linux-kernel - Re: Hardening debugfs (Was Re: [PATCH] debugfs: more tightly restrict default mount mode)

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Message-ID: <1346165758.15747.7.camel@deadeye.wl.decadent.org.uk>
Date:	Tue, 28 Aug 2012 07:55:58 -0700
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Landley <rob@...dley.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ludwig Nussel <ludwig.nussel@...e.de>,
	Alessandro Rubini <rubini@...dd.com>, linux-doc@...r.kernel.org
Subject: Re: Hardening debugfs (Was Re: [PATCH] debugfs: more tightly
 restrict default mount mode)

On Tue, 2012-08-28 at 10:41 -0400, Theodore Ts'o wrote:
> On Mon, Aug 27, 2012 at 01:32:15PM -0700, Kees Cook wrote:
> > Since the debugfs is mostly only used by root, make the default mount
> > mode 0700. Most system owners do not need a more permissive value,
> > but they can choose to weaken the restrictions via their fstab.
> > 
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> I agree with this patch, but it would also be good if we could try to
> harden debugfs in general.  Some ideas that might be worth discussing,
> for example?
[...]

The problems are apparently larger than specific modules:
http://lists.linux-foundation.org/pipermail/ksummit-2012-discuss/2012-July/000894.html

Ben.

-- 
Ben Hutchings
It is a miracle that curiosity survives formal education. - Albert Einstein

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