Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Thu, 7 Apr 2016 02:05:43 +0200
From: Ingo Molnar <>
To: Kees Cook <>
Cc: "Rafael J. Wysocki" <>,
	Linus Torvalds <>,
	Ard Biesheuvel <>,
	Matt Redfearn <>,
	Yves-Alexis Perez <>, Emrah Demir <>,
	Jonathan Corbet <>, "" <>,
	"Rafael J. Wysocki" <>,
	Len Brown <>, Pavel Machek <>,
	Borislav Petkov <>, Andy Lutomirski <>,
	"open list:DOCUMENTATION" <>,
	"" <>,
	Linux Kernel Mailing List <>,
	"" <>
Subject: Re: [PATCH] Prefer kASLR over Hibernation

* Kees Cook <> wrote:

> >> I don't think this is a good idea, as it turns off emergency hibernation of 
> >> laptops - many desktop distros support it by default.
> >
> > Right, I forgot about this one.
> When I last checked Ubuntu doesn't enable hibernation by default any more: 
> And it seems like Fedora either doesn't either, or has a lot of people
> for whom it doesn't work:

Ok, that's a relatively recent development, I distinctly remember my laptop being 
hibernated in such a fashion fairly recently.

That makes it easier to hack around the kASLR incompatibility by making 
hibernation less useful. Personally I think that conceptually user space 
persistency (CRIU et al) is superior to kernel level hibernation - but
user-space save/restore is nowhere near as complete as kernel hibernation,
so it's still somewhat sad that it doesn't work ...



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