1 /*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Xiaoguang Wang <wangxg.fnst@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; if not, write the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 /*
19 * Description:
20 * Verify that,
21 * 1) mknod(2) returns -1 and sets errno to EROFS if pathname refers to
22 * a file on a read-only file system.
23 * 2) mknod(2) returns -1 and sets errno to ELOOP if Too many symbolic
24 * links were encountered in resolving pathname.
25 */
26
27 #define _GNU_SOURCE
28
29 #include <sys/types.h>
30 #include <fcntl.h>
31 #include <sys/stat.h>
32 #include <error.h>
33 #include <stdlib.h>
34 #include <errno.h>
35 #include <string.h>
36 #include <signal.h>
37 #include <sys/mount.h>
38
39 #include "test.h"
40 #include "safe_macros.h"
41 #include "lapi/fcntl.h"
42 #include "mknodat.h"
43
44 static void setup(void);
45 static void cleanup(void);
46
47 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
48 S_IXGRP|S_IROTH|S_IXOTH)
49 #define MNT_POINT "mntpoint"
50
51 #define FIFOMODE (S_IFIFO | S_IRUSR | S_IRGRP | S_IROTH)
52 #define FREGMODE (S_IFREG | S_IRUSR | S_IRGRP | S_IROTH)
53 #define SOCKMODE (S_IFSOCK | S_IRUSR | S_IRGRP | S_IROTH)
54
55 static const char *device;
56 static int mount_flag;
57
58 static int dir_fd;
59 static int curfd = AT_FDCWD;
60
61 #define ELOPFILE "/test_eloop"
62 static char elooppathname[sizeof(ELOPFILE) * 43] = ".";
63
64 static struct test_case_t {
65 int *dir_fd;
66 char *pathname;
67 mode_t mode;
68 int exp_errno;
69 } test_cases[] = {
70 { &curfd, "tnode1", FIFOMODE, 0 },
71 { &curfd, "tnode2", FREGMODE, 0 },
72 { &curfd, "tnode3", SOCKMODE, 0 },
73 { &dir_fd, "tnode4", FIFOMODE, EROFS },
74 { &dir_fd, "tnode5", FREGMODE, EROFS },
75 { &dir_fd, "tnode6", SOCKMODE, EROFS },
76 { &curfd, elooppathname, FIFOMODE, ELOOP },
77 { &curfd, elooppathname, FREGMODE, ELOOP },
78 { &curfd, elooppathname, SOCKMODE, ELOOP },
79 };
80
81 static void mknodat_verify(struct test_case_t *tc);
82
83 char *TCID = "mknodat";
84 int TST_TOTAL = ARRAY_SIZE(test_cases);
85
main(int ac,char ** av)86 int main(int ac, char **av)
87 {
88 int lc, i;
89
90 tst_parse_opts(ac, av, NULL, NULL);
91
92 setup();
93
94 for (lc = 0; TEST_LOOPING(lc); lc++) {
95 tst_count = 0;
96
97 for (i = 0; i < TST_TOTAL; i++)
98 mknodat_verify(&test_cases[i]);
99 }
100
101 cleanup();
102 tst_exit();
103 }
104
setup(void)105 static void setup(void)
106 {
107 int i;
108 const char *fs_type;
109
110 if (tst_kvercmp(2, 6, 16) < 0) {
111 tst_brkm(TCONF, NULL, "This test can only run on kernels "
112 "that are 2.6.16 and higher");
113 }
114
115 tst_require_root();
116
117 tst_sig(NOFORK, DEF_HANDLER, cleanup);
118
119 tst_tmpdir();
120
121 fs_type = tst_dev_fs_type();
122 device = tst_acquire_device(cleanup);
123
124 if (!device)
125 tst_brkm(TCONF, cleanup, "Failed to acquire device");
126
127 tst_mkfs(cleanup, device, fs_type, NULL, NULL);
128
129 TEST_PAUSE;
130
131 /*
132 * mount a read-only file system for EROFS test
133 */
134 SAFE_MKDIR(cleanup, MNT_POINT, DIR_MODE);
135 if (mount(device, MNT_POINT, fs_type, MS_RDONLY, NULL) < 0) {
136 tst_brkm(TBROK | TERRNO, cleanup,
137 "mount device:%s failed", device);
138 }
139 mount_flag = 1;
140 dir_fd = SAFE_OPEN(cleanup, MNT_POINT, O_DIRECTORY);
141
142 /*
143 * NOTE: the ELOOP test is written based on that the consecutive
144 * symlinks limits in kernel is hardwired to 40.
145 */
146 SAFE_MKDIR(cleanup, "test_eloop", DIR_MODE);
147 SAFE_SYMLINK(cleanup, "../test_eloop", "test_eloop/test_eloop");
148 for (i = 0; i < 43; i++)
149 strcat(elooppathname, ELOPFILE);
150 }
151
mknodat_verify(struct test_case_t * tc)152 static void mknodat_verify(struct test_case_t *tc)
153 {
154 int fd = *(tc->dir_fd);
155 char *pathname = tc->pathname;
156 mode_t mode = tc->mode;
157
158 TEST(mknodat(fd, pathname, mode, 0));
159
160 if (TEST_ERRNO == tc->exp_errno) {
161 tst_resm(TPASS | TTERRNO,
162 "mknodat() returned the expected value");
163 } else {
164 tst_resm(TFAIL | TTERRNO,
165 "mknodat() got unexpected return value; expected: "
166 "%d - %s", tc->exp_errno,
167 strerror(tc->exp_errno));
168 }
169
170 if (TEST_ERRNO == 0 &&
171 ltp_syscall(__NR_unlinkat, fd, pathname, 0) < 0) {
172 tst_brkm(TBROK | TERRNO, cleanup, "unlinkat(%d, %s) "
173 "failed.", fd, pathname);
174 }
175 }
176
cleanup(void)177 static void cleanup(void)
178 {
179 if (dir_fd > 0 && close(dir_fd) < 0)
180 tst_resm(TWARN | TERRNO, "close(%d) failed", dir_fd);
181 if (mount_flag && tst_umount(MNT_POINT) < 0)
182 tst_resm(TWARN | TERRNO, "umount device:%s failed", device);
183
184 if (device)
185 tst_release_device(device);
186
187 tst_rmdir();
188 }
189