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: Veerendra C <vechandr@in.ibm.com>
17 *
18 * In Parent Process , create semaphore with key 154326L
19 * Now create container by passing 1 of the below flag values..
20 * clone(NONE), clone(CLONE_NEWIPC), or unshare(CLONE_NEWIPC)
21 * In cloned process, try to access the created semaphore
22 * Test PASS: If the semaphore is readable when flag is None.
23 * Test FAIL: If the semaphore is readable when flag is Unshare or Clone.
24 ***************************************************************************/
25
26 #define _GNU_SOURCE 1
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <string.h>
31 #include <sys/ipc.h>
32 #include <sys/sem.h>
33 #include <libclone.h>
34 #include "test.h"
35 #include "ipcns_helper.h"
36
37 #define MY_KEY 154326L
38 #define UNSHARESTR "unshare"
39 #define CLONESTR "clone"
40 #define NONESTR "none"
41
42 char *TCID = "sem_nstest";
43 int TST_TOTAL = 1;
44 int p1[2];
45 int p2[2];
46
check_semaphore(void * vtest)47 int check_semaphore(void *vtest)
48 {
49 char buf[3];
50 int id;
51
52 (void) vtest;
53
54 close(p1[1]);
55 close(p2[0]);
56
57 read(p1[0], buf, 3);
58 id = semget(MY_KEY, 1, 0);
59 if (id == -1)
60 write(p2[1], "notfnd", 7);
61 else {
62 write(p2[1], "exists", 7);
63 tst_resm(TINFO, "PID %d: Fetched existing semaphore..id = %d",
64 getpid(), id);
65 }
66 tst_exit();
67 }
68
setup(void)69 static void setup(void)
70 {
71 tst_require_root();
72 check_newipc();
73 }
74
main(int argc,char * argv[])75 int main(int argc, char *argv[])
76 {
77 int ret, use_clone = T_NONE, id;
78 char *tsttype = NONESTR;
79 char buf[7];
80
81 setup();
82
83 if (argc != 2) {
84 tst_resm(TFAIL, "Usage: %s <clone| unshare| none>", argv[0]);
85 tst_brkm(TFAIL, NULL, " where clone, unshare, or fork specifies"
86 " unshare method.");
87 }
88
89 /* Using PIPE's to sync between container and Parent */
90 if (pipe(p1) == -1) {
91 perror("pipe");
92 exit(EXIT_FAILURE);
93 }
94 if (pipe(p2) == -1) {
95 perror("pipe");
96 exit(EXIT_FAILURE);
97 }
98
99 if (strcmp(argv[1], "clone") == 0) {
100 use_clone = T_CLONE;
101 tsttype = CLONESTR;
102 } else if (strcmp(argv[1], "unshare") == 0) {
103 use_clone = T_UNSHARE;
104 tsttype = UNSHARESTR;
105 }
106
107 /* 1. Create (or fetch if existing) the binary semaphore */
108 id = semget(MY_KEY, 1, IPC_CREAT | IPC_EXCL | 0666);
109 if (id == -1) {
110 perror("Semaphore create");
111 if (errno != EEXIST) {
112 perror("semget failure");
113 tst_brkm(TBROK, NULL, "Semaphore creation failed");
114 }
115 id = semget(MY_KEY, 1, 0);
116 if (id == -1) {
117 perror("Semaphore create");
118 tst_brkm(TBROK, NULL, "Semaphore operation failed");
119 }
120 }
121
122 tst_resm(TINFO, "Semaphore namespaces Isolation test : %s", tsttype);
123 /* fire off the test */
124 ret =
125 do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_semaphore,
126 NULL);
127 if (ret < 0) {
128 tst_brkm(TFAIL, NULL, "%s failed", tsttype);
129 }
130
131 close(p1[0]);
132 close(p2[1]);
133 write(p1[1], "go", 3);
134 read(p2[0], buf, 7);
135
136 if (strcmp(buf, "exists") == 0) {
137 if (use_clone == T_NONE)
138 tst_resm(TPASS, "Plain cloned process found semaphore "
139 "inside container");
140 else
141 tst_resm(TFAIL,
142 "%s: Container init process found semaphore",
143 tsttype);
144 } else {
145 if (use_clone == T_NONE)
146 tst_resm(TFAIL,
147 "Plain cloned process didn't find semaphore");
148 else
149 tst_resm(TPASS, "%s: Container didn't find semaphore",
150 tsttype);
151 }
152
153 /* Delete the semaphore */
154 id = semget(MY_KEY, 1, 0);
155 semctl(id, IPC_RMID, 0);
156
157 tst_exit();
158 }
159