random32: add prandom_reseed_late() and call when nonblocking pool becomes initialized

[~andy/linux] / drivers / char / random.c

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 7737b5bd26af816e4361a906ad9d0cd6966b7287..4fe5609eeb72beb69e31ed1e7832585eafe0c591 100644 (file)
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -603,8 +603,11 @@ retry:
 
        if (!r->initialized && nbits > 0) {
                r->entropy_total += nbits;
-               if (r->entropy_total > 128)
+               if (r->entropy_total > 128) {
                        r->initialized = 1;
+                       if (r == &nonblocking_pool)
+                               prandom_reseed_late();
+               }
        }
 
        trace_credit_entropy_bits(r->name, nbits, entropy_count,
@@ -640,7 +643,7 @@ struct timer_rand_state {
  */
 void add_device_randomness(const void *buf, unsigned int size)
 {
-       unsigned long time = get_cycles() ^ jiffies;
+       unsigned long time = random_get_entropy() ^ jiffies;
 
        mix_pool_bytes(&input_pool, buf, size, NULL);
        mix_pool_bytes(&input_pool, &time, sizeof(time), NULL);
@@ -677,7 +680,7 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num)
                goto out;
 
        sample.jiffies = jiffies;
-       sample.cycles = get_cycles();
+       sample.cycles = random_get_entropy();
        sample.num = num;
        mix_pool_bytes(&input_pool, &sample, sizeof(sample), NULL);
 
@@ -744,7 +747,7 @@ void add_interrupt_randomness(int irq, int irq_flags)
        struct fast_pool        *fast_pool = &__get_cpu_var(irq_randomness);
        struct pt_regs          *regs = get_irq_regs();
        unsigned long           now = jiffies;
-       __u32                   input[4], cycles = get_cycles();
+       __u32                   input[4], cycles = random_get_entropy();
 
        input[0] = cycles ^ jiffies;
        input[1] = irq;
@@ -1459,12 +1462,11 @@ struct ctl_table random_table[] = {
 
 static u32 random_int_secret[MD5_MESSAGE_BYTES / 4] ____cacheline_aligned;
 
-static int __init random_int_secret_init(void)
+int random_int_secret_init(void)
 {
        get_random_bytes(random_int_secret, sizeof(random_int_secret));
        return 0;
 }
-late_initcall(random_int_secret_init);
 
 /*
  * Get a random word for internal kernel use only. Similar to urandom but
@@ -1483,7 +1485,7 @@ unsigned int get_random_int(void)
 
        hash = get_cpu_var(get_random_int_hash);
 
-       hash[0] += current->pid + jiffies + get_cycles();
+       hash[0] += current->pid + jiffies + random_get_entropy();
        md5_transform(hash, random_int_secret);
        ret = hash[0];
        put_cpu_var(get_random_int_hash);