linux-kernel - Re: [PATCH v2] slab: Add POISON_POINTER_DELTA to ZERO_SIZE

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Message-ID: <alpine.DEB.2.20.1611181219250.27160@east.gentwo.org>
Date:   Fri, 18 Nov 2016 12:19:42 -0600 (CST)
From:   Christoph Lameter <cl@...ux.com>
To:     Kees Cook <keescook@...omium.org>
cc:     Michael Ellerman <mpe@...erman.id.au>,
        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>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v2] slab: Add POISON_POINTER_DELTA to ZERO_SIZE_PTR


On Fri, 18 Nov 2016, Kees Cook wrote:
> In this case, what about the original < ZERO_SIZE_PTR check Michael
> suggested? At least the one use in usercopy.c needs to be fixed, but
> otherwise, it should be fine?

Looks like it.