Re: entropy

Martin Husemann <[email protected]> wrote:
>On Fri, Nov 06, 2020 at 07:42:37PM +0000, Robert Swindells wrote:
>> 
>> Does anyone have working /dev/random on a sparc64 machine ?
>
>I do (but most of the time this machine has a ualea(4)).
>
>> Have tried creating a seed file on an amd64 machine and importing that
>> but it doesn't make any difference, python is blocked waiting for
>> entropy.
>
>Importing an entropy file only works once after boot, and I think rndctl
>does not do proper diagnostics in all cases.

I had rebooted after importing it.

>Check sysctl kern.entropy (as root), it needs to have depletion and
>needed both zero.

# sysctl -a | grep entropy
kern.entropy.collection = 1
kern.entropy.depletion = 0
kern.entropy.consolidate = 0
kern.entropy.gather = 0
kern.entropy.needed = 128
kern.entropy.pending = 0
kern.entropy.epoch = 2

>If that is not the case, do something like:
>
>	amd64# dd if=/dev/random of=/tmp/entropy bs=32 count=1
>
>thransfer the file to the U2 and do the inverse there:
>
>	U2# dd if=/tmp/entropy of=/dev/random
>
>and then check sysctl kern.entropy again.

That worked, thanks.