1 /*
2 * Copyright (C) Bull S.A. 2001
3 * Copyright (c) International Business Machines Corp., 2001
4 * 06/2002 Ported by Jacky Malcles
5 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /*
23 * Verify that, link() fails with -1 and sets errno to EACCES when Write access
24 * to the directory containing newpath is not allowed for the process's
25 * effective uid.
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <fcntl.h>
32 #include <errno.h>
33 #include <string.h>
34 #include <signal.h>
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <pwd.h>
38
39 #include "test.h"
40 #include "safe_macros.h"
41
42 #define NOBODY_USER 99
43 #define MODE_TO S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IXOTH|S_IROTH
44
45 static void setup(void);
46 static void cleanup(void);
47
48 char *TCID = "link06";
49 int TST_TOTAL = 1;
50
51 #define OLDPATH "oldpath"
52 #define NEWPATH "newpath"
53
main(int ac,char ** av)54 int main(int ac, char **av)
55 {
56 int lc;
57
58 tst_parse_opts(ac, av, NULL, NULL);
59
60 setup();
61
62 for (lc = 0; TEST_LOOPING(lc); lc++) {
63 tst_count = 0;
64
65 TEST(link(OLDPATH, NEWPATH));
66
67 if (TEST_RETURN != -1) {
68 tst_resm(TFAIL, "link() returned %ld,"
69 "expected -1, errno=%d", TEST_RETURN,
70 EACCES);
71 } else {
72 if (TEST_ERRNO == EACCES) {
73 tst_resm(TPASS, "link() fails with expected "
74 "error EACCES errno:%d", TEST_ERRNO);
75 } else {
76 tst_resm(TFAIL, "link() fails with "
77 "errno=%d, expected errno=%d",
78 TEST_ERRNO, EACCES);
79 }
80 }
81 }
82
83 cleanup();
84 tst_exit();
85 }
86
setup(void)87 static void setup(void)
88 {
89 struct passwd *nobody_pwd;
90
91 tst_sig(NOFORK, DEF_HANDLER, cleanup);
92
93 tst_require_root();
94
95 TEST_PAUSE;
96
97 tst_tmpdir();
98
99 /* Modify mode permissions on test directory */
100 SAFE_CHMOD(cleanup, ".", MODE_TO);
101
102 SAFE_TOUCH(cleanup, OLDPATH, 0777, NULL);
103 nobody_pwd = SAFE_GETPWNAM(cleanup, "nobody");
104 SAFE_SETEUID(cleanup, nobody_pwd->pw_uid);
105 }
106
cleanup(void)107 static void cleanup(void)
108 {
109 if (seteuid(0))
110 tst_resm(TWARN | TERRNO, "seteuid(0) failed");
111
112 tst_rmdir();
113 }
114