1 /*
2 * Copyright (c) International Business Machines Corp., 2001
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
12 * the 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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /*
20 * Test Description:
21 * Call mmap() to map a file creating a mapped region with read access
22 * under the following conditions -
23 * - The prot parameter is set to PROT_WRITE
24 * - The file descriptor is open for writing.
25 * - The flags parameter has MAP_PRIVATE set.
26 *
27 * The call should fail to map the file.
28 *
29 * Expected Result:
30 * mmap() should fail returning -1 and errno should get set to EACCES.
31 *
32 * HISTORY
33 * 07/2001 Ported by Wayne Boyer
34 */
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <sys/types.h>
38 #include <errno.h>
39 #include <unistd.h>
40 #include <fcntl.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <sys/stat.h>
44 #include <sys/mman.h>
45
46 #include "test.h"
47
48 #define TEMPFILE "mmapfile"
49
50 char *TCID = "mmap07";
51 int TST_TOTAL = 1;
52
53 static size_t page_sz;
54 static char *addr;
55 static int fildes;
56
57 static void setup(void);
58 static void cleanup(void);
59
main(int ac,char ** av)60 int main(int ac, char **av)
61 {
62 int lc;
63
64 tst_parse_opts(ac, av, NULL, NULL);
65
66 setup();
67
68 for (lc = 0; TEST_LOOPING(lc); lc++) {
69
70 tst_count = 0;
71
72 /*
73 * Call mmap to map the temporary file 'TEMPFILE'
74 * with write access.
75 */
76 errno = 0;
77 addr = mmap(0, page_sz, PROT_WRITE,
78 MAP_FILE | MAP_PRIVATE, fildes, 0);
79 TEST_ERRNO = errno;
80
81 /* Check for the return value of mmap() */
82 if (addr != MAP_FAILED) {
83 tst_resm(TFAIL | TERRNO,
84 "mmap() returned invalid value, expected: %p",
85 MAP_FAILED);
86 /* Unmap the mapped memory */
87 if (munmap(addr, page_sz) != 0) {
88 tst_resm(TBROK, "munmap() failed");
89 cleanup();
90 }
91 continue;
92 }
93 if (TEST_ERRNO == EACCES) {
94 tst_resm(TPASS, "mmap failed with EACCES");
95 } else {
96 tst_resm(TFAIL | TERRNO,
97 "mmap failed with unexpected errno");
98 }
99
100 }
101 cleanup();
102 tst_exit();
103
104 }
105
setup(void)106 static void setup(void)
107 {
108 char *tst_buff;
109
110 tst_sig(NOFORK, DEF_HANDLER, cleanup);
111
112 TEST_PAUSE;
113
114 page_sz = getpagesize();
115
116 /* Allocate space for the test buffer */
117 if ((tst_buff = calloc(page_sz, sizeof(char))) == NULL) {
118 tst_brkm(TFAIL, NULL,
119 "calloc() failed to allocate space for tst_buff");
120 }
121
122 /* Fill the test buffer with the known data */
123 memset(tst_buff, 'A', page_sz);
124
125 tst_tmpdir();
126
127 /* Creat a temporary file used for mapping */
128 if ((fildes = open(TEMPFILE, O_WRONLY | O_CREAT, 0666)) < 0) {
129 free(tst_buff);
130 tst_brkm(TFAIL, cleanup, "open() on %s failed", TEMPFILE);
131 }
132
133 /* Write test buffer contents into temporary file */
134 if (write(fildes, tst_buff, page_sz) < page_sz) {
135 free(tst_buff);
136 tst_brkm(TFAIL, cleanup, "writing to %s failed", TEMPFILE);
137 }
138
139 free(tst_buff);
140 }
141
cleanup(void)142 static void cleanup(void)
143 {
144 close(fildes);
145 tst_rmdir();
146 }
147