linux-kernel - Re: [PATCH v10 00/22] kasan: add software tag-based mode for arm64

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Date:   Wed, 7 Nov 2018 16:54:05 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Jann Horn <jannh@...gle.com>,
        Mark Brand <markbrand@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Vishwath Mohan <vishwath@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Dave Martin <dave.martin@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        Paul Lawrence <paullawrence@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        kasan-dev@...glegroups.com,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-sparse@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v10 00/22] kasan: add software tag-based mode for arm64

On Wed, Nov 7, 2018 at 4:34 PM, Will Deacon <will.deacon@....com> wrote:
> On Wed, Nov 07, 2018 at 04:11:35PM +0100, Andrey Konovalov wrote:
>> On Wed, Nov 7, 2018 at 3:59 PM, Will Deacon <will.deacon@....com> wrote:
>> > On Wed, Nov 07, 2018 at 03:56:03PM +0100, Andrey Konovalov wrote:
>> >> On Tue, Nov 6, 2018 at 6:30 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>> >> > This patchset adds a new software tag-based mode to KASAN [1].
>> >> > (Initially this mode was called KHWASAN, but it got renamed,
>> >> >  see the naming rationale at the end of this section).
>> >>
>> >> [...]
>> >>
>> >> > Reviewed-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
>> >> > Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
>> >> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
>> >>
>> >> Hi Andrew,
>> >>
>> >> This patchset has now been reviewed-by KASAN maintainers. Could you
>> >> take a look and consider taking this into the -mm tree?
>> >
>> > I would much prefer to take the arm64 parts (which still need to be reviewed
>> > by Catalin afaict) via the arm64 tree, so please can you split those out
>> > separately?
>>
>> Which parts do you mean exactly, which patches? I don't think it makes
>> sense to split this patchset, as one part won't function without the
>> other.
>
> I would like the patches that touch code under arch/arm64/ to be reviewed by
> somebody from the arm64 community. Since the core parts have already been
> reviewed, I was suggesting that you could split them out so that they are
> not blocked by the architecture code. Is it not possible to preserve the
> existing KASAN behaviour for arm64 with the core parts merged? I figured it
> must be, since you're not touching any other architectures here and they
> assumedly continue to function correctly.
>
> However, if you'd rather keep everything together, please can we give it a
> couple of weeks so we can at least get the architecture bits reviewed? Most
> people are out at LPC next week (and I'm at another conference this week).
>
> Will