linux-kernel - Re: [PATCH v5 05/21] x86, boot: Calculate decompression size during boot not build

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Message-ID: <CAGXu5jJwiX2z7tYitmMCS-KdRy4+N9VvVc1-Lf+qZLijnxiFQQ@mail.gmail.com>
Date:	Fri, 15 Apr 2016 12:14:22 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Yinghai Lu <yinghai@...nel.org>, Baoquan He <bhe@...hat.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Matt Redfearn <matt.redfearn@...tec.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andy Lutomirski <luto@...nel.org>, lasse.collin@...aani.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Young <dyoung@...hat.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 05/21] x86, boot: Calculate decompression size during
 boot not build

On Fri, Apr 15, 2016 at 1:12 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Kees Cook <keescook@...omium.org> wrote:
>
>> From: Yinghai Lu <yinghai@...nel.org>
>>
>> Currently z_extract_offset is calculated in boot/compressed/mkpiggy.c.
>
> What is the high level meaning of z_extract_offset? I cannot tell without reading
> the code - and the point of changelogs is for them to be readable without having
> to read the code.

I'll clarify it in the changelog. (FWIW, it's the offset into the
extraction buffer where it's safe to put the data-to-be-extracted).

> The rest of the changelog is pretty good.

Thanks!

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security