ipc/mqueue: enforce hard limits

In two places we don't enforce the hard limits for CAP_SYS_RESOURCE apps.
In preparation for making more reasonable hard limits, start enforcing
them even on CAP_SYS_RESOURCE.

Signed-off-by: Doug Ledford <dledford@redhat.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Amerigo Wang <amwang@redhat.com>
Cc: Joe Korty <joe.korty@ccur.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index b103022179a3..6e10a55a78c5 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -301,8 +301,9 @@ static int mqueue_create(struct inode *dir, struct dentry *dentry,
                 error = -EACCES;
                 goto out_unlock;
         }
-        if (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max &&
-                        !capable(CAP_SYS_RESOURCE)) {
+        if (ipc_ns->mq_queues_count >= HARD_QUEUESMAX ||
+            (ipc_ns->mq_queues_count >= ipc_ns->mq_queues_max &&
+             !capable(CAP_SYS_RESOURCE))) {
                 error = -ENOSPC;
                 goto out_unlock;
         }
@@ -589,7 +590,8 @@ static int mq_attr_ok(struct ipc_namespace *ipc_ns, struct mq_attr *attr)
         if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0)
                 return 0;
         if (capable(CAP_SYS_RESOURCE)) {
-                if (attr->mq_maxmsg > HARD_MSGMAX)
+                if (attr->mq_maxmsg > HARD_MSGMAX ||
+                    attr->mq_msgsize > HARD_MSGSIZEMAX)
                         return 0;
         } else {
                 if (attr->mq_maxmsg > ipc_ns->mq_msg_max ||