linux-master/ipc/util.c

174 	struct kern_ipc_perm *ipcp;
176 	ipcp = rhashtable_lookup_fast(&ids->key_ht, &key,
178 	if (!ipcp)
182 	ipc_lock_object(ipcp);
183 	return ipcp;
353  * @ipcp: ipc permission set
363  * It is called with ipc_ids.rwsem and ipcp->lock held.
366 			   struct kern_ipc_perm *ipcp,
372 	if (ipcperms(ns, ipcp, params->flg))
375 		err = ops->associate(ipcp, params->flg);
377 			err = ipcp->id;
400 	struct kern_ipc_perm *ipcp;
409 	ipcp = ipc_findkey(ids, params->key);
410 	if (ipcp == NULL) {
424 				err = ops->more_checks(ipcp, params);
430 				err = ipc_check_perms(ns, ipcp, ops, params);
432 		ipc_unlock(ipcp);
442  * @ipcp: ipc perm structure containing the key to remove
447 static void ipc_kht_remove(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
449 	if (ipcp->key != IPC_PRIVATE)
450 		WARN_ON_ONCE(rhashtable_remove_fast(&ids->key_ht, &ipcp->khtnode,
492  * @ipcp: ipc perm structure containing the identifier to remove
497 void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
499 	int idx = ipcid_to_idx(ipcp->id);
501 	WARN_ON_ONCE(idr_remove(&ids->ipcs_idr, idx) != ipcp);
502 	ipc_kht_remove(ids, ipcp);
504 	ipcp->deleted = true;
517  * @ipcp: ipc perm structure containing the key to modify
522 void ipc_set_key_private(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
524 	ipc_kht_remove(ids, ipcp);
525 	ipcp->key = IPC_PRIVATE;
545  * @ipcp: ipc permission set
553 int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag)
558 	audit_ipc_obj(ipcp);
560 	granted_mode = ipcp->mode;
561 	if (uid_eq(euid, ipcp->cuid) ||
562 	    uid_eq(euid, ipcp->uid))
564 	else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
571 	return security_ipc_permission(ipcp, flag);
728 	struct kern_ipc_perm *ipcp;
730 	ipcp = ipc_obtain_object_check(ids, id);
731 	if (IS_ERR(ipcp)) {
732 		err = PTR_ERR(ipcp);
736 	audit_ipc_obj(ipcp);
742 	if (uid_eq(euid, ipcp->cuid) || uid_eq(euid, ipcp->uid)  ||
744 		return ipcp; /* successful lookup */