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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>
This commit is contained in:
parent
dd7699e37f
commit
893ab00439
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@ -540,8 +540,8 @@ followed by a test macro::
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If you need to expose a compiler capability to makefiles and/or C source files,
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If you need to expose a compiler capability to makefiles and/or C source files,
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`CC_HAS_` is the recommended prefix for the config option::
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`CC_HAS_` is the recommended prefix for the config option::
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config CC_HAS_STACKPROTECTOR_NONE
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config CC_HAS_ASM_GOTO
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def_bool $(cc-option,-fno-stack-protector)
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def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
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Build as module only
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Build as module only
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~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~~~~~~
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2
Makefile
2
Makefile
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@ -762,7 +762,7 @@ ifneq ($(CONFIG_FRAME_WARN),0)
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KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
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KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
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endif
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endif
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stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
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stackp-flags-y := -fno-stack-protector
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stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
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stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
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stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
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stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
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@ -478,9 +478,6 @@ config HAVE_STACKPROTECTOR
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An arch should select this symbol if:
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An arch should select this symbol if:
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- it has implemented a stack canary (e.g. __stack_chk_guard)
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- it has implemented a stack canary (e.g. __stack_chk_guard)
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config CC_HAS_STACKPROTECTOR_NONE
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def_bool $(cc-option,-fno-stack-protector)
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config STACKPROTECTOR
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config STACKPROTECTOR
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bool "Stack Protector buffer overflow detection"
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bool "Stack Protector buffer overflow detection"
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depends on HAVE_STACKPROTECTOR
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depends on HAVE_STACKPROTECTOR
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@ -84,9 +84,8 @@ endif
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# -fstack-protector-strong triggers protection checks in this code,
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# -fstack-protector-strong triggers protection checks in this code,
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# but it is being used too early to link to meaningful stack_chk logic.
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# but it is being used too early to link to meaningful stack_chk logic.
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nossp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
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$(foreach o, $(libfdt_objs) atags_to_fdt.o, \
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$(foreach o, $(libfdt_objs) atags_to_fdt.o, \
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$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt $(nossp-flags-y)))
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$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
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# These were previously generated C files. When you are building the kernel
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# These were previously generated C files. When you are building the kernel
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# with O=, make sure to remove the stale files in the output tree. Otherwise,
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# with O=, make sure to remove the stale files in the output tree. Otherwise,
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@ -35,8 +35,7 @@ cflags-vdso := $(ccflags-vdso) \
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-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
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-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
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-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
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-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
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-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
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-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
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$(call cc-option, -fno-asynchronous-unwind-tables) \
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$(call cc-option, -fno-asynchronous-unwind-tables)
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$(call cc-option, -fno-stack-protector)
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aflags-vdso := $(ccflags-vdso) \
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aflags-vdso := $(ccflags-vdso) \
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-D__ASSEMBLY__ -Wa,-gdwarf-2
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-D__ASSEMBLY__ -Wa,-gdwarf-2
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@ -16,7 +16,7 @@ CFLAGS_prom_init.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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CFLAGS_btext.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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CFLAGS_btext.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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CFLAGS_prom.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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CFLAGS_prom.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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CFLAGS_prom_init.o += $(call cc-option, -fno-stack-protector)
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CFLAGS_prom_init.o += -fno-stack-protector
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CFLAGS_prom_init.o += -DDISABLE_BRANCH_PROFILING
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CFLAGS_prom_init.o += -DDISABLE_BRANCH_PROFILING
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CFLAGS_prom_init.o += -ffreestanding
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CFLAGS_prom_init.o += -ffreestanding
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@ -1,6 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0
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# SPDX-License-Identifier: GPL-2.0
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CFLAGS_bootx_init.o += -fPIC
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CFLAGS_bootx_init.o += -fPIC
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CFLAGS_bootx_init.o += $(call cc-option, -fno-stack-protector)
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CFLAGS_bootx_init.o += -fno-stack-protector
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KASAN_SANITIZE_bootx_init.o := n
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KASAN_SANITIZE_bootx_init.o := n
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@ -54,7 +54,7 @@ $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
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# optimize sibling calls.
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# optimize sibling calls.
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#
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#
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CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
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$(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
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-fno-omit-frame-pointer -foptimize-sibling-calls \
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-fno-omit-frame-pointer -foptimize-sibling-calls \
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-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
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-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
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@ -93,7 +93,7 @@ KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
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KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
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KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
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KBUILD_CFLAGS_32 += -fno-stack-protector
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KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
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KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
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KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
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KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
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KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
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KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
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@ -121,8 +121,7 @@ LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
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CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
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CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
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$(call cc-option, -fno-stack-protector,) \
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-fno-stack-protector $(call cc-option, -fno-stack-protector-all)
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$(call cc-option, -fno-stack-protector-all,)
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# Options used by linker script
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# Options used by linker script
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export LDS_START := $(START)
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export LDS_START := $(START)
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@ -37,7 +37,7 @@ REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \
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-mno-mmx -mno-sse
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-mno-mmx -mno-sse
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding)
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding)
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -fno-stack-protector)
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REALMODE_CFLAGS += -fno-stack-protector
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
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REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
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export REALMODE_CFLAGS
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export REALMODE_CFLAGS
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@ -36,7 +36,7 @@ cflags-$(CONFIG_X86_64) := -mcmodel=small
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_CFLAGS += -mno-mmx -mno-sse
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KBUILD_CFLAGS += -mno-mmx -mno-sse
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KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
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KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
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KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
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KBUILD_CFLAGS += -fno-stack-protector
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KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
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KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
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KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
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KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
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KBUILD_CFLAGS += -Wno-pointer-sign
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KBUILD_CFLAGS += -Wno-pointer-sign
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@ -82,7 +82,7 @@ $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
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# optimize sibling calls.
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# optimize sibling calls.
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#
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#
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CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
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$(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
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-fno-omit-frame-pointer -foptimize-sibling-calls \
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-fno-omit-frame-pointer -foptimize-sibling-calls \
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-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
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-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
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@ -151,7 +151,7 @@ KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 := $(filter-out $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
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KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
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KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
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KBUILD_CFLAGS_32 += -fno-stack-protector
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KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
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KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
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KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
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KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
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KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
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KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
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@ -17,8 +17,7 @@ KCOV_INSTRUMENT_perf_event.o := n
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KCSAN_SANITIZE_common.o := n
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KCSAN_SANITIZE_common.o := n
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# Make sure load_percpu_segment has no stackprotector
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# Make sure load_percpu_segment has no stackprotector
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nostackp := $(call cc-option, -fno-stack-protector)
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CFLAGS_common.o := -fno-stack-protector
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CFLAGS_common.o := $(nostackp)
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obj-y := cacheinfo.o scattered.o topology.o
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obj-y := cacheinfo.o scattered.o topology.o
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obj-y += common.o
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obj-y += common.o
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@ -24,7 +24,7 @@ ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_cmdline.o = -pg
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CFLAGS_REMOVE_cmdline.o = -pg
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endif
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endif
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CFLAGS_cmdline.o := $(call cc-option, -fno-stack-protector)
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CFLAGS_cmdline.o := -fno-stack-protector
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endif
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endif
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inat_tables_script = $(srctree)/arch/x86/tools/gen-insn-attr-x86.awk
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inat_tables_script = $(srctree)/arch/x86/tools/gen-insn-attr-x86.awk
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@ -22,10 +22,9 @@ obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o mmap.o \
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obj-y += pat/
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obj-y += pat/
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# Make sure __phys_addr has no stackprotector
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# Make sure __phys_addr has no stackprotector
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nostackp := $(call cc-option, -fno-stack-protector)
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CFLAGS_physaddr.o := -fno-stack-protector
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CFLAGS_physaddr.o := $(nostackp)
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CFLAGS_setup_nx.o := -fno-stack-protector
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CFLAGS_setup_nx.o := $(nostackp)
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CFLAGS_mem_encrypt_identity.o := -fno-stack-protector
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CFLAGS_mem_encrypt_identity.o := $(nostackp)
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CFLAGS_fault.o := -I $(srctree)/$(src)/../include/asm/trace
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CFLAGS_fault.o := -I $(srctree)/$(src)/../include/asm/trace
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@ -3,8 +3,7 @@ OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y
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# __restore_processor_state() restores %gs after S3 resume and so should not
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# __restore_processor_state() restores %gs after S3 resume and so should not
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# itself be stack-protected
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# itself be stack-protected
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nostackp := $(call cc-option, -fno-stack-protector)
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CFLAGS_cpu.o := -fno-stack-protector
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CFLAGS_cpu.o := $(nostackp)
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obj-$(CONFIG_PM_SLEEP) += cpu.o
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obj-$(CONFIG_PM_SLEEP) += cpu.o
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obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o
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obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o
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@ -34,7 +34,7 @@ KCOV_INSTRUMENT := n
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PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
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PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
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PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss
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PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss
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PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
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PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
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PURGATORY_CFLAGS += $(call cc-option,-fno-stack-protector)
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PURGATORY_CFLAGS += -fno-stack-protector
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# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
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# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
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# in turn leaves some undefined symbols like __fentry__ in purgatory and not
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# in turn leaves some undefined symbols like __fentry__ in purgatory and not
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@ -42,7 +42,7 @@ $(obj)/%.so: $(obj)/%.so.dbg FORCE
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# optimize sibling calls.
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# optimize sibling calls.
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#
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#
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CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
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$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
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$(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
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-fno-omit-frame-pointer -foptimize-sibling-calls
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-fno-omit-frame-pointer -foptimize-sibling-calls
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$(vobjs): KBUILD_CFLAGS += $(CFL)
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$(vobjs): KBUILD_CFLAGS += $(CFL)
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@ -9,9 +9,8 @@ CFLAGS_REMOVE_irq.o = -pg
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endif
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endif
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# Make sure early boot has no stackprotector
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# Make sure early boot has no stackprotector
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nostackp := $(call cc-option, -fno-stack-protector)
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CFLAGS_enlighten_pv.o := -fno-stack-protector
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CFLAGS_enlighten_pv.o := $(nostackp)
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CFLAGS_mmu_pv.o := -fno-stack-protector
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CFLAGS_mmu_pv.o := $(nostackp)
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obj-y += enlighten.o
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obj-y += enlighten.o
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obj-y += mmu.o
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obj-y += mmu.o
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@ -30,7 +30,7 @@ KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \
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-include $(srctree)/drivers/firmware/efi/libstub/hidden.h \
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-include $(srctree)/drivers/firmware/efi/libstub/hidden.h \
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-D__NO_FORTIFY \
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-D__NO_FORTIFY \
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||||||
$(call cc-option,-ffreestanding) \
|
$(call cc-option,-ffreestanding) \
|
||||||
$(call cc-option,-fno-stack-protector) \
|
-fno-stack-protector \
|
||||||
$(call cc-option,-fno-addrsig) \
|
$(call cc-option,-fno-addrsig) \
|
||||||
-D__DISABLE_EXPORTS
|
-D__DISABLE_EXPORTS
|
||||||
|
|
||||||
|
|
|
@ -5,8 +5,7 @@ obj-y += mem-reservation.o
|
||||||
obj-y += events/
|
obj-y += events/
|
||||||
obj-y += xenbus/
|
obj-y += xenbus/
|
||||||
|
|
||||||
nostackp := $(call cc-option, -fno-stack-protector)
|
CFLAGS_features.o := -fno-stack-protector
|
||||||
CFLAGS_features.o := $(nostackp)
|
|
||||||
|
|
||||||
dom0-$(CONFIG_ARM64) += arm-device.o
|
dom0-$(CONFIG_ARM64) += arm-device.o
|
||||||
dom0-$(CONFIG_PCI) += pci.o
|
dom0-$(CONFIG_PCI) += pci.o
|
||||||
|
|
|
@ -22,7 +22,7 @@ KCOV_INSTRUMENT_fault-inject.o := n
|
||||||
ifdef CONFIG_AMD_MEM_ENCRYPT
|
ifdef CONFIG_AMD_MEM_ENCRYPT
|
||||||
KASAN_SANITIZE_string.o := n
|
KASAN_SANITIZE_string.o := n
|
||||||
|
|
||||||
CFLAGS_string.o := $(call cc-option, -fno-stack-protector)
|
CFLAGS_string.o := -fno-stack-protector
|
||||||
endif
|
endif
|
||||||
|
|
||||||
# Used by KCSAN while enabled, avoid recursion.
|
# Used by KCSAN while enabled, avoid recursion.
|
||||||
|
@ -300,7 +300,7 @@ endif
|
||||||
UBSAN_SANITIZE_ubsan.o := n
|
UBSAN_SANITIZE_ubsan.o := n
|
||||||
KASAN_SANITIZE_ubsan.o := n
|
KASAN_SANITIZE_ubsan.o := n
|
||||||
KCSAN_SANITIZE_ubsan.o := n
|
KCSAN_SANITIZE_ubsan.o := n
|
||||||
CFLAGS_ubsan.o := $(call cc-option, -fno-stack-protector) $(DISABLE_STACKLEAK_PLUGIN)
|
CFLAGS_ubsan.o := -fno-stack-protector $(DISABLE_STACKLEAK_PLUGIN)
|
||||||
|
|
||||||
obj-$(CONFIG_SBITMAP) += sbitmap.o
|
obj-$(CONFIG_SBITMAP) += sbitmap.o
|
||||||
|
|
||||||
|
|
|
@ -16,7 +16,7 @@ CFLAGS_REMOVE_tags_report.o = $(CC_FLAGS_FTRACE)
|
||||||
# Function splitter causes unnecessary splits in __asan_load1/__asan_store1
|
# Function splitter causes unnecessary splits in __asan_load1/__asan_store1
|
||||||
# see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63533
|
# 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 := $(call cc-option, -fno-conserve-stack)
|
||||||
CC_FLAGS_KASAN_RUNTIME += $(call cc-option, -fno-stack-protector)
|
CC_FLAGS_KASAN_RUNTIME += -fno-stack-protector
|
||||||
# Disable branch tracing to avoid recursion.
|
# Disable branch tracing to avoid recursion.
|
||||||
CC_FLAGS_KASAN_RUNTIME += -DDISABLE_BRANCH_PROFILING
|
CC_FLAGS_KASAN_RUNTIME += -DDISABLE_BRANCH_PROFILING
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue