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https://issues.apache.org/jira/browse/HDFS-6556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HDFS-6556:
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Attachment: RefinedPermissions-HDFS-6556.patch
I have attached the initial patch which refines the xattrs permissions.
User.* - can be decided by regular file permissions and for sticky bit dirs,
owner and super user can write xattrs.
trusted.* - allowed only for super users.
> Refine XAttr permissions
> ------------------------
>
> Key: HDFS-6556
> URL: https://issues.apache.org/jira/browse/HDFS-6556
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Yi Liu
> Assignee: Uma Maheswara Rao G
> Fix For: 2.5.0
>
> Attachments: RefinedPermissions-HDFS-6556.patch
>
>
> After discuss with Uma, we should refine setting permissions of {{user}} and
> {{trusted}} namespace xattrs.
> *1.* For {{user}} namespace xattrs, In HDFS-6374, says "setXAttr should
> require the user to be the owner of the file or directory", we have a bit
> misunderstanding. It actually is:
> {quote}
> The access permissions for user attributes are defined by the file permission
> bits. only regular files and directories can have extended attributes. For
> sticky directories, only the owner and privileged user can write attributes.
> {quote}
> We can refer to linux source code in
> http://lxr.free-electrons.com/source/fs/xattr.c?v=2.6.35
> I also check in linux, it's controlled by the file permission bits for
> regular files and directories (not sticky).
> *2.* For {{trusted}} namespace, currently we require the user should be owner
> and superuser. Actually superuser is enough.
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