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

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Message-ID: <20120828150215.GB23035@thunk.org>
Date:	Tue, 28 Aug 2012 11:02:15 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Ben Hutchings <ben@...adent.org.uk>
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, Aug 28, 2012 at 07:55:58AM -0700, Ben Hutchings wrote:
> 
> The problems are apparently larger than specific modules:
> http://lists.linux-foundation.org/pipermail/ksummit-2012-discuss/2012-July/000894.html
> 

Sure, but most of those problems require root access, or physical
access to the hardware.  And a number of the "can oops the kernel"
assume module disappears out from under the open file descriptor, so
(a) that's a problem that can be fixed, and (b) if we can suppress a
random device driver from having its debugfs directory appear by
default, it certainly helps things.

					- Ted
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