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 * DESCRIPTION
22 *	Testcase to check open(2) sets errno to EACCES correctly.
23 *
24 * ALGORITHM
25 *	Create a file owned by root with no read permission for other users.
26 *	Attempt to open it as ltpuser(1). The attempt should fail with EACCES.
27 * RESTRICTION
28 *	Must run test as root.
29 */
30#include <errno.h>
31#include <pwd.h>
32#include <fcntl.h>
33#include <sys/stat.h>
34#include <sys/types.h>
35#include <sys/wait.h>
36
37#include "test.h"
38#include "safe_macros.h"
39
40char *TCID = "open05";
41int TST_TOTAL = 1;
42
43static char fname[20];
44static int fd;
45
46static uid_t nobody_uid;
47
48static void cleanup(void);
49static void setup(void);
50
51int main(int ac, char **av)
52{
53	int lc;
54	int e_code, status, retval = 0;
55	pid_t pid;
56
57	tst_parse_opts(ac, av, NULL, NULL);
58
59	setup();
60
61	for (lc = 0; TEST_LOOPING(lc); lc++) {
62		/* reset tst_count in case we are looping */
63		tst_count = 0;
64
65		pid = FORK_OR_VFORK();
66		if (pid == -1)
67			tst_brkm(TBROK, cleanup, "fork() failed");
68
69		if (pid == 0) {
70			if (seteuid(nobody_uid) == -1) {
71				tst_resm(TWARN, "seteuid() failed, errno: %d",
72					 errno);
73			}
74
75			TEST(open(fname, O_RDWR));
76
77			if (TEST_RETURN != -1) {
78				tst_resm(TFAIL, "open succeeded unexpectedly");
79				continue;
80			}
81
82			if (TEST_ERRNO != EACCES) {
83				retval = 1;
84				tst_resm(TFAIL, "Expected EACCES got %d",
85					 TEST_ERRNO);
86			} else {
87				tst_resm(TPASS, "open returned expected "
88					 "EACCES error");
89			}
90
91			/* set the id back to root */
92			if (seteuid(0) == -1)
93				tst_resm(TWARN, "seteuid(0) failed");
94
95			exit(retval);
96
97		} else {
98			/* wait for the child to finish */
99			wait(&status);
100			/* make sure the child returned a good exit status */
101			e_code = status >> 8;
102			if ((e_code != 0) || (retval != 0))
103				tst_resm(TFAIL, "Failures reported above");
104
105			close(fd);
106			cleanup();
107
108		}
109	}
110
111	tst_exit();
112}
113
114static void setup(void)
115{
116	struct passwd *pw;
117
118	tst_require_root();
119
120	pw = SAFE_GETPWNAM(NULL, "nobody");
121	nobody_uid = pw->pw_uid;
122
123	tst_sig(FORK, DEF_HANDLER, cleanup);
124
125	TEST_PAUSE;
126
127	/* make a temporary directory and cd to it */
128	tst_tmpdir();
129
130	sprintf(fname, "file.%d", getpid());
131
132	fd = open(fname, O_RDWR | O_CREAT, 0700);
133	if (fd == -1)
134		tst_brkm(TBROK, cleanup, "open() failed, errno: %d", errno);
135}
136
137static void cleanup(void)
138{
139	unlink(fname);
140
141	/* delete the test directory created in setup() */
142	tst_rmdir();
143}
144