kernel/time/namespace.c

59 static struct ucounts *inc_time_namespaces(struct user_namespace *ns)
61 	return inc_ucount(ns, current_euid(), UCOUNT_TIME_NAMESPACES);
81 	struct time_namespace *ns;
91 	ns = kmalloc(sizeof(*ns), GFP_KERNEL_ACCOUNT);
92 	if (!ns)
95 	refcount_set(&ns->ns.count, 1);
97 	ns->vvar_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
98 	if (!ns->vvar_page)
101 	err = ns_alloc_inum(&ns->ns);
105 	ns->ucounts = ucounts;
106 	ns->ns.ops = &timens_operations;
107 	ns->user_ns = get_user_ns(user_ns);
108 	ns->offsets = old_ns->offsets;
109 	ns->frozen_offsets = false;
110 	return ns;
113 	__free_page(ns->vvar_page);
115 	kfree(ns);
180 				   struct time_namespace *ns)
183 	struct timens_offset monotonic = offset_from_ts(ns->offsets.monotonic);
184 	struct timens_offset boottime = offset_from_ts(ns->offsets.boottime);
220 				struct time_namespace *ns)
225 	if (ns == &init_time_ns)
229 	if (likely(ns->frozen_offsets))
234 	if (ns->frozen_offsets)
237 	ns->frozen_offsets = true;
238 	vdata = arch_get_vdso_data(page_address(ns->vvar_page));
241 		timens_setup_vdso_data(&vdata[i], ns);
247 void free_time_ns(struct time_namespace *ns)
249 	dec_time_namespaces(ns->ucounts);
250 	put_user_ns(ns->user_ns);
251 	ns_free_inum(&ns->ns);
252 	__free_page(ns->vvar_page);
253 	kfree(ns);
256 static struct time_namespace *to_time_ns(struct ns_common *ns)
258 	return container_of(ns, struct time_namespace, ns);
263 	struct time_namespace *ns = NULL;
269 		ns = nsproxy->time_ns;
270 		get_time_ns(ns);
274 	return ns ? &ns->ns : NULL;
279 	struct time_namespace *ns = NULL;
285 		ns = nsproxy->time_ns_for_children;
286 		get_time_ns(ns);
290 	return ns ? &ns->ns : NULL;
293 static void timens_put(struct ns_common *ns)
295 	put_time_ns(to_time_ns(ns));
298 void timens_commit(struct task_struct *tsk, struct time_namespace *ns)
300 	timens_set_vvar_page(tsk, ns);
301 	vdso_join_timens(tsk, ns);
307 	struct time_namespace *ns = to_time_ns(new);
312 	if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
316 	get_time_ns(ns);
318 	nsproxy->time_ns = ns;
320 	get_time_ns(ns);
322 	nsproxy->time_ns_for_children = ns;
328 	struct ns_common *nsc = &nsproxy->time_ns_for_children->ns;
329 	struct time_namespace *ns = to_time_ns(nsc);
335 	get_time_ns(ns);
337 	nsproxy->time_ns = ns;
339 	timens_commit(tsk, ns);
342 static struct user_namespace *timens_owner(struct ns_common *ns)
344 	return to_time_ns(ns)->user_ns;
367 	struct ns_common *ns;
370 	ns = timens_for_children_get(p);
371 	if (!ns)
373 	time_ns = to_time_ns(ns);
383 	struct ns_common *ns;
388 	ns = timens_for_children_get(p);
389 	if (!ns)
391 	time_ns = to_time_ns(ns);
480 	.ns.count	= REFCOUNT_INIT(3),
482 	.ns.inum	= PROC_TIME_INIT_INO,
483 	.ns.ops		= &timens_operations,