#14937: Tiny chunks of entropy from /dev/urandom
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Reporter: kallisti5 | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: Drivers | Version: R1/Development
Resolution: | Keywords: urandom
Blocked By: | Blocking:
Platform: All |
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Comment (by pulkomandy):
Looking at our random implementation, by default we use the Yarrow random
number generator which will always fill the passed buffer completely.
It looks like we also have a virtio driver, which will get randomness from
the host (added in 8d2bf6953e851d431fc67de1bc970c40afa79e9f). The commit
message mentions that "this can have the undesired effect of rendering
/dev/urandom slow".
Were you using that when you made this test? Because I tried to run your
code and did not reproduce your problem without enabling virtio random.
Then I tried enabling virtio random in qemu (using the command line from
the commit message) and I got a SMAP violation on boot. Apparently the
virtio random driver was never updated to use user_memcpy?
I think the virtio random should be used as an additional or alternative
entropy source for the Yarrow RNG, and not replace it completely.
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Ticket URL: <https://dev.haiku-os.org/ticket/14937#comment:6>
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