linux-hardening - Re: [PATCH v4] mempool: Do not use ksize() for poisoning

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Date:   Tue, 1 Nov 2022 10:15:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Anders Roxell <anders.roxell@...aro.org>,
        kernel test robot <oliver.sang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-mm@...ck.org, Andrey Konovalov <andreyknvl@...il.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v4] mempool: Do not use ksize() for poisoning

On Mon, Oct 31, 2022 at 04:00:25PM +0100, Vlastimil Babka wrote:
> From a4a5a40852723dfadb2429bee1d5e1f9d3b75f39 Mon Sep 17 00:00:00 2001
> From: Vlastimil Babka <vbabka@...e.cz>
> Date: Mon, 31 Oct 2022 15:55:47 +0100
> Subject: [PATCH] mempool: Do not use ksize() for poisoning-fix
> 
> For slab mempools (not kmalloc), pool_data is not object size, but a
> kmem_cache pointer; we need to extract the size via kmem_cache_size().
> 
> Reported-by: Anders Roxell <anders.roxell@...aro.org>
> Link: https://lore.kernel.org/all/20221031105514.GB69385@mutt/
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Link: https://lore.kernel.org/oe-lkp/202210312110.1fe5d224-oliver.sang@intel.com
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Reviewed-by: Kees Cook <keescook@...omium.org>

Thanks again for fixing this. I don't see it in -next yet? Should I
resend this directly, or how would be best to land it?

-Kees

-- 
Kees Cook