netdev - Re: [PATCH 1/6] ebpf: add a seccomp program type

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Date:	Wed, 09 Sep 2015 18:09:43 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Tycho Andersen <tycho.andersen@...onical.com>
CC:	Kees Cook <keescook@...omium.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Will Drewry <wad@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/6] ebpf: add a seccomp program type

On 09/09/2015 06:07 PM, Alexei Starovoitov wrote:
> On Wed, Sep 09, 2015 at 09:50:35AM -0600, Tycho Andersen wrote:
[...]
>> Thoughts?
>
> Please do not add any per-instruction hacks. None of them are
> necessary. Classic had to do extra ugly checks in seccomp only
> because verifier wasn't flexible enough.
> If you don't want to see any BPF_CALL in seccomp, just have
> empty get_func_proto() callback for BPF_PROG_TYPE_SECCOMP
> and verifier will reject all calls.
> Currently we have only two non-generic instrucitons
> LD_ABS and LD_IND that are avaialable for sockets/TC only,
> because these are legacy instructions and we had to make
> exceptions for them.

Yep, +1.
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