Bug 1377869 - Setting seccomp profile in SecurityOpts results in containers that share IPC namespaces having different SELinux contexts
Summary: Setting seccomp profile in SecurityOpts results in containers that share IPC ...
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: docker
Version: 24
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Mrunal Patel
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-09-20 20:40 UTC by Paul Morie
Modified: 2017-08-08 17:33 UTC (History)
14 users (show)

Fixed In Version:
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Last Closed: 2017-08-08 17:33:23 UTC
Type: Bug
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Description Paul Morie 2016-09-20 20:40:48 UTC
Description of problem:

If a container shares the IPC namespace of another container, the container sharing the namespace should get the same SELinux context as the container whose IPC namespace it shares.  However, setting the seccomp profile disrupts this behavior, causing containers that share an IPC namespace to receive different MCS labels from the docker engine when no SELinux context is explicitly specified.

Version-Release number of selected component (if applicable):

This is on docker 1.10.3; Mrunal has also tested this and found it to be an issue on 1.12.

How reproducible:

Create a container, using the 'unconfined' seccomp profile, and create another container that shares its IPC namespace, also using the 'unconfined' seccomp profile.  

Actual results:

The two containers will receive different process and mount labels.

Expected results:

The two containers should receive the same process and mount labels.

Additional info:

Gist from my reproducer on Kubernetes: https://gist.github.com/pmorie/05767f062d20af191ddf104971a4a5eb

Comment 1 Daniel Walsh 2016-09-21 12:11:43 UTC
Mrunal is this a docker or runc bug?

Comment 2 Mrunal Patel 2016-09-21 16:36:47 UTC
This is a docker issue. The Security Options for label sharing are getting overwritten when seccomp:unconfined is set instead of the latter being added to the options.

Comment 3 Daniel Walsh 2016-09-21 16:38:40 UTC
Ok.  Do you have a pull request or do you want me to submit one?

Comment 4 Mrunal Patel 2016-09-21 16:48:03 UTC
I am looking into it and should have a PR out today.

Comment 5 Mrunal Patel 2016-09-21 19:12:42 UTC
https://github.com/docker/docker/pull/26792

Comment 6 Fedora End Of Life 2017-07-25 23:09:52 UTC
This message is a reminder that Fedora 24 is nearing its end of life.
Approximately 2 (two) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 24. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '24'.

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Comment 7 Fedora End Of Life 2017-08-08 17:33:23 UTC
Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
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