From: "Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
To: Matt Helsley <matthltc-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: Venkatesh Pallipadi
<venki-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Peter Zijlstra
<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
Shailabh Nagar
<nagar1234-xthvdsQ13ZrQT0dZR+AlfA@public.gmane.org>,
John stultz <johnstul-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Heiko Carstens
<heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>,
Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Balbir Singh
<balbir-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Martin Schwidefsky
<schwidefsky-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
holzheu-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>,
Suresh Siddha
<suresh.b.siddha-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC][PATCH 00/10] taskstats: Enhancements for precise accounting
Date: Sat, 25 Sep 2010 13:19:28 -0500 [thread overview]
Message-ID: <20100925181928.GA19611@hallyn.com> (raw)
In-Reply-To: <20100923221139.GI23839-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
Quoting Matt Helsley (matthltc-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org):
> I don't think even "root" can see/use pids outside its namespace (without
Just to be clear on this, you're right in what you say, but if a task in a child
pidns still has access to the /proc mount of the parent pidns, then it can see
the pids in there, and get information from them, i.e. /proc/pid/maps. So
in that sense, some people could misinterpret "see/use pids" and think you
weren't right.
-serge
WARNING: multiple messages have this Message-ID (diff)
From: "Serge E. Hallyn" <serge@hallyn.com>
To: Matt Helsley <matthltc@us.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Shailabh Nagar <nagar1234@in.ibm.com>,
linux-s390@vger.kernel.org,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Venkatesh Pallipadi <venki@google.com>,
John stultz <johnstul@us.ibm.com>,
containers@lists.linux-foundation.org,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Oleg Nesterov <oleg@redhat.com>,
linux-kernel@vger.kernel.org,
Suresh Siddha <suresh.b.siddha@intel.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Ingo Molnar <mingo@elte.hu>,
holzheu@linux.vnet.ibm.com, Thomas Gleixner <tglx@linutronix.de>,
Balbir Singh <balbir@linux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 00/10] taskstats: Enhancements for precise accounting
Date: Sat, 25 Sep 2010 13:19:28 -0500 [thread overview]
Message-ID: <20100925181928.GA19611@hallyn.com> (raw)
In-Reply-To: <20100923221139.GI23839@count0.beaverton.ibm.com>
Quoting Matt Helsley (matthltc@us.ibm.com):
> I don't think even "root" can see/use pids outside its namespace (without
Just to be clear on this, you're right in what you say, but if a task in a child
pidns still has access to the /proc mount of the parent pidns, then it can see
the pids in there, and get information from them, i.e. /proc/pid/maps. So
in that sense, some people could misinterpret "see/use pids" and think you
weren't right.
-serge
next prev parent reply other threads:[~2010-09-25 18:19 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-23 13:48 [RFC][PATCH 00/10] taskstats: Enhancements for precise accounting Michael Holzheu
2010-09-23 14:00 ` [RFC][PATCH 01/10] taskstats: Use real microsecond granularity for CPU times Michael Holzheu
2010-10-07 5:08 ` Balbir Singh
2010-10-08 15:08 ` Michael Holzheu
2010-10-08 16:39 ` Balbir Singh
2010-09-23 14:01 ` [RFC][PATCH 02/10] taskstats: Separate taskstats commands Michael Holzheu
2010-09-27 9:32 ` Balbir Singh
2010-10-11 7:40 ` Balbir Singh
2010-09-23 14:01 ` [RFC][PATCH 03/10] taskstats: Split fill_pid function Michael Holzheu
2010-09-23 17:33 ` Oleg Nesterov
2010-09-27 9:33 ` Balbir Singh
2010-10-11 8:31 ` Balbir Singh
2010-09-23 14:01 ` [RFC][PATCH 04/10] taskstats: Add new taskstats command TASKSTATS_CMD_ATTR_PIDS Michael Holzheu
2010-09-23 14:01 ` [RFC][PATCH 05/10] taskstats: Add "/proc/taskstats" Michael Holzheu
2010-09-23 14:01 ` [RFC][PATCH 06/10] taskstats: Add thread group ID to taskstats structure Michael Holzheu
2010-09-23 14:01 ` [RFC][PATCH 07/10] taskstats: Add per task steal time accounting Michael Holzheu
2010-09-23 14:02 ` [RFC][PATCH 08/10] taskstats: Add cumulative CPU time (user, system and steal) Michael Holzheu
2010-09-23 14:02 ` [RFC][PATCH 09/10] taskstats: Fix exit CPU time accounting Michael Holzheu
2010-09-23 17:10 ` Oleg Nesterov
2010-09-24 12:18 ` Michael Holzheu
2010-09-26 18:11 ` Oleg Nesterov
2010-09-27 13:23 ` Michael Holzheu
2010-09-27 13:42 ` Martin Schwidefsky
2010-09-27 16:51 ` Oleg Nesterov
2010-09-28 7:09 ` Martin Schwidefsky
2010-09-29 19:19 ` Roland McGrath
2010-09-30 13:47 ` Michael Holzheu
2010-10-05 8:57 ` Roland McGrath
2010-10-06 9:29 ` Michael Holzheu
2010-10-06 15:26 ` Oleg Nesterov
2010-10-07 15:06 ` Michael Holzheu
2010-10-11 12:37 ` Oleg Nesterov
2010-10-12 13:10 ` Michael Holzheu
2010-10-14 13:47 ` Oleg Nesterov
2010-10-15 14:34 ` Michael Holzheu
2010-10-19 14:17 ` Oleg Nesterov
2010-10-22 16:53 ` Michael Holzheu
2010-09-28 8:36 ` Balbir Singh
2010-09-28 9:08 ` Martin Schwidefsky
2010-09-28 9:23 ` Balbir Singh
2010-09-28 10:36 ` Martin Schwidefsky
2010-09-28 10:39 ` Balbir Singh
2010-09-28 8:21 ` Balbir Singh
2010-09-28 16:50 ` Michael Holzheu
2010-09-23 14:04 ` [RFC][PATCH 10/10] taststats: User space with ptop tool Michael Holzheu
2010-09-23 20:11 ` [RFC][PATCH 00/10] taskstats: Enhancements for precise accounting Andrew Morton
2010-09-23 20:11 ` Andrew Morton
2010-09-23 22:11 ` Matt Helsley
2010-09-24 12:39 ` Michael Holzheu
[not found] ` <20100923221139.GI23839-52DBMbEzqgQ/wnmkkaCWp/UQ3DHhIser@public.gmane.org>
2010-09-24 12:39 ` Michael Holzheu
2010-09-25 18:19 ` Serge E. Hallyn [this message]
2010-09-25 18:19 ` Serge E. Hallyn
2010-09-24 9:10 ` Michael Holzheu
2010-09-24 18:50 ` Andrew Morton
2010-09-24 18:50 ` Andrew Morton
2010-09-27 9:18 ` Michael Holzheu
2010-09-27 20:02 ` Andrew Morton
2010-09-27 20:02 ` Andrew Morton
[not found] ` <20100927130256.5d9a3db8.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2010-09-28 8:17 ` Balbir Singh
2010-09-28 8:17 ` Balbir Singh
[not found] ` <20100924115002.fcb4385a.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2010-09-27 9:18 ` Michael Holzheu
2010-09-27 10:49 ` Balbir Singh
2010-09-27 10:49 ` Balbir Singh
[not found] ` <20100923131136.356075f4.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2010-09-23 22:11 ` Matt Helsley
2010-09-24 9:10 ` Michael Holzheu
2010-09-24 9:16 ` Balbir Singh
2010-09-30 8:38 ` Andi Kleen
2010-09-30 13:56 ` Michael Holzheu
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