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

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Message-ID: <20150301152351.GA17391@gmail.com>
Date:	Sun, 1 Mar 2015 16:23:51 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...e.de>, Jiri Kosina <jkosina@...e.cz>,
	Kees Cook <keescook@...omium.org>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>,
	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


(Cc:-ed Jiri and Kees as well.)

* Borislav Petkov <bp@...e.de> wrote:

> On Sat, Feb 28, 2015 at 06:40:39PM -0800, Yinghai Lu wrote:
> >
> > oh, no. the offending commit already got into linus tree.
> 
> We're working on it, follow this thread:
> 
> http://lkml.kernel.org/r/1424929021.10337.24.camel@intel.com

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.

So I'm inclined to apply Yinghai's fix, with a better changelog that 
explains what happened ...

Agreed?

Thanks,

	Ingo
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