linux-kernel - Re: [PATCH v2 6/9] kasan: improve slab object description

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Date:   Fri, 3 Mar 2017 17:39:03 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Alexander Potapenko <glider@...gle.com>
CC:     Andrey Konovalov <andreyknvl@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] kasan: improve slab object description



On 03/03/2017 04:52 PM, Alexander Potapenko wrote:
> On Fri, Mar 3, 2017 at 2:31 PM, Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
>> On 03/02/2017 04:48 PM, Andrey Konovalov wrote:
>>> Changes slab object description from:
>>>
>>> Object at ffff880068388540, in cache kmalloc-128 size: 128
>>>
>>> to:
>>>
>>> The buggy address belongs to the object at ffff880068388540
>>>  which belongs to the cache kmalloc-128 of size 128
>>> The buggy address is located 123 bytes inside of
>>>  128-byte region [ffff880068388540, ffff8800683885c0)
>>>
>>> Makes it more explanatory and adds information about relative offset
>>> of the accessed address to the start of the object.
>>>
>>
>> I don't think that this is an improvement. You replaced one simple line with a huge
>> and hard to parse text without giving any new/useful information.
>> Except maybe offset, it useful sometimes, so wouldn't mind adding it to description.
> Agreed.
> How about:
> ===========
> Access 123 bytes inside of 128-byte region [ffff880068388540, ffff8800683885c0)
> Object at ffff880068388540 belongs to the cache kmalloc-128
> ===========
> ?
> 

I would just add the offset in the end:
	Object at ffff880068388540, in cache kmalloc-128 size: 128 accessed at offset y