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
42char *TCID = "sem_nstest";
43int TST_TOTAL = 1;
44int p1[2];
45int p2[2];
46
47int 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
69static void setup(void)
70{
71	tst_require_root();
72	check_newipc();
73}
74
75int 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