Re: [PATCH v2] RANDOM: ATH9K RNG delivers zero bits of entropy

From	Kalle Valo <kvalo@codeaurora.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] RANDOM: ATH9K RNG delivers zero bits of entropy
Date	2016-08-15 13:10 +0200
Message-ID	<s6nWh-4Oo-13@gated-at.bofh.it> (permalink)
References	<s2OV3-I9-9@gated-at.bofh.it> <s3sIN-1Y7-5@gated-at.bofh.it> <s3IaR-3wd-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

"Pan, Miaoqing" <miaoqing@qti.qualcomm.com> writes:

> The entropy was evaluated by crypto expert, the analysis report show
> the ADC with at least 10bits and up to 22 bits of min-entropy for a 32
> bits value, we conservatively assume the min-entropy is 10 bits out of
> 32 bits, so that's why set entropy quality to 320/1024 = 10/32. Also
> we have explained in the commit message why can't use the HW RNG
> framework.
>
> Otherwise, your patch will cause high CPU load, as continuously read
> ADC data if entropy bits under write_wakeup_threshold.

Please don't top post, it breaks patchwork which is extremely annoying
for me:

https://patchwork.kernel.org/patch/9266265/

https://patchwork.kernel.org/patch/9266617/

-- 
Kalle Valo

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

Re: [PATCH v2] RANDOM: ATH9K RNG delivers zero bits of entropy Kalle Valo <kvalo@codeaurora.org> - 2016-08-15 13:10 +0200

csiph-web