linux-kernel - Re: [PATCH RFC net-next 03/14] bpf: introduce syscall(BPF, ...) and BPF maps

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Date:	Fri, 27 Jun 2014 23:25:39 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Chema Gonzalez <chema@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC net-next 03/14] bpf: introduce syscall(BPF, ...) and
 BPF maps

On Fri, Jun 27, 2014 at 10:55 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
> On Fri, Jun 27, 2014 at 5:16 PM, Andy Lutomirski <luto@...capital.net> wrote:
>> On Fri, Jun 27, 2014 at 5:05 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
>>> BPF syscall is a demux for different BPF releated commands.
>>>
>>> 'maps' is a generic storage of different types for sharing data between kernel
>>> and userspace.
>>>
>>> The maps can be created/deleted from user space via BPF syscall:
>>> - create a map with given id, type and attributes
>>>   map_id = bpf_map_create(int map_id, map_type, struct nlattr *attr, int len)
>>>   returns positive map id or negative error
>>>
>>> - delete map with given map id
>>>   err = bpf_map_delete(int map_id)
>>>   returns zero or negative error
>>
>> What's the scope of "id"?  How is it secured?
>
> the map and program id space is global and it's cap_sys_admin only.
> There is no pressing need to do it with per-user limits.
> So the whole thing is root only for now.
>

Hmm.  This may be unpleasant if you ever want to support non-root or
namespaced operation.

How hard would it be to give these things fds?

> Since I got your attention please review the most interesting
> verifier bits (patch 08/14) ;)

Will do.  Or at least I'll try :)

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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