1 /*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program.
15 */
16 /*
17 * Test Description:
18 * Verify that,
19 * The flag of fchownat() is AT_SYMLINK_NOFOLLOW and the pathname would
20 * not be dereferenced if the pathname is a symbolic link.
21 */
22
23 #define _GNU_SOURCE
24
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <fcntl.h>
28 #include <unistd.h>
29 #include <error.h>
30 #include <stdlib.h>
31 #include <errno.h>
32 #include <string.h>
33 #include <signal.h>
34 #include "test.h"
35 #include "safe_macros.h"
36 #include "fchownat.h"
37 #include "lapi/fcntl.h"
38
39 #define TESTFILE "testfile"
40 #define TESTFILE_LINK "testfile_link"
41
42 char *TCID = "fchownat02";
43 int TST_TOTAL = 1;
44
45 static int dir_fd;
46 static uid_t set_uid = 1000;
47 static gid_t set_gid = 1000;
48 static void setup(void);
49 static void cleanup(void);
50 static void test_verify(void);
51 static void fchownat_verify(void);
52
main(int ac,char ** av)53 int main(int ac, char **av)
54 {
55 int lc;
56 int i;
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 for (i = 0; i < TST_TOTAL; i++)
65 fchownat_verify();
66 }
67
68 cleanup();
69 tst_exit();
70 }
71
setup(void)72 static void setup(void)
73 {
74 struct stat c_buf, l_buf;
75
76 if ((tst_kvercmp(2, 6, 16)) < 0)
77 tst_brkm(TCONF, NULL, "This test needs kernel 2.6.16 or newer");
78
79 tst_require_root();
80
81 tst_sig(NOFORK, DEF_HANDLER, cleanup);
82
83 TEST_PAUSE;
84
85 tst_tmpdir();
86
87 dir_fd = SAFE_OPEN(cleanup, "./", O_DIRECTORY);
88
89 SAFE_TOUCH(cleanup, TESTFILE, 0600, NULL);
90
91 SAFE_SYMLINK(cleanup, TESTFILE, TESTFILE_LINK);
92
93 SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
94
95 SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
96
97 if (l_buf.st_uid == set_uid || l_buf.st_gid == set_gid) {
98 tst_brkm(TBROK | TERRNO, cleanup,
99 "link_uid(%d) == set_uid(%d) or link_gid(%d) == "
100 "set_gid(%d)", l_buf.st_uid, set_uid, l_buf.st_gid,
101 set_gid);
102 }
103 }
104
fchownat_verify(void)105 static void fchownat_verify(void)
106 {
107 TEST(fchownat(dir_fd, TESTFILE_LINK, set_uid, set_gid,
108 AT_SYMLINK_NOFOLLOW));
109
110 if (TEST_RETURN != 0) {
111 tst_resm(TFAIL | TTERRNO, "fchownat() failed, errno=%d : %s",
112 TEST_ERRNO, strerror(TEST_ERRNO));
113 } else {
114 test_verify();
115 }
116 }
117
test_verify(void)118 static void test_verify(void)
119 {
120 struct stat c_buf, l_buf;
121
122 SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
123
124 SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
125
126 if (c_buf.st_uid != set_uid && l_buf.st_uid == set_uid &&
127 c_buf.st_gid != set_gid && l_buf.st_gid == set_gid) {
128 tst_resm(TPASS, "fchownat() test AT_SYMLINK_NOFOLLOW success");
129 } else {
130 tst_resm(TFAIL,
131 "fchownat() test AT_SYMLINK_NOFOLLOW fail with uid=%d "
132 "link_uid=%d set_uid=%d | gid=%d link_gid=%d "
133 "set_gid=%d", c_buf.st_uid, l_buf.st_uid, set_uid,
134 c_buf.st_gid, l_buf.st_gid, set_gid);
135 }
136 }
137
cleanup(void)138 static void cleanup(void)
139 {
140 tst_rmdir();
141 }
142