This is a note to let you know that I've just added the patch titled netfilter: nftables: Do not run chains in the wrong network namespace to the 4.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: netfilter-nftables-do-not-run-chains-in-the-wrong-network-namespace.patch and it can be found in the queue-4.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From fdab6a4cbd8933092155449ca7253eba973ada14 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Date: Fri, 19 Jun 2015 10:41:21 -0500 Subject: netfilter: nftables: Do not run chains in the wrong network namespace From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> commit fdab6a4cbd8933092155449ca7253eba973ada14 upstream. Currenlty nf_tables chains added in one network namespace are being run in all network namespace. The issues are myriad with the simplest being an unprivileged user can cause any network packets to be dropped. Address this by simply not running nf_tables chains in the wrong network namespace. Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Acked-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/netfilter/nf_tables_core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/netfilter/nf_tables_core.c +++ b/net/netfilter/nf_tables_core.c @@ -114,7 +114,8 @@ unsigned int nft_do_chain(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops) { const struct nft_chain *chain = ops->priv, *basechain = chain; - const struct net *net = read_pnet(&nft_base_chain(basechain)->pnet); + const struct net *chain_net = read_pnet(&nft_base_chain(basechain)->pnet); + const struct net *net = dev_net(pkt->in ? pkt->in : pkt->out); const struct nft_rule *rule; const struct nft_expr *expr, *last; struct nft_regs regs; @@ -124,6 +125,10 @@ nft_do_chain(struct nft_pktinfo *pkt, co int rulenum; unsigned int gencursor = nft_genmask_cur(net); + /* Ignore chains that are not for the current network namespace */ + if (!net_eq(net, chain_net)) + return NF_ACCEPT; + do_chain: rulenum = 0; rule = list_entry(&chain->rules, struct nft_rule, list); Patches currently in stable-queue which might be from ebiederm@xxxxxxxxxxxx are queue-4.1/netfilter-nftables-do-not-run-chains-in-the-wrong-network-namespace.patch queue-4.1/netfilter-nf_qeueue-drop-queue-entries-on-nf_unregister_hook.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html