b1c701 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -668,8 +668,6 @@ static int __linearize(struct x86_emulate_ctxt *ctxt,
 
 	la = seg_base(ctxt, addr.seg) + addr.ea;
 	switch (ctxt->mode) {
-	case X86EMUL_MODE_REAL:
-		break;
 	case X86EMUL_MODE_PROT64:
 		if (((signed long)la << 16) >> 16 != la)
 			return emulate_gp(ctxt, 0);
@@ -699,7 +697,10 @@ static int __linearize(struct x86_emulate_ctxt *ctxt,
 				goto bad;
 		}
 		cpl = ctxt->ops->cpl(ctxt);
-		rpl = sel & 3;
+		if (ctxt->mode == X86EMUL_MODE_REAL)
+			rpl = 0;
+		else
+			rpl = sel & 3;
 		cpl = max(cpl, rpl);
 		if (!(desc.type & 8)) {
 			/* data segment */