linux-kernel - Re: [PATCH 2/2] lib/test_kasan: Add stack overflow test

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Message-ID: <20190724112318.GC2624@lakrids.cambridge.arm.com>
Date:   Wed, 24 Jul 2019 12:23:19 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Marco Elver <elver@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [PATCH 2/2] lib/test_kasan: Add stack overflow test

On Tue, Jul 23, 2019 at 06:49:03PM +0200, Marco Elver wrote:
> On Tue, 23 Jul 2019 at 18:24, Mark Rutland <mark.rutland@....com> wrote:
> >
> > On Fri, Jul 19, 2019 at 03:28:18PM +0200, Marco Elver wrote:
> > > Adds a simple stack overflow test, to check the error being reported on
> > > an overflow. Without CONFIG_STACK_GUARD_PAGE, the result is typically
> > > some seemingly unrelated KASAN error message due to accessing random
> > > other memory.
> >
> > Can't we use the LKDTM_EXHAUST_STACK case to check this?
> >
> > I was also under the impression that the other KASAN self-tests weren't
> > fatal, and IIUC this will kill the kernel.
> >
> > Given that, and given this is testing non-KASAN functionality, I'm not
> > sure it makes sense to bundle this with the KASAN tests.
> 
> Thanks for pointing out LKDTM_EXHAUST_STACK.
> 
> This patch can be dropped!

Cool; it's always nice to find the work has already been done! :)

Thanks,
Mark.