netfilter: nfnetlink_queue: don't queue dying conntracks to userspace
When skb is queued to userspace it leaves softirq/rcu protection.
skb->nfct (via conntrack extensions such as helper) could then reference
modules that no longer exist if the conntrack was not yet confirmed.
nf_ct_iterate_destroy() will set the DYING bit for unconfirmed
conntracks, we therefore solve this race as follows:
1. take the queue spinlock.
2. check if the conntrack is unconfirmed and has dying bit set.
In this case, we must discard skb while we're still inside
rcu read-side section.
3. If nf_ct_iterate_destroy() is called right after the packet is queued
to userspace, it will be removed from the queue via
nf_ct_iterate_destroy -> nf_queue_nf_hook_drop.
When userspace sends the verdict (nfnetlink takes rcu read lock), there
are two cases to consider:
1. nf_ct_iterate_destroy() was called while packet was out.
In this case, skb will have been removed from the queue already
and no reinject takes place as we won't find a matching entry for the
packet id.
2. nf_ct_iterate_destroy() gets called right after verdict callback
found and removed the skb from queue list.
In this case, skb->nfct is marked as dying but it is still valid.
The skb will be dropped either in nf_conntrack_confirm (we don't
insert DYING conntracks into hash table) or when we try to queue
the skb again, but either events don't occur before the rcu read lock
is dropped.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 file changed
