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authorManfred Spraul <manfred@colorfullife.com>2013-09-03 16:00:08 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-03 10:42:56 -0700
commitbebcb928c820d0ee83aca4b192adc195e43e66a2 (patch)
tree28ad45577c7e65e28938eed04b0459674a11f0e3 /arch/cris
parentec1882a9391c55332ebf3d1654f40b76e4a6c010 (diff)
ipc/msg.c: Fix lost wakeup in msgsnd().
The check if the queue is full and adding current to the wait queue of pending msgsnd() operations (ss_add()) must be atomic. Otherwise: - the thread that performs msgsnd() finds a full queue and decides to sleep. - the thread that performs msgrcv() first reads all messages from the queue and then sleeps, because the queue is empty. - the msgrcv() calls do not perform any wakeups, because the msgsnd() task has not yet called ss_add(). - then the msgsnd()-thread first calls ss_add() and then sleeps. Net result: msgsnd() and msgrcv() both sleep forever. Observed with msgctl08 from ltp with a preemptible kernel. Fix: Call ipc_lock_object() before performing the check. The patch also moves security_msg_queue_msgsnd() under ipc_lock_object: - msgctl(IPC_SET) explicitely mentions that it tries to expunge any pending operations that are not allowed anymore with the new permissions. If security_msg_queue_msgsnd() is called without locks, then there might be races. - it makes the patch much simpler. Reported-and-tested-by: Vineet Gupta <Vineet.Gupta1@synopsys.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: stable@vger.kernel.org # for 3.11 Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/cris')
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