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 newly added rlimit helpers or ACCESS_ONCE if not applicable. Signed-off-by: Jiri Slaby <[email protected]> Cc: James Morris <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Roland Dreier <[email protected]> Cc: Sean Hefty <[email protected]> Cc: Hal Rosenstock <[email protected]> Cc: [email protected] --- drivers/infiniband/core/umem.c | 2 +- drivers/infiniband/hw/ipath/ipath_user_pages.c | 3 +-- ipc/mqueue.c | 2 +- ipc/shm.c | 3 +-- 4 files changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index 6f7c096..2a8338a 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -136,7 +136,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, down_write(¤t->mm->mmap_sem); locked = npages + current->mm->locked_vm; - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT; + lock_limit = rlim_get_cur(RLIMIT_MEMLOCK) >> PAGE_SHIFT; if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { ret = -ENOMEM; diff --git a/drivers/infiniband/hw/ipath/ipath_user_pages.c b/drivers/infiniband/hw/ipath/ipath_user_pages.c index 82878e3..431ec61 100644 --- a/drivers/infiniband/hw/ipath/ipath_user_pages.c +++ b/drivers/infiniband/hw/ipath/ipath_user_pages.c @@ -59,8 +59,7 @@ static int __get_user_pages(unsigned long start_page, size_t num_pages, size_t got; int ret; - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> - PAGE_SHIFT; + lock_limit = rlim_get_cur(RLIMIT_MEMLOCK) >> PAGE_SHIFT; if (num_pages > lock_limit) { ret = -ENOMEM; diff --git a/ipc/mqueue.c b/ipc/mqueue.c index ee9d697..0e18cde 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -153,7 +153,7 @@ 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_rlim_get_cur(p, RLIMIT_MSGQUEUE)) { spin_unlock(&mq_lock); goto out_inode; } diff --git a/ipc/shm.c b/ipc/shm.c index 464694e..abd1ebd 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -761,8 +761,7 @@ 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 && !rlim_get_cur(RLIMIT_MEMLOCK)) goto out_unlock; } -- 1.6.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
