1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*-
* Copyright (c) 2009 Simon L. Nielsen <simon@FreeBSD.org>,
* Bjoern A. Zeeb <bz@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <stdio.h>
#include <err.h>
const struct tests {
void *addr;
int ok[2]; /* Depending on security.bsd.map_at_zero {0, !=0}. */
} tests[] = {
{ (void *)0, { 0, 1 } }, /* Test sysctl. */
{ (void *)1, { 0, 0 } },
{ (void *)(PAGE_SIZE - 1), { 0, 0 } },
{ (void *)PAGE_SIZE, { 1, 1 } },
{ (void *)-1, { 0, 0 } },
{ (void *)(-PAGE_SIZE), { 0, 0 } },
{ (void *)(-1 - PAGE_SIZE), { 0, 0 } },
{ (void *)(-1 - PAGE_SIZE - 1), { 0, 0 } },
{ (void *)(0x1000 * PAGE_SIZE), { 1, 1 } },
};
int
main(void)
{
void *p;
size_t len;
int i, error, mib[3], map_at_zero;
error = 0;
/* Get the current sysctl value of security.bsd.map_at_zero. */
len = sizeof(mib) / sizeof(*mib);
if (sysctlnametomib("security.bsd.map_at_zero", mib, &len) == -1)
err(1, "sysctlnametomib(security.bsd.map_at_zero)");
len = sizeof(map_at_zero);
if (sysctl(mib, 3, &map_at_zero, &len, NULL, 0) == -1)
err(1, "sysctl(security.bsd.map_at_zero)");
/* Normalize to 0 or 1 for array access. */
map_at_zero = !!map_at_zero;
for (i=0; i < (sizeof(tests) / sizeof(*tests)); i++) {
p = mmap((void *)tests[i].addr, PAGE_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_FIXED,
-1, 0);
if (p == MAP_FAILED) {
if (tests[i].ok[map_at_zero] != 0)
error++;
warnx("%s: mmap(%p, ...) failed.",
(tests[i].ok[map_at_zero] == 0) ? "OK " : "ERR",
tests[i].addr);
} else {
if (tests[i].ok[map_at_zero] != 1)
error++;
warnx("%s: mmap(%p, ...) succeeded: p=%p",
(tests[i].ok[map_at_zero] == 1) ? "OK " : "ERR",
tests[i].addr, p);
}
}
if (error)
err(1, "---\nERROR: %d unexpected results.", error);
return (error != 0);
}
|
