From mboxrd@z Thu Jan 1 00:00:00 1970 From: Glauber Costa Subject: Re: [PATCH 00/11] pkg-shadow support subordinate ids with user namespaces Date: Fri, 22 Feb 2013 21:09:43 +0400 Message-ID: <5127A657.3010909@parallels.com> References: <87d2wxshu0.fsf@xmission.com> <51276189.5040803@parallels.com> <87zjyw489z.fsf@xmission.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87zjyw489z.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: "Eric W. Biederman" Cc: Linux Containers , Pkg-shadow-devel-XbBxUvOt3X2LieD7tvxI8l/i77bcL1HB@public.gmane.org, "Michael Kerrisk (man-pages)" , =?ISO-8859-1?Q?Nicolas_Fran=E7ois?= List-Id: containers.vger.kernel.org On 02/22/2013 08:34 PM, Eric W. Biederman wrote: > Glauber Costa writes: > >> On 01/22/2013 01:11 PM, Eric W. Biederman wrote: >>> >>> The kernel support for user namespaces allows ordinary users to use >>> multiple uids and gids if they can get a trusted program to tell the >>> kernel the set of subordinate uids and gids they are allowed to use. >>> >>> This is my work to make that trusted program. >>> Two new files are added /etc/subuid /etc/subgid that specify >>> ranges of uids and gids that users may uses. >>> >>> useradd, and newusers are modifed to add users to those files. >>> >>> userdel is modeifed to remove users from those files. >>> >>> usermod is modified to give manual control of what goes in those files. >>> >>> newuidmap and newgidmap read the new files and update >>> /proc/[pid]/uid_map and /proc/[pid]/gid_map respectively >>> as requested by their command line parameters and as allowed >>> by the /etc/subuid and /etc/subgid. >>> >>> The following patches are against the current developent trunk >>> of pkg-shadow svn rev 3745. With minor tweaking of man/Makefile.am >>> these patches also apply to shadow 4.1.5. >>> >>> Eric W. Biederman (11): >>> Documentation for /etc/subuid and /etc/subgid >>> login.defs.5: Document the new variables in login.defs >>> Implement commonio_append. >>> Add backend support for suboridnate uids and gids >>> Implement find_new_sub_uids find_new_sub_gids >>> userdel: Add support for removing subordinate user and group ids. >>> useradd: Add support for subordinate user identifiers >>> Add support for detecting busy subordinate user ids >>> usermod: Add support for subordinate uids and gids. >>> newusers: Add support for assiging subordinate uids and gids. >>> newuidmap,newgidmap: New suid helpers for using subordinate uids and gids >> >> Hi, >> >> Is there any intention to merge this (or any later version thereof) ? >> I intend to start excluding uid ranges for containers usage in OpenVZ, >> and support for that in tooling would come in handy. > > I don't know what the state of the main pkg-shadow package is. I have > heard anything and the repository seems to have been dormant since the > last release almost a year ago. > > However the last I heard Serge was working on getting these changes into > Ubuntu. > > So the intention is to get this code merged but I don't know what more > needs to be done at this point. > I understand, this was more a question for the package maintainers. It would be interesting for us to have those changes more widely available than just @Ubuntu