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Re: /proc filesystem allows bypassing directory permissions on Linux
From: psz () maths usyd edu au
Date: Tue, 27 Oct 2009 11:05:46 +1100

Tony Finch <dot () dotat at> wrote:

Attacker opens [directory] and waits. ...
Attacker uses openat() to open and modify the "private" file.

Surely if the permissions do not allow lookup then openat() will fail.
[The attacker opened directory when it was searcheable; then permissions
were closed; then attacker attempts openat().] Surely directory contents
are not cached??!!

Cheers, Paul

Paul Szabo   psz () maths usyd edu au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia


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