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 * If MAP_FIXED is set,
10 * mmap() may return MAP_FAILED and set errno to [EINVAL].
11 *
12 * [EINVAL] The addr argument (if MAP_FIXED was specified) or off is not a
13 * multiple of the page size as returned by sysconf(), or is considered invalid
14 * by the implementation.
15 *
16 * Test Steps:
17 * 1. Set 'addr' as an illegal address, which is not a multiple of page size;
18 * 2. Call mmap() and get EINVAL;
19 */
20
21 #define _XOPEN_SOURCE 600
22
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 long page_size;
39 long total_size;
40
41 void *illegal_addr;
42 void *pa;
43 size_t size;
44 int fd, saved_errno;
45
46 page_size = sysconf(_SC_PAGE_SIZE);
47 total_size = page_size;
48 size = total_size;
49
50 /* Create tmp file */
51 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_9_1_%d", getpid());
52 unlink(tmpfname);
53 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
54 if (fd == -1) {
55 printf("Error at open(): %s\n", strerror(errno));
56 return PTS_UNRESOLVED;
57 }
58 unlink(tmpfname);
59 if (ftruncate(fd, total_size) == -1) {
60 printf("Error at ftruncate(): %s\n", strerror(errno));
61 return PTS_UNRESOLVED;
62 }
63
64 /* Map the file for the first time, to get a legal address, pa */
65 pa = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
66
67 if ((unsigned long)pa % page_size) {
68 printf("pa is not multiple of page_size\n");
69 illegal_addr = pa;
70 } else {
71 printf("pa is a multiple of page_size\n");
72 illegal_addr = pa + 1;
73 }
74
75 munmap(pa, size);
76
77 /* Mmap again using the illegal address, setting MAP_FIXED */
78 pa = mmap(illegal_addr, size, PROT_READ | PROT_WRITE, MAP_FIXED, fd, 0);
79
80 saved_errno = errno;
81
82 close(fd);
83 munmap(pa, size);
84
85 if (pa == MAP_FAILED && saved_errno == EINVAL) {
86 printf("Test PASSED\n");
87 return PTS_PASS;
88 }
89
90 printf("Test FAILED, mmap with MAP_FIXED did not get EINVAL"
91 " when 'addr' is illegal\n");
92 return PTS_FAIL;
93 }
94