Date: Tue, 26 Jan 2016 09:01:31 -0600 (CST) From: Christoph Lameter <cl@...ux.com> To: Joonsoo Kim <iamjoonsoo.kim@....com> cc: Laura Abbott <labbott@...oraproject.org>, Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org> 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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