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_READ
24 * - The file descriptor is open for writing.
25 *
26 * The call should fail to map the file.
27 *
28 * Expected Result:
29 * mmap() should fail returning -1 and errno should get set to EACCES.
30 *
31 * HISTORY
32 * 07/2001 Ported by Wayne Boyer
33 */
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <sys/types.h>
37 #include <errno.h>
38 #include <unistd.h>
39 #include <fcntl.h>
40 #include <string.h>
41 #include <signal.h>
42 #include <sys/stat.h>
43 #include <sys/mman.h>
44
45 #include "test.h"
46
47 #define TEMPFILE "mmapfile"
48
49 char *TCID = "mmap06";
50 int TST_TOTAL = 1;
51
52 static size_t page_sz;
53 static char *addr;
54 static int fildes;
55
56 static void setup(void);
57 static void cleanup(void);
58
main(int ac,char ** av)59 int main(int ac, char **av)
60 {
61 int lc;
62
63 tst_parse_opts(ac, av, NULL, NULL);
64
65 setup();
66
67 for (lc = 0; TEST_LOOPING(lc); lc++) {
68
69 tst_count = 0;
70
71 /*
72 * Call mmap to map the temporary file 'TEMPFILE'
73 * with read access.
74 */
75 errno = 0;
76 addr = mmap(0, page_sz, PROT_READ,
77 MAP_FILE | MAP_SHARED, fildes, 0);
78 TEST_ERRNO = errno;
79
80 /* Check for the return value of mmap() */
81 if (addr != MAP_FAILED) {
82 tst_resm(TFAIL | TERRNO,
83 "mmap() returned invalid value, expected: %p",
84 MAP_FAILED);
85 /* Unmap the mapped memory */
86 if (munmap(addr, page_sz) != 0) {
87 tst_resm(TBROK, "munmap() failed");
88 cleanup();
89 }
90 continue;
91 }
92 if (TEST_ERRNO == EACCES) {
93 tst_resm(TPASS, "mmap failed with EACCES");
94 } else {
95 tst_resm(TFAIL | TERRNO,
96 "mmap failed with unexpected errno");
97 }
98 }
99 cleanup();
100 tst_exit();
101
102 }
103
setup(void)104 static void setup(void)
105 {
106 char *tst_buff;
107
108 tst_sig(NOFORK, DEF_HANDLER, cleanup);
109
110 TEST_PAUSE;
111
112 page_sz = getpagesize();
113
114 /* Allocate space for the test buffer */
115 if ((tst_buff = calloc(page_sz, sizeof(char))) == NULL) {
116 tst_brkm(TFAIL, NULL, "calloc() failed (tst_buff)");
117 }
118
119 /* Fill the test buffer with the known data */
120 memset(tst_buff, 'A', page_sz);
121
122 tst_tmpdir();
123
124 /* Creat a temporary file used for mapping */
125 if ((fildes = open(TEMPFILE, O_WRONLY | O_CREAT, 0666)) < 0) {
126 free(tst_buff);
127 tst_brkm(TFAIL, cleanup, "opening %s failed", TEMPFILE);
128 }
129
130 /* Write test buffer contents into temporary file */
131 if (write(fildes, tst_buff, page_sz) < page_sz) {
132 free(tst_buff);
133 tst_brkm(TFAIL, cleanup, "writing to %s failed", TEMPFILE);
134 }
135
136 free(tst_buff);
137 }
138
cleanup(void)139 static void cleanup(void)
140 {
141 close(fildes);
142 tst_rmdir();
143 }
144