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/* Copyright 2015 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.
*
* Exports a vmlinuz from a kernel partition in memory.
*/
#include <stdlib.h>
#include <string.h>
#include "2common.h"
#include "2struct.h"
#include "vboot_host.h"
#include "vboot_struct.h"
int ExtractVmlinuz(void *kpart_data, size_t kpart_size,
void **vmlinuz_out, size_t *vmlinuz_size) {
size_t now = 0;
struct vb2_kernel_preamble *preamble = NULL;
uint8_t *kblob_data = NULL;
uint32_t kblob_size = 0;
uint32_t vmlinuz_header_size = 0;
uint64_t vmlinuz_header_address = 0;
uint64_t vmlinuz_header_offset = 0;
void *vmlinuz = NULL;
struct vb2_keyblock *keyblock = (struct vb2_keyblock *)kpart_data;
now += keyblock->keyblock_size;
if (now > kpart_size)
return 1;
preamble = (struct vb2_kernel_preamble *)(kpart_data + now);
now += preamble->preamble_size;
if (now > kpart_size)
return 1;
kblob_data = kpart_data + now;
kblob_size = preamble->body_signature.data_size;
if (!kblob_data || (now + kblob_size) > kpart_size)
return 1;
if (preamble->header_version_minor > 0) {
vmlinuz_header_address = preamble->vmlinuz_header_address;
vmlinuz_header_size = preamble->vmlinuz_header_size;
}
if (!vmlinuz_header_size ||
kpart_data + vmlinuz_header_offset + vmlinuz_header_size >
kpart_data) {
return 1;
}
// calculate the vmlinuz_header offset from
// the beginning of the kpart_data. The kblob doesn't
// include the body_load_offset, but does include
// the keyblock and preamble sections.
vmlinuz_header_offset = vmlinuz_header_address -
preamble->body_load_address +
keyblock->keyblock_size +
preamble->preamble_size;
vmlinuz = malloc(vmlinuz_header_size + kblob_size);
if (vmlinuz == NULL)
return 1;
memcpy(vmlinuz, kpart_data + vmlinuz_header_offset,
vmlinuz_header_size);
memcpy(vmlinuz + vmlinuz_header_size, kblob_data, kblob_size);
*vmlinuz_out = vmlinuz;
*vmlinuz_size = vmlinuz_header_size + kblob_size;
return 0;
}
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