1 /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 *
5 * Routines for verifying a kernel or disk image
6 */
7
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11
12 #include "host_common.h"
13 #include "util_misc.h"
14 #include "vboot_common.h"
15 #include "vboot_api.h"
16 #include "vboot_kernel.h"
17
18 static uint8_t *diskbuf;
19
20 static uint8_t shared_data[VB_SHARED_DATA_MIN_SIZE];
21 static VbSharedDataHeader *shared = (VbSharedDataHeader *)shared_data;
22 static VbNvContext nvc;
23
24 static LoadKernelParams params;
25 static VbCommonParams cparams;
26
VbExDiskRead(VbExDiskHandle_t handle,uint64_t lba_start,uint64_t lba_count,void * buffer)27 VbError_t VbExDiskRead(VbExDiskHandle_t handle, uint64_t lba_start,
28 uint64_t lba_count, void *buffer)
29 {
30 if (handle != (VbExDiskHandle_t)1)
31 return VBERROR_UNKNOWN;
32 if (lba_start >= params.streaming_lba_count)
33 return VBERROR_UNKNOWN;
34 if (lba_start + lba_count > params.streaming_lba_count)
35 return VBERROR_UNKNOWN;
36
37 memcpy(buffer, diskbuf + lba_start * 512, lba_count * 512);
38 return VBERROR_SUCCESS;
39 }
40
VbExDiskWrite(VbExDiskHandle_t handle,uint64_t lba_start,uint64_t lba_count,const void * buffer)41 VbError_t VbExDiskWrite(VbExDiskHandle_t handle, uint64_t lba_start,
42 uint64_t lba_count, const void *buffer)
43 {
44 if (handle != (VbExDiskHandle_t)1)
45 return VBERROR_UNKNOWN;
46 if (lba_start >= params.streaming_lba_count)
47 return VBERROR_UNKNOWN;
48 if (lba_start + lba_count > params.streaming_lba_count)
49 return VBERROR_UNKNOWN;
50
51 memcpy(diskbuf + lba_start * 512, buffer, lba_count * 512);
52 return VBERROR_SUCCESS;
53 }
54
print_help(const char * progname)55 static void print_help(const char *progname)
56 {
57 printf("\nUsage: %s <disk_image> <kernel.vbpubk>\n\n",
58 progname);
59 }
60
main(int argc,char * argv[])61 int main(int argc, char *argv[])
62 {
63 VbPublicKey *kernkey;
64 uint64_t disk_bytes = 0;
65 int rv;
66
67 if (argc < 3) {
68 print_help(argv[0]);
69 return 1;
70 }
71
72 /* Load disk file */
73 /* TODO: is it better to mmap() in the long run? */
74 diskbuf = ReadFile(argv[1], &disk_bytes);
75 if (!diskbuf) {
76 fprintf(stderr, "Can't read disk file %s\n", argv[1]);
77 return 1;
78 }
79
80 /* Read public key */
81 kernkey = PublicKeyRead(argv[2]);
82 if (!kernkey) {
83 fprintf(stderr, "Can't read key file %s\n", argv[2]);
84 return 1;
85 }
86
87 /* Set up shared data blob */
88 VbSharedDataInit(shared, sizeof(shared_data));
89 VbSharedDataSetKernelKey(shared, kernkey);
90 /* TODO: optional TPM current kernel version */
91
92 /* Set up params */
93 params.shared_data_blob = shared_data;
94 params.shared_data_size = sizeof(shared_data);
95 params.disk_handle = (VbExDiskHandle_t)1;
96 params.bytes_per_lba = 512;
97 params.streaming_lba_count = disk_bytes / 512;
98 params.gpt_lba_count = params.streaming_lba_count;
99
100 params.kernel_buffer_size = 16 * 1024 * 1024;
101 params.kernel_buffer = malloc(params.kernel_buffer_size);
102 if (!params.kernel_buffer) {
103 fprintf(stderr, "Can't allocate kernel buffer\n");
104 return 1;
105 }
106
107 /* GBB and cparams only needed by LoadKernel() in recovery mode */
108 params.gbb_data = NULL;
109 params.gbb_size = 0;
110
111 /* TODO(chromium:441893): support dev-mode flag and external gpt flag */
112 params.boot_flags = 0;
113
114 /*
115 * LoadKernel() cares only about VBNV_DEV_BOOT_SIGNED_ONLY, and only in
116 * dev mode. So just use defaults.
117 */
118 VbNvSetup(&nvc);
119 params.nv_context = &nvc;
120
121 /* Try loading kernel */
122 rv = LoadKernel(¶ms, &cparams);
123 if (rv != VBERROR_SUCCESS) {
124 fprintf(stderr, "LoadKernel() failed with code %d\n", rv);
125 return 1;
126 }
127
128 printf("Found a good kernel.\n");
129 printf("Partition number: %d\n", (int)params.partition_number);
130 printf("Bootloader address: 0x%" PRIx64 "\n",
131 params.bootloader_address);
132
133 /* TODO: print other things (partition GUID, nv_context, shared_data) */
134
135 printf("Yaay!\n");
136 return 0;
137 }
138