1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2001
4 *    07/2001 ported by John George
5 * Copyright (C) 2021 SUSE LLC <mdoucha@suse.cz>
6 */
7
8/*\
9 * [Description]
10 *
11 * Verify that the system call utime() successfully sets the modification
12 * and access times of a file to the current time, under the following
13 * constraints:
14 *
15 * - The times argument is NULL.
16 * - The user ID of the process is not "root".
17 * - The file is not owned by the user ID of the process.
18 * - The user ID of the process has write access to the file.
19 */
20
21#include <pwd.h>
22#include <utime.h>
23#include <time.h>
24
25#include "tst_test.h"
26#include "tst_uid.h"
27#include "tst_clocks.h"
28
29#define MNTPOINT	"mntpoint"
30#define TEMP_FILE	MNTPOINT"/tmp_file"
31#define FILE_MODE	0766
32
33static uid_t root_uid, user_uid;
34
35static void setup(void)
36{
37	struct passwd *pw;
38	uid_t test_users[2];
39	int fd;
40
41	root_uid = getuid();
42	pw = SAFE_GETPWNAM("nobody");
43	test_users[0] = pw->pw_uid;
44	tst_get_uids(test_users, 1, 2);
45	user_uid = test_users[1];
46
47	fd = SAFE_CREAT(TEMP_FILE, FILE_MODE);
48	SAFE_CLOSE(fd);
49
50	/* Override umask */
51	SAFE_CHMOD(TEMP_FILE, FILE_MODE);
52	SAFE_CHOWN(TEMP_FILE, pw->pw_uid, pw->pw_gid);
53}
54
55static void run(void)
56{
57	struct utimbuf utbuf;
58	struct stat statbuf;
59	time_t mintime, maxtime;
60
61	utbuf.modtime = time(0) - 5;
62	utbuf.actime = utbuf.modtime + 1;
63	TST_EXP_PASS_SILENT(utime(TEMP_FILE, &utbuf));
64	SAFE_STAT(TEMP_FILE, &statbuf);
65
66	if (statbuf.st_atime != utbuf.actime ||
67		statbuf.st_mtime != utbuf.modtime) {
68		tst_res(TFAIL, "Could not set initial file times");
69		return;
70	}
71
72	SAFE_SETEUID(user_uid);
73	mintime = tst_get_fs_timestamp();
74	TST_EXP_PASS(utime(TEMP_FILE, NULL));
75	maxtime = tst_get_fs_timestamp();
76	SAFE_SETEUID(root_uid);
77	SAFE_STAT(TEMP_FILE, &statbuf);
78
79	if (statbuf.st_atime < mintime || statbuf.st_atime > maxtime)
80		tst_res(TFAIL, "utime() did not set expected atime, "
81			"mintime: %ld, maxtime: %ld, st_atime: %ld",
82			mintime, maxtime, statbuf.st_atime);
83
84	if (statbuf.st_mtime < mintime || statbuf.st_mtime > maxtime)
85		tst_res(TFAIL, "utime() did not set expected mtime, "
86			"mintime: %ld, maxtime: %ld, st_mtime: %ld",
87			mintime, maxtime, statbuf.st_mtime);
88}
89
90static struct tst_test test = {
91	.test_all = run,
92	.setup = setup,
93	.needs_root = 1,
94	.mount_device = 1,
95	.mntpoint = MNTPOINT,
96	.all_filesystems = 1,
97	.skip_filesystems = (const char *const[]) {
98		"vfat",
99		"exfat",
100		NULL
101	}
102};
103