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16. Extended Attributes > Extended Attribute Implementation Details

Extended Attribute Implementation Details

In this section, we extend the overview of the preceding section to fill in a few details of the implementation of EAs.

Restrictions on user extended attributes

It is only possible to place user EAs on files and directories. Other file types are excluded for the following reasons:

  • For a symbolic link, all permissions are enabled for all users, and these permissions can’t be changed. (Symbolic link permissions have no meaning on Linux, as detailed in Section 18.2.) This means that permissions can’t be used to prevent arbitrary users from placing user EAs on a symbolic link. The resolution of this problem is to prevent all users from creating user EAs on the symbolic link.


  

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