linux-kernel - [PATCH v2 3/5] random: Seed pools from arch_get_slow_rng

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Message-Id: <c2750e64d318e44bca34ae792edc976e0e6990eb.1405532533.git.luto@amacapital.net>
Date:	Wed, 16 Jul 2014 10:45:58 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	kvm@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Theodore Ts'o <tytso@....edu>, linux-kernel@...r.kernel.org,
	Kees Cook <keescook@...omium.org>, x86@...nel.org
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v2 3/5] random: Seed pools from arch_get_slow_rng_u64 at startup

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

Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 drivers/char/random.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0a7ac0a..e2c3d02 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1261,6 +1261,14 @@ 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

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