Re: Linux messages full of `random: get_random_u32 called from`

[Theodore Y. Ts'o]

On Tue, Apr 24, 2018 at 01:48:16PM +0200, Paul Menzel wrote:
> Dear Linux folks,
> 
> w
> Since Linux 4.17-rcX, Linux spams a lot of `random: get_random_u32 called
> from` messages. I believe, this setting should be reverted by default as
> otherwise a lot of other messages are not seen.

Can you tell me a bit about your system?  What distribution, what
hardware is present in your sytsem (what architecture, what
peripherals are attached, etc.)?

There's a reason why we made this --- we were declaring the random
number pool to be fully intialized before it really was, and that was
a potential security concern.  It's not as bad as the weakness
discovered by Nadia Heninger in 2012.  (See https://factorable.net for
more details.)  However, this is not one of those things where we like
to fool around.

So I want to understand if this is an issue with a particular hardware
configuration, or whether it's just a badly designed Linux init system
or embedded setup, or something else.  After all, you wouldn't want
the NSA spying on all of your network traffic, would you?  :-)

    	       	      	      	      - Ted