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

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Message-ID: <CAJZ5v0ir8PwyC2b1R0DaE+O5dH0cZUtrzTHxM4OAPxMY9hmNXA@mail.gmail.com>
Date:	Thu, 7 Apr 2016 00:04:59 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"Rafael J. Wysocki" <rafael@...nel.org>,
	Kees Cook <keescook@...omium.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, "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
Subject: Re: [PATCH] Prefer kASLR over Hibernation

On Wed, Apr 6, 2016 at 11:56 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Rafael J. Wysocki <rafael@...nel.org> wrote:
>
>> On Wed, Apr 6, 2016 at 9:44 PM, Kees Cook <keescook@...omium.org> wrote:
>> > When building with both CONFIG_HIBERNATION and CONFIG_RANDOMIZE_BASE,
>> > 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.
>> >
>> > Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
>> > Signed-off-by: Kees Cook <keescook@...omium.org>
>>
>> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>
>> Or do you want me to apply it?
>
> 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.

Thanks,
Rafael