1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2013 Wanlong Gao <[email protected]>
4 * Copyright (c) 2018 Linux Test Project
5 */
6
7 /*\
8 * [Description]
9 *
10 * Verify that open() fails with:
11 *
12 * - EEXIST when pathname already exists and O_CREAT and O_EXCL were used
13 * - EISDIR when pathname refers to a directory and the access requested
14 * involved writing
15 * - ENOTDIR when O_DIRECTORY was specified and pathname was not a directory
16 * - ENAMETOOLONG when pathname was too long
17 * - EACCES when requested access to the file is not allowed
18 * - EFAULT when pathname points outside the accessible address space
19 */
20
21 #define _GNU_SOURCE /* for O_DIRECTORY */
22
23 #include <pwd.h>
24 #include "tst_test.h"
25
26 #define FLAGS_DESC(x) .flags = x, .desc = #x
27
28 static char *existing_fname = "open08_testfile";
29 static char *toolong_fname = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyz";
30 static char *dir_fname = "/tmp";
31 static char *user2_fname = "user2_0600";
32 static char *unmapped_fname;
33
34 struct test_case_t;
35
36 static struct test_case_t {
37 char **fname;
38 int flags;
39 const char *desc;
40 int error;
41 } tcases[] = {
42 {&existing_fname, FLAGS_DESC(O_CREAT | O_EXCL), EEXIST},
43 {&dir_fname, FLAGS_DESC(O_RDWR), EISDIR},
44 {&existing_fname, FLAGS_DESC(O_DIRECTORY), ENOTDIR},
45 {&toolong_fname, FLAGS_DESC(O_RDWR), ENAMETOOLONG},
46 {&user2_fname, FLAGS_DESC(O_WRONLY), EACCES},
47 {&unmapped_fname, FLAGS_DESC(O_CREAT), EFAULT},
48 };
49
verify_open(unsigned int i)50 static void verify_open(unsigned int i)
51 {
52 TST_EXP_FAIL2(open(*tcases[i].fname, tcases[i].flags, 0644),
53 tcases[i].error, "%s", tcases[i].desc);
54 }
55
setup(void)56 static void setup(void)
57 {
58 int fildes;
59 char nobody_uid[] = "nobody";
60 struct passwd *ltpuser;
61
62 umask(0);
63
64 SAFE_CREAT(user2_fname, 0600);
65
66 /* Switch to nobody user for correct error code collection */
67 ltpuser = getpwnam(nobody_uid);
68 SAFE_SETGID(ltpuser->pw_gid);
69 SAFE_SETUID(ltpuser->pw_uid);
70
71 fildes = SAFE_CREAT(existing_fname, 0600);
72 SAFE_CLOSE(fildes);
73
74 unmapped_fname = tst_get_bad_addr(NULL);
75 }
76
77 static struct tst_test test = {
78 .tcnt = ARRAY_SIZE(tcases),
79 .needs_tmpdir = 1,
80 .needs_root = 1,
81 .setup = setup,
82 .test = verify_open,
83 };
84