From 6aebfa6ea75f9a02a0339e733090dd40d6f2edfd Mon Sep 17 00:00:00 2001 From: Gleb Natapov Date: Thu, 18 Mar 2010 15:20:10 +0200 Subject: [PATCH] KVM: x86 emulator: inject #UD on access to non-existing CR Signed-off-by: Gleb Natapov Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/emulate.c | 7 +++++++ 1 file changed, 7 insertions(+) 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; -- 2.34.1