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From "Costin Leau (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9875) HDFS client requires compromising permission when running under JVM security manager
Date Mon, 29 Feb 2016 22:54:18 GMT
Costin Leau created HDFS-9875:
---------------------------------

             Summary: HDFS client requires compromising permission when running under JVM
security manager
                 Key: HDFS-9875
                 URL: https://issues.apache.org/jira/browse/HDFS-9875
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.7.2
         Environment: Linux
            Reporter: Costin Leau


HDFS _client_ requires dangerous permission, in particular _execute_ on _all files_ despite
only trying to connect to an HDFS cluster.

A full list (for both Hadoop 1 and 2) is available here along with the place in code where
they occur.
While it is understandable for some permissions to be used, requiring {{FilePermission <<ALL
FILES>> execute}} to simply initialize a class field [Shell|https://github.com/apache/hadoop/blob/0fa54d45b1cf8a29f089f64d24f35bd221b4803f/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Shell.java#L728]
which in the end is not used (since it's just a client) simply *compromises* the entire security
system.

To make matters worse, the code is executed to initialize a field so in case the permissions
is not granted, the VM fails with {{InitializationError}} which is unrecoverable.
Ironically enough, on Windows this problem does not appear since the code simply bypasses
it and initializes the field with a fall back value ({{false}}).

A quick fix would be to simply take into account that the JVM {{SecurityManager}} might be
active and the permission not granted or that the external process fails and use a fall back
value.
A proper and long-term fix would be to minimize the use of permissions for hdfs client since
it is simply not required. A client should be as light as possible and not have the server
requirements leaked onto.





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