Date: Tue, 13 Feb 2018 11:38:08 +0000 From: Ard Biesheuvel <ard.biesheuvel@...aro.org> To: Kees Cook <keescook@...omium.org> Cc: Ahmed Soliman <ahmedsoliman0x666@...il.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com> Subject: Re: Hello world! Student interested in getting involved. On 12 February 2018 at 23:01, Kees Cook <keescook@...omium.org> wrote: > On Sat, Feb 10, 2018 at 11:18 AM, Ahmed Soliman > <ahmedsoliman0x666@...il.com> wrote: >> I am student, currently studying computer and communication engineering, My >> relevant academic background is undergraduate level courses in operating >> systems, system software, compiler theory, architecture, microprocessors. >> Well most of which are outdated stuff anyway but I have some ideas. My real > > Welcome to the list! > >> background comes from Playing CTFs in my free time (which is basically 24/7) >> doing mainly Reverse engineering and Binary exploitation, I have done 2~3 >> hello world kernel exploit dev for learning. so I have the basic knowledge, > > Excellent; CTFs can be extremely educational. There aren't enough > kernel CTFs, IMO. :) > >> And I use hand tweaked Gentoo! I have 1 documentation kernel patch \o/. > > Hey, that's a good place to start! What was fixed? > >> I am exploiting the fact that we shall be doing Software Engineering course >> This semester, so to enforce myself to get started developing for the >> kernel, I was guided here though long searching journey with #kernelnewbies >> and approaching many couple of maintainers in general. >> >> I always experienced people asking me even on kernelnewbies why I want to >> write stuff for kernel, well it is just for pure fun and I like doing almost >> low level security. And low level security requires being aware with kernel. >> Please just don't try to send me off. And I hope no one gets the wrong idea >> that I am only doing this for school. > > You've got the primary element: desire to work on it. :) There aren't > a lot of people interested in low level code, and even fewer > interested in security, so we'd love to help however we can. > >> Anyway I am interested in this implementing KASLR for ARM, I just wanted to >> make sure that no one is working on that because this is major school >> requirement, we are assumed to deliver a self contained "something" that >> isn't ours and not someone's else. > > Ard (now on CC) implemented a first-pass at this already, but it > likely needs some more tweaking and running down of any loose ends. > > See here: > http://www.openwall.com/lists/kernel-hardening/2017/08/14/2 > >> The reason I chose this one is that I think that is the only one that I >> understand (in a very abstract level) among all of them. so it should be the >> easiest way to kick start in my opinion. >> Assuming that I am right, I wanted to state that the only ARM32 hardware I >> own is raspberry pi zero, and Qemu of course, should that be enough please >> do let me know, and I would appreciate any reading materials provided I am >> already reading through wiki but there could be hidden gems that I missed. > > I'll let Ard take over; but between Qemu and real hardware you should > be set. One of the tricky parts of arm32 is how many earlier CPU types > there were, which can make some aspects more difficult to test. In the > worst case, you can just mark it as available on certain hardware. > The latest version of my kaslr branch is feature complete, but I get some hard to diagnose boot errors in automated boot testing on kernelci.org However, over the past few months I did not get a single query from anyone about how the work was progressing, and KASLR is a rather intrusive change, so I am reluctant to spend time and/or endorse others doing so for a feature that will require a substantial maintenance effort without any real benefit to anyone.
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