linux-kernel - Re: [patch 06/15] sysfs: dont call notify

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Message-ID: <20080506064817.GB6062@suse.de>
Date:	Mon, 5 May 2008 23:48:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, hch@...radead.org,
	viro@...IV.linux.org.uk, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [patch 06/15] sysfs: dont call notify_change

On Tue, May 06, 2008 at 08:28:39AM +0200, Miklos Szeredi wrote:
> > > sysfs_chmod_file() calls notify_change() to change the permission bits
> > > on a sysfs file.  Replace with explicit call to sysfs_setattr() and
> > > fsnotify_change().
> > > 
> > > This is equivalent, except that security_inode_setattr() is not
> > > called.  This function is called by drivers, so the security checks do
> > > not make any sense.
> > 
> > Are you sure?  As a user, you can chmod the sysfs file and it will
> > stick,
> 
> Right, but that's not sysfs_chmod_file() but sys_chmod(), which calls
> notify_change(), which calls security_inode_setattr().
> 
> sysfs_chmod_file() is just called by a couple of drivers to change the
> file mode during operation, it's never called by user action directly.

Ah, sorry, you are correct, no objection from me for this patch:
	Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

thanks,

greg k-h
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