280 static int seccomp_check_filter(struct sock_filter *filter, unsigned int flen)  in seccomp_check_filter()  argument
284 		struct sock_filter *ftest = &filter[pc];  in seccomp_check_filter()
412 			READ_ONCE(current->seccomp.filter);  in seccomp_run_filters()
508 		     is_ancestor(thread->seccomp.filter,  in seccomp_can_sync_threads()
509 				 caller->seccomp.filter)))  in seccomp_can_sync_threads()
523 static inline void seccomp_filter_free(struct seccomp_filter *filter)  in seccomp_filter_free()  argument
525 	if (filter) {  in seccomp_filter_free()
526 		bpf_prog_destroy(filter->prog);  in seccomp_filter_free()
527 		kfree(filter);  in seccomp_filter_free()
571 	struct seccomp_filter *orig = tsk->seccomp.filter;  in seccomp_filter_release()
577 	tsk->seccomp.filter = NULL;  in seccomp_filter_release()
613 		__seccomp_filter_release(thread->seccomp.filter);  in seccomp_sync_threads()
616 		smp_store_release(&thread->seccomp.filter,  in seccomp_sync_threads()
617 				  caller->seccomp.filter);  in seccomp_sync_threads()
704 	struct seccomp_filter *filter = ERR_PTR(-EFAULT);  in seccomp_prepare_user_filter()  local
712 		fprog.filter = compat_ptr(fprog32.filter);  in seccomp_prepare_user_filter()
717 	filter = seccomp_prepare_filter(&fprog);  in seccomp_prepare_user_filter()
719 	return filter;  in seccomp_prepare_user_filter()
740 		struct sock_filter *insn = &fprog->filter[pc];  in seccomp_is_const_allow()
877 				  struct seccomp_filter *filter)  in seccomp_attach_filter()  argument
885 	total_insns = filter->prog->len;  in seccomp_attach_filter()
886 	for (walker = current->seccomp.filter; walker; walker = walker->prev)  in seccomp_attach_filter()
906 		filter->log = true;  in seccomp_attach_filter()
910 		filter->wait_killable_recv = true;  in seccomp_attach_filter()
916 	filter->prev = current->seccomp.filter;  in seccomp_attach_filter()
917 	seccomp_cache_prepare(filter);  in seccomp_attach_filter()
918 	current->seccomp.filter = filter;  in seccomp_attach_filter()
928 static void __get_seccomp_filter(struct seccomp_filter *filter)  in __get_seccomp_filter()  argument
930 	refcount_inc(&filter->refs);  in __get_seccomp_filter()
936 	struct seccomp_filter *orig = tsk->seccomp.filter;  in get_seccomp_filter()
1055 static u64 seccomp_next_notify_id(struct seccomp_filter *filter)  in seccomp_next_notify_id()  argument
1061 	lockdep_assert_held(&filter->notify_lock);  in seccomp_next_notify_id()
1062 	return filter->notif->next_id++;  in seccomp_next_notify_id()
1401 static void seccomp_notify_free(struct seccomp_filter *filter)  in seccomp_notify_free()  argument
1403 	kfree(filter->notif);  in seccomp_notify_free()
1404 	filter->notif = NULL;  in seccomp_notify_free()
1407 static void seccomp_notify_detach(struct seccomp_filter *filter)  in seccomp_notify_detach()  argument
1411 	if (!filter)  in seccomp_notify_detach()
1414 	mutex_lock(&filter->notify_lock);  in seccomp_notify_detach()
1420 	list_for_each_entry(knotif, &filter->notif->notifications, list) {  in seccomp_notify_detach()
1436 	seccomp_notify_free(filter);  in seccomp_notify_detach()
1437 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_detach()
1442 	struct seccomp_filter *filter = file->private_data;  in seccomp_notify_release()  local
1444 	seccomp_notify_detach(filter);  in seccomp_notify_release()
1445 	__put_seccomp_filter(filter);  in seccomp_notify_release()
1451 find_notification(struct seccomp_filter *filter, u64 id)  in find_notification()  argument
1455 	lockdep_assert_held(&filter->notify_lock);  in find_notification()
1457 	list_for_each_entry(cur, &filter->notif->notifications, list) {  in find_notification()
1474 static int recv_wait_event(struct seccomp_filter *filter)  in recv_wait_event()  argument
1479 	if (atomic_dec_if_positive(&filter->notif->requests) >= 0)  in recv_wait_event()
1483 		ret = prepare_to_wait_event(&filter->wqh, &wait, TASK_INTERRUPTIBLE);  in recv_wait_event()
1485 		if (atomic_dec_if_positive(&filter->notif->requests) >= 0)  in recv_wait_event()
1493 	finish_wait(&filter->wqh, &wait);  in recv_wait_event()
1497 static long seccomp_notify_recv(struct seccomp_filter *filter,  in seccomp_notify_recv()  argument
1513 	ret = recv_wait_event(filter);  in seccomp_notify_recv()
1517 	mutex_lock(&filter->notify_lock);  in seccomp_notify_recv()
1518 	list_for_each_entry(cur, &filter->notif->notifications, list) {  in seccomp_notify_recv()
1540 	wake_up_poll(&filter->wqh, EPOLLOUT | EPOLLWRNORM);  in seccomp_notify_recv()
1543 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_recv()
1554 		mutex_lock(&filter->notify_lock);  in seccomp_notify_recv()
1555 		knotif = find_notification(filter, unotif.id);  in seccomp_notify_recv()
1558 			if (should_sleep_killable(filter, knotif))  in seccomp_notify_recv()
1561 			atomic_inc(&filter->notif->requests);  in seccomp_notify_recv()
1562 			wake_up_poll(&filter->wqh, EPOLLIN | EPOLLRDNORM);  in seccomp_notify_recv()
1564 		mutex_unlock(&filter->notify_lock);  in seccomp_notify_recv()
1570 static long seccomp_notify_send(struct seccomp_filter *filter,  in seccomp_notify_send()  argument
1587 	ret = mutex_lock_interruptible(&filter->notify_lock);  in seccomp_notify_send()
1591 	knotif = find_notification(filter, resp.id);  in seccomp_notify_send()
1608 	if (filter->notif->flags & SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP)  in seccomp_notify_send()
1613 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_send()
1617 static long seccomp_notify_id_valid(struct seccomp_filter *filter,  in seccomp_notify_id_valid()  argument
1627 	ret = mutex_lock_interruptible(&filter->notify_lock);  in seccomp_notify_id_valid()
1631 	knotif = find_notification(filter, id);  in seccomp_notify_id_valid()
1637 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_id_valid()
1641 static long seccomp_notify_set_flags(struct seccomp_filter *filter,  in seccomp_notify_set_flags()  argument
1649 	ret = mutex_lock_interruptible(&filter->notify_lock);  in seccomp_notify_set_flags()
1652 	filter->notif->flags = flags;  in seccomp_notify_set_flags()
1653 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_set_flags()
1657 static long seccomp_notify_addfd(struct seccomp_filter *filter,  in seccomp_notify_addfd()  argument
1695 	ret = mutex_lock_interruptible(&filter->notify_lock);  in seccomp_notify_addfd()
1699 	knotif = find_notification(filter, addfd.id);  in seccomp_notify_addfd()
1734 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_addfd()
1750 	mutex_lock(&filter->notify_lock);  in seccomp_notify_addfd()
1764 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_addfd()
1774 	struct seccomp_filter *filter = file->private_data;  in seccomp_notify_ioctl()  local
1780 		return seccomp_notify_recv(filter, buf);  in seccomp_notify_ioctl()
1782 		return seccomp_notify_send(filter, buf);  in seccomp_notify_ioctl()
1785 		return seccomp_notify_id_valid(filter, buf);  in seccomp_notify_ioctl()
1787 		return seccomp_notify_set_flags(filter, arg);  in seccomp_notify_ioctl()
1794 		return seccomp_notify_addfd(filter, buf, _IOC_SIZE(cmd));  in seccomp_notify_ioctl()
1803 	struct seccomp_filter *filter = file->private_data;  in seccomp_notify_poll()  local
1807 	poll_wait(file, &filter->wqh, poll_tab);  in seccomp_notify_poll()
1809 	if (mutex_lock_interruptible(&filter->notify_lock) < 0)  in seccomp_notify_poll()
1812 	list_for_each_entry(cur, &filter->notif->notifications, list) {  in seccomp_notify_poll()
1821 	mutex_unlock(&filter->notify_lock);  in seccomp_notify_poll()
1823 	if (refcount_read(&filter->users) == 0)  in seccomp_notify_poll()
1836 static struct file *init_listener(struct seccomp_filter *filter)  in init_listener()  argument
1841 	filter->notif = kzalloc(sizeof(*(filter->notif)), GFP_KERNEL);  in init_listener()
1842 	if (!filter->notif)  in init_listener()
1845 	filter->notif->next_id = get_random_u64();  in init_listener()
1846 	INIT_LIST_HEAD(&filter->notif->notifications);  in init_listener()
1849 				 filter, O_RDWR);  in init_listener()
1854 	__get_seccomp_filter(filter);  in init_listener()
1858 		seccomp_notify_free(filter);  in init_listener()
1880 	for (cur = current->seccomp.filter; cur; cur = cur->prev) {  in has_duplicate_listener()
1902 				    const char __user *filter)  in seccomp_set_mode_filter()  argument
1935 	prepared = seccomp_prepare_user_filter(filter);  in seccomp_set_mode_filter()
2001 					   const char __user *filter)  in seccomp_set_mode_filter()  argument
2084 long prctl_set_seccomp(unsigned long seccomp_mode, void __user *filter)  in prctl_set_seccomp()  argument
2101 		uargs = filter;  in prctl_set_seccomp()
2115 	struct seccomp_filter *orig, *filter;  in get_nth_filter()  local
2129 	orig = task->seccomp.filter;  in get_nth_filter()
2134 	for (filter = orig; filter; filter = filter->prev)  in get_nth_filter()
2138 		filter = ERR_PTR(-ENOENT);  in get_nth_filter()
2143 	for (filter = orig; filter && count > 1; filter = filter->prev)  in get_nth_filter()
2146 	if (WARN_ON(count != 1 || !filter)) {  in get_nth_filter()
2147 		filter = ERR_PTR(-ENOENT);  in get_nth_filter()
2151 	__get_seccomp_filter(filter);  in get_nth_filter()
2155 	return filter;  in get_nth_filter()
2161 	struct seccomp_filter *filter;  in seccomp_get_filter()  local
2170 	filter = get_nth_filter(task, filter_off);  in seccomp_get_filter()
2171 	if (IS_ERR(filter))  in seccomp_get_filter()
2172 		return PTR_ERR(filter);  in seccomp_get_filter()
2174 	fprog = filter->prog->orig_prog;  in seccomp_get_filter()
2188 	if (copy_to_user(data, fprog->filter, bpf_classic_proglen(fprog)))  in seccomp_get_filter()
2192 	__put_seccomp_filter(filter);  in seccomp_get_filter()
2200 	struct seccomp_filter *filter;  in seccomp_get_metadata()  local
2216 	filter = get_nth_filter(task, kmd.filter_off);  in seccomp_get_metadata()
2217 	if (IS_ERR(filter))  in seccomp_get_metadata()
2218 		return PTR_ERR(filter);  in seccomp_get_metadata()
2220 	if (filter->log)  in seccomp_get_metadata()
2227 	__put_seccomp_filter(filter);  in seccomp_get_metadata()
2492 	f = READ_ONCE(task->seccomp.filter);  in proc_pid_seccomp_cache()