33 				struct user_namespace *ns, int cap_setid,
37 static struct ucounts *inc_user_namespaces(struct user_namespace *ns, kuid_t uid)  in inc_user_namespaces()  argument
39 	return inc_ucount(ns, uid, UCOUNT_USER_NAMESPACES);  in inc_user_namespaces()
76 	struct user_namespace *ns, *parent_ns = new->user_ns;  in create_user_ns()  local
110 	ns = kmem_cache_zalloc(user_ns_cachep, GFP_KERNEL);  in create_user_ns()
111 	if (!ns)  in create_user_ns()
114 	ret = ns_alloc_inum(&ns->ns);  in create_user_ns()
117 	ns->ns.ops = &userns_operations;  in create_user_ns()
119 	atomic_set(&ns->count, 1);  in create_user_ns()
121 	ns->parent = parent_ns;  in create_user_ns()
122 	ns->level = parent_ns->level + 1;  in create_user_ns()
123 	ns->owner = owner;  in create_user_ns()
124 	ns->group = group;  in create_user_ns()
125 	INIT_WORK(&ns->work, free_user_ns);  in create_user_ns()
127 		ns->ucount_max[i] = INT_MAX;  in create_user_ns()
129 	ns->ucounts = ucounts;  in create_user_ns()
133 	ns->flags = parent_ns->flags;  in create_user_ns()
137 	init_rwsem(&ns->persistent_keyring_register_sem);  in create_user_ns()
140 	if (!setup_userns_sysctls(ns))  in create_user_ns()
143 	set_cred_user_ns(new, ns);  in create_user_ns()
147 	key_put(ns->persistent_keyring_register);  in create_user_ns()
149 	ns_free_inum(&ns->ns);  in create_user_ns()
151 	kmem_cache_free(user_ns_cachep, ns);  in create_user_ns()
180 	struct user_namespace *parent, *ns =  in free_user_ns()  local
184 		struct ucounts *ucounts = ns->ucounts;  in free_user_ns()
185 		parent = ns->parent;  in free_user_ns()
186 		if (ns->gid_map.nr_extents > UID_GID_MAP_MAX_BASE_EXTENTS) {  in free_user_ns()
187 			kfree(ns->gid_map.forward);  in free_user_ns()
188 			kfree(ns->gid_map.reverse);  in free_user_ns()
190 		if (ns->uid_map.nr_extents > UID_GID_MAP_MAX_BASE_EXTENTS) {  in free_user_ns()
191 			kfree(ns->uid_map.forward);  in free_user_ns()
192 			kfree(ns->uid_map.reverse);  in free_user_ns()
194 		if (ns->projid_map.nr_extents > UID_GID_MAP_MAX_BASE_EXTENTS) {  in free_user_ns()
195 			kfree(ns->projid_map.forward);  in free_user_ns()
196 			kfree(ns->projid_map.reverse);  in free_user_ns()
198 		retire_userns_sysctls(ns);  in free_user_ns()
200 		key_put(ns->persistent_keyring_register);  in free_user_ns()
202 		ns_free_inum(&ns->ns);  in free_user_ns()
203 		kmem_cache_free(user_ns_cachep, ns);  in free_user_ns()
205 		ns = parent;  in free_user_ns()
209 void __put_user_ns(struct user_namespace *ns)  in __put_user_ns()  argument
211 	schedule_work(&ns->work);  in __put_user_ns()
392 kuid_t make_kuid(struct user_namespace *ns, uid_t uid)  in make_kuid()  argument
395 	return KUIDT_INIT(map_id_down(&ns->uid_map, uid));  in make_kuid()
460 kgid_t make_kgid(struct user_namespace *ns, gid_t gid)  in make_kgid()  argument
463 	return KGIDT_INIT(map_id_down(&ns->gid_map, gid));  in make_kgid()
527 kprojid_t make_kprojid(struct user_namespace *ns, projid_t projid)  in make_kprojid()  argument
530 	return KPROJIDT_INIT(map_id_down(&ns->projid_map, projid));  in make_kprojid()
585 	struct user_namespace *ns = seq->private;  in uid_m_show()  local
591 	if ((lower_ns == ns) && lower_ns->parent)  in uid_m_show()
606 	struct user_namespace *ns = seq->private;  in gid_m_show()  local
612 	if ((lower_ns == ns) && lower_ns->parent)  in gid_m_show()
627 	struct user_namespace *ns = seq->private;  in projid_m_show()  local
633 	if ((lower_ns == ns) && lower_ns->parent)  in projid_m_show()
664 	struct user_namespace *ns = seq->private;  in uid_m_start()  local
666 	return m_start(seq, ppos, &ns->uid_map);  in uid_m_start()
671 	struct user_namespace *ns = seq->private;  in gid_m_start()  local
673 	return m_start(seq, ppos, &ns->gid_map);  in gid_m_start()
678 	struct user_namespace *ns = seq->private;  in projid_m_start()  local
680 	return m_start(seq, ppos, &ns->projid_map);  in projid_m_start()
857 	struct user_namespace *ns = seq->private;  in map_write()  local
904 	if (cap_valid(cap_setid) && !file_ns_capable(file, ns, CAP_SYS_ADMIN))  in map_write()
974 	if (!new_idmap_permitted(file, ns, cap_setid, &new_map))  in map_write()
1038 	struct user_namespace *ns = seq->private;  in proc_uid_map_write()  local
1041 	if (!ns->parent)  in proc_uid_map_write()
1044 	if ((seq_ns != ns) && (seq_ns != ns->parent))  in proc_uid_map_write()
1048 			 &ns->uid_map, &ns->parent->uid_map);  in proc_uid_map_write()
1055 	struct user_namespace *ns = seq->private;  in proc_gid_map_write()  local
1058 	if (!ns->parent)  in proc_gid_map_write()
1061 	if ((seq_ns != ns) && (seq_ns != ns->parent))  in proc_gid_map_write()
1065 			 &ns->gid_map, &ns->parent->gid_map);  in proc_gid_map_write()
1072 	struct user_namespace *ns = seq->private;  in proc_projid_map_write()  local
1075 	if (!ns->parent)  in proc_projid_map_write()
1078 	if ((seq_ns != ns) && (seq_ns != ns->parent))  in proc_projid_map_write()
1083 			 &ns->projid_map, &ns->parent->projid_map);  in proc_projid_map_write()
1087 				struct user_namespace *ns, int cap_setid,  in new_idmap_permitted()  argument
1095 	    uid_eq(ns->owner, cred->euid)) {  in new_idmap_permitted()
1098 			kuid_t uid = make_kuid(ns->parent, id);  in new_idmap_permitted()
1102 			kgid_t gid = make_kgid(ns->parent, id);  in new_idmap_permitted()
1103 			if (!(ns->flags & USERNS_SETGROUPS_ALLOWED) &&  in new_idmap_permitted()
1117 	if (ns_capable(ns->parent, cap_setid) &&  in new_idmap_permitted()
1118 	    file_ns_capable(file, ns->parent, cap_setid))  in new_idmap_permitted()
1126 	struct user_namespace *ns = seq->private;  in proc_setgroups_show()  local
1127 	unsigned long userns_flags = READ_ONCE(ns->flags);  in proc_setgroups_show()
1139 	struct user_namespace *ns = seq->private;  in proc_setgroups_write()  local
1180 		if (!(ns->flags & USERNS_SETGROUPS_ALLOWED))  in proc_setgroups_write()
1186 		if (ns->gid_map.nr_extents != 0)  in proc_setgroups_write()
1188 		ns->flags &= ~USERNS_SETGROUPS_ALLOWED;  in proc_setgroups_write()
1202 bool userns_may_setgroups(const struct user_namespace *ns)  in userns_may_setgroups()  argument
1210 	allowed = ns->gid_map.nr_extents != 0;  in userns_may_setgroups()
1212 	allowed = allowed && (ns->flags & USERNS_SETGROUPS_ALLOWED);  in userns_may_setgroups()
1225 	const struct user_namespace *ns;  in in_userns()  local
1226 	for (ns = child; ns->level > ancestor->level; ns = ns->parent)  in in_userns()
1228 	return (ns == ancestor);  in in_userns()
1237 static inline struct user_namespace *to_user_ns(struct ns_common *ns)  in to_user_ns()  argument
1239 	return container_of(ns, struct user_namespace, ns);  in to_user_ns()
1250 	return user_ns ? &user_ns->ns : NULL;  in userns_get()
1253 static void userns_put(struct ns_common *ns)  in userns_put()  argument
1255 	put_user_ns(to_user_ns(ns));  in userns_put()
1258 static int userns_install(struct nsproxy *nsproxy, struct ns_common *ns)  in userns_install()  argument
1260 	struct user_namespace *user_ns = to_user_ns(ns);  in userns_install()
1289 struct ns_common *ns_get_owner(struct ns_common *ns)  in ns_get_owner()  argument
1295 	owner = p = ns->ops->owner(ns);  in ns_get_owner()
1304 	return &get_user_ns(owner)->ns;  in ns_get_owner()
1307 static struct user_namespace *userns_owner(struct ns_common *ns)  in userns_owner()  argument
1309 	return to_user_ns(ns)->parent;  in userns_owner()