1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * Test Description:
6 * Verify that, fchmod() will succeed to change the mode of a file/directory
7 * set the sticky bit on it if invoked by root (uid = 0) process with
8 * the following constraints,
9 * - the process is not the owner of the file/directory.
10 * - the effective group ID or one of the supplementary group ID's of the
11 * process is equal to the group ID of the file/directory.
12 *
13 * Expected Result:
14 * fchmod() should return value 0 on success and succeeds to set sticky bit
15 * on the specified file.
16 */
17
18 #include <pwd.h>
19 #include <grp.h>
20 #include <errno.h>
21
22 #include "tst_test.h"
23 #include "fchmod.h"
24
25 static int fd;
26
verify_fchmod(void)27 static void verify_fchmod(void)
28 {
29 struct stat stat_buf;
30 mode_t file_mode;
31
32 TEST(fchmod(fd, PERMS));
33 if (TST_RET == -1)
34 tst_res(TFAIL | TTERRNO, "fchmod() failed unexpectly");
35
36 SAFE_FSTAT(fd, &stat_buf);
37 file_mode = stat_buf.st_mode;
38
39 if ((file_mode & ~S_IFREG) != PERMS) {
40 tst_res(TFAIL, "%s: Incorrect modes 0%03o, Expected 0%03o",
41 TESTFILE, file_mode, PERMS);
42 } else {
43 tst_res(TPASS, "Functionality of fchmod(%d, %#o) Successful",
44 fd, PERMS);
45 }
46 }
47
setup(void)48 static void setup(void)
49 {
50 struct passwd *ltpuser;
51 struct group *ltpgroup;
52
53 ltpuser = SAFE_GETPWNAM("nobody");
54 ltpgroup = SAFE_GETGRNAM_FALLBACK("users", "daemon");
55
56 fd = SAFE_OPEN(TESTFILE, O_RDWR | O_CREAT, FILE_MODE);
57 SAFE_CHOWN(TESTFILE, ltpuser->pw_uid, ltpgroup->gr_gid);
58 SAFE_SETGID(ltpgroup->gr_gid);
59 }
60
cleanup(void)61 static void cleanup(void)
62 {
63 if (fd > 0)
64 SAFE_CLOSE(fd);
65 }
66
67 static struct tst_test test = {
68 .test_all = verify_fchmod,
69 .needs_root = 1,
70 .setup = setup,
71 .cleanup = cleanup,
72 .needs_tmpdir = 1,
73 };
74