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sept: prepare for reboot immediately

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This commit is contained in:
Michael Scire 2019-02-21 08:23:33 -08:00
parent 61b057c37d
commit b63061a505
3 changed files with 12 additions and 3 deletions
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7
sept/sept-secondary/src/main.c
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@ -57,6 +57,10 @@ static void exfiltrate_keys_and_reboot_if_needed(void) {
uint8_t *dec_se_state = (uint8_t *)0x4003F000; uint8_t *dec_se_state = (uint8_t *)0x4003F000;
if (!has_rebooted()) { if (!has_rebooted()) {
/* Prepare for a reboot before doing anything else. */
prepare_for_reboot_to_self();
set_has_rebooted(true);
/* Save the security engine context. */ /* Save the security engine context. */
se_get_regs()->_0x4 = 0x0; se_get_regs()->_0x4 = 0x0;
se_set_in_context_save_mode(true); se_set_in_context_save_mode(true);
@ -67,8 +71,7 @@ static void exfiltrate_keys_and_reboot_if_needed(void) {
for (size_t k = 0; k < 0x10; k++) { for (size_t k = 0; k < 0x10; k++) {
clear_aes_keyslot(k); clear_aes_keyslot(k);
} }
set_has_rebooted(true);
reboot_to_self(); reboot_to_self();
} else { } else {
/* Decrypt the security engine state. */ /* Decrypt the security engine state. */

7
sept/sept-secondary/src/utils.c
View file

@ -65,7 +65,7 @@ __attribute__((noreturn)) void pmc_reboot(uint32_t scratch0) {
} }
} }
__attribute__((noreturn)) void reboot_to_self(void) { void prepare_for_reboot_to_self(void) {
/* Patch SDRAM init to perform an SVC immediately after second write */ /* Patch SDRAM init to perform an SVC immediately after second write */
APBDEV_PMC_SCRATCH45_0 = 0x2E38DFFF; APBDEV_PMC_SCRATCH45_0 = 0x2E38DFFF;
APBDEV_PMC_SCRATCH46_0 = 0x6001DC28; APBDEV_PMC_SCRATCH46_0 = 0x6001DC28;
@ -77,6 +77,11 @@ __attribute__((noreturn)) void reboot_to_self(void) {
for (size_t i = 0; i < rebootstub_bin_size; i += sizeof(uint32_t)) { for (size_t i = 0; i < rebootstub_bin_size; i += sizeof(uint32_t)) {
write32le((void *)0x4003F000, i, read32le(rebootstub_bin, i)); write32le((void *)0x4003F000, i, read32le(rebootstub_bin, i));
} }
}
__attribute__((noreturn)) void reboot_to_self(void) {
/* Prep IRAM for reboot. */
prepare_for_reboot_to_self();
/* Trigger warm reboot. */ /* Trigger warm reboot. */
pmc_reboot(1 << 0); pmc_reboot(1 << 0);

1
sept/sept-secondary/src/utils.h
View file

@ -121,6 +121,7 @@ void hexdump(const void* data, size_t size, uintptr_t addrbase);
__attribute__((noreturn)) void watchdog_reboot(void); __attribute__((noreturn)) void watchdog_reboot(void);
__attribute__((noreturn)) void pmc_reboot(uint32_t scratch0); __attribute__((noreturn)) void pmc_reboot(uint32_t scratch0);
void prepare_for_reboot_to_self(void);
__attribute__((noreturn)) void reboot_to_self(void); __attribute__((noreturn)) void reboot_to_self(void);
__attribute__((noreturn)) void wait_for_button_and_reboot(void); __attribute__((noreturn)) void wait_for_button_and_reboot(void);