linux-kernel - Re: [PATCH] use %pK for /proc/kallsyms and /proc/modules

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Message-Id: <20110126164650.ef5bd302.akpm@linux-foundation.org>
Date:	Wed, 26 Jan 2011 16:46:50 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>, Marcus Meissner <meissner@...e.de>,
	Jason Wessel <jason.wessel@...driver.com>,
	Eugene Teo <eugeneteo@...nel.org>,
	Joe Perches <joe@...ches.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Len Brown <len.brown@...el.com>,
	Changli Gao <xiaosuo@...il.com>,
	Dan Rosenberg <drosenberg@...curity.com>
Subject: Re: [PATCH] use %pK for /proc/kallsyms and /proc/modules

On Wed, 26 Jan 2011 16:29:36 -0800
Kees Cook <kees.cook@...onical.com> wrote:

> > > Note that this changes %x to %p, so some legitimately 0 values in
> > > /proc/kallsyms would have changed from 00000000 to "(null)". To avoid
> > > this, "(null)" is not used when using the "K" format. Anything parsing
> > > such addresses should have no problem with this change. (Thanks to Joe
> > > Perches for the suggestion.)
> > 
> > OK, so what applications did this patch just break?
> 
> I'm not aware of any breakage as a result of this yet.

There will be some - there always are :( But users will only see
problems if they've set kptr_restrict.

Which they shall do.  How come we defaulted kptr_restrict to "true"?
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