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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10522) JniBasedUnixGroupMapping mishandles errors
Date Fri, 18 Apr 2014 22:10:18 GMT
Kihwal Lee created HADOOP-10522:
-----------------------------------

             Summary: JniBasedUnixGroupMapping mishandles errors
                 Key: HADOOP-10522
                 URL: https://issues.apache.org/jira/browse/HADOOP-10522
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Kihwal Lee
            Priority: Critical


The mishandling of errors in the jni user-to-groups mapping modules can cause segmentation
faults in subsequent calls.  Here are the bugs:

1) If {{hadoop_user_info_fetch()}} returns an error code that is not ENOENT, the error may
not be handled at all.  This bug was found by [~cnauroth].

2)  In {{hadoop_user_info_fetch()}} and {{hadoop_group_info_fetch()}}, the global {{errno}}
is directly used. This is not thread-safe and could be the cause of some failures that disappeared
after enabling the big lookup lock.

3) In the above methods, there is no limit on retries.



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