netdev - Re: [PATCH v2 bpf-next 1/4] bpf: unprivileged BPF access via /dev/bpf

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Message-ID: <CACAyw9_fVZFW_x4uyTAiRfeH6oq1KHv0uB2wO84u5JZyD+Unaw@mail.gmail.com>
Date:   Wed, 7 Aug 2019 10:03:57 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Song Liu <songliubraving@...com>,
        Kees Cook <keescook@...omium.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>, Jann Horn <jannh@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linux API <linux-api@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v2 bpf-next 1/4] bpf: unprivileged BPF access via /dev/bpf

On Wed, 7 Aug 2019 at 06:24, Andy Lutomirski <luto@...nel.org> wrote:
> a) Those that, by design, control privileged operations.  This
> includes most attach calls, but it also includes allow_ptr_leaks,
> bpf_probe_read(), and quite a few other things.  It also includes all
> of the by_id calls, I think, unless some clever modification to the
> way they worked would isolate different users' objects.  I think that
> persistent objects can do pretty much everything that by_id users
> would need, so this isn't a big deal.

Slightly OT, since this is an implementation question: GET_MAP_FD_BY_ID
is useful to iterate a nested map. This isn't covered by rights to
persistent objects,
so it would need some thought.

-- 
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

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