Messages in this thread | | | Date | Tue, 22 Feb 2005 22:39:41 -0800 | From | Matt Mackall <> | Subject | Re: reading the same entropy twice |
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On Tue, Feb 22, 2005 at 04:55:39PM -0500, Bob O'Neill wrote: > Hello. > > I have noticed that it is possible on an SMP box for two processes to > simultaneously read the same entropy out of /dev/urandom. This > doesn't seem right to me. I was using the entropy value to generate a > random number to use as a session ID, so occasionally there would be a > collision on session IDs, causing a login failure as session IDs are > required to be unique. This issue does not appear to be related to > entropy depletion. > > Could you provide me with some insight into why this is the case, if > it is intentional? It seems like it could be addressed with a > spinlock.
This should be fixed in current kernels.
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