[PATCH v3 3/5] random: Seed pools from arch_get_slow_rng_u64 at startup

Andy Lutomirski
2014-07-16T21:45:35Z

This should help solve the problem of guests starting out with
predictable RNG state.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
---
drivers/char/random.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0a7ac0a..17ad33d 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1261,6 +1261,13 @@ static void init_std_data(struct entropy_store *r)
mix_pool_bytes(r, &rv, sizeof(rv), NULL);
}
mix_pool_bytes(r, utsname(), sizeof(*(utsname())), NULL);
+
+ for (i = 0; i < 4; i++) {
+ u64 rv64;
+
+ if (arch_get_slow_rng_u64(&rv64))
+ mix_pool_bytes(r, &rv64, sizeof(rv64), NULL);
+ }
}

/*
--
1.9.3