Message-id: <53BE91E9.9090408@samsung.com>
Date: Thu, 10 Jul 2014 17:15:21 +0400
From: Andrey Ryabinin <a.ryabinin@samsung.com>
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To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
        Konstantin Serebryany <kcc@google.com>,
        Alexey Preobrazhensky <preobr@google.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Yuri Gribov <tetra2005@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>, Michal Marek <mmarek@suse.cz>,
        Russell King <linux@arm.linux.org.uk>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        x86@kernel.org, linux-mm@kvack.org
Subject: Re: [RFC/PATCH RESEND -next 05/21] x86: cpu: don't sanitize early
 stages of a secondary CPU boot
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On 07/09/14 23:33, Andi Kleen wrote:
> Andrey Ryabinin <a.ryabinin@samsung.com> writes:
> 
>> Instrumentation of this files may result in unbootable machine.
> 
> This doesn't make sense. Is the code not NMI safe? 
> If yes that would need to be fixed because
> 
> Please debug more.
> 

Sure.
It turns out that  KASAN_SANITIZE_perf_event.o := n is not needed here.
The problem only with common.c

> perf is a common source of bugs (see Vice Weaver's fuzzer results),
> so it would be good to have this functionality for it.
> 
> -Andi
> 

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