linux-kernel - Re: [PATCH v2 04/15] x86, kaslr: get kaslr

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Message-ID: <CAE9FiQWVdzX=eDGEz3u906TYTagps0VZsSWKHRqJro8wfgGjeg@mail.gmail.com>
Date:	Sat, 7 Mar 2015 13:11:04 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...e.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	Baoquan He <bhe@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2 04/15] x86, kaslr: get kaslr_enabled back correctly

On Sat, Mar 7, 2015 at 1:05 PM, Borislav Petkov <bp@...e.de> wrote:
> On Fri, Mar 06, 2015 at 11:53:22AM -0800, Yinghai Lu wrote:
> ---
> Commit
>
>   f47233c2d34f ("x86/mm/ASLR: Propagate base load address calculation")
>
> started passing KASLR status to kernel proper, but it uses a physical
> address as the vaule, leading to parsing bogus KASLR status in kernel
> proper.
>
> The setup_data linked list and thus the element which contains
> kaslr_enabled is chained together using physical addresses. At the time
> when we access it in the kernel proper, we're already running with
> paging enabled and therefore must access it through its virtual address.
>
> This patch changes the code to use early_memmap() and access the value.
> ---

Good to me.
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