arm/build: Warn on orphan section placement
We don't want to depend on the linker's orphan section placement heuristics as these can vary between linkers, and may change between versions. All sections need to be explicitly handled in the linker script. Specifically, this would have made a recently fixed bug very obvious: ld: warning: orphan section `.fixup' from `arch/arm/lib/copy_from_user.o' being placed in section `.fixup' With all sections handled, enable orphan section warning. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20200902025347.2504702-3-keescook@chromium.org
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@ -16,6 +16,10 @@ LDFLAGS_vmlinux += --be8
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KBUILD_LDFLAGS_MODULE += --be8
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endif
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# We never want expected sections to be placed heuristically by the
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# linker. All sections should be explicitly named in the linker script.
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LDFLAGS_vmlinux += $(call ld-option, --orphan-handling=warn)
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ifeq ($(CONFIG_ARM_MODULE_PLTS),y)
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KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds
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endif
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