Date: Sat, 3 Nov 2007 13:01:54 -0700
From: sukadev@us.ibm.com
To: Pavel Emelyanov <xemul@openvz.org>
Cc: Ulrich Drepper <drepper@redhat.com>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       linux-kernel@vger.kernel.org, Serge Hallyn <serue@us.ibm.com>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Oleg Nesterov <oleg@tv-sign.ru>
Subject: Re: [patch] PID namespace design bug, workaround
Message-ID: <20071103200154.GA23234@us.ibm.com>
References: <20071101144307.GA29566@elte.hu> <4729E7E4.8070208@openvz.org> <4729E936.4040400@redhat.com> <4729EB3C.9050102@openvz.org> <472A6D91.1020300@redhat.com> <472AD7D6.80900@openvz.org> <20071102010419.23f3db5c.akpm@linux-foundation.org> <472ADC78.6070706@openvz.org> <472B2EBD.7070007@redhat.com> <472B327E.2060006@openvz.org>
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Pavel Emelianov [xemul@openvz.org] wrote:
| Ulrich Drepper wrote:
| > -----BEGIN PGP SIGNED MESSAGE-----
| > Hash: SHA1
| > 
| > Pavel Emelyanov wrote:
| >>> Isn't it this?
| >>>
| >>> http://lkml.org/lkml/2007/11/1/141
| >> That was the initial problem, and I already answered to Ingo about
| >> it
| > 
| > No, look at my old mail which Ingo referenced in that posting.
| 
| You pointed only one problem that is not a variation of "how do 
| we handle the case when we pass our pid outside the namespace".
| 
| This problem with signals is now being resolved at IBM by Sukadev 
| and Serge (I put them in Cc), so this is about to be fixed by the
| time 2.6.24 releases (I hope).

Yes. We (Oleg, Eric included in Cc) have a patchset to address signals
issues in child pid namespaces. It is being discussed on Containers list:

https://lists.linux-foundation.org/pipermail/containers/2007-October/008240.html

We will post the patchset to LKML soon.

| 
| As far as the "passing the pid outside the namespace" is concerned, 
| is my answer "pids should never be used outside the namespace they
| came from, otherwise userspace won't work as expected" satisfactory?
| 
| So is "everything else", you mentioned, covered with the problems
| above?
| 
| > - --
| > ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
| > -----BEGIN PGP SIGNATURE-----
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| > 
-
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