mirror of
https://github.com/espressif/esp-idf.git
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1005 lines
39 KiB
C
1005 lines
39 KiB
C
/*
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* SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <stdint.h>
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#include <limits.h>
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#include <sys/param.h>
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#include "esp_attr.h"
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#include "esp_log.h"
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#include "esp_rom_sys.h"
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#include "esp_rom_uart.h"
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#include "sdkconfig.h"
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#if CONFIG_IDF_TARGET_ESP32
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#include "esp32/rom/cache.h"
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#endif
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#include "esp_rom_spiflash.h"
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#include "soc/soc.h"
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#include "soc/rtc.h"
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#include "soc/efuse_periph.h"
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#include "soc/rtc_periph.h"
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#include "soc/timer_periph.h"
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#include "hal/mmu_hal.h"
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#include "hal/mmu_ll.h"
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#include "hal/cache_types.h"
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#include "hal/cache_ll.h"
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#include "hal/cache_hal.h"
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#include "esp_cpu.h"
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#include "esp_image_format.h"
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#include "esp_app_desc.h"
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#include "esp_secure_boot.h"
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#include "esp_flash_encrypt.h"
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#ifndef BOOTLOADER_BUILD
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#include "spi_flash_mmap.h"
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#endif
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#include "esp_flash_partitions.h"
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#include "bootloader_flash_priv.h"
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#include "bootloader_random.h"
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#include "bootloader_config.h"
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#include "bootloader_common.h"
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#include "bootloader_utility.h"
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#include "bootloader_sha.h"
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#include "bootloader_console.h"
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#include "bootloader_soc.h"
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#include "bootloader_memory_utils.h"
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#include "esp_efuse.h"
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#include "esp_fault.h"
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static const char *TAG = "boot";
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/* Reduce literal size for some generic string literals */
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#define MAP_ERR_MSG "Image contains multiple %s segments. Only the last one will be mapped."
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static bool ota_has_initial_contents;
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static void load_image(const esp_image_metadata_t *image_data);
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static void unpack_load_app(const esp_image_metadata_t *data);
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static void set_cache_and_start_app(uint32_t drom_addr,
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uint32_t drom_load_addr,
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uint32_t drom_size,
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uint32_t irom_addr,
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uint32_t irom_load_addr,
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uint32_t irom_size,
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uint32_t entry_addr);
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esp_err_t bootloader_common_read_otadata(const esp_partition_pos_t *ota_info, esp_ota_select_entry_t *two_otadata)
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{
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const esp_ota_select_entry_t *ota_select_map;
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if (ota_info->offset == 0) {
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return ESP_ERR_NOT_FOUND;
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}
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// partition table has OTA data partition
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if (ota_info->size < 2 * SPI_SEC_SIZE) {
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ESP_LOGE(TAG, "ota_info partition size %"PRIu32" is too small (minimum %d bytes)", ota_info->size, (2 * SPI_SEC_SIZE));
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return ESP_FAIL; // can't proceed
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}
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ESP_LOGD(TAG, "OTA data offset 0x%"PRIx32, ota_info->offset);
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ota_select_map = bootloader_mmap(ota_info->offset, ota_info->size);
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if (!ota_select_map) {
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ESP_LOGE(TAG, "bootloader_mmap(0x%"PRIx32", 0x%"PRIx32") failed", ota_info->offset, ota_info->size);
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return ESP_FAIL; // can't proceed
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}
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memcpy(&two_otadata[0], ota_select_map, sizeof(esp_ota_select_entry_t));
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memcpy(&two_otadata[1], (uint8_t *)ota_select_map + SPI_SEC_SIZE, sizeof(esp_ota_select_entry_t));
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bootloader_munmap(ota_select_map);
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return ESP_OK;
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}
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esp_err_t bootloader_common_get_partition_description(const esp_partition_pos_t *partition, esp_app_desc_t *app_desc)
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{
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if (partition == NULL || app_desc == NULL || partition->offset == 0) {
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return ESP_ERR_INVALID_ARG;
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}
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const uint32_t app_desc_offset = sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t);
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const uint32_t mmap_size = app_desc_offset + sizeof(esp_app_desc_t);
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const uint8_t *image = bootloader_mmap(partition->offset, mmap_size);
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if (image == NULL) {
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ESP_LOGE(TAG, "bootloader_mmap(0x%"PRIx32", 0x%"PRIx32") failed", partition->offset, mmap_size);
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return ESP_FAIL;
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}
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memcpy(app_desc, image + app_desc_offset, sizeof(esp_app_desc_t));
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bootloader_munmap(image);
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if (app_desc->magic_word != ESP_APP_DESC_MAGIC_WORD) {
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return ESP_ERR_NOT_FOUND;
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}
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return ESP_OK;
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}
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bool bootloader_utility_load_partition_table(bootloader_state_t *bs)
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{
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const esp_partition_info_t *partitions;
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const char *partition_usage;
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esp_err_t err;
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int num_partitions;
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partitions = bootloader_mmap(ESP_PARTITION_TABLE_OFFSET, ESP_PARTITION_TABLE_MAX_LEN);
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if (!partitions) {
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ESP_LOGE(TAG, "bootloader_mmap(0x%x, 0x%x) failed", ESP_PARTITION_TABLE_OFFSET, ESP_PARTITION_TABLE_MAX_LEN);
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return false;
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}
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ESP_LOGD(TAG, "mapped partition table 0x%x at 0x%x", ESP_PARTITION_TABLE_OFFSET, (intptr_t)partitions);
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err = esp_partition_table_verify(partitions, true, &num_partitions);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Failed to verify partition table");
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return false;
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}
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ESP_LOGI(TAG, "Partition Table:");
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ESP_LOGI(TAG, "## Label Usage Type ST Offset Length");
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for (int i = 0; i < num_partitions; i++) {
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const esp_partition_info_t *partition = &partitions[i];
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ESP_LOGD(TAG, "load partition table entry 0x%x", (intptr_t)partition);
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ESP_LOGD(TAG, "type=%x subtype=%x", partition->type, partition->subtype);
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partition_usage = "unknown";
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/* valid partition table */
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switch (partition->type) {
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case PART_TYPE_APP: /* app partition */
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switch (partition->subtype) {
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case PART_SUBTYPE_FACTORY: /* factory binary */
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bs->factory = partition->pos;
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partition_usage = "factory app";
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break;
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case PART_SUBTYPE_TEST: /* test binary */
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bs->test = partition->pos;
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partition_usage = "test app";
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break;
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default:
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/* OTA binary */
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if ((partition->subtype & ~PART_SUBTYPE_OTA_MASK) == PART_SUBTYPE_OTA_FLAG) {
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bs->ota[partition->subtype & PART_SUBTYPE_OTA_MASK] = partition->pos;
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++bs->app_count;
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partition_usage = "OTA app";
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} else {
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partition_usage = "Unknown app";
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}
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break;
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}
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break; /* PART_TYPE_APP */
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case PART_TYPE_DATA: /* data partition */
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switch (partition->subtype) {
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case PART_SUBTYPE_DATA_OTA: /* ota data */
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bs->ota_info = partition->pos;
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partition_usage = "OTA data";
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break;
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case PART_SUBTYPE_DATA_RF:
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partition_usage = "RF data";
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break;
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case PART_SUBTYPE_DATA_WIFI:
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partition_usage = "WiFi data";
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break;
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case PART_SUBTYPE_DATA_NVS_KEYS:
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partition_usage = "NVS keys";
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break;
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case PART_SUBTYPE_DATA_EFUSE_EM:
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partition_usage = "efuse";
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#ifdef CONFIG_EFUSE_VIRTUAL_KEEP_IN_FLASH
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esp_efuse_init_virtual_mode_in_flash(partition->pos.offset, partition->pos.size);
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#endif
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break;
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default:
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partition_usage = "Unknown data";
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break;
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}
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break; /* PARTITION_USAGE_DATA */
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default: /* other partition type */
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break;
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}
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/* print partition type info */
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ESP_LOGI(TAG, "%2d %-16s %-16s %02x %02x %08"PRIx32" %08"PRIx32, i, partition->label, partition_usage,
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partition->type, partition->subtype,
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partition->pos.offset, partition->pos.size);
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}
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bootloader_munmap(partitions);
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ESP_LOGI(TAG, "End of partition table");
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return true;
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}
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/* Given a partition index, return the partition position data from the bootloader_state_t structure */
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static esp_partition_pos_t index_to_partition(const bootloader_state_t *bs, int index)
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{
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if (index == FACTORY_INDEX) {
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return bs->factory;
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}
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if (index == TEST_APP_INDEX) {
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return bs->test;
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}
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if (index >= 0 && index < MAX_OTA_SLOTS && index < (int)bs->app_count) {
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return bs->ota[index];
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}
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esp_partition_pos_t invalid = { 0 };
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return invalid;
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}
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static void log_invalid_app_partition(int index)
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{
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const char *not_bootable = " is not bootable"; /* save a few string literal bytes */
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switch (index) {
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case FACTORY_INDEX:
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ESP_LOGE(TAG, "Factory app partition%s", not_bootable);
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break;
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case TEST_APP_INDEX:
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ESP_LOGE(TAG, "Factory test app partition%s", not_bootable);
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break;
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default:
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ESP_LOGE(TAG, "OTA app partition slot %d%s", index, not_bootable);
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break;
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}
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}
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static esp_err_t write_otadata(esp_ota_select_entry_t *otadata, uint32_t offset, bool write_encrypted)
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{
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esp_err_t err = bootloader_flash_erase_sector(offset / FLASH_SECTOR_SIZE);
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if (err == ESP_OK) {
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err = bootloader_flash_write(offset, otadata, sizeof(esp_ota_select_entry_t), write_encrypted);
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}
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Error in write_otadata operation. err = 0x%x", err);
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}
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return err;
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}
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static bool check_anti_rollback(const esp_partition_pos_t *partition)
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{
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#ifdef CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK
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esp_app_desc_t app_desc = {};
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esp_err_t err = bootloader_common_get_partition_description(partition, &app_desc);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Failed to get partition description %d", err);
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return false;
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}
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bool sec_ver = esp_efuse_check_secure_version(app_desc.secure_version);
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/* Anti FI check */
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ESP_FAULT_ASSERT(sec_ver == esp_efuse_check_secure_version(app_desc.secure_version));
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return sec_ver;
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#else
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return true;
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#endif
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}
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#ifdef CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK
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static void update_anti_rollback(const esp_partition_pos_t *partition)
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{
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esp_app_desc_t app_desc;
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esp_err_t err = bootloader_common_get_partition_description(partition, &app_desc);
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if (err == ESP_OK) {
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esp_efuse_update_secure_version(app_desc.secure_version);
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} else {
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ESP_LOGE(TAG, "Failed to get partition description %d", err);
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}
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}
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static int get_active_otadata_with_check_anti_rollback(const bootloader_state_t *bs, esp_ota_select_entry_t *two_otadata)
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{
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uint32_t ota_seq;
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uint32_t ota_slot;
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bool valid_otadata[2];
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valid_otadata[0] = bootloader_common_ota_select_valid(&two_otadata[0]);
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valid_otadata[1] = bootloader_common_ota_select_valid(&two_otadata[1]);
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bool sec_ver_valid_otadata[2] = { 0 };
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for (int i = 0; i < 2; ++i) {
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if (valid_otadata[i] == true) {
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ota_seq = two_otadata[i].ota_seq - 1; // Raw OTA sequence number. May be more than # of OTA slots
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ota_slot = ota_seq % bs->app_count; // Actual OTA partition selection
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if (check_anti_rollback(&bs->ota[ota_slot]) == false) {
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// invalid. This otadata[i] will not be selected as active.
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ESP_LOGD(TAG, "OTA slot %"PRIu32" has an app with secure_version, this version is smaller than in the device. This OTA slot will not be selected.", ota_slot);
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} else {
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sec_ver_valid_otadata[i] = true;
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}
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}
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}
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return bootloader_common_select_otadata(two_otadata, sec_ver_valid_otadata, true);
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}
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#endif
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int bootloader_utility_get_selected_boot_partition(const bootloader_state_t *bs)
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{
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esp_ota_select_entry_t otadata[2];
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int boot_index = FACTORY_INDEX;
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if (bs->ota_info.offset == 0) {
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return FACTORY_INDEX;
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}
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if (bootloader_common_read_otadata(&bs->ota_info, otadata) != ESP_OK) {
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return INVALID_INDEX;
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}
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ota_has_initial_contents = false;
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ESP_LOGD(TAG, "otadata[0]: sequence values 0x%08"PRIx32, otadata[0].ota_seq);
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ESP_LOGD(TAG, "otadata[1]: sequence values 0x%08"PRIx32, otadata[1].ota_seq);
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#ifdef CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE
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bool write_encrypted = esp_flash_encryption_enabled();
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for (int i = 0; i < 2; ++i) {
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if (otadata[i].ota_state == ESP_OTA_IMG_PENDING_VERIFY) {
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ESP_LOGD(TAG, "otadata[%d] is marking as ABORTED", i);
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otadata[i].ota_state = ESP_OTA_IMG_ABORTED;
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write_otadata(&otadata[i], bs->ota_info.offset + FLASH_SECTOR_SIZE * i, write_encrypted);
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}
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}
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#endif
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#ifndef CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK
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if ((bootloader_common_ota_select_invalid(&otadata[0]) &&
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bootloader_common_ota_select_invalid(&otadata[1])) ||
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bs->app_count == 0) {
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ESP_LOGD(TAG, "OTA sequence numbers both empty (all-0xFF) or partition table does not have bootable ota_apps (app_count=%"PRIu32")", bs->app_count);
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if (bs->factory.offset != 0) {
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ESP_LOGI(TAG, "Defaulting to factory image");
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boot_index = FACTORY_INDEX;
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} else {
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ESP_LOGI(TAG, "No factory image, trying OTA 0");
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boot_index = 0;
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// Try to boot from ota_0.
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if ((otadata[0].ota_seq == UINT32_MAX || otadata[0].crc != bootloader_common_ota_select_crc(&otadata[0])) &&
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(otadata[1].ota_seq == UINT32_MAX || otadata[1].crc != bootloader_common_ota_select_crc(&otadata[1]))) {
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// Factory is not found and both otadata are initial(0xFFFFFFFF) or incorrect crc.
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// will set correct ota_seq.
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ota_has_initial_contents = true;
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}
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}
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} else {
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int active_otadata = bootloader_common_get_active_otadata(otadata);
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#else
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ESP_LOGI(TAG, "Enabled a check secure version of app for anti rollback");
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ESP_LOGI(TAG, "Secure version (from eFuse) = %"PRIu32, esp_efuse_read_secure_version());
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// When CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK is enabled factory partition should not be in partition table, only two ota_app are there.
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if ((otadata[0].ota_seq == UINT32_MAX || otadata[0].crc != bootloader_common_ota_select_crc(&otadata[0])) &&
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(otadata[1].ota_seq == UINT32_MAX || otadata[1].crc != bootloader_common_ota_select_crc(&otadata[1]))) {
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ESP_LOGI(TAG, "otadata[0..1] in initial state");
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// both otadata are initial(0xFFFFFFFF) or incorrect crc.
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// will set correct ota_seq.
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ota_has_initial_contents = true;
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} else {
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int active_otadata = get_active_otadata_with_check_anti_rollback(bs, otadata);
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#endif
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if (active_otadata != -1) {
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ESP_LOGD(TAG, "Active otadata[%d]", active_otadata);
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uint32_t ota_seq = otadata[active_otadata].ota_seq - 1; // Raw OTA sequence number. May be more than # of OTA slots
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boot_index = ota_seq % bs->app_count; // Actual OTA partition selection
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ESP_LOGD(TAG, "Mapping seq %"PRIu32" -> OTA slot %d", ota_seq, boot_index);
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#ifdef CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE
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if (otadata[active_otadata].ota_state == ESP_OTA_IMG_NEW) {
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ESP_LOGD(TAG, "otadata[%d] is selected as new and marked PENDING_VERIFY state", active_otadata);
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otadata[active_otadata].ota_state = ESP_OTA_IMG_PENDING_VERIFY;
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write_otadata(&otadata[active_otadata], bs->ota_info.offset + FLASH_SECTOR_SIZE * active_otadata, write_encrypted);
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}
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#endif // CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE
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#ifdef CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK
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if (otadata[active_otadata].ota_state == ESP_OTA_IMG_VALID) {
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update_anti_rollback(&bs->ota[boot_index]);
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}
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#endif // CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK
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} else if (bs->factory.offset != 0) {
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ESP_LOGE(TAG, "ota data partition invalid, falling back to factory");
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boot_index = FACTORY_INDEX;
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} else {
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ESP_LOGE(TAG, "ota data partition invalid and no factory, will try all partitions");
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boot_index = FACTORY_INDEX;
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}
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}
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return boot_index;
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}
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/* Return true if a partition has a valid app image that was successfully loaded */
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static bool try_load_partition(const esp_partition_pos_t *partition, esp_image_metadata_t *data)
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{
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if (partition->size == 0) {
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ESP_LOGD(TAG, "Can't boot from zero-length partition");
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return false;
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}
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#ifdef BOOTLOADER_BUILD
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if (bootloader_load_image(partition, data) == ESP_OK) {
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ESP_LOGI(TAG, "Loaded app from partition at offset 0x%" PRIx32, partition->offset);
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return true;
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}
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#endif
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return false;
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}
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// ota_has_initial_contents flag is set if factory does not present in partition table and
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// otadata has initial content(0xFFFFFFFF), then set actual ota_seq.
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|
static void set_actual_ota_seq(const bootloader_state_t *bs, int index)
|
|
{
|
|
if (index > FACTORY_INDEX && ota_has_initial_contents == true) {
|
|
esp_ota_select_entry_t otadata;
|
|
memset(&otadata, 0xFF, sizeof(otadata));
|
|
otadata.ota_seq = index + 1;
|
|
otadata.ota_state = ESP_OTA_IMG_VALID;
|
|
otadata.crc = bootloader_common_ota_select_crc(&otadata);
|
|
|
|
bool write_encrypted = esp_flash_encryption_enabled();
|
|
write_otadata(&otadata, bs->ota_info.offset + FLASH_SECTOR_SIZE * 0, write_encrypted);
|
|
ESP_LOGI(TAG, "Set actual ota_seq=%"PRIu32" in otadata[0]", otadata.ota_seq);
|
|
#ifdef CONFIG_BOOTLOADER_APP_ANTI_ROLLBACK
|
|
update_anti_rollback(&bs->ota[index]);
|
|
#endif
|
|
}
|
|
#if CONFIG_BOOTLOADER_RESERVE_RTC_MEM
|
|
#ifdef CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP
|
|
esp_partition_pos_t partition = index_to_partition(bs, index);
|
|
bootloader_common_update_rtc_retain_mem(&partition, true);
|
|
#else
|
|
bootloader_common_update_rtc_retain_mem(NULL, true);
|
|
#endif
|
|
#endif // CONFIG_BOOTLOADER_RESERVE_RTC_MEM
|
|
}
|
|
|
|
#ifdef CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP
|
|
void bootloader_utility_load_boot_image_from_deep_sleep(void)
|
|
{
|
|
if (esp_rom_get_reset_reason(0) == RESET_REASON_CORE_DEEP_SLEEP) {
|
|
esp_partition_pos_t *partition = bootloader_common_get_rtc_retain_mem_partition();
|
|
if (partition != NULL) {
|
|
esp_image_metadata_t image_data;
|
|
if (bootloader_load_image_no_verify(partition, &image_data) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Fast booting app from partition at offset 0x%"PRIx32, partition->offset);
|
|
bootloader_common_update_rtc_retain_mem(NULL, true);
|
|
load_image(&image_data);
|
|
}
|
|
}
|
|
ESP_LOGE(TAG, "Fast booting is not successful");
|
|
ESP_LOGI(TAG, "Try to load an app as usual with all validations");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#define TRY_LOG_FORMAT "Trying partition index %d offs 0x%"PRIx32" size 0x%"PRIx32
|
|
|
|
void bootloader_utility_load_boot_image(const bootloader_state_t *bs, int start_index)
|
|
{
|
|
int index = start_index;
|
|
esp_partition_pos_t part;
|
|
esp_image_metadata_t image_data = {0};
|
|
|
|
if (start_index == TEST_APP_INDEX) {
|
|
if (check_anti_rollback(&bs->test) && try_load_partition(&bs->test, &image_data)) {
|
|
load_image(&image_data);
|
|
} else {
|
|
ESP_LOGE(TAG, "No bootable test partition in the partition table");
|
|
bootloader_reset();
|
|
}
|
|
}
|
|
|
|
/* work backwards from start_index, down to the factory app */
|
|
for (index = start_index; index >= FACTORY_INDEX; index--) {
|
|
part = index_to_partition(bs, index);
|
|
if (part.size == 0) {
|
|
continue;
|
|
}
|
|
ESP_LOGD(TAG, TRY_LOG_FORMAT, index, part.offset, part.size);
|
|
if (check_anti_rollback(&part) && try_load_partition(&part, &image_data)) {
|
|
set_actual_ota_seq(bs, index);
|
|
load_image(&image_data);
|
|
}
|
|
log_invalid_app_partition(index);
|
|
}
|
|
|
|
/* failing that work forwards from start_index, try valid OTA slots */
|
|
for (index = start_index + 1; index < (int)bs->app_count; index++) {
|
|
part = index_to_partition(bs, index);
|
|
if (part.size == 0) {
|
|
continue;
|
|
}
|
|
ESP_LOGD(TAG, TRY_LOG_FORMAT, index, part.offset, part.size);
|
|
if (check_anti_rollback(&part) && try_load_partition(&part, &image_data)) {
|
|
set_actual_ota_seq(bs, index);
|
|
load_image(&image_data);
|
|
}
|
|
log_invalid_app_partition(index);
|
|
}
|
|
|
|
if (check_anti_rollback(&bs->test) && try_load_partition(&bs->test, &image_data)) {
|
|
ESP_LOGW(TAG, "Falling back to test app as only bootable partition");
|
|
load_image(&image_data);
|
|
}
|
|
|
|
ESP_LOGE(TAG, "No bootable app partitions in the partition table");
|
|
bzero(&image_data, sizeof(esp_image_metadata_t));
|
|
bootloader_reset();
|
|
}
|
|
|
|
// Copy loaded segments to RAM, set up caches for mapped segments, and start application.
|
|
static void load_image(const esp_image_metadata_t *image_data)
|
|
{
|
|
/**
|
|
* Rough steps for a first boot, when encryption and secure boot are both disabled:
|
|
* 1) Generate secure boot key and write to EFUSE.
|
|
* 2) Write plaintext digest based on plaintext bootloader
|
|
* 3) Generate flash encryption key and write to EFUSE.
|
|
* 4) Encrypt flash in-place including bootloader, then digest,
|
|
* then app partitions and other encrypted partitions
|
|
* 5) Burn EFUSE to enable flash encryption (FLASH_CRYPT_CNT)
|
|
* 6) Burn EFUSE to enable secure boot (ABS_DONE_0)
|
|
*
|
|
* If power failure happens during Step 1, probably the next boot will continue from Step 2.
|
|
* There is some small chance that EFUSEs will be part-way through being written so will be
|
|
* somehow corrupted here. Thankfully this window of time is very small, but if that's the
|
|
* case, one has to use the espefuse tool to manually set the remaining bits and enable R/W
|
|
* protection. Once the relevant EFUSE bits are set and R/W protected, Step 1 will be skipped
|
|
* successfully on further reboots.
|
|
*
|
|
* If power failure happens during Step 2, Step 1 will be skipped and Step 2 repeated:
|
|
* the digest will get re-written on the next boot.
|
|
*
|
|
* If power failure happens during Step 3, it's possible that EFUSE was partially written
|
|
* with the generated flash encryption key, though the time window for that would again
|
|
* be very small. On reboot, Step 1 will be skipped and Step 2 repeated, though, Step 3
|
|
* may fail due to the above mentioned reason, in which case, one has to use the espefuse
|
|
* tool to manually set the remaining bits and enable R/W protection. Once the relevant EFUSE
|
|
* bits are set and R/W protected, Step 3 will be skipped successfully on further reboots.
|
|
*
|
|
* If power failure happens after start of 4 and before end of 5, the next boot will fail
|
|
* (bootloader header is encrypted and flash encryption isn't enabled yet, so it looks like
|
|
* noise to the ROM bootloader). The check in the ROM is pretty basic so if the first byte of
|
|
* ciphertext happens to be the magic byte E9 then it may try to boot, but it will definitely
|
|
* crash (no chance that the remaining ciphertext will look like a valid bootloader image).
|
|
* Only solution is to reflash with all plaintext and the whole process starts again: skips
|
|
* Step 1, repeats Step 2, skips Step 3, etc.
|
|
*
|
|
* If power failure happens after 5 but before 6, the device will reboot with flash
|
|
* encryption on and will regenerate an encrypted digest in Step 2. This should still
|
|
* be valid as the input data for the digest is read via flash cache (so will be decrypted)
|
|
* and the code in secure_boot_generate() tells bootloader_flash_write() to encrypt the data
|
|
* on write if flash encryption is enabled. Steps 3 - 5 are skipped (encryption already on),
|
|
* then Step 6 enables secure boot.
|
|
*/
|
|
|
|
#if defined(CONFIG_SECURE_BOOT) || defined(CONFIG_SECURE_FLASH_ENC_ENABLED)
|
|
esp_err_t err;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SECURE_BOOT_FLASH_ENC_KEYS_BURN_TOGETHER
|
|
if (esp_secure_boot_enabled() ^ esp_flash_encrypt_initialized_once()) {
|
|
ESP_LOGE(TAG, "Secure Boot and Flash Encryption cannot be enabled separately, only together (their keys go into one eFuse key block)");
|
|
return;
|
|
}
|
|
|
|
if (!esp_secure_boot_enabled() || !esp_flash_encryption_enabled()) {
|
|
esp_efuse_batch_write_begin();
|
|
}
|
|
#endif // CONFIG_SECURE_BOOT_FLASH_ENC_KEYS_BURN_TOGETHER
|
|
|
|
#ifdef CONFIG_SECURE_BOOT_V2_ENABLED
|
|
err = esp_secure_boot_v2_permanently_enable(image_data);
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "Secure Boot v2 failed (%d)", err);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SECURE_BOOT_V1_ENABLED
|
|
/* Steps 1 & 2 (see above for full description):
|
|
* 1) Generate secure boot EFUSE key
|
|
* 2) Compute digest of plaintext bootloader
|
|
*/
|
|
err = esp_secure_boot_generate_digest();
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "Bootloader digest generation for secure boot failed (%d).", err);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SECURE_FLASH_ENC_ENABLED
|
|
/* Steps 3, 4 & 5 (see above for full description):
|
|
* 3) Generate flash encryption EFUSE key
|
|
* 4) Encrypt flash contents
|
|
* 5) Burn EFUSE to enable flash encryption
|
|
*/
|
|
ESP_LOGI(TAG, "Checking flash encryption...");
|
|
bool flash_encryption_enabled = esp_flash_encrypt_state();
|
|
if (!flash_encryption_enabled) {
|
|
#ifdef CONFIG_SECURE_FLASH_REQUIRE_ALREADY_ENABLED
|
|
ESP_LOGE(TAG, "flash encryption is not enabled, and SECURE_FLASH_REQUIRE_ALREADY_ENABLED is set, refusing to boot.");
|
|
return;
|
|
#endif // CONFIG_SECURE_FLASH_REQUIRE_ALREADY_ENABLED
|
|
|
|
if (esp_flash_encrypt_is_write_protected(true)) {
|
|
return;
|
|
}
|
|
|
|
err = esp_flash_encrypt_init();
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "Initialization of Flash Encryption key failed (%d)", err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SECURE_BOOT_FLASH_ENC_KEYS_BURN_TOGETHER
|
|
if (!esp_secure_boot_enabled() || !flash_encryption_enabled) {
|
|
err = esp_efuse_batch_write_commit();
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "Error programming eFuses (err=0x%x).", err);
|
|
return;
|
|
}
|
|
assert(esp_secure_boot_enabled());
|
|
ESP_LOGI(TAG, "Secure boot permanently enabled");
|
|
}
|
|
#endif // CONFIG_SECURE_BOOT_FLASH_ENC_KEYS_BURN_TOGETHER
|
|
|
|
if (!flash_encryption_enabled) {
|
|
err = esp_flash_encrypt_contents();
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "Encryption flash contents failed (%d)", err);
|
|
return;
|
|
}
|
|
|
|
err = esp_flash_encrypt_enable();
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "Enabling of Flash encryption failed (%d)", err);
|
|
return;
|
|
}
|
|
}
|
|
#endif // CONFIG_SECURE_FLASH_ENC_ENABLED
|
|
|
|
#ifdef CONFIG_SECURE_BOOT_V1_ENABLED
|
|
/* Step 6 (see above for full description):
|
|
* 6) Burn EFUSE to enable secure boot
|
|
*/
|
|
ESP_LOGI(TAG, "Checking secure boot...");
|
|
err = esp_secure_boot_permanently_enable();
|
|
if (err != ESP_OK) {
|
|
ESP_LOGE(TAG, "FAILED TO ENABLE SECURE BOOT (%d).", err);
|
|
/* Panic here as secure boot is not properly enabled
|
|
due to one of the reasons in above function
|
|
*/
|
|
abort();
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SECURE_FLASH_ENC_ENABLED
|
|
if (!flash_encryption_enabled && esp_flash_encryption_enabled()) {
|
|
/* Flash encryption was just enabled for the first time,
|
|
so issue a system reset to ensure flash encryption
|
|
cache resets properly */
|
|
ESP_LOGI(TAG, "Resetting with flash encryption enabled...");
|
|
esp_rom_output_tx_wait_idle(0);
|
|
bootloader_reset();
|
|
}
|
|
#endif
|
|
|
|
ESP_LOGI(TAG, "Disabling RNG early entropy source...");
|
|
bootloader_random_disable();
|
|
|
|
/* Disable glitch reset after all the security checks are completed.
|
|
* Glitch detection can be falsely triggered by EMI interference (high RF TX power, etc)
|
|
* and to avoid such false alarms, disable it.
|
|
*/
|
|
bootloader_ana_clock_glitch_reset_config(false);
|
|
|
|
// copy loaded segments to RAM, set up caches for mapped segments, and start application
|
|
unpack_load_app(image_data);
|
|
}
|
|
|
|
#if SOC_MMU_DI_VADDR_SHARED
|
|
static void unpack_load_app(const esp_image_metadata_t *data)
|
|
{
|
|
/**
|
|
* note:
|
|
* On chips with shared D/I external vaddr, we don't divide them into either D or I,
|
|
* as essentially they are the same.
|
|
* We integrate all the hardware difference into this `unpack_load_app` function.
|
|
*/
|
|
uint32_t rom_addr[2] = {};
|
|
uint32_t rom_load_addr[2] = {};
|
|
uint32_t rom_size[2] = {};
|
|
int rom_index = 0; //shall not exceed 2
|
|
|
|
// Find DROM & IROM addresses, to configure MMU mappings
|
|
for (int i = 0; i < data->image.segment_count; i++) {
|
|
const esp_image_segment_header_t *header = &data->segments[i];
|
|
bool text_or_rodata = false;
|
|
|
|
//`SOC_DROM_LOW` and `SOC_DROM_HIGH` are the same as `SOC_IROM_LOW` and `SOC_IROM_HIGH`, reasons are in above `note`
|
|
if (header->load_addr >= SOC_DROM_LOW && header->load_addr < SOC_DROM_HIGH) {
|
|
text_or_rodata = true;
|
|
}
|
|
#if SOC_MMU_PER_EXT_MEM_TARGET
|
|
if (header->load_addr >= SOC_EXTRAM_LOW && header->load_addr < SOC_EXTRAM_HIGH) {
|
|
text_or_rodata = true;
|
|
}
|
|
#endif
|
|
if (text_or_rodata) {
|
|
/**
|
|
* D/I are shared, but there should not be a third segment on flash/psram
|
|
*/
|
|
assert(rom_index < 2);
|
|
rom_addr[rom_index] = data->segment_data[i];
|
|
rom_load_addr[rom_index] = header->load_addr;
|
|
rom_size[rom_index] = header->data_len;
|
|
rom_index++;
|
|
}
|
|
}
|
|
assert(rom_index == 2);
|
|
|
|
ESP_EARLY_LOGD(TAG, "calling set_cache_and_start_app");
|
|
set_cache_and_start_app(rom_addr[0],
|
|
rom_load_addr[0],
|
|
rom_size[0],
|
|
rom_addr[1],
|
|
rom_load_addr[1],
|
|
rom_size[1],
|
|
data->image.entry_addr);
|
|
}
|
|
|
|
#else //!SOC_MMU_DI_VADDR_SHARED
|
|
static void unpack_load_app(const esp_image_metadata_t *data)
|
|
{
|
|
uint32_t drom_addr = 0;
|
|
uint32_t drom_load_addr = 0;
|
|
uint32_t drom_size = 0;
|
|
uint32_t irom_addr = 0;
|
|
uint32_t irom_load_addr = 0;
|
|
uint32_t irom_size = 0;
|
|
|
|
// Find DROM & IROM addresses, to configure MMU mappings
|
|
for (int i = 0; i < data->image.segment_count; i++) {
|
|
const esp_image_segment_header_t *header = &data->segments[i];
|
|
if (header->load_addr >= SOC_DROM_LOW && header->load_addr < SOC_DROM_HIGH) {
|
|
if (drom_addr != 0) {
|
|
ESP_EARLY_LOGE(TAG, MAP_ERR_MSG, "DROM");
|
|
} else {
|
|
ESP_EARLY_LOGD(TAG, "Mapping segment %d as %s", i, "DROM");
|
|
}
|
|
drom_addr = data->segment_data[i];
|
|
drom_load_addr = header->load_addr;
|
|
drom_size = header->data_len;
|
|
}
|
|
if (header->load_addr >= SOC_IROM_LOW && header->load_addr < SOC_IROM_HIGH) {
|
|
if (irom_addr != 0) {
|
|
ESP_EARLY_LOGE(TAG, MAP_ERR_MSG, "IROM");
|
|
} else {
|
|
ESP_EARLY_LOGD(TAG, "Mapping segment %d as %s", i, "IROM");
|
|
}
|
|
irom_addr = data->segment_data[i];
|
|
irom_load_addr = header->load_addr;
|
|
irom_size = header->data_len;
|
|
}
|
|
}
|
|
|
|
ESP_EARLY_LOGD(TAG, "calling set_cache_and_start_app");
|
|
set_cache_and_start_app(drom_addr,
|
|
drom_load_addr,
|
|
drom_size,
|
|
irom_addr,
|
|
irom_load_addr,
|
|
irom_size,
|
|
data->image.entry_addr);
|
|
}
|
|
#endif //#if SOC_MMU_DI_VADDR_SHARED
|
|
|
|
//unused for esp32
|
|
__attribute__((unused))
|
|
static bool s_flash_seg_needs_map(uint32_t vaddr)
|
|
{
|
|
#if SOC_MMU_PER_EXT_MEM_TARGET
|
|
//For these chips, segments on PSRAM will be mapped in app
|
|
bool is_psram = esp_ptr_in_extram((void *)vaddr);
|
|
return !is_psram;
|
|
#else
|
|
//For these chips, segments on Flash always need to be mapped
|
|
return true;
|
|
#endif
|
|
}
|
|
|
|
static void set_cache_and_start_app(
|
|
uint32_t drom_addr,
|
|
uint32_t drom_load_addr,
|
|
uint32_t drom_size,
|
|
uint32_t irom_addr,
|
|
uint32_t irom_load_addr,
|
|
uint32_t irom_size,
|
|
uint32_t entry_addr)
|
|
{
|
|
int rc __attribute__((unused));
|
|
|
|
ESP_EARLY_LOGD(TAG, "configure drom and irom and start");
|
|
//-----------------------Disable Cache to do the mapping---------
|
|
#if CONFIG_IDF_TARGET_ESP32
|
|
Cache_Read_Disable(0);
|
|
Cache_Flush(0);
|
|
#else
|
|
cache_hal_disable(CACHE_LL_LEVEL_EXT_MEM, CACHE_TYPE_ALL);
|
|
#endif
|
|
//reset MMU table first
|
|
mmu_hal_unmap_all();
|
|
|
|
//-----------------------MAP DROM--------------------------
|
|
uint32_t drom_load_addr_aligned = drom_load_addr & MMU_FLASH_MASK;
|
|
uint32_t drom_addr_aligned = drom_addr & MMU_FLASH_MASK;
|
|
ESP_EARLY_LOGV(TAG, "rodata starts from paddr=0x%08" PRIx32 ", vaddr=0x%08" PRIx32 ", size=0x%" PRIx32, drom_addr, drom_load_addr, drom_size);
|
|
//The addr is aligned, so we add the mask off length to the size, to make sure the corresponding buses are enabled.
|
|
drom_size = (drom_load_addr - drom_load_addr_aligned) + drom_size;
|
|
#if CONFIG_IDF_TARGET_ESP32
|
|
uint32_t drom_page_count = (drom_size + SPI_FLASH_MMU_PAGE_SIZE - 1) / SPI_FLASH_MMU_PAGE_SIZE;
|
|
rc = cache_flash_mmu_set(0, 0, drom_load_addr_aligned, drom_addr_aligned, 64, drom_page_count);
|
|
ESP_EARLY_LOGV(TAG, "rc=%d", rc);
|
|
rc = cache_flash_mmu_set(1, 0, drom_load_addr_aligned, drom_addr_aligned, 64, drom_page_count);
|
|
ESP_EARLY_LOGV(TAG, "rc=%d", rc);
|
|
ESP_EARLY_LOGV(TAG, "after mapping rodata, starting from paddr=0x%08" PRIx32 " and vaddr=0x%08" PRIx32 ", 0x%" PRIx32 " bytes are mapped", drom_addr_aligned, drom_load_addr_aligned, drom_page_count * SPI_FLASH_MMU_PAGE_SIZE);
|
|
#else
|
|
uint32_t actual_mapped_len = 0;
|
|
if (s_flash_seg_needs_map(drom_load_addr_aligned)) {
|
|
mmu_hal_map_region(0, MMU_TARGET_FLASH0, drom_load_addr_aligned, drom_addr_aligned, drom_size, &actual_mapped_len);
|
|
ESP_EARLY_LOGV(TAG, "after mapping rodata, starting from paddr=0x%08" PRIx32 " and vaddr=0x%08" PRIx32 ", 0x%" PRIx32 " bytes are mapped", drom_addr_aligned, drom_load_addr_aligned, actual_mapped_len);
|
|
}
|
|
//we use the MMU_LL_END_DROM_ENTRY_ID mmu entry as a map page for app to find the boot partition
|
|
mmu_hal_map_region(0, MMU_TARGET_FLASH0, MMU_LL_END_DROM_ENTRY_VADDR, drom_addr_aligned, CONFIG_MMU_PAGE_SIZE, &actual_mapped_len);
|
|
ESP_EARLY_LOGV(TAG, "mapped one page of the rodata, from paddr=0x%08" PRIx32 " and vaddr=0x%08" PRIx32 ", 0x%" PRIx32 " bytes are mapped", drom_addr_aligned, drom_load_addr_aligned, actual_mapped_len);
|
|
#endif
|
|
|
|
//-----------------------MAP IROM--------------------------
|
|
uint32_t irom_load_addr_aligned = irom_load_addr & MMU_FLASH_MASK;
|
|
uint32_t irom_addr_aligned = irom_addr & MMU_FLASH_MASK;
|
|
ESP_EARLY_LOGV(TAG, "text starts from paddr=0x%08" PRIx32 ", vaddr=0x%08" PRIx32 ", size=0x%" PRIx32, irom_addr, irom_load_addr, irom_size);
|
|
//The addr is aligned, so we add the mask off length to the size, to make sure the corresponding buses are enabled.
|
|
irom_size = (irom_load_addr - irom_load_addr_aligned) + irom_size;
|
|
#if CONFIG_IDF_TARGET_ESP32
|
|
uint32_t irom_page_count = (irom_size + SPI_FLASH_MMU_PAGE_SIZE - 1) / SPI_FLASH_MMU_PAGE_SIZE;
|
|
rc = cache_flash_mmu_set(0, 0, irom_load_addr_aligned, irom_addr_aligned, 64, irom_page_count);
|
|
ESP_EARLY_LOGV(TAG, "rc=%d", rc);
|
|
rc = cache_flash_mmu_set(1, 0, irom_load_addr_aligned, irom_addr_aligned, 64, irom_page_count);
|
|
ESP_LOGV(TAG, "rc=%d", rc);
|
|
ESP_EARLY_LOGV(TAG, "after mapping text, starting from paddr=0x%08" PRIx32 " and vaddr=0x%08" PRIx32 ", 0x%" PRIx32 " bytes are mapped", irom_addr_aligned, irom_load_addr_aligned, irom_page_count * SPI_FLASH_MMU_PAGE_SIZE);
|
|
#else
|
|
if (s_flash_seg_needs_map(irom_load_addr_aligned)) {
|
|
mmu_hal_map_region(0, MMU_TARGET_FLASH0, irom_load_addr_aligned, irom_addr_aligned, irom_size, &actual_mapped_len);
|
|
ESP_EARLY_LOGW(TAG, "after mapping text, starting from paddr=0x%08" PRIx32 " and vaddr=0x%08" PRIx32 ", 0x%" PRIx32 " bytes are mapped", irom_addr_aligned, irom_load_addr_aligned, actual_mapped_len);
|
|
}
|
|
#endif
|
|
|
|
//----------------------Enable corresponding buses----------------
|
|
cache_bus_mask_t bus_mask = cache_ll_l1_get_bus(0, drom_load_addr_aligned, drom_size);
|
|
cache_ll_l1_enable_bus(0, bus_mask);
|
|
bus_mask = cache_ll_l1_get_bus(0, irom_load_addr_aligned, irom_size);
|
|
cache_ll_l1_enable_bus(0, bus_mask);
|
|
|
|
#if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE
|
|
bus_mask = cache_ll_l1_get_bus(1, drom_load_addr_aligned, drom_size);
|
|
cache_ll_l1_enable_bus(1, bus_mask);
|
|
bus_mask = cache_ll_l1_get_bus(1, irom_load_addr_aligned, irom_size);
|
|
cache_ll_l1_enable_bus(1, bus_mask);
|
|
#endif
|
|
|
|
//----------------------Enable Cache----------------
|
|
#if CONFIG_IDF_TARGET_ESP32
|
|
// Application will need to do Cache_Flush(1) and Cache_Read_Enable(1)
|
|
Cache_Read_Enable(0);
|
|
#else
|
|
cache_hal_enable(CACHE_LL_LEVEL_EXT_MEM, CACHE_TYPE_ALL);
|
|
#endif
|
|
|
|
ESP_LOGD(TAG, "start: 0x%08"PRIx32, entry_addr);
|
|
bootloader_atexit();
|
|
typedef void (*entry_t)(void) __attribute__((noreturn));
|
|
entry_t entry = ((entry_t) entry_addr);
|
|
|
|
// TODO: we have used quite a bit of stack at this point.
|
|
// use "movsp" instruction to reset stack back to where ROM stack starts.
|
|
(*entry)();
|
|
}
|
|
|
|
void bootloader_reset(void)
|
|
{
|
|
#ifdef BOOTLOADER_BUILD
|
|
bootloader_atexit();
|
|
esp_rom_delay_us(1000); /* Allow last byte to leave FIFO */
|
|
esp_rom_software_reset_system();
|
|
while (1) { } /* This line will never be reached, used to keep gcc happy */
|
|
#else
|
|
abort(); /* This function should really not be called from application code */
|
|
#endif
|
|
}
|
|
|
|
void bootloader_atexit(void)
|
|
{
|
|
#ifdef BOOTLOADER_BUILD
|
|
bootloader_console_deinit();
|
|
#else
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
esp_err_t bootloader_sha256_hex_to_str(char *out_str, const uint8_t *in_array_hex, size_t len)
|
|
{
|
|
if (out_str == NULL || in_array_hex == NULL || len == 0) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
for (size_t i = 0; i < len; i++) {
|
|
for (int shift = 0; shift < 2; shift++) {
|
|
uint8_t nibble = (in_array_hex[i] >> (shift ? 0 : 4)) & 0x0F;
|
|
if (nibble < 10) {
|
|
out_str[i * 2 + shift] = '0' + nibble;
|
|
} else {
|
|
out_str[i * 2 + shift] = 'a' + nibble - 10;
|
|
}
|
|
}
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
void bootloader_debug_buffer(const void *buffer, size_t length, const char *label)
|
|
{
|
|
#if CONFIG_BOOTLOADER_LOG_LEVEL >= 4
|
|
const uint8_t *bytes = (const uint8_t *)buffer;
|
|
const size_t output_len = MIN(length, 128);
|
|
char hexbuf[128 * 2 + 1];
|
|
|
|
bootloader_sha256_hex_to_str(hexbuf, bytes, output_len);
|
|
|
|
hexbuf[output_len * 2] = '\0';
|
|
ESP_LOGD(TAG, "%s: %s", label, hexbuf);
|
|
#else
|
|
(void) buffer;
|
|
(void) length;
|
|
(void) label;
|
|
#endif
|
|
}
|
|
|
|
esp_err_t bootloader_sha256_flash_contents(uint32_t flash_offset, uint32_t len, uint8_t *digest)
|
|
{
|
|
|
|
if (digest == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
/* Handling firmware images larger than MMU capacity */
|
|
uint32_t mmu_free_pages_count = bootloader_mmap_get_free_pages();
|
|
bootloader_sha256_handle_t sha_handle = NULL;
|
|
|
|
sha_handle = bootloader_sha256_start();
|
|
if (sha_handle == NULL) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
while (len > 0) {
|
|
uint32_t mmu_page_offset = ((flash_offset & MMAP_ALIGNED_MASK) != 0) ? 1 : 0; /* Skip 1st MMU Page if it is already populated */
|
|
uint32_t partial_image_len = MIN(len, ((mmu_free_pages_count - mmu_page_offset) * SPI_FLASH_MMU_PAGE_SIZE)); /* Read the image that fits in the free MMU pages */
|
|
|
|
const void * image = bootloader_mmap(flash_offset, partial_image_len);
|
|
if (image == NULL) {
|
|
bootloader_sha256_finish(sha_handle, NULL);
|
|
return ESP_FAIL;
|
|
}
|
|
bootloader_sha256_data(sha_handle, image, partial_image_len);
|
|
bootloader_munmap(image);
|
|
|
|
flash_offset += partial_image_len;
|
|
len -= partial_image_len;
|
|
}
|
|
bootloader_sha256_finish(sha_handle, digest);
|
|
return ESP_OK;
|
|
}
|