linux-kernel - Re: [PATCH v9 07/17] mm: slub: add kernel address sanitizer support for slub allocator

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Date:	Wed, 21 Jan 2015 15:47:13 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	linux-kernel@...r.kernel.org
CC:	Dmitry Chernenkov <dmitryc@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.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>, x86@...nel.org,
	linux-mm@...ck.org, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v9 07/17] mm: slub: add kernel address sanitizer support
 for slub allocator

On 01/21/2015 11:51 AM, Andrey Ryabinin wrote:
> With this patch kasan will be able to catch bugs in memory allocated
> by slub.
> Initially all objects in newly allocated slab page, marked as redzone.
> Later, when allocation of slub object happens, requested by caller
> number of bytes marked as accessible, and the rest of the object
> (including slub's metadata) marked as redzone (inaccessible).
> 
> 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.
> 
> Code in slub.c and slab_common.c files could validly access to object's
> metadata, so instrumentation for this files are disabled.

This one doesn't apply on -next. Is there a missing commit?

Applying: mm: slub: add kernel address sanitizer support for slub allocator
fatal: sha1 information is lacking or useless (mm/slub.c).
Repository lacks necessary blobs to fall back on 3-way merge.
Cannot fall back to three-way merge.
Patch failed at 0007 mm: slub: add kernel address sanitizer support for slub allocator
When you have resolved this problem run "git am --resolved".
If you would prefer to skip this patch, instead run "git am --skip".
To restore the original branch and stop patching run "git am --abort".


Thanks,
Sasha
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