From nobody Fri Jun 20 10:03:19 2025 X-Original-To: net@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4bNtMq1mRbz5yq8b for ; Fri, 20 Jun 2025 10:03:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R11" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4bNtMq0kgBz3HBj for ; Fri, 20 Jun 2025 10:03:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1750413799; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bZZ7u2VyZHu3ta6ty23rRSnZd6ac/fIdZJoGFt89jP4=; b=LhGM8BWCQCuFs4KUXM6vo0GNN+uEwZreNUARDf+AcsuYqSOfGbtUTNmlC4zhl8TGy1tYYK hl5G3whrf2lVs2C//Lv/W45xyEB2E6EqiAAYgwkwu2kFGRNkynrjRtkFU9zbIuL82aDxG5 Jzb5G1b2xB+giiVyBUOvY/lrsNXjrKh6KGygsjNgicBylFfIb4eCAWYVfEX7kRe11yMVM3 i3+64/xDjJY49TRMeY/HB8jfibW8FmEEkH1Sv2U+QNA08oXu1Ca8UdEcsLcGtodN+ZQu0/ nV2zsrq+Ex0bemuqsvX8vCUH1gdBTuF+wglCyGMLjAeMuWrfdKCzbMiimdNDsA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1750413799; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bZZ7u2VyZHu3ta6ty23rRSnZd6ac/fIdZJoGFt89jP4=; b=U+cImMDI0d1gNzEZB302k0PMnbU09VXdAZpDM5Zqwr4IxtU4laYoXCmLLT0r7qP/hU4EGk 7/mWKjjMyWsj1JB8OkWnfNW0LvCW+Pm3h89nAPINGVph6PndP2TZHJairaFDXMR25NOES0 ZaZTLegMFB1EAyHPsry6EUY0adeXvlp221igm+xk1vccJMiQ9Ni/QWPdQ1Pa8D8badzzno zn64RLnZJIZSUCc/GWuLvCZLvgeZ7g/sAdo8xb3/ifRE4alBOQvUj+DjWe613Q2/qunDbI e061B9SS1gSnm26VQmPKLbtiJAoNDY9QGhDWFo2JadNQDN1+Ptj9u8QvYCKYUw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1750413799; a=rsa-sha256; cv=none; b=CT3qawW/Yxefgbn0hVnlwI0ye9DGrn36qa3Rt8cSPCkdlsvrY6aoWkJi5wWx5fU0NItzWf Z1iP41SSc0HfoMvPMfInJRa6r2KancLikCs4bHd4Tpq7YChwCOT0bV45NWhFyhgm7vWNbK ABXfF8XDHTqbZio0pjX+q+LDocV9UDu3mDzu+cAayhxNiv86JlScyOQRofmAgBWkh++N4O iAYoztWcrbo6+i5V7vFhNt+ymsWE/yEfMzNNQrJ7hrKUrKExX/eVokvi3UoaceZ3UQpxW2 v527f1NDJ1mptRWbeLcZMXooQuJY9eyoqhRAMBlMSkj+DHndUMNHW+3JXisjbw== Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4bNtMq0BSNzhK3 for ; Fri, 20 Jun 2025 10:03:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 55KA3Iol037688 for ; Fri, 20 Jun 2025 10:03:18 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 55KA3IEU037687 for net@FreeBSD.org; Fri, 20 Jun 2025 10:03:18 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 287229] IP reassembly issue in FreeBSD 14.1 Date: Fri, 20 Jun 2025 10:03:19 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 14.2-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: lucas.aubard@irisa.fr X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: tuexen@freebsd.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D287229 --- Comment #24 from Lucas Aubard --- (In reply to Michael Tuexen from comment #18) Thanks for the details! We are currently working on Network Intrusion Detection Systems (NIDS) evas= ion with overlapping IP fragments or TCP segments.=20 Some NIDSes (Suricata, Snort) propose configuring their IP and TCP reassemb= lies based on the supervised host OSes as an evasion countermeasure to overlapping-based attacks. In that context, we test OSes (and other stacks)= to obtain and describe their reassembly policies so NIDSes can implement and propose them. >From a NIDS perspective, OS reassembly consistency is thus quite important. We recently wrote a paper on that subject https://arxiv.org/pdf/2504.21618 (that will appear at DIMVA'25) if you want more details. The 40 processes do not correspond to any particular real situation I would= try to reproduce. As I mentioned, I test OS VMs simultaneously if possible, and= 40 processes is a good tradeoff between the time it takes for the entire experiment to finish and the number of VMs I can run in parallel. --=20 You are receiving this mail because: You are on the CC list for the bug.=