[PATCH v4 09/13] rhashtable: use get_random_u32 for hash_rnd

From: Jason A. Donenfeld
Date: Tue Jun 06 2017 - 13:49:44 EST


This is much faster and just as secure. It also has the added benefit of
probably returning better randomness at early-boot on systems with
architectural RNGs.

Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Cc: Thomas Graf <tgraf@xxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
lib/rhashtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index d9e7274a04cd..a1eb7c947f46 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -235,7 +235,7 @@ static struct bucket_table *bucket_table_alloc(struct rhashtable *ht,

INIT_LIST_HEAD(&tbl->walkers);

- get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd));
+ tbl->hash_rnd = get_random_u32();

for (i = 0; i < nbuckets; i++)
INIT_RHT_NULLS_HEAD(tbl->buckets[i], ht, i);
--
2.13.0