X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-1.5 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,RCVD_IN_HOSTKARMA_YE,TW_BJ,TW_JC,TW_YG X-Spam-Check-By: sourceware.org X-Mail-Handler: Dyn Standard SMTP by Dyn X-Report-Abuse-To: abuse AT dyndns DOT com (see http://www.dyndns.com/services/sendlabs/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX1+P1U87J1ddFihe/rfLUOem Date: Fri, 18 Jan 2013 10:44:18 -0500 From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com> To: cygwin AT cygwin DOT com Subject: Re: Binutils objcopy bug (was Re: rebase segfault) Message-ID: <20130118154418.GB23471@ednor.casa.cgf.cx> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <50F516C8 DOT 9050602 AT gmail DOT com> <20130115100745 DOT GC2353 AT calimero DOT vinschen DOT de> <50F5312A DOT 2040503 AT gmail DOT com> <20130115112406 DOT GA13752 AT calimero DOT vinschen DOT de> <50F5D246 DOT 6010902 AT gmail DOT com> <50F653AB DOT 80102 AT gmail DOT com> <20130116123509 DOT GA16991 AT calimero DOT vinschen DOT de> <50F96B81 DOT 8090106 AT gmail DOT com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50F96B81.8090106@gmail.com> User-Agent: Mutt/1.5.20 (2009-06-14) Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm Precedence: bulk List-Id: <cygwin.cygwin.com> List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com> List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com> List-Archive: <http://sourceware.org/ml/cygwin/> List-Post: <mailto:cygwin AT cygwin DOT com> List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs> Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com On Fri, Jan 18, 2013 at 04:34:25PM +0100, marco atzeri wrote: >On 1/16/2013 1:35 PM, Corinna Vinschen wrote: >> >> As far as I can tell it's an objcopy bug. >> >> The stripped version of the DLL has a normal relocation information >> which at one point ends in a NULL IMAGE_BASE_RELOCATION record, as >> expected. After calling `objcopy --add-gnu-debuglink', the relocation >> information is supposed to be the same as before, since the relocatable >> file content didn't change. >> >> Nevertheless, when stepping through the relocator code in rebase, it >> turns out that the former NULL IMAGE_BASE_RELOCATION record does not >> contain only 0 values anymore. Rather, it has been overwritten with >> some random(?) non-0 values, which rebase correctly interprets as the >> start of the next IMAGE_BASE_RELOCATION array. So rebase blunders >> along, thus either just SEGVing, if everything goes well, or, worst >> case, overwriting formerly correct information in the file with >> arbitrary data. >> >> This is a serious bug in objcopy in the current binutils. Given that >> cygport creates the debug info automatically, we might end up with >> spuriously broken DLLs in the distro. >> >> I checked with objcopy from the older binutils 2.51.53-2, and the >> problem did not show up. I also built the latest binutils release >> 2.23.1 and the problem also doesn't show, so we probably can get away >> with just a black eye by updating binutils to 2.23.1. Chris? >> >> >> Corinna >> > >Chris, >any news ? Nope. cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple