From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
"Alexei Starovoitov" <ast@kernel.org>,
luto@amacapital.net, davem@davemloft.net, peterz@infradead.org,
rostedt@goodmis.org, netdev@vger.kernel.org, bpf@vger.kernel.org,
kernel-team@fb.com, linux-api@vger.kernel.org
Subject: Re: [PATCH v2 bpf-next 1/3] capability: introduce CAP_BPF and CAP_TRACING
Date: Thu, 29 Aug 2019 14:10:55 -0700 [thread overview]
Message-ID: <20190829211053.5ani4al6mnhvvk5o@ast-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20190829222530.3c6163ac@carbon>
On Thu, Aug 29, 2019 at 10:25:30PM +0200, Jesper Dangaard Brouer wrote:
> On Thu, 29 Aug 2019 20:05:49 +0200
> Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> > Alexei Starovoitov <alexei.starovoitov@gmail.com> writes:
> >
> > > On Thu, Aug 29, 2019 at 09:44:18AM +0200, Toke Høiland-Jørgensen wrote:
> > >> Alexei Starovoitov <ast@kernel.org> writes:
> > >>
> > >> > CAP_BPF allows the following BPF operations:
> > >> > - Loading all types of BPF programs
> > >> > - Creating all types of BPF maps except:
> > >> > - stackmap that needs CAP_TRACING
> > >> > - devmap that needs CAP_NET_ADMIN
> > >> > - cpumap that needs CAP_SYS_ADMIN
> > >>
> > >> Why CAP_SYS_ADMIN instead of CAP_NET_ADMIN for cpumap?
> > >
> > > Currently it's cap_sys_admin and I think it should stay this way
> > > because it creates kthreads.
> >
> > Ah, right. I can sorta see that makes sense because of the kthreads, but
> > it also means that you can use all of XDP *except* cpumap with
> > CAP_NET_ADMIN+CAP_BPF. That is bound to create confusion, isn't it?
>
> Hmm... I see 'cpumap' primarily as a network stack feature. It is about
> starting the network stack on a specific CPU, allocating and building
> SKBs on that remote CPU. It can only be used together with XDP_REDIRECT.
> I would prefer CAP_NET_ADMIN like the devmap, to keep the XDP
> capabilities consistent.
I don't mind relaxing cpumap to cap_net_admin.
Looking at the reaction to the rest of the set. I'd rather discuss it
and do it later after basic cap_bpf is in.
next prev parent reply other threads:[~2019-08-29 21:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 5:12 [PATCH v2 bpf-next 1/3] capability: introduce CAP_BPF and CAP_TRACING Alexei Starovoitov
2019-08-29 5:12 ` [PATCH v2 bpf-next 2/3] bpf: implement CAP_BPF Alexei Starovoitov
2019-08-29 6:04 ` Song Liu
2019-08-29 17:28 ` Alexei Starovoitov
2019-08-29 15:32 ` Daniel Borkmann
2019-08-29 17:30 ` Alexei Starovoitov
2019-08-30 15:19 ` Nicolas Dichtel
2019-09-04 1:39 ` Alexei Starovoitov
2019-09-04 15:16 ` Daniel Borkmann
2019-09-04 15:21 ` Alexei Starovoitov
2019-09-05 8:37 ` Daniel Borkmann
2019-09-05 22:00 ` Alexei Starovoitov
2019-08-29 5:12 ` [PATCH v2 bpf-next 3/3] perf: implement CAP_TRACING Alexei Starovoitov
2019-08-29 6:06 ` Song Liu
2019-08-29 6:00 ` [PATCH v2 bpf-next 1/3] capability: introduce CAP_BPF and CAP_TRACING Song Liu
2019-08-29 7:44 ` Toke Høiland-Jørgensen
2019-08-29 17:24 ` Alexei Starovoitov
2019-08-29 18:05 ` Toke Høiland-Jørgensen
2019-08-29 20:25 ` Jesper Dangaard Brouer
2019-08-29 21:10 ` Alexei Starovoitov [this message]
2019-08-29 13:36 ` Nicolas Dichtel
2019-08-29 17:25 ` Alexei Starovoitov
2019-08-29 15:47 ` Daniel Borkmann
2019-08-29 16:28 ` Andy Lutomirski
2019-08-30 4:16 ` Alexei Starovoitov
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