Date: Tue, 22 Feb 2011 11:54:32 -0800
From: Kees Cook <kees.cook@canonical.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Greg KH <gregkh@suse.de>, David Daney <ddaney@caviumnetworks.com>,
        linux-kernel@vger.kernel.org, Eugene Teo <eugeneteo@kernel.sg>,
        Ralph Campbell <infinipath@qlogic.com>,
        Roland Dreier <roland@kernel.org>, Sean Hefty <sean.hefty@intel.com>,
        Hal Rosenstock <hal.rosenstock@gmail.com>,
        Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Miklos Szeredi <miklos@szeredi.hu>,
        "J. Bruce Fields" <bfields@fieldses.org>, Neil Brown <neilb@suse.de>,
        Matthew Wilcox <matthew@wil.cx>, James Morris <jmorris@namei.org>,
        Stephen Smalley <sds@tycho.nsa.gov>,
        Eric Paris <eparis@parisplace.org>, Nick Piggin <npiggin@kernel.dk>,
        Arnd Bergmann <arnd@arndb.de>, Ian Campbell <ian.campbell@citrix.com>,
        Jarkko Sakkinen <ext-jarkko.2.sakkinen@nokia.com>,
        Tejun Heo <tj@kernel.org>, Casey Schaufler <casey@schaufler-ca.com>
Subject: Re: [PATCH 2/2] debugfs: only allow root access to debugging
 interfaces
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On Tue, Feb 22, 2011 at 07:34:18PM +0000, Alan Cox wrote:
> Anyway - we don't mostly have a "root/non-root" model - it went out
> around Linux 1.2. So any model for dealing with should be respecting of
> capabilities, SELinux and the like.

That reminds me; in this line of reasoning, would a patchset to update all
the /proc/sys, /sys, etc writing functions to take capability lists and check
them be accepted? Because right now, almost everything in /proc/sys uses
DAC instead of checking caps. I think the same is true of /sys and debugfs.

-Kees

-- 
Kees Cook
Ubuntu Security Team
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