linux-master/ipc/namespace.c

28 static struct ucounts *inc_ipc_namespaces(struct user_namespace *ns)
30 	return inc_ucount(ns, current_euid(), UCOUNT_IPC_NAMESPACES);
41 	struct ipc_namespace *ns;
60 	ns = kzalloc(sizeof(struct ipc_namespace), GFP_KERNEL_ACCOUNT);
61 	if (ns == NULL)
64 	err = ns_alloc_inum(&ns->ns);
67 	ns->ns.ops = &ipcns_operations;
69 	refcount_set(&ns->ns.count, 1);
70 	ns->user_ns = get_user_ns(user_ns);
71 	ns->ucounts = ucounts;
73 	err = mq_init_ns(ns);
78 	if (!setup_mq_sysctls(ns))
81 	if (!setup_ipc_sysctls(ns))
84 	err = msg_init_ns(ns);
88 	sem_init_ns(ns);
89 	shm_init_ns(ns);
91 	return ns;
94 	retire_mq_sysctls(ns);
97 	put_user_ns(ns->user_ns);
98 	ns_free_inum(&ns->ns);
100 	kfree(ns);
108 	struct user_namespace *user_ns, struct ipc_namespace *ns)
111 		return get_ipc_ns(ns);
112 	return create_ipc_ns(user_ns, ns);
117  * @ns:   the namespace to remove the ipcs from
123 void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
140 		free(ns, perm);
146 static void free_ipc_ns(struct ipc_namespace *ns)
152 	mntput(ns->mq_mnt);
153 	sem_exit_ns(ns);
154 	msg_exit_ns(ns);
155 	shm_exit_ns(ns);
157 	retire_mq_sysctls(ns);
158 	retire_ipc_sysctls(ns);
160 	dec_ipc_namespaces(ns->ucounts);
161 	put_user_ns(ns->user_ns);
162 	ns_free_inum(&ns->ns);
163 	kfree(ns);
184  * @ns: the namespace to put
198 void put_ipc_ns(struct ipc_namespace *ns)
200 	if (refcount_dec_and_lock(&ns->ns.count, &mq_lock)) {
201 		mq_clear_sbinfo(ns);
204 		if (llist_add(&ns->mnt_llist, &free_ipc_list))
209 static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns)
211 	return container_of(ns, struct ipc_namespace, ns);
216 	struct ipc_namespace *ns = NULL;
222 		ns = get_ipc_ns(nsproxy->ipc_ns);
225 	return ns ? &ns->ns : NULL;
228 static void ipcns_put(struct ns_common *ns)
230 	return put_ipc_ns(to_ipc_ns(ns));
236 	struct ipc_namespace *ns = to_ipc_ns(new);
237 	if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
242 	nsproxy->ipc_ns = get_ipc_ns(ns);
246 static struct user_namespace *ipcns_owner(struct ns_common *ns)
248 	return to_ipc_ns(ns)->user_ns;