3dfdc2750c
In subsequent patches, mark portions of the early C code will be marked as __init. Unfortunarely, __init implies __latent_entropy, and this would result in the early C code being instrumented in an unsafe manner. Disable the latent entropy plugin for the early C code. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20231129111555.3594833-44-ardb@google.com Signed-off-by: Will Deacon <will@kernel.org>
36 lines
1.2 KiB
Makefile
36 lines
1.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Copyright 2022 Google LLC
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KBUILD_CFLAGS := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) -fpie \
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-Os -DDISABLE_BRANCH_PROFILING $(DISABLE_STACKLEAK_PLUGIN) \
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$(DISABLE_LATENT_ENTROPY_PLUGIN) \
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$(call cc-option,-mbranch-protection=none) \
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-I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \
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-include $(srctree)/include/linux/hidden.h \
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-D__DISABLE_EXPORTS -ffreestanding -D__NO_FORTIFY \
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-fno-asynchronous-unwind-tables -fno-unwind-tables \
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$(call cc-option,-fno-addrsig)
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# remove SCS flags from all objects in this directory
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KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
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# disable LTO
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KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS))
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GCOV_PROFILE := n
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KASAN_SANITIZE := n
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KCSAN_SANITIZE := n
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UBSAN_SANITIZE := n
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KCOV_INSTRUMENT := n
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$(obj)/%.pi.o: OBJCOPYFLAGS := --prefix-symbols=__pi_ \
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--remove-section=.note.gnu.property \
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--prefix-alloc-sections=.init
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$(obj)/%.pi.o: $(obj)/%.o FORCE
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$(call if_changed,objcopy)
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$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE
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$(call if_changed_rule,cc_o_c)
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obj-y := kaslr_early.pi.o lib-fdt.pi.o lib-fdt_ro.pi.o
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extra-y := $(patsubst %.pi.o,%.o,$(obj-y))
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