From 45dd403da851124412d32e3193c21de4a51d29da Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Tue, 18 Apr 2023 15:49:49 +0200 Subject: efi/zboot: arm64: Inject kernel code size symbol into the zboot payload The EFI zboot code is not built as part of the kernel proper, like the ordinary EFI stub, but still needs access to symbols that are defined only internally in the kernel, and are left unexposed deliberately to avoid creating ABI inadvertently that we're stuck with later. So capture the kernel code size of the kernel image, and inject it as an ELF symbol into the object that contains the compressed payload, where it will be accessible to zboot code that needs it. Signed-off-by: Ard Biesheuvel Acked-by: Mark Rutland --- drivers/firmware/efi/libstub/Makefile.zboot | 2 +- drivers/firmware/efi/libstub/zboot.lds | 7 +++++++ 2 files changed, 8 insertions(+), 1 deletion(-) (limited to 'drivers/firmware/efi/libstub') diff --git a/drivers/firmware/efi/libstub/Makefile.zboot b/drivers/firmware/efi/libstub/Makefile.zboot index 0a9dcc2b1373..1b101d9076fd 100644 --- a/drivers/firmware/efi/libstub/Makefile.zboot +++ b/drivers/firmware/efi/libstub/Makefile.zboot @@ -40,7 +40,7 @@ quiet_cmd_compwithsize = $(quiet_cmd_$(zboot-method-y)) $(obj)/vmlinuz: $(obj)/vmlinux.bin FORCE $(call if_changed,compwithsize) -OBJCOPYFLAGS_vmlinuz.o := -I binary -O $(EFI_ZBOOT_BFD_TARGET) \ +OBJCOPYFLAGS_vmlinuz.o := -I binary -O $(EFI_ZBOOT_BFD_TARGET) $(EFI_ZBOOT_OBJCOPY_FLAGS) \ --rename-section .data=.gzdata,load,alloc,readonly,contents $(obj)/vmlinuz.o: $(obj)/vmlinuz FORCE $(call if_changed,objcopy) diff --git a/drivers/firmware/efi/libstub/zboot.lds b/drivers/firmware/efi/libstub/zboot.lds index 93d33f68333b..ac8c0ef85158 100644 --- a/drivers/firmware/efi/libstub/zboot.lds +++ b/drivers/firmware/efi/libstub/zboot.lds @@ -2,6 +2,8 @@ ENTRY(__efistub_efi_zboot_header); +PROVIDE(zboot_code_size = ABSOLUTE(0)); + SECTIONS { .head : ALIGN(4096) { @@ -17,6 +19,11 @@ SECTIONS *(.gzdata) __efistub__gzdata_end = .; *(.rodata* .init.rodata* .srodata*) + + . = ALIGN(4); + __efistub_code_size = .; + LONG(zboot_code_size); + _etext = ALIGN(4096); . = _etext; } -- cgit v1.2.1