Manfred Spraul d694ad62bf ipc/sem.c: fix race with concurrent semtimedop() timeouts and IPC_RMID ...

If a semaphore array is removed and in parallel a sleeping task is woken
up (signal or timeout, does not matter), then the woken up task does not
wait until wake_up_sem_queue_do() is completed.  This will cause crashes,
because wake_up_sem_queue_do() will read from a stale pointer.

The fix is simple: Regardless of anything, always call get_queue_result().
This function waits until wake_up_sem_queue_do() has finished it's task.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=27142

Reported-by: Yuriy Yevtukhov <yuriy@ucoz.com>
Reported-by: Harald Laabs <kernel@dasr.de>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: <stable@kernel.org>		[2.6.35+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2011-07-25 20:57:07 -07:00

..

compat_mq.c

ipc: initialize structure memory to zero for compat functions

2010-10-27 18:03:13 -07:00

compat.c

ipc: initialize structure memory to zero for compat functions

2010-10-27 18:03:13 -07:00

ipc_sysctl.c

sysctl ipc: Remove dead binary sysctl support code.

2009-11-12 02:04:54 -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

sysctl ipc: Remove dead binary sysctl support code.

2009-11-12 02:04:54 -08:00

mqueue.c

fs: icache RCU free inodes

2011-01-07 17:50:26 +11:00

msg.c

Fix common misspellings

2011-03-31 11:26:23 -03:00

msgutil.c

userns: add a user namespace owner of ipc ns

2011-03-23 19:47:07 -07:00

namespace.c

ns proc: Add support for the ipc namespace

2011-05-10 14:35:47 -07:00

sem.c

ipc/sem.c: fix race with concurrent semtimedop() timeouts and IPC_RMID

2011-07-25 20:57:07 -07:00

shm.c

fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers

2011-07-20 20:47:59 -04:00

syscall.c

ppc64 sys_ipc breakage in 2.6.34-rc2

2010-03-22 09:57:19 -07:00

util.c

ipc,rcu: Convert call_rcu(ipc_immediate_free) to kfree_rcu()

2011-07-20 14:10:16 -07:00

util.h

userns: user namespaces: convert several capable() calls

2011-03-23 19:47:08 -07:00