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

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Date:	Thu, 7 Apr 2016 02:49:58 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Pavel Machek <pavel@...x.de>,
	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>,
	the arch/x86 maintainers <x86@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, 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


* Rafael J. Wysocki <rafael@...nel.org> wrote:

> [...]
> 
> One of the weak points is the final jump, because it has to be done to the 
> physical location of the image kernel's entry point even though the virtual 
> addresses of it may differ between the boot and the image kernels.  The seed is 
> not needed for that, only the physical address of the entry point.  The boot 
> kernel doesn't have it today, though, because the virtual address of that is 
> passed in the image header. That should not be too difficult to change, however.

I didn't realize we jumped to the image kernel as well - I (wrongly) assumed we 
kept the bootup kernel. That should indeed make hibernation mostly 
kASLR-invariant.

Thanks,

	Ingo