linux-kernel - Re: [PATCH 1/4] kaslr: check user's config too when handle relocations

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Message-ID: <20140911093130.GC4411@dhcp-16-116.nay.redhat.com>
Date:	Thu, 11 Sep 2014 17:31:30 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Vivek Goyal <vgoyal@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Deutschmann <whissi@...ssi.de>,
	Dave Young <dyoung@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	WANG Chao <chaowang@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/4] kaslr: check user's config too when handle
 relocations

On 09/10/14 at 07:41am, Kees Cook wrote:
> On Wed, Sep 10, 2014 at 7:30 AM, Vivek Goyal <vgoyal@...hat.com> wrote:
> > So I would suggest that test and repost the other patch with proper changelog
> > and that might be sufficient for now. Only other thing we will need is
> > Kees's patch for avoiding setup data regions in kaslr.
> 
> If someone can confirm that my patch works, I can request x86 pull it.
> 
> Currently living here:
> https://git.kernel.org/cgit/linux/kernel/git/kees/linux.git/log/?h=kaslr

Hi Kees,

I tested your patch, it works. The way is like below:

I changed kexec-tools to make all add_buffer doing from down to top.
Then all stuff including kernel, initrd, setupda, cmdline, realmode_data
all are put inside 0~1G. And set E820_MAX to 10, since on my pc there are 17
memoery regions, then 7 memory regions are added into setup_data as a
blob. Then copy arch/x86/boot/printf.c to arch/x86/boot/compressed/ and
make it work. From printing message, the setup data is checking each
time when a memory slot is added.

> 
> Thanks!
> 
> -Kees
> 
> -- 
> Kees Cook
> Chrome OS Security
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