[Python-Dev] pysandbox 1.5 released

Tue Mar 20 16:57:48 CET 2012

Well, I really hope that the PEP regarding frozendict will be accepted.
Especially due to the fact that the required changes are small.
With the recent projects like clojure-py, blog posts like 
http://goo.gl/bFB5x (Python becomes a platform), your pysandbox,
it became clear that people start evaluating Python on a different
level. And for developing custom languages, deeply experimenting
with coroutines and who knows what else, frozendict is a missing 
concept in python's immutable types structure.
On 2012年03月20日, at 8:32 AM, Victor Stinner wrote:
> pysandbox is a Python sandbox. By default, untrusted code executed in
> the sandbox cannot modify the environment (write a file, use print or
> import a module). But you can configure the sandbox to choose exactly
> which features are allowed or not, e.g. import sys module and read
> /etc/issue file.
>> http://pypi.python.org/pypi/pysandbox
> https://github.com/haypo/pysandbox/
>> Main changes since pysandbox 1.0.3:
>> - More modules and functions are allowed: math, random and time
> modules, and the compile() builtin function for example
> - Drop the timeout feature: it was not effective on CPU intensive
> functions implemented in C
> - (Read the ChangeLog to see all changes.)
>> pysandbox has known limitations:
>> - it is unable to limit memory or CPU
> - it does not protect against bugs (e.g. crash) or vulnerabilities in CPython
> - dict methods able to modify a dict (e.g. dict.update) are disabled
> to protect the sandbox namespace, but dict[key]=value is still
> accepted
>> It is recommanded to run untrusted code in a subprocess to workaround
> these limitations. pysandbox doesn't provide an helper yet.
>> pysandbox is used by an IRC bot (fschfsch) to evaluate a Python
> expression. The bot uses fork() and setrlimit() to limit memory and to
> implement a timeout.
>> https://github.com/haypo/pysandbox/wiki/fschfsch
>> --
>> The limitation on dict methods is required to deny the modification of
> the __builtins__ dictionary. I proposed the PEP 416 (frozendict) but
> Guido van Rossum is going to reject it. I don't see how to fix this
> limitation without modifying CPython.
>> http://www.python.org/dev/peps/pep-0416/
>> Victor
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