netdev - Re: [PATCH v2 bpf-next 06/11] libbpf: add BPF static linker APIs

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Message-ID: <CAEf4Bzad7OQj9JS7GVmBjAXyxKcc-nd77gxPQfFB8_hy_Xo+_g@mail.gmail.com>
Date:   Mon, 7 Jun 2021 17:25:11 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Tom Stellard <tstellar@...hat.com>
Cc:     Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...com>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 bpf-next 06/11] libbpf: add BPF static linker APIs

On Mon, Jun 7, 2021 at 4:12 PM Tom Stellard <tstellar@...hat.com> wrote:
>
>
> Hi,
>
> >+                               } else {
> >+                                       pr_warn("relocation against STT_SECTION in non-exec section is not supported!\n");
> >+                                       return -EINVAL;
> >+                               }
>
> Kernel build of commit 324c92e5e0ee are failing for me with this error
> message:
>
> /builddir/build/BUILD/kernel-5.13-rc4-61-g324c92e5e0ee/linux-5.13.0-0.rc4.20210603git324c92e5e0ee.35.fc35.x86_64/tools/bpf/bpftool/bpftool gen object /builddir/build/BUILD/kernel-5.13-rc4-61-g324c92e5e0ee/linux-5.13.0-0.rc4.20210603git324c92e5e0ee.35.fc35.x86_64/tools/testing/selftests/bpf/bind_perm.linked1.o /builddir/build/BUILD/kernel-5.13-rc4-61-g324c92e5e0ee/linux-5.13.0-0.rc4.20210603git324c92e5e0ee.35.fc35.x86_64/tools/testing/selftests/bpf/bind_perm.o
> libbpf: relocation against STT_SECTION in non-exec section is not supported!
>
> What information can I provide to help debug this failure?

Can you please send that bind_perm.o file? Also what's your `clang
--version` output?

I suspect this might be due to Clang commit 6a2ea84600ba ("BPF: Add
more relocation kinds"), but I get a different error on 324c92e5e0ee.
So meanwhile you might try applying 9f0c317f6aa1 ("libbpf: Add support
for new llvm bpf relocations") from bpf-next/master and check if that
helps. But please do share bind_perm.o, just to double-check what's
going on.


>
> Thanks,
> Tom
>