linux-kernel - Re: [PATCH v2 2/3] mm/slub: Fix redzoning for small allocations

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Message-ID: <alpine.DEB.2.22.394.2010120754010.150059@www.lameter.com>
Date:   Mon, 12 Oct 2020 08:01:04 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Kees Cook <keescook@...omium.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>, stable@...r.kernel.org,
        Marco Elver <elver@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2 2/3] mm/slub: Fix redzoning for small allocations

On Fri, 9 Oct 2020, Kees Cook wrote:

> Store the freelist pointer out of line when object_size is smaller than
> sizeof(void *) and redzoning is enabled.
>
> (Note that no caches with such a size are known to exist in the kernel
> currently.)

Ummm... The smallest allowable cache size is sizeof(void *) as I recall.


mm/slab_common.c::kmem_sanity_check() checks the sizes when caches are
created.

NAK.