linux-kernel - Re: [REVIEW][PATCH 1/4] vfs: Don't allow overwriting mounts in the current mount namespace

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Date:	Sat, 9 Nov 2013 00:49:16 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Miklos Szeredi <miklos@...redi.hu>,
	Andy Lutomirski <luto@...capital.net>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthias Schniedermeyer <ms@...d.de>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [REVIEW][PATCH 1/4] vfs: Don't allow overwriting mounts in the
 current mount namespace

On Fri, Nov 08, 2013 at 02:17:31PM -0800, Eric W. Biederman wrote:
> > Read what you've written a few lines above.  The part about target->i_mutex
> > being held.
> 
> That works for the rename as unlink case but we don't hold
> old_dentry->d_inode->i_mutex which is what is needed to prevent a mount
> on the dentry we are renaming.

It will be held in 3.13.

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