I was just reading the aufs man-page section on security with an NFS 
directory with mode 711. One way to improve security would be to 
generate symlink filenames containing a lot of random characters. Then, 
write a bogus symlink where the symlink target is actually the 
random-character tag. It would only take one extra readlink() to get the 
tag value required to look up the actual link.

Joe Krahn

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