linux-kernel - Re: [PATCH v5 6/6] kasan: Forbid kunit tests when async mode is enabled

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Date:   Fri, 22 Jan 2021 12:00:08 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Will Deacon <will@...nel.org>,
        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>,
        Branislav Rankov <Branislav.Rankov@....com>
Subject: Re: [PATCH v5 6/6] kasan: Forbid kunit tests when async mode is
 enabled

On Thu, Jan 21, 2021 at 06:40:35PM +0100, Andrey Konovalov wrote:
> On Thu, Jan 21, 2021 at 5:40 PM Vincenzo Frascino
> <vincenzo.frascino@....com> wrote:
> >
> > Architectures supported by KASAN_HW_TAGS can provide a sync or async
> > mode of execution. KASAN KUNIT tests can be executed only when sync
> > mode is enabled.
> >
> > Forbid the execution of the KASAN KUNIT tests when async mode is
> > enabled.
> >
> > Cc: Dmitry Vyukov <dvyukov@...gle.com>
> > Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> > Cc: Alexander Potapenko <glider@...gle.com>
> > Cc: Andrey Konovalov <andreyknvl@...gle.com>
> > Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> > ---
> >  lib/test_kasan.c | 5 +++++
> >  mm/kasan/kasan.h | 2 ++
> >  2 files changed, 7 insertions(+)
> >
> > diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> > index 7285dcf9fcc1..1306f707b4fe 100644
> > --- a/lib/test_kasan.c
> > +++ b/lib/test_kasan.c
> > @@ -52,6 +52,11 @@ static int kasan_test_init(struct kunit *test)
> >                 return -1;
> >         }
> >
> > +       if (!hw_is_mode_sync()) {
> > +               kunit_err(test, "can't run KASAN tests in async mode");
> > +               return -1;
> > +       }
> 
> I'd rather implement this check at the KASAN level, than in arm64
> code. Just the way kasan_stack_collection_enabled() is implemented.
> 
> Feel free to drop this change and the previous patch, I'll implement
> this myself later.

I agree, it makes sense.

-- 
Catalin