From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 7BF266B004D for ; Wed, 3 Jun 2009 12:24:05 -0400 (EDT) Received: by pxi37 with SMTP id 37so118466pxi.12 for ; Wed, 03 Jun 2009 09:24:04 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <20090530192829.GK6535@oblivion.subreption.com> <20090531022158.GA9033@oblivion.subreption.com> <20090602203405.GC6701@oblivion.subreption.com> <20090603171409.5c60422c@lxorguk.ukuu.org.uk> Date: Wed, 3 Jun 2009 12:24:03 -0400 Message-ID: <7e0fb38c0906030924q73ffb387h2d20df7f8c2e75ba@mail.gmail.com> Subject: Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space) From: Eric Paris Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Linus Torvalds Cc: Alan Cox , Christoph Lameter , "Larry H." , linux-mm@kvack.org, Rik van Riel , linux-kernel@vger.kernel.org, pageexec@freemail.hu List-ID: On Wed, Jun 3, 2009 at 12:19 PM, Linus Torvalds wrote: > > > On Wed, 3 Jun 2009, Alan Cox wrote: >> >> Fedora at least uses SELinux to manage it. You need some kind of security >> policy engine running as a few apps really need to map low space (mostly >> for vm86) > > Well, vm86 isn't even an issue on x86-64, so it's arguable that at least a > few cases could very easily just make it more static and obvious. Wine does/did also use a zero page, can't remember what they used it for off hand but they were mad at me when I added this.... -Eric -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org