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Date: Thu, 14 Apr 2016 22:01:02 +0200
From: Pavel Machek <>
To: Kees Cook <>
Cc: Linus Torvalds <>,
	"Rafael J. Wysocki" <>,
	Ingo Molnar <>, James Morse <>,
	Ard Biesheuvel <>,
	Matt Redfearn <>,
	Yves-Alexis Perez <>, Emrah Demir <>,
	Jonathan Corbet <>,,
	Len Brown <>, Borislav Petkov <>,
	Andy Lutomirski <>,,,,
Subject: Re: [PATCH v2] kaslr: allow kASLR to be default over Hibernation


> Since kASLR and Hibernation can not currently coexist at runtime
> on x86, the default behavior was to disable kASLR by default when
> CONFIG_HIBERNATION was present (to retain original behavior).
> The behavior of kASLR on arm64 (and soon MIPS) is to be enabled by
> default when selected at build time. Since arm64 Hibernation does not
> conflict with kASLR, this fixes the hibernation argument parsing to be
> x86-specific. Additionally, since end users want to be able to select
> kASLR on x86 by default at build time, create CONFIG_RANDOMIZE_BASE_ON
> that is present only on x86.
> Signed-off-by: Kees Cook <>

I believe this is bad idea. arm64 shows that kaslr and hibernation can
coexist, and hibernation is still useful when your battery runs out.

(cesky, pictures)

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