From 5ed44a401ddfc60e11c3484e86f0c8285051139a Mon Sep 17 00:00:00 2001 From: Herbert van den Bergh <Herbert.van.den.Bergh@oracle.com> 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 <herbert.van.den.bergh@oracle.com> Acked-by: Chris Mason <chris.mason@oracle.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- mm/mlock.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/mlock.c b/mm/mlock.c index 4d3fea267e0da..7b2656055d6a9 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; -- GitLab