tree 17b6084b29434a968f787e238548a843126e2ec3
parent 93d74463d018ddf05c169ad399e62e90e0f82fc0
author Ahmed S. Darwish <darwish.07@gmail.com> 1205436754 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1205439103 -0700

smackfs: do not trust `count' in inodes write()s

Smackfs write() implementation does not put a higher bound on the number of
bytes to copy from user-space.  This may lead to a DOS attack if a malicious
`count' field is given.

Assure that given `count' is exactly the length needed for a /smack/load rule.
 In case of /smack/cipso where the length is relative, assure that `count'
does not exceed the size needed for a buffer representing maximum possible
number of CIPSO 2.2 categories.

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>