linux-kernel - Re: [PATCH v6 00/18] khwasan: kernel hardware assisted address sanitizer

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Date:   Thu, 6 Sep 2018 13:06:23 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Will Deacon <will.deacon@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Catalin Marinas <catalin.marinas@....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 <kasan-dev@...glegroups.com>,
        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>,
        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>
Subject: Re: [PATCH v6 00/18] khwasan: kernel hardware assisted address sanitizer

On Thu, Sep 6, 2018 at 12:05 PM, Will Deacon <will.deacon@....com> wrote:
> On Wed, Sep 05, 2018 at 02:10:32PM -0700, Andrew Morton wrote:
>> On Wed, 29 Aug 2018 13:35:04 +0200 Andrey Konovalov <andreyknvl@...gle.com> wrote:
>>
>> > This patchset adds a new mode to KASAN [1], which is called KHWASAN
>> > (Kernel HardWare assisted Address SANitizer).
>>
>> We're at v6 and there are no reviewed-by's or acked-by's to be seen.
>> Is that a fair commentary on what has been happening, or have people
>> been remiss in sending and gathering such things?
>
> I still have concerns about the consequences of merging this as anything
> other than a debug option [1]. Unfortunately, merging it as a debug option
> defeats the whole point, so I think we need to spend more effort on developing
> tools that can help us to find and fix the subtle bugs which will arise from
> enabling tagged pointers in the kernel.

I totally don't mind calling it a debug option. Do I need to somehow
specify it somewhere?

Why does it defeat the point? The point is to ease KASAN-like testing
on devices with limited memory.