linux-kernel - Re: [GIT PULL] user namespace and namespace infrastructure changes for 3.8

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Message-ID: <CALCETrXagfjy4o0_JCZpMfdocYK-MpOp3eH-tPZhgazvJAy-EQ@mail.gmail.com>
Date:	Thu, 13 Dec 2012 21:34:22 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] user namespace and namespace infrastructure changes
 for 3.8

On Thu, Dec 13, 2012 at 8:11 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Andy Lutomirski <luto@...capital.net> writes:
>
>> One more issue: the requirement that both upper and lower uids (etc.)
>> in the maps are in order is rather limiting.  I have no objection if
>> you only require upper ids to be monotonic, but currently there's no
>> way to may root outside to uid n (for n > 0) and some nonroot user
>> outside to uid 0.
>
> There is.  You may set up to 5 (extents).  You just have to use a second
> extent for the non-contiguous bits.  My reader is lazy and you have to
> set all of the extents with a single write, so you may have missed the
> ability to set more than one extent.
>

If I'm wrong, I'll happily eat my words.  Both:

0 1 1
1 0 1

and

1 0 1
0 1 1

are rejected, unless I totally messed up.

--Andy
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