From: Gleb Natapov <gleb@redhat.com>
Date: Thu, 18 Mar 2010 13:20:10 +0000 (+0200)
Subject: KVM: x86 emulator: inject #UD on access to non-existing CR
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6aebfa6ea75f9a02a0339e733090dd40d6f2edfd;p=linux-beck.git

KVM: x86 emulator: inject #UD on access to non-existing CR

Signed-off-by: Gleb Natapov <gleb@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 fa4604e03250..836e97ba45da 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2520,6 +2520,13 @@ twobyte_insn:
 		c->dst.type = OP_NONE;
 		break;
 	case 0x20: /* mov cr, reg */
+		switch (c->modrm_reg) {
+		case 1:
+		case 5 ... 7:
+		case 9 ... 15:
+			kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
+			goto done;
+		}
 		c->regs[c->modrm_rm] = ops->get_cr(c->modrm_reg, ctxt->vcpu);
 		c->dst.type = OP_NONE;	/* no writeback */
 		break;