linux-kernel - Re: [PATCH v4 00/22] arm64: implement support for KASLR

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Message-ID: <CAKv+Gu_ANOm_skhVVBwK-1+yVP614FWeCo87aGN7iFjmUj95Ug@mail.gmail.com>
Date:	Fri, 29 Jan 2016 19:49:19 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	kernel-hardening@...ts.openwall.com,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Kees Cook <keescook@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Sharma Bhupesh <bhupesh.sharma@...escale.com>,
	Stuart Yoder <stuart.yoder@...escale.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Laura Abbott <labbott@...oraproject.org>
Subject: Re: [PATCH v4 00/22] arm64: implement support for KASLR

giOn 29 January 2016 at 19:26, Catalin Marinas <catalin.marinas@....com> wrote:
> Hi Ard,
>
> On Tue, Jan 26, 2016 at 06:10:27PM +0100, Ard Biesheuvel wrote:
>> Code can be found here:
>> git://git.linaro.org/people/ard.biesheuvel/linux-arm.git arm64-kaslr-v4a
>> https://git.linaro.org/people/ard.biesheuvel/linux-arm.git/shortlog/refs/heads/arm64-kaslr-v4a
>
> The overall series looks fine but I'd like more time to review the KASLR
> part together with the module PLT stuff.
>
> So could you please split this series in 2-3 parts for easy merging
> (possibly without the KASLR part, it depends on how the review goes)?

Sure

> It
> looks like a mix of features in random order like huge-vmap, relative
> extable, kernel memory layout changes, kernel load address, PIE and
> KASLR. So something like:
>
> 1. relative extable

This has been picked up by akpm in the mean time

> 2. huge-vmap

This is a single patch which is completely independent. I don't expect
it to conflict when applied in isolation.

> 3. kernel memory layout changes (moving kernel to the base of vmalloc
> range)
> 4. allow kernel loading at different phys offsets
> 5. module PLTs, relocations, PIE, relative kallsyms, KASLR

Relative kallsyms has also been picked up by akpm

> 6. efi_get_random_bytes
>
> 1-4 can be in the same branch but I currently find it hard to
> cherry-pick the non-PIE/non-KASLR patches without conflicts.
>

I think 3 logically coherent series that apply in sequence is
feasible. I will look into this on Monday

-- 
Ard.