From: Oleg Nesterov <oleg@redhat.com>
To: "Serge E. Hallyn" <serge.hallyn@canonical.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
richard@nod.at, Andrew Morton <akpm@google.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Tejun Heo <tj@kernel.org>,
serge@hallyn.com
Subject: Re: [PATCH] user namespace: make signal.c respect user namespaces
Date: Tue, 20 Sep 2011 20:17:51 +0200 [thread overview]
Message-ID: <20110920181751.GC22317@redhat.com> (raw)
In-Reply-To: <20110920164524.GA8214@sergelap>
On 09/20, Serge E. Hallyn wrote:
>
> Quoting Oleg Nesterov (oleg@redhat.com):
> >
> > I didn't really check, but afaics send_sigio_to_task/etc never use
> > SEND_SIG_NOINFO. And they shouldn't, there is no the sending process.
>
> (I'm sure you're right -
I am not that sure, please recheck ;)
> > I guess ptrace_signal() can even do
> >
> > info->si_pid = task_pid_vnr(current->parent);
> >
> > if (info->si_pid) // same namespace
> > info->si_uid = current_uid();
> > else // can't see the tracer, we are from the sub-namespace
> > info->si_uid = 0;
> >
> > Whatever you like more.
>
> Except you don't have to split pid and user namespaces at the same
> time.
Argh, you mean CLONE_NEWUSER? I fotgot about it. And probably
there is something else which I simply do not know?
I got lost. This means send_signal() can't rely on from_parent_ns.
I have no idea how can we fix sys_kill() without a lot of ugly changes
then.
Oleg.
next prev parent reply other threads:[~2011-09-20 18:21 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-19 21:45 [PATCH] user namespace: make signal.c respect user namespaces Serge E. Hallyn
2011-09-19 21:47 ` [PATCH] user namespace: usb: make usb urbs user namespace aware Serge E. Hallyn
2011-09-20 13:17 ` Oleg Nesterov
2011-09-20 13:33 ` Serge E. Hallyn
2011-09-21 5:01 ` [PATCH] user namespace: usb: make usb urbs user namespace aware (v2) Serge E. Hallyn
2011-09-21 18:31 ` Oleg Nesterov
2011-09-21 19:12 ` Serge E. Hallyn
2011-09-21 19:18 ` Greg KH
2011-09-23 1:27 ` [PATCH resend] " Serge E. Hallyn
2011-09-23 15:48 ` Alan Stern
2011-09-23 16:06 ` Serge E. Hallyn
2011-09-23 16:21 ` Alan Stern
2011-09-23 17:22 ` Serge E. Hallyn
2011-09-23 18:35 ` Alan Stern
2011-09-20 12:22 ` [PATCH] user namespace: make signal.c respect user namespaces Oleg Nesterov
2011-09-20 12:44 ` Serge E. Hallyn
2011-09-20 13:41 ` Oleg Nesterov
2011-09-20 14:39 ` [PATCH 0/2] (Was: user namespace: make signal.c respect user namespaces) Oleg Nesterov
2011-09-20 14:39 ` [PATCH 1/2] creds: kill __task_cred()->task_is_dead() check Oleg Nesterov
2011-09-20 15:14 ` drivers/staging/usbip/ abuses task_is_dead/exit_state Oleg Nesterov
2011-09-20 18:38 ` Greg KH
2012-03-06 17:39 ` ping: " Oleg Nesterov
2012-03-06 19:30 ` Tobias Klauser
2012-03-08 18:57 ` Oleg Nesterov
2012-03-13 11:45 ` Tobias Klauser
2012-03-13 18:07 ` [PATCH] staging: usbip: fix the usage of kthread_stop() Oleg Nesterov
2012-04-01 23:17 ` Oleg Nesterov
2012-04-02 8:11 ` Tobias Klauser
2011-09-20 15:28 ` [PATCH 1/2] creds: kill __task_cred()->task_is_dead() check Paul E. McKenney
2011-09-20 15:40 ` Oleg Nesterov
2011-09-20 15:48 ` Paul E. McKenney
2011-09-20 16:27 ` David Howells
2011-09-20 14:39 ` [PATCH 2/2] creds: __task_cred(current) doesn't need rcu_read_lock_held() Oleg Nesterov
2011-09-20 15:07 ` Serge Hallyn
2011-09-20 15:35 ` Oleg Nesterov
2011-09-20 16:19 ` David Howells
2011-09-20 16:38 ` Oleg Nesterov
2011-09-20 16:50 ` David Howells
2011-09-20 17:13 ` Oleg Nesterov
2011-09-20 15:39 ` [PATCH] user namespace: make signal.c respect user namespaces Serge Hallyn
2011-09-20 16:24 ` Oleg Nesterov
2011-09-20 16:45 ` Serge E. Hallyn
2011-09-20 18:17 ` Oleg Nesterov [this message]
2011-09-21 5:00 ` [PATCH] user namespace: make signal.c respect user namespaces (v2) Serge E. Hallyn
2011-09-20 17:48 ` [PATCH] user namespace: make signal.c respect user namespaces Oleg Nesterov
2011-09-20 18:53 ` Serge E. Hallyn
2011-09-21 17:53 ` Oleg Nesterov
2011-09-22 15:23 ` Serge Hallyn
2011-09-23 16:31 ` Serge E. Hallyn
2011-09-23 17:36 ` Oleg Nesterov
2011-09-23 21:20 ` Serge E. Hallyn
2011-09-24 16:37 ` Oleg Nesterov
2011-09-25 20:17 ` Serge E. Hallyn
2011-09-26 16:06 ` Oleg Nesterov
2011-09-27 14:28 ` Serge Hallyn
2011-09-27 14:38 ` Oleg Nesterov
2011-09-27 15:27 ` Serge Hallyn
2011-09-27 17:12 ` Oleg Nesterov
2011-10-04 17:42 ` Serge E. Hallyn
2011-10-09 19:00 ` Oleg Nesterov
2011-10-11 13:08 ` Serge E. Hallyn
2011-10-08 20:02 ` Serge E. Hallyn
2011-10-09 19:03 ` Oleg Nesterov
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=20110920181751.GC22317@redhat.com \
--to=oleg@redhat.com \
--cc=akpm@google.com \
--cc=ebiederm@xmission.com \
--cc=linux-kernel@vger.kernel.org \
--cc=richard@nod.at \
--cc=serge.hallyn@canonical.com \
--cc=serge@hallyn.com \
--cc=tj@kernel.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.