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Davidlohr Bueso 4271b05a22 ipc,msg: prevent race with rmid in msgsnd,msgrcv ... This fixes a race in both msgrcv() and msgsnd() between finding the msg and actually dealing with the queue, as another thread can delete shmid underneath us if we are preempted before acquiring the kern_ipc_perm.lock. Manfred illustrates this nicely: Assume a preemptible kernel that is preempted just after msq = msq_obtain_object_check(ns, msqid) in do_msgrcv(). The only lock that is held is rcu_read_lock(). Now the other thread processes IPC_RMID. When the first task is resumed, then it will happily wait for messages on a deleted queue. Fix this by checking for if the queue has been deleted after taking the lock. Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Reported-by: Manfred Spraul <manfred@colorfullife.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: <stable@vger.kernel.org> [3.11] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		11 years ago
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Makefile	Add generic sys_ipc wrapper	15 years ago
compat.c	get rid of union semop in sys_semctl(2) arguments	12 years ago
compat_mq.c	ipc: initialize structure memory to zero for compat functions	14 years ago
ipc_sysctl.c	ipc: add sysctl to specify desired next object id	12 years ago
ipcns_notifier.c	…
mq_sysctl.c	mqueue: separate mqueue default value from maximum value	13 years ago
mqueue.c	audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record	12 years ago
msg.c	ipc,msg: prevent race with rmid in msgsnd,msgrcv	11 years ago
msgutil.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	12 years ago
namespace.c	ipc: drop ipc_lock_by_ptr	12 years ago
sem.c	ipc/sem.c: update sem_otime for all operations	11 years ago
shm.c	ipc: fix race with LSMs	12 years ago
syscall.c	get rid of union semop in sys_semctl(2) arguments	12 years ago
util.c	ipc: fix race with LSMs	12 years ago
util.h	ipc: fix race with LSMs	12 years ago