1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Ported by John George
19 */
20
21 /*
22 * Test that root can change the real and effective uid to an
23 * unpriviledged user.
24 */
25
26 #include <errno.h>
27 #include <stdlib.h>
28 #include <pwd.h>
29 #include <sys/wait.h>
30
31 #include "test.h"
32 #include "compat_16.h"
33
34 TCID_DEFINE(setreuid04);
35
36 static uid_t neg_one = -1;
37
38 static struct passwd nobody, root;
39
40 /*
41 * The following structure contains all test data. Each structure in the array
42 * is used for a separate test. The tests are executed in the for loop below.
43 */
44
45 struct test_data_t {
46 uid_t *real_uid;
47 uid_t *eff_uid;
48 struct passwd *exp_real_usr;
49 struct passwd *exp_eff_usr;
50 char *test_msg;
51 } test_data[] = {
52 {
53 &neg_one, &neg_one, &root, &root, "After setreuid(-1, nobody),"}, {
54 &nobody.pw_uid, &nobody.pw_uid, &nobody, &nobody,
55 "After setreuid(-1, -1),"},};
56
57 int TST_TOTAL = ARRAY_SIZE(test_data);
58
59 static void setup(void);
60 static void cleanup(void);
61 static void uid_verify(struct passwd *, struct passwd *, char *);
62
main(int ac,char ** av)63 int main(int ac, char **av)
64 {
65 int lc;
66
67 tst_parse_opts(ac, av, NULL, NULL);
68
69 setup();
70
71 for (lc = 0; TEST_LOOPING(lc); lc++) {
72 int i, pid;
73
74 tst_count = 0;
75
76 if ((pid = FORK_OR_VFORK()) == -1) {
77 tst_brkm(TBROK, cleanup, "fork failed");
78 } else if (pid == 0) { /* child */
79
80 for (i = 0; i < TST_TOTAL; i++) {
81
82 /* Set the real or effective user id */
83 TEST(SETREUID(cleanup, *test_data[i].real_uid,
84 *test_data[i].eff_uid));
85
86 if (TEST_RETURN != -1) {
87 tst_resm(TPASS, "setreuid(%d, %d) "
88 "succeeded as expected.",
89 *test_data[i].real_uid,
90 *test_data[i].eff_uid);
91 } else {
92 tst_resm(TFAIL, "setreuid(%d, %d) "
93 "did not return as expected.",
94 *test_data[i].real_uid,
95 *test_data[i].eff_uid);
96 }
97
98 uid_verify(test_data[i].exp_real_usr,
99 test_data[i].exp_eff_usr,
100 test_data[i].test_msg);
101 }
102 tst_exit();
103 } else { /* parent */
104 tst_record_childstatus(cleanup, pid);
105 }
106 }
107 cleanup();
108 tst_exit();
109 }
110
setup(void)111 static void setup(void)
112 {
113 tst_require_root();
114
115 tst_sig(FORK, DEF_HANDLER, cleanup);
116
117 if (getpwnam("nobody") == NULL)
118 tst_brkm(TBROK, NULL, "nobody must be a valid user.");
119
120 root = *(getpwnam("root"));
121 UID16_CHECK(root.pw_uid, setreuid, cleanup);
122
123 nobody = *(getpwnam("nobody"));
124 UID16_CHECK(nobody.pw_uid, setreuid, cleanup);
125
126 TEST_PAUSE;
127 }
128
cleanup(void)129 static void cleanup(void)
130 {
131 }
132
uid_verify(struct passwd * ru,struct passwd * eu,char * when)133 static void uid_verify(struct passwd *ru, struct passwd *eu, char *when)
134 {
135 if ((getuid() != ru->pw_uid) || (geteuid() != eu->pw_uid)) {
136 tst_resm(TFAIL, "ERROR: %s real uid = %d; effective uid = %d",
137 when, getuid(), geteuid());
138 tst_resm(TINFO, "Expected: real uid = %d; effective uid = %d",
139 ru->pw_uid, eu->pw_uid);
140 }
141 }
142