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 #if !defined(UCLINUX)
64 static void bad_addr_setup(int);
65 #endif
66
67 static struct passwd *ltpuser;
68 static char long_name[PATH_MAX+2];
69
70 static struct test_case_t {
71 char *fname;
72 int mode;
73 int error;
74 void (*setup)();
75 void (*cleanup)(void);
76 } tcases[] = {
77 {TEST_FILE, MODE1, EISDIR, NULL, NULL},
78 {long_name, MODE1, ENAMETOOLONG, NULL, NULL},
79 {NO_DIR, MODE1, ENOENT, NULL, NULL},
80 {NOT_DIR, MODE1, ENOTDIR, NULL, NULL},
81 #if !defined(UCLINUX)
82 {NULL, MODE1, EFAULT, bad_addr_setup, NULL},
83 #endif
84 {TEST6_FILE, MODE1, EACCES, test6_setup, test6_cleanup},
85 {TEST7_FILE, MODE1, ELOOP, NULL, NULL},
86 {TEST8_FILE, MODE1, EROFS, NULL, NULL},
87 };
88
verify_creat(unsigned int i)89 static void verify_creat(unsigned int i)
90 {
91 if (tcases[i].setup != NULL)
92 tcases[i].setup(i);
93
94 TEST(creat(tcases[i].fname, tcases[i].mode));
95
96 if (tcases[i].cleanup != NULL)
97 tcases[i].cleanup();
98
99 if (TST_RET != -1) {
100 tst_res(TFAIL, "call succeeded unexpectedly");
101 return;
102 }
103
104 if (TST_ERR == tcases[i].error) {
105 tst_res(TPASS | TTERRNO, "got expected failure");
106 return;
107 }
108
109 tst_res(TFAIL | TTERRNO, "expected %s",
110 tst_strerrno(tcases[i].error));
111 }
112
113
setup(void)114 static void setup(void)
115 {
116 ltpuser = SAFE_GETPWNAM("nobody");
117
118 SAFE_MKDIR(TEST_FILE, MODE2);
119
120 memset(long_name, 'a', PATH_MAX+1);
121
122 SAFE_TOUCH("file1", MODE1, NULL);
123
124 SAFE_MKDIR("dir6", MODE2);
125
126 SAFE_SYMLINK(TEST7_FILE, "test_file_eloop2");
127 SAFE_SYMLINK("test_file_eloop2", TEST7_FILE);
128 }
129
130 #if !defined(UCLINUX)
bad_addr_setup(int i)131 static void bad_addr_setup(int i)
132 {
133 if (tcases[i].fname)
134 return;
135
136 tcases[i].fname = SAFE_MMAP(0, 1, PROT_NONE,
137 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
138 }
139 #endif
140
test6_setup(void)141 static void test6_setup(void)
142 {
143 SAFE_SETEUID(ltpuser->pw_uid);
144 }
145
test6_cleanup(void)146 static void test6_cleanup(void)
147 {
148 SAFE_SETEUID(0);
149 }
150
151 static struct tst_test test = {
152 .tcnt = ARRAY_SIZE(tcases),
153 .test = verify_creat,
154 .needs_root = 1,
155 .needs_rofs = 1,
156 .mntpoint = "mntpoint",
157 .setup = setup,
158 };
159