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

[Andy Lutomirski]

On Wed, Mar 9, 2016 at 1:05 PM, Chris Metcalf <cmetcalf@xxxxxxxxxxxx> 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