From: Florian Westphal Date: Tue, 25 Jul 2017 22:02:34 +0000 (+0200) Subject: netfilter: nfnetlink_queue: don't queue dying conntracks to userspace X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5da773a3e81e6093c4346ee8cd356fc214d7c76c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Pablo Neira Ayuso --- diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 7c543bfbf624..c9796629858f 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -41,6 +41,10 @@ #include "../bridge/br_private.h" #endif +#if IS_ENABLED(CONFIG_NF_CONNTRACK) +#include +#endif + #define NFQNL_QMAX_DEFAULT 1024 /* We're using struct nlattr which has 16bit nla_len. Note that nla_len @@ -612,6 +616,18 @@ nlmsg_failure: return NULL; } +static bool nf_ct_drop_unconfirmed(const struct nf_queue_entry *entry) +{ +#if IS_ENABLED(CONFIG_NF_CONNTRACK) + static const unsigned long flags = IPS_CONFIRMED | IPS_DYING; + const struct nf_conn *ct = (void *)skb_nfct(entry->skb); + + if (ct && ((ct->status & flags) == IPS_DYING)) + return true; +#endif + return false; +} + static int __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, struct nf_queue_entry *entry) @@ -628,6 +644,9 @@ __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, } spin_lock_bh(&queue->lock); + if (nf_ct_drop_unconfirmed(entry)) + goto err_out_free_nskb; + if (queue->queue_total >= queue->queue_maxlen) { if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { failopen = 1;