linux-kernel - Re: [PATCH 03/11] VFS: Add security label support to *notify

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Message-ID: <20080228211531.GE32351@josefsipek.net>
Date:	Thu, 28 Feb 2008 16:15:31 -0500
From:	"Josef 'Jeff' Sipek" <jeffpc@...efsipek.net>
To:	Dave Quigley <dpquigl@...ho.nsa.gov>
Cc:	hch@...radead.org, viro@....linux.org.uk,
	trond.myklebust@....uio.no, bfields@...ldses.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 03/11] VFS: Add security label support to *notify

On Thu, Feb 28, 2008 at 03:39:30PM -0500, Dave Quigley wrote:
...
> > Alright...so, few things...
> > 
> > 1) why do you need the locked/unlocked versions?
> > 
> > 2) instead of passing a flag to a common function, why not have:
> > 
> > vfs_setxattr_locked(....)
> > {
> > 	// original code minus the lock/unlock calls
> > }
> > 
> > vfs_setxattr(....)
> > {
> > 	mutex_lock(...);
> > 	vfs_setxattr_locked(...);
> > 	mutex_unlock(...);
> > }
> 
> What we do and what you propose aren't logically equivalent. There is a
> permission check inside vfs_setxattr before the mutex lock.

Ah, right. I didn't notice the @@ line...

Josef 'Jeff' Sipek.

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