linux-kernel - Re: [PATCH v7 16/41] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE

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Date:   Wed, 4 Nov 2020 20:11:05 +0100
From:   Vasily Gorbik <gor@...ux.ibm.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com, Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 16/41] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_*

On Mon, Nov 02, 2020 at 05:03:56PM +0100, Andrey Konovalov wrote:
> This is a preparatory commit for the upcoming addition of a new hardware
> tag-based (MTE-based) KASAN mode.
> 
> The new mode won't be using shadow memory, but will still use the concept
> of memory granules. Each memory granule maps to a single metadata entry:
> 8 bytes per one shadow byte for generic mode, 16 bytes per one shadow byte
> for software tag-based mode, and 16 bytes per one allocation tag for
> hardware tag-based mode.
> 
> Rename KASAN_SHADOW_SCALE_SIZE to KASAN_GRANULE_SIZE, and KASAN_SHADOW_MASK
> to KASAN_GRANULE_MASK.
> 
> Also use MASK when used as a mask, otherwise use SIZE.
> 
> No functional changes.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Reviewed-by: Marco Elver <elver@...gle.com>
> ---
> Change-Id: Iac733e2248aa9d29f6fc425d8946ba07cca73ecf
> ---
>  Documentation/dev-tools/kasan.rst |  2 +-
>  lib/test_kasan.c                  |  2 +-
>  mm/kasan/common.c                 | 39 ++++++++++++++++---------------
>  mm/kasan/generic.c                | 14 +++++------
>  mm/kasan/generic_report.c         |  8 +++----
>  mm/kasan/init.c                   |  8 +++----
>  mm/kasan/kasan.h                  |  4 ++--
>  mm/kasan/report.c                 | 10 ++++----
>  mm/kasan/tags_report.c            |  2 +-
>  9 files changed, 45 insertions(+), 44 deletions(-)

hm, this one got escaped somehow

lib/test_kasan_module.c:
18 #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE)