linux-kernel - Re: [GIT PULL] x86/kaslr for v3.14

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Message-ID: <CA+55aFyxisSNKstMuanfrkhu5=2bxcu2cxZxMg38Zw0HAoXppg@mail.gmail.com>
Date:	Mon, 20 Jan 2014 14:54:12 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Cong Ding <dinggnu@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>, Ingo Molnar <mingo@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mathias Krause <minipli@...glemail.com>,
	Michael Davidson <md@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
Subject: Re: [GIT PULL] x86/kaslr for v3.14

So I pulled this, but one question:

On Mon, Jan 20, 2014 at 8:47 AM, H. Peter Anvin <hpa@...or.com> wrote:
> +config RANDOMIZE_BASE
> +       bool "Randomize the address of the kernel image"
> +       depends on RELOCATABLE
> +       depends on !HIBERNATION

How fundamental is that "!HIBERNATION" issue? Right now that
anti-dependency on hibernation support will mean that no distro kernel
will actually use the kernel address space randomization. Which
long-term is a problem.

I'm not sure HIBERNATION is really getting all that much use, but I
suspect distros would still want to support it.

Is it just a temporary "I wasn't able to make it work, need to get
some PM people involved", or is it something really fundamental?

            Linus
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