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Mon, 17 Mar 2025 14:05:49 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas2p1.samsung.com (KnoxPortal) with ESMTPA id 20250317050548epcas2p158c1bfcef5059e51afeab70680da5e5d~tfrWGXQUT0060500605epcas2p1M; Mon, 17 Mar 2025 05:05:48 +0000 (GMT) Received: from epsmgmcp1.samsung.com (unknown [182.195.42.82]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20250317050548epsmtrp10fa2c41dbd599bb5b5634ea10eebe0c4~tfrWFCWlq0320703207epsmtrp1P; Mon, 17 Mar 2025 05:05:48 +0000 (GMT) X-AuditID: b6c32a46-484397000000564e-a9-67d7adadf39d Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgmcp1.samsung.com (Symantec Messaging Gateway) with SMTP id 34.81.33707.CADA7D76; Mon, 17 Mar 2025 14:05:48 +0900 (KST) Received: from perf.dsn.sec.samsung.com (unknown [10.229.95.91]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250317050548epsmtip10c6198c273b0feac956ff180a737f2fd~tfrVyzbuE2597525975epsmtip1j; Mon, 17 Mar 2025 05:05:48 +0000 (GMT) From: Youngmin Nam To: stable@vger.kernel.org Cc: ncardwell@google.com, edumazet@google.com, kuba@kernel.org, davem@davemloft.net, dsahern@kernel.org, pabeni@redhat.com, horms@kernel.org, guo88.liu@samsung.com, yiwang.cai@samsung.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, joonki.min@samsung.com, hajun.sung@samsung.com, d7271.choe@samsung.com, sw.ju@samsung.com, dujeong.lee@samsung.com, ycheng@google.com, yyd@google.com, kuro@kuroa.me, youngmin.nam@samsung.com, cmllamas@google.com, willdeacon@google.com, maennich@google.com, gregkh@google.com, lorenzo@google.com, kerneljasonxing@gmail.com Subject: [PATCH v2 stable 5.15 1/2] tcp: fix races in tcp_abort() Date: Mon, 17 Mar 2025 14:09:49 +0900 Message-Id: <20250317050950.2351143-1-youngmin.nam@samsung.com> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01Te0xTVxzO6b32Xpks1/roSfeQXPbiaQsUjkzURYI3wyyMZUtkmayhd4XR 13qLmY8o4Q0yHoIOCmZFpmNkPKy1AzoGAQWROVQElGmYIEUUUKBCIKIrLTr/+873+77z+37n QWKCSb6ITFDrWZ1apqT5bril3SvYr6ZmQCE+2Ugje+t1AvU3FxKovCcNR7VN6TxkM5bgaLRj mEC2uQUMFRUDlNJyHUPD+Zf4qM86hSGr5UcCXbXkrUJt7WME6m0q56O67imA5ponCJR1uxlH HcaNaK57AiDj2WGA0kdmCZS58BBH9pE+PpruTCFQZesMgVIravEdbzDmX2/xmEbDHYIxmpIY U3U2nzHmEcyjP/v4TJ65GjCzprejyJjErfGsTM7qPFh1nEaeoFaE0ZGfxe6MlQaLJX6SLSiE 9lDLVGwYHb47yi8iQemYmvbYJ1MmOagoGcfRm7dt1WmS9KxHvIbTh9GsVq7Uhmj9OZmKS1Ir /NWsPlQiFgdIHcKvE+P/6ioD2vw139+3lxPJ4KRbDlhNQioItphu4DnAjRRQDQD2/j1IuBYz AI7eMOIvF72ZVvyFxTzSgbkKjQD2P69ZsTwB8ObPdmxZxaf8oOXSM5ADSHI9JYJDfR8uazDq Ag67f5skljXrqI/g1KnfnRqcehc+sguWaXdqO6zoWcSWaUhtgpX/Qhe9FnaV3nNmwBx06vky ZwZITZDQWmdY5QoXDs9bjvNdeB180GkmXFgEx/MzVjAHk4cGV8xpAF4euI+5CoHQYMt05sEo L1jXtNmVwRNeGFzp+zrMal8iXLQ7zMoQuIzvwcXieuDCb0JrZdXKhgxcPHHT2VVAfQWnFwt4 BWCT4ZVpDK9MY/i/rxFg1WAjq+VUCpYL0Aa8vNM4jcoEnO/eO6IBFE8+9m8DPBK0AUhi9Hr3 /FMDCoG7XLb/AKvTxOqSlCzXBqSO0y3ERBviNI6Po9bHSoK2iIOCgyUhAVJxCC10P9iQphBQ CpmeTWRZLat74eORq0XJvLIvvBYOC5cOibG0Dy6WBd/Oybvm+xbbqjytao1+HiqUTviky1vu gMtTQcdNZxbG5jq+kz61SfoPFv4yLV/rR5yrOnPr6bncDfXfHIk5IGf6AuP2e+uJu7x021hB yT/+D0L3HJv3OTTFWYQfZweBGPPVZ55HD/sqh/a9VjRSFam+J/H58tPaVv7nuUbPlLp6/592 F0ePZuTc7apL+CNjj+1JQmiZvTR3F39sV80EWfEwav7YrMgaIVPQwoGS05bICJZ5J/WIoOfb 3CvvNzF7xz8pDQwQ7hi6lt0U/UPGZJV2b1xYhaDEPN45/3hNwUXj2Q5f/ZW07TN5WDgv+miR tnHn0jYa5+JlEm9Mx8n+A67KA+eABAAA X-Brightmail-Tracker: H4sIAAAAAAAAA02Ra0hTYQCG/XbOdk4r6zStPiyMVoFEmrfyy6K0Qo5FNyuK7OLIw7S2pWca Jmiat1w5DYtybbEpSA1daV5SU+cML5ho6pQssTRnlpfMJSkVNS3w38vzPP9eEhPcx53IcFkU w8pEEiGPj5fVC51dCwp7xO5fh7yQ1dhBoO7q2wRStyXjyFCZwkEW7X0cDTUMEMgyPYOh7DsA Xa/twNBAZhMPmavGMVRVdo9A7WVKLjLVDxOos1LNQ09axgGarh4l0I131Thq0K5E0y2jAGmL BgBKGZwiUNrMFxxZB808NNl4nUB5xm8EStIZcL/VdMnjNxy6QtVH0NriaLpYn86jtUqCnqgx 82hliR7QU8XOR8jT/J2hjCT8CsNu2RXCD3vV/ABEZC6J+WRVEwlAw1eARSSkvGHJYAOmAHxS QJUD+GJCx50Xa+Dbx53/tgPsT37JnY+mALxVaCBsgke5wrKm30ABSNKRcoL95h22BqMsOEwu aAK2xoHyh+O55XMNTm2EE1aBDdtTu6GubRazYUithXnv4TxeDptzPuK2jf3FSaUPsCywVLVA qRYoLeDowQomQi4VSy9EeLjJRVJ5tEzsduGytBjMnbcp6DnIf/LLzQQ4JDABSGJCR/vM3B6x wD5UdDWWYS+fZ6MljNwEVpO4cJX9ekl6qIASi6KYSwwTwbD/LYdc5JTAKZXkr4mvOnrSL/eh v/7Rxlupbzf7pFpmW2My2/3zZz60xsSM0cf9QuKdfiZk+GzT+wYG9tnFmkcV3/Gzzjk9y4sO 5wVEbvhxiLm2rOaZIkXc5lWn4QYKzZFW5JGdtur1CJOk2x5lGLXzzDpxLmVxf7LGd2bSC7jH 5gzL1h0LTu9I1B++l/W59ia3K9xrK55UpHJkessDGmWempPe3l1hkaf2HazQyftGxFEuce8S NWfylKxDKWHYY0xIoxRKsSXuQHb3XTTG7v/NHnWRhu1VRQdR/hVay1rjxbGMM6Zg8ql6ktvc 69iXjh9UFzWevzOeUVNXaRxZeqx2wrMl3k2Iy8NEHpswVi76AykiwOkrAwAA X-CMS-MailID: 20250317050548epcas2p158c1bfcef5059e51afeab70680da5e5d X-Msg-Generator: CA X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250317050548epcas2p158c1bfcef5059e51afeab70680da5e5d References: X-Patchwork-Delegate: kuba@kernel.org From: Eric Dumazet tcp_abort() has the same issue than the one fixed in the prior patch in tcp_write_err(). commit 5ce4645c23cf5f048eb8e9ce49e514bababdee85 upstream. To apply commit bac76cf89816bff06c4ec2f3df97dc34e150a1c4, this patch must be applied first. In order to get consistent results from tcp_poll(), we must call sk_error_report() after tcp_done(). We can use tcp_done_with_error() to centralize this logic. Fixes: c1e64e298b8c ("net: diag: Support destroying TCP sockets.") Signed-off-by: Eric Dumazet Acked-by: Neal Cardwell Link: https://lore.kernel.org/r/20240528125253.1966136-4-edumazet@google.com Signed-off-by: Jakub Kicinski Cc: [youngmin: Resolved minor conflict in net/ipv4/tcp.c] Signed-off-by: Youngmin Nam --- net/ipv4/tcp.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 3c85ecab1445..c1e624ca6a25 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4514,13 +4514,9 @@ int tcp_abort(struct sock *sk, int err) bh_lock_sock(sk); if (!sock_flag(sk, SOCK_DEAD)) { - WRITE_ONCE(sk->sk_err, err); - /* This barrier is coupled with smp_rmb() in tcp_poll() */ - smp_wmb(); - sk_error_report(sk); if (tcp_need_reset(sk->sk_state)) tcp_send_active_reset(sk, GFP_ATOMIC); - tcp_done(sk); + tcp_done_with_error(sk, err); } bh_unlock_sock(sk); From patchwork Mon Mar 17 05:09:50 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Youngmin Nam X-Patchwork-Id: 14018634 X-Patchwork-Delegate: kuba@kernel.org Received: from mailout1.samsung.com (mailout1.samsung.com [203.254.224.24]) (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 8203C2153D3 for ; 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Mon, 17 Mar 2025 14:05:51 +0900 (KST) Received: from perf.dsn.sec.samsung.com (unknown [10.229.95.91]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250317050551epsmtip126608e9b9edf00a488a87c8491b1cb36~tfrYMwPPZ2597525975epsmtip1k; Mon, 17 Mar 2025 05:05:51 +0000 (GMT) From: Youngmin Nam To: stable@vger.kernel.org Cc: ncardwell@google.com, edumazet@google.com, kuba@kernel.org, davem@davemloft.net, dsahern@kernel.org, pabeni@redhat.com, horms@kernel.org, guo88.liu@samsung.com, yiwang.cai@samsung.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, joonki.min@samsung.com, hajun.sung@samsung.com, d7271.choe@samsung.com, sw.ju@samsung.com, dujeong.lee@samsung.com, ycheng@google.com, yyd@google.com, kuro@kuroa.me, youngmin.nam@samsung.com, cmllamas@google.com, willdeacon@google.com, maennich@google.com, gregkh@google.com, lorenzo@google.com, kerneljasonxing@gmail.com Subject: [PATCH v2 stable 5.15 2/2] tcp: fix forever orphan socket caused by tcp_abort Date: Mon, 17 Mar 2025 14:09:50 +0900 Message-Id: <20250317050950.2351143-2-youngmin.nam@samsung.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250317050950.2351143-1-youngmin.nam@samsung.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01TfVCTdRz3t+fxeTbO2dN46efAoqeo0IYbMvazRMmAdkVK2p3E6cEOHgcH e7ltcBC97BwEecUgXwaDrtkohBAQFg1wSOApwqWmh0ujI2e8JArEiKQLbWOz/O/z/fw+n+/b 775sjHeP4LNzlDpGo5Tl0UQA3jkQKRG0nXTKhYsCtNB3hUTXHFUkqrtUgqOW7lIWmrBU42j8 nItEE4tLGDp8BKCDZ65gyGUcJNBIzwyGejpNJLrcWbEa9Q9Mkuhqdx2BWodnAFp03CFR+agD R+csIWhx+A5AllMugEpvuUlUtjSNo4VbIwT64/xBEln75klkON6Cx4dKbY3XWdIu8y+k1NKe L21v+piQWipI6WzvCCGtsDUBqbv9yRR2Wu7WbEaWxWjCGWWmKitHKY+j39iT/mq6OFYoEoi2 IAkdrpQpmDg6ITlFkJST5xmaDi+Q5eV7qBSZVktv2rZVo8rXMeHZKq0ujmbUWXlqiTpKK1No 85XyKCWje0kkFEaLPcKM3Gz9D/UstSG00FR6YrUejIUcAhw2pGLgktMIDoEANo+yAzj8eas/ mAfwJ9sFwhcsAtjr+Bl/aHFPTLF8Dw4A22rn/cGfAJrOdGBeFUEJYOfgfU8uNjuI4sOxkZe9 Gow6i8Ph5rukVxNIpcLBmu8JL8apCHh6xrhSgUtth66Gv1heL6SegtZfoZfmUPFw6l6NX/I4 vFDz2wrGPBLDt7WYrzkjBxp6433WBDg39LSPDoS3z9tIH+ZD94yD8GEt1I/dwLytQaoEwCHn lD/PZmieKFtpH6MiYWv3Jl/KZ+DZG/6qa2H5wDLpo7mw/COez/gc/PtIG/DhMNhjPeFPKIUm m9W/28MAVjdPg0oQbn5kGPMjw5j/L2wBWBMIYdRahZzRRqs3//e/mSpFO1g5gQ2v2UH13bmo fsBig34A2RgdxDV+6ZTzuFmyoncZjSpdk5/HaPuB2LPpKowfnKny3JBSly6K2SKMiY0VSaLF Qgn9BLfYXiLnUXKZjsllGDWjeehjsTl8PevNZXUTrl5zmx31KSE5PtHlUt2kf3QnZTjSYu1H bbDLKlxVJCoKLqQ/S+Qk2b9oUY2nGfpmeQvri+rWSycVgxcn3SczggrsYaed2wXZXwV3dLxS WOn6upgX+uJs5tyq0YSdawtcwqTdV3cpj/X/w20Yn04W2MfeiTzQXGbOnZoPNPXERewvMA9s rN+Hb1xTudek+K7WuXvnUGrEwNHqxh1j3Q/2rFte3ra32NQQXH6zaOEbXnNq4rq+x0T82X3P RlQFvOe4lh62Xyw21r5t+f3DMDp5/H3OqU+u13CndxQYjtUX6w88f0k1GmW9f5HA9E2vyzJG S3clqhsfzF+WvfDBW3NSGtdmy0QbMI1W9i9pB/s6iwQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrMIsWRmVeSWpSXmKPExsWy7bCSnO76tdfTDbadlrT4cuASu8W1vRPZ Leacb2GxWLerlcni2YIZLBZPjz1it3j27SezxeQpjBZN+y8xWzzqP8FmcXX3O2aL3dums1tc 2NbHanHo8HN2i8u75rBZrD/9jtHi29437BYdd/ayWBxbIGbx7fQbRosFGx8xWrQ+/sxu0f7z NYvFl8dX2Sw+Hm9it1h84BO7RfPCdSwO0h5bVt5k8tg56y67x4JNpR6bVnWyeSzoY/d4v+8q m0ffllWMHp83yQVwRHHZpKTmZJalFunbJXBlNJxdwlTQLF0xvXUFawPjfbEuRk4OCQETic/P XjCB2EICuxkl2o+GQMRlJG6vvMwKYQtL3G85wgpR85lRYstqXxCbTUBXYtuJf4xdjBwcIgJS EvevWncxcnEwCzxjkWhZc4IRpEZYIEyi4fxhZhCbRUBVYs+7fhYQm1fAXuLR8u9MIL0SAvIS ix9IgIQ5BRwkXvyYyQKxyl7i1udp7BDlghInZz4BizMDlTdvnc08gVFgFpLULCSpBYxMqxgl UwuKc9Nziw0LDPNSy/WKE3OLS/PS9ZLzczcxguNVS3MH4/ZVH/QOMTJxMB5ilOBgVhLh7V90 PV2INyWxsiq1KD++qDQntfgQozQHi5I4r/iL3hQhgfTEktTs1NSC1CKYLBMHp1QDE5dWzqYr W1M9q31kTFY777BT2hlQI6Dg8sxy5oKXHyf6hzs13nd8XrJ4aiPfgm3uk78rB+5ZpJ1XHcDt Ot3LWo2lSjDv86V5eds1Lz6xczq40Wtn7fSUp8GPV/jPK00+p3g0wFfS9oDCCu0zM/a3aFz3 s/ogVnzXgqnp4EzlxlSFUFfj6tCfXBq6FUXLZJiaXA/kv36syfTlzfvjlyOUjnGYdyZ9Cnya I5DoWnfXdZrY9LmTPyY375n4sU3wUP4ksXlHss4lNkmK61h3zJnQFsm8h1/VpTJ4XrJU/GK9 jQrLXh9dMaFzEruIz+qAdRbNAlzsX7bvZxb+nXFjkiHv281L1fPXxdieqX4qm8uvxFKckWio xVxUnAgAxCtET0YDAAA= X-CMS-MailID: 20250317050551epcas2p365f292c4cecce8c4d15960c4219a44c2 X-Msg-Generator: CA X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250317050551epcas2p365f292c4cecce8c4d15960c4219a44c2 References: <20250317050950.2351143-1-youngmin.nam@samsung.com> X-Patchwork-Delegate: kuba@kernel.org From: Xueming Feng commit bac76cf89816bff06c4ec2f3df97dc34e150a1c4 upstream. We have some problem closing zero-window fin-wait-1 tcp sockets in our environment. This patch come from the investigation. Previously tcp_abort only sends out reset and calls tcp_done when the socket is not SOCK_DEAD, aka orphan. For orphan socket, it will only purging the write queue, but not close the socket and left it to the timer. While purging the write queue, tp->packets_out and sk->sk_write_queue is cleared along the way. However tcp_retransmit_timer have early return based on !tp->packets_out and tcp_probe_timer have early return based on !sk->sk_write_queue. This caused ICSK_TIME_RETRANS and ICSK_TIME_PROBE0 not being resched and socket not being killed by the timers, converting a zero-windowed orphan into a forever orphan. This patch removes the SOCK_DEAD check in tcp_abort, making it send reset to peer and close the socket accordingly. Preventing the timer-less orphan from happening. According to Lorenzo's email in the v1 thread, the check was there to prevent force-closing the same socket twice. That situation is handled by testing for TCP_CLOSE inside lock, and returning -ENOENT if it is already closed. The -ENOENT code comes from the associate patch Lorenzo made for iproute2-ss; link attached below, which also conform to RFC 9293. At the end of the patch, tcp_write_queue_purge(sk) is removed because it was already called in tcp_done_with_error(). p.s. This is the same patch with v2. Resent due to mis-labeled "changes requested" on patchwork.kernel.org. Link: https://patchwork.ozlabs.org/project/netdev/patch/1450773094-7978-3-git-send-email-lorenzo@google.com/ Fixes: c1e64e298b8c ("net: diag: Support destroying TCP sockets.") Signed-off-by: Xueming Feng Tested-by: Lorenzo Colitti Reviewed-by: Jason Xing Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20240826102327.1461482-1-kuro@kuroa.me Signed-off-by: Jakub Kicinski Cc: Link: https://lore.kernel.org/lkml/Z9OZS%2Fhc+v5og6%2FU@perf/ [youngmin: Resolved minor conflict in net/ipv4/tcp.c] Signed-off-by: Youngmin Nam --- net/ipv4/tcp.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index c1e624ca6a25..7ff0ecb59579 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4504,6 +4504,12 @@ int tcp_abort(struct sock *sk, int err) /* Don't race with userspace socket closes such as tcp_close. */ lock_sock(sk); + /* Avoid closing the same socket twice. */ + if (sk->sk_state == TCP_CLOSE) { + release_sock(sk); + return -ENOENT; + } + if (sk->sk_state == TCP_LISTEN) { tcp_set_state(sk, TCP_CLOSE); inet_csk_listen_stop(sk); @@ -4513,15 +4519,12 @@ int tcp_abort(struct sock *sk, int err) local_bh_disable(); bh_lock_sock(sk); - if (!sock_flag(sk, SOCK_DEAD)) { - if (tcp_need_reset(sk->sk_state)) - tcp_send_active_reset(sk, GFP_ATOMIC); - tcp_done_with_error(sk, err); - } + if (tcp_need_reset(sk->sk_state)) + tcp_send_active_reset(sk, GFP_ATOMIC); + tcp_done_with_error(sk, err); bh_unlock_sock(sk); local_bh_enable(); - tcp_write_queue_purge(sk); release_sock(sk); return 0; }