Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759022AbXIYUvT (ORCPT ); Tue, 25 Sep 2007 16:51:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753729AbXIYUvL (ORCPT ); Tue, 25 Sep 2007 16:51:11 -0400 Received: from hawking.rebel.net.au ([203.20.69.83]:34284 "EHLO hawking.rebel.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753740AbXIYUvK (ORCPT ); Tue, 25 Sep 2007 16:51:10 -0400 Message-ID: <46F974B8.3040705@davidnewall.com> Date: Wed, 26 Sep 2007 06:21:04 +0930 From: David Newall User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2) Gecko/20070221 SeaMonkey/1.1.1 MIME-Version: 1.0 To: Jan Engelhardt CC: "Serge E. Hallyn" , Bill Davidsen , Philipp Marek , 7eggert@gmx.de, Alan Cox , majkls , bunk@fs.tum.de, linux-kernel@vger.kernel.org Subject: Re: Chroot bug References: <56705.193.171.152.61.1190289559.squirrel@webmail.marek.priv.at> <46F29A9A.4070806@davidnewall.com> <200709201817.17282@x5> <46F2B59F.8090709@davidnewall.com> <46F2DDD0.3030500@tmr.com> <46F380E4.4040606@davidnewall.com> <20070924213215.GA32716@vino.hallyn.com> <46F83474.5040503@davidnewall.com> <20070924230008.GA3160@vino.hallyn.com> <46F8BC8A.7080006@davidnewall.com> <20070925114947.GA9721@vino.hallyn.com> <46F91417.9050600@davidnewall.com> <46F924E3.50205@davidnewall.com> <46F92C17.3060405@davidnewall.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 831 Lines: 26 Jan Engelhardt wrote: > On Sep 26 2007 01:11, David Newall wrote: > >> Jan Engelhardt wrote: >> >>> On Sep 26 2007 00:40, David Newall wrote: >>> >>> >>>> Miloslav Semler pointed out that a root process can chdir("..") out of its >>>> chroot. >>>> >>> So what? Just do this: chdir into the root after chroot. >>> >> I don't think so. His exploit just got me all the way out of a chroot within a >> chroot within a chroot, inclusive of lots of chdirs. >> > > Close all fds that point to directories outside the root ;-) > Nope, still gets out. - 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/