linux-kernel - Re: [PATCH 0/3] Dynptr Verifier Adjustments

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Message-ID: <CAEf4BzatBnBH8RHczLerMsW4NvTtx6xj5COjGzVvTkRxfciw4Q@mail.gmail.com>
Date:   Thu, 27 Apr 2023 16:42:40 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Daniel Rosenberg <drosen@...gle.com>,
        "Jose E . Marchesi" <jose.marchesi@...cle.com>
Cc:     bpf@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Joanne Koong <joannelkoong@...il.com>,
        Mykola Lysenko <mykolal@...com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH 0/3] Dynptr Verifier Adjustments

On Thu, Apr 27, 2023 at 4:36 PM Daniel Rosenberg <drosen@...gle.com> wrote:
>
> On Wed, Apr 26, 2023 at 4:39 PM Andrii Nakryiko
> <andrii.nakryiko@...il.com> wrote:
> >
> > Don't know, show the sequence of commands you are running?
> >
> > I have linux source in ~/linux, and KBUILD_OUTPUT set to
> > ~/linux-build/default. And it only takes this:
> >
> > $ cd ~/linux
> > $ make -j90 # build kernel
> > $ cd tools/testing/selftests/bpf
> > $ make -j90 # build selftests
> >
> > And that's it.
>
> I've tried the same, modulo some paths. I'm pretty sure it's version
> related at this point.
> The current issue I'm seeing is "error: indirect call in function,
> which are not supported by eBPF" when using GCC-BPF for
> progs/bind4_prog.c

I don't think GCC-BPF is able to compile selftests properly just yet.
So I guess the problem is that you do have some version of gcc-bpf in
the system and selftest's Makefile tries to build gcc variants of
test_progs? That's bad (I don't have GCC-BPF locally, and everyone
else apparently as well).

So for now just `make BPF_GCC=` ? CC'ing Jose, we should probably
agree on some criteria of "GCC-BPF is really capable of building
selftests" and adjust Makefile to only attempt GCC BPF build in that
case.


>
> Currently using clang 16.0.0 and gcc 12.2.0-14.
> I did manage to get it to build by just commenting out TEST_GEN_PROGS
> += test_progs-bpf_gcc