linux-kernel - Re: [PATCH v3 21/39] kasan: don't allow SW_TAGS with ARM64

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Date:   Thu, 1 Oct 2020 23:57:09 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....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 v3 21/39] kasan: don't allow SW_TAGS with ARM64_MTE

On Thu, Oct 1, 2020 at 7:55 PM <elver@...gle.com> wrote:
>
> Does that patch title need an ", arm64" in it, like the others?

Yes, will fix in v4, thanks!

>
> On Fri, Sep 25, 2020 at 12:50AM +0200, Andrey Konovalov wrote:
> > Software tag-based KASAN provides its own tag checking machinery that
> > can conflict with MTE. Don't allow enabling software tag-based KASAN
> > when MTE is enabled.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> > Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> > ---
> > Change-Id: Icd29bd0c6b1d3d7a0ee3d50c20490f404d34fc97
> > ---
> >  arch/arm64/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index e7450fbd0aa7..e875db8e1c86 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -131,7 +131,7 @@ config ARM64
> >       select HAVE_ARCH_JUMP_LABEL
> >       select HAVE_ARCH_JUMP_LABEL_RELATIVE
> >       select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
> > -     select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
> > +     select HAVE_ARCH_KASAN_SW_TAGS if (HAVE_ARCH_KASAN && !ARM64_MTE)
> >       select HAVE_ARCH_KGDB
> >       select HAVE_ARCH_MMAP_RND_BITS
> >       select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
> > --
> > 2.28.0.681.g6f77f65b4e-goog
> >