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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
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ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX
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# Safe for compiler to generate meminstrinsic calls in uninstrumented files.
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CFLAGS_KASAN_NOSANITIZE :=
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else
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# Don't let compiler generate memintrinsic calls in uninstrumented files
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# because they are instrumented.
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CFLAGS_KASAN_NOSANITIZE := -fno-builtin
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endif
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KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
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cc-param = $(call cc-option, -mllvm -$(1), $(call cc-option, --param $(1)))
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ifdef CONFIG_KASAN_STACK
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stack_enable := 1
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else
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stack_enable := 0
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endif
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ifdef CONFIG_KASAN_GENERIC
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ifdef CONFIG_KASAN_INLINE
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call_threshold := 10000
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else
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call_threshold := 0
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endif
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CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
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# -fasan-shadow-offset fails without -fsanitize
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CFLAGS_KASAN_SHADOW := $(call cc-option, -fsanitize=kernel-address \
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-fasan-shadow-offset=$(KASAN_SHADOW_OFFSET), \
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$(call cc-option, -fsanitize=kernel-address \
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-mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET)))
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ifeq ($(strip $(CFLAGS_KASAN_SHADOW)),)
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CFLAGS_KASAN := $(CFLAGS_KASAN_MINIMAL)
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else
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# Now add all the compiler specific options that are valid standalone
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CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
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$(call cc-param,asan-globals=1) \
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$(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
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$(call cc-param,asan-instrument-allocas=1)
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endif
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CFLAGS_KASAN += $(call cc-param,asan-stack=$(stack_enable))
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# Instrument memcpy/memset/memmove calls by using instrumented __asan_mem*()
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# instead. With compilers that don't support this option, compiler-inserted
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# memintrinsics won't be checked by KASAN on GENERIC_ENTRY architectures.
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CFLAGS_KASAN += $(call cc-param,asan-kernel-mem-intrinsic-prefix=1)
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endif # CONFIG_KASAN_GENERIC
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ifdef CONFIG_KASAN_SW_TAGS
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ifdef CONFIG_KASAN_INLINE
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instrumentation_flags := $(call cc-param,hwasan-mapping-offset=$(KASAN_SHADOW_OFFSET))
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else
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instrumentation_flags := $(call cc-param,hwasan-instrument-with-calls=1)
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endif
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CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
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$(call cc-param,hwasan-instrument-stack=$(stack_enable)) \
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$(call cc-param,hwasan-use-short-granules=0) \
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$(call cc-param,hwasan-inline-all-checks=0) \
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$(instrumentation_flags)
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# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*().
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CFLAGS_KASAN += $(call cc-param,hwasan-kernel-mem-intrinsic-prefix=1)
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endif # CONFIG_KASAN_SW_TAGS
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export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
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