linux-kernel - Re: [RFC][PATCH] Fix cap_capable to only allow owners in the parent user namespace to have caps.

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Message-ID: <CA+55aFwXnFEFXbkwFPq9xt30xp2_6jfpBLd3E2bms79KKK=V1Q@mail.gmail.com>
Date:	Thu, 13 Dec 2012 14:43:36 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	containers@...ts.linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	LSM List <linux-security-module@...r.kernel.org>
Subject: Re: [RFC][PATCH] Fix cap_capable to only allow owners in the parent
 user namespace to have caps.

On Thu, Dec 13, 2012 at 2:39 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>
> Andy Lutomirski pointed out that the current behavior of allowing the
> owner of a user namespace to have all caps when that owner is not in a
> parent user namespace is wrong.
>
> This is a bug introduced by the kuid conversion which made it possible
> for the owner of a user namespace to live in a child user namespace.  I
> goofed and totally missed this implication.

Hmm. Shouldn't this be cc: stable if it was introduced in the kuid
conversion? Or is it only an issue with your new namespace tree (which
I haven't pulled yet)?

              Linus
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