linux-kernel - Re: [PATCH RFC net-next 07/14] bpf: expand BPF syscall with program load/unload

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Message-ID: <CALCETrXDR1LVmbigTicBiddgvcucM1dGk1R7rxdJyBCvGEBQMw@mail.gmail.com>
Date:	Fri, 27 Jun 2014 17:19:24 -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 07/14] bpf: expand BPF syscall with program load/unload

On Fri, Jun 27, 2014 at 5:05 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
> eBPF programs are safe run-to-completion functions with load/unload
> methods from userspace similar to kernel modules.
>
> User space API:
>
> - load eBPF program
>   prog_id = bpf_prog_load(int prog_id, bpf_prog_type, struct nlattr *prog, int len)
>
>   where 'prog' is a sequence of sections (currently TEXT and LICENSE)
>   TEXT - array of eBPF instructions
>   LICENSE - GPL compatible


> +
> +       err = -EINVAL;
> +       /* look for mandatory license string */
> +       if (!tb[BPF_PROG_LICENSE])
> +               goto free_attr;
> +
> +       /* eBPF programs must be GPL compatible */
> +       if (!license_is_gpl_compatible(nla_data(tb[BPF_PROG_LICENSE])))
> +               goto free_attr;

Seriously?  My mind boggles.

--Andy
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