X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Sat, 6 Jun 2009 10:49:24 +0200 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: ASLR sometimes stops working on Vista with 1.7? [was: Re: Cygwin 1.7 release (was ...)] Message-ID: <20090606084924.GI23519@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <1244131746.30024.1318796263@webmail.messagingengine.com> <4A282063.9030804@users.sourceforge.net> <4A286B99.6020702@users.sourceforge.net> <20090605120936.GD23519@calimero.vinschen.de> <4A293237.2010102@cwilson.fastmail.fm> <20090605163510.GF23519@calimero.vinschen.de> <4A296778.2080507@cwilson.fastmail.fm> <20090605213012.GG23519@calimero.vinschen.de> <4A29B510.3020601@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A29B510.3020601@gmail.com> User-Agent: Mutt/1.5.19 (2009-02-20) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Jun 6 01:15, Dave Korn wrote: > Corinna Vinschen wrote: > > > Not good. I'm puzzled where this allocated 68K region is exactly coming > > from, but it really looks like something which occurs in or near dlopen. > > > > I'm going to debug this further tomorrow. I guess that goes without > > saying, but I'd be glad for any help. > > I'll just suggest that these problems can often be debugged more easily in > windbg than gdb, what with gflags/appverifier heap tracking, !vad, !heap, and > related commands. The gflags FLG_HEAP_ENABLE_TAG_BY_DLL might come in handy here. Right. You might have noticed in my mail that I refer to WinDbg already. It has a couple of invaluable helpers. !vprot is one of my favorites, as well as the many available display formats in the memory window. This morning I woke up and suddenly knew what's going on. It's the size of a structure, which had a size of 320 bytes before. Now it has a size of 65596 bytes since the filename stored in it is now a potentially 32K long wide character string. The structure must be shrinked again. I guess I have a patch by tonight. Stay tuned, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/