1 /*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * Copyright (c) 2012, Cyril Hrubis <chrubis@suse.cz>
4 *
5 * This file is licensed under the GPL license. For the full content
6 * of this license, see the COPYING file at the top level of this
7 * source tree.
8 *
9 * The file descriptor fildes shall have been opened with read permission,
10 * regardless of the protection options specified. If PROT_WRITE is
11 * specified, the application shall ensure that it has opened the file
12 * descriptor fildes with write permission unless MAP_PRIVATE
13 * is specified in the flags parameter as described below.
14 *
15 * Test Steps:
16 * 1 Open a file RDONLY permition.
17 * 2. Mmap the file to a memory region setting prot as PROT_WRITE.
18 * 3. Setting flag as MAP_SHARED.
19 * 4. Get EACCES error when mmap().
20 *
21 */
22 #define _XOPEN_SOURCE 600
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <sys/mman.h>
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #include <sys/wait.h>
30 #include <fcntl.h>
31 #include <string.h>
32 #include <errno.h>
33 #include "posixtest.h"
34
main(void)35 int main(void)
36 {
37 char tmpfname[256];
38 void *pa;
39 size_t size = 1024;
40 int fd;
41
42 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_4_%d", getpid());
43
44 /* Create a tmp file */
45 unlink(tmpfname);
46 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
47 if (fd == -1) {
48 printf("Error at open(): %s\n", strerror(errno));
49 return PTS_UNRESOLVED;
50 }
51 if (ftruncate(fd, size) == -1) {
52 printf("Error at ftruncate(): %s\n", strerror(errno));
53 return PTS_UNRESOLVED;
54 }
55 close(fd);
56
57 /* Open as read only */
58 fd = open(tmpfname, O_RDONLY, S_IRUSR | S_IWUSR);
59 if (fd == -1) {
60 printf("Error at 2nd open(): %s\n", strerror(errno));
61 return PTS_UNRESOLVED;
62 }
63 unlink(tmpfname);
64
65 pa = mmap(NULL, size, PROT_WRITE, MAP_SHARED, fd, 0);
66 if (pa == MAP_FAILED && errno == EACCES) {
67 printf("EACCES on attempt to map readonly file as "
68 "PROT_WRITE, MAP_SHARED\n" "Test PASSED\n");
69 return PTS_PASS;
70 }
71
72 printf("Maping readonly file with PROT_WRITE, MAP_SHARED have not "
73 "returned EACCES\n" "Test FAILED\n");
74 return PTS_FAIL;
75 }
76