Re: [RFC][PATCH 0/3] Speed up SLUB poisoning + disable checks

[Christoph Lameter]

On Tue, 26 Jan 2016, Joonsoo Kim wrote:

> I doesn't follow up that discussion, but, I think that reusing
> SLAB_POISON for slab sanitization needs more changes. I assume that
> completeness and performance is matter for slab sanitization.
>
> 1) SLAB_POISON isn't applied to specific kmem_cache which has
> constructor or SLAB_DESTROY_BY_RCU flag. For debug, it's not necessary
> to be applied, but, for slab sanitization, it is better to apply it to
> all caches.

Those slabs can be legitimately accessed after the objects were freed. You
cannot sanitize nor poison.