linux-kernel - Re: [PATCH] userns/capability: Add user namespace capability

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Message-ID: <5624E684.8000302@nod.at>
Date:	Mon, 19 Oct 2015 14:48:04 +0200
From:	Richard Weinberger <richard@....at>
To:	Yves-Alexis Perez <corsac@...ian.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Tobias Markus <tobias@...lix.eu>
Cc:	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Christoph Lameter <cl@...ux.com>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	linux-security-module@...r.kernel.org, linux-api@...r.kernel.org,
	linux-man@...r.kernel.org,
	Richard Weinberger <richard.weinberger@...il.com>
Subject: Re: [PATCH] userns/capability: Add user namespace capability

Am 19.10.2015 um 14:36 schrieb Yves-Alexis Perez:
> On dim., 2015-10-18 at 20:41 -0500, Serge E. Hallyn wrote:
>> We shouldn't need a long-term solution.  Your concern is bugs.  After
>> some time surely we'll feel that we have achieved a stable solution?
> 
> But this is actually the whole point: we need a long term solution, because
> they will always be bug, whether in user namespaces or in others parts exposed
> by user namespaces. It's fine to fix them when we find them, but that still
> means they're exploitable even before we know about them. We still find bugs
> in code written years ago, it's quite certain there are bugs in current code.

You can replace the term "user namespace" with any other non-trivial kernel subsystem.
There will always be bugs.

Thanks,
//richard
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