LSM: Update comment on security_sock_rcv_skb

It is not permitted to do sleeping operation inside security_sock_rcv_skb().

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serue@us.ibm.com>
--
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/include/linux/security.h b/include/linux/security.h
index 466cbad..3696ca3 100644 (file)
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -978,6 +978,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *     Check permissions on incoming network packets.  This hook is distinct
  *     from Netfilter's IP input hooks since it is the first time that the
  *     incoming sk_buff @skb has been associated with a particular socket, @sk.
+ *     Must not sleep inside this hook because some callers hold spinlocks.
  *     @sk contains the sock (not socket) associated with the incoming sk_buff.
  *     @skb contains the incoming network data.
  * @socket_getpeersec_stream: