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

[Andrey Konovalov]

On Fri, Mar 3, 2017 at 3:39 PM, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> wrote:
>
>
> On 03/03/2017 04:52 PM, Alexander Potapenko wrote:
>> On Fri, Mar 3, 2017 at 2:31 PM, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> 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

Access can be inside or outside the object, so it's better to
specifically say that.

I think we can do (basically what Alexander suggested):

Object at ffff880068388540 belongs to the cache kmalloc-128 of size 128
Access 123 bytes inside of 128-byte region [ffff880068388540, ffff8800683885c0)

What do you think?