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[NETFILTER]: nfnetlink_log: fix EPERM when binding/unbinding and instance 0 exists

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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 <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-03-10 16:44:13 -07:00 committed by David S. Miller
parent 019f692ea7
commit b7047a1c88
1 changed files with 16 additions and 14 deletions
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30
net/netfilter/nfnetlink_log.c
View file

@ -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;