From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261252AbVAHRSQ (ORCPT ); Sat, 8 Jan 2005 12:18:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261220AbVAHRSQ (ORCPT ); Sat, 8 Jan 2005 12:18:16 -0500 Received: from holomorphy.com ([207.189.100.168]:47592 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S261230AbVAHRRt (ORCPT ); Sat, 8 Jan 2005 12:17:49 -0500 Date: Sat, 8 Jan 2005 09:17:11 -0800 From: William Lee Irwin III To: Andrea Arcangeli Cc: Andy Isaacson , Linus Torvalds , "David S. Miller" , linux-kernel@vger.kernel.org, tglx@linutronix.de, akpm@osdl.org Subject: Re: VM fixes [->used_math to PF_USED_MATH] [6/4] Message-ID: <20050108171711.GW9636@holomorphy.com> References: <20041224174156.GE13747@dualathlon.random> <20041224100147.32ad4268.davem@davemloft.net> <20041224182219.GH13747@dualathlon.random> <20041225022721.GR13747@dualathlon.random> <20041225032430.GT13747@dualathlon.random> <20041225145321.GU13747@dualathlon.random> <20041227070309.GA28907@hexapodia.org> <20050102154148.GA5164@dualathlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050102154148.GA5164@dualathlon.random> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 26, 2004 at 11:03:09PM -0800, Andy Isaacson wrote: >> I can't find any authoritative source for that assertion, but google >> supports it: >> http://sources.redhat.com/ml/libc-alpha/2002-09/msg00328.html On Sun, Jan 02, 2005 at 04:41:48PM +0100, Andrea Arcangeli wrote: > This is a nice reference, thanks for the info (I personally only worked > with ev6 so I probably never run in the exact features and history of > the older chips). > All issues with ev4+smp/preempt and ev5+smp/preempt should be fixed with > the two incremental patches I posted last week that make PF_MEMDIE a > TIF_MEMDIE and used_math a PF_USED_MATH and that fixes the PF_MEMDIE > race that existed on all archs in mainline 2.6 and that AFIK Wli even > managed to reproduce once. Reproduced only once ever on x86-64, but reliably reproducible on all other 64-bit architectures. 32-bit architectures have resource scalability issues that make the particular exploit I wrote ineffective. -- wli