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Re: /proc filesystem allows bypassing directory permissions on Linux

From: psz maths usyd edu au
To: dan lightwave net ru
Cc: bugtraq securityfocus com, pavel ucw cz
Subject: Re: /proc filesystem allows bypassing directory permissions on Linux
Date: Mon - Oct 26, 2009 03:05 AM


Dear Dan,

> ... in authentic kernels /proc/<PID>/fd/<FD> are symlinks ...

They appear to /bin/ls as symlinks, but observation suggests that they
"act" as hardlinks. Could that be fixed somehow? (I did look at the
kernel fs/proc/base.c but did not make much sense to me...)

BTW: did you notice how bugtraq failed to follow this conversation?
They seem to have a strong pro-Windows, contra-Linux stance.

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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