linux-kernel - Re: [kernel-hardening] [RFC][PATCH 6/7] mm: Add Kconfig option for slab sanitization

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Date:	Tue, 22 Dec 2015 06:57:55 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	kernel-hardening@...ts.openwall.com,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Laura Abbott <laura@...bott.name>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [kernel-hardening] [RFC][PATCH 6/7] mm: Add Kconfig option for
 slab sanitization

On 12/21/2015 07:40 PM, Laura Abbott wrote:
> +	  The tradeoff is performance impact. The noticible impact can vary
> +	  and you are advised to test this feature on your expected workload
> +	  before deploying it

What if instead of writing SLAB_MEMORY_SANITIZE_VALUE, we wrote 0's?
That still destroys the information, but it has the positive effect of
allowing a kzalloc() call to avoid zeroing the slab object.  It might
mitigate some of the performance impact.

If this is on at compile time, but booted with sanitize_slab=off, is
there a performance impact?
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