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 mmap() function shall fail if:
10 * [EOVERFLOW] The file is a regular file and the value of off
11 * plus len exceeds the offset maximum established in the open
12 * file description associated with fildes.
13 *
14 * Note: This error condition came to the standard with large
15 *       file extension and cannot be triggered without it.
16 *
17 *       So in order to trigger this we need 32 bit architecture
18 *       and largefile support turned on.
19 */
20
21#define _XOPEN_SOURCE 600
22
23/* Turn on large file support, has no effect on 64 bit archs */
24#define _FILE_OFFSET_BITS 64
25
26#include <stdio.h>
27#include <stdlib.h>
28#include <unistd.h>
29#include <limits.h>
30#include <sys/mman.h>
31#include <sys/types.h>
32#include <sys/stat.h>
33#include <sys/wait.h>
34#include <fcntl.h>
35#include <string.h>
36#include <errno.h>
37#include <sys/utsname.h>
38#include "posixtest.h"
39
40int main(void)
41{
42	char tmpfname[256];
43
44	void *pa;
45	size_t len;
46	int fd;
47	off_t off = 0;
48
49	/* check for 64 bit arch */
50	if (sizeof(void *) == 8) {
51		printf("USUPPORTED: Cannot be tested on 64 bit architecture\n");
52		return PTS_UNSUPPORTED;
53	}
54
55	/* The overflow does not happen when 32bit binary runs on 64bit kernel */
56#ifdef __linux__
57	struct utsname buf;
58
59	if (!uname(&buf) && strstr(buf.machine, "64")) {
60		printf("UNSUPPORTED: Looks like we run on 64bit kernel (%s)\n",
61		       buf.machine);
62		return PTS_UNSUPPORTED;
63	}
64
65#endif /* __linux__ */
66
67	long page_size = sysconf(_SC_PAGE_SIZE);
68
69	snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_31_1_%d", getpid());
70	unlink(tmpfname);
71	fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
72	if (fd == -1) {
73		printf("Error at open(): %s\n", strerror(errno));
74		return PTS_UNRESOLVED;
75	}
76	unlink(tmpfname);
77
78	/* Set lenght to maximal multiple of page size */
79	len = ~((size_t) 0) & (~(page_size - 1));
80
81	/*
82	 * Now we need offset that fits into 32 bit
83	 * value when divided by page size but is big
84	 * enough so that offset + PAGE_ALIGN(len) / page_size
85	 * overflows 32 bits.
86	 */
87	off = ((off_t) ~ ((size_t) 0)) * page_size;
88	off &= ~(page_size - 1);
89
90	printf("off: %llx, len: %llx\n", (unsigned long long)off,
91	       (unsigned long long)len);
92
93	pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, off);
94	if (pa == MAP_FAILED && errno == EOVERFLOW) {
95		printf("Got EOVERFLOW\n");
96		printf("Test PASSED\n");
97		return PTS_PASS;
98	}
99
100	if (pa == MAP_FAILED)
101		perror("Test FAILED: expect EOVERFLOW but get other error");
102	else
103		printf("Test FAILED: Expect EOVERFLOW but got no error\n");
104
105	close(fd);
106	munmap(pa, len);
107	return PTS_FAIL;
108}
109