1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2018 Huawei.  All Rights Reserved.
4 *
5 * Started by nixiaoming <nixiaoming@huawei.com>
6 */
7
8/*\
9 * [Description]
10 * After fanotify_init adds flags FAN_REPORT_TID,
11 * check whether the program can accurately identify which thread id
12 * in the multithreaded program triggered the event.
13 */
14
15#define _GNU_SOURCE
16#include "config.h"
17
18#include <stdio.h>
19#include <stdlib.h>
20
21#include <sys/stat.h>
22#include <sys/types.h>
23#include <errno.h>
24#include <string.h>
25#include <unistd.h>
26#include <sys/syscall.h>
27#include <pthread.h>
28#include <sys/stat.h>
29#include <linux/limits.h>
30#include "tst_test.h"
31#include "tst_safe_pthread.h"
32
33#ifdef HAVE_SYS_FANOTIFY_H
34#include "fanotify.h"
35
36#define gettid() syscall(SYS_gettid)
37static int tid;
38
39static int fan_report_tid_unsupported;
40
41static void *thread_create_file(void *arg LTP_ATTRIBUTE_UNUSED)
42{
43	char tid_file[64] = {0};
44
45	tid = gettid();
46	snprintf(tid_file, sizeof(tid_file), "test_tid_%d",  tid);
47	SAFE_FILE_PRINTF(tid_file, "1");
48
49	pthread_exit(0);
50}
51
52static unsigned int tcases[] = {
53	FAN_CLASS_NOTIF,
54	FAN_CLASS_NOTIF | FAN_REPORT_TID
55};
56
57static void test01(unsigned int i)
58{
59	pthread_t p_id;
60	struct fanotify_event_metadata event;
61	int fd_notify;
62	int tgid = getpid();
63
64	tst_res(TINFO, "Test #%u: %s FAN_REPORT_TID: tgid=%d, tid=%d, event.pid=%d",
65			i, (tcases[i] & FAN_REPORT_TID) ? "with" : "without",
66			tgid, tid, event.pid);
67
68	if (fan_report_tid_unsupported && (tcases[i] & FAN_REPORT_TID)) {
69		FANOTIFY_INIT_FLAGS_ERR_MSG(FAN_REPORT_TID, fan_report_tid_unsupported);
70		return;
71	}
72
73	fd_notify = SAFE_FANOTIFY_INIT(tcases[i], 0);
74
75	SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_ADD,
76			FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD, AT_FDCWD, ".");
77
78	SAFE_PTHREAD_CREATE(&p_id, NULL, thread_create_file, NULL);
79
80	SAFE_READ(0, fd_notify, &event, sizeof(struct fanotify_event_metadata));
81
82	if ((tcases[i] & FAN_REPORT_TID) && event.pid == tid)
83		tst_res(TPASS, "event.pid == tid");
84	else if (!(tcases[i] & FAN_REPORT_TID) && event.pid == tgid)
85		tst_res(TPASS, "event.pid == tgid");
86	else
87		tst_res(TFAIL, "unexpected event.pid value");
88
89	if (event.fd != FAN_NOFD)
90		SAFE_CLOSE(event.fd);
91	SAFE_CLOSE(fd_notify);
92	SAFE_PTHREAD_JOIN(p_id, NULL);
93}
94
95static void setup(void)
96{
97	fan_report_tid_unsupported = fanotify_init_flags_supported_by_kernel(FAN_REPORT_TID);
98}
99
100static struct tst_test test = {
101	.setup = setup,
102	.test = test01,
103	.tcnt =  ARRAY_SIZE(tcases),
104	.needs_tmpdir = 1,
105	.needs_root = 1,
106};
107
108#else
109	TST_TEST_TCONF("system doesn't have required fanotify support");
110#endif
111