netdev - Re: [PATCH net 1/2] selftests/bpf: Fix build error with ima

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Date:   Wed, 18 May 2022 15:36:53 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     Networking <netdev@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH net 1/2] selftests/bpf: Fix build error with ima_setup.sh

On Sun, May 15, 2022 at 8:53 PM Hangbin Liu <liuhangbin@...il.com> wrote:
>
> On Fri, May 13, 2022 at 02:58:05PM -0700, Andrii Nakryiko wrote:
> > > -TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
> > > -                      ima_setup.sh                                     \
> > > +TRUNNER_EXTRA_BUILD := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
> > >                        $(wildcard progs/btf_dump_test_case_*.c)
> >
> >
> > note that progs/btf_dump_test_case_*.c are not built, they are just
> > copied over (C source files), so I don't think this fix is necessary.
> >
> > btw, I tried running `OUTPUT="/tmp/bpf" make test_progs` and it didn't
> > error out. But tbh, I'd recommend building everything instead of
> > building individual targets.
>
> After update the code to latest bpf-next. It works this time, the ima_setup.sh
> was copied to target folder correctly.
>
>   EXT-COPY [test_progs] urandom_read bpf_testmod.ko liburandom_read.so ima_setup.sh btf_dump_test_case_bitfields.c btf_dump_test_case_multidim.c btf_dump_test_case_namespacing.c btf_dump_test_case_ordering.c btf_dump_test_case_packing.c btf_dump_test_case_padding.c btf_dump_test_case_syntax.c
>   BINARY   test_progs
>
> Not sure why the previous kernel doesn't work. But anyway I will drop this patch.
>
> On the other hand, when I build with latest bpf-next. I got error like:
>
> """
> # OUTPUT="/tmp/bpf" make test_progs
>   BINARY   urandom_read                                                                                                                                                       gcc -g -O0 -rdynamic -Wall -Werror -DHAVE_GENHDR  -I/home/net/tools/testing/selftests/bpf -I/tmp/bpf/tools/include -I/home/net/include/generated -I/home/net/tools/lib -I/home/net/tools/include -I/home/net/tools/include/uapi -I/tmp/bpf  urandom_read.c urandom_read_aux.c  \
>           liburandom_read.so -lelf -lz -lrt -lpthread   \
>           -Wl,-rpath=. -Wl,--build-id=sha1 -o /tmp/bpf/urandom_read

we assume liburandom_read.so is going to be under selftests/bpf here,
but it's actually under $(OUTPUT)/

Can you try $(OUTPUT)/liburandom_read.so? I suspect this might break
-rpath=., though, but let's try this first?


> /usr/bin/ld: cannot find liburandom_read.so: No such file or directory                                                                                                        collect2: error: ld returned 1 exit status
> make: *** [Makefile:177: /tmp/bpf/urandom_read] Error 1
>
> # ls /tmp/bpf/liburandom_read.so
> /tmp/bpf/liburandom_read.so
> """
>
> after I copy to liburandom_read.so back to tools/testing/selftests/bpf the build
> success.
>
> """
> # cp /tmp/bpf/liburandom_read.so /home/net/tools/testing/selftests/bpf/
> # gcc -g -O0 -rdynamic -Wall -Werror -DHAVE_GENHDR -I/home/net/tools/testing/selftests/bpf -I/tmp/bpf/tools/include -I/home/net/include/generated -I/home/net/tools/lib -I/home/net/tools/include -I/home/net/tools/include/uapi -I/tmp/bpf  urandom_read.c urandom_read_aux.c liburandom_read.so -lelf -lz -lrt -lpthread -Wl,-rpath=. -Wl,--build-id=sha1 -o /tmp/bpf/urandom_read
> # echo $?
> 0
> """
>
> Do you know why this happens?
>
> Thanks
> Hangbin