netdev - netfilter 02/12: nf_conntrack: use hlist_add_head_rcu() in nf_conntrack_set

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20090326190227.23365.25636.sendpatchset@x2.localnet>
Date:	Thu, 26 Mar 2009 20:02:33 +0100 (MET)
From:	Patrick McHardy <kaber@...sh.net>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	netfilter-devel@...r.kernel.org
Subject: netfilter 02/12: nf_conntrack: use hlist_add_head_rcu() in nf_conntrack_set_hashsize()

commit 78f3648601fdc7a8166748bbd6d0555a88efa24a
Author: Eric Dumazet <dada1@...mosbay.com>
Date:   Wed Mar 25 17:24:34 2009 +0100

    netfilter: nf_conntrack: use hlist_add_head_rcu() in nf_conntrack_set_hashsize()
    
    Using hlist_add_head() in nf_conntrack_set_hashsize() is quite dangerous.
    Without any barrier, one CPU could see a loop while doing its lookup.
    Its true new table cannot be seen by another cpu, but previous table is still
    readable.
    
    Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
    Signed-off-by: Patrick McHardy <kaber@...sh.net>

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 55befe5..54e983f 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1121,7 +1121,7 @@ int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 					struct nf_conntrack_tuple_hash, hnode);
 			hlist_del_rcu(&h->hnode);
 			bucket = __hash_conntrack(&h->tuple, hashsize, rnd);
-			hlist_add_head(&h->hnode, &hash[bucket]);
+			hlist_add_head_rcu(&h->hnode, &hash[bucket]);
 		}
 	}
 	old_size = nf_conntrack_htable_size;
--
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