diff options
| -rw-r--r-- | src/peerlookup.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/peerlookup.c b/src/peerlookup.c index e4deb33..8144284 100644 --- a/src/peerlookup.c +++ b/src/peerlookup.c @@ -120,6 +120,7 @@ __le32 wg_index_hashtable_insert(struct index_hashtable *table, struct index_hashtable_entry *entry) { struct index_hashtable_entry *existing_entry; + unsigned int tries = 0; spin_lock_bh(&table->lock); hlist_del_init_rcu(&entry->index_hash); @@ -129,7 +130,10 @@ __le32 wg_index_hashtable_insert(struct index_hashtable *table, search_unused_slot: /* First we try to find an unused slot, randomly, while unlocked. */ - entry->index = (__force __le32)get_random_u32(); + if (++tries > 32) /* Work around AMD Ryzen 3000 RDRAND bug. */ + get_random_bytes(&entry->index, sizeof(entry->index)); + else + entry->index = (__force __le32)get_random_u32(); hlist_for_each_entry_rcu_bh(existing_entry, index_bucket(table, entry->index), index_hash) { |