Re: [PATCH v2] mm/slub: support left redzone

[Andrey Ryabinin]

2016-02-26 7:36 GMT+03:00  <js1304@xxxxxxxxx>:
> From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
>
> SLUB already has a redzone debugging feature.  But it is only positioned
> at the end of object (aka right redzone) so it cannot catch left oob.
> Although current object's right redzone acts as left redzone of next
> object, first object in a slab cannot take advantage of this effect.  This
> patch explicitly adds a left red zone to each object to detect left oob
> more precisely.
>

So why for each object? Can't we have left redzone only for the first object?