linux-kernel - Re: [PATCH bpf-next 5/7] tools/libbpf: Add support for BPF_MODIFY

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Date:   Tue, 3 Mar 2020 14:45:12 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     KP Singh <kpsingh@...omium.org>
Cc:     open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Paul Turner <pjt@...gle.com>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>
Subject: Re: [PATCH bpf-next 5/7] tools/libbpf: Add support for BPF_MODIFY_RETURN

On Tue, Mar 3, 2020 at 6:12 AM KP Singh <kpsingh@...omium.org> wrote:
>
> From: KP Singh <kpsingh@...gle.com>
>
> Signed-off-by: KP Singh <kpsingh@...gle.com>
> ---

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/lib/bpf/libbpf.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index f8c4042e5855..223be01dc466 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -6288,6 +6288,10 @@ static const struct bpf_sec_def section_defs[] = {
>                 .expected_attach_type = BPF_TRACE_FENTRY,
>                 .is_attach_btf = true,
>                 .attach_fn = attach_trace),
> +       SEC_DEF("fmod_ret/", TRACING,
> +               .expected_attach_type = BPF_MODIFY_RETURN,
> +               .is_attach_btf = true,
> +               .attach_fn = attach_trace),
>         SEC_DEF("fexit/", TRACING,
>                 .expected_attach_type = BPF_TRACE_FEXIT,
>                 .is_attach_btf = true,
> --
> 2.20.1
>