linux-kernel - Re: [RFC/PATCH RESEND -next 05/21] x86: cpu: don't sanitize early stages of a secondary CPU boot

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Date:	Thu, 10 Jul 2014 17:15:21 +0400
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Alexey Preobrazhensky <preobr@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Michal Marek <mmarek@...e.cz>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org, linux-mm@...ck.org
Subject: Re: [RFC/PATCH RESEND -next 05/21] x86: cpu: don't sanitize early
 stages of a secondary CPU boot

On 07/09/14 23:33, Andi Kleen wrote:
> Andrey Ryabinin <a.ryabinin@...sung.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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