From ed173ab97b4faeeb2809a81c2fa0e6e4f979d5bb Mon Sep 17 00:00:00 2001 From: Herbert van den Bergh Date: Sun, 15 Jul 2007 23:38:25 -0700 Subject: [PATCH] do not limit locked memory when RLIMIT_MEMLOCK is RLIM_INFINITY Fix 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 Acked-by: Chris Mason Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/mlock.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/mlock.c b/mm/mlock.c index 4d3fea267e0d..7b2656055d6a 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -244,9 +244,12 @@ int user_shm_lock(size_t size, struct user_struct *user) 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; -- 2.39.5