linux-kernel - Re: [PATCH v7 00/16] EVM

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Message-ID: <20110718134503.GC8127@mail.hallyn.com>
Date:	Mon, 18 Jul 2011 08:45:03 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	David Safford <safford@...son.ibm.com>
Cc:	Kyle Moffett <kyle@...fetthome.net>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Dmitry Kasatkin <dmitry.s.kasatkin@...il.com>
Subject: Re: [PATCH v7 00/16] EVM

Quoting David Safford (safford@...son.ibm.com):
> On Wed, 2011-06-29 at 21:57 -0400, Kyle Moffett wrote:
> > There have been numerous cases in the past where a corrupt or invalid
> > filesystem causes kernel panics or even exploitable overflows or memory
> > corruption; see the history of the "fsfuzzer" tool for more information.
> 
> Seems to me code bugs in the kernel should be fixed, given the universal 
> practice of automounting of removable media, and loopback mounting 
> images, regardless of EVM.

Hi David,

yeah, this would also be nice for making people feel cozier about
supporting unprivileged fs mounts in general.  I wonder if a real
project around the idea of strengthening the robustness of the fs
code, starting with the superblock parsing for a few of the most
comment filesystems, could take off.  A combination of

  . code auditing and test (i.e. fsfuzzer)
  . moving parts of the code to unprivileged userspace
  . marking audited filesystems as unprivileged-mountable, in the
    way Miklos' patchset a few years ago did
  . so that those who want to can refuse auto-mount of any not
    audited filesystems.

-serge
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