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Date: Wed, 8 Oct 2014 07:26:25 -0700
From: Michal Zalewski <>
To: oss-security <>
Subject: Re: Re: Thoughts on Shellshock and beyond

> Note that the hardening fix that was provided in a rush
> post-disclosure is not the best one. [...]
> It breaks backward compatibility because it restricts which
> functions can be exported. For instance, you can't export a
> /bin/rm function anymore (was useful as a debugging tool).

Hmm, wasn't that breakage actually caused by the first (original)
patch, which added a call to legal_identifier()? We had problems with
the patch specifically because it managed to break several instances
where people were trying to export "fake object-oriented" function
names such as foo::bar.


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