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.