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

[Armin Rigo]

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)?

No.

    >>> 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,

Armin