This is the mail archive of the
cygwin@sources.redhat.com
mailing list for the Cygwin project.
Re: mingw > 20001111: fstat bug: buffer overflow?
- To: Reuben Thomas <rrt1001 at cam dot ac dot uk>
- Subject: Re: mingw > 20001111: fstat bug: buffer overflow?
- From: Earnie Boyd <earnie_boyd at yahoo dot com>
- Date: Tue, 20 Feb 2001 12:07:09 -0500
- CC: cygwin at cygwin dot com
- References: <Pine.LNX.4.33.0102201240330.1238-100000@localhost.localdomain>
- Reply-To: Earnie Boyd <cygwin at cygwin dot com>
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