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
107 struct 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
117 char *TCID = "create_module02";
118 static char nobody_uid[] = "nobody";
119 struct passwd *ltpuser;
120 static char longmodname[MODNAMEMAX];
121 static int testno;
122 static char modname[20]; /* Name of the module */
123
124 static void setup(void);
125 static void cleanup(void);
126 static int setup1(void);
127 static void cleanup1(void);
128 static int setup2(void);
129 static void cleanup2(void);
130
131 static 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
156 int TST_TOTAL = sizeof(tdat) / sizeof(tdat[0]);
157
main(int argc,char ** argv)158 int 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
setup1(void)199 int 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
cleanup1(void)210 void 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
setup2(void)219 int 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
cleanup2(void)230 void 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 */
setup(void)243 void 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 */
cleanup(void)279 void cleanup(void)
280 {
281 }
282