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SubjectRe: [PATCH v1] crypto: caam - set hwrng quality level
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On 03.08.2017 09:48, Horia Geantă wrote:
> On 8/3/2017 6:17 AM, Herbert Xu wrote:
>> On Wed, Aug 02, 2017 at 02:03:14PM +0000, Horia Geantă wrote:
>>>
>>> Take CAAM's engine HWRNG: it can work both as a TRNG and as a
>>> TRNG-seeded DRBG (that's how it's currently configured).
>>> IIUC, both setups are fit as source for the entropy pool.
>>
>> So which is it? If it's a DRBG then it should not be exposed through
>> the hwrng interface. Only TRNG should go through hwrng. DRBGs
>> can use the crypto rng API.
>
> Right now it's configured as a DRBG.
> If I read correctly, it doesn't matter it's using the internal TRNG for
> (automated) seeding, it still shouldn't use hwrng.
> This means it's broken since the very beginning:
> e24f7c9e87d4 crypto: caam - hwrng support

Hmmm..
- what is the security risk of this issue? For example system which use
/dev/hwrng directly?
- And who will fix it?

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