How to get path of a .py script

[Bernhard Herzog]

"David Necas (Yeti)" <yeti at physics.muni.cz> writes:

> After I posted it, I realized this is a strong argument
> against using sys.path[0] for anything, because it allows
> a nasty symlink attack.

How? If using sys.path[0] for anything is a security problem, all python
scripts have it because Python looks in sys.path for modules.

> I can make it contain anything I want (I
> need write permissions in the directory which will appear
> there) by deliberately symlinking the script.

You'd still have to get someone to execute that symlink. If you can do
that you could just as well supply a real script doing whatever you
want. That's a well known security risk on Unix-like systems and the
reason one shouldn't have . in $PATH.

   Bernhard

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