netdev - Re: [PATCH v9 bpf-next 10/14] bpf: Add d

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Message-ID: <CACYkzJ57H391Xe20iGyHPkLWDumAcMuRu_oqV0ZzBPUOZBqNvA@mail.gmail.com>
Date:   Fri, 7 Aug 2020 02:31:52 +0200
From:   KP Singh <kpsingh@...omium.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v9 bpf-next 10/14] bpf: Add d_path helper

On Sat, Aug 1, 2020 at 7:04 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding d_path helper function that returns full path for

[...]

> +}
> +
> +BTF_SET_START(btf_allowlist_d_path)
> +BTF_ID(func, vfs_truncate)
> +BTF_ID(func, vfs_fallocate)
> +BTF_ID(func, dentry_open)
> +BTF_ID(func, vfs_getattr)
> +BTF_ID(func, filp_close)
> +BTF_SET_END(btf_allowlist_d_path)
> +

> +static bool bpf_d_path_allowed(const struct bpf_prog *prog)
> +{
> +       return btf_id_set_contains(&btf_allowlist_d_path, prog->aux->attach_btf_id);
> +}

Can we allow it for LSM programs too?

- KP

> +
> +BTF_ID_LIST(bpf_d_path_btf_ids)
> +BTF_ID(struct, path)
> +

[...]

>
>  /* integer value in 'imm' field of BPF_CALL instruction selects which helper
> --
> 2.25.4
>