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

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Message-ID: <alpine.DEB.2.20.1704111326370.6378@east.gentwo.org>
Date:   Tue, 11 Apr 2017 13:30:33 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Kees Cook <keescook@...omium.org>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Add additional consistency check

On Fri, 31 Mar 2017, Kees Cook wrote:

> As found in PaX, this adds a cheap check on heap consistency, just to
> notice if things have gotten corrupted in the page lookup.

Ok this only affects kmem_cache_free() and not kfree(). For
kmem_cache_free() we already have a lot of stuff in the hotpath due to
cgruops. If you want this also for kfree() then we need a separate patch.

Also for kmem_cache_free(): Here we always have a slab cache and thus we
could check the flags that could modify what behavior we want.

Acked-by: Christoph Lameter <cl@...ux.com>