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https://issues.apache.org/jira/browse/HDFS-11048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15645455#comment-15645455
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Eric Badger commented on HDFS-11048:
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Oops, never actually answered your question. An input of "\" would be printed
as "\" in the audit log.
> Audit Log should escape control characters
> ------------------------------------------
>
> Key: HDFS-11048
> URL: https://issues.apache.org/jira/browse/HDFS-11048
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Eric Badger
> Assignee: Eric Badger
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HDFS-11048.001.patch, HDFS-11048.002.patch
>
>
> Allowing control characters without escaping them allows for spoofing audit
> log entries at worst and accidentally breaking log parsing at best.
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