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Date: Fri, 29 Jan 2016 04:55:44 +0100
From: "Rafael J. Wysocki" <>
To: Laura Abbott <>
Cc: Andrew Morton <>, "Kirill A. Shutemov" <>, Vlastimil Babka <>, Michal Hocko <>, Pavel Machek <>, Len Brown <>,,,, Kees Cook <>,
Subject: Re: [PATCHv2 2/2] mm/page_poisoning.c: Allow for zero poisoning

On Thursday, January 28, 2016 06:38:19 PM Laura Abbott wrote:
> By default, page poisoning uses a poison value (0xaa) on free. If this
> is changed to 0, the page is not only sanitized but zeroing on alloc
> with __GFP_ZERO can be skipped as well. The tradeoff is that detecting
> corruption from the poisoning is harder to detect. This feature also
> cannot be used with hibernation since pages are not guaranteed to be
> zeroed after hibernation.
> Credit to Grsecurity/PaX team for inspiring this work
> Signed-off-by: Laura Abbott <>

The hibernation disabling part is fine by me.

Please feel free to add an ACK from me to this if that helps.


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