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ipc: use rlimit helpers

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Make sure compiler won't do weird things with limits.  E.g.  fetching them
twice may return 2 different values after writable limits are implemented.

I.e.  either use rlimit helpers added in
3e10e716abf3c71bdb5d86b8f507f9e72236c9cd ("resource: add helpers for
fetching rlimits") or ACCESS_ONCE if not applicable.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Slaby 2010-03-10 15:23:05 -08:00 committed by Linus Torvalds
parent d6db2ade10
commit f1eb1332b8
2 changed files with 2 additions and 3 deletions
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2
ipc/mqueue.c
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@ -155,7 +155,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
spin_lock(&mq_lock);
if (u->mq_bytes + mq_bytes < u->mq_bytes ||
u->mq_bytes + mq_bytes >
p->signal->rlim[RLIMIT_MSGQUEUE].rlim_cur) {
task_rlimit(p, RLIMIT_MSGQUEUE)) {
spin_unlock(&mq_lock);
kfree(info->messages);
goto out_inode;

3
ipc/shm.c
View File

@ -764,8 +764,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
if (euid != shp->shm_perm.uid &&
euid != shp->shm_perm.cuid)
goto out_unlock;
if (cmd == SHM_LOCK &&
!current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)
if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
goto out_unlock;
}