Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751634Ab1E2BPH (ORCPT ); Sat, 28 May 2011 21:15:07 -0400 Received: from terminus.zytor.com ([198.137.202.10]:47148 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750804Ab1E2BPE (ORCPT ); Sat, 28 May 2011 21:15:04 -0400 Message-ID: <4DE19DC3.7090106@zytor.com> Date: Sat, 28 May 2011 18:13:39 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10 MIME-Version: 1.0 To: Ingo Molnar CC: Linus Torvalds , Dan Rosenberg , "Rafael J. Wysocki" , Tony Luck , linux-kernel@vger.kernel.org, davej@redhat.com, kees.cook@canonical.com, davem@davemloft.net, eranian@google.com, adobriyan@gmail.com, penberg@kernel.org, Arjan van de Ven , Andrew Morton , Valdis.Kletnieks@vt.edu, pageexec@freemail.hu Subject: Re: [RFC][PATCH] Randomize kernel base address on boot References: <1306269105.21443.20.camel@dan> <201105270018.36835.rjw@sisk.pl> <20110527170045.GB4356@elte.hu> <1306516230.3339.17.camel@dan> <20110527171611.GE4356@elte.hu> <20110527174644.GG4356@elte.hu> <4DDFE52D.4070308@zytor.com> <20110528121820.GB12059@elte.hu> In-Reply-To: <20110528121820.GB12059@elte.hu> 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 Content-Length: 798 Lines: 22 On 05/28/2011 05:18 AM, Ingo Molnar wrote: > > Having half a megabyte of '__init buffer' at the beginning or end of > the kernel image is no big deal, it's more than enough for good > randomization and makes the whole thing image-loader invariant: we > can freely shift the 'real' kernel image within this larger boundary > without consulting RAM maps. > Sure, but you're also blowing any attempt at PMD alignment to kingdom come. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/