linux-kernel - [RFC][PATCH 0/1]a new optional function for task assignment to cgroup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <47CE322A.9060907@ak.jp.nec.com>
Date:	Wed, 05 Mar 2008 14:39:54 +0900
From:	Kazunaga Ikeno <k-ikeno@...jp.nec.com>
To:	containers@...ts.linux-foundation.org
CC:	linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 0/1]a new optional function for task assignment to cgroup

Hi -

This is a patch of a new optional function for task assignment to cgroup, RFC.


== Purpose =================================================

To provide the function that leads a task, corresponding to the conditions specified
beforehand, to a specific cgroup directory.


== Description =============================================

This patch provides the function that leads a task, corresponding to the conditions
specified beforehand, to a specific cgroup directory.

Currently, this patch uses user-id as a condition to lead a task. On its I/F,
specifies user-id of a task and a cgroup directory.

The task set to specified user-id will automatically lead to the cgroup directory.
(it is attached to specific cgroup)

This function makes possible to attach a task to cgroup automatically when
specific user logs in, also to attach a task of a service which is set to
specific effective user-id to specific cgroup mechanically.

This function is just option, all the functions of cgroup are the same.
Also the migration of a task between cgroup directories can do by rewriting pid
of a control tasks file, including a task leading by this option.

It is able to enter two or more set of user-id and cgroup directory.
Specified cgroup directory may be the same or that may not be.
But it's not able to enter same user-id to plural cgroup directories to lead.


== Interface ===============================================

   /lead_option  -  control file of this option

[example for reading a configuration]

       # cat /cgroup/lead_option

       uid:202        leadto:/cpuset/bar_cg
       uid:201        leadto:/cpuset/foo_cg

      * nothing appears before assignment.

[example for adding an entry]
- To lead a task(uid 201) to /cgroup/foo_cg

       # echo uid:201 leadto:/cpuset/foo_cg > /cpuset/lead_option

       * set a uid of task and cgroup dirctory to lead.
       * Remake an entry uid to cgroup directory if set uid already exists.

[example for delete an entry]
- To delete an entry of uid

       # echo uid:201 > /cpuset/lead_option

       * To delete a registration, omit "leadto:" token.


== Operation example (chronological order) ==================

The follows is an example of the operation.

# ############################
# # Various confirmation before testing
# ############################
# id
uid=0(root) gid=0(root) groups=0(root)
# df /cpuset
Filesystem           1K-blocks      Used Available Use% Mounted on
none                         0         0         0   -  /cpuset
# more /proc/self/cgroup
cpuset:/
# id foo
uid=201(foo) gid=100(users) groups=100(users)
# id bar
uid=202(foo) gid=100(users) groups=100(users)
# ############################
# # Add an entry of user foo,bar
# ############################
# echo uid:201 leadto:/cpuset/foo_cg > /cpuset/lead_option
# echo uid:202 leadto:/cpuset/bar_cg > /cpuset/lead_option
# more /cpuset/lead_option
uid:202        leadto:/cpuset/bar_cg
uid:201        leadto:/cpuset/foo_cg
# ############################
# # Confirmation of the assignment of user foo,bar - (1)
# ############################
# su - foo
$ more /proc/$$/cgroup
cpuset:/foo_cg
$ more /proc/self/cgroup
cpuset:/foo_cg
$ su bar --command "more /proc/self/cgroup"
cpuset:/bar_cg
$ exit
# ############################
# # Delete an entry of user foo,bar
# ############################
# echo uid:201 > /cpuset/lead_option
# echo uid:202 > /cpuset/lead_option
# more /cpuset/lead_option
# ############################
# # Confirmation of the assignment of user foo,bar - (2)
# ############################
# su - foo
$ more /proc/$$/cgroup
cpuset:/
$ su bar --command "more /proc/self/cgroup"
cpuset:/
$


Thanks,
- Kazunaga Ikeno.



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/