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Date: Tue, 20 Feb 2001 12:07:09 -0500
From: Earnie Boyd <earnie_boyd AT yahoo DOT com>
Reply-To: Earnie Boyd <cygwin AT cygwin DOT com>
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To: Reuben Thomas <rrt1001 AT cam DOT ac DOT uk>
CC: cygwin AT cygwin DOT com
Subject: Re: mingw > 20001111: fstat bug: buffer overflow?
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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.

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