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

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Message-ID: <CALCETrV3WLBmHewCZgfhCkjODWfq_byRg6sF7HpqZ6n9BVMBVQ@mail.gmail.com>
Date:	Fri, 27 Jun 2014 17:16:41 -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 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?

This question is brought to you by keyctl, which is terminally fucked.
At some point I'll generate some proof of concept exploits for severe
bugs caused by misdesign of a namespace.

--Andy
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