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

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Date:	Wed, 10 Sep 2014 23:27:16 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Kees Cook <keescook@...omium.org>,
	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 11:05am, Vivek Goyal wrote:
> On Wed, Sep 10, 2014 at 07:41:38AM -0700, 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
> > 
> 
> Bao,
> 
> Can you please test Kees's patch and provide feedback.

I can only use a trick by setting the E820_MAX to a very small number,
say 10 in kexec-tools. Then extra memory regions will be added into
setup data. Sufficient real test can't be taken by me since lack of
machine.

Chao said someone has this kind of machine and help him test his
kexec-tools patches, I will ask him for help to test Kees's patch.

> 
> Thanks
> Vivek
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