From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfram Schlich Subject: Re: PaX killing conntrackd (strange "execution attempt") Date: Thu, 13 Nov 2008 18:41:38 +0100 Message-ID: <20081113174138.GM26975@bla.fasel.org> References: <20081113100309.GH26975@bla.fasel.org> <20081113132723.GK26975@bla.fasel.org> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=bla.fasel.org; h=date:from :to:cc:subject:message-id:references:mime-version:content-type: in-reply-to; s=mx; bh=J6V9yXsmSbEyMX25fkL9nL8cxYw=; b=cwdaKSvHND 1DtLOFOK0wG7VvCIL+JHBBRliRbFfqHxic4SZuVUq5TsvRpry5OeWj4x7We6Hw4o MMWwdDxCHSs83eMaMNgO0YUiuiFsx1yfX7im+bAqWeCQyOngZna40T5xc0AI0MOx uHUrLxsjnx3SZvFeOayFRkNPrXsIzqASM= Content-Disposition: inline In-Reply-To: <20081113132723.GK26975@bla.fasel.org> Sender: netfilter-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: netfilter@vger.kernel.org Cc: pageexec@freemail.hu * Wolfram Schlich [2008-11-13 14:27]: > Here's the answer from the PaX team, for those who might be interested: > * pageexec@freemail.hu [2008-11-13 14:18]: > > [...] > > this is a null function pointer dereference problem on the surface and you'll have to > > debug it to get more info. i wonder why nothing shows up in the stack dump however, > > maybe there's more corruption here behind the scenes. once you get the coredumps (and > > i hope you have debug info saved away ;) we can get a backtrace and other things. also > > disable randomization in /proc/sys/... so that results are comparable. best would be > > to find a way to directly trigger this crash, then you could have a live gdb session > > instead of coredump analysis. > > I'll take care of these suggestions now and let you know > about any news. I've now recompiled conntrack-tools using these CFLAGS: -march=nocona -O0 -ggdb -DDEBUG Also, the binaries were not stripped anymore: /usr/sbin/conntrackd: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, not stripped (I forgot to mention I'm on a 64bit kernel + userland). I'm now stressing the firewalls with packets. -- Regards, Wolfram Schlich Gentoo Linux * http://dev.gentoo.org/~wschlich/