From: Oleg Nesterov <oleg@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Linux Containers <containers@lists.linux-foundation.org>,
linux-kernel@vger.kernel.org, Serge Hallyn <serge@hallyn.com>,
Gao feng <gaofeng@cn.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 11/11] pidns: Support unsharing the pid namespace.
Date: Wed, 19 Dec 2012 19:14:00 +0100 [thread overview]
Message-ID: <20121219181400.GA22991@redhat.com> (raw)
In-Reply-To: <1353083750-3621-11-git-send-email-ebiederm@xmission.com>
Hi Eric,
oleg@tv-sign.ru no longer works, so I just noticed these emails.
On 11/16, Eric W. Biederman wrote:
>
> Unsharing of the pid namespace unlike unsharing of other namespaces
> does not take affect immediately. Instead it affects the children
> created with fork and clone.
I'll try to read this series later, but I am not sure I will ever
understand the code with these patches ;)
So alloc_pid() becomes the only user nsproxy->pid_ns and it is not
necessarily equal to task_active_pid_ns(). It seems to me that this
adds a lot of new corner cases.
Unless I missed something, at least we should not allow CLONE_THREAD
if active_pid_ns != nsproxy->pid_ns. If nothing else, copy_process()
initializes ->child_reaper only if thread_group_leader(child). And
->child_reaper == NULL can obviously lead to crash.
Oleg.
next prev parent reply other threads:[~2012-12-19 18:14 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-16 16:32 [REVIEW][PATCH 0/11] pid namespace cleanups and enhancements Eric W. Biederman
2012-11-16 16:35 ` [PATCH 01/11] procfs: Use the proc generic infrastructure for proc/self Eric W. Biederman
2012-11-16 16:35 ` [PATCH 02/11] procfs: Don't cache a pid in the root inode Eric W. Biederman
2012-11-21 1:07 ` Gao feng
2012-11-16 16:35 ` [PATCH 03/11] pidns: Capture the user namespace and filter ns_last_pid Eric W. Biederman
2012-11-21 1:26 ` Gao feng
2012-11-16 16:35 ` [PATCH 04/11] pidns: Use task_active_pid_ns where appropriate Eric W. Biederman
2012-11-21 2:02 ` Gao feng
2012-11-16 16:35 ` [PATCH 05/11] pidns: Make the pidns proc mount/umount logic obvious Eric W. Biederman
2012-11-19 11:02 ` Gao feng
2012-11-16 16:35 ` [PATCH 06/11] pidns: Don't allow new processes in a dead pid namespace Eric W. Biederman
2012-11-21 2:17 ` Gao feng
2012-11-16 16:35 ` [PATCH 07/11] pidns: Wait in zap_pid_ns_processes until pid_ns->nr_hashed == 1 Eric W. Biederman
2012-11-21 2:24 ` Gao feng
2012-12-19 18:47 ` Oleg Nesterov
2012-12-21 1:19 ` Eric W. Biederman
2012-12-21 14:11 ` Oleg Nesterov
2012-12-21 15:02 ` Oleg Nesterov
2012-12-21 15:31 ` Oleg Nesterov
2012-12-21 18:42 ` Eric W. Biederman
2012-12-21 18:33 ` Eric W. Biederman
2012-11-16 16:35 ` [PATCH 08/11] pidns: Deny strange cases when creating pid namespaces Eric W. Biederman
2012-11-21 2:25 ` Gao feng
2012-11-16 16:35 ` [PATCH 09/11] pidns: Add setns support Eric W. Biederman
2012-11-19 9:11 ` Gao feng
2012-11-19 9:27 ` Eric W. Biederman
2012-11-21 2:36 ` Gao feng
2012-11-16 16:35 ` [PATCH 10/11] pidns: Consolidate initialzation of special init task state Eric W. Biederman
2012-11-21 2:56 ` Gao feng
2012-11-16 16:35 ` [PATCH 11/11] pidns: Support unsharing the pid namespace Eric W. Biederman
2012-11-21 2:55 ` Gao feng
2012-12-19 18:14 ` Oleg Nesterov [this message]
2012-12-21 1:43 ` Eric W. Biederman
2012-12-21 15:49 ` Oleg Nesterov
2012-12-21 17:51 ` Eric W. Biederman
2012-12-21 19:24 ` Rob Landley
2012-12-21 22:58 ` namespace documentation Eric W. Biederman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121219181400.GA22991@redhat.com \
--to=oleg@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=containers@lists.linux-foundation.org \
--cc=ebiederm@xmission.com \
--cc=gaofeng@cn.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=serge@hallyn.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).