From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755200Ab2BSUej (ORCPT ); Sun, 19 Feb 2012 15:34:39 -0500 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:19780 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755157Ab2BSUei (ORCPT ); Sun, 19 Feb 2012 15:34:38 -0500 X-Authority-Analysis: v=2.0 cv=fNy7LOme c=1 sm=0 a=ZycB6UtQUfgMyuk2+PxD7w==:17 a=v34b3tIZfGoA:10 a=5SG0PmZfjMsA:10 a=IkcTkHD0fZMA:10 a=pGLkceISAAAA:8 a=9bAiR_rXrmpoHhnyc8gA:9 a=QEXdDO2ut3YA:10 a=MSl-tDqOz04A:10 a=ZycB6UtQUfgMyuk2+PxD7w==:117 X-Cloudmark-Score: 0 X-Originating-IP: 74.67.80.29 Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI From: Steven Rostedt To: "hpanvin@gmail.com" Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Andrew Morton , Peter Zijlstra In-Reply-To: <0e44abc3-f1a9-4c5b-88a8-baa563f57067@email.android.com> References: <1329617173.1561.5.camel@acer.local.home> <20120219125601.GD25900@elte.hu> <0e44abc3-f1a9-4c5b-88a8-baa563f57067@email.android.com> Content-Type: text/plain; charset="UTF-8" Date: Sun, 19 Feb 2012 15:34:39 -0500 Message-ID: <1329683679.1561.20.camel@acer.local.home> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2012-02-19 at 05:46 -0800, hpanvin@gmail.com wrote: > Vsyscall page, not vdso... > Peter, My original patch was to check the %cs register against __KERNEL_CS, but IIRC, you said that userspace can change that register to anything it wanted before doing a long jump or something. Is this true for x86_64 as well? I guess it would be because x86_64 can support 32bit apps. Anyway, I'll add a check that makes sure that the RIP is less than the FIXADDR sections as well. -- Steve