From nobody Tue Jul 06 07:12:48 2021 X-Original-To: ipfw@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 ACBBB8D5546 for ; Tue, 6 Jul 2021 07:12:48 +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 "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4GJv004LXSz4bCt for ; Tue, 6 Jul 2021 07:12:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) 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 7ED5D15907 for ; Tue, 6 Jul 2021 07:12:48 +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 1667Cmis050751 for ; Tue, 6 Jul 2021 07:12:48 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from bugzilla@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 1667CmgB050750 for ipfw@FreeBSD.org; Tue, 6 Jul 2021 07:12:48 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: bugzilla set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: ipfw@FreeBSD.org Subject: [Bug 192888] ipfw NAT vulnerable to simple DOS attacks Date: Tue, 06 Jul 2021 07:12:48 +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: 9.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: commit-hook@FreeBSD.org X-Bugzilla-Status: In Progress X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: donner@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: IPFW Technical Discussions List-Archive: https://lists.freebsd.org/archives/freebsd-ipfw List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-ipfw@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D192888 --- Comment #10 from commit-hook@FreeBSD.org --- A commit in branch stable/12 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=3D1883127de4888b2a30a6cb51e8fb4bdf3= 3b7f411 commit 1883127de4888b2a30a6cb51e8fb4bdf33b7f411 Author: Lutz Donnerhacke AuthorDate: 2021-05-27 21:42:54 +0000 Commit: Lutz Donnerhacke CommitDate: 2021-07-06 07:10:02 +0000 libalias: Switch to SPLAY trees Current data structure is using a hash of unordered lists. Those unordered lists are quite efficient, because the least recently inserted entries are most likely to be used again. In order to avoid long search times in other cases, the lists are hashed into many buckets. Unfortunatly a search for a miss needs an exhaustive inspection and a careful definition of the hash. Splay trees offer a similar feature - almost O(1) for access of the least recently used entries), and amortized O(ln(n) - for almost all other cases. Get rid of the hash. Now the data structure should able to quickly react to external packets without eating CPU cycles for breakfast, preventing a DoS. PR: 192888 Discussed with: Dimitry Luhtionov Differential Revision: https://reviews.freebsd.org/D30516 Differential Revision: https://reviews.freebsd.org/D30536 Differential Revision: https://reviews.freebsd.org/D30844 (cherry picked from commit 935fc93af157dee352eb4b6c83f8a2a9e7fd9a4e) (cherry picked from commit d261e57deacb0d00d9e827447f235df83dda3e3a) (cherry picked from commit f70c98a2f5d993dc518efd606aa341eda99400ef) (cherry picked from commit 25392fac9488bcae5c451500df2e2945430484a6) (cherry picked from commit 2f4d91f9cb22fc65eb65407e8118b433a5d71976) (cherry picked from commit 4060e77f49d1b9fd2254f3f4da94fd64fce83f72) sys/netinet/libalias/HISTORY | 3 +- sys/netinet/libalias/alias_db.c | 502 +++---------------------------= ---- sys/netinet/libalias/alias_db.h (new) | 443 ++++++++++++++++++++++++++++++ sys/netinet/libalias/alias_local.h | 10 +- 4 files changed, 489 insertions(+), 469 deletions(-) --=20 You are receiving this mail because: You are on the CC list for the bug.=