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)
37 static int tid;
38
39 static int fan_report_tid_unsupported;
40
thread_create_file(void * arg LTP_ATTRIBUTE_UNUSED)41 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
52 static unsigned int tcases[] = {
53 FAN_CLASS_NOTIF,
54 FAN_CLASS_NOTIF | FAN_REPORT_TID
55 };
56
test01(unsigned int i)57 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
setup(void)95 static void setup(void)
96 {
97 fan_report_tid_unsupported = fanotify_init_flags_supported_by_kernel(FAN_REPORT_TID);
98 }
99
100 static 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