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linux/net/kcm
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Tom Herbert e557124023 kcm: Check if sk_user_data already set in kcm_attach 
This is needed to prevent sk_user_data being overwritten.
The check is done under the callback lock. This should prevent
a socket from being attached twice to a KCM mux. It also prevents
a socket from being attached for other use cases of sk_user_data
as long as the other cases set sk_user_data under the lock.
Followup work is needed to unify all the use cases of sk_user_data
to use the same locking.

Reported-by: syzbot+114b15f2be420a8886c3@syzkaller.appspotmail.com
Fixes: ab7ac4eb98 ("kcm: Kernel Connection Multiplexor module")
Signed-off-by: Tom Herbert <tom@quantonium.net>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
History 2018-01-24 15:54:30 -05:00
..
kcmproc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
kcmsock.c kcm: Check if sk_user_data already set in kcm_attach 2018-01-24 15:54:30 -05:00
Kconfig kcm: Use stream parser 2016-08-17 19:36:23 -04:00
Makefile kcm: Add statistics and proc interfaces 2016-03-09 16:36:14 -05:00