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Linus Torvalds 7983297d99 Initialize msg/shm IPC objects before doing ipc_addid() 
commit b9a5322779 upstream.

As reported by Dmitry Vyukov, we really shouldn't do ipc_addid() before
having initialized the IPC object state.  Yes, we initialize the IPC
object in a locked state, but with all the lockless RCU lookup work,
that IPC object lock no longer means that the state cannot be seen.

We already did this for the IPC semaphore code (see commit e8577d1f03:
"ipc/sem.c: fully initialize sem_array before making it visible") but we
clearly forgot about msg and shm.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-10-22 14:43:20 -07:00
..
compat.c ipc: resolve shadow warnings 2014-10-14 02:18:23 +02:00
compat_mq.c ipc, kernel: use Linux headers 2014-06-06 16:08:14 -07:00
ipc_sysctl.c ipc/msg: increase MSGMNI, remove scaling 2014-12-13 12:42:52 -08:00
Makefile ipc/msg: increase MSGMNI, remove scaling 2014-12-13 12:42:52 -08:00
mq_sysctl.c ipc: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:16 -07:00
mqueue.c ipc: modify message queue accounting to not take kernel data structures into account 2015-08-16 20:52:22 -07:00
msg.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-10-22 14:43:20 -07:00
msgutil.c copy address of proc_ns_ops into ns_common 2014-12-04 14:34:47 -05:00
namespace.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-12-16 15:53:03 -08:00
sem.c ipc/sem.c: update/correct memory barriers 2015-09-13 09:07:38 -07:00
shm.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-10-22 14:43:20 -07:00
syscall.c get rid of union semop in sys_semctl(2) arguments 2013-03-05 15:14:16 -05:00
util.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-10-22 14:43:20 -07:00
util.h ipc, kernel: clear whitespace 2014-06-06 16:08:14 -07:00