mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
e3117404b4
Rust supports KASAN via LLVM, but prior to this patch, the flags aren't set properly. Suggested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Matthew Maurer <mmaurer@google.com> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Link: https://lore.kernel.org/r/20240820194910.187826-4-mmaurer@google.com [ Applied "SW_TAGS KASAN" nit. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
105 lines
3.7 KiB
Makefile
105 lines
3.7 KiB
Makefile
# 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-builtin
|
|
endif
|
|
|
|
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 := 1
|
|
else
|
|
stack_enable := 0
|
|
endif
|
|
|
|
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 := 10000
|
|
else
|
|
call_threshold := 0
|
|
endif
|
|
|
|
# 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=$(stack_enable) \
|
|
asan-instrument-allocas=1 \
|
|
asan-globals=1
|
|
|
|
# Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*()
|
|
# instead. With compilers that don't support this option, compiler-inserted
|
|
# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures.
|
|
kasan_params += asan-kernel-mem-intrinsic-prefix=1
|
|
|
|
endif # CONFIG_KASAN_GENERIC
|
|
|
|
ifdef CONFIG_KASAN_SW_TAGS
|
|
|
|
CFLAGS_KASAN := -fsanitize=kernel-hwaddress
|
|
|
|
# This sets flags that will enable SW_TAGS KASAN once enabled in Rust. These
|
|
# will not work today, and is guarded against in dependencies for CONFIG_RUST.
|
|
RUSTFLAGS_KASAN := -Zsanitizer=kernel-hwaddress \
|
|
-Zsanitizer-recover=kernel-hwaddress
|
|
|
|
ifdef CONFIG_KASAN_INLINE
|
|
kasan_params += hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET)
|
|
else
|
|
kasan_params += hwasan-instrument-with-calls=1
|
|
endif
|
|
|
|
kasan_params += hwasan-instrument-stack=$(stack_enable) \
|
|
hwasan-use-short-granules=0 \
|
|
hwasan-inline-all-checks=0
|
|
|
|
# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
|
|
ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y)
|
|
kasan_params += hwasan-kernel-mem-intrinsic-prefix=1
|
|
endif
|
|
|
|
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
|