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linux/ipc
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Manfred Spraul 35cfc2b3a9 ipc/sem.c: fully initialize sem_array before making it visible 
commit e8577d1f03 upstream.

ipc_addid() makes a new ipc identifier visible to everyone.  New objects
start as locked, so that the caller can complete the initialization
after the call.  Within struct sem_array, at least sma->sem_base and
sma->sem_nsems are accessed without any locks, therefore this approach
doesn't work.

Thus: Move the ipc_addid() to the end of the initialization.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Reported-by: Rik van Riel <riel@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
History 2015-10-28 10:33:14 +00:00
..
compat.c ipc, kernel: use Linux headers 2014-06-06 16:08:14 -07:00
compat_mq.c ipc, kernel: use Linux headers 2014-06-06 16:08:14 -07:00
ipc_sysctl.c ipc: always handle a new value of auto_msgmni 2014-11-27 11:22:09 +00:00
ipcns_notifier.c ipc: do not use a negative value to re-enable msgmni automatic recomputing 2008-07-25 10:53:42 -07:00
Makefile Add generic sys_ipc wrapper 2010-03-12 15:52:32 -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 2015-08-27 12:08:15 +01:00
msg.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-10-28 10:33:06 +00:00
msgutil.c ipc, msg: fix message length check for negative values 2013-11-13 12:09:36 +09:00
namespace.c ipc: drop ipc_lock_by_ptr 2013-09-11 15:59:44 -07:00
sem.c ipc/sem.c: fully initialize sem_array before making it visible 2015-10-28 10:33:14 +00:00
shm.c Initialize msg/shm IPC objects before doing ipc_addid() 2015-10-28 10:33:06 +00:00
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() 2015-10-28 10:33:06 +00:00
util.h ipc, kernel: clear whitespace 2014-06-06 16:08:14 -07:00