Re: [RFC][PATCH] Make cryptoapi non-optional?

[Andreas Dilger]

On Aug 15, 2003  23:38 -0500, Matt Mackall wrote:
> a) extract_entropy (pool->lock)
> 
>  For nitpickers, there remains a vanishingly small possibility that
>  two readers could get identical results from the pool by hitting a
>  window immediately after reseeding, after accounting, _and_ after
>  feedback mixing.

It wasn't even vanishingly small...  We had a problem in our code where
two readers got the same 64-bit value calling get_random_bytes(), and
we were depending on this 64-bit value being unique.  This problem was
fixed by putting a spinlock around the call to get_random_bytes().

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/

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