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Sat Apr 9 08:43:19 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-April/143845.html

Please don't loose time trying yet another sandbox inside CPython. It's
just a waste of time. It's broken by design.

Please read my email about my attempt (pysandbox):
https://lwn.net/Articles/574323/

And the LWN article:
https://lwn.net/Articles/574215/

There are a lot of safe ways to run CPython inside a sandbox (and not rhe
opposite).

I started as you, add more and more things to a blacklist, but it doesn't
work.

See pysandbox test suite for a lot of ways to escape a sandbox. CPython has
a list of know code to crash CPython (I don't recall the dieectory in
sources), even with the latest version of CPython.

Victor
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[Python-Dev] Challenge: Please break this! (a.k.a restricted mode revisited)