netdev - Re: [PATCH v2 net-next 1/3] bpf: enable non-root eBPF programs

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Message-ID: <5617FD1C.2030702@iogearbox.net>
Date:	Fri, 09 Oct 2015 19:45:00 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"David S. Miller" <davem@...emloft.net>
CC:	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Kees Cook <keescook@...omium.org>, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/3] bpf: enable non-root eBPF programs

On 10/09/2015 07:30 PM, Alexei Starovoitov wrote:
...
> Openstack use case is different. There it will be prog_type_sched_cls
> that can mangle packets, change skb metadata, etc under TC framework.
> These are not suitable for all users and this patch leaves
> them root-only. If you're proposing to add CAP_BPF_TC to let containers
> use them without being CAP_SYS_ADMIN, then I agree, it is useful, but
> needs a lot more safety analysis on tc side.

Well, I think if so, then this would need to be something generic for
tc instead of being specific to a single (out of various) entities
inside the tc framework, but I currently doubt that this makes much
sense. If we allow to operate already at that level, then restricting
to CAP_SYS_ADMIN makes more sense in that specific context/subsys to me.

Best,
Daniel
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