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Date: Wed, 11 Jan 2017 13:29:34 -0800
From: Kees Cook <>
To: Shubham Bansal <>
Cc: Daniel Borkmann <>, 
	"" <>, 
	"Reshetova, Elena" <>
Subject: Re: Looking for something to WORK ON

On Wed, Jan 11, 2017 at 4:46 AM, Shubham Bansal
<> wrote:
> On Wed, Jul 13, 2016 at 2:32 PM, Daniel Borkmann <>
> wrote:
>> Feel free to check out slides etc that are mostly located here:
>> 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 &&
>> 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 Cook
Nexus Security

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