linux-kernel - Re: [PATCH 2/2] ocfs2: ensure trusted xattrs are not returned to unprivileged users via listxattr

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Message-ID: <20100302231517.GA3910@us.ibm.com>
Date:	Tue, 2 Mar 2010 17:15:17 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	James Morris <jmorris@...ei.org>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Mark Fasheh <mfasheh@...e.com>, Alex Elder <aelder@....com>,
	Chris Mason <chris.mason@...cle.com>,
	a.gruenbacher@...puter.org
Subject: Re: [PATCH 2/2] ocfs2: ensure trusted xattrs are not returned to
 unprivileged users via listxattr

Quoting Joel Becker (Joel.Becker@...cle.com):
> On Tue, Mar 02, 2010 at 07:02:22PM +1100, James Morris wrote:
> > Ensure that trusted xattrs are not returned to unprivileged users
> > via listxattr, in keeping with several other implmentations, such
> > as ext3.
> > 
> > Signed-off-by: James Morris <jmorris@...ei.org>
> 
> If this is the standard expectation, why not lift it up into the vfs?

I wonder why xattr_permission() isn't called from vfs_listxattr()
in fs/xattr.c?  It sure looks like it was done on purpose...

> Acked-by: Joel Becker <joel.becker@...cle.com>
> 
> -- 
> 
> "The nearest approach to immortality on Earth is a government
>  bureau."
> 	- James F. Byrnes
> 
> Joel Becker
> Principal Software Developer
> Oracle
> E-mail: joel.becker@...cle.com
> Phone: (650) 506-8127
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