OVMS3-idf/components/bootloader/subproject/main/ld/esp32/bootloader.ld
Angus Gratton d40c69375c bootloader: Add fault injection resistance to Secure Boot bootloader verification
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
2020-02-27 14:37:19 +05:30

170 lines
5 KiB
Text

/*
Linker file used to link the bootloader.
*/
/* Simplified memory map for the bootloader
The main purpose is to make sure the bootloader can load into main memory
without overwriting itself.
*/
MEMORY
{
/* IRAM POOL1, used for APP CPU cache. Bootloader runs from here during the final stage of loading the app because APP CPU is still held in reset, the main app enables APP CPU cache */
iram_loader_seg (RWX) : org = 0x40078000, len = 0x8000 /* 32KB, APP CPU cache */
/* 63kB, IRAM. We skip the first 1k to prevent the entry point being
placed into the same range as exception vectors in the app.
This leads to idf_monitor decoding ROM bootloader "entry 0x40080xxx"
message as one of the exception vectors, which looks scary to users.
*/
iram_seg (RWX) : org = 0x40080400, len = 0xfc00
/* 64k at the end of DRAM, after ROM bootloader stack */
dram_seg (RW) : org = 0x3FFF0000, len = 0x10000
}
/* Default entry point: */
ENTRY(call_start_cpu0);
SECTIONS
{
.iram_loader.text :
{
. = ALIGN (16);
_loader_text_start = ABSOLUTE(.);
*(.stub .gnu.warning .gnu.linkonce.literal.* .gnu.linkonce.t.*.literal .gnu.linkonce.t.*)
*(.iram1 .iram1.*) /* catch stray IRAM_ATTR */
*liblog.a:(.literal .text .literal.* .text.*)
*libgcc.a:(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_clock.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_common.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_flash.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_random.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_efuse_esp32.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_utility.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:bootloader_sha.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:esp_image_format.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:flash_encrypt.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:flash_partitions.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:secure_boot.*(.literal .text .literal.* .text.*)
*libbootloader_support.a:secure_boot_signatures.*(.literal .text .literal.* .text.*)
*libmicro-ecc.a:*.*(.literal .text .literal.* .text.*)
*libspi_flash.a:*.*(.literal .text .literal.* .text.*)
*libsoc.a:rtc_wdt.*(.literal .text .literal.* .text.*)
*libsoc.a:rtc_clk.*(.literal .text .literal.* .text.*)
*libefuse.a:*.*(.literal .text .literal.* .text.*)
*(.fini.literal)
*(.fini)
*(.gnu.version)
_loader_text_end = ABSOLUTE(.);
} > iram_loader_seg
.iram.text :
{
. = ALIGN (16);
*(.entry.text)
*(.init.literal)
*(.init)
} > iram_seg
/* Shared RAM */
.dram0.bss (NOLOAD) :
{
. = ALIGN (8);
_dram_start = ABSOLUTE(.);
_bss_start = ABSOLUTE(.);
*(.dynsbss)
*(.sbss)
*(.sbss.*)
*(.gnu.linkonce.sb.*)
*(.scommon)
*(.sbss2)
*(.sbss2.*)
*(.gnu.linkonce.sb2.*)
*(.dynbss)
*(.bss)
*(.bss.*)
*(.gnu.linkonce.b.*)
*(COMMON)
. = ALIGN (8);
_bss_end = ABSOLUTE(.);
} >dram_seg
.dram0.data :
{
_data_start = ABSOLUTE(.);
*(.data)
*(.data.*)
*(.gnu.linkonce.d.*)
*(.data1)
*(.sdata)
*(.sdata.*)
*(.gnu.linkonce.s.*)
*(.sdata2)
*(.sdata2.*)
*(.gnu.linkonce.s2.*)
*(.jcr)
_data_end = ABSOLUTE(.);
} >dram_seg
.dram0.rodata :
{
_rodata_start = ABSOLUTE(.);
*(.rodata)
*(.rodata.*)
*(.gnu.linkonce.r.*)
*(.rodata1)
__XT_EXCEPTION_TABLE_ = ABSOLUTE(.);
*(.xt_except_table)
*(.gcc_except_table)
*(.gnu.linkonce.e.*)
*(.gnu.version_r)
*(.eh_frame)
. = (. + 3) & ~ 3;
/* C++ constructor and destructor tables, properly ordered: */
__init_array_start = ABSOLUTE(.);
KEEP (*crtbegin.*(.ctors))
KEEP (*(EXCLUDE_FILE (*crtend.*) .ctors))
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
__init_array_end = ABSOLUTE(.);
KEEP (*crtbegin.*(.dtors))
KEEP (*(EXCLUDE_FILE (*crtend.*) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
/* C++ exception handlers table: */
__XT_EXCEPTION_DESCS_ = ABSOLUTE(.);
*(.xt_except_desc)
*(.gnu.linkonce.h.*)
__XT_EXCEPTION_DESCS_END__ = ABSOLUTE(.);
*(.xt_except_desc_end)
*(.dynamic)
*(.gnu.version_d)
_rodata_end = ABSOLUTE(.);
/* Literals are also RO data. */
_lit4_start = ABSOLUTE(.);
*(*.lit4)
*(.lit4.*)
*(.gnu.linkonce.lit4.*)
_lit4_end = ABSOLUTE(.);
. = ALIGN(4);
_dram_end = ABSOLUTE(.);
} >dram_seg
.iram.text :
{
_stext = .;
_text_start = ABSOLUTE(.);
*(.literal .text .literal.* .text.* .stub .gnu.warning .gnu.linkonce.literal.* .gnu.linkonce.t.*.literal .gnu.linkonce.t.*)
*(.iram .iram.*) /* catch stray IRAM_ATTR */
*(.fini.literal)
*(.fini)
*(.gnu.version)
_text_end = ABSOLUTE(.);
_etext = .;
} > iram_seg
}