net: sched: protect against stack overflow in TC act_mirred (e2ca070f) · Commits · 戴 / test

TC hooks allow the application of filters and actions to packets at both ingress and egress of the network stack. It is possible, with poor configuration, that this can produce loops whereby an ingress hook calls a mirred egress action that has an egress hook that redirects back to the first ingress etc. The TC core classifier protects against loops when doing reclassifies but there is no protection against a packet looping between multiple hooks and recursively calling act_mirred. This can lead to stack overflow panics. Add a per CPU counter to act_mirred that is incremented for each recursive call of the action function when processing a packet. If a limit is passed then the packet is dropped and CPU counter reset. Note that this patch does not protect against loops in TC datapaths. Its aim is to prevent stack overflow kernel panics that can be a consequence of such loops. Signed-off-by:

John Hurley <john.hurley@netronome.com> Reviewed-by:

Simon Horman <simon.horman@netronome.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/sched/act_mirred.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,9 @@
		static LIST_HEAD(mirred_list);
		static DEFINE_SPINLOCK(mirred_list_lock);

		#define MIRRED_RECURSION_LIMIT 4
		static DEFINE_PER_CPU(unsigned int, mirred_rec_level);

		static bool tcf_mirred_is_act_redirect(int action)
		{
		return action == TCA_EGRESS_REDIR \|\| action == TCA_INGRESS_REDIR;
		@@ -210,6 +213,7 @@ static int tcf_mirred_act(struct sk_buff skb, const struct tc_action a,
		struct sk_buff *skb2 = skb;
		bool m_mac_header_xmit;
		struct net_device *dev;
		unsigned int rec_level;
		int retval, err = 0;
		bool use_reinsert;
		bool want_ingress;
		@@ -217,6 +221,14 @@ static int tcf_mirred_act(struct sk_buff skb, const struct tc_action a,
		int m_eaction;
		int mac_len;

		rec_level = __this_cpu_inc_return(mirred_rec_level);
		if (unlikely(rec_level > MIRRED_RECURSION_LIMIT)) {
		net_warn_ratelimited("Packet exceeded mirred recursion limit on dev %s\n",
		netdev_name(skb->dev));
		__this_cpu_dec(mirred_rec_level);
		return TC_ACT_SHOT;
		}

		tcf_lastuse_update(&m->tcf_tm);
		bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);

		@@ -278,6 +290,7 @@ static int tcf_mirred_act(struct sk_buff skb, const struct tc_action a,
		res->ingress = want_ingress;
		res->qstats = this_cpu_ptr(m->common.cpu_qstats);
		skb_tc_reinsert(skb, res);
		__this_cpu_dec(mirred_rec_level);
		return TC_ACT_CONSUMED;
		}
		}
		@@ -293,6 +306,7 @@ out:
		if (tcf_mirred_is_act_redirect(m_eaction))
		retval = TC_ACT_SHOT;
		}
		__this_cpu_dec(mirred_rec_level);

		return retval;
		}

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