linux-kernel - Re: [RFC v1 00/14] Bus1 Kernel Message Bus

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Message-ID: <20161027004524.GA4184@node>
Date:   Thu, 27 Oct 2016 03:45:24 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     David Herrmann <dh.herrmann@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, Greg KH <greg@...ah.com>,
        Hannes Reinecke <hare@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Arnd Bergmann <arnd@...db.de>, Tom Gundersen <teg@...m.no>,
        Josh Triplett <josh@...htriplett.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC v1 00/14] Bus1 Kernel Message Bus

On Wed, Oct 26, 2016 at 10:34:30PM +0200, David Herrmann wrote:
> Long story short: We have uid<->uid quotas so far, which prevent DoS
> attacks, unless you get access to a ridiculous amount of local UIDs.
> Details on which resources are accounted can be found in the wiki [1].

Does only root user_ns uid count as separate or per-ns too?

In first case we will have vitually unbounded access to UIDs.

The second case can cap number of user namespaces a user can create while
using bus1 inside.

Or am I missing something?

-- 
 Kirill A. Shutemov