Messages in this thread | | | Date | Fri, 11 Jul 2014 18:56:26 +0530 | From | Amit Shah <> | Subject | Re: [RFC PATCH] hwrng: sysfs entry rng_seed_kernel, was: "Re: [PATCH v2 1/2] hwrng: fetch randomness only after device init" |
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On (Wed) 09 Jul 2014 [12:07:25], Jason Cooper wrote: > Amit, Kees,
(snip)
> I'm cooling to the idea of the init function for virtio-rng, and it > might be best just to admit that there's no way to seed the entropy pool > from the virtio-rng at probe time. After all, once userspace is up, the > system should take advantage of /dev/hwrng for the generation of > long-term keys. Either via rngd feeding /dev/random, or directly. > > As for the follow-on patch you asked about, I think that's fine. More > entropy can't hurt. > > The below patch might be worth considering so that the user of a system > with only virtio-rng can kick the entropy pool as they see fit. It's > probably not too kosher as is, but if the idea is liked, I could clean > it up and submit. > > The advantage is that users don't need to have rngd installed and > running on the system in order to jump-start the entropy pool.
... so a udev rule that looks for the new sysfs file, and asks the kernel to do its thing?
And maybe even a patch to rngd that looks for this file and does a similar thing?
There's also the option to use a delayed workqueue item, that will succeed if probe has finished. This method doesn't have userspace dependencies.
Thanks,
Amit
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