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

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Message-ID: <CAPAsAGxpzLUiWXzPXHWQ+DaggccB1-x1g3-LeOWpGWXMWAp2fg@mail.gmail.com>
Date:	Thu, 22 Jan 2015 01:48:44 +0400
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	LKML <linux-kernel@...r.kernel.org>,
	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" <x86@...nel.org>,
	"linux-mm@...ck.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

2015-01-21 23:47 GMT+03:00 Sasha Levin <sasha.levin@...cle.com>:
> 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?
>

I don't see anything wrong. It's just difference between torvalds/-next trees.
Attached patched for -next just in case.

Also there is trivial conflict with -next in 11/17 patch.

> 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
>

View attachment "mm-slub-add-kernel-address-sanitizer-support-for-slu.patch" of type "text/x-patch" (14891 bytes)