On 25/09/2020 10:58, Ross Burton wrote: > On Thu, 24 Sep 2020 at 20:58, Otavio Salvador <[email protected]> > wrote: >> We are adding a new PACKAGECONFIG option ('rng-tools') to control if we >> wish the openssh-sshd to RRECOMMENDS the 'rng-tools' package. We are >> enabling it by default so there is no behavior change. > > Is this fundamentally because many targets now have hardware RNGs that > the kernel is using, and so rng-tools serves no purpose? > > This was originally added with data from iMX6 (oe-core > 9b01375236e19e3366c58877c4154d7c71632984) and I'm curious if this > followup is related to other improvements that have been made to iMX6 > since. Is there a better user space tool, or is the kernel using the > hardware RNG out of the box? >
While I haven't had the time to explore the issue fully on my boards, the issue I have specifically is that when the board is powered for a short amount of time, systemd gets stuck on shutting down as rngd is blocking for (I assume) a certain amount of entropy for it to enter the ready state. Whether this is down to the specific hardware rng support on my board, or possibly the lack of it being enabled I haven't dug into yet. > I ask because I'm strongly tempted to argue that we should be assuming > that a RNG is available and let BSPs turn this on if required. > > Ross > > > > >
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