linux-kernel - Re: [NFS] [PATCH 0/4] add killattr inode operation to allow filesystems to interpret ATTR_KILL

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Date:	Tue, 28 Aug 2007 20:52:58 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jeff Layton <jlayton@...hat.com>,
	linux-fsdevel@...r.kernel.org, nfs@...ts.sourceforge.net,
	linux-cifs-client@...ts.samba.org, linux-kernel@...r.kernel.org
Subject: Re: [NFS] [PATCH 0/4] add killattr inode operation to allow filesystems to interpret ATTR_KILL_S*ID bits

On Tue, Aug 28, 2007 at 03:49:51PM -0400, Trond Myklebust wrote:
> Hmm... There has to be an implicit promise here that nobody else will
> ever try to set ATTR_KILL_SUID/ATTR_KILL_SGID and ATTR_MODE at the same
> time. Currently, that assumption is not there:
> 
> 
> > 	if (ia_valid & ATTR_KILL_SGID) {
> > 		attr->ia_valid &= ~ ATTR_KILL_SGID;
> > 		if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
> > 			if (!(ia_valid & ATTR_MODE)) {
> > 				ia_valid = attr->ia_valid |= ATTR_MODE;
> > 				attr->ia_mode = inode->i_mode;
> > 			}
> > 			attr->ia_mode &= ~S_ISGID;
> > 		}
> > 	}
> 
> Should we perhaps just convert the above 'if (!(ia_valid & ATTR_MODE))'
> into a 'BUG_ON(ia_valid & ATTR_MODE)'?

Yes, sounds fine to me.
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