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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6556) Refine XAttr permissions
Date Wed, 18 Jun 2014 05:06:10 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yi Liu updated HDFS-6556:
-------------------------

    Description: 
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. 

  was:
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 + superuser.
Actually superuser is enough. 


> 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: Yi Liu
>             Fix For: 2.5.0
>
>
> 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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