linux-kernel - Re: [PATCH v6 0/6] KASan for arm

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Message-ID: <CACRpkdbqW2kJNdPi6JPupaHA_qRTWG-MsUxeCz0c38MRujOSSA@mail.gmail.com>
Date:   Tue, 2 Jul 2019 23:06:16 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Russell King <linux@...linux.org.uk>, christoffer.dall@....com,
        Marc Zyngier <marc.zyngier@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Nicolas Pitre <nico@...xnic.net>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Kees Cook <keescook@...omium.org>, jinb.park7@...il.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        liuwenliang@...wei.com, Rob Landley <rob@...dley.net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Thomas Gleixner <tglx@...utronix.de>, thgarnie@...gle.com,
        David Howells <dhowells@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Andre Przywara <andre.przywara@....com>,
        julien.thierry@....com, drjones@...hat.com, philip@....systems,
        mhocko@...e.com, kirill.shutemov@...ux.intel.com,
        kasan-dev@...glegroups.com,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvmarm@...ts.cs.columbia.edu,
        Andrey Ryabinin <ryabinin.a.a@...il.com>
Subject: Re: [PATCH v6 0/6] KASan for arm

Hi Florian,

On Tue, Jun 18, 2019 at 12:11 AM Florian Fainelli <f.fainelli@...il.com> wrote:

> Abbott submitted a v5 about a year ago here:
>
> and the series was not picked up since then, so I rebased it against
> v5.2-rc4 and re-tested it on a Brahma-B53 (ARMv8 running AArch32 mode)
> and Brahma-B15, both LPAE and test-kasan is consistent with the ARM64
> counter part.
>
> We were in a fairly good shape last time with a few different people
> having tested it, so I am hoping we can get that included for 5.4 if
> everything goes well.

Thanks for picking this up. I was trying out KASan in the past,
got sidetracked and honestly lost interest a bit because it was
boring. But I do realize that it is really neat, so I will try to help
out with some review and test on a bunch of hardware I have.

At one point I even had this running on the ARMv4 SA1100
(no joke!) and if I recall correctly, I got stuck because of things
that might very well have been related to using a very fragile
Arm testchip that later broke down completely in the l2cache
when we added the spectre/meltdown fixes.

I start reviewing and testing.

Yours,
Linus Walleij