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From "Jason Lai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-8257) Unified Containerizer "leaks" a target container mount path to the host FS when the target resolves to an absolute path
Date Thu, 17 May 2018 01:57:00 GMT

    [ https://issues.apache.org/jira/browse/MESOS-8257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478377#comment-16478377
] 

Jason Lai commented on MESOS-8257:
----------------------------------

After discussions with [~jieyu] on the refactoring done in {{launch.cpp}} for platform-specific
support, I decided to drop some of the patches till we reach an consensus on how refactoring
should be done for {{launch.cpp}}.

The new patch chain for this particular task has become:
* https://reviews.apache.org/r/65811
* https://reviews.apache.org/r/65812
* https://reviews.apache.org/r/65900
* https://reviews.apache.org/r/67175
* https://reviews.apache.org/r/67176

I'll add more patches for tests soon.

> Unified Containerizer "leaks" a target container mount path to the host FS when the target
resolves to an absolute path
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: MESOS-8257
>                 URL: https://issues.apache.org/jira/browse/MESOS-8257
>             Project: Mesos
>          Issue Type: Bug
>          Components: containerization
>    Affects Versions: 1.3.1, 1.4.1, 1.5.0
>            Reporter: Jason Lai
>            Assignee: Jason Lai
>            Priority: Critical
>              Labels: bug, containerizer, mountpath
>
> If a target path under the root FS provisioned from an image resolves to an absolute
path, it will not appear in the container root FS after {{pivot_root(2)}} is called.
> A typical example is that when the target path is under {{/var/run}} (e.g. {{/var/run/some-dir}}),
which is usually a symlink to an absolute path of {{/run}} in Debian images, the target path
will get resolved as and created at {{/run/some-dir}} in the host root FS, after the container
root FS gets provisioned. The target path will get unmounted after {{pivot_root(2)}} as it
is part of the old root (host FS).
> A workaround is to use {{/run}} instead of {{/var/run}}, but absolute symlinks need to
be resolved within the scope of the container root FS path.



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