package/base/linux/0110-give-rdrand-some-credit.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Arjan van de Ven <arjan@linux.intel.com>
   3 Date: Fri, 29 Jul 2016 19:10:52 +0000
   4 Subject: [PATCH] give rdrand some credit
   5
   6 try to credit rdrand/rdseed with some entropy
   7
   8 In VMs but even modern hardware, we're super starved for entropy, and while we can
   9 and do wear a tin foil hat, it's very hard to argue that
  10 rdrand and rdtsc add zero entropy.
  11 ---
  12  drivers/char/random.c | 2 ++
  13  1 file changed, 2 insertions(+)
  14
  15 diff --git a/drivers/char/random.c b/drivers/char/random.c
  16 index 2a41b21623ae..d4ecc0e9aef7 100644
  17 --- a/drivers/char/random.c
  18 +++ b/drivers/char/random.c
  19 @@ -1781,6 +1781,8 @@ static void __init init_std_data(struct entropy_store *r)
  20                 if (!arch_get_random_seed_long(&rv) &&
  21                     !arch_get_random_long(&rv))
  22                         rv = random_get_entropy();
  23 +               else
  24 +                       credit_entropy_bits(r, 1);
  25                 mix_pool_bytes(r, &rv, sizeof(rv));
  26         }
  27         mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
  28 --
  29 https://clearlinux.org
  30