diff options
| author | Kees Cook <keescook@chromium.org> | 2017-07-12 14:34:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-12 16:26:01 -0700 |
| commit | f8dbe8d290637ac3f68600e30d092393fe9b40a5 (patch) | |
| tree | 20108014c81821082abd938b2c95f4d6a23655e3 /ipc | |
| parent | 2cd648c110b5570c3280bd645797658cabbe5f5c (diff) | |
| download | lwn-f8dbe8d290637ac3f68600e30d092393fe9b40a5.tar.gz lwn-f8dbe8d290637ac3f68600e30d092393fe9b40a5.zip | |
ipc: drop non-RCU allocation
The only users of ipc_alloc() were ipc_rcu_alloc() and the on-heap
sem_io fall-back memory. Better to just open-code these to make things
easier to read.
[manfred@colorfullife.com: Rediff due to inclusion of memset() into ipc_rcu_alloc()]
Link: http://lkml.kernel.org/r/20170525185107.12869-5-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>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/sem.c | 8 | ||||
| -rw-r--r-- | ipc/util.c | 25 | ||||
| -rw-r--r-- | ipc/util.h | 6 |
3 files changed, 6 insertions, 33 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index bdff6d93d2c7..484ccf83cf85 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -1368,7 +1368,8 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum, } sem_unlock(sma, -1); rcu_read_unlock(); - sem_io = ipc_alloc(sizeof(ushort)*nsems); + sem_io = kvmalloc_array(nsems, sizeof(ushort), + GFP_KERNEL); if (sem_io == NULL) { ipc_rcu_putref(&sma->sem_perm, sem_rcu_free); return -ENOMEM; @@ -1402,7 +1403,8 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum, rcu_read_unlock(); if (nsems > SEMMSL_FAST) { - sem_io = ipc_alloc(sizeof(ushort)*nsems); + sem_io = kvmalloc_array(nsems, sizeof(ushort), + GFP_KERNEL); if (sem_io == NULL) { ipc_rcu_putref(&sma->sem_perm, sem_rcu_free); return -ENOMEM; @@ -1480,7 +1482,7 @@ out_rcu_wakeup: wake_up_q(&wake_q); out_free: if (sem_io != fast_sem_io) - ipc_free(sem_io); + kvfree(sem_io); return err; } diff --git a/ipc/util.c b/ipc/util.c index 5d1ff1035efe..dd73feb1569a 100644 --- a/ipc/util.c +++ b/ipc/util.c @@ -395,29 +395,6 @@ void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp) } /** - * ipc_alloc - allocate ipc space - * @size: size desired - * - * Allocate memory from the appropriate pools and return a pointer to it. - * NULL is returned if the allocation fails - */ -void *ipc_alloc(int size) -{ - return kvmalloc(size, GFP_KERNEL); -} - -/** - * ipc_free - free ipc space - * @ptr: pointer returned by ipc_alloc - * - * Free a block created with ipc_alloc(). - */ -void ipc_free(void *ptr) -{ - kvfree(ptr); -} - -/** * ipc_rcu_alloc - allocate ipc space * @size: size desired * @@ -429,7 +406,7 @@ struct kern_ipc_perm *ipc_rcu_alloc(int size) /* * We prepend the allocation with the rcu struct */ - struct kern_ipc_perm *out = ipc_alloc(size); + struct kern_ipc_perm *out = kvmalloc(size, GFP_KERNEL); if (unlikely(!out)) return NULL; diff --git a/ipc/util.h b/ipc/util.h index 09d0f918c3e2..2578fd9be835 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -107,12 +107,6 @@ void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *); /* must be called with ipcp locked */ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg); -/* for rare, potentially huge allocations. - * both function can sleep - */ -void *ipc_alloc(int size); -void ipc_free(void *ptr); - /* * For allocation that need to be freed by RCU. * Objects are reference counted, they start with reference count 1. |