linux-kernel - Re: [PATCH v6 04/18] khwasan, arm64: adjust shadow size for CONFIG_KASAN

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Message-ID: <CAAeHK+ySaS_jUe_wNQ192kE4bUgZUOMdSyQeRp5Tx2nCD41vBQ@mail.gmail.com>
Date:   Wed, 19 Sep 2018 19:27:52 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        "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-MM <linux-mm@...ck.org>,
        "open list:KERNEL BUILD + fi..." <linux-kbuild@...r.kernel.org>,
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        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
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        Jann Horn <jannh@...gle.com>,
        Mark Brand <markbrand@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Vishwath Mohan <vishwath@...gle.com>
Subject: Re: [PATCH v6 04/18] khwasan, arm64: adjust shadow size for CONFIG_KASAN_HW

On Wed, Sep 12, 2018 at 4:54 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Wed, Aug 29, 2018 at 1:35 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:

>>  /*
>> - * KASAN requires 1/8th of the kernel virtual address space for the shadow
>> - * region. KASAN can bloat the stack significantly, so double the (minimum)
>> - * stack size when KASAN is in use.
>> + * KASAN and KHWASAN require 1/8th and 1/16th of the kernel virtual address
>
>
> I am somewhat confused by the terminology.
> "KASAN" is not actually "CONFIG_KASAN" below, it is actually
> "CONFIG_KASAN_GENERIC". While "KHWASAN" translates to "KASAN_HW" few
> lines later.
> I think we need some consistent terminology for comments and config
> names until it's too late.
>

As per offline discussion will rename in v7.