Bugtraq: Re: /proc filesystem allows bypassing directory permissions on

[psz () maths usyd edu au]

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