mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-26 17:38:39 +00:00
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*
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* This file is part of the TREZOR project.
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*
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* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/cm3/scb.h>
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#include "bootloader.h"
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#include "buttons.h"
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#include "setup.h"
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#include "usb.h"
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#include "oled.h"
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#include "util.h"
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#include "signatures.h"
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#include "layout.h"
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#include "serialno.h"
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#include "rng.h"
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#ifdef APPVER
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#error Bootloader cannot be used in app mode
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#endif
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void show_unofficial_warning(void)
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{
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layoutDialog(DIALOG_ICON_WARNING, "Abort", "I'll take the risk", NULL, "WARNING!", NULL, "Unofficial firmware", "detected.", NULL, NULL);
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do {
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delay(100000);
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buttonUpdate();
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} while (!button.YesUp && !button.NoUp);
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if (button.YesUp) {
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return; // yes button was pressed -> return
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}
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layoutDialog(DIALOG_ICON_ERROR, NULL, NULL, NULL, "Unofficial firmware", "aborted.", NULL, "Unplug your TREZOR", "and see our support", "page at mytrezor.com");
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system_halt();
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}
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void load_app(void)
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{
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// jump to app
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SCB_VTOR = FLASH_APP_START; // & 0xFFFF;
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asm volatile("msr msp, %0"::"g" (*(volatile uint32_t *)FLASH_APP_START));
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(*(void (**)())(FLASH_APP_START + 4))();
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}
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void bootloader_loop(void)
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{
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static char serial[25];
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fill_serialno_fixed(serial);
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oledDrawBitmap(0, 0, &bmp_logo64);
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oledDrawString(52, 0, "TREZOR");
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oledDrawString(52, 20, "Serial No.");
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oledDrawString(52, 40, serial + 12); // second part of serial
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serial[12] = 0;
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oledDrawString(52, 30, serial); // first part of serial
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oledDrawStringRight(OLED_WIDTH - 1, OLED_HEIGHT - 8, "BLv" VERSTR(VERSION_MAJOR) "." VERSTR(VERSION_MINOR) "." VERSTR(VERSION_PATCH));
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oledRefresh();
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usbInit();
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usbLoop();
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}
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void check_firmware_sanity(void)
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{
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int broken = 0;
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if (memcmp((void *)FLASH_META_MAGIC, "TRZR", 4)) { // magic does not match
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broken++;
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}
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if (*((uint32_t *)FLASH_META_CODELEN) < 4096) { // firmware reports smaller size than 4kB
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broken++;
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}
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if (*((uint32_t *)FLASH_META_CODELEN) > FLASH_TOTAL_SIZE - (FLASH_APP_START - FLASH_ORIGIN)) { // firmware reports bigger size than flash size
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broken++;
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}
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if (broken) {
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layoutDialog(DIALOG_ICON_ERROR, NULL, NULL, NULL, "Firmware appears", "to be broken.", NULL, "Unplug your TREZOR", "and see our support", "page at mytrezor.com");
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system_halt();
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}
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}
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uint32_t __stack_chk_guard;
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void __attribute__((noreturn)) __stack_chk_fail(void)
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{
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layoutDialog(DIALOG_ICON_ERROR, NULL, NULL, NULL, "Stack smashing", "detected.", NULL, "Please unplug", "the device.", NULL);
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for (;;) {} // loop forever
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}
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int main(void)
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{
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__stack_chk_guard = random32();
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setup();
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memory_protect();
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oledInit();
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// at least one button is unpressed
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uint16_t state = gpio_port_read(BTN_PORT);
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if ((state & BTN_PIN_YES) == BTN_PIN_YES || (state & BTN_PIN_NO) == BTN_PIN_NO) {
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check_firmware_sanity();
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oledClear();
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oledDrawBitmap(40, 0, &bmp_logo64_empty);
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oledRefresh();
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if (!signatures_ok()) {
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show_unofficial_warning();
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}
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load_app();
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}
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bootloader_loop();
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return 0;
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}
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