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

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Message-ID: <CACAyw9-MAXOsAz7DnCBq+32yc575TEiwm_6P-3KWKmZWmAqUfg@mail.gmail.com>
Date:   Wed, 26 Jun 2019 16:26:32 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Song Liu <songliubraving@...com>
Cc:     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>
Subject: Re: [PATCH bpf-next 1/4] bpf: unprivileged BPF access via /dev/bpf

On Wed, 26 Jun 2019 at 16:19, Song Liu <songliubraving@...com> wrote:
> > I know nothing about the scheduler, so pardon my ignorance. Does
> > TASK_BPF_FLAG_PERMITTED apply per user-space process, or per thread?
>
> It is per thread. clone() also clears the bit. I will make it more
> clear int the commit log.

In that case this is going to be very hard if not impossible to use
from languages that
don't allow controlling threads, aka Go. I'm sure there are other
examples as well.

Is it possible to make this per-process instead?

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

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