Re: [PATCH 2/2] lguest: virtio-rng support

From: H. Peter Anvin
Date: Fri May 16 2008 - 16:29:40 EST

Johannes Berg wrote:
+/* Our random number generator device reads from /dev/urandom into the Guest's
+ * input buffers. The usual case is that the Guest doesn't want random numbers
+ * and so has no buffers although /dev/urandom is still readable, whereas
+ * console is the reverse.

Is it really a good idea to use the hosts /dev/urandom to fill the
guests /dev/random?

Only if you have an entropy estimate to go with it. It's still dubious, though: the guests own pool will do its own mixing, so you might as well pull from /dev/random in the host as being a genuine entropy source and only add what entropy is available.

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