netdev - Re: [PATCH bpf-next v1 5/6] bpf: selftests: Fix fd cleanup in sk

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Date:   Thu, 7 Oct 2021 14:48:00 -0700
From:   Song Liu <song@...nel.org>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     Kumar Kartikeya Dwivedi <memxor@...il.com>,
        bpf <bpf@...r.kernel.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>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v1 5/6] bpf: selftests: Fix fd cleanup in
 sk_lookup test

On Tue, Oct 5, 2021 at 11:50 PM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> On Wed, Oct 06, 2021 at 02:28 AM CEST, Kumar Kartikeya Dwivedi wrote:
> > Similar to the fix in commit:
> > e31eec77e4ab (bpf: selftests: Fix fd cleanup in get_branch_snapshot)
> >
> > We use memset to set fds to -1 without breaking on future changes to
> > the array size (when MAX_SERVER constant is bumped).
> >
> > The particular close(0) occurs on non-reuseport tests, so it can be seen
> > with -n 115/{2,3} but not 115/4. This can cause problems with future
> > tests if they depend on BTF fd never being acquired as fd 0, breaking
> > internal libbpf assumptions.
> >
> > Cc: Jakub Sitnicki <jakub@...udflare.com>
> > Fixes: 0ab5539f8584 (selftests/bpf: Tests for BPF_SK_LOOKUP attach point)

Similar to Andrii's comment in 6/6, we need add " to the Fixes tag.

> > Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>

Acked-by: Song Liu <songliubraving@...com>

>
> Reviewed-by: Jakub Sitnicki <jakub@...udflare.com>