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

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Message-Id: <1204243584.2715.26.camel@moss-terrapins.epoch.ncsc.mil>
Date:	Thu, 28 Feb 2008 19:06:24 -0500
From:	Dave Quigley <dpquigl@...ho.nsa.gov>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	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, 2008-02-28 at 19:23 -0500, Christoph Hellwig wrote:
> On Thu, Feb 28, 2008 at 06:44:43PM -0500, Dave Quigley wrote:
> > The main reason for this was the way that NFS passes information it
> > receives around. If you look in patch 11 you will see that
> > nfsd4_decode_fattr doesn't give us access to an inode to use for
> > security_inode_setsecurity and it doesn't give us a dentry to use the
> > xattr helpers with. The only thing we get here is an iattr structure
> > which is then passed back up to fill in the inode fields. Also without
> > functionality provided by patch 1 we don't even know where to put the
> > security blob we are getting from the wire. 
> 
> Take a look at how ACLs are handled.  They're passed up from the _decode
> operations into a small structure that is referenced by struct
> nfsd4_<operation> and pass it up until the level where the dentry
> is available.
> 

Thanks for the heads up on this. This is partially the reason I wanted
to post the set for feedback. If it pans out this will probably be a
much cleaner method that doesn't muck around with VFS internals.

> > 
> > > 
> > > > +#define DN_LABEL        0x00000040      /* File (re)labeled */
> > > 
> > > An any inotify/dnotify additions should be separate from the vfs to
> > > filesystem interface.  Please make it a separate patch and describe
> > > properly why it's needed in it's description.
> > 
> > Will do. We added them to conform to the functionality provided for
> > other elements in the iattr structure. We will add a more robust
> > explanation in the patch.
> > 
> > > 
> > > > index df6b95d..1169963 100644
> > > > --- a/include/linux/xattr.h
> > > > +++ b/include/linux/xattr.h
> > > > @@ -50,6 +50,7 @@ ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
> > > >  ssize_t vfs_getxattr(struct dentry *, char *, void *, size_t);
> > > >  ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
> > > >  int vfs_setxattr(struct dentry *, char *, void *, size_t, int);
> > > > +int vfs_setxattr_locked(struct dentry *, char *, void *, size_t, int);
> > > >  int vfs_removexattr(struct dentry *, char *);
> > > >  
> > > >  ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
> > > > -- 
> > > > 1.5.3.8
> > > > 
> > > > -
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