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893ab00439
Some Makefiles already pass -fno-stack-protector unconditionally. For example, arch/arm64/kernel/vdso/Makefile, arch/x86/xen/Makefile. No problem report so far about hard-coding this option. So, we can assume all supported compilers know -fno-stack-protector. GCC 4.8 and Clang support this option (https://godbolt.org/z/_HDGzN) Get rid of cc-option from -fno-stack-protector. Remove CONFIG_CC_HAS_STACKPROTECTOR_NONE, which is always 'y'. Note: arch/mips/vdso/Makefile adds -fno-stack-protector twice, first unconditionally, and second conditionally. I removed the second one. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
35 lines
1.4 KiB
Makefile
35 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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KASAN_SANITIZE := n
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UBSAN_SANITIZE := n
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KCOV_INSTRUMENT := n
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# Disable ftrace to avoid recursion.
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CFLAGS_REMOVE_common.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_generic.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_generic_report.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_init.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_quarantine.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_report.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_tags.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_tags_report.o = $(CC_FLAGS_FTRACE)
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# Function splitter causes unnecessary splits in __asan_load1/__asan_store1
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# see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63533
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CC_FLAGS_KASAN_RUNTIME := $(call cc-option, -fno-conserve-stack)
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CC_FLAGS_KASAN_RUNTIME += -fno-stack-protector
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# Disable branch tracing to avoid recursion.
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CC_FLAGS_KASAN_RUNTIME += -DDISABLE_BRANCH_PROFILING
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CFLAGS_common.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_generic.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_generic_report.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_init.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_quarantine.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_report.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_tags.o := $(CC_FLAGS_KASAN_RUNTIME)
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CFLAGS_tags_report.o := $(CC_FLAGS_KASAN_RUNTIME)
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obj-$(CONFIG_KASAN) := common.o init.o report.o
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obj-$(CONFIG_KASAN_GENERIC) += generic.o generic_report.o quarantine.o
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obj-$(CONFIG_KASAN_SW_TAGS) += tags.o tags_report.o
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