From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6894 invoked by alias); 7 Jan 2010 11:10:33 -0000 Received: (qmail 6884 invoked by uid 22791); 7 Jan 2010 11:10:32 -0000 X-SWARE-Spam-Status: No, hits=-2.4 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 07 Jan 2010 11:10:21 +0000 Received: from int-mx05.intmail.prod.int.phx2.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.18]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o07B9Wqv031519 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 7 Jan 2010 06:09:32 -0500 Received: from host0.dyn.jankratochvil.net (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx05.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o07B9Tjc027940 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 7 Jan 2010 06:09:31 -0500 Received: from host0.dyn.jankratochvil.net (localhost [127.0.0.1]) by host0.dyn.jankratochvil.net (8.14.3/8.14.3) with ESMTP id o07B9TMM028588; Thu, 7 Jan 2010 12:09:29 +0100 Received: (from jkratoch@localhost) by host0.dyn.jankratochvil.net (8.14.3/8.14.3/Submit) id o07B9S1n028582; Thu, 7 Jan 2010 12:09:28 +0100 Date: Thu, 07 Jan 2010 11:10:00 -0000 From: Jan Kratochvil To: Tristan Gingold Cc: Daniel Jacobowitz , gdb-patches@sourceware.org Subject: Re: Regression on prelinked-sepdebug-shlibs Message-ID: <20100107110927.GA28546@host0.dyn.jankratochvil.net> References: <20091225200440.GA3747@host0.dyn.jankratochvil.net> <20100106180510.GA6748@host0.dyn.jankratochvil.net> <20100106191608.GA28581@caradoc.them.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-08-17) X-IsSubscribed: yes Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2010-01/txt/msg00133.txt.bz2 On Thu, 07 Jan 2010 12:03:04 +0100, Tristan Gingold wrote: ... > I am not sure that you can create a linux native executable with a section whose vma is 0. > But unfortunately linux refuses to execute that (I got a sigkill very very > early) so I can't play with that. https://bugzilla.redhat.com/show_bug.cgi?id=434714 >From Chuck Ebbert: echo "0" >/proc/sys/vm/mmap_min_addr That should fix it -- at least on F8 changing that from 0 to 32768 made it fail. (The executable code starts at 0.) >From Roland McGrath: Yup, I think this is pretty much expected behavior. i.e. an ET_EXEC with a p_vaddr at 0 is asking for a mmap that it is often security policy to refuse. Unfortunately there really isn't much better than SIGKILL death that you can expect for this. Regards, Jan