1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * 07/2001 Ported by Wayne Boyer
5 */
6
7 /*\
8 * [Description]
9 *
10 * Verify that, chmod(2) will succeed to change the mode of a file or directory
11 * and set the sticky bit on it if invoked by non-root (uid != 0)
12 * process with the following constraints:
13 *
14 * - the process is the owner of the file or directory.
15 * - the effective group ID or one of the supplementary group ID's of the
16 * process is equal to the group ID of the file or directory.
17 */
18
19 #include <pwd.h>
20 #include "tst_test.h"
21
22 #define FILE_MODE S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
23 #define DIR_MODE S_IRWXU | S_IRWXG | S_IRWXO
24 #define PERMS 01777
25
26 #define TESTFILE "testfile"
27 #define TESTDIR "testdir_3"
28
29 static struct tcase {
30 char *name;
31 char *desc;
32 } tcases[] = {
33 {TESTFILE, "verify permissions of file"},
34 {TESTDIR, "verify permissions of directory"},
35 };
36
verify_chmod(unsigned int n)37 static void verify_chmod(unsigned int n)
38 {
39 struct stat stat_buf;
40 struct tcase *tc = &tcases[n];
41
42 TST_EXP_PASS(chmod(tc->name, PERMS), "chmod(%s, %04o)",
43 tc->name, PERMS);
44
45 if (!TST_PASS)
46 return;
47
48 SAFE_STAT(tc->name, &stat_buf);
49
50 if ((stat_buf.st_mode & PERMS) != PERMS) {
51 tst_res(TFAIL, "stat(%s) mode=%04o",
52 tc->name, stat_buf.st_mode);
53 } else {
54 tst_res(TPASS, "stat(%s) mode=%04o",
55 tc->name, stat_buf.st_mode);
56 }
57 }
58
setup(void)59 static void setup(void)
60 {
61 char nobody_uid[] = "nobody";
62 struct passwd *ltpuser;
63
64 ltpuser = SAFE_GETPWNAM(nobody_uid);
65 SAFE_SETEUID(ltpuser->pw_uid);
66
67 SAFE_TOUCH(TESTFILE, FILE_MODE, NULL);
68 SAFE_MKDIR(TESTDIR, DIR_MODE);
69 }
70
71 static struct tst_test test = {
72 .setup = setup,
73 .tcnt = ARRAY_SIZE(tcases),
74 .test = verify_chmod,
75 .needs_root = 1,
76 .needs_tmpdir = 1,
77 };
78