Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756439AbXF2W3r (ORCPT ); Fri, 29 Jun 2007 18:29:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753129AbXF2W3k (ORCPT ); Fri, 29 Jun 2007 18:29:40 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:47200 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752688AbXF2W3j (ORCPT ); Fri, 29 Jun 2007 18:29:39 -0400 Subject: Re: how to determine if the noexec stack is defined by an application From: Arjan van de Ven To: Andreas Schwab Cc: linux-kernel@vger.kernel.org In-Reply-To: References: <46856F24.5060407@andrei.myip.org> <1183153758.2894.1.camel@laptopd505.fenrus.org> Content-Type: text/plain Organization: Intel International BV Date: Fri, 29 Jun 2007 15:27:47 -0700 Message-Id: <1183156068.2894.4.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 (2.10.2-3.fc7) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1159 Lines: 30 On Sat, 2007-06-30 at 00:15 +0200, Andreas Schwab wrote: > Arjan van de Ven writes: > > > like this: > > > > $ eu-readelf -l /bin/true | grep STACK > > GNU_STACK 0x000000 0x00000000 0x00000000 0x000000 0x000000 RW 0x4 > > > > > > (replace /bin/true with the binary or library you want to check) > > > > if it says "RW" like here, it'll have non-executable stack. If it says > > "RWX" or if this line is absent entirely, the stack will be executable. > > The last part is not true. Some architectures (especially newer ones) > default to non-exec stack. The absense of a GNU_STACK header represents > the default. ok you're right; powerpc64 defaults to non-executable stack (all others default to executable stack) -- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org - 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/