linux-kernel - Re: [PATCH] Prefer kASLR over Hibernation

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Message-ID: <1459982506.30545.13.camel@tiscali.nl>
Date:	Thu, 07 Apr 2016 00:41:46 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Kees Cook <keescook@...omium.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Matt Redfearn <matt.redfearn@...tec.com>,
	Yves-Alexis Perez <corsac@...ian.org>,
	Emrah Demir <ed@...sec.com>, Jonathan Corbet <corbet@....net>,
	"x86@...nel.org" <x86@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Borislav Petkov <bp@...e.de>,
	Andy Lutomirski <luto@...nel.org>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH] Prefer kASLR over Hibernation

On wo, 2016-04-06 at 15:16 -0700, Kees Cook wrote:
> And it seems like Fedora either doesn't either, or has a lot of people
> for whom it doesn't work:
> https://bugzilla.redhat.com/show_bug.cgi?id=1206936
> https://bugzilla.redhat.com/show_bug.cgi?id=1224151
> http://blog.kriptonium.com/2015/12/fedora-23-hibernate.html

Which are all variations on a theme: add "resume=$SWAP" to your kernel
commandline, aren't they?

(No idea why that's needed since Fedora 22, but it cost me quite a bit
of head scratching to find out.)

Once that parameter was set hibernate functioned again on the few
laptops I, well, manage that run Fedora 22.

Thanks,


Paul Bolle