netdev - [PATCH 5.10 2/3] net/sched: act_mirred: better wording on protection against excessive stack growth

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Message-Id: <20230516190040.636627-3-dragos.panait@windriver.com>
Date: Tue, 16 May 2023 22:00:39 +0300
From: Dragos-Marian Panait <dragos.panait@...driver.com>
To: stable@...r.kernel.org
Cc: wenxu <wenxu@...oud.cn>, Jakub Kicinski <kuba@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Davide Caratti <dcaratti@...hat.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Paolo Abeni <pabeni@...hat.com>, William Zhao <wizhao@...hat.com>,
        Xin Long <lucien.xin@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH 5.10 2/3] net/sched: act_mirred: better wording on protection against excessive stack growth

From: Davide Caratti <dcaratti@...hat.com>

[ Upstream commit 78dcdffe0418ac8f3f057f26fe71ccf4d8ed851f ]

with commit e2ca070f89ec ("net: sched: protect against stack overflow in
TC act_mirred"), act_mirred protected itself against excessive stack growth
using per_cpu counter of nested calls to tcf_mirred_act(), and capping it
to MIRRED_RECURSION_LIMIT. However, such protection does not detect
recursion/loops in case the packet is enqueued to the backlog (for example,
when the mirred target device has RPS or skb timestamping enabled). Change
the wording from "recursion" to "nesting" to make it more clear to readers.

CC: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Davide Caratti <dcaratti@...hat.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Stable-dep-of: ca22da2fbd69 ("act_mirred: use the backlog for nested calls to mirred ingress")
Signed-off-by: Dragos-Marian Panait <dragos.panait@...driver.com>
---
 net/sched/act_mirred.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 53594b0466eb..01a44c3e8d6d 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -28,8 +28,8 @@
 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);
+#define MIRRED_NEST_LIMIT    4
+static DEFINE_PER_CPU(unsigned int, mirred_nest_level);
 
 static bool tcf_mirred_is_act_redirect(int action)
 {
@@ -225,7 +225,7 @@ 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;
+	unsigned int nest_level;
 	int retval, err = 0;
 	bool use_reinsert;
 	bool want_ingress;
@@ -236,11 +236,11 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
 	int mac_len;
 	bool at_nh;
 
-	rec_level = __this_cpu_inc_return(mirred_rec_level);
-	if (unlikely(rec_level > MIRRED_RECURSION_LIMIT)) {
+	nest_level = __this_cpu_inc_return(mirred_nest_level);
+	if (unlikely(nest_level > MIRRED_NEST_LIMIT)) {
 		net_warn_ratelimited("Packet exceeded mirred recursion limit on dev %s\n",
 				     netdev_name(skb->dev));
-		__this_cpu_dec(mirred_rec_level);
+		__this_cpu_dec(mirred_nest_level);
 		return TC_ACT_SHOT;
 	}
 
@@ -310,7 +310,7 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
 			err = tcf_mirred_forward(res->ingress, skb);
 			if (err)
 				tcf_action_inc_overlimit_qstats(&m->common);
-			__this_cpu_dec(mirred_rec_level);
+			__this_cpu_dec(mirred_nest_level);
 			return TC_ACT_CONSUMED;
 		}
 	}
@@ -322,7 +322,7 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
 		if (tcf_mirred_is_act_redirect(m_eaction))
 			retval = TC_ACT_SHOT;
 	}
-	__this_cpu_dec(mirred_rec_level);
+	__this_cpu_dec(mirred_nest_level);
 
 	return retval;
 }
-- 
2.40.1