linux-kernel - Re: ioctl CAP_LINUX_IMMUTABLE is checked in the wrong namespace

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Message-ID: <20140430003236.GA6472@thunk.org>
Date:	Tue, 29 Apr 2014 20:32:36 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Serge Hallyn <serge.hallyn@...ntu.com>
Cc:	Andy Lutomirski <luto@...capital.net>, Marian Marinov <mm@...com>,
	containers@...ts.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lxc-devel <lxc-devel@...ts.sourceforge.net>
Subject: Re: ioctl CAP_LINUX_IMMUTABLE is checked in the wrong namespace

On Wed, Apr 30, 2014 at 12:16:41AM +0000, Serge Hallyn wrote:
> I forget the details, but there was another case where I wanted to
> have the userns which 'owns' the whole fs available.  I guess we'd
> have to check against that instead of using inode_capable.

Yes, that sounds right.

And *please* tell me that that under no circumstances can anyone other
than root@...t_user_ns is allowed to use mknod....

						- Ted
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