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efi/libstub: Disable kernel stack erasing in the common flags

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Every architecture that builds the stub now adds $(DISABLE_KSTACK_ERASE)
to its own flags, so add it once to the flags they share instead.

Signed-off-by: Kees Cook <kees@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Kees Cook 2026-10-06 13:42:23 -07:00 committed by Ard Biesheuvel
parent 7aea1470a4
commit 7762562c92
1 changed files with 7 additions and 10 deletions
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17
drivers/firmware/efi/libstub/Makefile
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@ -19,22 +19,18 @@ cflags-$(CONFIG_X86) := $(filter-out -mcmodel=kernel \
$(PADDING_CFLAGS), $(cflags-y))
cflags-$(CONFIG_X86_32) += -march=i386
cflags-$(CONFIG_X86_64) += -mcmodel=small
cflags-$(CONFIG_X86) += -fPIC $(DISABLE_KSTACK_ERASE)
cflags-$(CONFIG_X86) += -fPIC
# Nothing enables IBT while the stub runs, so ENDBR would only take space.
cflags-$(CONFIG_X86) += $(call cc-option,-fcf-protection=none)
# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly
# disable the stackleak plugin
cflags-$(CONFIG_ARM64) += -fpie $(DISABLE_KSTACK_ERASE) -ffixed-x18 \
-fno-unwind-tables -fno-asynchronous-unwind-tables
cflags-$(CONFIG_ARM64) += -fpie -ffixed-x18 -fno-unwind-tables \
-fno-asynchronous-unwind-tables
cflags-$(CONFIG_ARM) += -DEFI_HAVE_STRLEN -DEFI_HAVE_STRNLEN \
-DEFI_HAVE_MEMCHR -DEFI_HAVE_STRRCHR \
-DEFI_HAVE_STRCMP -fno-builtin -fpic \
$(call cc-option,-mno-single-pic-base) \
$(DISABLE_KSTACK_ERASE)
cflags-$(CONFIG_RISCV) += -fpic -DNO_ALTERNATIVE -mno-relax \
$(DISABLE_KSTACK_ERASE)
cflags-$(CONFIG_LOONGARCH) += -fpie $(DISABLE_KSTACK_ERASE)
$(call cc-option,-mno-single-pic-base)
cflags-$(CONFIG_RISCV) += -fpic -DNO_ALTERNATIVE -mno-relax
cflags-$(CONFIG_LOONGARCH) += -fpie
cflags-$(CONFIG_EFI_PARAMS_FROM_FDT) += -I$(srctree)/scripts/dtc/libfdt
@ -44,6 +40,7 @@ KBUILD_CFLAGS := $(subst $(CC_FLAGS_FTRACE),,$(cflags-y)) \
-D__NO_FORTIFY \
-ffreestanding \
-fno-stack-protector \
$(DISABLE_KSTACK_ERASE) \
$(call cc-option,-fno-addrsig) \
-D__DISABLE_EXPORTS