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
|
/*
* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*/
#include <common.h>
#include <chromeos/common.h>
#include <chromeos/memory_wipe.h>
#include <vboot_api.h>
#define PREFIX "memory_wipe: "
void memory_wipe_init(memory_wipe_t *wipe, uintptr_t start, uintptr_t end)
{
wipe->whole.start = start;
wipe->whole.end = end;
wipe->excluded_count = 0;
}
int memory_wipe_exclude(memory_wipe_t *wipe, uintptr_t start, uintptr_t end)
{
int i = wipe->excluded_count;
if (i >= MAX_EXCLUDED_REGIONS) {
VBDEBUG(PREFIX "the number of excluded regions reaches"
"the maximum: %d\n", MAX_EXCLUDED_REGIONS);
return -1;
}
while (i > 0 && wipe->excluded[i - 1].start > start) {
wipe->excluded[i].start = wipe->excluded[i - 1].start;
wipe->excluded[i].end = wipe->excluded[i - 1].end;
i--;
}
wipe->excluded[i].start = start;
wipe->excluded[i].end = end;
wipe->excluded_count++;
return 0;
}
static void zero_mem(uintptr_t start, uintptr_t end)
{
if (end > start) {
VBDEBUG(PREFIX "\t[0x%08x, 0x%08x)\n", start, end);
memset((void *)start, '\0', (size_t)(end - start));
}
}
void memory_wipe_execute(memory_wipe_t *wipe)
{
uintptr_t addr = wipe->whole.start;
int i;
VBDEBUG(PREFIX "Wipe memory regions:\n");
for (i = 0; i < wipe->excluded_count; i++) {
zero_mem(addr, wipe->excluded[i].start);
if (wipe->excluded[i].end > addr)
addr = wipe->excluded[i].end;
}
zero_mem(addr, wipe->whole.end);
}
|
