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[177.4.161.87]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-131f968cad4sm5597146c88.6.2026.05.06.18.52.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 May 2026 18:52:24 -0700 (PDT) Message-ID: Date: Wed, 6 May 2026 22:52:18 -0300 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net] tipc: avoid sending zero-length stream messages To: Tung Quang Nguyen Cc: "netdev@vger.kernel.org" , "tipc-discussion@lists.sourceforge.net" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "syzbot+aa7d098bd6fa788fae8e@syzkaller.appspotmail.com" , Jon Maloy , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman References: <20260506-tipc-zero-length-stream-stall-v1-1-5d75f202227b@gmail.com> From: =?UTF-8?Q?C=C3=A1ssio_Gabriel_Monteiro_Pires?= Content-Language: en-US In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------qfmLxCCe833TR8Z2e3bOQoDx" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------qfmLxCCe833TR8Z2e3bOQoDx Content-Type: multipart/mixed; boundary="------------bY2qRkxssXquW0YwpYsfN4R1"; protected-headers="v1" From: =?UTF-8?Q?C=C3=A1ssio_Gabriel_Monteiro_Pires?= To: Tung Quang Nguyen Cc: "netdev@vger.kernel.org" , "tipc-discussion@lists.sourceforge.net" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "syzbot+aa7d098bd6fa788fae8e@syzkaller.appspotmail.com" , Jon Maloy , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Message-ID: Subject: Re: [PATCH net] tipc: avoid sending zero-length stream messages References: <20260506-tipc-zero-length-stream-stall-v1-1-5d75f202227b@gmail.com> In-Reply-To: --------------bY2qRkxssXquW0YwpYsfN4R1 Content-Type: multipart/mixed; boundary="------------d6PCoNGxfH9UhgBdD0GaQD4M" --------------d6PCoNGxfH9UhgBdD0GaQD4M Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi! On 5/6/26 03:41, Tung Quang Nguyen wrote: >> Subject: [PATCH net] tipc: avoid sending zero-length stream messages >> >> TIPC stream send currently enters the transmit loop even when the user= >> payload length is zero. This can build and transmit a header-only conn= ection >> message. >> >> For local TIPC sockets, such messages are delivered synchronously thro= ugh the >> loopback receive path. When this happens while socket backlog processi= ng is >> being flushed, reply transmission can re-enter TIPC receive processing= >> repeatedly and trigger an RCU stall. >> > Can you demonstrate this scenario using code ? It is better to point ou= t what current code is faulty. The minimized user-visible trigger is essentially: int fd[2]; struct msghdr msg =3D {}; socketpair(AF_TIPC, SOCK_STREAM, 0, fd); /* In parallel, this makes release_sock() flush backlog. */ setsockopt(fd[0], SOL_SOCKET, SO_ATTACH_BPF, &bad_fd, sizeof(bad_fd)); /* Repeated zero-length MSG_PROBE send on the connected peer. */ for (i =3D 0; i < 64; i++) sendmsg(fd[1], &msg, MSG_PROBE | MSG_MORE); The faulty current-code path is that TIPC stream send does not handle MSG_PROBE before entering __tipc_sendstream(). MSG_PROBE is supposed to probe without transmitting data, but the call reaches __tipc_sendstream()= with dlen =3D=3D 0. __tipc_sendstream() uses a do/while loop, so even when dlen is 0 the body= runs once: send =3D min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE); At that point send is 0, but the code can still call tipc_msg_append() or= tipc_msg_build(), creating a TIPC connection message with only the header= =2E It then calls: tipc_node_xmit(net, txq, dnode, tsk->portid); For a local TIPC socketpair, tipc_node_xmit() takes the in_own_node() pat= h and synchronously calls tipc_sk_rcv(). When this happens while release_sock() is processing backlog, the receive path can generate response traffic through tipc_node_distr_xmit(), which re-enters the same= local receive path. I should have made that explicit in the changelog and pointed at the missing MSG_PROBE handling as the faulty part. >> >> diff --git a/net/tipc/socket.c b/net/tipc/socket.c index >> 9329919fb07f..3c7838713d74 100644 >> --- a/net/tipc/socket.c >> +++ b/net/tipc/socket.c >> @@ -1585,6 +1585,8 @@ static int __tipc_sendstream(struct socket *sock= , >> struct msghdr *m, size_t dlen) >> tipc_sk_connected(sk))); >> if (unlikely(rc)) >> break; >> + if (unlikely(!dlen && sk->sk_type =3D=3D SOCK_STREAM)) >> + break; > This change is wrong. It immediately breaks normal connection set up be= cause the ACK (zero in length) has no chance to be sent back from the se= rver to the client. > Please try to test your patch before submission.=20 I did test the patch with the syzkaller C repro under QEMU for 10 minutes= , and it did not trigger the reported RCU stall: /tmp/repro & pid=3D$!; sleep 600; kill $pid dmesg | grep -Ei 'rcu.*stall|rcu_preempt|soft lockup|panic|BUG|WARN= ING' (attached) The dmesg check did not show any repro-triggered RCU stall, soft lockup, panic, BUG, or WARNING. But that test only covered the syzkaller trigger;= it did not cover normal active/passive TIPC stream connection setup, whic= h your review points out is broken by this version. I re-checked the TIPC connection setup path as well. tipc_accept() intentionally sends the server-side ACK as a zero-length stream message: iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0); __tipc_sendstream(new_sock, &m, 0); So blocking all zero-length sends inside __tipc_sendstream() prevents that ACK from being transmitted and can break normal SOCK_STREAM connection setup. After re-checking the syzkaller repro, the real trigger seems to be narro= wer than zero-length stream send. The repro uses a user sendmsg() with MSG_PROBE | MSG_MORE and no payload on an already connected TIPC stream socket. MSG_PROBE is supposed to probe without sending, but TIPC stream send currently lets that path reach __tipc_sendstream(), where the do/while body can still run once with dlen =3D=3D 0 and build/transmit a header-only message. I think we should avoid suppressing the internal __tipc_sendstream() ACK = path and instead handle the user-originated zero-length MSG_PROBE case before = it reaches the internal stream send helper. The v2 fix would look like this: -- 8< -- diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 9329919fb07f..4783df337971 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1542,6 +1542,10 @@ static int tipc_sendstream(struct socket *sock, st= ruct msghdr *m, size_t dsz) struct sock *sk =3D sock->sk; int ret; =20 + /* MSG_PROBE asks only to probe the path, not to transmit data. *= / + if (unlikely((m->msg_flags & MSG_PROBE) && !dsz)) + return 0; + lock_sock(sk); ret =3D __tipc_sendstream(sock, m, dsz); release_sock(sk); -- >8 -- I tested the reworked patch with the syzkaller C reproducer under QEMU. The reproducer was run for 10 minutes: /tmp/repro & pid=3D$!; sleep 600; kill $pid dmesg | grep -Ei 'rcu.*stall|rcu_preempt|soft lockup|panic|BUG|WARN= ING' (attached) The grep only matched boot-time command-line/debug messages; no repro-triggered RCU stall, soft lockup, panic, BUG, or WARNING appeared. 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