blob: be70cec7f18622a074fbddd7eb722c5c2fd9682e [file] [log] [blame]
* Copyright (C) 2015 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
* This program verifies the integrity of the partitions after an A/B OTA
* update. It gets invoked by init, and will only perform the verification if
* it's the first boot post an A/B OTA update.
* It relies on dm-verity to capture any corruption on the partitions being
* verified. dm-verity must be in enforcing mode, so that it will reboot the
* device on dm-verity failures. When that happens, the bootloader should
* mark the slot as unbootable and stops trying. We should never see a device
* started in dm-verity logging mode but with isSlotMarkedSuccessful equals to
* 0.
* The current slot will be marked as having booted successfully if the
* verifier reaches the end after the verification.
* TODO: The actual verification part will be added later after we have the
* A/B OTA package format in place.
#include <string.h>
#include <hardware/boot_control.h>
#define LOG_TAG "update_verifier"
#include <log/log.h>
int main(int argc, char** argv) {
for (int i = 1; i < argc; i++) {
SLOGI("Started with arg %d: %s\n", i, argv[i]);
const hw_module_t* hw_module;
if (hw_get_module("bootctrl", &hw_module) != 0) {
SLOGE("Error getting bootctrl module.\n");
return -1;
boot_control_module_t* module = reinterpret_cast<boot_control_module_t*>(
unsigned current_slot = module->getCurrentSlot(module);
int is_successful= module->isSlotMarkedSuccessful(module, current_slot);
SLOGI("Booting slot %u: isSlotMarkedSuccessful=%d\n", current_slot, is_successful);
if (is_successful == 0) {
// The current slot has not booted successfully.
// TODO: Add the actual verification after we have the A/B OTA package
// format in place.
// TODO: Assert the dm-verity mode. Bootloader should never boot a newly
// flashed slot (isSlotMarkedSuccessful == 0) with dm-verity logging mode.
int ret = module->markBootSuccessful(module);
if (ret != 0) {
SLOGE("Error marking booted successfully: %s\n", strerror(-ret));
return -1;
SLOGI("Marked slot %u as booted successfully.\n", current_slot);
SLOGI("Leaving update_verifier.\n");
return 0;