linux/mm/kasan/Makefile
Masahiro Yamada 893ab00439 kbuild: remove cc-option test of -fno-stack-protector
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>
2020-07-07 11:13:10 +09:00

35 lines
1.4 KiB
Makefile

# SPDX-License-Identifier: GPL-2.0
KASAN_SANITIZE := n
UBSAN_SANITIZE := n
KCOV_INSTRUMENT := n
# Disable ftrace to avoid recursion.
CFLAGS_REMOVE_common.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_generic.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_generic_report.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_init.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_quarantine.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_report.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_tags.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_tags_report.o = $(CC_FLAGS_FTRACE)
# Function splitter causes unnecessary splits in __asan_load1/__asan_store1
# see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63533
CC_FLAGS_KASAN_RUNTIME := $(call cc-option, -fno-conserve-stack)
CC_FLAGS_KASAN_RUNTIME += -fno-stack-protector
# Disable branch tracing to avoid recursion.
CC_FLAGS_KASAN_RUNTIME += -DDISABLE_BRANCH_PROFILING
CFLAGS_common.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_generic.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_generic_report.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_init.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_quarantine.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_report.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_tags.o := $(CC_FLAGS_KASAN_RUNTIME)
CFLAGS_tags_report.o := $(CC_FLAGS_KASAN_RUNTIME)
obj-$(CONFIG_KASAN) := common.o init.o report.o
obj-$(CONFIG_KASAN_GENERIC) += generic.o generic_report.o quarantine.o
obj-$(CONFIG_KASAN_SW_TAGS) += tags.o tags_report.o