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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107# 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