[ python-Bugs-872769 ] os.access() documentation should stress race conditions

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Bugs item #872769, was opened at 2004-01-08 01:40
Message generated for change (Settings changed) made by gbrandl
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Category: Documentation
Group: None
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: seth arnold (setharnold)
>Assigned to: Georg Brandl (gbrandl)
Summary: os.access() documentation should stress race conditions

Initial Comment:
Every version of the documentation I've seen associated
with the os.access() function neglects to mention that
its use is almost always a security vulnerability.

For the versions of python that are still maintained,
I'd like to see the documentation for this function
expanded to include a paragraph very similar to the
warning given in my system's access(2) manpage:

Using access to check if a user is authorized to e.g.,
open a file before actually doing so using open(2)
creates a security hole, because the user might exploit
the short time interval between checking and opening
the file to manipulate it.

(This paragraph comes from a Debian system; if it is
more work to validate the license on this manpage for
including this paragraph here, I'd be happy to write
some new content under whatever license is required to
get a warning included.)

Of course, there are web-based documents derived from
the module's built-in documentation. It'd be keen if
whoever fixes this in the module could poke the website
document maintainer and ask them to regenerate the content.

Thanks!

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Comment By: Georg Brandl (birkenfeld)
Date: 2005-07-17 21:10

Message:
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Thanks for the suggestion. Committed as Doc/lib/libos.tex
r1.163, r1.146.2.9.

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