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: nice04
22 *
23 * Test Description:
24 * Verify that, nice(2) fails when, a non-root user attempts to increase
25 * the priority of a process by specifying a negative increment value.
26 *
27 * Expected Result:
28 * nice() returns -1 and sets errno to EPERM.
29 *
30 * Algorithm:
31 * Setup:
32 * Setup signal handling.
33 * Pause for SIGUSR1 if option specified.
34 *
35 * Test:
36 * Loop if the proper options are given.
37 * Execute system call
38 * Check return code, if system call failed (return=-1)
39 * if errno set == expected errno
40 * PASS
41 * Issue sys call fails with expected return value and errno.
42 * Otherwise,
43 * FAIL
44 * Issue sys call fails with unexpected errno.
45 * Otherwise,
46 * Issue sys call returns unexpected value.
47 *
48 * Cleanup:
49 * Print errno log and/or timing stats if options given
50 *
51 * Usage: <for command-line>
52 * nice04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
53 * where, -c n : Run n copies concurrently.
54 * -e : Turn on errno logging.
55 * -i n : Execute test n times.
56 * -I x : Execute test for x seconds.
57 * -P x : Pause for x seconds between iterations.
58 * -t : Turn on syscall timing.
59 *
60 * HISTORY
61 * 07/2001 Ported by Wayne Boyer
62 *
63 * RESTRICTIONS:
64 * This test should be executed by 'non-super-user' only.
65 */
66 #include <pwd.h>
67 #include <unistd.h>
68 #include <errno.h>
69
70 #include "test.h"
71
72 char *TCID = "nice04";
73 int TST_TOTAL = 1;
74
75 char nobody_uid[] = "nobody";
76 struct passwd *ltpuser;
77
78 struct test_case_t { /* test case struct. to hold ref. test cond's */
79 int nice_val;
80 char *desc;
81 int exp_errno;
82 } Test_cases[] = {
83 {
84 -5, "Non-root cannot specify higher priority", EPERM}
85 };
86
87 void setup(); /* Main setup function of test */
88 void cleanup(); /* cleanup function for the test */
89
main(int ac,char ** av)90 int main(int ac, char **av)
91 {
92 int lc;
93 int i;
94 int incr_val; /* nice value for the process */
95 char *test_desc; /* test specific error message */
96
97 tst_parse_opts(ac, av, NULL, NULL);
98
99 setup();
100
101 for (lc = 0; TEST_LOOPING(lc); lc++) {
102
103 tst_count = 0;
104
105 for (i = 0; i < TST_TOTAL; i++) {
106 incr_val = Test_cases[i].nice_val;
107 test_desc = Test_cases[i].desc;
108
109 /*
110 * Call nice(2) with different 'incr' parameter
111 * values and verify that it fails as expected.
112 */
113 TEST(nice(incr_val));
114
115 /* check return code from nice(2) */
116 if (TEST_RETURN == -1) {
117 tst_resm(TPASS, "nice(2) returned %ld for %s",
118 TEST_RETURN, test_desc);
119 } else {
120 tst_resm(TFAIL | TTERRNO,
121 "nice() returned %ld for %s",
122 TEST_RETURN, test_desc);
123 }
124 }
125 }
126
127 cleanup();
128 tst_exit();
129
130 }
131
132 /*
133 * setup() - performs all ONE TIME setup for this test.
134 * Make sure the test process uid is non-root only.
135 */
setup(void)136 void setup(void)
137 {
138 tst_require_root();
139
140 tst_sig(NOFORK, DEF_HANDLER, cleanup);
141
142 /* Switch to nobody user for correct error code collection */
143 ltpuser = getpwnam(nobody_uid);
144 if (setuid(ltpuser->pw_uid) == -1) {
145 tst_resm(TINFO, "setuid failed to "
146 "to set the effective uid to %d", ltpuser->pw_uid);
147 perror("setuid");
148 }
149
150 TEST_PAUSE;
151 }
152
153 /*
154 * cleanup() - performs all ONE TIME cleanup for this test at
155 * completion or premature exit.
156 */
cleanup(void)157 void cleanup(void)
158 {
159
160 }
161