linux-kernel - Re: [PATCH] mm: Add additional consistency check

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Date:   Mon, 3 Apr 2017 09:03:50 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Michael Ellerman <mpe@...erman.id.au>
cc:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Add additional consistency check

On Mon, 3 Apr 2017, Michael Ellerman wrote:

> At least in slab.c it seems that would allow you to "free" an object
> from one kmem_cache onto the array_cache of another kmem_cache, which
> seems fishy. But maybe there's a check somewhere I'm missing?

kfree can be used to free any object from any slab cache.

kmem_cache_free() checks if the object belongs to the cache given.