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Posted a patch to upstream:

http://lists.nongnu.org/archive/html/qemu-stable/2013-11/msg00045.html

Hi Junyi,

  We need a test to verify the data is really random, it might catch this bug.
  eg: generate a lot of numbers from 1 ~ 100,  then check the distribution
  Or using some software to verify it.

Amos

Fix included in qemu-kvm-1.5.3-20.el7

Verified on qemu-kvm-rhev-1.5.3-31.el7.x86_64:

read 100 characters, it's random.

'\x07\xdf\xf8W\x16\xb4)\xb2tndm}\xcb\xb1\xdd\'\xf2\xf3\x1c*\xbb\xe1\xad\xb3"=\xd0G\x83\xe7\x01K|\xacAP\xdc\xcf\xb9\x97\xb4\x85G\x8f!\xd8\xf9\xb9\xcf}\x98&N\x8eg\x10\x98\\\xd6u\xe6H~\xc5\xf9\xc6\x02\xa3t\x17\xbc6\xa0,\xfd\xb3\x87W\xc6\x047\xae\xa3\xbe\x88\xa2M\xd0\x92Q@r\xcc\xfai\x1b\x08^\xb6'

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.