linux-kernel - Re: [PATCH 09/11] kasan: docs: update shadow memory section

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Date:   Fri, 12 Mar 2021 14:52:52 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/11] kasan: docs: update shadow memory section

On Fri, Mar 12, 2021 at 11:52 AM Marco Elver <elver@...gle.com> wrote:
>
> On Thu, Mar 11, 2021 at 10:37PM +0100, Andrey Konovalov wrote:
> [...]
> > -The kernel maps memory in a number of different parts of the address
> > -space. This poses something of a problem for KASAN, which requires
> > -that all addresses accessed by instrumented code have a valid shadow
> > -region.
> > -
> > -The range of kernel virtual addresses is large: there is not enough
> > -real memory to support a real shadow region for every address that
> > -could be accessed by the kernel.
> > +The kernel maps memory in several different parts of the address space.
> > +The range of kernel virtual addresses is large: there is not enough real
> > +memory to support a real shadow region for every address that could be
> > +accessed by the kernel. Therefore, KASAN only maps real shadow for certain
> > +parts of the address space.
> >
> >  By default
> >  ~~~~~~~~~~
>
> While we're here, can we change this "By default" heading which seems
> wrong -- the paragraph starts with "By default, ..." as well.
>
> Perhaps "Default Behaviour"?

Sounds good, thanks!