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how to crash bash in two easy ways

From: pbr
Subject: how to crash bash in two easy ways
Date: Mon, 22 Feb 2010 02:30:32 -0800 (PST)
User-agent: G2/1.0

bashbug called sendmail, a link to exim4 which silently ignored the
following (which is a bug in its own right) so I'll post this manually

I found two one-liners which crash bash.

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -
DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' -
DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -
DSHELL -DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/
lib   -g -O2 -Wall
uname output: Linux Rackspace-PBR 2.6.31-19-generic #56-Ubuntu SMP Thu
Jan 28 02:39:34 UTC 2010 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.0
Patch Level: 33
Release Status: release


        I was looking for the simplest way to clear the entire aliases
array and found a crash bug instead.
        I Checked a few other cases and found a second case that
crashes bash as well.

        Bash dies with a segmentation fault anytime I type in either


        Type "B A S H _ A L I A S E S =" (without spaces) and then
enter, at the command line.
        Or, "B A S H _ C M D S =" (without spaces) for a fun variant.

        My fix is sending you guys this 'bashbug' crash report.  Then
re-sending it so it really got to you all.

Feel free to follow up if you have any questions.

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