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bootloader: Delay flashing firmware magic.

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Only flash firmware magic at the end.  Also simplified the code a bit.
This commit is contained in:
Jochen Hoenicke 2017-08-20 14:43:21 +02:00 committed by Pavol Rusnak
parent 6deb9fde32
commit b4a61d60c3
1 changed files with 26 additions and 24 deletions
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50
bootloader/usb.c
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@ -36,6 +36,8 @@
#include "ecdsa.h"
#include "secp256k1.h"
#define FIRMWARE_MAGIC "TRZR"
#define ENDPOINT_ADDRESS_IN (0x81)
#define ENDPOINT_ADDRESS_OUT (0x01)
@ -479,8 +481,16 @@ static void hid_rx_callback(usbd_device *dev, uint8_t ep)
layoutDialog(&bmp_icon_error, NULL, NULL, NULL, "Firmware is too big.", NULL, "Get official firmware", "from trezor.io/start", NULL, NULL);
return;
}
// check firmware magic
if (memcmp(p, FIRMWARE_MAGIC, 4) != 0) {
send_msg_failure(dev);
flash_state = STATE_END;
layoutDialog(&bmp_icon_error, NULL, NULL, NULL, "Wrong firmware header.", NULL, "Get official firmware", "from trezor.io/start", NULL, NULL);
return;
}
flash_state = STATE_FLASHING;
flash_pos = 0;
p += 4; // Don't flash firmware header yet.
flash_pos = 4;
wi = 0;
flash_unlock();
while (p < buf + 64) {
@ -560,31 +570,23 @@ static void hid_rx_callback(usbd_device *dev, uint8_t ep)
layoutProgress("INSTALLING ... Please wait", 1000);
uint8_t flags = *((uint8_t *)FLASH_META_FLAGS);
// check if to restore old storage area but only if signatures are ok
if ((flags & 0x01) && signatures_ok(NULL)) {
// copy new stuff
memcpy(meta_backup, (void *)FLASH_META_START, FLASH_META_DESC_LEN);
// replace "TRZR" in header with 0000 when hash not confirmed
if (!hash_check_ok) {
meta_backup[0] = 0;
meta_backup[1] = 0;
meta_backup[2] = 0;
meta_backup[3] = 0;
}
// erase storage
erase_metadata_sectors();
// restore metadata from backup
restore_metadata(meta_backup);
// wipe storage if signatures are not ok or the firmware flag isn't set.
if ((flags & 0x01) == 0 || !signatures_ok(NULL)) {
memset(meta_backup, 0, sizeof(meta_backup));
} else {
// replace "TRZR" in header with 0000 when hash not confirmed
if (!hash_check_ok) {
// no need to erase, because we are just erasing bits
flash_unlock();
flash_program_word(FLASH_META_START, 0x00000000);
flash_lock();
}
}
// copy new firmware header
memcpy(meta_backup, (void *)FLASH_META_START, FLASH_META_DESC_LEN);
// write "TRZR" in header only when hash was confirmed
if (hash_check_ok) {
memcpy(meta_backup, FIRMWARE_MAGIC, 4);
} else {
memset(meta_backup, 0, 4);
}
// no need to erase, because we are not changing any already flashed byte.
restore_metadata(meta_backup);
memset(meta_backup, 0, sizeof(meta_backup));
flash_state = STATE_END;
if (hash_check_ok) {
layoutDialog(&bmp_icon_ok, NULL, NULL, NULL, "New firmware", "successfully installed.", NULL, "You may now", "unplug your TREZOR.", NULL);