mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
36be5cba99
Where the compiler instruments meminstrinsics by generating calls to
__asan/__hwasan_ prefixed functions, let the compiler consider
memintrinsics as builtin again.
To do so, never override memset/memmove/memcpy if the compiler does the
correct instrumentation - even on !GENERIC_ENTRY architectures.
[elver@google.com: powerpc: don't rename memintrinsics if compiler adds prefixes]
Link: https://lore.kernel.org/all/20230224085942.1791837-1-elver@google.com/ [1]
Link: https://lkml.kernel.org/r/20230227094726.3833247-1-elver@google.com
Link: https://lkml.kernel.org/r/20230224085942.1791837-2-elver@google.com
Fixes: 69d4c0d321 ("entry, kasan, x86: Disallow overriding mem*() functions")
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jakub Jelinek <jakub@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
77 lines
2.4 KiB
Makefile
77 lines
2.4 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)))
|
|
|
|
ifdef CONFIG_KASAN_STACK
|
|
stack_enable := 1
|
|
else
|
|
stack_enable := 0
|
|
endif
|
|
|
|
ifdef CONFIG_KASAN_GENERIC
|
|
|
|
ifdef CONFIG_KASAN_INLINE
|
|
call_threshold := 10000
|
|
else
|
|
call_threshold := 0
|
|
endif
|
|
|
|
CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
|
|
|
|
# -fasan-shadow-offset fails without -fsanitize
|
|
CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
|
|
-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
|
|
$(call cc-option, -fsanitize=kernel-address \
|
|
-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
|
|
|
|
ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
|
|
CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
|
|
else
|
|
# Now add all the compiler specific options that are valid standalone
|
|
CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
|
|
$(call cc-param,asan-globals=1) \
|
|
$(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
|
|
$(call cc-param,asan-instrument-allocas=1)
|
|
endif
|
|
|
|
CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
|
|
|
|
# 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.
|
|
CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)
|
|
|
|
endif # CONFIG_KASAN_GENERIC
|
|
|
|
ifdef CONFIG_KASAN_SW_TAGS
|
|
|
|
ifdef CONFIG_KASAN_INLINE
|
|
instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
|
|
else
|
|
instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
|
|
endif
|
|
|
|
CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
|
|
$(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
|
|
$(call cc-param,hwasan-use-short-granules=0) \
|
|
$(call cc-param,hwasan-inline-all-checks=0) \
|
|
$(instrumentation_flags)
|
|
|
|
# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
|
|
CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
|
|
|
|
endif # CONFIG_KASAN_SW_TAGS
|
|
|
|
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
|