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-rw-r--r--lib/random32.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/random32.c b/lib/random32.c
index 01e8890d1089..12215df701e8 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -142,6 +142,7 @@ void prandom_seed(u32 entropy)
for_each_possible_cpu (i) {
struct rnd_state *state = &per_cpu(net_rand_state, i);
state->s1 = __seed(state->s1 ^ entropy, 2);
+ prandom_u32_state(state);
}
}
EXPORT_SYMBOL(prandom_seed);
@@ -174,6 +175,27 @@ static int __init prandom_init(void)
}
core_initcall(prandom_init);
+static void __prandom_timer(unsigned long dontcare);
+static DEFINE_TIMER(seed_timer, __prandom_timer, 0, 0);
+
+static void __prandom_timer(unsigned long dontcare)
+{
+ u32 entropy;
+
+ get_random_bytes(&entropy, sizeof(entropy));
+ prandom_seed(entropy);
+ /* reseed every ~60 seconds, in [40 .. 80) interval with slack */
+ seed_timer.expires = jiffies + (40 * HZ + (prandom_u32() % (40 * HZ)));
+ add_timer(&seed_timer);
+}
+
+static void prandom_start_seed_timer(void)
+{
+ set_timer_slack(&seed_timer, HZ);
+ seed_timer.expires = jiffies + 40 * HZ;
+ add_timer(&seed_timer);
+}
+
/*
* Generate better values after random number generator
* is fully initialized.
@@ -194,6 +216,7 @@ static int __init prandom_reseed(void)
/* mix it in */
prandom_u32_state(state);
}
+ prandom_start_seed_timer();
return 0;
}
late_initcall(prandom_reseed);