linux-kernel - Re: [PATCH v7 0/3] hwrng: add hwrng support for Rockchip RK3568

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAGb2v65Mm5s96asU7iaAC_sJnUk=Yuh+zMJJBbmSgETWrPLoFA@mail.gmail.com>
Date: Wed, 17 Jul 2024 10:58:51 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Daniel Golle <daniel@...rotopia.org>
Cc: Diederik de Haas <didi.debian@...ow.org>, linux-rockchip@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, Rob Herring <robh@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org, 
	Herbert Xu <herbert@...dor.apana.org.au>, Martin Kaiser <martin@...ser.cx>, 
	Sascha Hauer <s.hauer@...gutronix.de>, 
	Sebastian Reichel <sebastian.reichel@...labora.com>, Ard Biesheuvel <ardb@...nel.org>, 
	Uwe Kleine-König <ukleinek@...ian.org>, 
	devicetree@...r.kernel.org, linux-crypto@...r.kernel.org, 
	Philipp Zabel <p.zabel@...gutronix.de>, Olivia Mackall <olivia@...enic.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Dragan Simic <dsimic@...jaro.org>, 
	Aurelien Jarno <aurelien@...el32.net>, Heiko Stuebner <heiko@...ech.de>, 
	Anand Moon <linux.amoon@...il.com>
Subject: Re: [PATCH v7 0/3] hwrng: add hwrng support for Rockchip RK3568

On Wed, Jul 17, 2024 at 10:25 AM Daniel Golle <daniel@...rotopia.org> wrote:
>
> On Tue, Jul 16, 2024 at 07:19:35PM +0200, Diederik de Haas wrote:
> > On Tuesday, 16 July 2024 18:53:43 CEST Diederik de Haas wrote:
> > > rngtest: FIPS 140-2(2001-10-10) Long run: 0
> >
> > I don't know if it means something, but I noticed that I have
> > ``Long run: 0`` with all my poor results,
> > while Chen-Yu had ``Long run: 1``.
> >
> > Different SoC (RK3399), but Anand had ``Long run: 0`` too on their
> > very poor result (100% failure):
> > https://lore.kernel.org/linux-rockchip/CANAwSgTTzZOwBaR9zjJ5VMpxm5BydtW6rB2S7jg+dnoX8hAoWg@mail.gmail.com/
>
> The conclusions I draw from that rather ugly situation are:
>  - The hwrng should not be enabled by default, but it should by done
>    for each board on which it is known to work well.
>  - RK_RNG_SAMPLE_CNT as well as the assumed rng quality should be
>    defined in DT for each board:
>    * introduce new 'rochchip,rng-sample-count' property
>    * read 'quality' property already used for timeriomem_rng
>
> I will prepare a follow-up patch taking those conclusions into account.
>
> Just for completeness, here my test result on the NanoPi R5C:
> root@...nWrt:~# cat /dev/hwrng | rngtest -c 1000
> rngtest 6.15
> Copyright (c) 2004 by Henrique de Moraes Holschuh
> This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> rngtest: starting FIPS tests...
> rngtest: bits received from input: 20000032
> rngtest: FIPS 140-2 successes: 875
> rngtest: FIPS 140-2 failures: 125
> rngtest: FIPS 140-2(2001-10-10) Monobit: 123
> rngtest: FIPS 140-2(2001-10-10) Poker: 5
> rngtest: FIPS 140-2(2001-10-10) Runs: 4
> rngtest: FIPS 140-2(2001-10-10) Long run: 0
> rngtest: FIPS 140-2(2001-10-10) Continuous run: 0
> rngtest: input channel speed: (min=85.171; avg=141.102; max=4882812.500)Kibits/s
> rngtest: FIPS tests speed: (min=17.809; avg=19.494; max=60.169)Mibits/s
> rngtest: Program run time: 139628605 microseconds

I doubt this is per-board. The RNG is inside the SoC, so it could be a chip
quality thing. On the RK3399 we also saw wildly varying results.

ChenYu