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 * Test Name: mknod02
22 *
23 * Test Description:
24 * Verify that mknod(2) succeeds when used to create a filesystem
25 * node with set group-ID bit set on a directory without set group-ID bit set.
26 * The node created should have set group-ID bit set and its gid should be
27 * equal to that of its parent directory.
28 *
29 * Expected Result:
30 * mknod() should return value 0 on success and node created should have
31 * set group-ID bit set, its gid should be equal to that of its parent
32 * directory.
33 *
34 * Algorithm:
35 * Setup:
36 * Setup signal handling.
37 * Create temporary directory.
38 * Pause for SIGUSR1 if option specified.
39 *
40 * Test:
41 * Loop if the proper options are given.
42 * Execute system call
43 * Check return code, if system call failed (return=-1)
44 * Log the errno and Issue a FAIL message.
45 * Otherwise,
46 * Verify the Functionality of system call
47 * if successful,
48 * Issue Functionality-Pass message.
49 * Otherwise,
50 * Issue Functionality-Fail message.
51 * Cleanup:
52 * Print errno log and/or timing stats if options given
53 * Delete the temporary directory created.
54 *
55 * Usage: <for command-line>
56 * mknod02 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
57 * where, -c n : Run n copies concurrently.
58 * -f : Turn off functionality Testing.
59 * -i n : Execute test n times.
60 * -I x : Execute test for x seconds.
61 * -P x : Pause for x seconds between iterations.
62 * -t : Turn on syscall timing.
63 *
64 * HISTORY
65 * 07/2001 Ported by Wayne Boyer
66 *
67 * RESTRICTIONS:
68 * This test should be run by 'super-user' (root) only.
69 *
70 */
71
72 #include <stdio.h>
73 #include <stdlib.h>
74 #include <unistd.h>
75 #include <errno.h>
76 #include <string.h>
77 #include <signal.h>
78 #include <pwd.h>
79 #include <sys/types.h>
80 #include <sys/stat.h>
81
82 #include "test.h"
83
84 #define LTPUSER "nobody"
85 #define MODE_RWX S_IFIFO | S_IRWXU | S_IRWXG | S_IRWXO
86 #define MODE_SGID S_IFIFO | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO
87 #define DIR_TEMP "testdir_2"
88 #define TNODE "tnode_%d"
89
90 struct stat buf; /* struct. to hold stat(2) o/p contents */
91 struct passwd *user1; /* struct. to hold getpwnam(3) o/p contents */
92
93 char *TCID = "mknod02";
94 int TST_TOTAL = 1;
95 char node_name[PATH_MAX]; /* buffer to hold node name created */
96
97 gid_t group1_gid, group2_gid, mygid; /* user and process group id's */
98 uid_t save_myuid, user1_uid; /* user and process user id's */
99 pid_t mypid; /* process id */
100
101 void setup(); /* setup function for the test */
102 void cleanup(); /* cleanup function for the test */
103
main(int ac,char ** av)104 int main(int ac, char **av)
105 {
106 int lc;
107 int fflag;
108
109 tst_parse_opts(ac, av, NULL, NULL);
110
111 setup();
112
113 for (lc = 0; TEST_LOOPING(lc); lc++) {
114
115 tst_count = 0;
116
117 /*
118 * Attempt to create a filesystem node with group-id bit set
119 * on a directory without group id bit set such that,
120 * the node created by mknod(2) should have group-id (sgid)
121 * bit set and node's gid should be equal to that of its
122 * parent directory.
123 */
124 TEST(mknod(node_name, MODE_SGID, 0));
125
126 /* Check return code from mknod(2) */
127 if (TEST_RETURN == -1) {
128 tst_resm(TFAIL,
129 "mknod(%s, %#o, 0) failed, errno=%d : %s",
130 node_name, MODE_SGID, TEST_ERRNO,
131 strerror(TEST_ERRNO));
132 continue;
133 }
134 /* Set the functionality flag */
135 fflag = 1;
136
137 /* Check for node's creation */
138 if (stat(node_name, &buf) < 0) {
139 tst_resm(TFAIL, "stat() of %s failed, errno:%d",
140 node_name, TEST_ERRNO);
141
142 /* unset functionality flag */
143 fflag = 0;
144 }
145
146 /* Verify mode permissions of node */
147 if (!(buf.st_mode & S_ISGID)) {
148 tst_resm(TFAIL, "%s: Incorrect modes, setgid "
149 "bit not set", node_name);
150 /* unset flag as functionality fails */
151 fflag = 0;
152 }
153
154 /* Verify group ID of node */
155 if (buf.st_gid != mygid) {
156 tst_resm(TFAIL, "%s: Incorrect group",
157 node_name);
158 /* unset flag as functionality fails */
159 fflag = 0;
160 }
161 if (fflag) {
162 tst_resm(TPASS, "Functionality of mknod(%s, "
163 "%#o, 0) successful",
164 node_name, MODE_SGID);
165 }
166
167 /* Remove the node for the next go `round */
168 if (unlink(node_name) == -1) {
169 tst_resm(TWARN, "unlink(%s) failed, errno:%d %s",
170 node_name, errno, strerror(errno));
171 }
172 }
173
174 /* Change the directory back to temporary directory */
175 chdir("..");
176
177 /*
178 * Invoke cleanup() to delete the test directories created
179 * in the setup() and exit main().
180 */
181 cleanup();
182
183 tst_exit();
184 }
185
186 /*
187 * setup(void) - performs all ONE TIME setup for this test.
188 * Exit the test program on receipt of unexpected signals.
189 * Create a temporary directory used to hold test directories created
190 * and change the directory to it.
191 * Verify that pid of process executing the test is root.
192 * Create a test directory on temporary directory and set the ownership
193 * of test directory to ltp user and process.
194 * Set the effective uid/gid of the process to that of ltp user.
195 */
setup(void)196 void setup(void)
197 {
198 tst_require_root();
199
200 /* Capture unexpected signals */
201 tst_sig(NOFORK, DEF_HANDLER, cleanup);
202
203 TEST_PAUSE;
204
205 /* Make a temp dir and cd to it */
206 tst_tmpdir();
207
208 /* fix permissions on the tmpdir */
209 if (chmod(".", 0711) != 0) {
210 tst_brkm(TBROK, cleanup, "chmod() failed");
211 }
212
213 /* Save the real user id of the current test process */
214 save_myuid = getuid();
215
216 /* Save the process id of the current test process */
217 mypid = getpid();
218
219 /* Get the node name to be created in the test */
220 sprintf(node_name, TNODE, mypid);
221
222 /* Get the uid/gid of ltpuser */
223 if ((user1 = getpwnam(LTPUSER)) == NULL) {
224 tst_brkm(TBROK | TERRNO, cleanup,
225 "Couldn't determine if %s was in /etc/passwd",
226 LTPUSER);
227 }
228 user1_uid = user1->pw_uid;
229 group1_gid = user1->pw_gid;
230
231 /* Get the effective group id of the test process */
232 group2_gid = getegid();
233
234 /*
235 * Create a test directory under temporary directory with the
236 * specified mode permissions, with uid/gid set to that of guest
237 * user and the test process.
238 */
239 if (mkdir(DIR_TEMP, MODE_RWX) < 0) {
240 tst_brkm(TBROK, cleanup, "mkdir(2) of %s failed", DIR_TEMP);
241 }
242 if (chown(DIR_TEMP, user1_uid, group2_gid) < 0) {
243 tst_brkm(TBROK, cleanup, "chown(2) of %s failed", DIR_TEMP);
244 }
245
246 /*
247 * Verify that test directory created with expected permission modes
248 * and ownerships.
249 */
250 if (stat(DIR_TEMP, &buf) < 0) {
251 tst_brkm(TBROK, cleanup, "stat(2) of %s failed", DIR_TEMP);
252 }
253
254 /* Verify modes of test directory */
255 if (buf.st_mode & S_ISGID) {
256 tst_brkm(TBROK, cleanup,
257 "%s: Incorrect modes, setgid bit set", DIR_TEMP);
258 }
259
260 /* Verify group ID of test directory */
261 if (buf.st_gid != group2_gid) {
262 tst_brkm(TBROK, cleanup, "%s: Incorrect group", DIR_TEMP);
263 }
264
265 /*
266 * Set the effective group id and user id of the test process
267 * to that of guest user.
268 */
269 if (setgid(group1_gid) < 0) {
270 tst_brkm(TBROK, cleanup,
271 "Unable to set process gid to that of ltpuser");
272 }
273 if (setreuid(-1, user1_uid) < 0) {
274 tst_brkm(TBROK, cleanup,
275 "Unable to set process uid to that of ltp user");
276 }
277
278 /* Save the real group ID of the current process */
279 mygid = getgid();
280
281 /* Change directory to DIR_TEMP */
282 if (chdir(DIR_TEMP) < 0) {
283 tst_brkm(TBROK, cleanup,
284 "Unable to change to %s directory", DIR_TEMP);
285 }
286 }
287
288 /*
289 * cleanup() - Performs all ONE TIME cleanup for this test at
290 * completion or premature exit.
291 * Print test timing stats and errno log if test executed with options.
292 * Restore the real/effective user id of the process changed during
293 * setup().
294 * Remove temporary directory and sub-directories/files under it
295 * created during setup().
296 * Exit the test program with normal exit code.
297 */
cleanup(void)298 void cleanup(void)
299 {
300
301 /*
302 * Restore the effective uid of the process changed in the
303 * setup().
304 */
305 if (setreuid(-1, save_myuid) < 0) {
306 tst_brkm(TBROK, NULL,
307 "resetting process real/effective uid failed");
308 }
309
310 tst_rmdir();
311
312 }
313