1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
4 * Author: Nirmala Devi Dhanasekar <nirmala.devi@wipro.com>
5 *
6 * Verify that umount(2) returns -1 and sets errno to EPERM if the user
7 * is not the super-user.
8 */
9
10 #include <errno.h>
11 #include <pwd.h>
12 #include <sys/mount.h>
13 #include <sys/types.h>
14 #include <unistd.h>
15 #include "tst_test.h"
16
17 #define MNTPOINT "mntpoint"
18
19 static int mount_flag;
20
verify_umount(void)21 static void verify_umount(void)
22 {
23 TEST(umount(MNTPOINT));
24
25 if (TST_RET != -1) {
26 tst_res(TFAIL, "umount() succeeds unexpectedly");
27 return;
28 }
29
30 if (TST_ERR != EPERM) {
31 tst_res(TFAIL | TTERRNO, "umount() should fail with EPERM");
32 return;
33 }
34
35 tst_res(TPASS | TTERRNO, "umount() fails as expected");
36 }
37
setup(void)38 static void setup(void)
39 {
40 struct passwd *pw;
41
42 SAFE_MKDIR(MNTPOINT, 0775);
43 SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, NULL);
44 mount_flag = 1;
45
46 pw = SAFE_GETPWNAM("nobody");
47 SAFE_SETEUID(pw->pw_uid);
48 }
49
cleanup(void)50 static void cleanup(void)
51 {
52 if (seteuid(0))
53 tst_res(TWARN | TERRNO, "seteuid(0) Failed");
54
55 if (mount_flag)
56 tst_umount(MNTPOINT);
57 }
58
59 static struct tst_test test = {
60 .needs_root = 1,
61 .format_device = 1,
62 .setup = setup,
63 .cleanup = cleanup,
64 .test_all = verify_umount,
65 };
66