linux-kernel - Re: [RFC PATCH bpf-next 00/13] bpf: Introduce BPF namespace

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Date:   Mon, 27 Mar 2023 12:03:56 -0700
From:   Song Liu <song@...nel.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH bpf-next 00/13] bpf: Introduce BPF namespace

On Sun, Mar 26, 2023 at 2:22 AM Yafang Shao <laoar.shao@...il.com> wrote:
>
> Currently only CAP_SYS_ADMIN can iterate BPF object IDs and convert IDs
> to FDs, that's intended for BPF's security model[1]. Not only does it
> prevent non-privilidged users from getting other users' bpf program, but
> also it prevents the user from iterating his own bpf objects.
>
> In container environment, some users want to run bpf programs in their
> containers. These users can run their bpf programs under CAP_BPF and
> some other specific CAPs, but they can't inspect their bpf programs in a
> generic way. For example, the bpftool can't be used as it requires
> CAP_SYS_ADMIN. That is very inconvenient.

Agreed that it is important to enable tools like bpftool without
CAP_SYS_ADMIN. However, I am not sure whether we need a new
namespace for this. Can we reuse some existing namespace for this?

If we do need a new namespace, maybe we should share some effort
with tracer namespace proposal [1]?

Thanks,
Song

[1] https://lpc.events/event/16/contributions/1237/