linux-kernel - Re: [PATCH v4] selftests: Fix seccomp to support relocatable build (O=objdir)

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Date:   Wed, 25 Mar 2020 16:26:25 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     luto@...capital.net, wad@...omium.org, shuah@...nel.org,
        mpe@...erman.id.au, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] selftests: Fix seccomp to support relocatable build
 (O=objdir)

On Wed, Mar 25, 2020 at 05:16:02PM -0600, Shuah Khan wrote:
> Fix seccomp relocatable builds. This is a simple fix to use the
> right lib.mk variable TEST_GEN_PROGS. Local header dependency
> is addressed in a change to lib.mk as a framework change that
> enforces the dependency without requiring changes to individual
> tests.
> 
> The following use-cases work with this change:
> 
> In seccomp directory:
> make all and make clean
> 
> From top level from main Makefile:
> make kselftest-install O=objdir ARCH=arm64 HOSTCC=gcc \
>  CROSS_COMPILE=aarch64-linux-gnu- TARGETS=seccomp
> 
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>

Thanks for getting this fixed. :)

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
> Changes since v3:
> Simplified logic based on comments from Kees and Michael
> 
>  tools/testing/selftests/seccomp/Makefile | 17 +++--------------
>  1 file changed, 3 insertions(+), 14 deletions(-)
> 
> diff --git a/tools/testing/selftests/seccomp/Makefile b/tools/testing/selftests/seccomp/Makefile
> index 1760b3e39730..0ebfe8b0e147 100644
> --- a/tools/testing/selftests/seccomp/Makefile
> +++ b/tools/testing/selftests/seccomp/Makefile
> @@ -1,17 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
> -all:
> -
> -include ../lib.mk
> -
> -.PHONY: all clean
> -
> -BINARIES := seccomp_bpf seccomp_benchmark
>  CFLAGS += -Wl,-no-as-needed -Wall
> +LDFLAGS += -lpthread
>  
> -seccomp_bpf: seccomp_bpf.c ../kselftest_harness.h
> -	$(CC) $(CFLAGS) $(LDFLAGS) $< -lpthread -o $@
> -
> -TEST_PROGS += $(BINARIES)
> -EXTRA_CLEAN := $(BINARIES)
> -
> -all: $(BINARIES)
> +TEST_GEN_PROGS := seccomp_bpf seccomp_benchmark
> +include ../lib.mk
> -- 
> 2.20.1
> 

-- 
Kees Cook