From: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
To: "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
Cc: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: Constraining the memory used by an unprivilged mount of tmpfs.
Date: Fri, 18 Jan 2013 10:42:15 -0800 [thread overview]
Message-ID: <50F99787.3090708@parallels.com> (raw)
In-Reply-To: <87ip6vug8p.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
On 01/17/2013 11:01 PM, Eric W. Biederman wrote:
> What are the practical problems with control groups that makes them
> undesirable/hard to use with namespaces?
>
> What would it take to fix the problems with control groups?
There aren't, from my PoV.
When I run containers, for instance, I basically join all namespaces,
configure all groups, and everything I can.
I do know, however, that not every use case is like that, and those
things tends to be very loosely coupled.
So what I am worried about, is not a valid container usage where you
have your constraints configured. But if I login into a box as a normal
user, and that now allows me to create a userns, and maliciously fire a
big tmpfs from there, cgroups will not gonna be there for me - it's not
a container box, is just something I am trying to break.
next prev parent reply other threads:[~2013-01-18 18:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-16 10:25 [PATCH RESEND] userns: enable tmpfs support for user namespace Gao feng
[not found] ` <1358331945-4106-1-git-send-email-gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2013-01-16 14:35 ` Serge Hallyn
2013-01-17 1:07 ` Gao feng
[not found] ` <50F74EC6.60004-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2013-01-17 10:15 ` Eric W. Biederman
2013-01-17 17:14 ` Serge Hallyn
2013-01-17 23:34 ` Eric W. Biederman
[not found] ` <87fw1zbd03.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-01-18 4:24 ` Serge Hallyn
2013-01-18 5:29 ` Eric W. Biederman
[not found] ` <87vcavys6k.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-01-18 5:33 ` Glauber Costa
[not found] ` <50F8DEBF.1020701-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-01-18 6:04 ` Eric W. Biederman
[not found] ` <87ip6vyqkf.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-01-18 6:10 ` Glauber Costa
[not found] ` <50F8E73B.7000903-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-01-18 7:01 ` Constraining the memory used by an unprivilged mount of tmpfs Eric W. Biederman
[not found] ` <87ip6vug8p.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-01-18 18:42 ` Glauber Costa [this message]
[not found] ` <50F99787.3090708-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-01-18 19:48 ` Serge Hallyn
2013-01-18 19:52 ` Glauber Costa
[not found] ` <50F9A7FD.6030507-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-01-18 20:06 ` Serge Hallyn
2013-01-18 20:18 ` Eric W. Biederman
[not found] ` <87hament1w.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-01-18 20:32 ` Serge Hallyn
2013-01-18 22:38 ` Glauber Costa
[not found] ` <50F9CED4.2070109-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-01-25 8:12 ` Eric W. Biederman
[not found] ` <87zjzxllzz.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-01-25 8:21 ` Lord Glauber Costa of Sealand
2013-01-20 19:27 ` Serge E. Hallyn
2013-01-21 2:39 ` [PATCH RESEND] userns: enable tmpfs support for user namespace Gao feng
[not found] ` <50FCAA62.8070804-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2013-01-21 5:08 ` Glauber Costa
2013-01-20 19:24 ` Serge E. Hallyn
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