From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.128.53 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793985286; b=cvA/J8tdbNBQEgWZHKJho8syDKabciCfuEnUVrmZJPQI3K5HBZKS+/KttyQKvCQgQM9I 7bD8AGlh5B3JDp7dzyl3p/NGYIV3Am/L/cQ3JSGne+pGofpRUWa9J/tKvEg3kdGJ5oBFI /RGxzjQhlJMPY5UnlMGETe4DhwPD85mdm7g90YlIumi9Sf/wwi0EyPijYbdDisw5iZRzo 0tqj7Fi+/Mh4UZNHMG1OFwepJzGegzY1PrwNBbfZYbXZ2x9y6aQRFZyw8TT2/3OMnPitc VndQeDbModlMUs+EjoSUQ2OZS23nH8ljYqhqqQVtaDlQvzRfs1uSu2h+/x2P38h32iQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793985286; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Gm-Message-State:X-Gm-Gg:X-Received:Received:From:To:Cc:Subject: Date:Message-ID:X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=gFMNpPgUqxIZwuBYx5VHNDYSqSG4TYjNvTKYc8aY2So=; b=zomv2B/gHnsgvJMdQ/YZoqi9DyaDPotvmDZ++Zr1GRf3WIJXCTqfdLyAPuK/wyD7iNwZ Z/DTNyGun9yLEovyYA8rh5yy0SN6LIfE7R/VPmYovqoseVG3P8LTvdEd1NccTiwPQceQC xNN5XPYb7z2/pEn4V/pxo5mQcl+tnR73EqXUr7DsJC4TUGAWEYx0Xzs0C/MbpZcQ692Ls KDVZIg5UOItc729y4X1KiqdzNzjqpijlrWB/SFhuHMLrpni9mIkRcJmOdHCgVqh4TsCnQ w2TyyandgghW35TEjo/9i2U37J5p0gTvQ+qsxKkKa55zGoglYRdr8CMv4D53CUi3piw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=C3qjFtiv; arc=none smtp.remote-ip=209.85.128.53 Received: from mail-wm1-f53.google.com (mail-wm1-f53.google.com [209.85.128.53]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27A5A606A326 for ; Fri, 6 Nov 2026 17:14:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 27A5A606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=C3qjFtiv Received: by mail-wm1-f53.google.com with SMTP id 5b1f17b1804b1-4a20bde60a0so7848925e9.3 for ; Fri, 06 Nov 2026 09:14:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793985284; x=1794590084; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=gFMNpPgUqxIZwuBYx5VHNDYSqSG4TYjNvTKYc8aY2So=; b=C3qjFtivHTMqEpliOCOxxhF3ZCmOfyL04GUMc2el0XChisOndRclY0s4aMkvcrDWyI kPwgN4eUdVa374BsKE1zgaukiYia5UH7uePCYZjv2O6G8Gsi1epwGY64np2/ZquImhLE XVwomB8LtcMWnRbJHU2+L4eVPpIiI8g26WX/E3TgUinuWNK5HyUP4GFXTIJZDDQ9LhLx 6Q8Q2XaM3PF7Xk/Wj2LrNKzCZrAf8OOQRciKrcnbXyGUV37SkBAHaprRDt4Or6dwPwGA 28vfQbxjxdhaKLGSDLJKEsi9r9IQrCJ0cRk8kZTLt0vyEUabmVsPBcdGGxWkScwMyDfu oG3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793985284; x=1794590084; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=gFMNpPgUqxIZwuBYx5VHNDYSqSG4TYjNvTKYc8aY2So=; b=UPaLziBuFf1VO4VZ7Z9bG2bk2WVf5/341HZ7kOgAzZx6llyCQmAnJJEUEjSJbDxYjI 3u/Y0Zc1za6a2RaaLExI414rroNuVYUCQIruo54Nhzw1p0w2mvEzC9iFtYZC2Vml5fNN Pe+pQMM1X2ToJtAt144nqLMVY4elJ46RoMUdFAsXs/xk4oKSW4Uq3imP+fip55BW2dPp mwC9DihZJ66UGmgg13ayls3nNCJ8pe0ccKcqplpUYt3RZJpNutQBBERGWlYj+u0azBU7 EgeIj0OBuVrcFYm8LKsTmwmlCs/HUVICofLQuZ7/dRUfvLe4S1J85m1gsLPwoPhjqV1n CHRw== X-Gm-Message-State: APuU4Z9U2X7mLAKXmqXzytbhY46eyi9wt6+m4GEuKmRrUBn5ql6GKBXJ Px5oNO6VUOl80/Ufmmzbg8NU6xPqCyUICt9BTnyo+qkjrgcNnjHGDwDRwtauLhva X-Gm-Gg: AYBFou03DhRqb8+yZMU20cvkmhoIfOoeMJ6l7tnApwzXjGGO1GuBoWFXP9t4ppwRwnx T+nm9/lWRCcJDPep7rrFgDBxtLaprIMlKPLyCGF3YKP1kktreLMjKl9vUgR7LnGaNgEBqsqFtpN FiW6DhWBfT3S8KJj8AqsVXoqupq1jZX+OR8De/wCBXowts4C443pFuJOZYI+A8gPW/UKXcus8da r0OfLnGcm35IQHNOcAhzkz6srMxW8CLQocAM1IuCT0MUQ+TCQyorWnOv6zahsBJKngG4aAut8b0 86XJWaUxs2Q1UXZTZnmHEaqpK/oLvGEoPm/tinhqDGXSOd0bV9mjHMQWl7SqQKIxkmJDV5sgmjJ KvasvWU6RhnugjDNR6s5rCYco+nhhn9BxgEtqnvhiaLQkZaXtkHM/JCeTDTElLtOUPAFcwz8pBp rPXHGUOztiQyzEs4roTcT1PkZx3KSxLnSDC0FJHC4T0by5Yt5eR1TnKGtLQ/hMMHZWizKcOkiT2 YnLeLEN657hVrV5qfwzZNcdYwrmmTi6pNCSj69zzwA0iUJqiD+mzeGDDBrRJ2oBmLRu6X/QvPgL j5tD6Qw8vKysy2HPcMxHGWjYPUd8a7qwBgMf8evXYeFSM2hdyL+R6COo2eZwGRI9o3WOd/txiOw Gv4vRV0pX74aML3SJYNC0zD/xFZD/FiD/kM7+ppdatzeqJtuUanaBSPAXYsdyIx7uq7ZIKKPx54 EUJr1GNlpATBEf83KRztFrzd3FsKV99GWs38PvNuWe/QilH7G0l71r9VGRVdQaqA== X-Received: by 2002:a05:600c:5391:b0:4b1:4da2:ca99 with SMTP id 5b1f17b1804b1-4b6dd82a9aamr53584665e9.10.1793985284502; Fri, 06 Nov 2026 09:14:44 -0800 (PST) Received: from localhost.localdomain ([90.95.39.175]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b571f46489sm148071985e9.3.2026.11.06.09.14.43 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 06 Nov 2026 09:14:44 -0800 (PST) From: Florin Badita-Nistor To: netdev@vger.kernel.org Cc: edumazet@kernel.org, ncardwell@google.com, kuniyu@google.com, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, shuah@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH net-next v2 0/2] tcp: fix false exhaustion of odd-sized bind port ranges Date: Fri, 6 Nov 2026 19:14:40 +0200 Message-ID: <20261106171442.31811-1-baditaflorin@gmail.com> X-Mailer: git-send-email 2.51.0 X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fix false bind() exhaustion when an odd-sized local port range still contains an eligible free port. The wrap can flip parity in odd-sized ranges; even-sized scan sequences are unchanged. The namespace-wide connect() allocator is not changed by this series. Earlier x86-64 KVM validation of this unchanged allocator/test code: - Regression test: four failures before, zero after (eight cases). - Full port-range suite: four failures before, zero after (80 cases); two existing SCTP XPASS results unchanged. - Go net.Listen, 100 attempts per IP version: 100 failures before, zero after; explicit free-port controls succeed in both kernels. Changes in v2: - Target net-next and drop the stable Cc, as requested by Eric. - Document parity changes on odd wraps and scope the fix to bind(). - Shorten the cover letter. v1: https://lore.kernel.org/netdev/CADnh+D0zSzAyYCLo5cXU56o9X-P3RG3N2ix7ARPrP95d8sBXmg@mail.gmail.com/ Florin Badita-Nistor (2): tcp: avoid false bind exhaustion with odd-sized port ranges selftests/net: cover odd-sized local port ranges with one free port net/ipv4/inet_connection_sock.c | 2 - .../selftests/net/ip_local_port_range.c | 67 ++++++++++++++++++- 2 files changed, 64 insertions(+), 5 deletions(-) base-commit: bb67589c87249c9bc2415ab11a754d6e303774e3 -- 2.51.0