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trezor-firmware/legacy/memory.c
2024-02-29 23:05:56 +01:00

125 lines
4.4 KiB
C

/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "memory.h"
#include <libopencm3/stm32/flash.h>
#include <stdint.h>
#include "blake2s.h"
#include "flash.h"
#include "layout.h"
#include "sha2.h"
#define FLASH_OPTION_BYTES_1 (*(const uint64_t *)0x1FFFC000)
#define FLASH_OPTION_BYTES_2 (*(const uint64_t *)0x1FFFC008)
void memory_protect(void) {
#if PRODUCTION
#if BOOTLOADER_QA
#error BOOTLOADER_QA must be built with PRODUCTION=0
#endif
// Reference STM32F205 Flash programming manual revision 5
// http://www.st.com/resource/en/programming_manual/cd00233952.pdf Section 2.6
// Option bytes
// set RDP level 2 WRP for sectors 0 and
// 1 flash option control register matches
if (((FLASH_OPTION_BYTES_1 & 0xFFEC) == 0xCCEC) &&
((FLASH_OPTION_BYTES_2 & 0xFFF) == 0xFFC) &&
(FLASH_OPTCR == 0x0FFCCCED)) {
return; // already set up correctly - bail out
}
flash_unlock();
for (int i = FLASH_STORAGE_SECTOR_FIRST; i <= FLASH_STORAGE_SECTOR_LAST;
i++) {
flash_erase_sector(i, FLASH_CR_PROGRAM_X32);
}
flash_lock();
flash_unlock_option_bytes();
// Section 2.8.6 Flash option control register (FLASH_OPTCR)
// Bits 31:28 Reserved, must be kept cleared.
// Bits 27:16 nWRP: Not write protect: write protect bootloader code in
// flash main memory sectors 0 and 1 (Section 2.3; table 2) Bits 15:8 RDP:
// Read protect: level 2 chip read protection active Bits 7:5 USER: User
// option bytes: no reset on standby, no reset on stop, software watchdog
// Bit 4 Reserved, must be kept cleared.
// Bits 3:2 BOR_LEV: BOR reset Level: BOR off
// Bit 1 OPTSTRT: Option start: ignored by flash_program_option_bytes
// Bit 0 OPTLOCK: Option lock: ignored by flash_program_option_bytes
flash_program_option_bytes(0x0FFCCCEC);
flash_lock_option_bytes();
#endif
}
// Remove write-protection on all flash sectors.
//
// This is an undocumented feature/bug of STM32F205/F405 microcontrollers,
// where flash controller reads its write protection bits from FLASH_OPTCR
// register not from OPTION_BYTES, rendering write protection useless.
// This behaviour is fixed in future designs of flash controller used for
// example in STM32F427, where the protection bits are read correctly
// from OPTION_BYTES and not form FLASH_OPCTR register.
//
// Read protection is set to level 2.
void memory_write_unlock(void) {
#if PRODUCTION
#if BOOTLOADER_QA
#error BOOTLOADER_QA must be built with PRODUCTION=0
#endif
flash_unlock_option_bytes();
flash_program_option_bytes(0x0FFFCCEC);
flash_lock_option_bytes();
#endif
}
int memory_bootloader_hash(uint8_t *hash) {
sha256_Raw(FLASH_PTR(FLASH_BOOT_START), FLASH_BOOT_LEN, hash);
sha256_Raw(hash, 32, hash);
return 32;
}
int memory_firmware_hash(const uint8_t *challenge, uint32_t challenge_size,
void (*progress_callback)(uint32_t, uint32_t),
uint8_t hash[BLAKE2S_DIGEST_LENGTH]) {
BLAKE2S_CTX ctx;
if (challenge_size != 0) {
if (blake2s_InitKey(&ctx, BLAKE2S_DIGEST_LENGTH, challenge,
challenge_size) != 0) {
return 1;
}
} else {
blake2s_Init(&ctx, BLAKE2S_DIGEST_LENGTH);
}
for (int i = FLASH_CODE_SECTOR_FIRST; i <= FLASH_CODE_SECTOR_LAST; i++) {
uint32_t size = flash_sector_size(i, 1);
const void *data = flash_get_address(i, 0, size);
if (data == NULL) {
return 1;
}
blake2s_Update(&ctx, data, size);
if (progress_callback != NULL) {
progress_callback(i - FLASH_CODE_SECTOR_FIRST,
FLASH_CODE_SECTOR_LAST - FLASH_CODE_SECTOR_FIRST);
}
}
return blake2s_Final(&ctx, hash, BLAKE2S_DIGEST_LENGTH);
}