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
97
98
99
100
101
102
103
104
105
106
107
|
/* Copyright (C) 1990-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Torbjorn Granlund (tege@sics.se).
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <malloc.h>
int
main (void)
{
char *mem, *memp;
char *rand_mem;
char *lo_around, *hi_around;
int size, max_size;
int src_off, dst_off;
int i;
int space_around = 10;
max_size = 256;
mem = malloc (max_size + 2 * max_size + 2 * space_around);
rand_mem = malloc (max_size);
lo_around = malloc (space_around);
hi_around = malloc (space_around);
memp = mem + space_around;
/* Fill RAND_MEM with random bytes, each non-zero. */
for (i = 0; i < max_size; i++)
{
int x;
do
x = random ();
while (x == 0);
rand_mem[i] = x;
}
for (size = 0; size < max_size; size++)
{
printf("phase %d\n", size);
for (src_off = 0; src_off <= 16; src_off++)
{
for (dst_off = 0; dst_off <= 16; dst_off++)
{
/* Put zero around the intended destination, to check
that it's not clobbered. */
for (i = 1; i < space_around; i++)
{
memp[dst_off - i] = 0;
memp[dst_off + size - 1 + i] = 0;
}
/* Fill the source area with known contents. */
for (i = 0; i < size; i++)
memp[src_off + i] = rand_mem[i];
/* Remember the contents around the destination area.
(It might not be what we wrote some lines above, since
the src area and the dst area overlap.) */
for (i = 1; i < space_around; i++)
{
lo_around[i] = memp[dst_off - i];
hi_around[i] = memp[dst_off + size - 1 + i];
}
memmove (memp + dst_off, memp + src_off, size);
/* Check that the destination area has the same
contents we wrote to the source area. */
for (i = 0; i < size; i++)
{
if (memp[dst_off + i] != rand_mem[i])
abort ();
}
/* Check that the area around the destination is not
clobbered. */
for (i = 1; i < space_around; i++)
{
if (memp[dst_off - i] != lo_around[i])
abort ();
if (memp[dst_off + size - 1 + i] != hi_around[i])
abort ();
}
}
}
}
puts ("Test succeeded.");
return 0;
}
|
