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kselftest/arm64: bti: force static linking
[ Upstream commitd7a49291d7
] The "bti" selftests are built with -nostdlib, which apparently automatically creates a statically linked binary, which is what we want and need for BTI (to avoid interactions with the dynamic linker). However this is not true when building a PIE binary, which some toolchains (Ubuntu) configure as the default. When compiling btitest with such a toolchain, it will create a dynamically linked binary, which will probably fail some tests, as the dynamic linker might not support BTI: =================== TAP version 13 1..18 not ok 1 nohint_func/call_using_br_x0 not ok 2 nohint_func/call_using_br_x16 not ok 3 nohint_func/call_using_blr .... =================== To make sure we create static binaries, add an explicit -static on the linker command line. This forces static linking even if the toolchain defaults to PIE builds, and fixes btitest runs on BTI enabled machines. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Mark Brown <broonie@kernel.org> Fixes:314bcbf09f
("kselftest: arm64: Add BTI tests") Link: https://lore.kernel.org/r/20220511172129.2078337-1-andre.przywara@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 2 additions and 2 deletions
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@ -39,7 +39,7 @@ BTI_OBJS = \
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teststubs-bti.o \
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trampoline-bti.o
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gen/btitest: $(BTI_OBJS)
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$(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -nostdlib -o $@ $^
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$(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -nostdlib -static -o $@ $^
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NOBTI_OBJS = \
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test-nobti.o \
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@ -50,7 +50,7 @@ NOBTI_OBJS = \
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teststubs-nobti.o \
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trampoline-nobti.o
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gen/nobtitest: $(NOBTI_OBJS)
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$(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -nostdlib -o $@ $^
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$(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -nostdlib -static -o $@ $^
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# Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list
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# to account for any OUTPUT target-dirs optionally provided by
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