linux-kernel - unix socket fd sending questions

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Date:	Tue, 16 Jun 2009 13:00:36 -0700
From:	Kevin Fox <Kevin.Fox@....gov>
To:	linux-kernel@...r.kernel.org
Subject: unix socket fd sending questions

Say you were to open a directory handle in process A and pass it through
a unix socket to process B.

Process A and B are owned by two different users and are running in two
separate mount namespaces.

If you were to readdir in process B on the descriptor would you see
process A's view of the world? I'm guessing probably so.

If you were to walk the tree pointed to by the descriptor, would you see
A's view of the world? I'm guessing not if you use open/readdir, but
what about openat and the like?

Thanks,
Kevin Fox

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