linux-kernel - Re: unprivileged mounts vs. rmdir (was: VFS, NFS security bug? ...)

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Message-ID: <20090326131425.GB8014@parisc-linux.org>
Date:	Thu, 26 Mar 2009 07:14:25 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Pavel Machek <pavel@....cz>
Cc:	Miklos Szeredi <miklos@...redi.hu>, serue@...ibm.com,
	bfields@...ldses.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, ebiederm@...ssion.com,
	linux-fsdevel@...r.kernel.org
Subject: Re: unprivileged mounts vs. rmdir (was: VFS, NFS security bug? ...)

On Thu, Mar 26, 2009 at 01:43:38PM +0100, Pavel Machek wrote:
> Well... traditionally if you have an open file or cwd inside mounted
> tree... that blocks unmount, right?
> 
> What will you do with processes that have open (deleted) files inside
> the mount? What about cwd?

umount -l ?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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