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arm64/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.

With all sections now handled, enable orphan section warnings.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20200902025347.2504702-2-keescook@chromium.org
This commit is contained in:
Kees Cook 2020-09-01 19:53:43 -07:00 committed by Ingo Molnar
parent 414d2ff5e5
commit b3e5d80d0c
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/Makefile
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@ -29,6 +29,10 @@ LDFLAGS_vmlinux += --fix-cortex-a53-843419
endif
endif
# We never want expected sections to be placed heuristically by the
# linker. All sections should be explicitly named in the linker script.
LDFLAGS_vmlinux += $(call ld-option, --orphan-handling=warn)
ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS), y)
ifneq ($(CONFIG_ARM64_LSE_ATOMICS), y)
$(warning LSE atomics not supported by binutils)