Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759332AbXIYPsz (ORCPT ); Tue, 25 Sep 2007 11:48:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755663AbXIYPsr (ORCPT ); Tue, 25 Sep 2007 11:48:47 -0400 Received: from sovereign.computergmbh.de ([85.214.69.204]:36051 "EHLO sovereign.computergmbh.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755405AbXIYPsq (ORCPT ); Tue, 25 Sep 2007 11:48:46 -0400 Date: Tue, 25 Sep 2007 17:48:45 +0200 (CEST) From: Jan Engelhardt To: David Newall 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 In-Reply-To: <46F92C17.3060405@davidnewall.com> Message-ID: 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> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 717 Lines: 19 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 ;-) - 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/