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Date: Mon, 15 Sep 2014 09:24:41 -0700 From: Randy Dunlap <rdunlap@...radead.org> To: Andrey Ryabinin <a.ryabinin@...sung.com>, linux-kernel@...r.kernel.org 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>, Sasha Levin <sasha.levin@...cle.com>, Christoph Lameter <cl@...ux.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, 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, Michal Marek <mmarek@...e.cz>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Subject: Re: [RFC/PATCH v2 01/10] Add kernel address sanitizer infrastructure. On 09/15/14 08:28, Andrey Ryabinin wrote: > On 09/14/2014 05:35 AM, Randy Dunlap wrote: >> Following sentence is confusing. I'm not sure how to fix it. >> > > > Perhaps rephrase is like this: > > Do not use slub poisoning with KASan if user tracking enabled (iow slub_debug=PU). if user tracking is enabled > User tracking info (allocation/free stacktraces) are stored inside slub object's metadata. > Slub poisoning overwrites slub object and it's metadata with poison value on freeing. its > So if KASan will detect use after free, allocation/free stacktraces will be overwritten So if KASan detects a use after free, allocation/free stacktraces are overwritten > and KASan won't be able to print them. Thanks. -- ~Randy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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