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.
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)