flash_enctryption: enabled flash encryption example on esp32s2
bootloader: raise WDT overflow value providing sufficient interval to encrypt app partition
flash_ encrypt: Fixed the TODOs on flash encryption key generation for esp32s2
flash_encryption: added secure boot features to flash enctryption for esp32s2
bootloader: leave only esp32s2 compatible potentially insecure options on menuconfig.
flash_encryption: removed secure boot version 1 from esp32s2 encryption code
flash_encryption: added CONFIG_SECURE_FLASH_REQUIRE_ALREADY_ENABLED option for esp32s2
flash_encryption: fixed the count of left plaintext flash
flash_encryption: disable dcache and icache download when using encryption in release mode
flash_encryption: add cache potentally insecure options for s2 chips
flash_encryption: fixed bug which bricked some chips in relase mode
This commit updates the watchdog timers (MWDT and RWDT)
in the following ways:
- Add seprate LL for MWDT and RWDT.
- Add a combined WDT HAL for all Watchdog Timers
- Update int_wdt.c and task_wdt.c to use WDT HAL
- Remove most dependencies on LL or direct register access
in other components. They will now use the WDT HAL
- Update use of watchdogs (including RTC WDT) in bootloader and
startup code to use the HAL layer.
Change the default bootloader config to -Os to save size.
This is a useful feature because it allows switching between debug
and release configs in the app without also needing to account for a
size change in the bootloader.
Goal is that multiple faults would be required to bypass a boot-time signature check.
- Also strengthens some address range checks for safe app memory addresses
- Change pre-enable logic to also check the bootloader signature before enabling SBV2 on ESP32
Add some additional checks for invalid sections:
- Sections only partially in DRAM or IRAM are invalid
- If a section is in D/IRAM, allow the possibility only some is in D/IRAM
- Only pass sections that are entirely in the same type of RTC memory region
and all ECDSA to be disabled if secure boot is not enabled
Previously if ECDSA disabled in config then secure_boot_signatures.c would
fail to build (whether or not secure boot was enabled).
To avoid breaking apps that might be using the signature scheme with custom OTA
without enabling secure boot signatures in config, this change just disables
this functionality if unavailable in mbedTLS config.
Possible fix for root cause of https://github.com/espressif/esp-idf/pull/3703
This saves time when waking up from deep sleep, but potentially decreases
the security of the system. If the application able to modify itself
(especially areas that are loaded into RAM) in flash while running
without crashing or is modifies the cached bits of information about
what was last booted from the bootloader, this could cause security
issues if the user does a "deep sleep reset" since the full validation
is skipped.
Signed-off-by: Tim Nordell <tim.nordell@nimbelink.com>
