From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752169AbZEJMTy (ORCPT ); Sun, 10 May 2009 08:19:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751831AbZEJMTp (ORCPT ); Sun, 10 May 2009 08:19:45 -0400 Received: from casper.infradead.org ([85.118.1.10]:40092 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751097AbZEJMTo (ORCPT ); Sun, 10 May 2009 08:19:44 -0400 Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen From: Peter Zijlstra To: Wu Fengguang Cc: KOSAKI Motohiro , Alan Cox , Andrew Morton , "hannes@cmpxchg.org" , "riel@redhat.com" , "linux-kernel@vger.kernel.org" , "tytso@mit.edu" , "linux-mm@kvack.org" , "elladan@eskimo.com" , "npiggin@suse.de" , "cl@linux-foundation.org" , "minchan.kim@gmail.com" In-Reply-To: <20090510114454.GA8891@localhost> References: <20090508081608.GA25117@localhost> <20090508125859.210a2a25.akpm@linux-foundation.org> <20090508230045.5346bd32@lxorguk.ukuu.org.uk> <2f11576a0905100159m32c36a9ep9fb7cc5604c60b2@mail.gmail.com> <20090510092053.GA7651@localhost> <2f11576a0905100229m2c5e6a67md555191dc8c374ae@mail.gmail.com> <20090510100335.GC7651@localhost> <2f11576a0905100315j2c810e96mc29b84647dc565c2@mail.gmail.com> <20090510112149.GA8633@localhost> <2f11576a0905100439u38c8bccak355ec23953950d6@mail.gmail.com> <20090510114454.GA8891@localhost> Content-Type: text/plain Date: Sun, 10 May 2009 14:19:08 +0200 Message-Id: <1241957948.9562.2.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2009-05-10 at 19:44 +0800, Wu Fengguang wrote: > > > They always use mmap(PROT_READ | PROT_WRITE | PROT_EXEC) for anycase. > > Please google it. you can find various example. > > How widely is PROT_EXEC abused? Would you share some of your google results? That's a security bug right there and should be fixed regardless of our heuristics. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id A4C6E6B009C for ; Sun, 10 May 2009 08:19:03 -0400 (EDT) Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class citizen From: Peter Zijlstra In-Reply-To: <20090510114454.GA8891@localhost> References: <20090508081608.GA25117@localhost> <20090508125859.210a2a25.akpm@linux-foundation.org> <20090508230045.5346bd32@lxorguk.ukuu.org.uk> <2f11576a0905100159m32c36a9ep9fb7cc5604c60b2@mail.gmail.com> <20090510092053.GA7651@localhost> <2f11576a0905100229m2c5e6a67md555191dc8c374ae@mail.gmail.com> <20090510100335.GC7651@localhost> <2f11576a0905100315j2c810e96mc29b84647dc565c2@mail.gmail.com> <20090510112149.GA8633@localhost> <2f11576a0905100439u38c8bccak355ec23953950d6@mail.gmail.com> <20090510114454.GA8891@localhost> Content-Type: text/plain Date: Sun, 10 May 2009 14:19:08 +0200 Message-Id: <1241957948.9562.2.camel@laptop> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Wu Fengguang Cc: KOSAKI Motohiro , Alan Cox , Andrew Morton , "hannes@cmpxchg.org" , "riel@redhat.com" , "linux-kernel@vger.kernel.org" , "tytso@mit.edu" , "linux-mm@kvack.org" , "elladan@eskimo.com" , "npiggin@suse.de" , "cl@linux-foundation.org" , "minchan.kim@gmail.com" List-ID: On Sun, 2009-05-10 at 19:44 +0800, Wu Fengguang wrote: > > > They always use mmap(PROT_READ | PROT_WRITE | PROT_EXEC) for anycase. > > Please google it. you can find various example. > > How widely is PROT_EXEC abused? Would you share some of your google results? That's a security bug right there and should be fixed regardless of our heuristics. -- 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