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GET /api/patches/2216152/?format=api
{ "id": 2216152, "url": "http://patchwork.ozlabs.org/api/patches/2216152/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260325222615.637793-6-pablo@netfilter.org/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/projects/26/?format=api", "name": "Netfilter Development", "link_name": "netfilter-devel", "list_id": "netfilter-devel.vger.kernel.org", "list_email": "netfilter-devel@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260325222615.637793-6-pablo@netfilter.org>", "list_archive_url": null, "date": "2026-03-25T22:26:06", "name": "[net,05/14] netfilter: x_tables: reject unsupported families in xt_check_match/xt_check_target", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": true, "hash": "9156e64550e6c2e8c4e03c6bcbeb2683a9f46567", "submitter": { "id": 1315, "url": "http://patchwork.ozlabs.org/api/people/1315/?format=api", "name": "Pablo Neira Ayuso", "email": "pablo@netfilter.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260325222615.637793-6-pablo@netfilter.org/mbox/", "series": [ { "id": 497517, "url": "http://patchwork.ozlabs.org/api/series/497517/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=497517", "date": "2026-03-25T22:26:01", "name": "[net,01/14] netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/497517/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216152/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216152/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <netfilter-devel+bounces-11426-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "netfilter-devel@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=netfilter.org header.i=@netfilter.org\n header.a=rsa-sha256 header.s=2025 header.b=WQv4vnTU;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Wed, 25 Mar 2026 22:26:44 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 11F7F39020C;\n\tWed, 25 Mar 2026 22:26:38 +0000 (UTC)", "from mail.netfilter.org (mail.netfilter.org [217.70.190.124])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id E99CB37C91E;\n\tWed, 25 Mar 2026 22:26:35 +0000 (UTC)", "from localhost.localdomain (mail-agni [217.70.190.124])\n\tby mail.netfilter.org (Postfix) with ESMTPSA id DDD5360181;\n\tWed, 25 Mar 2026 23:26:29 +0100 (CET)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1774477597; cv=none;\n b=UJ1suHzqZT1aPZHV/dtJg/PzJ6iVhRWUdgDobF5wD0NPRLwF7IMTJPIl3QCEtPF9Jrcuc57st+TUi5jpLx9aRIrrIQj1R4JZjQ1aZa1jBcmtta7JKmfGuH8MGWhsOkQojJGMAMgsfwSG5GOEM/RaczhvY4zfiFk/0/N9JyFik98=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1774477597; c=relaxed/simple;\n\tbh=kg1OayMZV+GDtLjuLidMVS9iNPpBQZ69aqy5dc4Q6WI=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=NHRJweIVJKLwnyJ6cY5sGBX/hB6YphHOi+Ps1bbK//Y9hrmN2YYzF9bgHRoqFXSTqFGtXxQqpdz0nD9Ujet//w9SUS4yrpWlJix+wwD4aqjv3zGt7H7iGvnqroLsIEUizKRTNQWB92VTwebbKB6R1wsl4YC3PFZfJd2TPmOKukA=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=netfilter.org;\n spf=pass smtp.mailfrom=netfilter.org;\n dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org\n header.b=WQv4vnTU; arc=none smtp.client-ip=217.70.190.124", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=netfilter.org;\n\ts=2025; t=1774477590;\n\tbh=cVccOpvjmCnsd1Ql2RpElCCheT0DBWh3gcduTvNEq8o=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=WQv4vnTUbJuvQUOtZlIufGw3Q/qPfyAVTOdsVPSA64F/RxrccvazDQ/pHvHDXuwaz\n\t xcxmnONjf7xJnvBi6X2F6/dOjhJuBbnhMTTrKr+hTbyLJ4pQ/OMeaHyec6JSzq2K2c\n\t tu4426j2NOpZ7Pz34+jTCDObb7scKG3T03sIGfD60xuIZ2z2wC94mIs+ZBrhvZ2+Xh\n\t 528G7m2rwcb+qfDOh2xEgf/GVK7wzDR/MtqgIMcq9YEtW5jT5l4gHnQ1ZZfpz18u/P\n\t acppAmKkBpSNw0sOvtrQpzC6jlIGMJ0aybV4pC/uvbmc11M2Uw6gPOlfQRx1B4jlxW\n\t HKRiJu3Ez7jUg==", "From": "Pablo Neira Ayuso <pablo@netfilter.org>", "To": "netfilter-devel@vger.kernel.org", "Cc": "davem@davemloft.net,\n\tnetdev@vger.kernel.org,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\tedumazet@google.com,\n\tfw@strlen.de,\n\thorms@kernel.org", "Subject": "[PATCH net 05/14] netfilter: x_tables: reject unsupported families in\n xt_check_match/xt_check_target", "Date": "Wed, 25 Mar 2026 23:26:06 +0100", "Message-ID": "<20260325222615.637793-6-pablo@netfilter.org>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260325222615.637793-1-pablo@netfilter.org>", "References": "<20260325222615.637793-1-pablo@netfilter.org>", "Precedence": "bulk", "X-Mailing-List": "netfilter-devel@vger.kernel.org", "List-Id": "<netfilter-devel.vger.kernel.org>", "List-Subscribe": "<mailto:netfilter-devel+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "From: Weiming Shi <bestswngs@gmail.com>\n\nxt_match and xt_target structs registered with NFPROTO_UNSPEC can be\nloaded by any protocol family through nft_compat. When such a\nmatch/target sets .hooks to restrict which hooks it may run on, the\nbitmask uses NF_INET_* constants. This is only correct for families\nwhose hook layout matches NF_INET_*: IPv4, IPv6, INET, and bridge\nall share the same five hooks (PRE_ROUTING ... POST_ROUTING).\n\nARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different\nsemantics. Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks\nvalidation silently passes for the wrong reasons, allowing matches to\nrun on ARP chains where the hook assumptions (e.g. state->in being\nset on input hooks) do not hold. This leads to NULL pointer\ndereferences; xt_devgroup is one concrete example:\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227]\n RIP: 0010:devgroup_mt+0xff/0x350\n Call Trace:\n <TASK>\n nft_match_eval (net/netfilter/nft_compat.c:407)\n nft_do_chain (net/netfilter/nf_tables_core.c:285)\n nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61)\n nf_hook_slow (net/netfilter/core.c:623)\n arp_xmit (net/ipv4/arp.c:666)\n </TASK>\n Kernel panic - not syncing: Fatal exception in interrupt\n\nAdd a helper xt_family_has_inet_hooks() and call it from both\nxt_check_match() and xt_check_target(): when a UNSPEC match/target\ndeclares .hooks, reject families whose hook numbering differs from\nthe NF_INET_* scheme.\n\nAlso add .hooks to xt_devgroup so the framework-level check covers it;\npreviously it relied on manual hook validation in checkentry using\nNF_INET_* constants, which suffers from the same collision.\n\nFixes: 9291747f118d (\"netfilter: xtables: add device group match\")\nReported-by: Xiang Mei <xmei5@asu.edu>\nSigned-off-by: Weiming Shi <bestswngs@gmail.com>\nSigned-off-by: Florian Westphal <fw@strlen.de>\nSigned-off-by: Pablo Neira Ayuso <pablo@netfilter.org>\n---\n net/netfilter/x_tables.c | 36 ++++++++++++++++++++++++++++++++++++\n net/netfilter/xt_devgroup.c | 5 +++++\n 2 files changed, 41 insertions(+)", "diff": "diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c\nindex e594b3b7ad82..a600592d0bff 100644\n--- a/net/netfilter/x_tables.c\n+++ b/net/netfilter/x_tables.c\n@@ -477,6 +477,28 @@ int xt_check_proc_name(const char *name, unsigned int size)\n }\n EXPORT_SYMBOL(xt_check_proc_name);\n \n+/*\n+ * Families whose hook numbering follows the NF_INET_* scheme.\n+ * ARP hooks (IN=0, OUT=1, FORWARD=2) use different semantics and\n+ * collide numerically with NF_INET_* values, so UNSPEC matches/targets\n+ * that declare .hooks must not run on ARP (or any other family whose\n+ * hooks do not follow the INET layout).\n+ */\n+static bool xt_family_has_inet_hooks(u_int8_t family)\n+{\n+\tswitch (family) {\n+\tcase NFPROTO_IPV4:\n+\tcase NFPROTO_IPV6:\n+\tcase NFPROTO_BRIDGE:\n+\t\treturn true;\n+\tcase NFPROTO_INET:\n+\t\t/* nftables only */\n+\t\treturn false;\n+\tdefault:\n+\t\treturn false;\n+\t}\n+}\n+\n int xt_check_match(struct xt_mtchk_param *par,\n \t\t unsigned int size, u16 proto, bool inv_proto)\n {\n@@ -501,6 +523,13 @@ int xt_check_match(struct xt_mtchk_param *par,\n \t\t\t\t par->match->table, par->table);\n \t\treturn -EINVAL;\n \t}\n+\tif (par->match->family == NFPROTO_UNSPEC &&\n+\t par->match->hooks &&\n+\t !xt_family_has_inet_hooks(par->family)) {\n+\t\tpr_info_ratelimited(\"%s_tables: %s match: not valid for this family\\n\",\n+\t\t\t\t xt_prefix[par->family], par->match->name);\n+\t\treturn -EINVAL;\n+\t}\n \tif (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) {\n \t\tchar used[64], allow[64];\n \n@@ -1016,6 +1045,13 @@ int xt_check_target(struct xt_tgchk_param *par,\n \t\t\t\t par->target->table, par->table);\n \t\treturn -EINVAL;\n \t}\n+\tif (par->target->family == NFPROTO_UNSPEC &&\n+\t par->target->hooks &&\n+\t !xt_family_has_inet_hooks(par->family)) {\n+\t\tpr_info_ratelimited(\"%s_tables: %s target: not valid for this family\\n\",\n+\t\t\t\t xt_prefix[par->family], par->target->name);\n+\t\treturn -EINVAL;\n+\t}\n \tif (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) {\n \t\tchar used[64], allow[64];\n \ndiff --git a/net/netfilter/xt_devgroup.c b/net/netfilter/xt_devgroup.c\nindex 9520dd00070b..8246bcfd2094 100644\n--- a/net/netfilter/xt_devgroup.c\n+++ b/net/netfilter/xt_devgroup.c\n@@ -62,6 +62,11 @@ static struct xt_match devgroup_mt_reg __read_mostly = {\n \t.checkentry\t= devgroup_mt_checkentry,\n \t.matchsize\t= sizeof(struct xt_devgroup_info),\n \t.family\t\t= NFPROTO_UNSPEC,\n+\t.hooks\t\t= (1 << NF_INET_PRE_ROUTING) |\n+\t\t\t (1 << NF_INET_LOCAL_IN) |\n+\t\t\t (1 << NF_INET_FORWARD) |\n+\t\t\t (1 << NF_INET_LOCAL_OUT) |\n+\t\t\t (1 << NF_INET_POST_ROUTING),\n \t.me\t\t= THIS_MODULE\n };\n \n", "prefixes": [ "net", "05/14" ] }