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https://issues.apache.org/jira/browse/HDFS-10276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15485143#comment-15485143
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Zhe Zhang commented on HDFS-10276:
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Thanks [~kevincox] [~yuanbo] [~yzhangal] for the work. I think it's a valid
improvement for 2.7 as well; just backported it to branch-2.7.
> HDFS should not expose path info that user has no permission to see.
> --------------------------------------------------------------------
>
> Key: HDFS-10276
> URL: https://issues.apache.org/jira/browse/HDFS-10276
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kevin Cox
> Assignee: Yuanbo Liu
> Fix For: 2.8.0, 2.7.4, 3.0.0-alpha1
>
> Attachments: HDFS-10276.001.patch, HDFS-10276.002.patch,
> HDFS-10276.003.patch, HDFS-10276.004.patch, HDFS-10276.005.patch,
> HDFS-10276.006.patch
>
>
> This following issue is remedied by HDFS-5802.
> {quote}
> Given you have a file {{/file}} an existence check for the path
> {{/file/whatever}} will give different responses for different
> implementations of FileSystem.
> LocalFileSystem will return false while DistributedFileSystem will throw
> {{org.apache.hadoop.security.AccessControlException: Permission denied: ...,
> access=EXECUTE, ...}}
> {quote}
> However, HDFS-5802 may expose information about a path that user doesn't have
> permission to see.
> For example, if the user asks for /a/b/c, but does not have permission to
> list /a, we should not complain about /a/b
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