linux-kernel - Re: [PATCH 0/4] user namespace fixes

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Message-ID: <CALCETrX2Fa-DuM+wkgsij7oiJXzCD8W6Phkv-MjgCDg_Ma6CTg@mail.gmail.com>
Date:	Mon, 17 Dec 2012 11:03:10 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, "Serge E. Hallyn" <serge@...lyn.com>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 0/4] user namespace fixes

On Fri, Dec 14, 2012 at 2:01 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> These are fixes from Andys review of my user namespace tree.
>
> The first two patches are critical must fix fixes.
>
> The third patch fixing commit_creds is a nice to have but fixing it
> would be good.
>
> Andy, Serge  if you could give these patches a once over to make certain
> I am not doing something stupid.
>
> Thank you,
> Eric
>
> ---
>
> Eric W. Biederman (4):
>       Fix cap_capable to only allow owners in the parent user namespace to have caps.

For whatever reason, I didn't get the actual email.  Assuming this is
5e4a08476b50fa39210fca82e03325cc46b9c235:

Acked-by: Andy Lutomirski <luto@...capital.net>

However, this comment:
                /*
                 * The owner of the user namespace in the parent of the
                 * user namespace has all caps.
                 */
could use work.  I agree with the code, but I gave up on understanding
the comment.

>       userns:  Require CAP_SYS_ADMIN for most uses of setns.
>       userns: Add a more complete capability subset test to commit_creds
>       userns: Fix typo in description of the limitation of userns_install
>

--Andy
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