Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com X-Apparently-From: Message-ID: <3A92A43D.7361155D@yahoo.com> Date: Tue, 20 Feb 2001 12:07:09 -0500 From: Earnie Boyd Reply-To: Earnie Boyd X-Mailer: Mozilla 4.76 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 To: Reuben Thomas CC: cygwin@cygwin.com Subject: Re: mingw > 20001111: fstat bug: buffer overflow? References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Reuben Thomas wrote: > > In mingw versions later than 20001111, i.e. 20001225 and 20010130, fstat > seems to overrun the stat buffer passed to it. This is illustrated by the > following program, in which if a simple struct stat is passed to test, foo > crashes when it tries to return (presumably the return address is > overwritten). If a struct bar (with extra padding before and after the > struct stat) is used instead, there is no error. > > >From looking at /usr/include/mingw/stat.h, it seems that there are at least > two different versions of struct stat in play, potentially with different > types, but I don't claim to understand what's going on. > Which gcc version are you using? There are different versions of the stat structure based on whether you are using CRTDLL or MSVCRT. There is a bug in the specs file for gcc-2.95.2-7 in that __MSVCRT__ should be defined when -mno-cygwin is used. The absence of this is what has caused your problem. Earnie P.S.: Thanks for the test case. I'll try it out later. _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com -- Want to unsubscribe from this list? Check out: http://cygwin.com/ml/#unsubscribe-simple