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From: "Jack Mitchell" <ml@embed.me.uk>
To: Ross Burton <ross@burtonini.com>,
	Otavio Salvador <otavio.salvador@gmail.com>
Cc: OpenEmbedded Core Mailing List
	<openembedded-core@lists.openembedded.org>,
	Otavio Salvador <otavio@ossystems.com.br>
Subject: Re: [OE-core] [PATCH] openssh: Allow enable/disable of rng-tools recommendation on sshd
Date: Fri, 25 Sep 2020 11:06:39 +0100	[thread overview]
Message-ID: <dab01611-1e79-0942-69bd-93f742168625@embed.me.uk> (raw)
In-Reply-To: <CAAnfSTvrT7_40JPPpeNM7eJouLK7e0VELGRMHgd-VjKSfa+y5Q@mail.gmail.com>

On 25/09/2020 10:58, Ross Burton wrote:
> On Thu, 24 Sep 2020 at 20:58, Otavio Salvador <otavio.salvador@gmail.com> 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
> 
> 
> 
> 
> 

  parent reply	other threads:[~2020-09-25 10:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-24 19:58 [PATCH] openssh: Allow enable/disable of rng-tools recommendation on sshd Otavio Salvador
2020-09-25  8:51 ` [OE-core] " Jack Mitchell
2020-09-25  9:50   ` Ross Burton
2020-09-25  9:58 ` Ross Burton
2020-09-25 10:04   ` Richard Purdie
2020-09-25 10:06   ` Jack Mitchell [this message]
2020-09-25 12:09   ` Otavio Salvador
2020-09-27  5:23   ` Khem Raj

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