linux-kernel - Re: VFS, NFS security bug? Should CAP_MKNOD and CAP_LINUX_IMMUTABLE be added to CAP_FS

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Message-ID: <20090312161047.GA15209@us.ibm.com>
Date:	Thu, 12 Mar 2009 11:10:47 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Igor Zhbanov <izh1979@...il.com>, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, neilb@...e.de, Trond.Myklebust@...app.com,
	David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: VFS, NFS security bug? Should CAP_MKNOD and
	CAP_LINUX_IMMUTABLE be added to CAP_FS_MASK?

Quoting J. Bruce Fields (bfields@...ldses.org):
> On Wed, Mar 11, 2009 at 03:53:34PM +0300, Igor Zhbanov wrote:
> > Hello!
> > 
> > It seems that CAP_MKNOD and CAP_LINUX_IMMUTABLE were forgotten to be
> > added to CAP_FS_MASK_B0 in linux-2.6.x and to CAP_FS_MASK in
> > linux-2.4.x. Both capabilities affects file system and can be
> > considered file system capabilities.
> 
> Sounds right to me--I'd expect rootsquash to guarantee that new device
> nodes can't be created from the network.  Cc'ing random people from the
> git log for include/linux/capability.h in hopes they can help.

Yeah it seems reasonable.  If it is, then does that mean that we
also need CAP_SYS_ADMIN (to write selinux labels) and CAP_SETFCAP
(to set file capabilities) as well?

-serge
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