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: mknod04
22 *
23 * Test Description:
24 * Verify that mknod(2) succeeds when used to create a filesystem
25 * node on a directory with set group-ID bit set.
26 * The node created should not have group-ID bit set and its gid should be
27 * equal to the effective gid of the process.
28 *
29 * Expected Result:
30 * mknod() should return value 0 on success and node created should not
31 * have set group-ID bit set and its gid should be equal to the effective
32 * gid of the process.
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 * mknod04 [-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 #include "safe_macros.h"
84
85 #define LTPUSER "nobody"
86 #define MODE_RWX S_IFIFO | S_IRWXU | S_IRWXG | S_IRWXO
87 #define MODE_SGID S_IFIFO | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO
88 #define DIR_TEMP "testdir_4"
89 #define TNODE "tnode_%d"
90
91 struct stat buf; /* struct. to hold stat(2) o/p contents */
92 struct passwd *user1; /* struct. to hold getpwnam(3) o/p contents */
93
94 char *TCID = "mknod04";
95 int TST_TOTAL = 1;
96 char node_name[PATH_MAX]; /* buffer to hold node name created */
97
98 gid_t group1_gid, group2_gid, mygid; /* user and process group id's */
99 uid_t save_myuid, user1_uid; /* user and process user id's */
100 pid_t mypid; /* process id */
101
102 void setup(); /* setup function for the test */
103 void cleanup(); /* cleanup function for the test */
104
main(int ac,char ** av)105 int main(int ac, char **av)
106 {
107 int lc;
108 int fflag;
109
110 tst_parse_opts(ac, av, NULL, NULL);
111
112 setup();
113
114 for (lc = 0; TEST_LOOPING(lc); lc++) {
115
116 tst_count = 0;
117
118 /*
119 * TEST CASE CONDITION:
120 * Attempt to create a filesystem node on a directory
121 * with group id (sgid) bit set such that,
122 * the node created by mknod(2) should not have group id
123 * (sgid) bit set and node's gid should be equal to the
124 * effective gid of the process.
125 */
126 TEST(mknod(node_name, MODE_RWX, 0));
127
128 /* Check return code from mknod(2) */
129 if (TEST_RETURN == -1) {
130 tst_resm(TFAIL, "mknod(%s, %#o, 0) failed, errno=%d : "
131 "%s", node_name, MODE_RWX, TEST_ERRNO,
132 strerror(TEST_ERRNO));
133 continue;
134 }
135 /* Set the functionality flag */
136 fflag = 1;
137
138 /* Check for node's creation */
139 if (stat(node_name, &buf) < 0) {
140 tst_resm(TFAIL, "stat() of %s failed, errno:%d",
141 node_name, TEST_ERRNO);
142 /* unset fflag */
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 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 != group2_gid) {
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_RWX);
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 SAFE_CHDIR(cleanup, "..");
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 * void
188 * setup(void) - performs all ONE TIME setup for this test.
189 * Exit the test program on receipt of unexpected signals.
190 * Create a temporary directory used to hold test directories created
191 * and change the directory to it.
192 * Verify that pid of process executing the test is root.
193 * Create a test directory on temporary directory and set the ownership
194 * of test directory to guest user and process, change mode permissions
195 * to set group-id bit on it.
196 * Set the effective uid/gid of the process to that of guest user.
197 */
setup(void)198 void setup(void)
199 {
200 tst_require_root();
201
202 /* Capture unexpected signals */
203 tst_sig(NOFORK, DEF_HANDLER, cleanup);
204
205 TEST_PAUSE;
206
207 /* Make a temp dir and cd to it */
208 tst_tmpdir();
209
210 /* fix permissions on the tmpdir */
211 if (chmod(".", 0711) != 0) {
212 tst_brkm(TBROK, cleanup, "chmod() failed");
213 }
214
215 /* Save the real user id of the current test process */
216 save_myuid = getuid();
217
218 /* Save the process id of the current test process */
219 mypid = getpid();
220
221 /* Get the node name to be created in the test */
222 sprintf(node_name, TNODE, mypid);
223
224 /* Get the uid/gid of ltp user */
225 if ((user1 = getpwnam(LTPUSER)) == NULL) {
226 tst_brkm(TBROK, cleanup, "%s not in /etc/passwd", 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 SAFE_MKDIR(cleanup, DIR_TEMP, MODE_RWX);
240 SAFE_CHOWN(cleanup, DIR_TEMP, user1_uid, group2_gid);
241 SAFE_CHMOD(cleanup, DIR_TEMP, MODE_SGID);
242
243 /*
244 * Verify that test directory created with expected permission modes
245 * and ownerships.
246 */
247 SAFE_STAT(cleanup, DIR_TEMP, &buf);
248
249 /* Verify modes of test directory */
250 if (!(buf.st_mode & S_ISGID)) {
251 tst_brkm(TBROK, cleanup,
252 "%s: Incorrect modes, setgid bit not set", DIR_TEMP);
253 }
254
255 /* Verify group ID */
256 if (buf.st_gid != group2_gid) {
257 tst_brkm(TBROK, cleanup, "%s: Incorrect group", DIR_TEMP);
258 }
259
260 /*
261 * Set the effective group id and user id of the test process
262 * to that of guest user (nobody)
263 */
264 SAFE_SETGID(cleanup, group1_gid);
265 if (setreuid(-1, user1_uid) < 0) {
266 tst_brkm(TBROK, cleanup,
267 "Unable to set process uid to that of ltp user");
268 }
269
270 /* Save the real group ID of the current process */
271 mygid = getgid();
272
273 /* Change directory to DIR_TEMP */
274 SAFE_CHDIR(cleanup, DIR_TEMP);
275 }
276
277 /*
278 * cleanup() - Performs all ONE TIME cleanup for this test at
279 * completion or premature exit.
280 * Print test timing stats and errno log if test executed with options.
281 * Restore the real/effective user id of the process changed during
282 * setup().
283 * Remove temporary directory and sub-directories/files under it
284 * created during setup().
285 * Exit the test program with normal exit code.
286 */
cleanup(void)287 void cleanup(void)
288 {
289
290 /*
291 * Restore the effective uid of the process changed in the
292 * setup().
293 */
294 if (setreuid(-1, save_myuid) < 0) {
295 tst_brkm(TBROK, cleanup,
296 "resetting process real/effective uid failed");
297 }
298
299 tst_rmdir();
300
301 }
302