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From: "konstantin.s.serebryany at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/18043] buffer-overflow (read past the end) in wordexp/parse_dollars/parse_param
Date: Mon, 09 Mar 2015 22:35:00 -0000
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X-Bugzilla-Who: konstantin.s.serebryany at gmail dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=18043

Kostya Serebryany <konstantin.s.serebryany at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #19 from Kostya Serebryany <konstantin.s.serebryany at gmail dot com> ---
Ah, let's continue here if you don't mind. 

#include <wordexp.h>
#include <string.h>
int main() {
  wordexp_t w1, w2;
  wordexp("${Ca=}", &w1, 0);
  wordexp("${Ca=}", &w2, 0);
}


==11533== Invalid read of size 1
==11533==    at 0x4F1DC84: parse_param (wordexp.c:1570)
==11533==    by 0x4F1DC84: parse_dollars (wordexp.c:2102)
==11533==    by 0x4F1FFEB: wordexp (wordexp.c:2348)
==11533==  Address 0x51fb4a3 is 0 bytes after a block of size 3 alloc'd
==11533==    at 0x4C2ABBD: malloc (vg_replace_malloc.c:296)
==11533==    by 0x4E71C59: __add_to_environ (setenv.c:193)
==11533==    by 0x4C321FF: setenv (vg_replace_strmem.c:1844)
==11533==    by 0x4F1F045: parse_param (wordexp.c:1915)
==11533==    by 0x4F1F045: parse_dollars (wordexp.c:2102)
==11533==    by 0x4F1FFEB: wordexp (wordexp.c:2348)

==11533== 
==11533== Invalid read of size 1
==11533==    at 0x4F1DB39: parse_param (wordexp.c:1894)
==11533==    by 0x4F1DB39: parse_dollars (wordexp.c:2102)
==11533==    by 0x4F1FFEB: wordexp (wordexp.c:2348)
==11533==  Address 0x51fb4a3 is 0 bytes after a block of size 3 alloc'd
==11533==    at 0x4C2ABBD: malloc (vg_replace_malloc.c:296)
==11533==    by 0x4E71C59: __add_to_environ (setenv.c:193)
==11533==    by 0x4C321FF: setenv (vg_replace_strmem.c:1844)
==11533==    by 0x4F1F045: parse_param (wordexp.c:1915)
==11533==    by 0x4F1F045: parse_dollars (wordexp.c:2102)
==11533==    by 0x4F1FFEB: wordexp (wordexp.c:2348)

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