>Another concern would be: what UID owns files created by such processes?

I don't think it could be anything other than the current euid;
otherwise it is too easy to create files under a different uid.

>For non-basic privs we can always do things with the client's root
>credential and, when creating files, use the create_as option in NFSv4.
>Then the client could emulate FILE_DAC_*.
>
>For basic privs it's harder; if the client had a "nobody" credential
>then it could use that.

No, because it's not fine-grained enough.

Casper
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