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bootloader: Support for skipping validation upon wake from deep sleep

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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>
This commit is contained in:
Tim Nordell
2019-04-12 15:32:47 -05:00
committed by bot
parent 82984f0539
commit 43393cf4d1
5 changed files with 175 additions and 74 deletions
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8
components/esp32/ld/esp32.ld
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@@ -21,6 +21,12 @@
#define CONFIG_BT_RESERVE_DRAM 0
#endif
#if defined(CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP)
#define ESP_BOOTLOADER_RESERVE_RTC (CONFIG_BOOTLOADER_RESERVE_RTC_SIZE)
#else
#define ESP_BOOTLOADER_RESERVE_RTC 0
#endif
#if defined(CONFIG_ESP32_USE_FIXED_STATIC_RAM_SIZE)
ASSERT((CONFIG_ESP32_FIXED_STATIC_RAM_SIZE <= 0x2c200),
@@ -74,7 +80,7 @@ MEMORY
rtc_iram_seg(RWX) : org = 0x400C0000, len = 0x2000
/* RTC fast memory (same block as above), viewed from data bus */
rtc_data_seg(RW) : org = 0x3ff80000, len = 0x2000
rtc_data_seg(RW) : org = 0x3ff80000, len = 0x2000 - ESP_BOOTLOADER_RESERVE_RTC
/* RTC slow memory (data accessible). Persists over deep sleep.