linux-kernel - Re: [PATCH 1/2] mm: Expand CONFIG_SLAB_FREELIST

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Date:   Wed, 17 Jun 2020 13:01:51 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>,
        Christoph Lameter <cl@...ux.com>,
        Alexander Popov <alex.popov@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, vinmenon@...eaurora.org,
        Matthew Garrett <mjg59@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Vijayanand Jitta <vjitta@...eaurora.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: Expand CONFIG_SLAB_FREELIST_HARDENED to include
 SLAB and SLOB

On Wed, Jun 17, 2020 at 12:53:48PM -0700, Kees Cook wrote:
> Include SLAB and SLOB caches when performing kmem_cache pointer

... SLOB?  Really?  Objects from different kmem caches are mixed together
on the same page with SLOB (at least last time I looked).  So how does
this work?

> verification. A defense against such corruption[1] should be applied
> to all the allocators. With this added, the "SLAB_FREE_CROSS" and
> "SLAB_FREE_PAGE" LKDTM tests now pass on SLAB: