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Date: Fri, 21 Oct 2011 15:29:41 +0530
From: Huzaifa Sidhpurwala <>
CC: Solar Designer <>
Subject: Re: hardlink(1) has buffer overflows, is unsafe on
 changing trees

On 10/20/2011 08:27 PM, Josh Bressers wrote:

>> The hardlink(1) program from Fedora is susceptible to buffer overflows of
>> fixed-size nambuf1 and nambuf2 buffers when run on a tree with deeply
>> nested directories and/or with long directory or file names.  I was able
>> to reproduce the problem (got a segfault) by running the program on a
>> directory containing 20 nested directories with 250-character names.
> CVE-2011-3630 hardlink buffer overflows

FORTIFY_SOURCE should really be able to catch this buffer overflow.
The buffer being overflown here in in BSS, But strcat() is used to 
append to this buffer and __builtin___strcat_chk catches it, resulting 
in the program being terminated.

Nice one though!

Huzaifa Sidhpurwala / Red Hat Security Response Team

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