linux-kernel - Re: [PATCH] kasan: Disable branch tracing for core runtime

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Date:   Tue, 19 May 2020 17:09:58 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Marco Elver <elver@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        kernel test robot <rong.a.chen@...el.com>
Subject: Re: [PATCH] kasan: Disable branch tracing for core runtime

On Tue, 19 May 2020 23:05:46 +0200 Andrey Konovalov <andreyknvl@...gle.com> wrote:

> On Tue, May 19, 2020 at 8:25 PM Marco Elver <elver@...gle.com> wrote:
> >
> > During early boot, while KASAN is not yet initialized, it is possible to
> > enter reporting code-path and end up in kasan_report(). While
> > uninitialized, the branch there prevents generating any reports,
> > however, under certain circumstances when branches are being traced
> > (TRACE_BRANCH_PROFILING), we may recurse deep enough to cause kernel
> > reboots without warning.
> >
> > To prevent similar issues in future, we should disable branch tracing
> > for the core runtime.
> >
> 
> ...
>
> Reviewed-by: Andrey Konovalov <andreyknvl@...gle.com>

Thanks, I queued this for 5.7.