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Mon, 17 Mar 2025 14:03:46 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas2p4.samsung.com (KnoxPortal) with ESMTPA id 20250317050345epcas2p4cc44d6e10bb9916fba56d633f505a7e5~tfpjbzg6k1034110341epcas2p4J; Mon, 17 Mar 2025 05:03:45 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20250317050345epsmtrp1458ed71deaa687a563cdb11d04398c2a~tfpjZw-N_0187101871epsmtrp1P; Mon, 17 Mar 2025 05:03:45 +0000 (GMT) X-AuditID: b6c32a48-e7eec7000000564e-e0-67d7ad32b25f Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id F3.27.23488.13DA7D76; Mon, 17 Mar 2025 14:03:45 +0900 (KST) Received: from perf.dsn.sec.samsung.com (unknown [10.229.95.91]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250317050345epsmtip1b127f254a5bcd3787aea173ded975727~tfpjDOBAE2572925729epsmtip1i; Mon, 17 Mar 2025 05:03:45 +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 6.1 1/2] tcp: fix races in tcp_abort() Date: Mon, 17 Mar 2025 14:07:42 +0900 Message-Id: <20250317050743.2350136-1-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: H4sIAAAAAAAAA01TfVBUVRT37nu892CEeS4b3DZDZjUamQF3Nz6uJUggzmbUMONY2GDwBp7L xn7Nvt2mZCjiQwiK1STFhaYVaCI0kQ0YXKSINSBIMBEIikhQUD5EWEOxwnbZtfzvd8/5/c75 nXPvpTD+LCGkFGo9q1MzShHhhTfbtqIQ6dfDcnHPtC+6236FRENtR0lU2Z+Po7PWAh6aMpfj 6EbnBImmllcwdKwMoNzvrmBowthNoMHW2xhqbT5BosvNpR6owzZNogFrJYHqe28DtNw2R6Ki 39pw1Gn2Q8u9cwCZGyYAKpi0k6hwZRZHdycHCbTYlUui6vYlEuWdOovHPCVr/GqEJztvGiNl ZotBZqn7kJCZS0nZwreDhKy0sQ7I7JaAROqNzB0ZLJPO6gJZdZomXaGWR4le3psSlxIeIZaE SLajSFGgmlGxUaJdCYkhuxVKx9SiwLcZpcERSmQ4TrQteodOY9CzgRkaTh8lYrXpSm2kNpRj VJxBLQ9Vs/rnJWKxNNxBTM3MaDs/6KE1rn9nsbwXzwGfeRUDTwrSYdB6pBMvBhTFp1sAXNhX DLwccAnA07UVHq7DMoBNHzQQjwS/2vLdiTYAx2ZMHs4En/4TwAt5Kicm6BDY3L0KnFUFtBCO D77g5GP0RRz2npknnRxfOgb2nOrjOTFOPwNH783hTuxN74RDi7+QTi2kN8HqP6ArvAH+ePL6 GgVzhPOaKjBnTUjfoWBv2RjPZW4XHPl7hnRhXzjT1ejGQnjLeNiNOZgzPuoW5wPYM3wTcyWe g6apwjXTGL0V1lu3uTxshhdH3X19YJHtH7c1b1h0mO8SBsEHZeeAC2+ErdW17oIyaL+/hLu2 cwA+rKzGj4BNpsemMT02jen/vmaA1QE/Vsup5Cwn1Yb9d6NpGpUFrL36YFkLqJi/E9oBeBTo AJDCRAJvY9WwnO+dzrx7iNVpUnQGJct1gHDHeo9iwifSNI5vo9anSMK2i8MiIiSR0nBxpMjf O6slX86n5YyezWRZLat7pONRnsIcXnGCVK0KXs27qph89tpi3yWvV4ZLxpIKu06bfB7WmFOL vhG+xu00xKfuyxO0Mw8KmNpiZcNAWe6F7D0H7BMv+o1X+Ht231s4+MlHx/uMQfvzYxOY5EM1 qCQ5+fUGgXVLvCH4TFCgVOivmM+O+nlPv+CGD288q3Ex/GTodct79eJVScpwfaL92rEnh8CK wjrdGLKuv79qvaXqRPS6JPunr6qz98/eesun6/5LGwfif48W5B6MHFux+RH2mO+7A1I3FP50 vHzk8ptZl6KT6wqJplgRyP1r7tzTnqov4hbiOvps/uWyvT9c3VIi/tKeQ30e+7H9/cm4pPSw dkNNbMDuzUU35VKeCOcyGEkwpuOYfwHYxFCMfgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA02Ra0hTYRzGec85O+c4Uk7T9E1l1io0wctS6s1kSmacjKLUrhA69TBNXWtH uxLVnKgjZmUXs0UzP9SWJg4b5ZjXMMvIMtbFiobLSWWGKcbCblMCv/14fs/z//KncZGBCKYL lCWcWikvkpBCwtojEUdJm14pYnWvV6KpzkEKvbSfo5BhQEugO23lGHIbawk00jtMIfe0B0c1 FwDSdAziaLi6j0QO2ziObNbLFHpm1QtQd88ohV60GUjU3D8O0LR9jEKV7+wE6jUGoun+MYCM LcMAlbsmKVTh+UKgKZeDRBMPNRRq6PxOobL6O0RyCNtqeoOx9+veU6zRUspazFUka9RT7Ld2 B8nqW82AnbSIt9F7hYl5XFHBIU4dI8sW5tvvOwSq6gVHJmr7iVPgmlAHfGjIxMO3PVqBDghp EWMD0HBulJwTofCt6YVgjv3hB+2DWRYxkwA6b1JeJpkoaO37DXSApgOYYPjBsc57B2fcBNQ2 9gFvx59Jho/rn2JeJpgVcOjHGOFlXyYJvpx4TXm3kAmDDU44Fy+Ej658nK3g/+Kyu1fxs8Cv bp6qm6eMADODxZyKL1YU50pVUiV3OJqXF/OlSkV07oFiC5h9YGTEPTA+rYnpBhgNugGkcUmA b/WNVwqRb5786DFOfSBLXVrE8d0ghCYkQb4m6W6FiFHIS7hCjlNx6v8Wo32CT2Hbn2QZ3Has azQox68kUd4YuqizCltGiAtTMhv2SZSmWtY/XU/+HDHLwvoX1Ck3JCX4nOaTNEzcqq0BJS12 q2XoSOKS1Um2XX7Ps7RbVGIsvSBjSfoiOj5VmC9tDtDtOAFqvrmC0lTOSsblCdfUTrYzTrFs pBlFuApdy7gU19BMu0Nh35hx4ZL7+vpfgnjhD0PX45MxgTldPR0zsQMJfP3tke+3Igdm9tRs 1qWZBg6uTgvNtM+0fg6PqbCFedYcipRVZo2WeS6ad659dkyX2lupTx2URW+K+iMuxFsuj2ef jzu+nOuKGkwvbW/C+Zavn84svVZm2rX/i/yK872E4PPl0khczcv/AvgPiZgvAwAA X-CMS-MailID: 20250317050345epcas2p4cc44d6e10bb9916fba56d633f505a7e5 X-Msg-Generator: CA X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250317050345epcas2p4cc44d6e10bb9916fba56d633f505a7e5 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 7d591a0cf0c7..1ad3a20eb9b7 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4755,13 +4755,9 @@ 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 05:07:43 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Youngmin Nam X-Patchwork-Id: 14018632 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 A1B892163B8 for ; 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Mon, 17 Mar 2025 14:03:50 +0900 (KST) Received: from perf.dsn.sec.samsung.com (unknown [10.229.95.91]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250317050350epsmtip1a19fb8300f2c56734dbb06b648c66307~tfpnt-ySV2650226502epsmtip1B; Mon, 17 Mar 2025 05:03:50 +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 6.1 2/2] tcp: fix forever orphan socket caused by tcp_abort Date: Mon, 17 Mar 2025 14:07:43 +0900 Message-Id: <20250317050743.2350136-2-youngmin.nam@samsung.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250317050743.2350136-1-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: H4sIAAAAAAAAA02TfUxTVxjGOb3l3gJju1TEAzqpNfsAB7QI9ODsJJZJl7mMsQ8YarDCtRD6 ld6yzBGQUT67BAScOmSuwhKw0SKsED7CdOCASbYRJjSIGwwGAgNhgGjHxLXcuvnf77znec55 3vfkcDCuDffjpKl0lFYlU/Bxd3ZzV0BEkOiKVS6oM/iilesDBBrqKCNQ1c95bGRuy2ehKeM5 NprsHifQ1KoNQxWnAcq9NoCh8dJeHA2238NQe/NZAvU3l7iizq67BPqlrQpH9X33AFrtmCNQ 0Z0ONuo2+qDVvjmAjA3jAOVPLBOo0PYnG61MDOLor55cAtVcXyKQ/qKZHbVVark0zJK2Vv5K SI2NGdJGUzEuNZYQ0oVvB3FpicUEpMuN22M5iel7UylZCqXlUapkdUqaSi7mv/lukiQpPEIg DBJGIhGfp5IpKTE/+mBs0IE0hb1rPu8jmSLDXoqV0TQ/5LW9WnWGjuKlqmmdmE9pUhQakSaY linpDJU8WEXp9ggFgtBwu/BoeurYQC6h0W/9uKBkkZUDRn0MwI0DyTDYf/4K28FcsgXAW4/E DC8BWPvTcwbgbudVAA36IfDEYJ62YsxGB4CFvevOxX276tIky6HCySDY3Ltud3A43qQfHB18 1aHByBts2Hd5nnBoNpHxsLjtU1cHs8kXYO+tJdzBnuQ+WLWct+GFpD+sGYOOshsZBR/WN7gy Ei/4wxd/bKTG7BJ90/mNDJD8zA0O5k+wmKTRsHa6HGd4E5ztsRAM+8GZ0gIn0zBn9LbTnAfg Tes0xmzshpVThRshMDIA1reFMHl2whu3nfc+C4u6HhFM2RMWFXAZ44vw79NXnbPaBttr6pwH SqGpwMJmRlUBYH95LTgFeJVPtVP5VDuV/19sBJgJ+FAaWimn6FCN8L/3TVYrG8HGHwh8vQVU zC8GdwIWB3QCyMH43p6l1VY51zNFduITSqtO0mYoKLoThNtnXYb5bU5W2z+RSpckDIsUhEVE CEWh4QIRf4tnZkuenEvKZToqnaI0lPaJj8Vx88thyYdHMkfvJh7Z7a3+x9Id7z8yc/gbl6wP T06OrTweZ02RCnPefLI1pvoAiNrRerXEw9s18HirzownnBoub0vQlq+/HIdtlmyz5vZ4ScJ2 ZLr4f69LXHxoJnybbJzRt7oN+9OzTOZpvUE7+/UD7p0R//ALJ/TdKdnYSzlvlFn2ZL1Tpai2 VasPHR4LMu3fJdacKytPvB9TKNEcf5yde2hmIVQS8/xR8Bv1ytD7B79778E+a1VTu2/9V6Ij AVu6LmqnPEJu9ke7fLld6RL4Nq84TVm3cy3rg8hjtmNJa/En1zw+j73gpZ0tpMX5Z+KKf5xb +P2ZGAm3Zdhdvyvhcnxc9rUGIc5n06kyYSCmpWX/AqphAkeMBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA02Ra0hTYRjHe3eO5xxHxmmKvakYDCIbZWoSr2WWXQcl5YfRjbKhhyW6ObY0 FSlxs7zg7H7RVUuJctnUpcu5LXWKTYuyeUvMNC0tmlNTRkZFbRX07cfz+z//58NDYZx6PIBK lpxkZBJhKpdg44Y2bvDaDQ8HRGHFUyFovsVOon7LBRKpXypxpGvKZ6EJzXUcfegYI9GEawFD ly4DlNdsx9BYqY1AfSYnhkyGayTqNqi8kLVtkkQ9TWoC1TxzAuSyOEhU8MaCow6NP3I9cwCk qRsDKH98jkTnFj7jaH68j0CzT/NIVNnyhUSKOzp8ayC/vmqQxTeWDZN8jT6dr9cWEnyNiuRP P+kj+Kp6LeDP6YP3U4fZ0UlManIGI1sXc5x9YtSeR0oVgZlnVTOsXDDiXwS8KUhHQt3HAawI sCkObQKwSbFA/BFBcKiqx+sP+8IRZbuHOfQcgHWtkW4m6LXQYPsJigBF+dEBcKRvk7sHoydw qKy2AXfGlxbAQusL3M04vRLaer94+n3oLVA9p/TsQnoFrByF7rE3vRV+ran7e2oL7BhV/Y0v hZ033ntqsN9xRUM5dh7QZf+psv+UBrC0YDkjlYtFYnm4NELCnAqVC8XydIkoNDFNrAeex/J4 jcCsnQm1AhYFrABSGNfPp7RiQMTxSRJmZTOytARZeiojt4JACucu83F9Lkni0CLhSSaFYaSM 7J9lUd4BuSw9L4UXuP5ohCRx9oc2pbQ97WOHU1xUO/EayTrf+LIXFcRGFCzutVRnvo3y7Y1w Zp1/1BBZG1MOcjrX3L/7/Ea31+rDCa8Kb9qDD/VOCt4ZHyhzNm+D00fsIzWm2cSz5sfvutRf Hf57Q8gz5ijH4qvP44eKBZ+klXGuB9uDHupVigBW99GmKsGU2X7kdlB/Qqxx5hE7K/5Tbfu4 yRBtb9Vn2jXqXOK0RXdq5pt51RB3+f7qcmdD6IHJ5Fu21cmodedFa37YhjvKbEP09xZg7Dpo xI/vmDo4vK8EELd2CZoHRWKOfvexihVx3HFdfRdcsme+8XLLjo0Zbfdi/aLPXeHi8hPCcB4m kwt/AfJgvLdHAwAA X-CMS-MailID: 20250317050350epcas2p3612d0b2787f9e21ab4719b9bf8a70c54 X-Msg-Generator: CA X-Sendblock-Type: AUTO_CONFIDENTIAL CMS-TYPE: 102P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250317050350epcas2p3612d0b2787f9e21ab4719b9bf8a70c54 References: <20250317050743.2350136-1-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 1ad3a20eb9b7..b64d53590f25 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4745,6 +4745,12 @@ 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); @@ -4754,15 +4760,12 @@ 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; }