[jira] [Assigned] (MESOS-5187) filesystem/linux isolator does not set the permissions of the host_path

["Gilbert Song (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-5187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilbert Song reassigned MESOS-5187:
-----------------------------------

    Assignee: Gilbert Song

> filesystem/linux isolator does not set the permissions of the host_path
> -----------------------------------------------------------------------
>
>                 Key: MESOS-5187
>                 URL: https://issues.apache.org/jira/browse/MESOS-5187
>             Project: Mesos
>          Issue Type: Bug
>          Components: containerization
>    Affects Versions: 0.26.0
>         Environment: Mesos 0.26.0, Apache Aurora 0.12
>            Reporter: Stephan Erb
>            Assignee: Gilbert Song
>
> The {{filesystem/linux}} isolator is not a drop in replacement for the {{filesystem/shared}} isolator. This should be considered before the latter is deprecated.
> We are currently using the {{filesystem/shared}} isolator together with the following slave option. This provides us with a private {{/tmp}} and {{/var/tmp}} folder for each task.
> {code}
>     --default_container_info='{
>             "type": "MESOS",
>             "volumes": [
>                 {"host_path": "system/tmp",     "container_path": "/tmp",        "mode": "RW"},
>                 {"host_path": "system/vartmp",  "container_path": "/var/tmp",    "mode": "RW"}
>             ]
>         }'
> {code}
> When browsing the Mesos sandbox, one can see the following permissions:
> {code}
> mode	nlink	uid	gid	size	mtime		
> drwxrwxrwx	3	root	root	4 KB	Apr 11 18:16	 tmp	
> drwxrwxrwx	2	root	root	4 KB	Apr 11 18:15	 vartmp	
> {code}
> However, when running with the new {{filesystem/linux}} isolator, the permissions are different:
> {code}
> mode	nlink	uid	gid	size	mtime		
> drwxr-xr-x	 2	root	root	4 KB	Apr 12 10:34	 tmp	
> drwxr-xr-x	 2	root	root	4 KB	Apr 12 10:34	 vartmp
> {code}
> This prevents user code (running as a non-root user) from writing to those folders, i.e. every write attempt fails with permission denied. 
> *Context*:
> * We are using Apache Aurora. Aurora is running its custom executor as root but then switches to a non-privileged user before running the actual user code. 
> * The follow code seems to have enabled our usecase in the existing {{filesystem/shared}} isolator: https://github.com/apache/mesos/blob/4d2b1b793e07a9c90b984ca330a3d7bc9e1404cc/src/slave/containerizer/mesos/isolators/filesystem/shared.cpp#L175-L198 



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