1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * 07/2001 John George
5 * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
6 *
7 * Check the return value, and errno of vhangup(2) when a non-root user calls
8 * vhangup().
9 */
10 #include <unistd.h>
11 #include <errno.h>
12 #include <pwd.h>
13 #include <sys/wait.h>
14
15 #include "tst_test.h"
16 #include "lapi/syscalls.h"
17
18 static uid_t nobody_uid;
19
run(void)20 static void run(void)
21 {
22 pid_t pid;
23 int retval;
24
25 pid = SAFE_FORK();
26 if (pid > 0) {
27 waitpid(pid, NULL, 0);
28 } else {
29 retval = setreuid(nobody_uid, nobody_uid);
30 if (retval < 0)
31 tst_brk(TBROK | TTERRNO, "setreuid failed");
32 TEST(tst_syscall(__NR_vhangup));
33 if (TST_RET != -1)
34 tst_brk(TFAIL, "vhangup() failed to fail");
35 else if (TST_ERR == EPERM)
36 tst_res(TPASS, "Got EPERM as expected.");
37 else
38 tst_res(TFAIL, "expected EPERM got %d", TST_ERR);
39 }
40 }
41
setup(void)42 static void setup(void)
43 {
44 struct passwd *pw;
45
46 pw = SAFE_GETPWNAM("nobody");
47 nobody_uid = pw->pw_uid;
48 }
49
50 static struct tst_test test = {
51 .test_all = run,
52 .setup = setup,
53 .needs_root = 1,
54 .forks_child = 1,
55 };
56