X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-1.8 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE X-Spam-Check-By: sourceware.org X-Mail-Handler: MailHop Outbound by DynDNS X-Report-Abuse-To: abuse@dyndns.com (see http://www.dyndns.com/services/mailhop/outbound_abuse.html for abuse reporting information) X-MHO-User: U2FsdGVkX1+jXPdFaPOzNXzu++VV0OJW Date: Fri, 24 Feb 2012 15:42:33 -0500 From: Christopher Faylor To: cygwin@cygwin.com Subject: Re: ldd fails when dll has no execute permissions Message-ID: <20120224204233.GC19740@ednor.casa.cgf.cx> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <1330038220.54804.YahooMailNeo@web36708.mail.mud.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1330038220.54804.YahooMailNeo@web36708.mail.mud.yahoo.com> User-Agent: Mutt/1.5.20 (2009-06-14) 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 Thu, Feb 23, 2012 at 03:03:40PM -0800, cppjavaperl wrote: >This was discovered in cygwin-1.7.10-1. > >If you run 'ldd' against an executable, and the executable has >dependent DLLs which do *not* have execute permissions, ldd's output >stops when it reaches the offending dependent DLL, and reports no >further information.? ldd does not give an error message, and the exit >code is zero. > >To test, pick an application with a dependent DLL, then chmod 666 on >that DLL (pick a DLL you can live without temporarily, of course), then >run 'ldd' against the executable. Can't reproduce this (with the latest DLL from the snapshot): bash$ chmod a-w /bin/*.dll bash$ ldd /bin/pwd ntdll.dll => /cygdrive/c/Windows/SysWOW64/ntdll.dll (0x779a0000) kernel32.dll => /cygdrive/c/Windows/syswow64/kernel32.dll (0x75310000) KERNELBASE.dll => /cygdrive/c/Windows/syswow64/KERNELBASE.dll (0x75ae0000) cygwin1.dll => /usr/bin/cygwin1.dll (0x61000000) cygintl-8.dll => /usr/bin/cygintl-8.dll (0x61730000) cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x63c10000) Given how ldd works, it's hard to see why executable permissions should affect it. ldd starts the executable for debugging and tracks .dlls as they are loaded. The executable bit state should have no effect on that. 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