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Date: Thu, 12 Jan 2017 03:42:52 +0530
From: Shubham Bansal <illusionist.neo@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: kernel-hardening@...ts.openwall.com, 
	"Reshetova, Elena" <elena.reshetova@...el.com>, Daniel Borkmann <daniel@...earbox.net>
Subject: Re: Looking for something to WORK ON

Hi Kees,

I would have already started working on it since we last talked but before
that I wanted to check if anybody else is also not working on the same
thing. Otherwise it would be waste of time.

Anyways. I will start working on it. No point in postponing in.

Thanks,
Shubham

On Jan 12, 2017 2:59 AM, "Kees Cook" <keescook@...omium.org> wrote:

> On Wed, Jan 11, 2017 at 4:46 AM, Shubham Bansal
> <illusionist.neo@...il.com> wrote:
> >
> > On Wed, Jul 13, 2016 at 2:32 PM, Daniel Borkmann <daniel@...earbox.net>
> > wrote:
> >> Feel free to check out slides etc that are mostly located here:
> >>
> >>   https://github.com/iovisor/bpf-docs
> >>
> >> Also, Documentation/networking/filter.txt in the kernel tree provides
> some
> >> info as a starting point, an example of eBPF JIT can be found here
> >> arch/x86/net/
> >> in kernel tree.
> >>
> >> To give you a basic overview what JITs are still classic BPF (cBPF)
> ones:
> >>
> >> $ git grep -n "select HAVE_CBPF_JIT"
> >> arch/arm/Kconfig:44:    select HAVE_CBPF_JIT
> >> arch/mips/Kconfig:18:   select HAVE_CBPF_JIT if !CPU_MICROMIPS
> >> arch/powerpc/Kconfig:131:       select HAVE_CBPF_JIT if CPU_BIG_ENDIAN
> >> arch/sparc/Kconfig:35:  select HAVE_CBPF_JIT
> >>
> >> ... and which are eBPF (ppc64 one should get merged next window I
> >> believe):
> >>
> >> $ git grep -n "select HAVE_EBPF_JIT"
> >> arch/arm64/Kconfig:64:  select HAVE_EBPF_JIT
> >> arch/s390/Kconfig:131:  select HAVE_EBPF_JIT if PACK_STACK &&
> >> HAVE_MARCH_Z196_FEATURES
> >> arch/x86/Kconfig:94:    select HAVE_EBPF_JIT                    if
> X86_64
> >>
> >> Cheers,
> >> Daniel
> >
> > Hi Daniel,
> >
> > I have read about the EBPF and BFP. I wanted to start contributing. Do
> you
> > have any place for me to start with ?
> > I mailed you regarding the same few months ago but didn't get the reply.
>
> Daniel may have more ideas, but I would say taking a CBPF jit and
> converting it to an EBPF jit would be the best thing to start with.
>
> Doing ARM first might be easiest to tackle?
>
> -Kees
>
> --
> Kees Cook
> Nexus Security
>

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