On Fri, Oct 14, 2016 at 4:56 PM, Raphael Carvalho <raphae...@scylladb.com>

> On Fri, Oct 14, 2016 at 10:39 AM, Benoît Canet <
> ben...@cloudius-systems.com> wrote:
>> Hello list,
>> In the process of porting go to OSv I noticed that the Go runtime
>> initialization stall half the time waiting in a read for /dev/urandom.
>> The message OSv output is "random: blocking on read.".
>> It then sometime proceeed to unblock itself a couple dozen of seconds
>> later.
>> Does it ring a bell ? Is it expected behavior from /dev/urandom ?
> manpage:
> "A read from the /dev/urandom device will not block waiting for more
> entropy.  If there is not sufficient entropy, a pseudorandom number
> generator is used to  create the  requested  bytes.   As  a result, in this
> case the returned values are theoretically vulnerable to a cryptographic
> attack on the algorithms used by the driver."
> In our impl, /dev/urandom and /dev/random are both pointing to the same
> mechanism to generate random numbers, and that means they both can block.
> We should probably look into doing something for /dev/urandom to match the
> behavior described above.

We're using BSD's implementation.

It has both /dev/random and /dev/urandom unified. It's a PRNG which is
periodically reseeded.

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