1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6 /*\
7 * [Description]
8 *
9 * Verify that, fchmod(2) will succeed to change the mode of a file
10 * and set the sticky bit on it if invoked by non-root (uid != 0)
11 * process with the following constraints,
12 * - the process is the owner of the file.
13 * - the effective group ID or one of the supplementary group ID's of the
14 * process is equal to the group ID of the file.
15 */
16
17 #include <pwd.h>
18 #include "fchmod.h"
19 #include "tst_test.h"
20
21 static int fd;
22 static const char nobody_uid[] = "nobody";
23 static struct passwd *ltpuser;
24
verify_fchmod(void)25 static void verify_fchmod(void)
26 {
27 struct stat stat_buf;
28 mode_t file_mode;
29
30 TST_EXP_PASS_SILENT(fchmod(fd, PERMS));
31
32 if (fstat(fd, &stat_buf) == -1)
33 tst_brk(TFAIL | TERRNO, "fstat failed");
34 file_mode = stat_buf.st_mode;
35
36 if ((file_mode & PERMS) != PERMS)
37 tst_res(TFAIL, "%s: Incorrect modes 0%3o, "
38 "Expected 0777", TESTFILE, file_mode);
39 else
40 tst_res(TPASS, "Functionality of fchmod(%d, "
41 "%#o) successful", fd, PERMS);
42 }
43
setup(void)44 static void setup(void)
45 {
46 ltpuser = SAFE_GETPWNAM(nobody_uid);
47
48 SAFE_SETEUID(ltpuser->pw_uid);
49
50 fd = SAFE_OPEN(TESTFILE, O_RDWR | O_CREAT, FILE_MODE);
51 }
52
cleanup(void)53 static void cleanup(void)
54 {
55 if (fd > 0)
56 SAFE_CLOSE(fd);
57 }
58
59 static struct tst_test test = {
60 .test_all = verify_fchmod,
61 .setup = setup,
62 .cleanup = cleanup,
63 .needs_tmpdir = 1,
64 .needs_root = 1,
65 };
66