linux-kernel - Re: [RFC 0/3] ABI spec

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Message-ID: <20161123143703.GC3218@sasha-lappy>
Date:   Wed, 23 Nov 2016 14:36:56 +0000
From:   alexander.levin@...izon.com
To:     Dmitry Vyukov <dvyukov@...gle.com>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "scientist@...com" <scientist@...com>,
        "glider@...gle.com" <glider@...gle.com>,
        "andreyknvl@...gle.com" <andreyknvl@...gle.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Nicholas Mc Guire" <der.herr@...r.at>
Subject: Re: [RFC 0/3] ABI spec - verification

On Mon, Nov 21, 2016 at 03:25:05PM +0100, Dmitry Vyukov wrote:
> On Wed, Nov 16, 2016 at 6:37 PM,  <alexander.levin@...izon.com> wrote:
> > As discussed at plumbers, having a standard spec for the kernel's ABI has
> > quite a few uses and enough people wanted it to get the ball rolling.
> >
> > We agreed that it's desirable to have something that can be used from code
> > rather than just a spec on paper both for validation and allowing other users
> > (like fuzzers, userspace libraries, and various userspace tools) to build
> > on that.
> >
> > What we ended up deciding on at plumbers is:
> >
> >  - I'll do a few kernel bits do demonstrate how we can validate the spec from
> > the kernel.
> >  - Dmitry Vyukov will provide a way to translate syzkaller's syscall
> > documentation into something that can be easily used in the kernel and
> > userspace.
> >  - Various projects will attempt to integrate it to make sure that the
> > framework works for them.
> >
> > Once those bits are done we can focus on getting the spec right, and we'll
> > have a good way to validate our work both in userspace and in the kernel.
> >
> > This patchset is a basic draft of said kernel bits. I mostly want to make
> > sure that Dmitry and myself are on the same page as to how integration will
> > look like, but also to open it to criticism and suggestions (bikeshedding).
> 
> 
> Looks like a good starting point!
> 
> Do you have a git repo with this somewhere? I have problems applying
> the patches, seems that my gmail messed them with some weird escaping.

I've pushed it to https://git.kernel.org/cgit/linux/kernel/git/sashal/linux.git/log/?h=abi_spec ,
will try to keep it updated.

> Is the intention that these descriptions are written by hand, or
> generated from some DSL?
> I benefited from easier to write descriptions, also I changed several
> times what code generator generates without changing descriptions.
> However, an additional level of indirection in the form of code
> generator introduces own pain to maintain. So I am not too strong
> here.

I would really to have the descriptions written in just *one* place, either
by hand the way I did in that example, or in DSL. I understand your point about
another level of indirection, but I'm afraid that if we don't force a monolithic
spec we'll end up with way more than 2 different descriptions to maintain.

-- 

Thanks,
Sasha