linux-kernel - Re: [patch 07/24] fat: dont call notify

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Date:	Fri, 9 May 2008 09:45:02 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Christoph Hellwig <hch@...radead.org>
cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	viro@...IV.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	sds@...ho.nsa.gov, casey@...aufler-ca.com
Subject: Re: [patch 07/24] fat: dont call notify_change

On Thu, 8 May 2008, Christoph Hellwig wrote:

> On Tue, May 06, 2008 at 11:13:34AM +0200, Miklos Szeredi wrote:
> > From: Miklos Szeredi <mszeredi@...e.cz>
> > 
> > The FAT_IOCTL_SET_ATTRIBUTES ioctl() calls notify_change() to change
> > the file mode before changing the inode attributes.  Replace with
> > explicit call to fat_setattr().
> > 
> > This is equivalent, except that security_inode_setattr() is not called
> > before fat_setattr().  I think this is not needed, since the mode
> > change is just a side effect of the attribute change.
> 
> Actually I think we want the security_inode_setattr.  This is an
> implicit chmode when switching the ATTR_RO flag on and off and we should
> have the full security check for it.  Then again I'm not sure the
> security modules care about this level of detail because there's
> probably even worse ioctl hidden somewhere.
> 
> Ccing the Selinux guys and Casey in case they care.
> 

I don't know of any situation where we'd have policy differentating the 
ioctl check from setattr for FAT (or any filesystem).


- James
-- 
James Morris
<jmorris@...ei.org>
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