From b7047a1c886386b10a103b4fea26678db8b57832 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Mon, 10 Mar 2008 16:44:13 -0700 Subject: [PATCH] [NETFILTER]: nfnetlink_log: fix EPERM when binding/unbinding and instance 0 exists When binding or unbinding to an address family, the res_id is usually set to zero. When logging instance 0 already exists and is owned by a different process, this makes nfunl_recv_config return -EPERM without performing the bind operation. Since no operation on the foreign logging instance itself was requested, this is incorrect. Move bind/unbind commands before the queue instance permissions checks. Also remove an incorrect comment. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/nfnetlink_log.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index c6802c0d6e..bf3f19b21f 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -702,20 +702,30 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); u_int16_t group_num = ntohs(nfmsg->res_id); struct nfulnl_instance *inst; + struct nfulnl_msg_config_cmd *cmd = NULL; int ret = 0; + if (nfula[NFULA_CFG_CMD]) { + u_int8_t pf = nfmsg->nfgen_family; + cmd = nla_data(nfula[NFULA_CFG_CMD]); + + /* Commands without queue context */ + switch (cmd->command) { + case NFULNL_CFG_CMD_PF_BIND: + return nf_log_register(pf, &nfulnl_logger); + case NFULNL_CFG_CMD_PF_UNBIND: + nf_log_unregister_pf(pf); + return 0; + } + } + inst = instance_lookup_get(group_num); if (inst && inst->peer_pid != NETLINK_CB(skb).pid) { ret = -EPERM; goto out_put; } - if (nfula[NFULA_CFG_CMD]) { - u_int8_t pf = nfmsg->nfgen_family; - struct nfulnl_msg_config_cmd *cmd; - - cmd = nla_data(nfula[NFULA_CFG_CMD]); - + if (cmd != NULL) { switch (cmd->command) { case NFULNL_CFG_CMD_BIND: if (inst) { @@ -738,14 +748,6 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb, instance_destroy(inst); goto out; - case NFULNL_CFG_CMD_PF_BIND: - ret = nf_log_register(pf, &nfulnl_logger); - break; - case NFULNL_CFG_CMD_PF_UNBIND: - /* This is a bug and a feature. We cannot unregister - * other handlers, like nfnetlink_inst can */ - nf_log_unregister_pf(pf); - break; default: ret = -ENOTSUPP; break; -- 2.39.5