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https://issues.apache.org/jira/browse/HDFS-4765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656143#comment-13656143
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Aaron T. Myers commented on HDFS-4765:
--------------------------------------
I've committed this to trunk, but, perhaps obviously, it doesn't apply cleanly
to branch-2 since snapshots has not yet been merged there. Mind posting a
separate branch-2 patch, Andrew?
> Permission check of symlink deletion incorrectly throws
> UnresolvedLinkException
> -------------------------------------------------------------------------------
>
> Key: HDFS-4765
> URL: https://issues.apache.org/jira/browse/HDFS-4765
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0, 2.0.3-alpha
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-4765-1.patch, hdfs-4765-2.patch
>
>
> With permissions enabled, the permission check in {{FSNamesystem#delete}}
> will incorrectly throw an UnresolvedLinkException if the path contains a
> symlink. This leads to FileContext resolving the symlink and instead deleting
> the link target.
> The correct check is to see if the user has write permissions on the parent
> directory of the symlink, e.g.
> {noformat}
> -> % ls -ld symtest
> drwxr-xr-x 2 root root 4096 Apr 26 14:12 symtest
> -> % ls -l symtest
> total 12
> lrwxrwxrwx 1 root root 6 Apr 26 14:12 link -> target
> -rw-r--r-- 1 root root 0 Apr 26 14:11 target
> -> % rm -f symtest/link
> rm: cannot remove `symtest/link': Permission denied
> -> % sudo chown andrew symtest
> -> % rm -f symtest/link
> -> %
> {noformat}
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