[Python-Dev] For sandboxing: alternative to crippling file()

Armin Rigo arigo at tunes.org
Fri Jun 30 19:52:05 CEST 2006

Hi Brett,

On Thu, Jun 29, 2006 at 11:48:36AM -0700, Brett Cannon wrote:
> 1) Is removing 'file' from the builtins dict in PyInterpreterState (and
> maybe some other things) going to be safe enough to sufficiently hide 'file'
> confidently (short of someone being stupid in their C extension module and
> exposing 'file' directly)?


    >>> object.__subclasses__()
    [..., <type 'file'>]

Maybe this one won't work if __subclasses__ is forbidden, but in general
I think there *will* be a way to find this object.

A bientot,


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