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

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Date:   Wed, 4 Nov 2020 20:32:44 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Vasily Gorbik <gor@...ux.ibm.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev <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 <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 16/41] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_*

On Wed, Nov 4, 2020 at 8:30 PM Vasily Gorbik <gor@...ux.ibm.com> wrote:
>
> On Wed, Nov 04, 2020 at 08:22:07PM +0100, Andrey Konovalov wrote:
> > On Wed, Nov 4, 2020 at 8:11 PM Vasily Gorbik <gor@...ux.ibm.com> wrote:
> > >
> > > 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)
> >
> > You mean it's not on the patch? It is, almost at the very top.
>
> lib/test_kasan_module.c != lib/test_kasan.c
>
> I fetched your branch. And I had to fix it up to build old good kasan
> test module CONFIG_TEST_KASAN_MODULE=m

Ah, right, it was just recently merged into mainline, that's why it's
missing. Thanks for noticing!