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

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Message-ID: <20150302145313.GC17532@pd.tnic>
Date:	Mon, 2 Mar 2015 15:53:13 +0100
From:	Borislav Petkov <bp@...e.de>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, 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 Mon, Mar 02, 2015 at 03:04:30AM -0800, Yinghai Lu wrote:
> We can not assume that range is safe to use.
> 
> Please check attach one that should fix the problem really.

Well, it seems to work here but it still doesn't look reliable enough to
me. And this addon_zo thing of arbitrary 256K is strange.

What we should do instead and IMHO is have a special setup_data section
located right above .text where struct setup_data things are put in so
that they never get overwritten. This should be the cleanest IMHO.

It is hpa's call in the end of the day anyway.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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