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Date: Tue, 26 Jan 2016 09:01:31 -0600 (CST)
From: Christoph Lameter <>
To: Joonsoo Kim <>
cc: Laura Abbott <>, 
    Pekka Enberg <>, David Rientjes <>, 
    Andrew Morton <>,,,, 
    Kees Cook <>
Subject: Re: [RFC][PATCH 0/3] Speed up SLUB poisoning + disable checks

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.

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