1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported to LTP: Wayne Boyer
5 */
6
7 /*
8 * DESCRIPTION
9 * Testcase to check creat(2) sets the following errnos correctly:
10 * 1. EISDIR
11 * 2. ENAMETOOLONG
12 * 3. ENOENT
13 * 4. ENOTDIR
14 * 5. EFAULT
15 * 6. EACCES
16 * 7. ELOOP
17 * 8. EROFS
18 *
19 *
20 * ALGORITHM
21 * 1. Attempt to creat(2) an existing directory, and test for
22 * EISDIR
23 * 2. Attempt to creat(2) a file whose name is more than
24 * VFS_MAXNAMLEN and test for ENAMETOOLONG.
25 * 3. Attempt to creat(2) a file inside a directory which doesn't
26 * exist, and test for ENOENT
27 * 4. Attempt to creat(2) a file, the pathname of which comprises
28 * a component which is a file, test for ENOTDIR.
29 * 5. Attempt to creat(2) a file with a bad address
30 * and test for EFAULT
31 * 6. Attempt to creat(2) a file in a directory with no
32 * execute permission and test for EACCES
33 * 7. Attempt to creat(2) a file which links the other file that
34 * links the former and test for ELOOP
35 * 8. Attempt to creat(2) a file in a Read-only file system
36 * and test for EROFS
37 */
38
39 #include <errno.h>
40 #include <string.h>
41 #include <limits.h>
42 #include <pwd.h>
43 #include <sys/mman.h>
44 #include <sys/types.h>
45 #include <sys/stat.h>
46 #include <sys/mount.h>
47
48 #include "tst_test.h"
49
50 #define TEST_FILE "test_dir"
51 #define NO_DIR "testfile/testdir"
52 #define NOT_DIR "file1/testdir"
53 #define TEST6_FILE "dir6/file6"
54 #define TEST7_FILE "file7"
55 #define TEST8_FILE "mntpoint/tmp"
56
57 #define MODE1 0444
58 #define MODE2 0666
59
60 static void setup(void);
61 static void test6_setup(void);
62 static void test6_cleanup(void);
63 static void bad_addr_setup(int);
64
65 static struct passwd *ltpuser;
66 static char long_name[PATH_MAX+2];
67
68 static struct test_case_t {
69 char *fname;
70 int mode;
71 int error;
72 void (*setup)();
73 void (*cleanup)(void);
74 } tcases[] = {
75 {TEST_FILE, MODE1, EISDIR, NULL, NULL},
76 {long_name, MODE1, ENAMETOOLONG, NULL, NULL},
77 {NO_DIR, MODE1, ENOENT, NULL, NULL},
78 {NOT_DIR, MODE1, ENOTDIR, NULL, NULL},
79 {NULL, MODE1, EFAULT, bad_addr_setup, NULL},
80 {TEST6_FILE, MODE1, EACCES, test6_setup, test6_cleanup},
81 {TEST7_FILE, MODE1, ELOOP, NULL, NULL},
82 {TEST8_FILE, MODE1, EROFS, NULL, NULL},
83 };
84
verify_creat(unsigned int i)85 static void verify_creat(unsigned int i)
86 {
87 if (tcases[i].setup != NULL)
88 tcases[i].setup(i);
89
90 TEST(creat(tcases[i].fname, tcases[i].mode));
91
92 if (tcases[i].cleanup != NULL)
93 tcases[i].cleanup();
94
95 if (TST_RET != -1) {
96 tst_res(TFAIL, "call succeeded unexpectedly");
97 return;
98 }
99
100 if (TST_ERR == tcases[i].error) {
101 tst_res(TPASS | TTERRNO, "got expected failure");
102 return;
103 }
104
105 tst_res(TFAIL | TTERRNO, "expected %s",
106 tst_strerrno(tcases[i].error));
107 }
108
109
setup(void)110 static void setup(void)
111 {
112 ltpuser = SAFE_GETPWNAM("nobody");
113
114 SAFE_MKDIR(TEST_FILE, MODE2);
115
116 memset(long_name, 'a', PATH_MAX+1);
117
118 SAFE_TOUCH("file1", MODE1, NULL);
119
120 SAFE_MKDIR("dir6", MODE2);
121
122 SAFE_SYMLINK(TEST7_FILE, "test_file_eloop2");
123 SAFE_SYMLINK("test_file_eloop2", TEST7_FILE);
124 }
125
bad_addr_setup(int i)126 static void bad_addr_setup(int i)
127 {
128 if (tcases[i].fname)
129 return;
130
131 tcases[i].fname = SAFE_MMAP(0, 1, PROT_NONE,
132 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
133 }
134
test6_setup(void)135 static void test6_setup(void)
136 {
137 SAFE_SETEUID(ltpuser->pw_uid);
138 }
139
test6_cleanup(void)140 static void test6_cleanup(void)
141 {
142 SAFE_SETEUID(0);
143 }
144
145 static struct tst_test test = {
146 .tcnt = ARRAY_SIZE(tcases),
147 .test = verify_creat,
148 .needs_root = 1,
149 .needs_rofs = 1,
150 .mntpoint = "mntpoint",
151 .setup = setup,
152 };
153