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Re: Buffer overflow bug in Bash


From: Andreas Schwab
Subject: Re: Buffer overflow bug in Bash
Date: Fri, 20 Dec 2013 12:33:14 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Ben Okopnik <address@hidden> writes:

> ./borked1: line 6: n/core-default.xml: expression recursion level exceeded
> (error token is "n/core-default.xml")

${foo[n/core-default.xml]} tries to expand n first, which yields
n/core-default.xml, rinse and repeat.

> ./borked2: line 6: on/core-default.xml: division by 0 (error token is
> "-default.xml")

${foo[on/core-default.xml]} tries to expand each non-number, none of
them are defined as variables, so they are replaced by zero, which
yields ${foo[0/0-default.xml]}.

Nothing like a bug in bash, only in your scripts.

Andreas.

-- 
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."



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