1 /*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Zeng Linggang <[email protected]>
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 "lapi/fcntl.h"
35
36 #define TESTFILE "testfile"
37 #define TESTFILE_LINK "testfile_link"
38
39 char *TCID = "fchownat02";
40 int TST_TOTAL = 1;
41
42 static int dir_fd;
43 static uid_t set_uid = 1000;
44 static gid_t set_gid = 1000;
45 static void setup(void);
46 static void cleanup(void);
47 static void test_verify(void);
48 static void fchownat_verify(void);
49
main(int ac,char ** av)50 int main(int ac, char **av)
51 {
52 int lc;
53 int i;
54
55 tst_parse_opts(ac, av, NULL, NULL);
56
57 setup();
58
59 for (lc = 0; TEST_LOOPING(lc); lc++) {
60 tst_count = 0;
61 for (i = 0; i < TST_TOTAL; i++)
62 fchownat_verify();
63 }
64
65 cleanup();
66 tst_exit();
67 }
68
setup(void)69 static void setup(void)
70 {
71 struct stat c_buf, l_buf;
72
73 tst_require_root();
74
75 tst_sig(NOFORK, DEF_HANDLER, cleanup);
76
77 TEST_PAUSE;
78
79 tst_tmpdir();
80
81 dir_fd = SAFE_OPEN(cleanup, "./", O_DIRECTORY);
82
83 SAFE_TOUCH(cleanup, TESTFILE, 0600, NULL);
84
85 SAFE_SYMLINK(cleanup, TESTFILE, TESTFILE_LINK);
86
87 SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
88
89 SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
90
91 if (l_buf.st_uid == set_uid || l_buf.st_gid == set_gid) {
92 tst_brkm(TBROK | TERRNO, cleanup,
93 "link_uid(%d) == set_uid(%d) or link_gid(%d) == "
94 "set_gid(%d)", l_buf.st_uid, set_uid, l_buf.st_gid,
95 set_gid);
96 }
97 }
98
fchownat_verify(void)99 static void fchownat_verify(void)
100 {
101 TEST(fchownat(dir_fd, TESTFILE_LINK, set_uid, set_gid,
102 AT_SYMLINK_NOFOLLOW));
103
104 if (TEST_RETURN != 0) {
105 tst_resm(TFAIL | TTERRNO, "fchownat() failed, errno=%d : %s",
106 TEST_ERRNO, strerror(TEST_ERRNO));
107 } else {
108 test_verify();
109 }
110 }
111
test_verify(void)112 static void test_verify(void)
113 {
114 struct stat c_buf, l_buf;
115
116 SAFE_STAT(cleanup, TESTFILE_LINK, &c_buf);
117
118 SAFE_LSTAT(cleanup, TESTFILE_LINK, &l_buf);
119
120 if (c_buf.st_uid != set_uid && l_buf.st_uid == set_uid &&
121 c_buf.st_gid != set_gid && l_buf.st_gid == set_gid) {
122 tst_resm(TPASS, "fchownat() test AT_SYMLINK_NOFOLLOW success");
123 } else {
124 tst_resm(TFAIL,
125 "fchownat() test AT_SYMLINK_NOFOLLOW fail with uid=%d "
126 "link_uid=%d set_uid=%d | gid=%d link_gid=%d "
127 "set_gid=%d", c_buf.st_uid, l_buf.st_uid, set_uid,
128 c_buf.st_gid, l_buf.st_gid, set_gid);
129 }
130 }
131
cleanup(void)132 static void cleanup(void)
133 {
134 tst_rmdir();
135 }
136