linux-kernel - Re: [PATCHv2 4/4] slub: Relax CMPXCHG consistency restrictions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.20.1602161033260.4158@east.gentwo.org>
Date:	Tue, 16 Feb 2016 10:33:42 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Laura Abbott <labbott@...oraproject.org>
cc:	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCHv2 4/4] slub: Relax CMPXCHG consistency restrictions

On Mon, 15 Feb 2016, Laura Abbott wrote:

> When debug options are enabled, cmpxchg on the page is disabled. This is
> because the page must be locked to ensure there are no false positives
> when performing consistency checks. Some debug options such as poisoning
> and red zoning only act on the object itself. There is no need to
> protect other CPUs from modification on only the object. Allow cmpxchg
> to happen with poisoning and red zoning are set on a slab.

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