linux-kernel - Re: [PATCH RFC v2 net-next 10/16] bpf: add eBPF verifier

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Message-ID: <CALCETrUt1yLXTt5pDZJd0s4s+4dhs0LB7tbJYd6p1+EbdNWw7w@mail.gmail.com>
Date:	Thu, 24 Jul 2014 11:25:23 -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 v2 net-next 10/16] bpf: add eBPF verifier

On Thu, Jul 17, 2014 at 9:20 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
> Safety of eBPF programs is statically determined by the verifier, which detects:
> - loops
> - out of range jumps
> - unreachable instructions
> - invalid instructions
> - uninitialized register access
> - uninitialized stack access
> - misaligned stack access
> - out of range stack access
> - invalid calling convention

Is there something that documents exactly what conditions an eBPF
program must satisfy in order to be considered valid?

--Andy
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