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
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2014-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/mman.h>
#include <unistd.h>
#include <assert.h>
void
breakpt (void)
{
/* Nothing. */
}
void
func5 (void)
{
breakpt ();
}
void
func4 (void)
{
func5 ();
}
void
func3 (void)
{
func4 ();
}
void
func2 (void *ptr)
{
func3 ();
}
void
func1 (void *ptr)
{
func2 (ptr);
}
/* Finds and returns an invalid pointer, mmaps in a page, grabs a pointer
to it then unmaps the page again. This is almost certainly "undefined"
behaviour, but should be good enough for this small test program. */
static void *
make_invalid_ptr (void)
{
int page_size, ans;
void *ptr;
page_size = getpagesize ();
ptr = mmap (0, page_size, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
assert (ptr != MAP_FAILED);
ans = munmap (ptr, page_size);
assert (ans == 0);
return ptr;
}
int
main (void)
{
void *invalid_ptr;
invalid_ptr = make_invalid_ptr ();
func1 (invalid_ptr);
return 0;
}
|
