From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752464AbaAQQvz (ORCPT ); Fri, 17 Jan 2014 11:51:55 -0500 Received: from terminus.zytor.com ([198.137.202.10]:57607 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750937AbaAQQvy (ORCPT ); Fri, 17 Jan 2014 11:51:54 -0500 Message-ID: <52D95F93.3030000@zytor.com> Date: Fri, 17 Jan 2014 08:51:31 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Borislav Petkov CC: Ren Qiaowei , Thomas Gleixner , Ingo Molnar , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate bound tables References: <1389518403-7715-1-git-send-email-qiaowei.ren@intel.com> <1389518403-7715-2-git-send-email-qiaowei.ren@intel.com> <20140112092019.GA3664@pd.tnic> <52D35ABB.8070904@intel.com> <20140113103808.GC5388@pd.tnic> <52D95AD4.6060603@zytor.com> <20140117164855.GF8715@pd.tnic> In-Reply-To: <20140117164855.GF8715@pd.tnic> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/17/2014 08:48 AM, Borislav Petkov wrote: > On Fri, Jan 17, 2014 at 08:31:16AM -0800, H. Peter Anvin wrote: >> As long as the exception originates from user space there shouldn't >> be any issue. > > And if it originates from kernel space? > We shouldn't have any BOUND or MPX instructions in kernel space. Panic. -hpa