linux-kernel - Re: [PATCH 0/2] make kASLR vs hibernation boot-time selectable

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Message-ID: <CAGXu5jJSqV2MeuofJP4OEiDytQBqKMgC3cj+tguiwTmpRX1wSQ@mail.gmail.com>
Date:	Fri, 13 Jun 2014 17:08:21 -0700
From:	Kees Cook <keescook@...omium.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Pavel Machek <pavel@....cz>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>, Len Brown <len.brown@...el.com>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH 0/2] make kASLR vs hibernation boot-time selectable

On Fri, Jun 13, 2014 at 5:14 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Friday, June 13, 2014 03:59:57 PM Kees Cook wrote:
>> On Fri, Jun 13, 2014 at 3:54 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> > On Friday, June 13, 2014 03:07:19 PM Kees Cook wrote:
>
> [cut]
>
>> > I'll have a closer look at that shortly (it's been quite some time since
>> > I wrote that code).
>>
>> Thanks; I'm trying to get a test environment instrumented too so I can
>> look at this. (At the very least, it sounds like we'll still need my
>> patch series for other architectures.)
>
> How can I obtain a kernel address of the beginning of a given page
> (as represented by struct page) on x86_64 today?

I don't know off the top of my head. I've used virt_to_phys, but
things like PFN_PHYS(page_to_pfn(page)) maybe? I'm not entirely clear
which you need, but mm.h seems to have the bulk of what I've seen.

-Kees

-- 
Kees Cook
Chrome OS Security
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