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Andrey Vagin f2f25589e7 ipc: always handle a new value of auto_msgmni 
commit 1195d94e00 upstream.

proc_dointvec_minmax() returns zero if a new value has been set.  So we
don't need to check all charecters have been handled.

Below you can find two examples.  In the new value has not been handled
properly.

$ strace ./a.out
open("/proc/sys/kernel/auto_msgmni", O_WRONLY) = 3
write(3, "0\n\0", 3)                    = 2
close(3)                                = 0
exit_group(0)
$ cat /sys/kernel/debug/tracing/trace

$strace ./a.out
open("/proc/sys/kernel/auto_msgmni", O_WRONLY) = 3
write(3, "0\n", 2)                      = 2
close(3)                                = 0

$ cat /sys/kernel/debug/tracing/trace
a.out-697   [000] ....  3280.998235: unregister_ipcns_notifier <-proc_ipcauto_dointvec_minmax

Fixes: 9eefe520c8 ("ipc: do not use a negative value to re-enable msgmni automatic recomputin")
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Joe Perches <joe@perches.com>
Cc: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-11-21 09:22:54 -08:00
..
compat.c get rid of union semop in sys_semctl(2) arguments 2013-03-05 15:14:16 -05:00
compat_mq.c ipc: initialize structure memory to zero for compat functions 2010-10-27 18:03:13 -07:00
ipc_sysctl.c ipc: always handle a new value of auto_msgmni 2014-11-21 09:22:54 -08:00
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,mqueue: remove limits for the amount of system-wide queues 2014-03-06 21:30:12 -08:00
mqueue.c ipc,mqueue: remove limits for the amount of system-wide queues 2014-03-06 21:30:12 -08:00
msg.c ipc: Fix 2 bugs in msgrcv() MSG_COPY implementation 2014-03-23 21:38:17 -07:00
msgutil.c ipc, msg: fix message length check for negative values 2013-12-04 10:56:10 -08:00
namespace.c ipc: drop ipc_lock_by_ptr 2013-10-18 07:45:48 -07:00
sem.c ipc/sem.c: synchronize semop and semctl with IPC_RMID 2013-12-04 10:56:12 -08:00
shm.c ipc,shm: fix shm_file deletion races 2013-11-29 11:11:41 -08:00
syscall.c get rid of union semop in sys_semctl(2) arguments 2013-03-05 15:14:16 -05:00
util.c ipc: update locking scheme comments 2013-12-04 10:56:12 -08:00
util.h ipc, msg: fix message length check for negative values 2013-12-04 10:56:10 -08:00