Re: [PATCH 1/2] mm: Expand CONFIG_SLAB_FREELIST_HARDENED to include SLAB and SLOB

Kees Cook
2020-06-18T20:37:29Z

On Wed, Jun 17, 2020 at 01:01:51PM -0700, Matthew Wilcox wrote:
> 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?

Hmm. I'm not sure. I can't even boot a SLOB kernel these days (even
without these patches). But, pages are shared between kmem caches on
SLOB, then I certainly can't add this check for it. :) I'll adjust this
patch.

--
Kees Cook