Hard link to root-owned file now fails (since Fedora 19)

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On Fedora 18 (and every Unix since forever):

$ touch foo
$ sudo chown root.root foo
$ ln foo bar

On Fedora 19 & Rawhide:

$ touch foo
$ sudo chown root.root foo
$ ln foo bar
ln: failed to create hard link ‘bar’ => ‘foo’: Operation not permitted

Why?

Rich.

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Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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