linux-kernel - Re: [PATCH v6 0/6] KASAN for arm64

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Message-ID: <56165228.8060201@gmail.com>
Date:	Thu, 8 Oct 2015 14:23:20 +0300
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Mark Rutland <mark.rutland@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, Yury <yury.norov@...il.com>,
	Alexey Klimov <klimov.linux@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Keitel <dkeitel@...eaurora.org>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Mark Salter <msalter@...hat.com>, linux-efi@...r.kernel.org
Subject: Re: [PATCH v6 0/6] KASAN for arm64

On 10/08/2015 02:11 PM, Mark Rutland wrote:
> On Thu, Oct 08, 2015 at 01:36:09PM +0300, Andrey Ryabinin wrote:
>> 2015-10-07 13:04 GMT+03:00 Catalin Marinas <catalin.marinas@....com>:
>>> On Thu, Sep 17, 2015 at 12:38:06PM +0300, Andrey Ryabinin wrote:
>>>> As usual patches available in git
>>>>       git://github.com/aryabinin/linux.git kasan/arm64v6
>>>>
>>>> Changes since v5:
>>>>  - Rebase on top of 4.3-rc1
>>>>  - Fixed EFI boot.
>>>>  - Updated Doc/features/KASAN.
>>>
>>> I tried to merge these patches (apart from the x86 one which is already
>>> merged) but it still doesn't boot on Juno as an EFI application.
>>>
>>
>> 4.3-rc1 was ok and 4.3-rc4 is not. Break caused by 0ce3cc008ec04
>> ("arm64/efi: Fix boot crash by not padding between EFI_MEMORY_RUNTIME
>> regions")
>> It introduced sort() call in efi_get_virtmap().
>> sort() is generic kernel function and it's instrumented, so we crash
>> when KASAN tries to access shadow in sort().
> 
> I believe this is solved by Ard's stub isolation series [1,2], which
> will build a stub-specific copy of sort() and various other functions
> (see the arm-deps in [2]).
> 
> So long as the stub is not built with ASAN, that should work.

Thanks, this should help, as we already build the stub without ASAN instrumentation.

> 
> Mark.
> 
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/373807.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/373808.html
> 
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