1 /*
2 * Copyright (c) International Business Machines Corp., 2009
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
11 * the GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15 *
16 * Author: Serge Hallyn <serue@us.ibm.com>
17 *
18 * Check mqueuefs lifetime
19 * . parent creates /dev/mqueue2
20 * . child mounts mqueue there
21 * . child does mq_open("/ab")
22 * . parent checks for /dev/mqueue2
23 * . child exits
24 * . parent checks for /dev/mqueue2
25 * . parent tries 'touch /dev/mqueue2/dd' -> should fail
26 * . parent umounts /dev/mqueue2
27
28 ***************************************************************************/
29
30 #ifndef _GNU_SOURCE
31 #define _GNU_SOURCE
32 #endif
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <sys/wait.h>
36 #include <assert.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <unistd.h>
40 #include <string.h>
41 #include <errno.h>
42 #include "mqns.h"
43 #include "mqns_helper.h"
44
45 char *TCID = "posixmq_namespace_04";
46 int TST_TOTAL = 1;
47
48 int p1[2];
49 int p2[2];
50
51 #define FNAM1 DEV_MQUEUE2 SLASH_MQ1
52 #define FNAM2 DEV_MQUEUE2 SLASH_MQ2
53
check_mqueue(void * vtest)54 int check_mqueue(void *vtest)
55 {
56 char buf[30];
57 mqd_t mqd;
58 int rc;
59
60 (void) vtest;
61
62 close(p1[1]);
63 close(p2[0]);
64
65 read(p1[0], buf, 3); /* go */
66
67 mqd = ltp_syscall(__NR_mq_open, NOSLASH_MQ1, O_RDWR | O_CREAT | O_EXCL,
68 0755, NULL);
69 if (mqd == -1) {
70 write(p2[1], "mqfail", 7);
71 tst_exit();
72 }
73
74 mq_close(mqd);
75
76 rc = mount("mqueue", DEV_MQUEUE2, "mqueue", 0, NULL);
77 if (rc == -1) {
78 perror("mount");
79 write(p2[1], "mount", 6);
80 tst_exit();
81 }
82
83 write(p2[1], "go", 3);
84 read(p1[0], buf, 3);
85
86 tst_exit();
87 }
88
setup(void)89 static void setup(void)
90 {
91 tst_require_root();
92 check_mqns();
93 }
94
main(int argc,char * argv[])95 int main(int argc, char *argv[])
96 {
97 int rc;
98 int status;
99 char buf[30];
100 struct stat statbuf;
101 int use_clone = T_UNSHARE;
102
103 setup();
104
105 if (argc == 2 && strcmp(argv[1], "-clone") == 0) {
106 tst_resm(TINFO,
107 "Testing posix mq namespaces through clone(2).");
108 use_clone = T_CLONE;
109 } else
110 tst_resm(TINFO,
111 "Testing posix mq namespaces through unshare(2).");
112
113 if (pipe(p1) == -1) {
114 perror("pipe");
115 exit(EXIT_FAILURE);
116 }
117 if (pipe(p2) == -1) {
118 perror("pipe");
119 exit(EXIT_FAILURE);
120 }
121
122 mkdir(DEV_MQUEUE2, 0755);
123
124 tst_resm(TINFO, "Checking mqueue filesystem lifetime");
125
126 /* fire off the test */
127 rc = do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_mqueue, NULL);
128 if (rc < 0) {
129 tst_resm(TFAIL, "failed clone/unshare");
130 goto fail;
131 }
132
133 close(p1[0]);
134 close(p2[1]);
135 write(p1[1], "go", 3);
136
137 read(p2[0], buf, 7);
138 if (!strcmp(buf, "mqfail")) {
139 tst_resm(TFAIL, "child process could not create mqueue");
140 goto fail;
141 } else if (!strcmp(buf, "mount")) {
142 tst_resm(TFAIL, "child process could not mount mqueue");
143 goto fail;
144 }
145
146 rc = stat(FNAM1, &statbuf);
147 if (rc == -1) {
148 perror("stat");
149 write(p1[1], "go", 3);
150 tst_resm(TFAIL, "parent could not see child's created mq");
151 goto fail;
152 }
153 write(p1[1], "go", 3);
154
155 rc = wait(&status);
156 if (rc == -1) {
157 perror("wait");
158 tst_resm(TFAIL, "error while parent waited on child to exit");
159 goto fail;
160 }
161 if (!WIFEXITED(status)) {
162 tst_resm(TFAIL, "Child did not exit normally (status %d)",
163 status);
164 goto fail;
165 }
166 rc = stat(FNAM1, &statbuf);
167 if (rc == -1) {
168 tst_resm(TFAIL,
169 "parent's view of child's mq died with child");
170 goto fail;
171 }
172
173 rc = creat(FNAM2, 0755);
174 if (rc != -1) {
175 tst_resm(TFAIL,
176 "parent was able to create a file in dead child's mqfs");
177 goto fail;
178 }
179
180 tst_resm(TPASS, "Child mqueue fs still visible for parent");
181
182 fail:
183 umount(DEV_MQUEUE2);
184 rmdir(DEV_MQUEUE2);
185
186 tst_exit();
187 }
188