1/*
2 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, write the Free Software Foundation, Inc.,
14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
15 *
16 */
17/**********************************************************
18 *
19 *    TEST IDENTIFIER   : create_module02
20 *
21 *    EXECUTED BY       : root / superuser
22 *
23 *    TEST TITLE        : Checking error conditions for create_module(2)
24 *
25 *    TEST CASE TOTAL   : 8
26 *
27 *    AUTHOR            : Madhu T L <madhu.tarikere@wipro.com>
28 *
29 *    SIGNALS
30 *      Uses SIGUSR1 to pause before test if option set.
31 *      (See the parse_opts(3) man page).
32 *
33 *    DESCRIPTION
34 *      Verify that,
35 *      1. create_module(2) returns -1 and sets errno to EPERM, if effective
36 *         user id of the caller is not superuser.
37 *      2. create_module(2) returns -1 and sets errno to EFAULT, if module
38 *         name is outside the  program's  accessible  address space.
39 *      3. create_module(2) returns -1 and sets errno to EFAULT, if module
40 *         name parameter is NULL.
41 *      4. create_module(2) returns -1 and sets errno to EINVAL, if module
42 *         name parameter is null terminated (zero length) string.
43 *      5. create_module(2) returns -1 and sets errno to EEXIST, if module
44 *         entry with the same name already exists.
45 *      6. create_module(2) returns -1 and sets errno to EINVAL, if module
46 *         size parameter is too small.
47 *      7. create_module(2) returns -1 and sets errno to ENAMETOOLONG, if
48 *         module name parameter is too long.
49 *      8. create_module(2) returns -1 and sets errno to ENOMEM, if module
50 *         size parameter is too large.
51 *
52 *      Setup:
53 *        Setup signal handling.
54 *        Test caller is super user
55 *        Check existances of "nobody" user id.
56 *        Initialize  long module name
57 *        Set expected errnos for logging
58 *        Pause for SIGUSR1 if option specified.
59 *	  Initialize modname for each child process
60 *
61 *      Test:
62 *       Loop if the proper options are given.
63 *        Execute system call
64 *        Check return code and error number, if matching,
65 *                   Issue PASS message
66 *        Otherwise,
67 *                   Issue FAIL message
68 *
69 *      Cleanup:
70 *        Print errno log and/or timing stats if options given
71 *
72 * USAGE:  <for command-line>
73 *  create_module02 [-c n] [-e] [-f] [-h] [-i n] [-I x] [-p] [-P x] [-t]
74 *		where,  -c n : Run n copies concurrently.
75 *			-e   : Turn on errno logging.
76 *			-f   : Turn off functional testing
77 *			-h   : Show help screen
78 *			-i n : Execute test n times.
79 *			-I x : Execute test for x seconds.
80 *			-p   : Pause for SIGUSR1 before starting
81 *			-P x : Pause for x seconds between iterations.
82 *			-t   : Turn on syscall timing.
83 *
84 ****************************************************************/
85
86#include <errno.h>
87#include <pwd.h>
88#include <sys/types.h>
89#include <unistd.h>
90#include <limits.h>
91#include <asm/atomic.h>
92#include <linux/module.h>
93#include "test.h"
94
95#ifndef PAGE_SIZE
96#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
97#endif
98
99#define MODSIZE 10000		/* Arbitrarily selected MODSIZE */
100#define NULLMODNAME ""
101#define MAXMODSIZE  0xffffffffffffffff	/* Max size of size_t */
102#define SMALLMODSIZE  1		/* Arbitrarily selected SMALLMODSIZE */
103#define BASEMODNAME "dummy"
104#define LONGMODNAMECHAR 'm'	/* Arbitrarily selected the alphabet */
105#define MODNAMEMAX (PAGE_SIZE + 1)
106
107struct test_case_t {		/* test case structure */
108	char *modname;
109	size_t size;
110	caddr_t retval;		/* syscall return value */
111	int experrno;		/* expected errno */
112	char *desc;
113	int (*setup) (void);	/* Individual setup routine */
114	void (*cleanup) (void);	/* Individual cleanup routine */
115};
116
117char *TCID = "create_module02";
118static char nobody_uid[] = "nobody";
119struct passwd *ltpuser;
120static char longmodname[MODNAMEMAX];
121static int testno;
122static char modname[20];	/* Name of the module */
123
124static void setup(void);
125static void cleanup(void);
126static int setup1(void);
127static void cleanup1(void);
128static int setup2(void);
129static void cleanup2(void);
130
131static struct test_case_t tdat[] = {
132	{modname, MODSIZE, (caddr_t) - 1, EPERM,
133	 "non-superuser", setup1, cleanup1},
134	{(char *)-1, MODSIZE, (caddr_t) - 1, EFAULT,
135	 "module name outside the  program's  accessible  address space", NULL,
136	 NULL},
137	{NULL, MODSIZE, (caddr_t) - 1, EFAULT,
138	 "NULL module name", NULL, NULL},
139	{NULLMODNAME, MODSIZE, (caddr_t) - 1, EINVAL,
140	 "null terminated module name", NULL, NULL},
141	{modname, MODSIZE, (caddr_t) - 1, EEXIST,
142	 "already existing module", setup2, cleanup2},
143	{modname, SMALLMODSIZE, (caddr_t) - 1, EINVAL,
144	 "insufficient module size", NULL, NULL},
145	{longmodname, MODSIZE, (caddr_t) - 1, ENAMETOOLONG,
146	 "long module name", NULL, NULL},
147
148	/*
149	 *This test case is giving segmentation fault on
150	 * 2.4.* series, but works as expected with 2.5.* series of kernel.
151	 */
152	{modname, MAXMODSIZE, (caddr_t) - 1, ENOMEM,
153	 "large module size", NULL, NULL},
154};
155
156int TST_TOTAL = sizeof(tdat) / sizeof(tdat[0]);
157
158int main(int argc, char **argv)
159{
160	int lc;
161
162	tst_parse_opts(argc, argv, NULL, NULL);
163
164	setup();
165
166	for (lc = 0; TEST_LOOPING(lc); lc++) {
167		/* reset tst_count in case we are looping */
168		tst_count = 0;
169
170		for (testno = 0; testno < TST_TOTAL; ++testno) {
171			if ((tdat[testno].setup) && (tdat[testno].setup())) {
172				/* setup() failed, skip this test */
173				continue;
174			}
175
176			TEST(create_module(tdat[testno].modname,
177					   tdat[testno].size));
178			if ((TEST_RETURN == (int)tdat[testno].retval) &&
179			    (TEST_ERRNO == tdat[testno].experrno)) {
180				tst_resm(TPASS, "Expected results for %s, "
181					 "errno: %d",
182					 tdat[testno].desc, TEST_ERRNO);
183			} else {
184				tst_resm(TFAIL, "Unexpected results for %s ; "
185					 "returned %d (expected %d), errno %d "
186					 "(expected %d)", tdat[testno].desc,
187					 TEST_RETURN, tdat[testno].retval,
188					 TEST_ERRNO, tdat[testno].experrno);
189			}
190			if (tdat[testno].cleanup) {
191				tdat[testno].cleanup();
192			}
193		}
194	}
195	cleanup();
196	tst_exit();
197}
198
199int setup1(void)
200{
201	/* Change effective user id to nodody */
202	if (seteuid(ltpuser->pw_uid) == -1) {
203		tst_resm(TBROK, "seteuid failed to set the effective"
204			 " uid to %d", ltpuser->pw_uid);
205		return 1;
206	}
207	return 0;
208}
209
210void cleanup1(void)
211{
212	/* Change effective user id to root */
213	if (seteuid(0) == -1) {
214		tst_brkm(TBROK, NULL, "seteuid failed to set the effective"
215			 " uid to root");
216	}
217}
218
219int setup2(void)
220{
221	/* Create a loadable module entry */
222	if (create_module(modname, MODSIZE) == -1) {
223		tst_resm(TBROK, "Failed to create module entry"
224			 " for %s", modname);
225		return 1;
226	}
227	return 0;
228}
229
230void cleanup2(void)
231{
232	/* Remove loadable module entry */
233	if (delete_module(modname) == -1) {
234		tst_brkm(TBROK, NULL, "Failed to delete module entry"
235			 " for %s", modname);
236	}
237}
238
239/*
240 * setup()
241 *	performs all ONE TIME setup for this test
242 */
243void setup(void)
244{
245
246	tst_sig(NOFORK, DEF_HANDLER, cleanup);
247
248	tst_require_root();
249
250	if (tst_kvercmp(2, 5, 48) >= 0)
251		tst_brkm(TCONF, NULL, "This test will not work on "
252			 "kernels after 2.5.48");
253
254	/* Check for nobody_uid user id */
255	if ((ltpuser = getpwnam(nobody_uid)) == NULL) {
256		tst_brkm(TBROK, NULL, "Required user %s doesn't exists",
257			 nobody_uid);
258	}
259
260	/* Initialize longmodname to LONGMODNAMECHAR character */
261	memset(longmodname, LONGMODNAMECHAR, MODNAMEMAX - 1);
262
263	/* Pause if that option was specified
264	 * TEST_PAUSE contains the code to fork the test with the -c option.
265	 */
266	TEST_PAUSE;
267
268	/* Get unique module name for each child process */
269	if (sprintf(modname, "%s_%d", BASEMODNAME, getpid()) == -1) {
270		tst_brkm(TBROK, NULL, "Failed to initialize module name");
271	}
272}
273
274/*
275 * cleanup()
276 *	performs all ONE TIME cleanup for this test at
277 *	completion or premature exit
278 */
279void cleanup(void)
280{
281}
282