diff options
| author | Jiayuan Chen <mrpre@163.com> | 2024-12-29 00:44:15 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-09 13:23:33 +0100 |
| commit | 078f7e1521442a55db4bed812a2fbaf02ac33819 (patch) | |
| tree | 0479b48a86dd36a1e9ef5cc1610b16d28ca83d52 | |
| parent | ae8512e93f4ce47614ca89defaec1b93e00697b8 (diff) | |
| download | linux-078f7e1521442a55db4bed812a2fbaf02ac33819.tar.gz linux-078f7e1521442a55db4bed812a2fbaf02ac33819.tar.bz2 linux-078f7e1521442a55db4bed812a2fbaf02ac33819.zip | |
bpf: fix recursive lock when verdict program return SK_PASS
commit 8ca2a1eeadf09862190b2810697702d803ceef2d upstream.
When the stream_verdict program returns SK_PASS, it places the received skb
into its own receive queue, but a recursive lock eventually occurs, leading
to an operating system deadlock. This issue has been present since v6.9.
'''
sk_psock_strp_data_ready
write_lock_bh(&sk->sk_callback_lock)
strp_data_ready
strp_read_sock
read_sock -> tcp_read_sock
strp_recv
cb.rcv_msg -> sk_psock_strp_read
# now stream_verdict return SK_PASS without peer sock assign
__SK_PASS = sk_psock_map_verd(SK_PASS, NULL)
sk_psock_verdict_apply
sk_psock_skb_ingress_self
sk_psock_skb_ingress_enqueue
sk_psock_data_ready
read_lock_bh(&sk->sk_callback_lock) <= dead lock
'''
This topic has been discussed before, but it has not been fixed.
Previous discussion:
https://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch
Fixes: 6648e613226e ("bpf, skmsg: Fix NULL pointer dereference in sk_psock_skb_ingress_enqueue")
Reported-by: Vincent Whitchurch <vincent.whitchurch@datadoghq.com>
Signed-off-by: Jiayuan Chen <mrpre@163.com>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20241118030910.36230-2-mrpre@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[srish: Apply to stable branch linux-5.10.y]
Signed-off-by: Srish Srinivasan <srishwap4@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/core/skmsg.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/skmsg.c b/net/core/skmsg.c index a606ad8e8be2..dfc2e4d6a7a0 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -904,9 +904,9 @@ static void sk_psock_strp_data_ready(struct sock *sk) if (tls_sw_has_ctx_rx(sk)) { psock->parser.saved_data_ready(sk); } else { - write_lock_bh(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); strp_data_ready(&psock->parser.strp); - write_unlock_bh(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); } } rcu_read_unlock(); |