Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Wed, 6 Apr 2016 22:17:16 +0200
From: Pavel Machek <>
To: Kees Cook <>
Cc: Linus Torvalds <>,
	Ard Biesheuvel <>,
	Matt Redfearn <>,
	Yves-Alexis Perez <>, Emrah Demir <>,
	Jonathan Corbet <>,,
	"Rafael J. Wysocki" <>,
	Len Brown <>, Borislav Petkov <>,
	Andy Lutomirski <>,,,,
Subject: Re: [PATCH] Prefer kASLR over Hibernation


> one or the other must be chosen at boot-time. Until now, hibernation
> was selected when no choice was made on the command line.
> To make the security benefits of kASLR more widely available to end
> users (since the use of hibernation is becoming more rare and kASLR,
> already available on x86, will be available on arm64 and MIPS soon),
> this changes the default to preferring kASLR over hibernation. Users
> wanting hibernation can turn off kASLR by adding "nokaslr" to the kernel
> command line.

I must say I don't exactly like this patch.

Why is kASLR incompatible with hibernation? We can hibernate have 
4.3 kernel resume hibernation image of 4.2 kernel (on x86-64, and I
have patches for x86). Resuming kernel with different randomization
does not look that much different...

Best regards,
(cesky, pictures)

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