Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754264Ab2JCUow (ORCPT ); Wed, 3 Oct 2012 16:44:52 -0400 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:54063 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753025Ab2JCUov (ORCPT ); Wed, 3 Oct 2012 16:44:51 -0400 Date: Wed, 3 Oct 2012 21:49:29 +0100 From: Alan Cox To: Kees Cook Cc: Nick Bowler , Linus Torvalds , Linux Kernel Mailing List Subject: Re: Linux 3.6 Message-ID: <20121003214929.107b3b48@pyramind.ukuu.org.uk> In-Reply-To: <20121003200515.GZ9092@outflux.net> References: <20121003194614.GA2893@elliptictech.com> <20121003200515.GZ9092@outflux.net> X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.8; x86_64-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 864 Lines: 23 On Wed, 3 Oct 2012 13:05:15 -0700 Kees Cook wrote: > Hi Nick, > > 3.6 introduced link restrictions: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=800179c9b8a1e796e441674776d11cd4c05d61d7 > > It sounds like you've got symlinks in a world-writable directory, and > you're following those symlinks across mis-matched uids. You can either > have the symlinks be owned by the directory owner, or you can turn off > symlink restrictions in sysctl: > > # echo 0 > /proc/sys/fs/protected_symlinks Quite honestly that should be pushed for 3.6.1 as a default - ASAP. Alan -- 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/