Date: Tue, 11 Apr 2017 13:30:33 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
To: Kees Cook <keescook@chromium.org>
cc: Andrew Morton <akpm@linux-foundation.org>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: Add additional consistency check
In-Reply-To: <20170331164028.GA118828@beast>
Message-ID: <alpine.DEB.2.20.1704111326370.6378@east.gentwo.org>
References: <20170331164028.GA118828@beast>
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
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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@linux.com>