[resending, since my previous message had tabs converted to spaces]
This patch fixes a bug in mm/mlock.c on 32-bit architectures that prevents
a user from locking more than 4GB of shared memory, or allocating more
than 4GB of shared memory in hugepages, when rlim[RLIMIT_MEMLOCK] is
set to RLIM_INFINITY.
Signed-off-by: Herbert van den Bergh <[email protected]>
Acked-by: Chris Mason <[email protected]>
--- linux-2.6.22/mm/mlock.c.orig 2007-07-09 10:19:31.000000000 -0700
+++ linux-2.6.22/mm/mlock.c 2007-07-09 10:19:19.000000000 -0700
@@ -244,9 +244,12 @@ int user_shm_lock(size_t size, struct us
locked = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
+ if (lock_limit == RLIM_INFINITY)
+ allowed = 1;
lock_limit >>= PAGE_SHIFT;
spin_lock(&shmlock_user_lock);
- if (locked + user->locked_shm > lock_limit && !capable(CAP_IPC_LOCK))
+ if (!allowed &&
+ locked + user->locked_shm > lock_limit && !capable(CAP_IPC_LOCK))
goto out;
get_uid(user);
user->locked_shm += locked;
-
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