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Date: Wed, 13 Jul 2016 11:02:50 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: Shubham Bansal <illusionist.neo@...il.com>,
Kees Cook <keescook@...omium.org>
CC: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
"Reshetova, Elena" <elena.reshetova@...el.com>
Subject: Re: Looking for something to WORK ON
Hi Shubham,
On 07/13/2016 09:37 AM, Shubham Bansal wrote:
> Hi,
>
>> So overall I have 3 options :
>>>
>>> PaX's UDEREF feature - I want to work on this if its needed
>>
>> This is a large project.
>>
> I am happy to do it. Do you have anything where I can start ? I might need
> someone who could guide me through it. It would be great if you could.
>
>>
>>> PAN emulation on ARMv8.0 - My second preference would be this.
>>
>> This sounds like it requires more research?
>>
>>> Convert remaining BPF JITs to eBPF JIT (with blinding) - Happy to do it
>> if
>>> need
>>
>> I think this has value and there are folks that can help direct you
>> through this. Since you're new to kernel development, maybe start here
>> to get a sense of the amount of work needed, and then go from there?
>>
> Okay. I will start here. I will keep the PAX's UDREF feature in the
> background and start working on this. I will reach out to Daniel Borkmann
> and Elena Reshetova for the starting pointers.
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
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