1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6 /*
7 * Test Name: chmod07
8 *
9 * Test Description:
10 * Verify that, chmod(2) will succeed to change the mode of a file/directory
11 * and sets the sticky bit on it if invoked by root (uid = 0) process with
12 * the following constraints,
13 * - the process is not the owner of the file/directory.
14 * - the effective group ID or one of the supplementary group ID's of the
15 * process is equal to the group ID of the file/directory.
16 *
17 * Expected Result:
18 * chmod() should return value 0 on success and succeeds to set sticky bit
19 * on the specified file.
20 */
21
22 #include <stdio.h>
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <fcntl.h>
26 #include <errno.h>
27 #include <string.h>
28 #include <signal.h>
29 #include <grp.h>
30 #include <pwd.h>
31
32 #include "tst_test.h"
33
34 #define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
35 #define PERMS 01777 /* Permissions with sticky bit set. */
36 #define TESTFILE "testfile"
37
test_chmod(void)38 void test_chmod(void)
39 {
40 struct stat stat_buf;
41
42 /*
43 * Call chmod(2) with specified mode argument
44 * (sticky-bit set) on testfile.
45 */
46 TEST(chmod(TESTFILE, PERMS));
47 if (TST_RET == -1) {
48 tst_brk(TFAIL | TTERRNO, "chmod(%s, %#o) failed",
49 TESTFILE, PERMS);
50 }
51
52 if (stat(TESTFILE, &stat_buf) == -1) {
53 tst_brk(TFAIL | TTERRNO, "stat failed");
54 }
55
56 /* Check for expected mode permissions */
57 if ((stat_buf.st_mode & PERMS) == PERMS) {
58 tst_res(TPASS, "Functionality of chmod(%s, %#o) successful",
59 TESTFILE, PERMS);
60 } else {
61 tst_res(TFAIL, "%s: Incorrect modes 0%03o; expected 0%03o",
62 TESTFILE, stat_buf.st_mode, PERMS);
63 }
64 }
65
setup(void)66 void setup(void)
67 {
68 struct passwd *ltpuser;
69 struct group *ltpgroup;
70 int fd;
71 gid_t group1_gid;
72 uid_t user1_uid;
73
74 ltpuser = SAFE_GETPWNAM("nobody");
75 user1_uid = ltpuser->pw_uid;
76
77 ltpgroup = SAFE_GETGRNAM_FALLBACK("users", "daemon");
78 group1_gid = ltpgroup->gr_gid;
79
80 fd = SAFE_OPEN(TESTFILE, O_RDWR | O_CREAT, FILE_MODE);
81 SAFE_CLOSE(fd);
82 SAFE_CHOWN(TESTFILE, user1_uid, group1_gid);
83 SAFE_SETGID(group1_gid);
84 }
85
86 static struct tst_test test = {
87 .needs_root = 1,
88 .needs_tmpdir = 1,
89 .setup = setup,
90 .test_all = test_chmod,
91 };
92