linux-kernel - Re: [PATCH v10 09/12] arch/x86: enable task isolation functionality

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Date:	Wed, 9 Mar 2016 13:07:55 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Chris Metcalf <cmetcalf@...lanox.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	Gilad Ben Yossef <giladb@...hip.com>,
	Will Deacon <will.deacon@....com>,
	Rik van Riel <riel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v10 09/12] arch/x86: enable task isolation functionality

On Wed, Mar 9, 2016 at 1:05 PM, Chris Metcalf <cmetcalf@...lanox.com> wrote:
> On 3/9/2016 3:58 PM, Andy Lutomirski wrote:
>>>
>>> My preference would be not to have to require all task-isolation users
>>> >to also figure out all the complexities of creating BPF programs, so
>>> >my intention is to have task isolation automatically generate a BPF
>>> >program (just allowing prctl/exit/exit_group and failing everything
>>> >else with SIGSYS).  To support having it work this way, I open up
>>> >the seccomp stuff a little so that kernel clients can effectively
>>> >push/pop a BPF program into seccomp:
>>
>> That sounds like a great use case for the new libtaskisolation that
>> someone is surely writing:)
>
>
> Happily, task isolation is so simple an API that all that is needed is a
> prctl().
>
> ... Unless somehow a requirement to inflict a huge blob of eBPF into the
> kernel
> just to use task isolation safely is added, of course :-)
>

BPF, not eBPF.  Also, it's a tiny blob.

And this still has nothing to do with using it safely.  This has to do
with catching your own bugs.

--Andy

>
> --
> Chris Metcalf, Mellanox Technologies
> http://www.mellanox.com
>



-- 
Andy Lutomirski
AMA Capital Management, LLC