314bcbf09f
Add some tests that verify that BTI functions correctly for static binaries built with and without BTI support, verifying that SIGILL is generated when expected and is not generated in other situations. Since BTI support is still being rolled out in distributions these tests are built entirely free standing, no libc support is used at all so none of the standard helper functions for kselftest can be used and we open code everything. This also means we aren't testing the kernel support for the dynamic linker, though the test program can be readily adapted for that once it becomes something that we can reliably build and run. These tests were originally written by Dave Martin, I've adapted them for kselftest, mainly around the build system and the output format. Signed-off-by: Mark Brown <broonie@kernel.org> Cc: Dave Martin <Dave.Martin@arm.com> Link: https://lore.kernel.org/r/20210309193731.57247-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
62 lines
1.8 KiB
Makefile
62 lines
1.8 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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TEST_GEN_PROGS := btitest nobtitest
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PROGS := $(patsubst %,gen/%,$(TEST_GEN_PROGS))
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# These tests are built as freestanding binaries since otherwise BTI
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# support in ld.so is required which is not currently widespread; when
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# it is available it will still be useful to test this separately as the
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# cases for statically linked and dynamically lined binaries are
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# slightly different.
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CFLAGS_NOBTI = -DBTI=0
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CFLAGS_BTI = -mbranch-protection=standard -DBTI=1
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CFLAGS_COMMON = -ffreestanding -Wall -Wextra $(CFLAGS)
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BTI_CC_COMMAND = $(CC) $(CFLAGS_BTI) $(CFLAGS_COMMON) -c -o $@ $<
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NOBTI_CC_COMMAND = $(CC) $(CFLAGS_NOBTI) $(CFLAGS_COMMON) -c -o $@ $<
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%-bti.o: %.c
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$(BTI_CC_COMMAND)
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%-bti.o: %.S
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$(BTI_CC_COMMAND)
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%-nobti.o: %.c
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$(NOBTI_CC_COMMAND)
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%-nobti.o: %.S
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$(NOBTI_CC_COMMAND)
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BTI_OBJS = \
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test-bti.o \
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signal-bti.o \
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start-bti.o \
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syscall-bti.o \
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system-bti.o \
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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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NOBTI_OBJS = \
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test-nobti.o \
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signal-nobti.o \
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start-nobti.o \
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syscall-nobti.o \
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system-nobti.o \
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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 $@ $^
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# Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list
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# to account for any OUTPUT target-dirs optionally provided by
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# the toplevel makefile
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include ../../lib.mk
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$(TEST_GEN_PROGS): $(PROGS)
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cp $(PROGS) $(OUTPUT)/
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