[Bug 283538] Linux NFSv4 server generates incorrect XDR for RPC reply

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283538

            Bug ID: 283538
           Summary: Linux NFSv4 server generates incorrect XDR for RPC
                    reply
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rmacklem@FreeBSD.org

When a NFSv4 mount of a Linux knfsd (the default one
in the Linux kernel) is done, it is possible for the
Linux server to generate incorrect XDR for an RPC reply.

This occurs when the reply XDR for an operation before the
last one ends at exactly 4bytes shy of a page boundary in
the Linux server's reply buffer.

This has been observed for Readdir replies, resulting in
a truncated "ls" output in the client, although the files
exist in the file system on the Linux server.

Although this is a Linux server bug, the PR is being created
to keep track of it, since the FreeBSD client is most likely
to experience it, since it does a GETATTR operation after
the READDIR operation in the compound RPC.

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