netdev - [PATCH net-next v1 0/3] net: Avoid ehash lookup races

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Message-Id: <20250915070308.111816-1-xuanqiang.luo@linux.dev>
Date: Mon, 15 Sep 2025 15:03:05 +0800
From: xuanqiang.luo@...ux.dev
To: edumazet@...gle.com,
	kuniyu@...gle.com
Cc: kerneljasonxing@...il.com,
	davem@...emloft.net,
	kuba@...nel.org,
	netdev@...r.kernel.org,
	Xuanqiang Luo <luoxuanqiang@...inos.cn>
Subject: [PATCH net-next v1 0/3] net: Avoid ehash lookup races 

From: Xuanqiang Luo <luoxuanqiang@...inos.cn>

After replacing R/W locks with RCU in commit 3ab5aee7fe84 ("net: Convert
TCP & DCCP hash tables to use RCU / hlist_nulls"), a race window emerged
during the switch from reqsk/sk to sk/tw.

Now that both timewait sock (tw) and full sock (sk) reside on the same ehash
chain, it is appropriate to introduce hlist_nulls replace operations, to
eliminate the race conditions caused by this window.

Xuanqiang Luo (3):
  rculist: Add __hlist_nulls_replace_rcu() and
    hlist_nulls_replace_init_rcu()
  inet: Avoid ehash lookup race in inet_ehash_insert()
  inet: Avoid ehash lookup race in inet_twsk_hashdance_schedule()

 include/linux/rculist_nulls.h | 62 +++++++++++++++++++++++++++++++++++
 include/net/sock.h            | 23 +++++++++++++
 net/ipv4/inet_hashtables.c    |  7 ++++
 net/ipv4/inet_timewait_sock.c | 20 ++++++-----
 4 files changed, 103 insertions(+), 9 deletions(-)

-- 
2.27.0