tests/verify_kernel.c

/* Copyright 2014 The ChromiumOS Authors
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Routines for verifying a kernel or disk image
 */

#include "2sysincludes.h"
#include "2api.h"
#include "2common.h"
#include "2misc.h"
#include "2nvstorage.h"
#include "2secdata.h"
#include "host_common.h"
#include "util_misc.h"
#include "vboot_api.h"

static uint8_t workbuf[VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE]
	__attribute__((aligned(VB2_WORKBUF_ALIGN)));
static struct vb2_context *ctx;

static uint8_t *diskbuf;

static struct vb2_kernel_params params;
static struct vb2_disk_info disk_info;

vb2_error_t VbExDiskRead(vb2ex_disk_handle_t handle, uint64_t lba_start,
			 uint64_t lba_count, void *buffer)
{
	if (handle != (vb2ex_disk_handle_t)1)
		return VB2_ERROR_UNKNOWN;
	if (lba_start >= disk_info.lba_count)
		return VB2_ERROR_UNKNOWN;
	if (lba_start + lba_count > disk_info.lba_count)
		return VB2_ERROR_UNKNOWN;

	memcpy(buffer, diskbuf + lba_start * 512, lba_count * 512);
	return VB2_SUCCESS;
}

vb2_error_t VbExDiskWrite(vb2ex_disk_handle_t handle, uint64_t lba_start,
			  uint64_t lba_count, const void *buffer)
{
	if (handle != (vb2ex_disk_handle_t)1)
		return VB2_ERROR_UNKNOWN;
	if (lba_start >= disk_info.lba_count)
		return VB2_ERROR_UNKNOWN;
	if (lba_start + lba_count > disk_info.lba_count)
		return VB2_ERROR_UNKNOWN;

	memcpy(diskbuf + lba_start * 512, buffer, lba_count * 512);
	return VB2_SUCCESS;
}

static void print_help(const char *progname)
{
	printf("\nUsage: %s <disk_image> <kernel.vbpubk>\n\n",
	       progname);
}

int main(int argc, char *argv[])
{
	uint8_t *kernkey = NULL;
	uint64_t kernkey_size = 0;
	uint64_t disk_bytes = 0;
	vb2_error_t rv;

	if (argc < 3) {
		print_help(argv[0]);
		return 1;
	}

	/* Load disk file */
	/* TODO: is it better to mmap() in the long run? */
	diskbuf = ReadFile(argv[1], &disk_bytes);
	if (!diskbuf) {
		fprintf(stderr, "Can't read disk file %s\n", argv[1]);
		return 1;
	}

	/* Read public key */
	kernkey = ReadFile(argv[2], &kernkey_size);
	if (!kernkey) {
		fprintf(stderr, "Can't read key file %s\n", argv[2]);
		return 1;
	}

	/* Set up params */
	disk_info.handle = (vb2ex_disk_handle_t)1;
	disk_info.bytes_per_lba = 512;
	disk_info.lba_count =  disk_bytes / 512;

	params.kernel_buffer_size = 16 * 1024 * 1024;
	params.kernel_buffer = malloc(params.kernel_buffer_size);
	if (!params.kernel_buffer) {
		fprintf(stderr, "Can't allocate kernel buffer\n");
		return 1;
	}

	if (vb2api_init(&workbuf, sizeof(workbuf), &ctx)) {
		fprintf(stderr, "Can't initialize workbuf\n");
		return 1;
	}

	rv = vb2api_inject_kernel_subkey(ctx, kernkey, kernkey_size);
	if (rv != VB2_SUCCESS) {
		fprintf(stderr, "vb2api_inject_kernel_subkey failed: %x\n",
			rv);
		return 1;
	}

	/* Try loading kernel */
	rv = vb2api_load_kernel(ctx, &params, &disk_info);
	if (rv != VB2_SUCCESS) {
		fprintf(stderr, "vb2api_load_kernel() failed with code %x\n",
			rv);
		return 1;
	}

	printf("Found a good kernel.\n");
	printf("Bootloader offset: 0x%" PRIx64 "\n",
	       params.bootloader_offset);

	/* TODO: print other things (partition GUID, shared_data) */

	printf("Yaay!\n");
	return 0;
}