[Bug 217435] Users can panic the kernel by tracing kevents with unusual arguments.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217435

--- Comment #1 from Konstantin Belousov <kib at FreeBSD.org> ---
Created attachment 180655
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180655&action=edit
Limit the size of uio's for ktrace events and changes to max ktrio size.

The attached patch worked for me, the test program fails with invalid file
descriptor error instead of panicing debugging kernel.

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