1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
4 * Author: Yang Xu <[email protected]>
5 */
6
7 /*\
8 * [Description]
9 *
10 * Before kernel 2.6.26 we could not trace init(1) process and ptrace() would
11 * fail with EPERM. This case just checks whether we can trace init(1) process
12 * successfully.
13 */
14
15 #include <errno.h>
16 #include <signal.h>
17 #include <sys/wait.h>
18 #include <pwd.h>
19 #include <stdlib.h>
20 #include <sys/ptrace.h>
21 #include "tst_test.h"
22
verify_ptrace(void)23 static void verify_ptrace(void)
24 {
25 TEST(ptrace(PTRACE_ATTACH, 1, NULL, NULL));
26 if (TST_RET == 0)
27 tst_res(TPASS, "ptrace() traces init process successfully");
28 else
29 tst_res(TFAIL | TTERRNO,
30 "ptrace() returns %ld, failed unexpectedly", TST_RET);
31
32 /*
33 * Wait until tracee is stopped by SIGSTOP otherwise detach will fail
34 * with ESRCH.
35 */
36 SAFE_WAITPID(1, NULL, 0);
37
38 SAFE_PTRACE(PTRACE_DETACH, 1, NULL, NULL);
39 }
40
41 static struct tst_test test = {
42 .test_all = verify_ptrace,
43 .needs_root = 1,
44 };
45