linux-kernel - Re: [PATCH v6 00/11] Kernel address sanitizer

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Message-ID: <546BB58A.4080209@oracle.com>
Date:	Tue, 18 Nov 2014 16:09:30 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <a.ryabinin@...sung.com>
CC:	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Michal Marek <mmarek@...e.cz>,
	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>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-mm@...ck.org, Randy Dunlap <rdunlap@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Dave Jones <davej@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 00/11] Kernel address sanitizer - runtime memory debugger.

On 11/18/2014 03:58 PM, Andrew Morton wrote:
> On Tue, 11 Nov 2014 10:21:42 +0300 Andrey Ryabinin <a.ryabinin@...sung.com> wrote:
> 
>> Hi Andrew,
>>
>> Now we have stable GCC(4.9.2) which supports kasan and from my point of view patchset is ready for merging.
>> I could have sent v7 (it's just rebased v6), but I see no point in doing that and bothering people,
>> unless you are ready to take it.
> 
> It's a huge pile of tricky code we'll need to maintain.  To justify its
> inclusion I think we need to be confident that kasan will find a
> significant number of significant bugs that
> kmemcheck/debug_pagealloc/slub_debug failed to detect.
> 
> How do we get that confidence?  I've seen a small number of
> minorish-looking kasan-detected bug reports go past, maybe six or so. 
> That's in a 20-year-old code base, so one new minor bug discovered per
> three years?  Not worth it!

It's worth noting here that not all bugs discovered by kasan belong to
the -mm tree. Bugs which are more severe, such as:

	http://openwall.com/lists/oss-security/2014/07/17/1

Are the result of fuzzing with kasan. So while it's indeed not a huge number,
it's way more than 6 and not only minor issues.


Thanks,
Sasha
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