linux-kernel - Re: [PATCH 1/8] x86, kaslr: get kaslr

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Message-ID: <CAE9FiQV7DouV+76mzH0jFjFJOFBm-ZmgKpYVjTGAmKao0y3HbA@mail.gmail.com>
Date:	Sun, 1 Mar 2015 11:27:48 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Borislav Petkov <bp@...e.de>, Jiri Kosina <jkosina@...e.cz>,
	Kees Cook <keescook@...omium.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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>
Subject: Re: [PATCH 1/8] x86, kaslr: get kaslr_enabled back correctly

On Sun, Mar 1, 2015 at 7:23 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> I think that's a different bug.
>
> parse_kaslr_setup() is simply bogus, it does:
>
>         kaslr_enabled = (bool)(pa_data + sizeof(struct setup_data));
>
> which makes no sense whatsoever: it randomly enables (or disables,
> depending on the physical address of the setup page) KASLR when it
> meets a SETUP_KASLR record.
>

Yes, you are right.

there are 8 patches in this series.
  x86, kaslr: get kaslr_enabled back correctly
  x86: Kill E820_RESERVED_KERN
  x86, efi: copy SETUP_EFI data and access directly
  x86, of: let add_dtb reserve by itself
  x86, boot: Add add_pci handler for SETUP_PCI
  x86: kill not used setup_data handling code
  x86, pci: convert SETUP_PCI data to list
  x86, pci: export SETUP_PCI data via sysfs

other 7 should also address the problem in
   http://lkml.kernel.org/r/1424929021.10337.24.camel@intel.com

the root cause is E820_RESERVED_KERN and setup_data handling
will make E820 are not page aligned anymore.

We should change setup_data handling.

Please check updated version at

git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
for-x86-4.0

(with a fix for config without CONFIG_PCI).

Thanks

Yinghai
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