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| author | Kees Cook <keescook@chromium.org> | 2020-09-01 19:53:44 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-09-03 10:28:35 +0200 |
| commit | 5a17850e251a55bba6d65aefbfeacfa9888cd2cd (patch) | |
| tree | 2e24a054941809eac81d1506590f5a5e4f27b5d4 /arch | |
| parent | b3e5d80d0c48c0cc7bce56473672f4e6e1210910 (diff) | |
| download | linux-5a17850e251a55bba6d65aefbfeacfa9888cd2cd.tar.bz2 | |
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 4e877354515f..e589da3c8949 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -16,6 +16,10 @@ LDFLAGS_vmlinux += --be8 KBUILD_LDFLAGS_MODULE += --be8 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_ARM_MODULE_PLTS),y) KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds endif |