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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <84b3cb2c-2dff-4cd8-724c-a1b56316816b@redhat.com>
Date:   Mon, 7 Jun 2021 19:41:52 -0700
From:   Tom Stellard <tstellar@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.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 6/7/21 5:25 PM, Andrii Nakryiko wrote:
> 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?
>
  
clang version 12.0.0 (Fedora 12.0.0-2.fc35)
  
>> 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.
>>
  
Here is bind_perm.o: https://fedorapeople.org/~tstellar/bind_perm.o

Thanks,
Tom
  
>>
>>>
>>> Thanks,
>>> Tom
>>>
>>
>