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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5621) Support LinuxContainerExecutor to create symlinks for continuously localized resources
Date Fri, 09 Sep 2016 19:03:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477967#comment-15477967

Allen Wittenauer commented on YARN-5621:

Actually, that reminds me.... where *is* the input validation here? Every time we use bash,
we're opening the door to all sorts of fun metacharacter issues.

Is it possible for a user to try to get a symlink for:

1\\;rm -rf /
1"\\;rm -rf /
1\\\;;;;;;rm -rf /
1\\;;*;rm -rf /


FWIW, I'd love to see us drop the container launch script.  I haven't tried it, but I suspect
we can do lots of fun things with the env vars.  Especially if it is using execlp instead
of execl.  Just because we wrap stuff in quotes doesn't mean that code is magically safe.
(and because set -e, pipefail, etc aren't set in that launch script, it just makes it a bigger/easier

> Support LinuxContainerExecutor to create symlinks for continuously localized resources
> --------------------------------------------------------------------------------------
>                 Key: YARN-5621
>                 URL: https://issues.apache.org/jira/browse/YARN-5621
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-5621.1.patch, YARN-5621.2.patch, YARN-5621.3.patch
> When new resources are localized, new symlink needs to be created for the localized resource.
This is the change for the LinuxContainerExecutor to create the symlinks.

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