1 files changed, 19 insertions, 9 deletions

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 7c13581ca9cd..b2ced39d76b2 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -241,6 +241,10 @@
 #include <linux/percpu.h>
 #include <linux/cryptohash.h>
 
+#ifdef CONFIG_GENERIC_HARDIRQS
+# include <linux/irq.h>
+#endif
+
 #include <asm/processor.h>
 #include <asm/uaccess.h>
 #include <asm/irq.h>
@@ -558,7 +562,7 @@ struct timer_rand_state {
         unsigned dont_count_entropy:1;
 };
 
-#ifndef CONFIG_SPARSE_IRQ
+#ifndef CONFIG_GENERIC_HARDIRQS
 
 static struct timer_rand_state *irq_timer_state[NR_IRQS];
 
@@ -1484,7 +1488,8 @@ static void rekey_seq_generator(struct work_struct *work)
         keyptr->count = (ip_cnt & COUNT_MASK) << HASH_BITS;
         smp_wmb();
         ip_cnt++;
-        schedule_delayed_work(&rekey_work, REKEY_INTERVAL);
+        schedule_delayed_work(&rekey_work,
+                              round_jiffies_relative(REKEY_INTERVAL));
 }
 
 static inline struct keydata *get_keyptr(void)
@@ -1660,15 +1665,20 @@ EXPORT_SYMBOL(secure_dccp_sequence_number);
  * value is not cryptographically secure but for several uses the cost of
  * depleting entropy is too high
  */
+DEFINE_PER_CPU(__u32 [4], get_random_int_hash);
 unsigned int get_random_int(void)
 {
-        /*
-         * Use IP's RNG. It suits our purpose perfectly: it re-keys itself
-         * every second, from the entropy pool (and thus creates a limited
-         * drain on it), and uses halfMD4Transform within the second. We
-         * also mix it with jiffies and the PID:
-         */
-        return secure_ip_id((__force __be32)(current->pid + jiffies));
+        struct keydata *keyptr;
+        __u32 *hash = get_cpu_var(get_random_int_hash);
+        int ret;
+
+        keyptr = get_keyptr();
+        hash[0] += current->pid + jiffies + get_cycles() + (int)(long)&ret;
+
+        ret = half_md4_transform(hash, keyptr->secret);
+        put_cpu_var(get_random_int_hash);
+
+        return ret;
 }
 
 /*