1 /* Copyright (c) International Business Machines Corp., 2001
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
11 * the GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17 /*
18 * Verify that user cannot create a directory inside directory owned by another
19 * user with restrictive permissions and that the errno is set to EACCESS.
20 */
21
22 #include <errno.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <pwd.h>
26 #include <sys/wait.h>
27 #include <unistd.h>
28 #include <stdlib.h>
29 #include "tst_test.h"
30
31 #define TESTDIR "testdir"
32 #define TESTSUBDIR "testdir/testdir"
33
34 static uid_t nobody_uid, bin_uid;
35
verify_mkdir(void)36 static void verify_mkdir(void)
37 {
38 if (mkdir(TESTSUBDIR, 0777) != -1) {
39 tst_res(TFAIL, "mkdir(%s, %#o) succeeded unexpectedly",
40 TESTSUBDIR, 0777);
41 return;
42 }
43
44 if (errno != EACCES) {
45 tst_res(TFAIL | TERRNO, "Expected EACCES got");
46 return;
47 }
48
49 tst_res(TPASS | TERRNO, "mkdir() failed expectedly");
50 }
51
setup(void)52 static void setup(void)
53 {
54 struct passwd *pw;
55 pid_t pid;
56
57 pw = SAFE_GETPWNAM("nobody");
58 nobody_uid = pw->pw_uid;
59 pw = SAFE_GETPWNAM("bin");
60 bin_uid = pw->pw_uid;
61
62 pid = SAFE_FORK();
63 if (pid == 0) {
64 SAFE_SETREUID(nobody_uid, nobody_uid);
65 SAFE_MKDIR(TESTDIR, 0700);
66 exit(0);
67 }
68
69 tst_reap_children();
70
71 SAFE_SETREUID(bin_uid, bin_uid);
72 }
73
74 static struct tst_test test = {
75 .test_all = verify_mkdir,
76 .needs_tmpdir = 1,
77 .needs_root = 1,
78 .setup = setup,
79 .forks_child = 1,
80 };
81