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fix(core): clear memory when not going to use copy firmware header for bootloader

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This commit is contained in:
Ondrej Mikle 2023-08-16 16:31:04 +02:00
parent c0c544b7d8
commit 75a148e414
3 changed files with 20 additions and 5 deletions
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11
core/embed/firmware/main.c
View File

@ -88,9 +88,6 @@
// from util.s
extern void shutdown_privileged(void);
// from linker script
extern uint8_t firmware_header_start;
int main(void) {
random_delays_init();
@ -247,6 +244,7 @@ void copy_image_header_for_bootloader(const uint8_t *image_header) {
void SVC_C_Handler(uint32_t *stack) {
uint8_t svc_number = ((uint8_t *)stack[6])[-2];
bool clear_firmware_header = true;
switch (svc_number) {
case SVC_ENABLE_IRQ:
HAL_NVIC_EnableIRQ(stack[0]);
@ -269,11 +267,14 @@ void SVC_C_Handler(uint32_t *stack) {
break;
case SVC_REBOOT_COPY_IMAGE_HEADER:
copy_image_header_for_bootloader((uint8_t *)stack[0]);
clear_firmware_header = false;
// break is omitted here because we want to continue to reboot below
case SVC_REBOOT_TO_BOOTLOADER:
// if not going from copy image header & reboot, clean preventively this part of CCMRAM
if (clear_firmware_header) {
explicit_bzero(&firmware_header_start, IMAGE_HEADER_SIZE);
}
ensure_compatible_settings();
mpu_config_bootloader();
__asm__ volatile("msr control, %0" ::"r"(0x0));
__asm__ volatile("isb");
// See stack layout in

6
core/embed/trezorhal/common.h
View File

@ -53,6 +53,12 @@
#define STAY_IN_BOOTLOADER_FLAG 0x0FC35A96
// from linker script
extern uint8_t firmware_header_start;
extern uint8_t ccmram_start;
extern uint8_t ccmram_end;
void __attribute__((noreturn)) trezor_shutdown(void);
void __attribute__((noreturn))

8
core/embed/trezorhal/stm32f4/supervise.h
View File

@ -7,10 +7,15 @@
#define SVC_REBOOT_TO_BOOTLOADER 5
#define SVC_REBOOT_COPY_IMAGE_HEADER 6
#include <string.h>
#include "common.h"
#include "image.h"
// from util.s
extern void shutdown_privileged(void);
extern void reboot_to_bootloader(void);
extern void copy_image_header_for_bootloader(const uint8_t *image_header);
extern void ensure_compatible_settings(void);
static inline uint32_t is_mode_unprivileged(void) {
uint32_t r0;
@ -62,9 +67,11 @@ static inline void svc_shutdown(void) {
}
static inline void svc_reboot_to_bootloader(void) {
explicit_bzero(&firmware_header_start, IMAGE_HEADER_SIZE);
if (is_mode_unprivileged() && !is_mode_handler()) {
__asm__ __volatile__("svc %0" ::"i"(SVC_REBOOT_TO_BOOTLOADER) : "memory");
} else {
ensure_compatible_settings();
reboot_to_bootloader();
}
}
@ -76,6 +83,7 @@ static inline void svc_reboot_copy_image_header(const uint8_t *image_address) {
: "memory");
} else {
copy_image_header_for_bootloader(image_address);
ensure_compatible_settings();
reboot_to_bootloader();
}
}