1/*
2 * Copyright (C) Bull S.A. 2001
3 * Copyright (c) International Business Machines  Corp., 2001
4 *  06/2002 Ported by Jacky Malcles
5 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
6 *
7 * This program is free software;  you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
15 * the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program;  if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/*
23 * Verify that, link() fails with -1 and sets errno to EACCES when one of the
24 * directories in oldpath or newpath did not allow search (execute) permission.
25 */
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <unistd.h>
30#include <fcntl.h>
31#include <errno.h>
32#include <string.h>
33#include <signal.h>
34#include <sys/types.h>
35#include <sys/stat.h>
36#include <pwd.h>
37
38#include "test.h"
39#include "safe_macros.h"
40
41#define MODE_TO S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IXOTH|S_IROTH|S_IWOTH
42#define MODE_TE S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH
43#define MODE_RWX        S_IRWXU | S_IRWXG | S_IRWXO
44#define DIR_TEMP        "testdir_1"
45#define TEST_FILE2      "testdir_1/tfile_2"
46#define NEW_TEST_FILE2  "testdir_1/new_tfile_2"
47
48static void setup(void);
49static void cleanup(void);
50
51char *TCID = "link07";
52int TST_TOTAL = 1;
53
54int main(int ac, char **av)
55{
56	int lc;
57
58	tst_parse_opts(ac, av, NULL, NULL);
59
60	setup();
61
62	for (lc = 0; TEST_LOOPING(lc); lc++) {
63		tst_count = 0;
64
65		TEST(link(TEST_FILE2, NEW_TEST_FILE2));
66
67		/* Check return code from link(2) */
68		if (TEST_RETURN != -1) {
69			tst_resm(TFAIL | TTERRNO, "link() returned %ld,"
70				 "expected -1, errno=%d", TEST_RETURN, EACCES);
71		} else {
72			if (TEST_ERRNO == EACCES) {
73				tst_resm(TPASS | TTERRNO,
74				         "link() fails with expected error");
75			} else {
76				tst_resm(TFAIL | TTERRNO, "link() failed"
77				         ", expected errno=%d (EACCES)",
78				         EACCES);
79			}
80		}
81	}
82
83	cleanup();
84	tst_exit();
85}
86
87static void setup(void)
88{
89	struct passwd *nobody_pwd;
90
91	tst_sig(NOFORK, DEF_HANDLER, cleanup);
92
93	tst_require_root();
94
95	TEST_PAUSE;
96
97	tst_tmpdir();
98
99	/* Modify mode permissions on test directory */
100	SAFE_CHMOD(cleanup, ".", MODE_TO);
101
102	SAFE_MKDIR(cleanup, DIR_TEMP, MODE_RWX);
103	SAFE_TOUCH(cleanup, TEST_FILE2, 0666, NULL);
104
105	/* Modify mode permissions on test directory - test conditions */
106	SAFE_CHMOD(cleanup, DIR_TEMP, MODE_TE);
107
108	nobody_pwd = SAFE_GETPWNAM(cleanup, "nobody");
109	SAFE_SETEUID(cleanup, nobody_pwd->pw_uid);
110}
111
112static void cleanup(void)
113{
114	if (seteuid(0))
115		tst_resm(TWARN | TERRNO, "seteuid(o) failed");
116
117	tst_rmdir();
118}
119