diff mbox series

[SRU,OEM-5.17,1/1] sch_sfb: Don't assume the skb is still around after enqueueing to child

Message ID 20230406010922.19313-2-cengiz.can@canonical.com
State New
Headers show
Series CVE-2022-3586 | expand

Commit Message

Cengiz Can April 6, 2023, 1:09 a.m. UTC 
From: Toke Høiland-Jørgensen <toke@toke.dk>

The sch_sfb enqueue() routine assumes the skb is still alive after it has
been enqueued into a child qdisc, using the data in the skb cb field in the
increment_qlen() routine after enqueue. However, the skb may in fact have
been freed, causing a use-after-free in this case. In particular, this
happens if sch_cake is used as a child of sfb, and the GSO splitting mode
of CAKE is enabled (in which case the skb will be split into segments and
the original skb freed).

Fix this by copying the sfb cb data to the stack before enqueueing the skb,
and using this stack copy in increment_qlen() instead of the skb pointer
itself.

Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-18231
Fixes: e13e02a3c68d ("net_sched: SFB flow scheduler")
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
CVE-2022-3586
(cherry picked from commit 9efd23297cca530bb35e1848665805d3fcdd7889)
Signed-off-by: Cengiz Can <cengiz.can@canonical.com>
---
 net/sched/sch_sfb.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index 3d061a13d7ed..0d761f454ae8 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -135,15 +135,15 @@  static void increment_one_qlen(u32 sfbhash, u32 slot, struct sfb_sched_data *q)
 	}
 }
 
-static void increment_qlen(const struct sk_buff *skb, struct sfb_sched_data *q)
+static void increment_qlen(const struct sfb_skb_cb *cb, struct sfb_sched_data *q)
 {
 	u32 sfbhash;
 
-	sfbhash = sfb_hash(skb, 0);
+	sfbhash = cb->hashes[0];
 	if (sfbhash)
 		increment_one_qlen(sfbhash, 0, q);
 
-	sfbhash = sfb_hash(skb, 1);
+	sfbhash = cb->hashes[1];
 	if (sfbhash)
 		increment_one_qlen(sfbhash, 1, q);
 }
@@ -283,6 +283,7 @@  static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 	struct sfb_sched_data *q = qdisc_priv(sch);
 	struct Qdisc *child = q->qdisc;
 	struct tcf_proto *fl;
+	struct sfb_skb_cb cb;
 	int i;
 	u32 p_min = ~0;
 	u32 minqlen = ~0;
@@ -399,11 +400,12 @@  static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 	}
 
 enqueue:
+	memcpy(&cb, sfb_skb_cb(skb), sizeof(cb));
 	ret = qdisc_enqueue(skb, child, to_free);
 	if (likely(ret == NET_XMIT_SUCCESS)) {
 		qdisc_qstats_backlog_inc(sch, skb);
 		sch->q.qlen++;
-		increment_qlen(skb, q);
+		increment_qlen(&cb, q);
 	} else if (net_xmit_drop_count(ret)) {
 		q->stats.childdrop++;
 		qdisc_qstats_drop(sch);