Sources of entropy?

uml-devel roland 2 participants 2 messages May 23, 2004 – May 27, 2004 1 message not in the archive User-mode Linux (UML)

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roland

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2004-05-23 14:51 UTC #1 lore raw

hi,
afaik, uml still has a general problem with /dev/random entropy. please read:
http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=107914271712404&w=2

proxying /dev/random from the host sounds like a good solution. is there work in progress ?

regards
roland

----- Original Message -----
From: "Chris Snyder" <[email protected]>
To: <[email protected]>
Sent: Saturday, May 22, 2004 10:18 PM
Subject: [uml-user] Sources of entropy?

Quoted 7 lines

I'm having a problem with a UML that I have set up as a Kerberos server:
starting the Kerberos Admin Daemon takes around ten minutes because there is very little entropy available in the UML, making reads from /dev/random block. Has anyone else ran into this problem? How can I most effectively deal with this? Thanks in advance.

Quoted 10 lines

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Henrik Nordstrom

2004-05-27 12:06 UTC #2 lore raw

Quoted 5 lines · roland

afaik, uml still has a general problem with /dev/random entropy. please read:
http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=107914271712404&w=2
proxying /dev/random from the host sounds like a good solution.

Better yet to implement a /dev/random entropy source in UML using the host /dev/random.. it should be as simple as a kernel thread polling for write on the UML /dev/random, pulling entropy in from the host as needed.

But if it is possible to proxy devices then obviously the above can easily be done in a normal user process, moving entropy from the proxied random device to the UML random device.

Regards
Henrik