linux-kernel - Re: [PATCH] x86: kaslr: move ELF relocation handling to C

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Message-ID: <20130422080419.GB7080@gmail.com>
Date:	Mon, 22 Apr 2013 10:04:19 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Jiri Kosina <jkosina@...e.cz>, Olaf Hering <olaf@...fle.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Gokul Caushik <caushik1@...il.com>,
	Josh Triplett <josh@...htriplett.org>,
	Joe Millenbach <jmillenbach@...il.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jacob Shin <jacob.shin@....com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Northup <digitaleric@...gle.com>,
	Dan Rosenberg <drosenberg@...curity.com>,
	Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>
Subject: Re: [PATCH] x86: kaslr: move ELF relocation handling to C


* Kees Cook <keescook@...omium.org> wrote:

> On Sun, Apr 21, 2013 at 2:13 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > * Kees Cook <keescook@...omium.org> wrote:
> >
> >> Moves the relocation handling into C, after decompression. Only
> >> kernels that need relocation support will use the code. The new
> >> CONFIG_RANDOMIZE_BASE does not yet do anything except turn on this logic
> >> for 64-bit kernels.
> >
> > So why not keep the inactive CONFIG_RANDOMIZE_BASE hunks in a separate
> > patch, and just have this one clean, orthogonal patch that moves
> > relocation handling into C?
> 
> I had wanted there to be a way to test building with 64-bit
> relocations. With this patch and CONFIG_RANDOMIZE_BASE=y, I could do
> that. Would you rather I remove those pieces?

But AFAICS CONFIG_RANDOMIZE_BASE is not an interactive config option, so 
how did you turn it on?

But no strong objections in any case.

Thanks,

	Ingo
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