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arm64: vdso: Force the vDSO to be linked as BTI when built for BTI 

When the kernel and hence vDSO are built with BTI enabled force the linker
to link the vDSO as BTI. This will cause the linker to warn if any of the
input files do not have the BTI annotation, ensuring that we don't silently
fail to provide a vDSO that is built and annotated for BTI when the
kernel is being built with BTI.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200506195138.22086-11-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2020-05-06 20:51:37 +01:00 committed by Will Deacon
parent a6aadc2827
commit 5e02a1887f
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/kernel/vdso/Makefile
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@ -17,8 +17,10 @@ obj-vdso := vgettimeofday.o note.o sigreturn.o
targets := $(obj-vdso) vdso.so vdso.so.dbg
obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti
ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
--build-id -n -T
--build-id -n $(btildflags-y) -T
ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
ccflags-y += -DDISABLE_BRANCH_PROFILING