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 * NAME
22 * chdir03
23 *
24 * DESCRIPTION
25 * Testcase for testing that chdir(2) sets EACCES errno
26 *
27 * ALGORITHM
28 * 1. create a child process, sets its uid to ltpuser1
29 * 2. this child creates a directory with perm 700, and exits
30 * 3. create another child process, sets its uid to ltpuser2
31 * 4. this child attempts to chdir(2) to the directory created in 2.
32 * and expects to get an EACCES.
33 *
34 * USAGE: <for command-line>
35 * chdir03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
36 * where, -c n : Run n copies concurrently.
37 * -e : Turn on errno logging.
38 * -i n : Execute test n times.
39 * -I x : Execute test for x seconds.
40 * -P x : Pause for x seconds between iterations.
41 * -t : Turn on syscall timing.
42 *
43 * HISTORY
44 * 07/2001 Ported by Wayne Boyer
45 *
46 * RESTRICTIONS
47 * This test must be run as root.
48 */
49
50 #include <stdio.h>
51 #include <sys/types.h>
52 #include <unistd.h>
53 #include <pwd.h>
54 #include <errno.h>
55 #include <sys/wait.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <sys/stat.h>
59 #include <sys/types.h>
60
61 #include "test.h"
62 #include "safe_macros.h"
63
64 char *TCID = "chdir03";
65 int TST_TOTAL = 1;
66
67 void setup(void);
68 void cleanup(void);
69
70 char good_dir[100];
71
72 static uid_t nobody_uid, bin_uid;
73
main(int ac,char ** av)74 int main(int ac, char **av)
75 {
76 int lc;
77
78 pid_t pid, pid1;
79 int status;
80
81 tst_parse_opts(ac, av, NULL, NULL);
82
83 setup();
84
85 for (lc = 0; TEST_LOOPING(lc); lc++) {
86 tst_count = 0;
87
88 if ((pid = FORK_OR_VFORK()) < 0) {
89 tst_brkm(TBROK, cleanup, "first fork failed");
90 }
91
92 if (pid == 0) {
93 if (setreuid(nobody_uid, nobody_uid) != 0) {
94 perror("setreuid failed in child #1");
95 exit(1);
96 }
97 if (mkdir(good_dir, 00700) != 0) {
98 perror("mkdir failed in child #1");
99 exit(1);
100 }
101 exit(0);
102 }
103 wait(&status);
104
105 if ((pid1 = FORK_OR_VFORK()) < 0)
106 tst_brkm(TBROK, cleanup, "second fork failed");
107
108 if (pid1 == 0) { /* second child */
109
110 int rval;
111
112 /*
113 * set the child's ID to ltpuser2 using seteuid()
114 * so that the ID can be changed back after the
115 * TEST call is made.
116 */
117 if (seteuid(bin_uid) != 0) {
118 perror("setreuid failed in child #2");
119 exit(1);
120 }
121
122 TEST(chdir(good_dir));
123
124 if (TEST_RETURN != -1) {
125 printf("call succeeded unexpectedly\n");
126 rval = 1;
127 } else if (TEST_ERRNO != EACCES) {
128 printf("didn't get EACCES as expected; got ");
129 rval = 1;
130 } else {
131 printf("got EACCES as expected\n");
132 rval = 0;
133 }
134 /* Only really required with vfork. */
135 if (seteuid(0) != 0) {
136 perror("seteuid(0) failed");
137 rval = 1;
138 }
139
140 exit(rval);
141
142 } else {
143 if (wait(&status) == -1)
144 tst_brkm(TBROK | TERRNO, cleanup,
145 "wait failed");
146 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
147 tst_brkm(TBROK, cleanup,
148 "child exited abnormally");
149 tst_resm(TPASS, "child reported success");
150 }
151 if (rmdir(good_dir) == -1) {
152 tst_brkm(TBROK | TERRNO, cleanup,
153 "rmdir(%s) failed", good_dir);
154 }
155 }
156
157 cleanup();
158 tst_exit();
159 }
160
setup(void)161 void setup(void)
162 {
163 struct passwd *pw;
164 char *cur_dir = NULL;
165
166 tst_require_root();
167
168 pw = SAFE_GETPWNAM(NULL, "nobody");
169 nobody_uid = pw->pw_uid;
170 #ifndef ANDROID
171 pw = SAFE_GETPWNAM(NULL, "bin");
172 #else
173 // user "bin" does not exist in Android kernel
174 pw = SAFE_GETPWNAM(NULL, "everybody");
175 #endif
176 bin_uid = pw->pw_uid;
177
178 tst_sig(FORK, DEF_HANDLER, cleanup);
179
180 TEST_PAUSE;
181
182 tst_tmpdir();
183
184 if ((cur_dir = getcwd(cur_dir, 0)) == NULL)
185 tst_brkm(TBROK | TERRNO, cleanup, "getcwd failed");
186
187 sprintf(good_dir, "%s/%d", cur_dir, getpid());
188 }
189
cleanup(void)190 void cleanup(void)
191 {
192 tst_rmdir();
193
194 }
195