601f11300e
Moby currently sorts uid and gid ranges in id maps. This causes subuid
and subgid files to be interpreted wrongly.
The subuid file
```
> cat /etc/subuid
jonas:100000:1000
jonas:1000:1
```
configures that the container uids 0-999 are mapped to the host uids
100000-100999 and uid 1000 in the container is mapped to uid 1000 on the
host. The expected uid_map is:
```
> docker run ubuntu cat /proc/self/uid_map
0 100000 1000
1000 1000 1
```
Moby currently sorts the ranges by the first id in the range. Therefore
with the subuid file above the uid 0 in the container is mapped to uid
100000 on host and the uids 1-1000 in container are mapped to the uids
1-1000 on the host. The resulting uid_map is:
```
> docker run ubuntu cat /proc/self/uid_map
0 1000 1
1 100000 1000
```
The ordering was implemented to work around a limitation in Linux 3.8.
This is fixed since Linux 3.9 as stated on the user namespaces manpage
[1]:
> In the initial implementation (Linux 3.8), this requirement was
> satisfied by a simplistic implementation that imposed the further
> requirement that the values in both field 1 and field 2 of successive
> lines must be in ascending numerical order, which prevented some
> otherwise valid maps from being created. Linux 3.9 and later fix this
> limitation, allowing any valid set of nonoverlapping maps.
This fix changes the interpretation of subuid and subgid files which do
not have the ids of in the numerical order for each individual user.
This breaks users that rely on the current behaviour.
The desired mapping above - map low user ids in the container to high
user ids on the host and some higher user ids in the container to lower
user on host - can unfortunately not archived with the current
behaviour.
[1] http://man7.org/linux/man-pages/man7/user_namespaces.7.html
Signed-off-by: Jonas Dohse <jonas@dohse.ch>
(cherry picked from commit
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| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| NOTICE | ||
| poule.yml | ||
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| ROADMAP.md | ||
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The Moby Project
Moby is an open-source project created by Docker to enable and accelerate software containerization.
It provides a "Lego set" of toolkit components, the framework for assembling them into custom container-based systems, and a place for all container enthusiasts and professionals to experiment and exchange ideas. Components include container build tools, a container registry, orchestration tools, a runtime and more, and these can be used as building blocks in conjunction with other tools and projects.
Principles
Moby is an open project guided by strong principles, aiming to be modular, flexible and without too strong an opinion on user experience. It is open to the community to help set its direction.
- Modular: the project includes lots of components that have well-defined functions and APIs that work together.
- Batteries included but swappable: Moby includes enough components to build fully featured container system, but its modular architecture ensures that most of the components can be swapped by different implementations.
- Usable security: Moby provides secure defaults without compromising usability.
- Developer focused: The APIs are intended to be functional and useful to build powerful tools. They are not necessarily intended as end user tools but as components aimed at developers. Documentation and UX is aimed at developers not end users.
Audience
The Moby Project is intended for engineers, integrators and enthusiasts looking to modify, hack, fix, experiment, invent and build systems based on containers. It is not for people looking for a commercially supported system, but for people who want to work and learn with open source code.
Relationship with Docker
The components and tools in the Moby Project are initially the open source components that Docker and the community have built for the Docker Project. New projects can be added if they fit with the community goals. Docker is committed to using Moby as the upstream for the Docker Product. However, other projects are also encouraged to use Moby as an upstream, and to reuse the components in diverse ways, and all these uses will be treated in the same way. External maintainers and contributors are welcomed.
The Moby project is not intended as a location for support or feature requests for Docker products, but as a place for contributors to work on open source code, fix bugs, and make the code more useful. The releases are supported by the maintainers, community and users, on a best efforts basis only, and are not intended for customers who want enterprise or commercial support; Docker EE is the appropriate product for these use cases.
Legal
Brought to you courtesy of our legal counsel. For more context, please see the NOTICE document in this repo.
Use and transfer of Moby may be subject to certain restrictions by the United States and other governments.
It is your responsibility to ensure that your use and/or transfer does not violate applicable laws.
For more information, please see https://www.bis.doc.gov
Licensing
Moby is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.