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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3134) harden edit log loader against malformed or malicious input
Date Wed, 02 May 2012 01:48:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-3134:
---------------------------------------

    Attachment: HDFS-3134.007.patch

* rebase again.  :P
                
> harden edit log loader against malformed or malicious input
> -----------------------------------------------------------
>
>                 Key: HDFS-3134
>                 URL: https://issues.apache.org/jira/browse/HDFS-3134
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-3134.001.patch, HDFS-3134.002.patch, HDFS-3134.003.patch, HDFS-3134.004.patch,
HDFS-3134.005.patch, HDFS-3134.006.patch, HDFS-3134.007.patch
>
>
> Currently, the edit log loader does not handle bad or malicious input sensibly.
> We can often cause OutOfMemory exceptions, null pointer exceptions, or other unchecked
exceptions to be thrown by feeding the edit log loader bad input.  In some environments, an
out of memory error can cause the JVM process to be terminated.
> It's clear that we want these exceptions to be thrown as IOException instead of as unchecked
exceptions.  We also want to avoid out of memory situations.
> The main task here is to put a sensible upper limit on the lengths of arrays and strings
we allocate on command.  The other task is to try to avoid creating unchecked exceptions (by
dereferencing potentially-NULL pointers, for example).  Instead, we should verify ahead of
time and give a more sensible error message that reflects the problem with the input.

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