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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