Message-ID: <4D641446.1080400@caviumnetworks.com>
Date: Tue, 22 Feb 2011 11:53:42 -0800
From: David Daney <ddaney@caviumnetworks.com>
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To: Kees Cook <kees.cook@canonical.com>
CC: Alan Cox <alan@lxorguk.ukuu.org.uk>, Greg KH <gregkh@suse.de>,
        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
References: <1298398198-18482-1-git-send-email-kees.cook@canonical.com> <1298398198-18482-2-git-send-email-kees.cook@canonical.com> <20110222181613.GU4000@outflux.net> <4D640133.9020901@caviumnetworks.com> <20110222184726.GV4000@outflux.net> <20110222191454.GB9991@suse.de> <20110222192532.GY4000@outflux.net> <20110222193418.773ccd4b@lxorguk.ukuu.org.uk> <20110222195018.GA4000@outflux.net>
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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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