semctl04.c revision f6f0bf6255b6027b0b7e38c09413932240c9e3c3 
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "../lib/ipcsem.h"
61
62#include <pwd.h>
63
64char *TCID = "semctl04";
65int TST_TOTAL = 2;
66extern int Tst_count;
67
68int exp_enos[] = {EPERM, 0};	/* 0 terminated list of expected errnos */
69
70int sem_id_1 = -1;
71
72uid_t ltp_uid;
73char *ltp_user = "nobody";
74
75int TC[] = {IPC_SET, IPC_RMID};
76
77main(int ac, char **av)
78{
79	char *msg;			/* message returned from parse_opts */
80	pid_t pid;
81	void do_child(void);
82
83	/* parse standard options */
84	if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
85		tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
86	}
87
88	setup();			/* global setup */
89
90	if ((pid = fork()) == -1) {
91		tst_brkm(TBROK, cleanup, "could not fork");
92	}
93
94	if (pid == 0) {		/* child */
95		/* set the user ID of the child to the non root user */
96		if (setuid(ltp_uid) == -1) {
97			tst_resm(TBROK, "setuid() failed");
98			exit(1);
99		}
100
101		do_child();
102
103		cleanup();
104
105		/*NOTREACHED*/
106	} else {
107		if (waitpid(pid, NULL, 0) == -1) {
108			tst_resm(TBROK, "waitpid() failed");
109			tst_resm(TINFO, "waitpid() error = %d : %s", errno,
110				 strerror(errno));
111		}
112
113		/* if it exists, remove the semaphore resouce */
114		rm_sema(sem_id_1);
115
116		/* Remove the temporary directory */
117		tst_rmdir();
118	}
119}
120
121/*
122 * do_child() - make the TEST call as the child process
123 */
124void
125do_child()
126{
127	int lc;				/* loop counter */
128	int i;
129	union semun arg;
130	struct semid_ds perm;
131
132	/* The following loop checks looping state if -i option given */
133
134	for (lc = 0; TEST_LOOPING(lc); lc++) {
135		/* reset Tst_count in case we are looping */
136		Tst_count = 0;
137
138		for (i=0; i<TST_TOTAL; i++) {
139
140			if (TC[i] == IPC_SET)  {
141				arg.buf =  &perm;
142				memset(&perm, 0, sizeof perm);
143				perm.sem_perm.uid = getuid() + 1;
144				perm.sem_perm.gid = getgid() + 1;
145				perm.sem_perm.mode = 0666;
146			}
147
148
149			TEST(semctl(sem_id_1, 0, TC[i], arg.buf));
150
151			if (TEST_RETURN != -1) {
152				tst_resm(TFAIL, "call succeeded unexpectedly");
153				continue;
154			}
155
156			TEST_ERROR_LOG(TEST_ERRNO);
157
158			switch(TEST_ERRNO) {
159			case EPERM:
160				tst_resm(TPASS, "expected failure - errno ="
161					 " %d : %s", TEST_ERRNO,
162					 strerror(TEST_ERRNO));
163				break;
164			default:
165				tst_resm(TFAIL, "unexpected error "
166					 "- %d : %s", TEST_ERRNO,
167					 strerror(TEST_ERRNO));
168				break;
169			}
170		}
171	}
172}
173
174/*
175 * setup() - performs all the ONE TIME setup for this test.
176 */
177void
178setup(void)
179{
180	/* check for root as user id of process */
181	check_root();
182
183	/* capture signals */
184	tst_sig(FORK, DEF_HANDLER, cleanup);
185
186	/* Set up the expected error numbers for -e option */
187	TEST_EXP_ENOS(exp_enos);
188
189	/* Pause if that option was specified */
190	TEST_PAUSE;
191
192	/*
193	 * Create a temporary directory and cd into it.
194	 * This helps to ensure that a unique msgkey is created.
195	 * See ../lib/libipc.c for more information.
196	 */
197	tst_tmpdir();
198
199	/* get an IPC resource key */
200	semkey = getipckey();
201
202	/* create a semaphore set without read or alter permissions */
203	if ((sem_id_1 = semget(semkey, PSEMS, IPC_CREAT | IPC_EXCL)) == -1) {
204		tst_brkm(TBROK, cleanup, "couldn't create semaphore in setup");
205	}
206
207	/* get the userid for a non root user */
208	ltp_uid = getuserid(ltp_user);
209}
210
211/*
212 * cleanup() - performs all the ONE TIME cleanup for this test at completion
213 * 	       or premature exit.
214 */
215void
216cleanup(void)
217{
218	/*
219	 * print timing stats if that option was specified.
220	 * print errno log if that option was specified.
221	 */
222	TEST_CLEANUP;
223
224	/* exit with return code appropriate for results */
225	tst_exit();
226}
227
228