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
19static int mount_flag;
20
21static 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
38static 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
50static 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
59static 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