linux-kernel - Re: [PATCH 1/2] random: use chacha20 for get_random

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Date:   Fri, 20 Jan 2017 19:15:09 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH 1/2] random: use chacha20 for get_random_int/long

On Fri, Jan 20, 2017 at 04:47:42PM +0100, Jason A. Donenfeld wrote:
> 
> What do you mean? Nothing is wasted right now. The u64 function only
> gets u64s from a dedicated u64 array. The u32 function only gets u32s
> from a dedicated u32 array. There are separate batched entropy arrays
> for each function.

But there is a shared pointer, which is used both for the dedicated
u32 array and the dedicated u64 array.  So when you increment the
pointer for the get_random_u32, the corresponding entry in the u64
array is wasted, no?

						- Ted