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
108
109
110
111
112
113
114
115
116
117
118
119
|
/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* GBB accessor functions.
*/
#include "2common.h"
#include "2misc.h"
static vb2_error_t vb2_gbb_read_key(struct vb2_context *ctx, uint32_t offset,
uint32_t *size,
struct vb2_packed_key **keyp,
struct vb2_workbuf *wb)
{
struct vb2_workbuf wblocal = *wb;
/* Check offset and size. */
if (offset < sizeof(struct vb2_gbb_header))
return VB2_ERROR_GBB_INVALID;
if (*size < sizeof(**keyp))
return VB2_ERROR_GBB_INVALID;
/* GBB header might be padded. Retrieve the vb2_packed_key
header so we can find out what the real size is. */
*keyp = vb2_workbuf_alloc(&wblocal, sizeof(**keyp));
if (!*keyp)
return VB2_ERROR_GBB_WORKBUF;
VB2_TRY(vb2ex_read_resource(ctx, VB2_RES_GBB, offset, *keyp,
sizeof(**keyp)));
VB2_TRY(vb2_verify_packed_key_inside(*keyp, *size, *keyp));
/* Deal with a zero-size key (used in testing). */
*size = (*keyp)->key_offset + (*keyp)->key_size;
*size = VB2_MAX(*size, sizeof(**keyp));
/* Now that we know the real size of the key, retrieve the key
data, and write it on the workbuf, directly after vb2_packed_key. */
*keyp = vb2_workbuf_realloc(&wblocal, sizeof(**keyp), *size);
if (!*keyp)
return VB2_ERROR_GBB_WORKBUF;
VB2_TRY(vb2ex_read_resource(ctx, VB2_RES_GBB,
offset + sizeof(**keyp),
(void *)*keyp + sizeof(**keyp),
*size - sizeof(**keyp)));
*wb = wblocal;
return VB2_SUCCESS;
}
test_mockable
vb2_error_t vb2_gbb_read_root_key(struct vb2_context *ctx,
struct vb2_packed_key **keyp, uint32_t *size,
struct vb2_workbuf *wb)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
uint32_t size_in = gbb->rootkey_size;
vb2_error_t ret = vb2_gbb_read_key(ctx, gbb->rootkey_offset,
&size_in, keyp, wb);
if (size)
*size = size_in;
return ret;
}
test_mockable
vb2_error_t vb2_gbb_read_recovery_key(struct vb2_context *ctx,
struct vb2_packed_key **keyp,
uint32_t *size, struct vb2_workbuf *wb)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
uint32_t size_in = gbb->recovery_key_size;
vb2_error_t ret = vb2_gbb_read_key(ctx, gbb->recovery_key_offset,
&size_in, keyp, wb);
if (size)
*size = size_in;
return ret;
}
vb2_error_t vb2api_gbb_read_hwid(struct vb2_context *ctx, char *hwid,
uint32_t *size)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
uint32_t i;
vb2_error_t ret;
if (gbb->hwid_size == 0) {
VB2_DEBUG("invalid HWID size %d\n", gbb->hwid_size);
return VB2_ERROR_GBB_INVALID;
}
*size = VB2_MIN(*size, VB2_GBB_HWID_MAX_SIZE);
*size = VB2_MIN(*size, gbb->hwid_size);
ret = vb2ex_read_resource(ctx, VB2_RES_GBB, gbb->hwid_offset,
hwid, *size);
if (ret) {
VB2_DEBUG("read resource failure: %d\n", ret);
return ret;
}
/* Count HWID size, and ensure that it fits in the given buffer. */
for (i = 0; i < *size; i++) {
if (hwid[i] == '\0') {
*size = i + 1;
break;
}
}
if (hwid[*size - 1] != '\0')
return VB2_ERROR_INVALID_PARAMETER;
return VB2_SUCCESS;
}
vb2_gbb_flags_t vb2api_gbb_get_flags(struct vb2_context *ctx)
{
struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
return gbb->flags;
}
|