linux-kernel - Re: [PATCH v3] selftests: Fix seccomp to support relocatable build (O=objdir)

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Message-ID: <202003231346.2D1FF7E0C3@keescook>
Date:   Mon, 23 Mar 2020 13:50:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>, shuah@...nel.org,
        luto@...capital.net, wad@...omium.org, daniel@...earbox.net,
        kafai@...com, yhs@...com, andriin@...com,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        khilman@...libre.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v3] selftests: Fix seccomp to support relocatable build
 (O=objdir)

On Mon, Mar 23, 2020 at 02:18:29PM -0600, Shuah Khan wrote:
> The following two changes work. You both have better make foo than
> I do. Can you see any issues with this proposal? I can send patch
> to do this, so we can do a larger test.
> 
> --------------------------------------------------------------
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index 3ed0134a764d..54caa9a4ec8a 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -137,7 +137,7 @@ endif
>  # Selftest makefiles can override those targets by setting
>  # OVERRIDE_TARGETS = 1.
>  ifeq ($(OVERRIDE_TARGETS),)
> -$(OUTPUT)/%:%.c
> +$(OUTPUT)/%:%.c ../kselftest_harness.h ../kselftest.h
>         $(LINK.c) $^ $(LDLIBS) -o $@

I don't think this will work because some tests are in subdirectories.
The Makefile needs to know what the top-level directory of the selftest
tree is (which I think is $(selfdir) ?) I think this might be more
complete:

$(OUTPUT)/%: %.c $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
	$(LINK.c) $^ $(LDLIBS) -o $@

> diff --git a/tools/testing/selftests/seccomp/Makefile
> b/tools/testing/selftests/seccomp/Makefile
> index a0388fd2c3f2..0ebfe8b0e147 100644
> --- a/tools/testing/selftests/seccomp/Makefile
> +++ b/tools/testing/selftests/seccomp/Makefile
> @@ -2,14 +2,5 @@
>  CFLAGS += -Wl,-no-as-needed -Wall
>  LDFLAGS += -lpthread
> 
> -.PHONY: all clean
> -
> +TEST_GEN_PROGS := seccomp_bpf seccomp_benchmark
>  include ../lib.mk
> -
> -# OUTPUT set by lib.mk
> -TEST_GEN_PROGS := $(OUTPUT)/seccomp_bpf $(OUTPUT)/seccomp_benchmark
> -
> -$(TEST_GEN_PROGS): ../kselftest_harness.h
> -
> -all: $(TEST_GEN_PROGS)
> -

This part looks right. :)

-- 
Kees Cook