linux-master/kernel/user_namespace.c

33 static struct ucounts *inc_user_namespaces(struct user_namespace *ns, kuid_t uid)
35 	return inc_ucount(ns, uid, UCOUNT_USER_NAMESPACES);
399  *	make_kuid - Map a user-namespace uid pair into a kuid.
400  *	@ns:  User namespace that the uid is in
401  *	@uid: User identifier
403  *	Maps a user-namespace uid pair into a kernel internal kuid,
406  *	When there is no mapping defined for the user-namespace uid
411 kuid_t make_kuid(struct user_namespace *ns, uid_t uid)
413 	/* Map the uid to a global kernel uid */
414 	return KUIDT_INIT(map_id_down(&ns->uid_map, uid));
419  *	from_kuid - Create a uid from a kuid user-namespace pair.
420  *	@targ: The user namespace we want a uid in.
421  *	@kuid: The kernel internal uid to start with.
424  *	return the resulting uid.
432 	/* Map the uid from a global kernel uid */
438  *	from_kuid_munged - Create a uid from a kuid user-namespace pair.
439  *	@targ: The user namespace we want a uid in.
440  *	@kuid: The kernel internal uid to start with.
443  *	return the resulting uid.
448  *	returns a valid uid.  This makes from_kuid_munged appropriate
450  *	system call and failing to provide a valid uid are not an
457 	uid_t uid;
458 	uid = from_kuid(targ, kuid);
460 	if (uid == (uid_t) -1)
461 		uid = overflowuid;
462 	return uid;
538  *	Maps a user-namespace uid pair into a kernel internal kuid,
548 	/* Map the uid to a global kernel uid */
567 	/* Map the uid from a global kernel uid */
870  * verify_root_map() - check the uid 0 mapping
875  * If a process requests mapping parent uid 0 into the new ns, verify that the
1179 			kuid_t uid = make_kuid(ns->parent, id);
1180 			if (uid_eq(uid, cred->euid))