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GET /api/1.1/patches/2228001/?format=api
{ "id": 2228001, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2228001/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260424190513.32823-10-pablo@netfilter.org/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/1.1/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 }, "msgid": "<20260424190513.32823-10-pablo@netfilter.org>", "date": "2026-04-24T19:05:11", "name": "[net,09/11] ipvs: fixes for the new ip_vs_status info", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "1cdb83e93b264fd2df404220e9ccc75f2888c8ce", "submitter": { "id": 1315, "url": "http://patchwork.ozlabs.org/api/1.1/people/1315/?format=api", "name": "Pablo Neira Ayuso", "email": "pablo@netfilter.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260424190513.32823-10-pablo@netfilter.org/mbox/", "series": [ { "id": 501399, "url": "http://patchwork.ozlabs.org/api/1.1/series/501399/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501399", "date": "2026-04-24T19:05:02", "name": "[net,01/11] netfilter: arp_tables: fix IEEE1394 ARP payload parsing", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501399/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2228001/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2228001/checks/", "tags": {}, "headers": { "Return-Path": "\n <netfilter-devel+bounces-12190-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=lBggQlcg;\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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Fri, 24 Apr 2026 19:06:05 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id B51E53FA5CA;\n\tFri, 24 Apr 2026 19:06:02 +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 6B6963F9F5D;\n\tFri, 24 Apr 2026 19:05:58 +0000 (UTC)", "from localhost.localdomain (mail-agni [217.70.190.124])\n\tby mail.netfilter.org (Postfix) with ESMTPSA id 207DC60286;\n\tFri, 24 Apr 2026 21:05:56 +0200 (CEST)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777057562; cv=none;\n b=ALkFvLWSqCiZ9U1+BKrYRrg/YzZGxB9zySwj35ENqB5f7/5SliJ2RG4LX2MntPyHcspYWe5YHMY/eRmVnCIPkXrG4OfFzr93xryMA9dBgeh45DEDSpsYeQyGHlBUKtD9pQU/OJPj9XhxwF3uOLPJ0z0pEC5IXTahDWAeyb+3DxE=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777057562; c=relaxed/simple;\n\tbh=hZgzmhEjToXletzoXpRa7y1L6IQqzMii/jI3vPT6KaU=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=T+02KPrqWJRSpQi0XqnmAjqJ+kJzRK+MF0AQdJ0IrT5QAox59Va6RZ5CSTwhLBl9RBIMZKR3g6+E6xrq8DAh/3FT2/bpb7PeUkkdXWujokeOh6P5rf12ZN3/I7cTWZkGPDN37Sj60QNEdO/UCH8GlJWc1UIwnFA/UUFYaCZwFDw=", "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=lBggQlcg; 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=1777057556;\n\tbh=KZ+hHLH5dFg4tjTDLe2Ci4yki2ev3zk2D+ngYpFdDxM=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=lBggQlcgEAEPenE0YlDwNhtHMxXvjTl7mxoO8w6e2Z1mF3qMKhsM/qa5gd+Pqe8vW\n\t 2FYIw0m8avpYTukqwJriDwQaa+KNuoNP5ggco9UYUhP3Qj5Xn/6QNsKhEFksmSv2xq\n\t /IglioxtuIlJh1K3UwtZtoQiXEPePYuGuEr6oAhsq/VFaZ6M9q86nuenqN9segZBz0\n\t gmpyBSitnlcmNg0VvFhQLjI9prd3tlcn65g89Pvk590MI/qTYgx4mI++c9RyKiN3Wt\n\t B4FaE2kCJYiHYNriSoO5QayWY0NjeyR+C9HQDFctn0cKhF4tKnqvxN8DwpfjUMGc4K\n\t CobP2aGqKZtAw==", "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 09/11] ipvs: fixes for the new ip_vs_status info", "Date": "Fri, 24 Apr 2026 21:05:11 +0200", "Message-ID": "<20260424190513.32823-10-pablo@netfilter.org>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260424190513.32823-1-pablo@netfilter.org>", "References": "<20260424190513.32823-1-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: Julian Anastasov <ja@ssi.bg>\n\nSashiko reports some problems for the recently added\n/proc/net/ip_vs_status:\n\n* ip_vs_status_show() as a table reader may run long after the\nconn_tab and svc_table table are released. While ip_vs_conn_flush()\nproperly changes the conn_tab_changes counter when conn_tab is removed,\nip_vs_del_service() and ip_vs_flush() were missing such change for\nthe svc_table_changes counter. As result, readers like\nip_vs_dst_event() and ip_vs_status_show() may continue to use\na freed table after a cond_resched_rcu() call.\n\n* While counting the buckets in ip_vs_status_show() make sure we\ntraverse only the needed number of entries in the chain. This also\nprevents possible overflow of the 'count' variable.\n\n* Add check for 'loops' to prevent infinite loops while restarting\nthe traversal on table change.\n\n* While IP_VS_CONN_TAB_MAX_BITS is 20 on 32-bit platforms and\nthere is no risk to overflow when multiplying the number of\nconn_tab buckets to 100, prefer the div_u64() helper to make\nthe following dividing safer.\n\n* Use 0440 permissions for ip_vs_status to restrict the\ninfo only to root due to the exported information for hash\ndistribution.\n\nLink: https://sashiko.dev/#/patchset/20260410112352.23599-1-fw%40strlen.de\nSigned-off-by: Julian Anastasov <ja@ssi.bg>\nSigned-off-by: Pablo Neira Ayuso <pablo@netfilter.org>\n---\n net/netfilter/ipvs/ip_vs_ctl.c | 51 ++++++++++++++++++++++++----------\n 1 file changed, 36 insertions(+), 15 deletions(-)", "diff": "diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c\nindex 6632daa87ded..27e50afe9a54 100644\n--- a/net/netfilter/ipvs/ip_vs_ctl.c\n+++ b/net/netfilter/ipvs/ip_vs_ctl.c\n@@ -2032,6 +2032,9 @@ static int ip_vs_del_service(struct ip_vs_service *svc)\n \t\tcancel_delayed_work_sync(&ipvs->svc_resize_work);\n \t\tif (t) {\n \t\t\trcu_assign_pointer(ipvs->svc_table, NULL);\n+\t\t\t/* Inform readers that table is removed */\n+\t\t\tsmp_mb__before_atomic();\n+\t\t\tatomic_inc(&ipvs->svc_table_changes);\n \t\t\twhile (1) {\n \t\t\t\tp = rcu_dereference_protected(t->new_tbl, 1);\n \t\t\t\tcall_rcu(&t->rcu_head, ip_vs_rht_rcu_free);\n@@ -2078,6 +2081,9 @@ static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)\n \tt = rcu_dereference_protected(ipvs->svc_table, 1);\n \tif (t) {\n \t\trcu_assign_pointer(ipvs->svc_table, NULL);\n+\t\t/* Inform readers that table is removed */\n+\t\tsmp_mb__before_atomic();\n+\t\tatomic_inc(&ipvs->svc_table_changes);\n \t\twhile (1) {\n \t\t\tp = rcu_dereference_protected(t->new_tbl, 1);\n \t\t\tcall_rcu(&t->rcu_head, ip_vs_rht_rcu_free);\n@@ -3004,7 +3010,8 @@ static int ip_vs_status_show(struct seq_file *seq, void *v)\n \tint old_gen, new_gen;\n \tu32 counts[8];\n \tu32 bucket;\n-\tint count;\n+\tu32 count;\n+\tint loops;\n \tu32 sum1;\n \tu32 sum;\n \tint i;\n@@ -3020,6 +3027,7 @@ static int ip_vs_status_show(struct seq_file *seq, void *v)\n \tif (!atomic_read(&ipvs->conn_count))\n \t\tgoto after_conns;\n \told_gen = atomic_read(&ipvs->conn_tab_changes);\n+\tloops = 0;\n \n repeat_conn:\n \tsmp_rmb(); /* ipvs->conn_tab and conn_tab_changes */\n@@ -3032,8 +3040,11 @@ static int ip_vs_status_show(struct seq_file *seq, void *v)\n \t\t\tresched_score++;\n \t\t\tip_vs_rht_walk_bucket_rcu(t, bucket, head) {\n \t\t\t\tcount = 0;\n-\t\t\t\thlist_bl_for_each_entry_rcu(hn, e, head, node)\n+\t\t\t\thlist_bl_for_each_entry_rcu(hn, e, head, node) {\n \t\t\t\t\tcount++;\n+\t\t\t\t\tif (count >= ARRAY_SIZE(counts) - 1)\n+\t\t\t\t\t\tbreak;\n+\t\t\t\t}\n \t\t\t}\n \t\t\tresched_score += count;\n \t\t\tif (resched_score >= 100) {\n@@ -3042,37 +3053,41 @@ static int ip_vs_status_show(struct seq_file *seq, void *v)\n \t\t\t\tnew_gen = atomic_read(&ipvs->conn_tab_changes);\n \t\t\t\t/* New table installed ? */\n \t\t\t\tif (old_gen != new_gen) {\n+\t\t\t\t\t/* Too many changes? */\n+\t\t\t\t\tif (++loops >= 5)\n+\t\t\t\t\t\tgoto after_conns;\n \t\t\t\t\told_gen = new_gen;\n \t\t\t\t\tgoto repeat_conn;\n \t\t\t\t}\n \t\t\t}\n-\t\t\tcounts[min(count, (int)ARRAY_SIZE(counts) - 1)]++;\n+\t\t\tcounts[count]++;\n \t\t}\n \t}\n \tfor (sum = 0, i = 0; i < ARRAY_SIZE(counts); i++)\n \t\tsum += counts[i];\n \tsum1 = sum - counts[0];\n-\tseq_printf(seq, \"Conn buckets empty:\\t%u (%lu%%)\\n\",\n-\t\t counts[0], (unsigned long)counts[0] * 100 / max(sum, 1U));\n+\tseq_printf(seq, \"Conn buckets empty:\\t%u (%llu%%)\\n\",\n+\t\t counts[0], div_u64((u64)counts[0] * 100U, max(sum, 1U)));\n \tfor (i = 1; i < ARRAY_SIZE(counts); i++) {\n \t\tif (!counts[i])\n \t\t\tcontinue;\n-\t\tseq_printf(seq, \"Conn buckets len-%d:\\t%u (%lu%%)\\n\",\n+\t\tseq_printf(seq, \"Conn buckets len-%d:\\t%u (%llu%%)\\n\",\n \t\t\t i, counts[i],\n-\t\t\t (unsigned long)counts[i] * 100 / max(sum1, 1U));\n+\t\t\t div_u64((u64)counts[i] * 100U, max(sum1, 1U)));\n \t}\n \n after_conns:\n \tt = rcu_dereference(ipvs->svc_table);\n \n \tcount = ip_vs_get_num_services(ipvs);\n-\tseq_printf(seq, \"Services:\\t%d\\n\", count);\n+\tseq_printf(seq, \"Services:\\t%u\\n\", count);\n \tseq_printf(seq, \"Service buckets:\\t%d (%d bits, lfactor %d)\\n\",\n \t\t t ? t->size : 0, t ? t->bits : 0, t ? t->lfactor : 0);\n \n \tif (!count)\n \t\tgoto after_svc;\n \told_gen = atomic_read(&ipvs->svc_table_changes);\n+\tloops = 0;\n \n repeat_svc:\n \tsmp_rmb(); /* ipvs->svc_table and svc_table_changes */\n@@ -3086,8 +3101,11 @@ static int ip_vs_status_show(struct seq_file *seq, void *v)\n \t\t\tip_vs_rht_walk_bucket_rcu(t, bucket, head) {\n \t\t\t\tcount = 0;\n \t\t\t\thlist_bl_for_each_entry_rcu(svc, e, head,\n-\t\t\t\t\t\t\t s_list)\n+\t\t\t\t\t\t\t s_list) {\n \t\t\t\t\tcount++;\n+\t\t\t\t\tif (count >= ARRAY_SIZE(counts) - 1)\n+\t\t\t\t\t\tbreak;\n+\t\t\t\t}\n \t\t\t}\n \t\t\tresched_score += count;\n \t\t\tif (resched_score >= 100) {\n@@ -3096,24 +3114,27 @@ static int ip_vs_status_show(struct seq_file *seq, void *v)\n \t\t\t\tnew_gen = atomic_read(&ipvs->svc_table_changes);\n \t\t\t\t/* New table installed ? */\n \t\t\t\tif (old_gen != new_gen) {\n+\t\t\t\t\t/* Too many changes? */\n+\t\t\t\t\tif (++loops >= 5)\n+\t\t\t\t\t\tgoto after_svc;\n \t\t\t\t\told_gen = new_gen;\n \t\t\t\t\tgoto repeat_svc;\n \t\t\t\t}\n \t\t\t}\n-\t\t\tcounts[min(count, (int)ARRAY_SIZE(counts) - 1)]++;\n+\t\t\tcounts[count]++;\n \t\t}\n \t}\n \tfor (sum = 0, i = 0; i < ARRAY_SIZE(counts); i++)\n \t\tsum += counts[i];\n \tsum1 = sum - counts[0];\n-\tseq_printf(seq, \"Service buckets empty:\\t%u (%lu%%)\\n\",\n-\t\t counts[0], (unsigned long)counts[0] * 100 / max(sum, 1U));\n+\tseq_printf(seq, \"Service buckets empty:\\t%u (%llu%%)\\n\",\n+\t\t counts[0], div_u64((u64)counts[0] * 100U, max(sum, 1U)));\n \tfor (i = 1; i < ARRAY_SIZE(counts); i++) {\n \t\tif (!counts[i])\n \t\t\tcontinue;\n-\t\tseq_printf(seq, \"Service buckets len-%d:\\t%u (%lu%%)\\n\",\n+\t\tseq_printf(seq, \"Service buckets len-%d:\\t%u (%llu%%)\\n\",\n \t\t\t i, counts[i],\n-\t\t\t (unsigned long)counts[i] * 100 / max(sum1, 1U));\n+\t\t\t div_u64((u64)counts[i] * 100U, max(sum1, 1U)));\n \t}\n \n after_svc:\n@@ -5039,7 +5060,7 @@ int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)\n \t\t\t\t ipvs->net->proc_net,\n \t\t\t\t ip_vs_stats_percpu_show, NULL))\n \t\tgoto err_percpu;\n-\tif (!proc_create_net_single(\"ip_vs_status\", 0, ipvs->net->proc_net,\n+\tif (!proc_create_net_single(\"ip_vs_status\", 0440, ipvs->net->proc_net,\n \t\t\t\t ip_vs_status_show, NULL))\n \t\tgoto err_status;\n #endif\n", "prefixes": [ "net", "09/11" ] }