linux-kernel - Re: [linux-next][PATCH v2] mm/slub.c: add a naive detection of double free or corruption

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Message-ID: <alpine.DEB.2.20.1708111225560.3131@nuc-kabylake>
Date:   Fri, 11 Aug 2017 12:26:19 -0500 (CDT)
From:   Christopher Lameter <cl@...ux.com>
To:     Alexander Popov <alex.popov@...ux.com>
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>,
        Paul E McKenney <paulmck@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>, linux-mm@...ck.org,
        Rik van Riel <riel@...hat.com>,
        Tycho Andersen <tycho@...ker.com>,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [linux-next][PATCH v2] mm/slub.c: add a naive detection of double
 free or corruption

On Fri, 11 Aug 2017, Alexander Popov wrote:

> Add an assertion similar to "fasttop" check in GNU C Library allocator
> as a part of SLAB_FREELIST_HARDENED feature. An object added to a singly
> linked freelist should not point to itself. That helps to detect some
> double free errors (e.g. CVE-2017-2636) without slub_debug and KASAN.

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