linux-kernel - Re: [PATCH v2 0/2] kallsyms: handle special absolute symbols

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Message-Id: <20140310130224.70ec6a1940ec636bfb89f6bb@linux-foundation.org>
Date:	Mon, 10 Mar 2014 13:02:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Honig <ahonig@...gle.com>,
	Michal Marek <mmarek@...e.cz>,
	"x86@...nel.org" <x86@...nel.org>, Tejun Heo <tj@...nel.org>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] kallsyms: handle special absolute symbols

On Mon, 10 Mar 2014 12:58:06 -0700 Kees Cook <keescook@...omium.org> wrote:

> On Mon, Mar 10, 2014 at 12:06 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Fri,  7 Mar 2014 17:00:23 -0800 Kees Cook <keescook@...omium.org> wrote:
> >> Handles 0-based per_cpu variables as being absolute so they are
> >> not relocated under kASLR on x86_64.
> >
> > Would it be prudent to revert 0f55159d091cb1e5 ("kallsyms: fix absolute
> > addresses for kASLR") then sort all this out for 3.15?
> 
> My opinion is that if it breaks a real-life case (avr32), it should be
> reverted.

We aren't going to be able to test this on 40 architectures so yes,
let's take the cautious approach.

> The only people affected by the kallsyms per_cpu relocation
> reporting bug are those using kASLR on x86, and even then the bug is a
> corner case on live kernel debugging.
> 
> I am fine either way.

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