OVMS3-idf/components/partition_table/Makefile.projbuild
Angus Gratton 57b601ab7f secure boot: Pad to avoid data after the signature mapping into the address space
Because address space is mapped in 64KB pages, it was possible for unauthenticated data after the
app .bin to become mapped into the flash cache address space.

This problem is solved by 2 changes:

* "esptool elf2image --secure-pad" will pad the image so that the signature block ends close to the
  64KB boundary. Due to alignment constraints it will be 12 bytes too short after signing (but
  with flash encryption, these 12 bytes are still encrypted as part of the last block and can't be
  arbitrarily changed).
* By default, secure boot now requires all app partitions to be a multiple of 64KB in size.
2018-07-17 15:33:47 +10:00

92 lines
3.4 KiB
Makefile

#
# Partition table
#
# The partition table is not a real component that gets linked into
# the project. Instead, it is a standalone project to generate
# the partition table binary as part of the build process. This
# binary is then added to the list of files for esptool.py to flash.
#
.PHONY: partition_table partition_table-flash partition_table-clean partition_table_get_info
PARTITION_MD5_OPT :=
ifndef CONFIG_PARTITION_TABLE_MD5
PARTITION_MD5_OPT := "--disable-md5sum"
endif
PARTITION_FLASHSIZE_OPT :=
ifneq ("$(CONFIG_ESPTOOLPY_FLASHSIZE)", "")
PARTITION_FLASHSIZE_OPT := --flash-size $(CONFIG_ESPTOOLPY_FLASHSIZE)
endif
PARTITION_SECURE_OPT :=
ifdef CONFIG_SECURE_BOOT_ENABLED
ifndef CONFIG_SECURE_BOOT_ALLOW_SHORT_APP_PARTITION
PARTITION_SECURE_OPT += --secure
endif
endif
# Address of partition table
PARTITION_TABLE_OFFSET := $(CONFIG_PARTITION_TABLE_OFFSET)
PARTITION_TABLE_OFFSET_ARG := --offset $(PARTITION_TABLE_OFFSET)
GEN_ESP32PART := $(PYTHON) $(COMPONENT_PATH)/gen_esp32part.py -q $(PARTITION_MD5_OPT) $(PARTITION_FLASHSIZE_OPT) $(PARTITION_TABLE_OFFSET_ARG) $(PARTITION_SECURE_OPT)
GET_PART_INFO := $(COMPONENT_PATH)/parttool.py -q
# if CONFIG_PARTITION_TABLE_FILENAME is unset, means we haven't re-generated config yet...
ifneq ("$(CONFIG_PARTITION_TABLE_FILENAME)","")
ifndef PARTITION_TABLE_CSV_PATH
# Path to partition CSV file is relative to project path for custom
# partition CSV files, but relative to component dir otherwise.
PARTITION_TABLE_ROOT := $(call dequote,$(if $(CONFIG_PARTITION_TABLE_CUSTOM),$(PROJECT_PATH),$(COMPONENT_PATH)))
PARTITION_TABLE_CSV_PATH := $(call dequote,$(abspath $(PARTITION_TABLE_ROOT)/$(call dequote,$(CONFIG_PARTITION_TABLE_FILENAME))))
endif
PARTITION_TABLE_CSV_NAME := $(notdir $(PARTITION_TABLE_CSV_PATH))
PARTITION_TABLE_BIN := $(BUILD_DIR_BASE)/$(PARTITION_TABLE_CSV_NAME:.csv=.bin)
ifdef CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES
PARTITION_TABLE_BIN_UNSIGNED := $(PARTITION_TABLE_BIN:.bin=-unsigned.bin)
# add an extra signing step for secure partition table
$(PARTITION_TABLE_BIN): $(PARTITION_TABLE_BIN_UNSIGNED) $(SDKCONFIG_MAKEFILE) $(SECURE_BOOT_SIGNING_KEY)
$(ESPSECUREPY) sign_data --keyfile $(SECURE_BOOT_SIGNING_KEY) -o $@ $<
else
# secure bootloader disabled, both files are the same
PARTITION_TABLE_BIN_UNSIGNED := $(PARTITION_TABLE_BIN)
endif
$(PARTITION_TABLE_BIN_UNSIGNED): $(PARTITION_TABLE_CSV_PATH) $(SDKCONFIG_MAKEFILE)
@echo "Building partitions from $(PARTITION_TABLE_CSV_PATH)..."
$(GEN_ESP32PART) $< $@
all_binaries: $(PARTITION_TABLE_BIN) partition_table_get_info
partition_table_get_info: $(PARTITION_TABLE_BIN)
$(eval PHY_DATA_OFFSET:=$(shell $(GET_PART_INFO) --type data --subtype phy --offset $(PARTITION_TABLE_BIN)))
$(eval APP_OFFSET:=$(shell $(GET_PART_INFO) --default-boot-partition --offset $(PARTITION_TABLE_BIN)))
export APP_OFFSET
export PHY_DATA_OFFSET
PARTITION_TABLE_FLASH_CMD = $(ESPTOOLPY_SERIAL) write_flash $(PARTITION_TABLE_OFFSET) $(PARTITION_TABLE_BIN)
ESPTOOL_ALL_FLASH_ARGS += $(PARTITION_TABLE_OFFSET) $(PARTITION_TABLE_BIN)
partition_table: $(PARTITION_TABLE_BIN) partition_table_get_info
@echo "Partition table binary generated. Contents:"
@echo $(SEPARATOR)
$(GEN_ESP32PART) $<
@echo $(SEPARATOR)
@echo "Partition flashing command:"
@echo "$(PARTITION_TABLE_FLASH_CMD)"
partition_table-flash: $(PARTITION_TABLE_BIN)
@echo "Flashing partition table..."
$(PARTITION_TABLE_FLASH_CMD)
partition_table-clean:
rm -f $(PARTITION_TABLE_BIN)
clean: partition_table-clean
endif