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Date: Sun, 10 Jul 2016 21:29:08 +0200
From: Stephan Mueller <smueller@...onox.de>
To: Shubham Bansal <illusionist.neo@...il.com>
Cc: kernel-hardening@...ts.openwall.com, sandyinchina@...il.com, tytso@....edu, keescook@...omium.org, jsd@...n.com
Subject: Re: Looking for something to WORK ON
Am Sonntag, 10. Juli 2016, 22:12:53 CEST schrieb Shubham Bansal:
Hi Shubham,
> Hi Sandy,
>
> On Wed, Jul 6, 2016 at 8:44 PM, Sandy Harris <sandyinchina@...il.com> wrote:
> > Shubham Bansal <illusionist.neo@...il.com> wrote:
> > > I want to start with linux kernel development and looking for some
> >
> > project
> >
> > > where I can contribute.
> >
> > Nearly all crypto and the address randomisation that is part of kernel
> > hardening depend on good random numbers, for Linux on the random(4)
> > driver. Getting it initialised early enough & well enough is an
> > extremely tricky problem. Several people have proposed solutions but
> > AFAIK none are complete and it might benefit from having fresh eyes
> > take a look, especially if you have a good background in crypto or
> > math.
>
> I have a basic understanding of crypto as I just graduated. But it sound
> really interesting to work on. I am happy to work on it if you think it
> would be good, But I must tell you that I have to read a lot for this.
>
> > Not all discussion is here; other relevant lists include
> > linux-crypto@...r.kernel.org and cryptography@...zdowd.com.
>
> Subscribed.
>
> > People to
> > look for include the maintainer, tytso@....edu, the main person
> > working on the problem here, keescook@...omium.org,
>
> Should I mail them to get the update and how can I start contributing ?
>
> > two guys who have
> > proposed drive rewrites that partly solve the problem, me and
> > smueller@...onox.de, and one with a lot of excellent comments,
> > jsd@...n.com.
>
> Would it be possible to work with you on this ? I would try my best. I
> would need some help from your side though.
>
> Looking forward to hearing back from you. I would like to get started with
> it soon.
My code is in the kernel at crypto/jitterentropy.c. It is completely
standalone and does not require anything, provided the intended architecture
has either random_get_entropy() or get_cycles implemented. I have tested it on
bare metal without a kernel. Thus, it can be operational as early as you need
it.
To make it fully standalone, you have to:
- compile jitterentropy.c and the helper functions listed at the top in
jitterentropy.c and implemented in jitterentropy_kcapi.c (note,
jent_fips_enabled is not needed for your purpose)
- statically allocate the memory obtained in jent_entropy_collector_alloc
- ensure serialization as necessary
I strongly suggest that you call jent_entropy_init to ensure that the timer
has a sufficient high resolution before you collect entropy with
jent_read_entropy.
Note, I am currently getting help from a big chip vendor tracking down the
root cause that beyond the analysis of chapter 6.1 in my report.
Ciao
Stephan
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