diff options
| author | Kees Cook <keescook@chromium.org> | 2017-07-12 23:35:22 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-13 01:26:02 +0200 |
| commit | 3d3653f9732c73feb8c4addfc1cbdaa292a399fa (patch) | |
| tree | 325411c382f3be2925f8718591c503d41fea7943 | |
| parent | ipc/msg.c: avoid ipc_rcu_putref for failed ipc_addid() (diff) | |
| download | linux-3d3653f9732c73feb8c4addfc1cbdaa292a399fa.tar.xz linux-3d3653f9732c73feb8c4addfc1cbdaa292a399fa.zip | |
ipc: move atomic_set() to where it is needed
Only after ipc_addid() has succeeded will refcounting be used, so move
initialization into ipc_addid() and remove from open-coded *_alloc()
routines.
Link: http://lkml.kernel.org/r/20170525185107.12869-17-manfred@colorfullife.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | ipc/msg.c | 2 | ||||
| -rw-r--r-- | ipc/sem.c | 1 | ||||
| -rw-r--r-- | ipc/shm.c | 2 | ||||
| -rw-r--r-- | ipc/util.c | 1 |
4 files changed, 1 insertions, 5 deletions
diff --git a/ipc/msg.c b/ipc/msg.c index cd90bfde89a4..770342e1d327 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -117,8 +117,6 @@ static struct msg_queue *msg_alloc(void) if (unlikely(!msq)) return NULL; - atomic_set(&msq->q_perm.refcount, 1); - return msq; } diff --git a/ipc/sem.c b/ipc/sem.c index 2b2ed56e0fde..5f137738819d 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -465,7 +465,6 @@ static struct sem_array *sem_alloc(size_t nsems) return NULL; memset(sma, 0, size); - atomic_set(&sma->sem_perm.refcount, 1); return sma; } diff --git a/ipc/shm.c b/ipc/shm.c index c5976d318ed1..d1988ef821a1 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -526,8 +526,6 @@ static struct shmid_kernel *shm_alloc(void) if (unlikely(!shp)) return NULL; - atomic_set(&shp->shm_perm.refcount, 1); - return shp; } diff --git a/ipc/util.c b/ipc/util.c index 2428dd44ca97..1a2cb02467ab 100644 --- a/ipc/util.c +++ b/ipc/util.c @@ -232,6 +232,7 @@ int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int size) idr_preload(GFP_KERNEL); + atomic_set(&new->refcount, 1); spin_lock_init(&new->lock); new->deleted = false; rcu_read_lock(); |