1 /*
2 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
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 the
12 * 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, see <http://www.gnu.org/licenses/>.
16 */
17
18 /*
19 * Description:
20 * The testcase checks the various errnos of the unlink(2).
21 * 1) unlink() returns EACCES when deleting file in unwritable directory
22 * as an unprivileged user.
23 * 2) unlink() returns EACCES when deleting file in "unsearchable directory
24 * as an unprivileged user.
25 * 3) unlink() returns EISDIR when deleting directory for root
26 * 4) unlink() returns EISDIR when deleting directory for regular user
27 */
28
29 #include <errno.h>
30 #include <stdlib.h>
31 #include <sys/types.h>
32 #include <pwd.h>
33 #include "tst_test.h"
34
35 static struct passwd *pw;
36
37 static struct test_case_t {
38 char *name;
39 char *desc;
40 int exp_errno;
41 int exp_user;
42 } tcases[] = {
43 {"unwrite_dir/file", "unwritable directory", EACCES, 1},
44 {"unsearch_dir/file", "unsearchable directory", EACCES, 1},
45 {"regdir", "directory", EISDIR, 0},
46 {"regdir", "directory", EISDIR, 1},
47 };
48
verify_unlink(struct test_case_t * tc)49 static void verify_unlink(struct test_case_t *tc)
50 {
51 TEST(unlink(tc->name));
52 if (TST_RET != -1) {
53 tst_res(TFAIL, "unlink(<%s>) succeeded unexpectedly",
54 tc->desc);
55 return;
56 }
57
58 if (TST_ERR == tc->exp_errno) {
59 tst_res(TPASS | TTERRNO, "unlink(<%s>) failed as expected",
60 tc->desc);
61 } else {
62 tst_res(TFAIL | TTERRNO,
63 "unlink(<%s>) failed, expected errno: %s",
64 tc->desc, tst_strerrno(tc->exp_errno));
65 }
66 }
67
do_unlink(unsigned int n)68 static void do_unlink(unsigned int n)
69 {
70 struct test_case_t *cases = &tcases[n];
71 pid_t pid;
72
73 if (cases->exp_user) {
74 pid = SAFE_FORK();
75 if (!pid) {
76 SAFE_SETUID(pw->pw_uid);
77 verify_unlink(cases);
78 exit(0);
79 }
80
81 SAFE_WAITPID(pid, NULL, 0);
82 } else {
83 verify_unlink(cases);
84 }
85 }
86
setup(void)87 static void setup(void)
88 {
89 SAFE_MKDIR("unwrite_dir", 0777);
90 SAFE_TOUCH("unwrite_dir/file", 0777, NULL);
91 SAFE_CHMOD("unwrite_dir", 0555);
92
93 SAFE_MKDIR("unsearch_dir", 0777);
94 SAFE_TOUCH("unsearch_dir/file", 0777, NULL);
95 SAFE_CHMOD("unsearch_dir", 0666);
96
97 SAFE_MKDIR("regdir", 0777);
98
99 pw = SAFE_GETPWNAM("nobody");
100 }
101
102 static struct tst_test test = {
103 .needs_root = 1,
104 .forks_child = 1,
105 .needs_tmpdir = 1,
106 .setup = setup,
107 .tcnt = ARRAY_SIZE(tcases),
108 .test = do_unlink,
109 };
110