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 <unistd.h>
28 #include <stdlib.h>
29 #include <errno.h>
30 #include <string.h>
31 #include <signal.h>
32 #include "test.h"
33 #include "safe_macros.h"
34 #include "fchownat.h"
35 #include "lapi/fcntl.h"
36
37 #define TESTFILE "testfile"
38 #define TESTFILE_LINK "testfile_link"
39
40 char *TCID = "fchownat02";
41 int TST_TOTAL = 1;
42
43 static int dir_fd;
44 static uid_t set_uid = 1000;
45 static gid_t set_gid = 1000;
46 static void setup(void);
47 static void cleanup(void);
48 static void test_verify(void);
49 static void fchownat_verify(void);
50
main(int ac,char ** av)51 int main(int ac, char **av)
52 {
53 int lc;
54 int i;
55
56 tst_parse_opts(ac, av, NULL, NULL);
57
58 setup();
59
60 for (lc = 0; TEST_LOOPING(lc); lc++) {
61 tst_count = 0;
62 for (i = 0; i < TST_TOTAL; i++)
63 fchownat_verify();
64 }
65
66 cleanup();
67 tst_exit();
68 }
69
setup(void)70 static void setup(void)
71 {
72 struct stat c_buf, l_buf;
73
74 tst_require_root();
75
76 tst_sig(NOFORK, DEF_HANDLER, cleanup);
77
78 TEST_PAUSE;
79
80 tst_tmpdir();
81
82 dir_fd = SAFE_OPEN(cleanup, "./", O_DIRECTORY);
83
84 SAFE_TOUCH(cleanup, TESTFILE, 0600, NULL);
85
86 SAFE_SYMLINK(cleanup, TESTFILE, TESTFILE_LINK);
87
88 SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
89
90 SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
91
92 if (l_buf.st_uid == set_uid || l_buf.st_gid == set_gid) {
93 tst_brkm(TBROK | TERRNO, cleanup,
94 "link_uid(%d) == set_uid(%d) or link_gid(%d) == "
95 "set_gid(%d)", l_buf.st_uid, set_uid, l_buf.st_gid,
96 set_gid);
97 }
98 }
99
fchownat_verify(void)100 static void fchownat_verify(void)
101 {
102 TEST(fchownat(dir_fd, TESTFILE_LINK, set_uid, set_gid,
103 AT_SYMLINK_NOFOLLOW));
104
105 if (TEST_RETURN != 0) {
106 tst_resm(TFAIL | TTERRNO, "fchownat() failed, errno=%d : %s",
107 TEST_ERRNO, strerror(TEST_ERRNO));
108 } else {
109 test_verify();
110 }
111 }
112
test_verify(void)113 static void test_verify(void)
114 {
115 struct stat c_buf, l_buf;
116
117 SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
118
119 SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
120
121 if (c_buf.st_uid != set_uid && l_buf.st_uid == set_uid &&
122 c_buf.st_gid != set_gid && l_buf.st_gid == set_gid) {
123 tst_resm(TPASS, "fchownat() test AT_SYMLINK_NOFOLLOW success");
124 } else {
125 tst_resm(TFAIL,
126 "fchownat() test AT_SYMLINK_NOFOLLOW fail with uid=%d "
127 "link_uid=%d set_uid=%d | gid=%d link_gid=%d "
128 "set_gid=%d", c_buf.st_uid, l_buf.st_uid, set_uid,
129 c_buf.st_gid, l_buf.st_gid, set_gid);
130 }
131 }
132
cleanup(void)133 static void cleanup(void)
134 {
135 tst_rmdir();
136 }
137