IPC: consolidate all xxxctl_down() functions

[linux-2.6.git] / ipc / msg.c

diff --git a/ipc/msg.c b/ipc/msg.c
index 87d8b3852300dcd7273b4b0c84e18fc7a1aafc6a..4a858f98a760156f37bf65a9c6f46ec50fa3c2fd 100644 (file)
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -141,21 +141,6 @@ void __init msg_init(void)
                                IPC_MSG_IDS, sysvipc_msg_proc_show);
 }
 
-/*
- * This routine is called in the paths where the rw_mutex is held to protect
- * access to the idr tree.
- */
-static inline struct msg_queue *msg_lock_check_down(struct ipc_namespace *ns,
-                                               int id)
-{
-       struct kern_ipc_perm *ipcp = ipc_lock_check_down(&msg_ids(ns), id);
-
-       if (IS_ERR(ipcp))
-               return (struct msg_queue *)ipcp;
-
-       return container_of(ipcp, struct msg_queue, q_perm);
-}
-
 /*
  * msg_lock_(check_) routines are called in the paths where the rw_mutex
  * is not held.
@@ -437,35 +422,12 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
                        return -EFAULT;
        }
 
-       down_write(&msg_ids(ns).rw_mutex);
-       msq = msg_lock_check_down(ns, msqid);
-       if (IS_ERR(msq)) {
-               err = PTR_ERR(msq);
-               goto out_up;
-       }
-
-       ipcp = &msq->q_perm;
-
-       err = audit_ipc_obj(ipcp);
-       if (err)
-               goto out_unlock;
-
-       if (cmd == IPC_SET) {
-               err = audit_ipc_set_perm(msqid64.msg_qbytes,
-                                        msqid64.msg_perm.uid,
-                                        msqid64.msg_perm.gid,
-                                        msqid64.msg_perm.mode);
-               if (err)
-                       goto out_unlock;
-       }
+       ipcp = ipcctl_pre_down(&msg_ids(ns), msqid, cmd,
+                              &msqid64.msg_perm, msqid64.msg_qbytes);
+       if (IS_ERR(ipcp))
+               return PTR_ERR(ipcp);
 
-       if (current->euid != ipcp->cuid &&
-           current->euid != ipcp->uid &&
-           !capable(CAP_SYS_ADMIN)) {
-               /* We _could_ check for CAP_CHOWN above, but we don't */
-               err = -EPERM;
-               goto out_unlock;
-       }
+       msq = container_of(ipcp, struct msg_queue, q_perm);
 
        err = security_msg_queue_msgctl(msq, cmd);
        if (err)