# SPDX-License-Identifier: GPL-2.0 ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX# Safe for compiler to generate meminstrinsic calls in uninstrumented files.CFLAGS_KASAN_NOSANITIZE :=else# Don't let compiler generate memintrinsic calls in uninstrumented files# because they are instrumented.CFLAGS_KASAN_NOSANITIZE := -fno-builtinendif KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))rustc-param = $(call rustc-option, -Cllvm-args=-$(1),) check-args = $(foreach arg,$(2),$(call $(1),$(arg))) kasan_params := ifdef CONFIG_KASAN_STACK	stack_enable := 1else	stack_enable := 0endif ifdef CONFIG_KASAN_GENERIC ifdef CONFIG_KASAN_INLINE	# When the number of memory accesses in a function is less than this	# call threshold number, the compiler will use inline instrumentation.	# 10000 is chosen offhand as a sufficiently large number to make all	# kernel functions to be instrumented inline.	call_threshold := 10000else	call_threshold := 0endif # First, enable -fsanitize=kernel-address together with providing the shadow# mapping offset, as for GCC, -fasan-shadow-offset fails without -fsanitize# (GCC accepts the shadow mapping offset via -fasan-shadow-offset instead of# a --param like the other KASAN parameters).# Instead of ifdef-checking the compiler, rely on cc-option.CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \		-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \		$(call cc-option, -fsanitize=kernel-address \		-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET))) # The minimum supported `rustc` version has a minimum supported LLVM# version late enough that we can assume support for -asan-mapping-offset.RUSTFLAGS_KASAN := -Zsanitizer=kernel-address \		   -Zsanitizer-recover=kernel-address \		   -Cllvm-args=-asan-mapping-offset=$(KASAN_SHADOW_OFFSET) # Now, add other parameters enabled similarly in GCC, Clang, and rustc.# As some of them are not supported by older compilers, these will be filtered# through `cc-param` or `rust-param` as applicable.kasan_params += asan-instrumentation-with-call-threshold=$(call_threshold) \		asan-stack=$(stack_enable) \		asan-instrument-allocas=1 \		asan-globals=1 # Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*()# instead. With compilers that don't support this option, compiler-inserted# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures.kasan_params += asan-kernel-mem-intrinsic-prefix=1 endif # CONFIG_KASAN_GENERIC ifdef CONFIG_KASAN_SW_TAGS CFLAGS_KASAN := -fsanitize=kernel-hwaddress RUSTFLAGS_KASAN := -Zsanitizer=kernel-hwaddress \		   -Zsanitizer-recover=kernel-hwaddress ifdef CONFIG_KASAN_INLINE	kasan_params += hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)else	kasan_params += hwasan-instrument-with-calls=1endif kasan_params += hwasan-instrument-stack=$(stack_enable) \		hwasan-use-short-granules=0 \		hwasan-inline-all-checks=0 # Instrument memcpy/memset/memmove calls by using instrumented __(hw)asan_mem*().ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX	ifdef CONFIG_CC_IS_GCC		kasan_params += asan-kernel-mem-intrinsic-prefix=1	else		kasan_params += hwasan-kernel-mem-intrinsic-prefix=1	endifendif # CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX endif # CONFIG_KASAN_SW_TAGS # Add all as-supported KASAN LLVM parameters requested by the configuration.CFLAGS_KASAN += $(call check-args, cc-param, $(kasan_params)) ifdef CONFIG_RUST	# Avoid calling `rustc-param` unless Rust is enabled.	RUSTFLAGS_KASAN += $(call check-args, rustc-param, $(kasan_params))endif # CONFIG_RUST export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE RUSTFLAGS_KASAN