RE: [RFC PATCH v1 00/52] Audit kernel random number use

[David Laight]

From: George Spelvin
> Sent: 28 March 2020 18:28
...
> 20..23: Changes to the prandom_u32() generator itself.  Including
>     switching to a stronger & faster PRNG.

Does this remove the code that used 'xor' to combine the output
of (about) 5 LFSR?
Or is that somewhere else?
I didn't spot it in the patches - so it might already have gone.

Using xor was particularly stupid.
The whole generator was then linear and trivially reversable.
Just using addition would have made it much stronger.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)