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

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Message-ID: <YEtH3oADQeTx1+bK@elver.google.com>
Date:   Fri, 12 Mar 2021 11:52:14 +0100
From:   Marco Elver <elver@...gle.com>
To:     Andrey Konovalov <andreyknvl@...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@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/11] kasan: docs: update shadow memory section

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"?