linux-kernel - Re: [PATCH 2/2] debugfs: only allow root access to debugging interfaces

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Message-ID: <4D641446.1080400@caviumnetworks.com>
Date:	Tue, 22 Feb 2011 11:53:42 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	Kees Cook <kees.cook@...onical.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, Eugene Teo <eugeneteo@...nel.sg>,
	Ralph Campbell <infinipath@...gic.com>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Miklos Szeredi <miklos@...redi.hu>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>, Matthew Wilcox <matthew@....cx>,
	James Morris <jmorris@...ei.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Eric Paris <eparis@...isplace.org>,
	Nick Piggin <npiggin@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
	Ian Campbell <ian.campbell@...rix.com>,
	Jarkko Sakkinen <ext-jarkko.2.sakkinen@...ia.com>,
	Tejun Heo <tj@...nel.org>,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH 2/2] debugfs: only allow root access to debugging interfaces

On 02/22/2011 11:50 AM, Kees Cook wrote:
> On Tue, Feb 22, 2011 at 07:34:18PM +0000, Alan Cox wrote:
[...]
>
>> Or of course you could just chmod it 0700 in the distro !
>
> I'm trying to, but that involves a race condition since I can't control it
> during the mount (nor set the default mode like I was trying to with the
> patchset). tmpfs allows "mode=", but debugfs does not...
>

Someone skilled in the black arts of kernel programming might be able to 
add 'mode=' support to debugfs.

David Daney
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