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Date: Wed, 4 Nov 2009 10:17:13 +1100 From: psz@...hs.usyd.edu.au To: gombasg@...aki.hu, mrex@....com Cc: bugtraq@...urityfocus.com, dan@...htwave.net.ru, jim@...n.com, marco@....nl, pavel@....cz Subject: Re: /proc filesystem allows bypassing directory permissions on >>> "mount --bind" behaves like a hard link and it does not increment the link >>> count. > > # touch /tmp/a > # mount --bind /etc/passwd /tmp/a > # ls -l /etc/passwd > -rw-r--r-- 1 root root 1990 2009-08-24 16:22 /etc/passwd > ... > Two references to the same inode, yet the link count is 1 and /proc is > nowhere in the picture. But, mount requires root (and root can do anything, including shooting himself in the foot). Cheers, Paul Paul Szabo psz@...hs.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia
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