linux-kernel - Re: [PATCH v4] x86, boot: Make data from decompress

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Message-ID: <20150316074543.GA15772@gmail.com>
Date:	Mon, 16 Mar 2015 08:45:43 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Borislav Petkov <bp@...e.de>, Baoquan He <bhe@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v4] x86, boot: Make data from decompress_kernel stage
 live longer


* Yinghai Lu <yinghai@...nel.org> wrote:

> After commit f47233c2d34f ("x86/mm/ASLR: Propagate base load address 
> calculation"), get warning about setup_data from debugfs for 
> setup_data. Boris found setup_data for kaslr from boot stage become 
> all 0's in kernel stage.

And? What is the high level effect to the user?

'setup_data for kaslr from boot stage becomes all 0's' is not a high 
level effect. It's a detail of the mechanism of the bug, not a high 
level effect.

Think of a regular Linux user reading your changelogs. The first 
paragraph of bug fixes should be readable to them!

_That_ is what 'high level' means.

Thanks,

	Ingo
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