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  * 	chroot01.c
23  *
24  * DESCRIPTION
25  *	Testcase to check the whether chroot sets errno to EPERM.
26  *
27  * ALGORITHM
28  *	As a non-root user attempt to perform chroot() to a directory. The
29  *	chroot() call should fail with EPERM
30  *
31  * USAGE:  <for command-line>
32  *  chroot01 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
33  *     where,  -c n : Run n copies concurrently.
34  *             -e   : Turn on errno logging.
35  *             -i n : Execute test n times.
36  *             -I x : Execute test for x seconds.
37  *             -P x : Pause for x seconds between iterations.
38  *             -t   : Turn on syscall timing.
39  *
40  * HISTORY
41  *	07/2001 Ported by Wayne Boyer
42  *
43  * RESTRICTIONS
44  * 	Must be run as non-root user.
45  */
46 
47 #include <stdio.h>
48 #include <errno.h>
49 #include "test.h"
50 #include "safe_macros.h"
51 #include <pwd.h>
52 
53 char *TCID = "chroot01";
54 int TST_TOTAL = 1;
55 int fail;
56 
57 #ifndef ANDROID
58 char path[] = "/tmp";
59 #else
60 char path[] = "/data/local/tmp";
61 #endif
62 
63 char nobody_uid[] = "nobody";
64 struct passwd *ltpuser;
65 
66 void setup(void);
67 void cleanup(void);
68 
69 int main(int ac, char **av)
70 {
71 	int lc;
72 
73 	tst_parse_opts(ac, av, NULL, NULL);
74 
75 	setup();
76 
77 	for (lc = 0; TEST_LOOPING(lc); lc++) {
78 
79 		tst_count = 0;
80 
81 		TEST(chroot(path));
82 
83 		if (TEST_RETURN != -1)
84 			tst_resm(TFAIL, "call succeeded unexpectedly");
85 		else if (errno != EPERM)
86 			tst_resm(TFAIL | TTERRNO, "chroot failed unexpectedly");
87 		else
88 			tst_resm(TPASS, "chroot set errno to EPERM.");
89 	}
90 	cleanup();
91 
92 	tst_exit();
93 
94 }
95 
96 void setup(void)
97 {
98 	tst_require_root();
99 
100 	tst_tmpdir();
101 
102 	if ((ltpuser = getpwnam(nobody_uid)) == NULL)
103 		tst_brkm(TBROK | TERRNO, cleanup,
104 			 "getpwnam(\"nobody\") failed");
105 
106 	SAFE_SETEUID(cleanup, ltpuser->pw_uid);
107 
108 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
109 
110 	TEST_PAUSE;
111 }
112 
113 void cleanup(void)
114 {
115 	SAFE_SETEUID(NULL, 0);
116 
117 	tst_rmdir();
118 }
119