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| author | Herbert van den Bergh <Herbert.van.den.Bergh@oracle.com> | 2007-07-15 23:38:25 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-08-09 14:27:41 -0700 |
| commit | ed173ab97b4faeeb2809a81c2fa0e6e4f979d5bb (patch) | |
| tree | fa2015a9061562d15313f136efb0f368b40c2981 | |
| parent | 88656e13bea01b02f02a1dfcd3ba75a83e708648 (diff) | |
| download | lwn-ed173ab97b4faeeb2809a81c2fa0e6e4f979d5bb.tar.gz lwn-ed173ab97b4faeeb2809a81c2fa0e6e4f979d5bb.zip | |
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | mm/mlock.c | 5 |
1 files changed, 4 insertions, 1 deletions
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; |