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/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* 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 isSlotBootable 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 <cutils/klog.h>
#include <string.h>
#include <hardware/boot_control.h>
#define LOG_TAG "update_verifier"
#define INFO(x...) KLOG_INFO(LOG_TAG, x)
#define ERROR(x...) KLOG_ERROR(LOG_TAG, x)
int main(int argc, char** argv) {
klog_init();
klog_set_level(6);
for (int i = 1; i < argc; i++) {
INFO("Started with arg %d: %s\n", i, argv[i]);
}
const hw_module_t* hw_module;
if (hw_get_module("bootctrl", &hw_module) != 0) {
ERROR("Error getting bootctrl module.\n");
return -1;
}
boot_control_module_t* module = reinterpret_cast<boot_control_module_t*>(
const_cast<hw_module_t*>(hw_module));
module->init(module);
unsigned current_slot = module->getCurrentSlot(module);
int bootable = module->isSlotBootable(module, current_slot);
INFO("Booting slot %u: isSlotBootable=%d\n", current_slot, bootable);
if (bootable == 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 (isSlotBootable == 0) with dm-verity logging mode.
int ret = module->markBootSuccessful(module);
if (ret != 0) {
ERROR("Error marking booted successfully: %s\n", strerror(-ret));
return -1;
}
INFO("Marked slot %u as booted successfully.\n", current_slot);
}
INFO("Leaving update_verifier.\n");
return 0;
}
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