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 <stdlib.h>
33 #include <errno.h>
34 #include <string.h>
35 #include <signal.h>
36 #include <sys/mount.h>
37
38 #include "test.h"
39 #include "safe_macros.h"
40 #include "lapi/fcntl.h"
41 #include "mknodat.h"
42
43 static void setup(void);
44 static void cleanup(void);
45
46 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
47 S_IXGRP|S_IROTH|S_IXOTH)
48 #define MNT_POINT "mntpoint"
49
50 #define FIFOMODE (S_IFIFO | S_IRUSR | S_IRGRP | S_IROTH)
51 #define FREGMODE (S_IFREG | S_IRUSR | S_IRGRP | S_IROTH)
52 #define SOCKMODE (S_IFSOCK | S_IRUSR | S_IRGRP | S_IROTH)
53
54 static const char *device;
55 static int mount_flag;
56
57 static int dir_fd;
58 static int curfd = AT_FDCWD;
59
60 #define ELOPFILE "/test_eloop"
61 static char elooppathname[sizeof(ELOPFILE) * 43] = ".";
62
63 static struct test_case_t {
64 int *dir_fd;
65 char *pathname;
66 mode_t mode;
67 int exp_errno;
68 } test_cases[] = {
69 { &curfd, "tnode1", FIFOMODE, 0 },
70 { &curfd, "tnode2", FREGMODE, 0 },
71 { &curfd, "tnode3", SOCKMODE, 0 },
72 { &dir_fd, "tnode4", FIFOMODE, EROFS },
73 { &dir_fd, "tnode5", FREGMODE, EROFS },
74 { &dir_fd, "tnode6", SOCKMODE, EROFS },
75 { &curfd, elooppathname, FIFOMODE, ELOOP },
76 { &curfd, elooppathname, FREGMODE, ELOOP },
77 { &curfd, elooppathname, SOCKMODE, ELOOP },
78 };
79
80 static void mknodat_verify(struct test_case_t *tc);
81
82 char *TCID = "mknodat";
83 int TST_TOTAL = ARRAY_SIZE(test_cases);
84
main(int ac,char ** av)85 int main(int ac, char **av)
86 {
87 int lc, i;
88
89 tst_parse_opts(ac, av, NULL, NULL);
90
91 setup();
92
93 for (lc = 0; TEST_LOOPING(lc); lc++) {
94 tst_count = 0;
95
96 for (i = 0; i < TST_TOTAL; i++)
97 mknodat_verify(&test_cases[i]);
98 }
99
100 cleanup();
101 tst_exit();
102 }
103
setup(void)104 static void setup(void)
105 {
106 int i;
107 const char *fs_type;
108
109 if (tst_kvercmp(2, 6, 16) < 0) {
110 tst_brkm(TCONF, NULL, "This test can only run on kernels "
111 "that are 2.6.16 and higher");
112 }
113
114 tst_require_root();
115
116 tst_sig(NOFORK, DEF_HANDLER, cleanup);
117
118 tst_tmpdir();
119
120 fs_type = tst_dev_fs_type();
121 device = tst_acquire_device(cleanup);
122
123 if (!device)
124 tst_brkm(TCONF, cleanup, "Failed to acquire device");
125
126 tst_mkfs(cleanup, device, fs_type, NULL, NULL);
127
128 TEST_PAUSE;
129
130 /*
131 * mount a read-only file system for EROFS test
132 */
133 SAFE_MKDIR(cleanup, MNT_POINT, DIR_MODE);
134 SAFE_MOUNT(cleanup, device, MNT_POINT, fs_type, MS_RDONLY, NULL);
135 mount_flag = 1;
136 dir_fd = SAFE_OPEN(cleanup, MNT_POINT, O_DIRECTORY);
137
138 /*
139 * NOTE: the ELOOP test is written based on that the consecutive
140 * symlinks limits in kernel is hardwired to 40.
141 */
142 SAFE_MKDIR(cleanup, "test_eloop", DIR_MODE);
143 SAFE_SYMLINK(cleanup, "../test_eloop", "test_eloop/test_eloop");
144 for (i = 0; i < 43; i++)
145 strcat(elooppathname, ELOPFILE);
146 }
147
mknodat_verify(struct test_case_t * tc)148 static void mknodat_verify(struct test_case_t *tc)
149 {
150 int fd = *(tc->dir_fd);
151 char *pathname = tc->pathname;
152 mode_t mode = tc->mode;
153
154 TEST(mknodat(fd, pathname, mode, 0));
155
156 if (TEST_ERRNO == tc->exp_errno) {
157 tst_resm(TPASS | TTERRNO,
158 "mknodat() returned the expected value");
159 } else {
160 tst_resm(TFAIL | TTERRNO,
161 "mknodat() got unexpected return value; expected: "
162 "%d - %s", tc->exp_errno,
163 strerror(tc->exp_errno));
164 }
165
166 if (TEST_ERRNO == 0 &&
167 ltp_syscall(__NR_unlinkat, fd, pathname, 0) < 0) {
168 tst_brkm(TBROK | TERRNO, cleanup, "unlinkat(%d, %s) "
169 "failed.", fd, pathname);
170 }
171 }
172
cleanup(void)173 static void cleanup(void)
174 {
175 if (dir_fd > 0 && close(dir_fd) < 0)
176 tst_resm(TWARN | TERRNO, "close(%d) failed", dir_fd);
177 if (mount_flag && tst_umount(MNT_POINT) < 0)
178 tst_resm(TWARN | TERRNO, "umount device:%s failed", device);
179
180 if (device)
181 tst_release_device(device);
182
183 tst_rmdir();
184 }
185