netdev - [PATCH] net: fold network name hash

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20091027102251.244ee681@nehalam>
Date:	Tue, 27 Oct 2009 10:22:51 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	eric.dumazet@...il.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, opurdila@...acom.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: [PATCH] net: fold network name hash

The full_name_hash does not produce a value that is evenly distributed
over the lower 8 bits. This causes name hash to be unbalanced with large
number of names.  A simple fix is to just fold in the higher bits
with XOR.

This is independent of possible improvements to full_name_hash()
in future.

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>


--- a/net/core/dev.c	2009-10-27 09:21:46.127252547 -0700
+++ b/net/core/dev.c	2009-10-27 09:25:14.593313378 -0700
@@ -199,7 +199,11 @@ EXPORT_SYMBOL(dev_base_lock);
 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
 {
 	unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
-	return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
+
+	hash ^= (hash >> NETDEV_HASHBITS);
+	hash &= NETDEV_HASHENTRIES - 1;
+
+	return &net->dev_name_head[hash];
 }
 
 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html