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1 /*
2  *
3  *   Copyright (c) International Business Machines  Corp., 2001
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software
17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 /*
21  * NAME
22  *	semctl04.c
23  *
24  * DESCRIPTION
25  *	semctl04 - test for EPERM error
26  *
27  * ALGORITHM
28  *	create a semaphore set without read or alter permissions
29  *	get the user id for "nobody"
30  *	fork a child process
31  *	if child
32  *	  set the ID of the child process to that of "nobody"
33  *	  loop if that option was specified
34  *	    call semctl() with two different invalid cases
35  *	    check the errno value
36  *	      issue a PASS message if we get EPERM
37  *	    otherwise, the tests fails
38  *	      issue a FAIL message
39  *	  call cleanup
40  *	if parent
41  *	  wait for child to exit
42  *	  remove the semaphore set
43  *
44  * USAGE:  <for command-line>
45  *  semctl04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
46  *     where,  -c n : Run n copies concurrently.
47  *             -e   : Turn on errno logging.
48  *	       -i n : Execute test n times.
49  *	       -I x : Execute test for x seconds.
50  *	       -P x : Pause for x seconds between iterations.
51  *	       -t   : Turn on syscall timing.
52  *
53  * HISTORY
54  *	03/2001 - Written by Wayne Boyer
55  *
56  * RESTRICTIONS
57  *	test must be run as root
58  */
59 
60 #include "ipcsem.h"
61 
62 #include <pwd.h>
63 #include <sys/wait.h>
64 
65 char *TCID = "semctl04";
66 int TST_TOTAL = 2;
67 
68 int sem_id_1 = -1;
69 
70 uid_t ltp_uid;
71 char *ltp_user = "nobody";
72 
73 int TC[] = { IPC_SET, IPC_RMID };
74 
main(int ac,char ** av)75 int main(int ac, char **av)
76 {
77 	pid_t pid;
78 	void do_child(void);
79 
80 	tst_parse_opts(ac, av, NULL, NULL);
81 
82 	setup();		/* global setup */
83 
84 	if ((pid = FORK_OR_VFORK()) == -1) {
85 		tst_brkm(TBROK, cleanup, "could not fork");
86 	}
87 
88 	if (pid == 0) {		/* child */
89 		/* set the user ID of the child to the non root user */
90 		if (setuid(ltp_uid) == -1) {
91 			tst_resm(TBROK, "setuid() failed");
92 			exit(1);
93 		}
94 
95 		do_child();
96 
97 	} else {
98 		if (waitpid(pid, NULL, 0) == -1) {
99 			tst_resm(TBROK, "waitpid() failed");
100 			tst_resm(TINFO, "waitpid() error = %d : %s", errno,
101 				 strerror(errno));
102 		}
103 
104 		/* if it exists, remove the semaphore resouce */
105 		rm_sema(sem_id_1);
106 
107 		tst_rmdir();
108 	}
109 	cleanup();
110 
111 	tst_exit();
112 }
113 
114 /*
115  * do_child() - make the TEST call as the child process
116  */
do_child(void)117 void do_child(void)
118 {
119 	int lc;
120 	int i;
121 	union semun arg;
122 	struct semid_ds perm;
123 
124 	/* The following loop checks looping state if -i option given */
125 
126 	for (lc = 0; TEST_LOOPING(lc); lc++) {
127 		/* reset tst_count in case we are looping */
128 		tst_count = 0;
129 
130 		for (i = 0; i < TST_TOTAL; i++) {
131 
132 			if (TC[i] == IPC_SET) {
133 				arg.buf = &perm;
134 				memset(&perm, 0, sizeof perm);
135 				perm.sem_perm.uid = getuid() + 1;
136 				perm.sem_perm.gid = getgid() + 1;
137 				perm.sem_perm.mode = 0666;
138 			}
139 
140 			TEST(semctl(sem_id_1, 0, TC[i], arg));
141 
142 			if (TEST_RETURN != -1) {
143 				tst_resm(TFAIL, "call succeeded unexpectedly");
144 				continue;
145 			}
146 
147 			switch (TEST_ERRNO) {
148 			case EPERM:
149 				tst_resm(TPASS, "expected failure - errno ="
150 					 " %d : %s", TEST_ERRNO,
151 					 strerror(TEST_ERRNO));
152 				break;
153 			default:
154 				tst_resm(TFAIL, "unexpected error "
155 					 "- %d : %s", TEST_ERRNO,
156 					 strerror(TEST_ERRNO));
157 				break;
158 			}
159 		}
160 	}
161 }
162 
163 /*
164  * setup() - performs all the ONE TIME setup for this test.
165  */
setup(void)166 void setup(void)
167 {
168 	tst_require_root();
169 
170 	tst_sig(FORK, DEF_HANDLER, cleanup);
171 
172 	TEST_PAUSE;
173 
174 	/*
175 	 * Create a temporary directory and cd into it.
176 	 * This helps to ensure that a unique msgkey is created.
177 	 * See ../lib/libipc.c for more information.
178 	 */
179 	tst_tmpdir();
180 
181 	/* get an IPC resource key */
182 	semkey = getipckey();
183 
184 	/* create a semaphore set without read or alter permissions */
185 	if ((sem_id_1 = semget(semkey, PSEMS, IPC_CREAT | IPC_EXCL)) == -1) {
186 		tst_brkm(TBROK, cleanup, "couldn't create semaphore in setup");
187 	}
188 
189 	/* get the userid for a non root user */
190 	ltp_uid = getuserid(ltp_user);
191 }
192 
193 /*
194  * cleanup() - performs all the ONE TIME cleanup for this test at completion
195  * 	       or premature exit.
196  */
cleanup(void)197 void cleanup(void)
198 {
199 
200 }
201