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58a3e08895
Additionally, always enable the partition MD5 check if flash encryption is on in Release mode. This ensures the partition table ciphertext has not been modified (CVE-2021-27926). The exception is pre-V3.1 ESP-IDF bootloaders and partition tables, which don't have support for the MD5 entry.
117 lines
4.6 KiB
C
117 lines
4.6 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "esp_err.h"
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#include "esp_types.h"
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#include "sdkconfig.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ESP_PARTITION_MAGIC 0x50AA
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#define ESP_PARTITION_MAGIC_MD5 0xEBEB
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#define PART_TYPE_APP 0x00
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#define PART_SUBTYPE_FACTORY 0x00
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#define PART_SUBTYPE_OTA_FLAG 0x10
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#define PART_SUBTYPE_OTA_MASK 0x0f
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#define PART_SUBTYPE_TEST 0x20
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#define PART_TYPE_DATA 0x01
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#define PART_SUBTYPE_DATA_OTA 0x00
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#define PART_SUBTYPE_DATA_RF 0x01
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#define PART_SUBTYPE_DATA_WIFI 0x02
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#define PART_SUBTYPE_DATA_NVS_KEYS 0x04
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#define PART_SUBTYPE_DATA_EFUSE_EM 0x05
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#define PART_TYPE_END 0xff
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#define PART_SUBTYPE_END 0xff
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#define PART_FLAG_ENCRYPTED (1<<0)
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/* The md5sum value is found this many bytes after the ESP_PARTITION_MAGIC_MD5 offset */
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#define ESP_PARTITION_MD5_OFFSET 16
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/* Pre-partition table fixed flash offsets */
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#define ESP_BOOTLOADER_DIGEST_OFFSET 0x0
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#define ESP_BOOTLOADER_OFFSET CONFIG_BOOTLOADER_OFFSET_IN_FLASH /* Offset of bootloader image. Has matching value in bootloader KConfig.projbuild file. */
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#define ESP_PARTITION_TABLE_OFFSET CONFIG_PARTITION_TABLE_OFFSET /* Offset of partition table. Backwards-compatible name.*/
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#define ESP_PARTITION_TABLE_MAX_LEN 0xC00 /* Maximum length of partition table data */
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#define ESP_PARTITION_TABLE_MAX_ENTRIES (ESP_PARTITION_TABLE_MAX_LEN / sizeof(esp_partition_info_t)) /* Maximum length of partition table data, including terminating entry */
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/// OTA_DATA states for checking operability of the app.
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typedef enum {
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ESP_OTA_IMG_NEW = 0x0U, /*!< Monitor the first boot. In bootloader this state is changed to ESP_OTA_IMG_PENDING_VERIFY. */
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ESP_OTA_IMG_PENDING_VERIFY = 0x1U, /*!< First boot for this app was. If while the second boot this state is then it will be changed to ABORTED. */
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ESP_OTA_IMG_VALID = 0x2U, /*!< App was confirmed as workable. App can boot and work without limits. */
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ESP_OTA_IMG_INVALID = 0x3U, /*!< App was confirmed as non-workable. This app will not selected to boot at all. */
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ESP_OTA_IMG_ABORTED = 0x4U, /*!< App could not confirm the workable or non-workable. In bootloader IMG_PENDING_VERIFY state will be changed to IMG_ABORTED. This app will not selected to boot at all. */
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ESP_OTA_IMG_UNDEFINED = 0xFFFFFFFFU, /*!< Undefined. App can boot and work without limits. */
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} esp_ota_img_states_t;
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/* OTA selection structure (two copies in the OTA data partition.)
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Size of 32 bytes is friendly to flash encryption */
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typedef struct {
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uint32_t ota_seq;
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uint8_t seq_label[20];
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uint32_t ota_state;
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uint32_t crc; /* CRC32 of ota_seq field only */
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} esp_ota_select_entry_t;
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typedef struct {
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uint32_t offset;
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uint32_t size;
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} esp_partition_pos_t;
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/* Structure which describes the layout of partition table entry.
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* See docs/partition_tables.rst for more information about individual fields.
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*/
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typedef struct {
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uint16_t magic;
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uint8_t type;
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uint8_t subtype;
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esp_partition_pos_t pos;
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uint8_t label[16];
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uint32_t flags;
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} esp_partition_info_t;
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/* @brief Verify the partition table
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*
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* @param partition_table Pointer to at least ESP_PARTITION_TABLE_MAX_ENTRIES of potential partition table data. (ESP_PARTITION_TABLE_MAX_LEN bytes.)
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* @param log_errors Log errors if the partition table is invalid.
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* @param num_partitions If result is ESP_OK, num_partitions is updated with total number of partitions (not including terminating entry).
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*
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* @return ESP_OK on success, ESP_ERR_INVALID_STATE if partition table is not valid.
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*/
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esp_err_t esp_partition_table_verify(const esp_partition_info_t *partition_table, bool log_errors, int *num_partitions);
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/**
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* Check whether the region on the main flash is safe to write.
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*
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* @param addr Start address of the region
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* @param size Size of the region
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*
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* @return true if the region is safe to write, otherwise false.
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*/
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bool esp_partition_main_flash_region_safe(size_t addr, size_t size);
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#ifdef __cplusplus
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}
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#endif
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