aboutsummaryrefslogtreecommitdiff
path: root/drivers/char/random.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char/random.c')
-rw-r--r--drivers/char/random.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index f824ef8a927..b2ced39d76b 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1665,15 +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;
}
/*