From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761630AbXERXIz (ORCPT ); Fri, 18 May 2007 19:08:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755741AbXERXIs (ORCPT ); Fri, 18 May 2007 19:08:48 -0400 Received: from terminus.zytor.com ([192.83.249.54]:55762 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755626AbXERXIr (ORCPT ); Fri, 18 May 2007 19:08:47 -0400 Message-ID: <464E31F8.7010701@zytor.com> Date: Fri, 18 May 2007 16:08:40 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.0 (X11/20070507) MIME-Version: 1.0 To: Philipp Kohlbecher CC: Dave Jones , Arnd Bergmann , linux-kernel@vger.kernel.org, linux-assembly@vger.kernel.org Subject: Re: [PATCH 2.6.21.1] i386: save registers before intra-privilege syscall References: <20070517220638.GA6532@localhost.localdomain> <464CD44A.5000307@zytor.com> <464CE4CA.8000704@uni-greifswald.de> <464CE653.4020006@zytor.com> <464D64B2.6050104@uni-greifswald.de> <464E2B97.9040205@zytor.com> In-Reply-To: <464E2B97.9040205@zytor.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org H. Peter Anvin wrote: > Sticking kernel mode values in those fields would add no value, except > as a poison (since %ss == KERNEL_DS and would cause a #GP(0) if it ever > reached IRET.) #SS(0), rather, of course. -hpa