bird2/patches/0005-Better-initialization-of-random-generator.patch

   1 From eaf63d314d50cba5b2cfa8f18de64a91d3131b94 Mon Sep 17 00:00:00 2001
   2 From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
   3 Date: Thu, 3 May 2018 17:07:39 +0200
   4 Subject: [PATCH 2/2] Better initialization of random generator
   5
   6 Use full time precision to initialize random generator. The old
   7 code was prone to initialize it to the same values in specific
   8 circumstances (boot without RTC, multiple VMs starting at once).
   9 ---
  10  sysdep/unix/io.c | 4 +++-
  11  1 file changed, 3 insertions(+), 1 deletion(-)
  12
  13 diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
  14 index 012deaf0..11a0d6f1 100644
  15 --- a/sysdep/unix/io.c
  16 +++ b/sysdep/unix/io.c
  17 @@ -2144,7 +2144,9 @@ io_init(void)
  18    // XXX init_times();
  19    // XXX update_times();
  20    boot_time = current_time();
  21 -  srandom((uint) (current_real_time() TO_S));
  22 +
  23 +  u64 now = (u64) current_real_time();
  24 +  srandom((uint) (now ^ (now >> 32)));
  25  }
  26
  27  static int short_loops = 0;
  28 --
  29 2.17.0
  30