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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20151008151144.GM17192@e104818-lin.cambridge.arm.com>
Date:	Thu, 8 Oct 2015 16:11:44 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Yury <yury.norov@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Salter <msalter@...hat.com>,
	Will Deacon <will.deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Klimov <klimov.linux@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	David Keitel <dkeitel@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 0/6] KASAN for arm64

On Thu, Oct 08, 2015 at 02:09:26PM +0200, Ard Biesheuvel wrote:
> On 8 October 2015 at 13:23, Andrey Ryabinin <ryabinin.a.a@...il.com> wrote:
> > 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.
> 
> Indeed. I did not mention instrumentation in the commit log for those
> patches, but obviously, something like KASAN instrumentation cannot be
> tolerated in the stub since it makes assumptions about the memory
> layout

I'll review your latest EFI stub isolation patches and try Kasan again
on top (most likely tomorrow).

Thanks.

-- 
Catalin
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/