linux-kernel - Re: [v3] mm: Add SLUB free list pointer obfuscation

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Date:   Thu, 27 Jul 2017 10:15:26 -0500 (CDT)
From:   Christopher Lameter <cl@...ux.com>
To:     Kees Cook <keescook@...omium.org>
cc:     Alexander Popov <alex.popov@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Tejun Heo <tj@...nel.org>, Daniel Mack <daniel@...que.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Helge Deller <deller@....de>, Rik van Riel <riel@...hat.com>,
        Linux-MM <linux-mm@...ck.org>, Tycho Andersen <tycho@...ker.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [v3] mm: Add SLUB free list pointer obfuscation

On Wed, 26 Jul 2017, Kees Cook wrote:

> > Although in either case we are adding code to the fastpath...
>
> While I'd like it unconditionally, I think Alexander's proposal was to
> put it behind CONFIG_SLAB_FREELIST_HARDENED.

Sounds good.

> BTW, while I've got your attention, can you Ack the other patch? I
> sent a v4 for the pointer obfuscation, which we really need:
> https://lkml.org/lkml/2017/7/26/4

Just looked through it.