netdev - [PATCH net 0/2] net/sched: Fix race conditions in mini_qdisc_pair

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Date: Sat, 10 Jun 2023 20:29:41 -0700
From: Peilin Ye <yepeilin.cs@...il.com>
To: Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Peilin Ye <peilin.ye@...edance.com>,
	Vlad Buslov <vladbu@...lanox.com>,
	Pedro Tammela <pctammela@...atatu.com>,
	John Fastabend <john.fastabend@...il.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Hillf Danton <hdanton@...a.com>,
	Zhengchao Shao <shaozhengchao@...wei.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cong Wang <cong.wang@...edance.com>,
	Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net 0/2] net/sched: Fix race conditions in mini_qdisc_pair_swap()

Hi all,

These 2 patches fix race conditions for ingress and clsact Qdiscs as
reported [1] by syzbot, split out from another [2] series (last 2 patches
of it).  Per-patch changelog omitted.

Patch 1 hasn't been touched since last version; I just included
everybody's tag.

Patch 2 bases on patch 6 v1 of [2], with comments and commit log slightly
changed.  We also need rtnl_dereference() to load ->qdisc_sleeping since
commit d636fc5dd692 ("net: sched: add rcu annotations around
qdisc->qdisc_sleeping"), so I changed that; please take yet another look,
thanks!

Patch 2 has been tested with the new reproducer Pedro posted [3].

[1] https://syzkaller.appspot.com/bug?extid=b53a9c0d1ea4ad62da8b
[2] https://lore.kernel.org/r/cover.1684887977.git.peilin.ye@bytedance.com/
[3] https://lore.kernel.org/r/7879f218-c712-e9cc-57ba-665990f5f4c9@mojatatu.com/

Thanks,
Peilin Ye (2):
  net/sched: Refactor qdisc_graft() for ingress and clsact Qdiscs
  net/sched: qdisc_destroy() old ingress and clsact Qdiscs before
    grafting

 include/net/sch_generic.h |  8 +++++++
 net/sched/sch_api.c       | 44 +++++++++++++++++++++++++++------------
 net/sched/sch_generic.c   | 14 ++++++++++---
 3 files changed, 50 insertions(+), 16 deletions(-)

-- 
2.20.1