From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935204Ab0CMAZ4 (ORCPT ); Fri, 12 Mar 2010 19:25:56 -0500 Received: from kroah.org ([198.145.64.141]:32885 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935063Ab0CMAVK (ORCPT ); Fri, 12 Mar 2010 19:21:10 -0500 X-Mailbox-Line: From gregkh@kvm.kroah.org Fri Mar 12 16:15:15 2010 Message-Id: <20100313001515.372453718@kvm.kroah.org> User-Agent: quilt/0.48-4.4 Date: Fri, 12 Mar 2010 16:13:35 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Gleb Natapov , Avi Kivity Subject: [patch 117/123] KVM: x86 emulator: Forbid modifying CS segment register by mov instruction In-Reply-To: <20100313001618.GA9811@kroah.com> In-Reply-To: <20100313001618.GA9811@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.33-stable review patch. If anyone has any objections, please let me know. ----------------- From: Gleb Natapov commit 8b9f44140bc4afd2698413cd9960c3912168ee91 upstream. Inject #UD if guest attempts to do so. This is in accordance to Intel SDM. Signed-off-by: Gleb Natapov Signed-off-by: Avi Kivity Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/emulate.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1987,6 +1987,12 @@ special_insn: int err; sel = c->src.val; + + if (c->modrm_reg == VCPU_SREG_CS) { + kvm_queue_exception(ctxt->vcpu, UD_VECTOR); + goto done; + } + if (c->modrm_reg == VCPU_SREG_SS) toggle_interruptibility(ctxt, X86_SHADOW_INT_MOV_SS);