From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EC8F1DDF5; Tue, 16 Jul 2024 15:43:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721144604; cv=none; b=a6iCfrEywzJaN75bvDpRdqo1vtxtKYllBaFU7ngM4Ck2Y7x8ZtE8OD44KXYevh/T2qTEIbI7NRt3w1L4bMfWjVIfn86YyvpQ8VjSF0I9nzePUV7/B1FmqMNysA0bKnkRszxdoerzJRSFT8OyJXuUEvE71F/tXK12JitFyBp+CzA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721144604; c=relaxed/simple; bh=/t2FIKcjR/yeOHdQu2YmkdJ68f9ke2Zqgll74zA9aVc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YgLaRIWIBh2AQt/p63Itu7Zy69j88QuhJT/HCESOIFM3c1SE+Ka09G9bvkTvbkVLlzmryD7pq3TwT4bXcQl0TotzVOh6P2B98PHJMoNJP9XL7oPKTEVvLhQOUNbVoMOz3YqP8dsSrtuTF8b04ZWnRlnrmOsJYbjkTTaA3p1oouk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rvKc/1tw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rvKc/1tw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9A0FC116B1; Tue, 16 Jul 2024 15:43:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1721144604; bh=/t2FIKcjR/yeOHdQu2YmkdJ68f9ke2Zqgll74zA9aVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rvKc/1two6wibrGfj9p5X/m/dpWObUNwd8uNR+k2KDkYwFJcASyDZZ8H4Z4MsM+sa rkdH3N7DwDpB3zOkwjVzIJ0w9K7i1xKcPdI6evip5AOAuqXwYYYCl7J5+MVSC6n5WZ q1eHMKp12yV/d/DiIzxHsOUhPXaDAOhvsQXVzBd0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wang Yufen , Daniel Borkmann , Andrii Nakryiko , Jakub Sitnicki , John Fastabend , Wen Gu Subject: [PATCH 5.10 046/108] bpf, sockmap: Fix sk->sk_forward_alloc warn_on in sk_stream_kill_queues Date: Tue, 16 Jul 2024 17:31:01 +0200 Message-ID: <20240716152747.760086844@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240716152745.988603303@linuxfoundation.org> References: <20240716152745.988603303@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wang Yufen commit d8616ee2affcff37c5d315310da557a694a3303d upstream. During TCP sockmap redirect pressure test, the following warning is triggered: WARNING: CPU: 3 PID: 2145 at net/core/stream.c:205 sk_stream_kill_queues+0xbc/0xd0 CPU: 3 PID: 2145 Comm: iperf Kdump: loaded Tainted: G W 5.10.0+ #9 Call Trace: inet_csk_destroy_sock+0x55/0x110 inet_csk_listen_stop+0xbb/0x380 tcp_close+0x41b/0x480 inet_release+0x42/0x80 __sock_release+0x3d/0xa0 sock_close+0x11/0x20 __fput+0x9d/0x240 task_work_run+0x62/0x90 exit_to_user_mode_prepare+0x110/0x120 syscall_exit_to_user_mode+0x27/0x190 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The reason we observed is that: When the listener is closing, a connection may have completed the three-way handshake but not accepted, and the client has sent some packets. The child sks in accept queue release by inet_child_forget()->inet_csk_destroy_sock(), but psocks of child sks have not released. To fix, add sock_map_destroy to release psocks. Signed-off-by: Wang Yufen Signed-off-by: Daniel Borkmann Signed-off-by: Andrii Nakryiko Acked-by: Jakub Sitnicki Acked-by: John Fastabend Link: https://lore.kernel.org/bpf/20220524075311.649153-1-wangyufen@huawei.com [ Conflict in include/linux/bpf.h due to function declaration position and remove non-existed sk_psock_stop helper from sock_map_destroy. ] Signed-off-by: Wen Gu Signed-off-by: Greg Kroah-Hartman --- include/linux/bpf.h | 1 + include/linux/skmsg.h | 1 + net/core/skmsg.c | 1 + net/core/sock_map.c | 22 ++++++++++++++++++++++ net/ipv4/tcp_bpf.c | 1 + 5 files changed, 26 insertions(+) --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1800,6 +1800,7 @@ int sock_map_get_from_fd(const union bpf int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); void sock_map_unhash(struct sock *sk); +void sock_map_destroy(struct sock *sk); void sock_map_close(struct sock *sk, long timeout); #else static inline int sock_map_prog_update(struct bpf_map *map, --- a/include/linux/skmsg.h +++ b/include/linux/skmsg.h @@ -98,6 +98,7 @@ struct sk_psock { spinlock_t link_lock; refcount_t refcnt; void (*saved_unhash)(struct sock *sk); + void (*saved_destroy)(struct sock *sk); void (*saved_close)(struct sock *sk, long timeout); void (*saved_write_space)(struct sock *sk); struct proto *sk_proto; --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -599,6 +599,7 @@ struct sk_psock *sk_psock_init(struct so psock->eval = __SK_NONE; psock->sk_proto = prot; psock->saved_unhash = prot->unhash; + psock->saved_destroy = prot->destroy; psock->saved_close = prot->close; psock->saved_write_space = sk->sk_write_space; --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -1566,6 +1566,28 @@ void sock_map_unhash(struct sock *sk) saved_unhash(sk); } +void sock_map_destroy(struct sock *sk) +{ + void (*saved_destroy)(struct sock *sk); + struct sk_psock *psock; + + rcu_read_lock(); + psock = sk_psock_get(sk); + if (unlikely(!psock)) { + rcu_read_unlock(); + if (sk->sk_prot->destroy) + sk->sk_prot->destroy(sk); + return; + } + + saved_destroy = psock->saved_destroy; + sock_map_remove_links(sk, psock); + rcu_read_unlock(); + sk_psock_put(sk, psock); + saved_destroy(sk); +} +EXPORT_SYMBOL_GPL(sock_map_destroy); + void sock_map_close(struct sock *sk, long timeout) { void (*saved_close)(struct sock *sk, long timeout); --- a/net/ipv4/tcp_bpf.c +++ b/net/ipv4/tcp_bpf.c @@ -582,6 +582,7 @@ static void tcp_bpf_rebuild_protos(struc struct proto *base) { prot[TCP_BPF_BASE] = *base; + prot[TCP_BPF_BASE].destroy = sock_map_destroy; prot[TCP_BPF_BASE].close = sock_map_close; prot[TCP_BPF_BASE].recvmsg = tcp_bpf_recvmsg; prot[TCP_BPF_BASE].stream_memory_read = tcp_bpf_stream_read;