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 --- arch/arm64/boot/Makefile | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/arm64/boot/Makefile') diff --git a/arch/arm64/boot/Makefile b/arch/arm64/boot/Makefile index ae645fda90bc..1761f5972443 100644 --- a/arch/arm64/boot/Makefile +++ b/arch/arm64/boot/Makefile @@ -44,4 +44,7 @@ EFI_ZBOOT_BFD_TARGET := elf64-littleaarch64 EFI_ZBOOT_MACH_TYPE := ARM64 EFI_ZBOOT_FORWARD_CFI := $(CONFIG_ARM64_BTI_KERNEL) +EFI_ZBOOT_OBJCOPY_FLAGS = --add-symbol zboot_code_size=0x$(shell \ + $(NM) vmlinux|grep _kernel_codesize|cut -d' ' -f1) + include $(srctree)/drivers/firmware/efi/libstub/Makefile.zboot -- cgit