linux-kernel - Re: [RFC/PATCH RESEND -next 15/21] mm: slub: add kernel address sanitizer hooks to slub allocator

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Message-ID: <alpine.DEB.2.11.1407090947020.1384@gentwo.org>
Date:	Wed, 9 Jul 2014 09:48:41 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>
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>,
	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 15/21] mm: slub: add kernel address
 sanitizer hooks to slub allocator

On Wed, 9 Jul 2014, Andrey Ryabinin wrote:

> With this patch kasan will be able to catch bugs in memory allocated
> by slub.
> Allocated slab page, this whole page marked as unaccessible
> in corresponding shadow memory.
> On allocation of slub object requested allocation size marked as
> accessible, and the rest of the object (including slub's metadata)
> marked as redzone (unaccessible).
>
> We also mark object as accessible if ksize was called for this object.
> There is some places in kernel where ksize function is called to inquire
> size of really allocated area. Such callers could validly access whole
> allocated memory, so it should be marked as accessible by kasan_krealloc call.

Do you really need to go through all of this? Add the hooks to
kmem_cache_alloc_trace() instead and use the existing instrumentation
that is there for other purposes?
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