AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/11/02 05:55	flow	patch-triage	10m Args: null Results: { "EnableConfigs": [ "NETFILTER", "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_CONNTRACK", "NF_CT_NETLINK", "NF_CONNTRACK_SIP", "NF_TABLES", "NETFILTER_NETLINK_QUEUE", "NF_REJECT_IPV4", "NF_REJECT_IPV6", "NF_FLOW_TABLE", "NF_CONNTRACK_BRIDGE", "NETFILTER_XT_MATCH_RECENT", "NETFILTER_XT_TARGET_NETMAP", "DEBUG_NET" ], "FocusSymbols": [ "nf_send_reset", "nf_send_reset6", "nf_ct_expect_alloc", "ctnetlink_find_get_master", "ctnetlink_create_conntrack", "ctnetlink_create_expect", "nf_reinject", "__nf_queue", "ip_vs_add_dest", "ip_vs_del_dest", "ip_vs_del_service", "ip_vs_flush", "ip_vs_new_conn_out", "tcp_conn_schedule", "udp_conn_schedule", "sctp_conn_schedule", "nft_delrule", "nft_flow_rule_destroy", "nft_rbtree_gc_queue", "ct_sip_parse_transport", "recent_proc_net_exit" ], "KMSANReasoning": "The patch series consists of various bug fixes and hardening across Netfilter, IPVS, and related subsystems:\n\n1. Uninitialized Memory Fixes (nf_nat_masquerade.c, xt_NETMAP.c):\nThe changes replace partial memsets of min_addr/max_addr with full `memset(\u0026newrange, 0, sizeof(newrange))`, properly zeroing the entire stack struct (including `base_proto`). These changes remediate existing uninitialized stack variable reads rather than introducing them.\n\n2. Target Verdict Check (arp_tables.c, ip_tables.c, ip6_tables.c):\nIn `mark_source_chains()`, `t-\u003everdict` is now read only after verifying `strcmp(...) == 0` for XT_STANDARD_TARGET, preventing non-standard targets from being interpreted as `xt_standard_target`. The local variable `newpos` is assigned deterministically in both branches of the conditional, ensuring no uninitialized read occurs.\n\n3. IPVS and RCU Handling (ip_vs_*.c, include/net/ip_vs.h):\nNew fields `rcu_state` and `need_gp` added to `struct ip_vs_dest` are fully zero-initialized via `kzalloc_obj` at allocation time and are purely internal kernel state. The change from `kfree` to `kfree_rcu` fixes a use-after-free race condition, which falls squarely under KASAN's detection capabilities. Module init/cleanup reordering and port 0 validation address lifecycle and logic issues.\n\n4. Netfilter Queue Entry (nf_queue.c, nfnetlink_queue.c, nf_queue.h):\nThe new `in_nf_duplicate` boolean on `struct nf_queue_entry` is initialized via designated initializer struct literal during allocation and is not exported to userspace.\n\n5. Other Subsystem Changes:\nRecursion limit guards (`nf_dev_xmit_recursion`) protect against stack overflow / infinite loops. Length checking in `nf_conntrack_sip` prevents out-of-bounds reads (covered by KASAN). The NULL check in `nft_rbtree_gc_queue` prevents NULL pointer dereference, and replacing a spinlock with a mutex in `xt_recent` prevents sleeping-while-atomic bugs (covered by LOCKDEP).\n\nNone of the changes introduce risks of uninitialized memory reads, uninitialized branching, or kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and existing kernel assertions are fully equipped to catch any potential regressions. A dedicated KMSAN run is not warranted.", "NeedsKMSAN": false, "Reasoning": "The patch series touches several core Netfilter and IPVS subsystems. It introduces recursion tracking into IPv4 and IPv6 reset packet generation, bounds conntrack expectation chains, adds RCU grace period synchronization and lockdep assertions when rehashing and trashing IPVS destinations, saves and validates packet duplication flags across nfqueue reinjection with DEBUG_NET_WARN_ONCE, fixes locking in xt_recent netns teardown, and handles port 0 validation in IPVS protocol schedulers. All modified paths are reachable via standard networking syscalls, netlink, and network namespaces. Fuzzing is warranted to test new invariants, assertions, and concurrency semantics.", "WorthFuzzing": true }
1/1	2026/11/02 05:55	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit d8d758cd343442f0e384a65ddedcc65a14ae3601\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Nov 2 05:55:08 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/linux/netdevice_xmit.h b/include/linux/netdevice_xmit.h\nindex cc232508e695ee..286ae5a6101e8c 100644\n--- a/include/linux/netdevice_xmit.h\n+++ b/include/linux/netdevice_xmit.h\n@@ -18,8 +18,8 @@ struct netdev_xmit {\n \tu8\t\t\tsched_mirred_nest;\n \tstruct net_device\tsched_mirred_dev[MIRRED_NEST_LIMIT];\n #endif\n-#if IS_ENABLED(CONFIG_NF_DUP_NETDEV)\n-\tu8 nf_dup_skb_recursion;\n+#if IS_ENABLED(CONFIG_NETFILTER)\n+\tu8 nf_xmit_skb_recursion;\n #endif\n };\n \ndiff --git a/include/net/ip_vs.h b/include/net/ip_vs.h\nindex 9a83bff32569da..50a2999beb01fe 100644\n--- a/include/net/ip_vs.h\n+++ b/include/net/ip_vs.h\n@@ -1021,7 +1021,9 @@ struct ip_vs_dest {\n \n \tstruct rcu_head\t\trcu_head;\n \tstruct list_head\tt_list;\t\t/ in dest_trash /\n-\tunsigned int\t\tin_rs_table:1;\t/ we are in rs_table /\n+\tunsigned long\t\trcu_state;\t/ GP cookie when trashed /\n+\tunsigned int\t\tin_rs_table:1,\t/ we are in rs_table /\n+\t\t\t\tneed_gp:1;\t/ Need GP on rehash /\n };\n \n / The scheduler object /\ndiff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h\nindex 335b8c43694f8e..617178fd4d8bc3 100644\n--- a/include/net/netfilter/nf_conntrack_helper.h\n+++ b/include/net/netfilter/nf_conntrack_helper.h\n@@ -29,6 +29,8 @@ enum nf_ct_helper_flags {\n \n #define NF_CT_HELPER_NAME_LEN\t16\n \n+#define NF_CT_MAX_EXPECT_CHAIN_LEN\t2\n+\n / Must be kept in sync with the classes defined by helpers /\n #define NF_CT_MAX_EXPECT_CLASSES\t4\n \n@@ -159,6 +161,19 @@ static inline void nf_ct_help_put(const struct nf_conn ct)\n \t\tkfree_rcu(helper, rcu);\n }\n \n+static inline bool nf_ct_master_acceptable(const struct nf_conn m)\n+{\n+\tunsigned int depth = 0;\n+\n+\twhile (m-\u003emaster) {\n+\t\tif (++depth \u003e= NF_CT_MAX_EXPECT_CHAIN_LEN)\n+\t\t\treturn false;\n+\t\tm = m-\u003emaster;\n+\t}\n+\n+\treturn true;\n+}\n+\n int nf_conntrack_helper_init(void);\n void nf_conntrack_helper_fini(void);\n \ndiff --git a/include/net/netfilter/nf_dup_netdev.h b/include/net/netfilter/nf_dup_netdev.h\nindex f6b05bd80c3fe3..a394112646144e 100644\n--- a/include/net/netfilter/nf_dup_netdev.h\n+++ b/include/net/netfilter/nf_dup_netdev.h\n@@ -9,41 +9,6 @@\n void nf_dup_netdev_egress(const struct nft_pktinfo pkt, int oif);\n void nf_fwd_netdev_egress(const struct nft_pktinfo pkt, int oif);\n \n-#define NF_RECURSION_LIMIT\t2\n-\n-#ifndef CONFIG_PREEMPT_RT\n-static inline bool nf_dev_xmit_recursion(void)\n-{\n-\treturn unlikely(__this_cpu_read(softnet_data.xmit.nf_dup_skb_recursion) \u003e\n-\t\t\tNF_RECURSION_LIMIT);\n-}\n-\n-static inline void nf_dev_xmit_recursion_inc(void)\n-{\n-\t__this_cpu_inc(softnet_data.xmit.nf_dup_skb_recursion);\n-}\n-\n-static inline void nf_dev_xmit_recursion_dec(void)\n-{\n-\t__this_cpu_dec(softnet_data.xmit.nf_dup_skb_recursion);\n-}\n-#else\n-static inline bool nf_dev_xmit_recursion(void)\n-{\n-\treturn unlikely(current-\u003enet_xmit.nf_dup_skb_recursion \u003e NF_RECURSION_LIMIT);\n-}\n-\n-static inline void nf_dev_xmit_recursion_inc(void)\n-{\n-\tcurrent-\u003enet_xmit.nf_dup_skb_recursion++;\n-}\n-\n-static inline void nf_dev_xmit_recursion_dec(void)\n-{\n-\tcurrent-\u003enet_xmit.nf_dup_skb_recursion--;\n-}\n-#endif\n-\n struct nft_offload_ctx;\n struct nft_flow_rule;\n \ndiff --git a/include/net/netfilter/nf_queue.h b/include/net/netfilter/nf_queue.h\nindex 86021c55ba3ce9..4a8cefd8398d79 100644\n--- a/include/net/netfilter/nf_queue.h\n+++ b/include/net/netfilter/nf_queue.h\n@@ -23,6 +23,7 @@ struct nf_queue_entry {\n \tstruct net_device\tphysout;\n #endif\n \tstruct nf_hook_state\tstate;\n+\tbool\t\t\tin_nf_duplicate;\n \tbool\t\t\tnf_ct_is_unconfirmed;\n \tu16\t\t\tsize; /* sizeof(entry) + saved route keys /\n \ndiff --git a/include/net/netfilter/nf_recursion.h b/include/net/netfilter/nf_recursion.h\nnew file mode 100644\nindex 00000000000000..1ac65f7793f197\n--- /dev/null\n+++ b/include/net/netfilter/nf_recursion.h\n@@ -0,0 +1,42 @@\n+/ SPDX-License-Identifier: GPL-2.0 /\n+#ifndef _NF_RECURSION_H_\n+#define _NF_RECURSION_H_\n+\n+#include \u003clinux/netdevice.h\u003e\n+\n+#define NF_RECURSION_LIMIT\t2\n+\n+#ifndef CONFIG_PREEMPT_RT\n+static inline bool nf_dev_xmit_recursion(void)\n+{\n+\treturn unlikely(__this_cpu_read(softnet_data.xmit.nf_xmit_skb_recursion) \u003e\n+\t\t\tNF_RECURSION_LIMIT);\n+}\n+\n+static inline void nf_dev_xmit_recursion_inc(void)\n+{\n+\t__this_cpu_inc(softnet_data.xmit.nf_xmit_skb_recursion);\n+}\n+\n+static inline void nf_dev_xmit_recursion_dec(void)\n+{\n+\t__this_cpu_dec(softnet_data.xmit.nf_xmit_skb_recursion);\n+}\n+#else\n+static inline bool nf_dev_xmit_recursion(void)\n+{\n+\treturn unlikely(current-\u003enet_xmit.nf_xmit_skb_recursion \u003e NF_RECURSION_LIMIT);\n+}\n+\n+static inline void nf_dev_xmit_recursion_inc(void)\n+{\n+\tcurrent-\u003enet_xmit.nf_xmit_skb_recursion++;\n+}\n+\n+static inline void nf_dev_xmit_recursion_dec(void)\n+{\n+\tcurrent-\u003enet_xmit.nf_xmit_skb_recursion--;\n+}\n+#endif\n+\n+#endif / _NF_RECURSION_H_ /\ndiff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c\nindex b5444335b86f2b..8c83dc05114ba7 100644\n--- a/net/bridge/netfilter/nf_conntrack_bridge.c\n+++ b/net/bridge/netfilter/nf_conntrack_bridge.c\n@@ -358,7 +358,7 @@ nf_ct_bridge_refrag(struct sk_buff skb, const struct nf_hook_state state,\n \t\tnf_br_ip6_fragment(state-\u003enet, state-\u003esk, skb, \u0026data, output);\n \t\tbreak;\n \tdefault:\n-\t\tWARN_ON_ONCE(1);\n+\t\tDEBUG_NET_WARN_ON_ONCE(1);\n \t\treturn NF_DROP;\n \t}\n \ndiff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c\nindex cf747e1e17a363..7ff3d1f0ffd411 100644\n--- a/net/ipv4/netfilter/arp_tables.c\n+++ b/net/ipv4/netfilter/arp_tables.c\n@@ -371,11 +371,12 @@ static int mark_source_chains(const struct xt_table_info newinfo,\n \t\t\t\te-\u003ecounters.pcnt = pos;\n \t\t\t\tpos += size;\n \t\t\t} else {\n-\t\t\t\tint newpos = t-\u003everdict;\n+\t\t\t\tint newpos;\n \n \t\t\t\tif (strcmp(t-\u003etarget.u.user.name,\n \t\t\t\t\t XT_STANDARD_TARGET) == 0 \u0026\u0026\n-\t\t\t\t newpos \u003e= 0) {\n+\t\t\t\t t-\u003everdict \u003e= 0) {\n+\t\t\t\t\tnewpos = t-\u003everdict;\n \t\t\t\t\t/* This a jump; chase it. /\n \t\t\t\t\tif (!xt_find_jump_offset(offsets, newpos,\n \t\t\t\t\t\t\t\t newinfo-\u003enumber))\ndiff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c\nindex 809441cedcedc7..b302bd77180a75 100644\n--- a/net/ipv4/netfilter/ip_tables.c\n+++ b/net/ipv4/netfilter/ip_tables.c\n@@ -422,11 +422,12 @@ mark_source_chains(const struct xt_table_info newinfo,\n \t\t\t\te-\u003ecounters.pcnt = pos;\n \t\t\t\tpos += size;\n \t\t\t} else {\n-\t\t\t\tint newpos = t-\u003everdict;\n+\t\t\t\tint newpos;\n \n \t\t\t\tif (strcmp(t-\u003etarget.u.user.name,\n \t\t\t\t\t XT_STANDARD_TARGET) == 0 \u0026\u0026\n-\t\t\t\t newpos \u003e= 0) {\n+\t\t\t\t t-\u003everdict \u003e= 0) {\n+\t\t\t\t\tnewpos = t-\u003everdict;\n \t\t\t\t\t/* This a jump; chase it. /\n \t\t\t\t\tif (!xt_find_jump_offset(offsets, newpos,\n \t\t\t\t\t\t\t\t newinfo-\u003enumber))\ndiff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c\nindex 7cb33af671e260..4082fa184af8ba 100644\n--- a/net/ipv4/netfilter/nf_reject_ipv4.c\n+++ b/net/ipv4/netfilter/nf_reject_ipv4.c\n@@ -10,6 +10,7 @@\n #include \u003cnet/dst.h\u003e\n #include \u003cnet/dst_metadata.h\u003e\n #include \u003cnet/netfilter/ipv4/nf_reject.h\u003e\n+#include \u003cnet/netfilter/nf_recursion.h\u003e\n #include \u003clinux/netfilter_ipv4.h\u003e\n #include \u003clinux/netfilter_bridge.h\u003e\n \n@@ -336,7 +337,18 @@ void nf_send_reset(struct net net, struct sock sk, struct sk_buff oldskb,\n \t\tdev_queue_xmit(nskb);\n \t} else\n #endif\n+\t{\n+\t\tlocal_bh_disable();\n+\t\tif (nf_dev_xmit_recursion()) {\n+\t\t\tlocal_bh_enable();\n+\t\t\tgoto free_nskb;\n+\t\t}\n+\n+\t\tnf_dev_xmit_recursion_inc();\n \t\tip_local_out(net, nskb-\u003esk, nskb);\n+\t\tnf_dev_xmit_recursion_dec();\n+\t\tlocal_bh_enable();\n+\t}\n \n \treturn;\n \ndiff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c\nindex 313c4aac377aa2..010baaa6066573 100644\n--- a/net/ipv6/netfilter/ip6_tables.c\n+++ b/net/ipv6/netfilter/ip6_tables.c\n@@ -440,11 +440,12 @@ mark_source_chains(const struct xt_table_info newinfo,\n \t\t\t\te-\u003ecounters.pcnt = pos;\n \t\t\t\tpos += size;\n \t\t\t} else {\n-\t\t\t\tint newpos = t-\u003everdict;\n+\t\t\t\tint newpos;\n \n \t\t\t\tif (strcmp(t-\u003etarget.u.user.name,\n \t\t\t\t\t XT_STANDARD_TARGET) == 0 \u0026\u0026\n-\t\t\t\t newpos \u003e= 0) {\n+\t\t\t\t t-\u003everdict \u003e= 0) {\n+\t\t\t\t\tnewpos = t-\u003everdict;\n \t\t\t\t\t/ This a jump; chase it. /\n \t\t\t\t\tif (!xt_find_jump_offset(offsets, newpos,\n \t\t\t\t\t\t\t\t newinfo-\u003enumber))\ndiff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c\nindex 5e08d8529cc889..7c94641845175c 100644\n--- a/net/ipv6/netfilter/nf_reject_ipv6.c\n+++ b/net/ipv6/netfilter/nf_reject_ipv6.c\n@@ -10,6 +10,7 @@\n #include \u003cnet/ip6_checksum.h\u003e\n #include \u003cnet/dst_metadata.h\u003e\n #include \u003cnet/netfilter/ipv6/nf_reject.h\u003e\n+#include \u003cnet/netfilter/nf_recursion.h\u003e\n #include \u003clinux/netfilter_ipv6.h\u003e\n #include \u003clinux/netfilter_bridge.h\u003e\n \n@@ -409,7 +410,19 @@ void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb,\n \t\tdev_queue_xmit(nskb);\n \t} else\n #endif\n+\t{\n+\t\tlocal_bh_disable();\n+\t\tif (nf_dev_xmit_recursion()) {\n+\t\t\tlocal_bh_enable();\n+\t\t\tkfree_skb(nskb);\n+\t\t\treturn;\n+\t\t}\n+\n+\t\tnf_dev_xmit_recursion_inc();\n \t\tip6_local_out(net, sk, nskb);\n+\t\tnf_dev_xmit_recursion_dec();\n+\t\tlocal_bh_enable();\n+\t}\n }\n EXPORT_SYMBOL_GPL(nf_send_reset6);\n \ndiff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c\nindex 11cbdbaf561daf..2c1b47702da213 100644\n--- a/net/netfilter/ipvs/ip_vs_app.c\n+++ b/net/netfilter/ipvs/ip_vs_app.c\n@@ -242,7 +242,7 @@ void unregister_ip_vs_app(struct netns_ipvs ipvs, struct ip_vs_app app)\n \t\t}\n \n \t\tlist_del(\u0026a-\u003ea_list);\n-\t\tkfree(a);\n+\t\tkfree_rcu(a, rcu_head);\n \n \t\t/* decrease the module use count /\n \t\tip_vs_use_count_dec();\ndiff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c\nindex fd503f0efb5783..f3eb72e95024dd 100644\n--- a/net/netfilter/ipvs/ip_vs_core.c\n+++ b/net/netfilter/ipvs/ip_vs_core.c\n@@ -1305,6 +1305,7 @@ static inline bool is_new_conn_expected(const struct ip_vs_conn cp,\n * In fwmark-VS actual vaddr and vport are unknown to IPVS\n * 2) Real Server and Virtual Service were NOT configured without port:\n * This is to allow match of different VS to the same RS ip-addr\n+ * 3) Client port is not 0\n /\n struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc,\n \t\t\t\t struct ip_vs_dest dest,\n@@ -1328,7 +1329,7 @@ struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc,\n \t/* check pre-requisites are satisfied /\n \tif (svc-\u003efwmark)\n \t\treturn NULL;\n-\tif (!vport \|\| !dport)\n+\tif (!vport \|\| !dport \|\| !cport)\n \t\treturn NULL;\n \n \t/ for persistent service first create connection template /\n@@ -2502,12 +2503,12 @@ static int __net_init __ip_vs_init(struct net net)\n \tif (ip_vs_estimator_net_init(ipvs) \u003c 0)\n \t\tgoto estimator_fail;\n \n-\tif (ip_vs_control_net_init(ipvs) \u003c 0)\n-\t\tgoto control_fail;\n-\n \tif (ip_vs_protocol_net_init(ipvs) \u003c 0)\n \t\tgoto protocol_fail;\n \n+\tif (ip_vs_control_net_init(ipvs) \u003c 0)\n+\t\tgoto control_fail;\n+\n \tif (ip_vs_app_net_init(ipvs) \u003c 0)\n \t\tgoto app_fail;\n \n@@ -2527,10 +2528,10 @@ static int __net_init __ip_vs_init(struct net net)\n conn_fail:\n \tip_vs_app_net_cleanup(ipvs);\n app_fail:\n-\tip_vs_protocol_net_cleanup(ipvs);\n-protocol_fail:\n \tip_vs_control_net_cleanup(ipvs);\n control_fail:\n+\tip_vs_protocol_net_cleanup(ipvs);\n+protocol_fail:\n \tip_vs_estimator_net_cleanup(ipvs);\n estimator_fail:\n \tnet-\u003eipvs = NULL;\n@@ -2547,8 +2548,8 @@ static void __net_exit __ip_vs_cleanup_batch(struct list_head net_list)\n \t\tipvs = net_ipvs(net);\n \t\tip_vs_conn_net_cleanup(ipvs);\n \t\tip_vs_app_net_cleanup(ipvs);\n-\t\tip_vs_protocol_net_cleanup(ipvs);\n \t\tip_vs_control_net_cleanup(ipvs);\n+\t\tip_vs_protocol_net_cleanup(ipvs);\n \t\tip_vs_estimator_net_cleanup(ipvs);\n \t\tIP_VS_DBG(2, \"ipvs netns %d released\\n\", ipvs-\u003egen);\n \t\tnet-\u003eipvs = NULL;\ndiff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c\nindex ce9fe20d6106a8..7f10cf5b48c7f3 100644\n--- a/net/netfilter/ipvs/ip_vs_ctl.c\n+++ b/net/netfilter/ipvs/ip_vs_ctl.c\n@@ -64,7 +64,8 @@ int ip_vs_get_debug_level(void)\n \n \n /* Protos /\n-static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup);\n+static void __ip_vs_del_service(struct ip_vs_service svc,\n+\t\t\t\tstruct list_head dest_trash, bool cleanup);\n \n \n #ifdef CONFIG_IP_VS_IPV6\n@@ -918,6 +919,11 @@ static void ip_vs_rs_hash(struct netns_ipvs ipvs, struct ip_vs_dest dest)\n \t /\n \thash = ip_vs_rs_hashkey(dest-\u003eaf, \u0026dest-\u003eaddr, port);\n \n+\t/ Need RCU grace period when rehashing /\n+\tif (dest-\u003eneed_gp) {\n+\t\tcond_synchronize_rcu(dest-\u003ercu_state);\n+\t\tdest-\u003eneed_gp = 0;\n+\t}\n \thlist_add_head_rcu(\u0026dest-\u003ed_list, \u0026ipvs-\u003ers_table[hash]);\n \tdest-\u003ein_rs_table = 1;\n }\n@@ -1111,6 +1117,8 @@ ip_vs_trash_get_dest(struct ip_vs_service svc, int dest_af,\n \tstruct ip_vs_dest dest;\n \tstruct netns_ipvs ipvs = svc-\u003eipvs;\n \n+\tlockdep_assert_held(\u0026ipvs-\u003eservice_mutex);\n+\n \t/\n \t Find the destination in trash\n \t /\n@@ -1144,24 +1152,57 @@ ip_vs_trash_get_dest(struct ip_vs_service svc, int dest_af,\n \treturn dest;\n }\n \n-/* Put destination in trash /\n-static void ip_vs_trash_put_dest(struct netns_ipvs ipvs,\n+/* Add destination in temp list for trash /\n+static void ip_vs_trash_add_dest(struct netns_ipvs ipvs,\n \t\t\t\t struct ip_vs_dest dest, unsigned long istart,\n-\t\t\t\t bool cleanup)\n+\t\t\t\t struct list_head dest_trash)\n {\n-\tspin_lock_bh(\u0026ipvs-\u003edest_trash_lock);\n \tIP_VS_DBG_BUF(3, \"Moving dest %s:%u into trash, dest-\u003erefcnt=%d\\n\",\n \t\t IP_VS_DBG_ADDR(dest-\u003eaf, \u0026dest-\u003eaddr), ntohs(dest-\u003eport),\n \t\t refcount_read(\u0026dest-\u003erefcnt));\n+\t/* dest lives in trash with reference /\n+\tlist_add(\u0026dest-\u003et_list, dest_trash);\n+\tdest-\u003eidle_start = istart;\n+}\n+\n+/ Put destinations in trash /\n+static void ip_vs_trash_put_dests(struct netns_ipvs ipvs,\n+\t\t\t\t struct list_head dest_trash, bool cleanup)\n+{\n+\tspin_lock_bh(\u0026ipvs-\u003edest_trash_lock);\n \tif (list_empty(\u0026ipvs-\u003edest_trash) \u0026\u0026 !cleanup)\n \t\tmod_timer(\u0026ipvs-\u003edest_trash_timer,\n \t\t\t jiffies + (IP_VS_DEST_TRASH_PERIOD \u003e\u003e 1));\n-\t/ dest lives in trash with reference /\n-\tlist_add(\u0026dest-\u003et_list, \u0026ipvs-\u003edest_trash);\n-\tdest-\u003eidle_start = istart;\n+\tlist_splice(dest_trash, \u0026ipvs-\u003edest_trash);\n \tspin_unlock_bh(\u0026ipvs-\u003edest_trash_lock);\n }\n \n+/ Put destination back in trash /\n+static void ip_vs_trash_put_back(struct netns_ipvs ipvs,\n+\t\t\t\t struct ip_vs_dest dest)\n+{\n+\tLIST_HEAD(dest_trash);\n+\n+\tip_vs_trash_add_dest(ipvs, dest, dest-\u003eidle_start, \u0026dest_trash);\n+\tip_vs_trash_put_dests(ipvs, \u0026dest_trash, false);\n+}\n+\n+/ Put destinations in trash and save the RCU state /\n+static void ip_vs_trash_save_dests(struct netns_ipvs ipvs,\n+\t\t\t\t struct list_head dest_trash, bool cleanup)\n+{\n+\tstruct ip_vs_dest dest;\n+\tunsigned long rcu_state;\n+\n+\tif (!list_empty(dest_trash)) {\n+\t\t/* Remember when dests were removed and added to dest_trash /\n+\t\trcu_state = get_state_synchronize_rcu();\n+\t\tlist_for_each_entry(dest, dest_trash, t_list)\n+\t\t\tdest-\u003ercu_state = rcu_state;\n+\t\tip_vs_trash_put_dests(ipvs, dest_trash, cleanup);\n+\t}\n+}\n+\n static void ip_vs_dest_rcu_free(struct rcu_head head)\n {\n \tstruct ip_vs_dest dest;\n@@ -1369,8 +1410,16 @@ __ip_vs_update_dest(struct ip_vs_service svc, struct ip_vs_dest dest,\n \tif ((udest-\u003econn_flags \u0026 IP_VS_CONN_F_FWD_MASK) !=\n \t IP_VS_DFWD_METHOD(dest) \|\|\n \t udest-\u003etun_type != dest-\u003etun_type \|\|\n-\t udest-\u003etun_port != dest-\u003etun_port)\n+\t udest-\u003etun_port != dest-\u003etun_port) {\n+\t\tbool unlinked = dest-\u003ein_rs_table;\n+\n \t\tip_vs_rs_unhash(dest);\n+\t\tif (unlinked) {\n+\t\t\tdest-\u003ercu_state = get_state_synchronize_rcu();\n+\t\t\t/ Need grace period in this or next dest update /\n+\t\t\tdest-\u003eneed_gp = 1;\n+\t\t}\n+\t}\n \n \t/ set the tunnel info /\n \tdest-\u003etun_type = udest-\u003etun_type;\n@@ -1566,11 +1615,18 @@ ip_vs_add_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n \n \t\tret = ip_vs_start_estimator(svc-\u003eipvs, \u0026dest-\u003estats);\n \t\t/ On error put back dest into the trash /\n-\t\tif (ret \u003c 0)\n-\t\t\tip_vs_trash_put_dest(svc-\u003eipvs, dest, dest-\u003eidle_start,\n-\t\t\t\t\t false);\n-\t\telse\n+\t\tif (ret \u003c 0) {\n+\t\t\tip_vs_trash_put_back(svc-\u003eipvs, dest);\n+\t\t} else {\n+\t\t\t/ Readers may still follow the n_list/d_list of the\n+\t\t\t * unlinked dest, wait before linking it again.\n+\t\t\t /\n+\t\t\tcond_synchronize_rcu(dest-\u003ercu_state);\n+\t\t\t/ need_gp matters only on dest edit, reinit it /\n+\t\t\tdest-\u003eneed_gp = 0;\n+\n \t\t\t__ip_vs_update_dest(svc, dest, udest, 1);\n+\t\t}\n \t} else {\n \t\t/\n \t\t * Allocate and initialize the dest structure\n@@ -1634,7 +1690,7 @@ ip_vs_edit_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n \tDelete a destination (must be already unlinked from the service)\n /\n static void __ip_vs_del_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest,\n-\t\t\t bool cleanup)\n+\t\t\t struct list_head dest_trash, bool cleanup)\n {\n \tip_vs_stop_estimator(ipvs, \u0026dest-\u003estats);\n \n@@ -1643,7 +1699,7 @@ static void __ip_vs_del_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest,\n \t /\n \tip_vs_rs_unhash(dest);\n \n-\tip_vs_trash_put_dest(ipvs, dest, 0, cleanup);\n+\tip_vs_trash_add_dest(ipvs, dest, 0, dest_trash);\n \n \t/* Queue up delayed work to expire all no destination connections.\n \t * No-op when CONFIG_SYSCTL is disabled.\n@@ -1693,6 +1749,7 @@ ip_vs_del_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n {\n \tstruct ip_vs_dest dest;\n \t__be16 dport = udest-\u003eport;\n+\tLIST_HEAD(dest_trash);\n \n \t/ We use function that requires RCU lock /\n \trcu_read_lock();\n@@ -1712,7 +1769,9 @@ ip_vs_del_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n \t/\n \t \tDelete the destination\n \t /\n-\t__ip_vs_del_dest(svc-\u003eipvs, dest, false);\n+\t__ip_vs_del_dest(svc-\u003eipvs, dest, \u0026dest_trash, false);\n+\n+\tip_vs_trash_save_dests(svc-\u003eipvs, \u0026dest_trash, false);\n \n \treturn 0;\n }\n@@ -2057,7 +2116,8 @@ ip_vs_edit_service(struct ip_vs_service svc, struct ip_vs_service_user_kern u)\n \t- The service must be unlinked, unlocked and not referenced!\n \t- We are called under _bh lock\n /\n-static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup)\n+static void __ip_vs_del_service(struct ip_vs_service svc,\n+\t\t\t\tstruct list_head dest_trash, bool cleanup)\n {\n \tstruct ip_vs_dest dest, nxt;\n \tstruct ip_vs_scheduler old_sched;\n@@ -2091,7 +2151,7 @@ static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup)\n \t /\n \tlist_for_each_entry_safe(dest, nxt, \u0026svc-\u003edestinations, n_list) {\n \t\t__ip_vs_unlink_dest(svc, dest, 0);\n-\t\t__ip_vs_del_dest(svc-\u003eipvs, dest, cleanup);\n+\t\t__ip_vs_del_dest(svc-\u003eipvs, dest, dest_trash, cleanup);\n \t}\n \n \t/\n@@ -2114,7 +2174,8 @@ static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup)\n /\n * Unlink a service from list and try to delete it if its refcnt reached 0\n /\n-static void ip_vs_unlink_service(struct ip_vs_service svc, bool cleanup)\n+static void ip_vs_unlink_service(struct ip_vs_service svc,\n+\t\t\t\t struct list_head dest_trash, bool cleanup)\n {\n \tip_vs_unregister_conntrack(svc);\n \t/* Hold svc to avoid double release from dest_trash /\n@@ -2124,7 +2185,7 @@ static void ip_vs_unlink_service(struct ip_vs_service svc, bool cleanup)\n \t /\n \tip_vs_svc_unhash(svc);\n \n-\t__ip_vs_del_service(svc, cleanup);\n+\t__ip_vs_del_service(svc, dest_trash, cleanup);\n }\n \n /\n@@ -2134,12 +2195,14 @@ static int ip_vs_del_service(struct ip_vs_service svc)\n {\n \tstruct netns_ipvs ipvs;\n \tstruct ip_vs_rht t, p;\n+\tLIST_HEAD(dest_trash);\n \tint ns;\n \n \tif (svc == NULL)\n \t\treturn -EEXIST;\n \tipvs = svc-\u003eipvs;\n-\tip_vs_unlink_service(svc, false);\n+\tip_vs_unlink_service(svc, \u0026dest_trash, false);\n+\tip_vs_trash_save_dests(ipvs, \u0026dest_trash, false);\n \n \t/* Drop the table if no more services /\n \tns = ip_vs_get_num_services(ipvs);\n@@ -2190,6 +2253,7 @@ static int ip_vs_flush(struct netns_ipvs ipvs, bool cleanup)\n \tstruct hlist_bl_node ne;\n \tstruct hlist_bl_node e;\n \tstruct ip_vs_rht t, p;\n+\tLIST_HEAD(dest_trash);\n \n \t/* Stop the resizer and drop the tables /\n \tif (!test_and_set_bit(IP_VS_WORK_SVC_NORESIZE, \u0026ipvs-\u003ework_flags))\n@@ -2199,8 +2263,9 @@ static int ip_vs_flush(struct netns_ipvs ipvs, bool cleanup)\n \tif (ip_vs_get_num_services(ipvs)) {\n \t\tip_vs_rht_walk_buckets(ipvs-\u003esvc_table, head) {\n \t\t\thlist_bl_for_each_entry_safe(svc, e, ne, head, s_list)\n-\t\t\t\tip_vs_unlink_service(svc, cleanup);\n+\t\t\t\tip_vs_unlink_service(svc, \u0026dest_trash, cleanup);\n \t\t}\n+\t\tip_vs_trash_save_dests(ipvs, \u0026dest_trash, cleanup);\n \t}\n \n \t/* Unregister the hash table and release it after RCU grace period /\ndiff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c\nindex fb8af6b15a3999..83d1443ebe01e5 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c\n@@ -30,6 +30,7 @@ sctp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb,\n \t\t\tsch = skb_header_pointer(skb, iph-\u003elen + sizeof(_sctph),\n \t\t\t\t\t\t sizeof(_schunkh), \u0026_schunkh);\n \t\t\tif (sch) {\n+\t\t\t\t/ Accept packet without scheduling? /\n \t\t\t\tif (sch-\u003etype == SCTP_CID_ABORT \|\|\n \t\t\t\t !(sysctl_sloppy_sctp(ipvs) \|\|\n \t\t\t\t sch-\u003etype == SCTP_CID_INIT))\n@@ -47,6 +48,10 @@ sctp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb,\n \t\treturn 0;\n \t}\n \n+\t/ Do not create connection for port 0, skip the packet /\n+\tif (!ports[0] \|\| !ports[1])\n+\t\treturn 1;\n+\n \tif (likely(!ip_vs_iph_inverse(iph)))\n \t\tsvc = ip_vs_service_find(ipvs, af, skb-\u003emark, iph-\u003eprotocol,\n \t\t\t\t\t \u0026iph-\u003edaddr, ports[1]);\ndiff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c\nindex fec0e8b47b7165..2e55b62445c60c 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c\n@@ -48,6 +48,7 @@ tcp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb,\n \tif (likely(!ip_vs_iph_icmp(iph))) {\n \t\tth = skb_header_pointer(skb, iph-\u003elen, sizeof(_tcph), \u0026_tcph);\n \t\tif (th) {\n+\t\t\t/ Accept packet without scheduling? /\n \t\t\tif (th-\u003erst \|\| !(sysctl_sloppy_tcp(ipvs) \|\| th-\u003esyn))\n \t\t\t\treturn 1;\n \t\t\tports = \u0026th-\u003esource;\n@@ -62,6 +63,10 @@ tcp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb,\n \t\treturn 0;\n \t}\n \n+\t/ Do not create connection for port 0, skip the packet /\n+\tif (!ports[0] \|\| !ports[1])\n+\t\treturn 1;\n+\n \t/ No !th-\u003eack check to allow scheduling on SYN+ACK for Active FTP /\n \n \tif (likely(!ip_vs_iph_inverse(iph)))\ndiff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c\nindex f32785682402dd..92c0b76c1a021a 100644\n--- a/net/netfilter/ipvs/ip_vs_proto_udp.c\n+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c\n@@ -52,6 +52,10 @@ udp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb,\n \t\treturn 0;\n \t}\n \n+\t/ Do not create connection for port 0, skip the packet /\n+\tif (!ports[0] \|\| !ports[1])\n+\t\treturn 1;\n+\n \tif (likely(!ip_vs_iph_inverse(iph)))\n \t\tsvc = ip_vs_service_find(ipvs, af, skb-\u003emark, iph-\u003eprotocol,\n \t\t\t\t\t \u0026iph-\u003edaddr, ports[1]);\ndiff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c\nindex 06242c86e1dc83..e9e796bda57715 100644\n--- a/net/netfilter/nf_conntrack_expect.c\n+++ b/net/netfilter/nf_conntrack_expect.c\n@@ -299,13 +299,22 @@ void nf_ct_unexpect_related(struct nf_conntrack_expect exp)\n }\n EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);\n \n-/* We don't increase the master conntrack refcount for non-fulfilled\n- * conntracks. During the conntrack destruction, the expectations are\n- * always killed before the conntrack itself /\n+/\n+ nf_ct_expect_alloc - allocate a new conntrack expectation\n+ * @me: The conntrack to be used as master.\n+ \n+ The master conntrack refcount is not incremented; expectations\n+ * are always killed before the master conntrack is destroyed.\n+ \n+ Returns a new expectation on success or NULL on failure.\n+ /\n struct nf_conntrack_expect nf_ct_expect_alloc(struct nf_conn me)\n {\n \tstruct nf_conntrack_expect new;\n \n+\tif (!nf_ct_master_acceptable(me))\n+\t\treturn NULL;\n+\n \tnew = kmem_cache_zalloc(nf_ct_expect_cachep, GFP_ATOMIC);\n \tif (!new)\n \t\treturn NULL;\ndiff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c\nindex 1f8d94a0524032..30428d520e432b 100644\n--- a/net/netfilter/nf_conntrack_netlink.c\n+++ b/net/netfilter/nf_conntrack_netlink.c\n@@ -2231,6 +2231,26 @@ ctnetlink_change_conntrack(struct nf_conn ct,\n \treturn 0;\n }\n \n+static struct nf_conn \n+ctnetlink_find_get_master(struct net net, const struct nf_conntrack_zone zone,\n+\t\t\t const struct nf_conntrack_tuple tuple)\n+{\n+\tstruct nf_conntrack_tuple_hash master_h;\n+\tstruct nf_conn master_ct;\n+\n+\tmaster_h = nf_conntrack_find_get(net, zone, tuple);\n+\tif (!master_h)\n+\t\treturn ERR_PTR(-ENOENT);\n+\n+\tmaster_ct = nf_ct_tuplehash_to_ctrack(master_h);\n+\tif (!nf_ct_master_acceptable(master_ct)) {\n+\t\tnf_ct_put(master_ct);\n+\t\treturn ERR_PTR(-EMLINK);\n+\t}\n+\n+\treturn master_ct;\n+}\n+\n static struct nf_conn \n ctnetlink_create_conntrack(struct net net,\n \t\t\t const struct nf_conntrack_zone zone,\n@@ -2356,7 +2376,6 @@ ctnetlink_create_conntrack(struct net net,\n \t/ setup master conntrack: this is a confirmed expectation /\n \tif (cda[CTA_TUPLE_MASTER]) {\n \t\tstruct nf_conntrack_tuple master;\n-\t\tstruct nf_conntrack_tuple_hash master_h;\n \t\tstruct nf_conn master_ct;\n \n \t\terr = ctnetlink_parse_tuple(cda, \u0026master, CTA_TUPLE_MASTER,\n@@ -2364,12 +2383,11 @@ ctnetlink_create_conntrack(struct net net,\n \t\tif (err \u003c 0)\n \t\t\tgoto err2;\n \n-\t\tmaster_h = nf_conntrack_find_get(net, zone, \u0026master);\n-\t\tif (master_h == NULL) {\n-\t\t\terr = -ENOENT;\n+\t\tmaster_ct = ctnetlink_find_get_master(net, zone, \u0026master);\n+\t\tif (IS_ERR(master_ct)) {\n+\t\t\terr = PTR_ERR(master_ct);\n \t\t\tgoto err2;\n \t\t}\n-\t\tmaster_ct = nf_ct_tuplehash_to_ctrack(master_h);\n \t\t__set_bit(IPS_EXPECTED_BIT, \u0026ct-\u003estatus);\n \t\tct-\u003emaster = master_ct;\n \t}\n@@ -3613,7 +3631,6 @@ ctnetlink_create_expect(struct net net,\n \t\t\tu_int8_t u3, u32 portid, int report)\n {\n \tstruct nf_conntrack_tuple tuple, mask, master_tuple;\n-\tstruct nf_conntrack_tuple_hash h = NULL;\n \tstruct nf_conntrack_expect exp;\n \tstruct nf_conn ct;\n \tint err;\n@@ -3633,10 +3650,9 @@ ctnetlink_create_expect(struct net net,\n \t\treturn err;\n \n \t/ Look for master conntrack of this expectation /\n-\th = nf_conntrack_find_get(net, zone, \u0026master_tuple);\n-\tif (!h)\n-\t\treturn -ENOENT;\n-\tct = nf_ct_tuplehash_to_ctrack(h);\n+\tct = ctnetlink_find_get_master(net, zone, \u0026master_tuple);\n+\tif (IS_ERR(ct))\n+\t\treturn PTR_ERR(ct);\n \n \trcu_read_lock();\n \texp = ctnetlink_alloc_expect(cda, ct, NULL, \u0026tuple, \u0026mask);\ndiff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c\nindex 64bc440b1181f1..b05dc8858d094d 100644\n--- a/net/netfilter/nf_conntrack_sip.c\n+++ b/net/netfilter/nf_conntrack_sip.c\n@@ -701,9 +701,9 @@ static int ct_sip_parse_transport(struct nf_conn ct, const char dptr,\n \n \tif (ct_sip_parse_param(ct, dptr, dataoff, datalen, \"transport=\",\n \t\t\t \u0026matchoff, \u0026matchlen)) {\n-\t\tif (!strncasecmp(dptr + matchoff, \"TCP\", strlen(\"TCP\")))\n+\t\tif (matchlen \u003e= 3 \u0026\u0026 !strncasecmp(dptr + matchoff, \"TCP\", 3))\n \t\t\tproto = IPPROTO_TCP;\n-\t\telse if (!strncasecmp(dptr + matchoff, \"UDP\", strlen(\"UDP\")))\n+\t\telse if (matchlen \u003e= 3 \u0026\u0026 !strncasecmp(dptr + matchoff, \"UDP\", 3))\n \t\t\tproto = IPPROTO_UDP;\n \t\telse\n \t\t\treturn 0;\ndiff --git a/net/netfilter/nf_dup_netdev.c b/net/netfilter/nf_dup_netdev.c\nindex c6bd5c29bed66d..918716629c1556 100644\n--- a/net/netfilter/nf_dup_netdev.c\n+++ b/net/netfilter/nf_dup_netdev.c\n@@ -12,6 +12,7 @@\n #include \u003cnet/netfilter/nf_tables.h\u003e\n #include \u003cnet/netfilter/nf_tables_offload.h\u003e\n #include \u003cnet/netfilter/nf_dup_netdev.h\u003e\n+#include \u003cnet/netfilter/nf_recursion.h\u003e\n \n static void nf_do_netdev_egress(struct sk_buff skb, struct net_device dev,\n \t\t\t\tenum nf_dev_hooks hook)\ndiff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c\nindex 0d72dc8ae47a13..2aa2647ed9df06 100644\n--- a/net/netfilter/nf_flow_table_core.c\n+++ b/net/netfilter/nf_flow_table_core.c\n@@ -544,6 +544,7 @@ static void nf_flow_table_extend_ct_timeout(struct nf_conn ct)\n \n \t\tswitch (l4proto) {\n \t\tcase IPPROTO_UDP:\n+\t\tcase IPPROTO_GRE:\n \t\t\tnew_timeout = NF_CT_DAY;\n \t\t\tbreak;\n \t\tcase IPPROTO_TCP:\ndiff --git a/net/netfilter/nf_nat_masquerade.c b/net/netfilter/nf_nat_masquerade.c\nindex 4de6e0a517015b..c2a85bd84af131 100644\n--- a/net/netfilter/nf_nat_masquerade.c\n+++ b/net/netfilter/nf_nat_masquerade.c\n@@ -62,8 +62,7 @@ nf_nat_masquerade_ipv4(struct sk_buff skb, unsigned int hooknum,\n \t\tnat-\u003emasq_index = out-\u003eifindex;\n \n \t/ Transfer from original range. /\n-\tmemset(\u0026newrange.min_addr, 0, sizeof(newrange.min_addr));\n-\tmemset(\u0026newrange.max_addr, 0, sizeof(newrange.max_addr));\n+\tmemset(\u0026newrange, 0, sizeof(newrange));\n \tnewrange.flags = range-\u003eflags \| NF_NAT_RANGE_MAP_IPS;\n \tnewrange.min_addr.ip = newsrc;\n \tnewrange.max_addr.ip = newsrc;\n@@ -242,6 +241,7 @@ nf_nat_masquerade_ipv6(struct sk_buff skb, const struct nf_nat_range2 range,\n \tif (nat)\n \t\tnat-\u003emasq_index = out-\u003eifindex;\n \n+\tmemset(\u0026newrange, 0, sizeof(newrange));\n \tnewrange.flags\t\t= range-\u003eflags \| NF_NAT_RANGE_MAP_IPS;\n \tnewrange.min_addr.in6\t= src;\n \tnewrange.max_addr.in6\t= src;\ndiff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c\nindex 166d05e994ac6c..bd603e3a99a59d 100644\n--- a/net/netfilter/nf_queue.c\n+++ b/net/netfilter/nf_queue.c\n@@ -219,6 +219,7 @@ static int __nf_queue(struct sk_buff skb, const struct nf_hook_state state,\n \tentry = (struct nf_queue_entry) {\n \t\t.skb\t= skb,\n \t\t.skb_dev = skb-\u003edev,\n+\t\t.in_nf_duplicate = current-\u003ein_nf_duplicate,\n \t\t.state\t= state,\n \t\t.hook_index = index,\n \t\t.size\t= sizeof(entry) + route_key_size,\ndiff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c\nindex 59ac623e6805f1..8b94b5e7dbdbd0 100644\n--- a/net/netfilter/nf_tables_api.c\n+++ b/net/netfilter/nf_tables_api.c\n@@ -760,16 +760,6 @@ static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule)\n \tif (trans == NULL)\n \t\treturn -ENOMEM;\n \n-\tif (ctx-\u003echain-\u003eflags \u0026 NFT_CHAIN_HW_OFFLOAD) {\n-\t\tflow = nft_flow_rule_create(ctx-\u003enet, rule);\n-\t\tif (IS_ERR(flow)) {\n-\t\t\tnft_trans_destroy(trans);\n-\t\t\treturn PTR_ERR(flow);\n-\t\t}\n-\n-\t\tnft_trans_flow_rule(trans) = flow;\n-\t}\n-\n \terr = nf_tables_delrule_deactivate(ctx, rule);\n \tif (err \u003c 0) {\n \t\tnft_trans_destroy(trans);\n@@ -777,6 +767,14 @@ static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule)\n \t}\n \tnft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);\n \n+\tif (ctx-\u003echain-\u003eflags \u0026 NFT_CHAIN_HW_OFFLOAD) {\n+\t\tflow = nft_flow_rule_create(ctx-\u003enet, rule);\n+\t\tif (IS_ERR(flow))\n+\t\t\treturn PTR_ERR(flow);\n+\n+\t\tnft_trans_flow_rule(trans) = flow;\n+\t}\n+\n \treturn 0;\n }\n \n@@ -4570,8 +4568,7 @@ static int nf_tables_newrule(struct sk_buff skb, const struct nfnl_info info,\n err_destroy_flow_rule:\n \tnft_use_dec_restore(\u0026chain-\u003euse);\n err_destroy_flow:\n-\tif (flow)\n-\t\tnft_flow_rule_destroy(flow);\n+\tnft_flow_rule_destroy(flow);\n err_release_rule:\n \tnft_rule_expr_deactivate(\u0026ctx, rule, NFT_TRANS_PREPARE_ERROR);\n \tnf_tables_rule_destroy(\u0026ctx, rule);\ndiff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c\nindex 0ac3c26dfb3d16..48b9e58e0c44f1 100644\n--- a/net/netfilter/nf_tables_offload.c\n+++ b/net/netfilter/nf_tables_offload.c\n@@ -148,6 +148,9 @@ void nft_flow_rule_destroy(struct nft_flow_rule flow)\n \tstruct flow_action_entry entry;\n \tint i;\n \n+\tif (!flow)\n+\t\treturn;\n+\n \tflow_action_for_each(i, entry, \u0026flow-\u003erule-\u003eaction) {\n \t\tswitch (entry-\u003eid) {\n \t\tcase FLOW_ACTION_REDIRECT:\ndiff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c\nindex 90d887546f7db1..a8aa7ad832c3f3 100644\n--- a/net/netfilter/nfnetlink_queue.c\n+++ b/net/netfilter/nfnetlink_queue.c\n@@ -44,6 +44,7 @@\n #include \u003cnet/sock.h\u003e\n #include \u003cnet/tcp_states.h\u003e\n #include \u003cnet/netfilter/nf_queue.h\u003e\n+#include \u003cnet/net_debug.h\u003e\n #include \u003cnet/netns/generic.h\u003e\n \n #include \u003clinux/atomic.h\u003e\n@@ -365,21 +366,30 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict)\n \tconst struct nf_hook_entry hook_entry;\n \tconst struct nf_hook_entries hooks;\n \tstruct sk_buff skb = entry-\u003eskb;\n+\tbool old_in_nf_duplicate;\n \tconst struct net net;\n \tunsigned int i;\n \tint err;\n \tu8 pf;\n \n+\tDEBUG_NET_WARN_ONCE(current-\u003ein_nf_duplicate \u0026\u0026\n+\t\t\t !entry-\u003ein_nf_duplicate,\n+\t\t\t \"%s called with unexpected duplication guard\",\n+\t\t\t __func__);\n+\tlocal_bh_disable();\n+\told_in_nf_duplicate = current-\u003ein_nf_duplicate;\n+\n \tnet = entry-\u003estate.net;\n \tpf = entry-\u003estate.pf;\n \n+\tcurrent-\u003ein_nf_duplicate = entry-\u003ein_nf_duplicate;\n \thooks = nf_hook_entries_head(net, pf, entry-\u003estate.hook);\n \n \ti = entry-\u003ehook_index;\n \tif (!hooks \|\| i \u003e= hooks-\u003enum_hook_entries) {\n \t\tkfree_skb_reason(skb, SKB_DROP_REASON_NETFILTER_DROP);\n \t\tnf_queue_entry_free(entry);\n-\t\treturn;\n+\t\tgoto out;\n \t}\n \n \thook_entry = \u0026hooks-\u003ehooks[i];\n@@ -402,9 +412,7 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict)\n \tswitch (verdict \u0026 NF_VERDICT_MASK) {\n \tcase NF_ACCEPT:\n \tcase NF_STOP:\n-\t\tlocal_bh_disable();\n \t\tentry-\u003estate.okfn(entry-\u003estate.net, entry-\u003estate.sk, skb);\n-\t\tlocal_bh_enable();\n \t\tbreak;\n \tcase NF_QUEUE:\n \t\terr = nf_queue(skb, \u0026entry-\u003estate, i, verdict);\n@@ -418,6 +426,9 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict)\n \t}\n \n \tnf_queue_entry_free(entry);\n+out:\n+\tcurrent-\u003ein_nf_duplicate = old_in_nf_duplicate;\n+\tlocal_bh_enable();\n }\n \n / return true if the entry has an unconfirmed conntrack attached that isn't owned by us\ndiff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c\nindex a48c2f765bbaad..7447da931a9576 100644\n--- a/net/netfilter/nft_fwd_netdev.c\n+++ b/net/netfilter/nft_fwd_netdev.c\n@@ -14,6 +14,7 @@\n #include \u003cnet/netfilter/nf_tables.h\u003e\n #include \u003cnet/netfilter/nf_tables_offload.h\u003e\n #include \u003cnet/netfilter/nf_dup_netdev.h\u003e\n+#include \u003cnet/netfilter/nf_recursion.h\u003e\n #include \u003cnet/neighbour.h\u003e\n #include \u003cnet/ip.h\u003e\n \ndiff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c\nindex fbe1750f1ca232..9d685899da7018 100644\n--- a/net/netfilter/nft_set_rbtree.c\n+++ b/net/netfilter/nft_set_rbtree.c\n@@ -953,7 +953,8 @@ static void nft_rbtree_gc_queue(struct nft_set set)\n \t}\n \n \tgc = nft_trans_gc_catchall_sync(gc);\n-\tnft_trans_gc_queue_sync_done(gc);\n+\tif (gc)\n+\t\tnft_trans_gc_queue_sync_done(gc);\n }\n \n static u64 nft_rbtree_privsize(const struct nlattr const nla[],\ndiff --git a/net/netfilter/xt_NETMAP.c b/net/netfilter/xt_NETMAP.c\nindex 7da065a472e0ec..8bcb3f716d68aa 100644\n--- a/net/netfilter/xt_NETMAP.c\n+++ b/net/netfilter/xt_NETMAP.c\n@@ -44,6 +44,7 @@ netmap_tg6(struct sk_buff skb, const struct xt_action_param par)\n \t\t\t\t netmask.ip6[i];\n \t}\n \n+\tmemset(\u0026newrange, 0, sizeof(newrange));\n \tnewrange.flags\t= range-\u003eflags \| NF_NAT_RANGE_MAP_IPS;\n \tnewrange.min_addr\t= new_addr;\n \tnewrange.max_addr\t= new_addr;\n@@ -91,8 +92,7 @@ netmap_tg4(struct sk_buff skb, const struct xt_action_param par)\n \t\tnew_ip = ip_hdr(skb)-\u003esaddr \u0026 ~netmask;\n \tnew_ip \|= mr-\u003erange[0].min_ip \u0026 netmask;\n \n-\tmemset(\u0026newrange.min_addr, 0, sizeof(newrange.min_addr));\n-\tmemset(\u0026newrange.max_addr, 0, sizeof(newrange.max_addr));\n+\tmemset(\u0026newrange, 0, sizeof(newrange));\n \tnewrange.flags\t = mr-\u003erange[0].flags \| NF_NAT_RANGE_MAP_IPS;\n \tnewrange.min_addr.ip = new_ip;\n \tnewrange.max_addr.ip = new_ip;\ndiff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c\nindex 55f1f2d89952d0..00cccf003cff5e 100644\n--- a/net/netfilter/xt_recent.c\n+++ b/net/netfilter/xt_recent.c\n@@ -650,14 +650,15 @@ static void __net_exit recent_proc_net_exit(struct net net)\n \n \t/ recent_net_exit() is called before recent_mt_destroy(). Make sure\n \t * that the parent xt_recent proc entry is empty before trying to\n-\t * remove it.\n+\t * remove it. Use recent_mutex instead of recent_lock since\n+\t * remove_proc_entry() may sleep.\n \t */\n-\tspin_lock_bh(\u0026recent_lock);\n+\tmutex_lock(\u0026recent_mutex);\n \tlist_for_each_entry(t, \u0026recent_net-\u003etables, list)\n \t remove_proc_entry(t-\u003ename, recent_net-\u003ext_recent);\n \n \trecent_net-\u003ext_recent = NULL;\n-\tspin_unlock_bh(\u0026recent_lock);\n+\tmutex_unlock(\u0026recent_mutex);\n \n \tremove_proc_entry(\"xt_recent\", net-\u003eproc_net);\n }\n" }
2/1	2026/11/02 05:55	agent	patch-evaluator	7m Model: core Args: null Results: { "EnableConfigs": [ "NETFILTER", "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_CONNTRACK", "NF_CT_NETLINK", "NF_CONNTRACK_SIP", "NF_TABLES", "NETFILTER_NETLINK_QUEUE", "NF_REJECT_IPV4", "NF_REJECT_IPV6", "NF_FLOW_TABLE", "NF_CONNTRACK_BRIDGE", "NETFILTER_XT_MATCH_RECENT", "NETFILTER_XT_TARGET_NETMAP", "DEBUG_NET" ], "FocusSymbols": [ "nf_send_reset", "nf_send_reset6", "nf_ct_expect_alloc", "ctnetlink_find_get_master", "ctnetlink_create_conntrack", "ctnetlink_create_expect", "nf_reinject", "__nf_queue", "ip_vs_add_dest", "ip_vs_del_dest", "ip_vs_del_service", "ip_vs_flush", "ip_vs_new_conn_out", "tcp_conn_schedule", "udp_conn_schedule", "sctp_conn_schedule", "nft_delrule", "nft_flow_rule_destroy", "nft_rbtree_gc_queue", "ct_sip_parse_transport", "recent_proc_net_exit" ], "Reasoning": "The patch series touches several core Netfilter and IPVS subsystems. It introduces recursion tracking into IPv4 and IPv6 reset packet generation, bounds conntrack expectation chains, adds RCU grace period synchronization and lockdep assertions when rehashing and trashing IPVS destinations, saves and validates packet duplication flags across nfqueue reinjection with DEBUG_NET_WARN_ONCE, fixes locking in xt_recent netns teardown, and handles port 0 validation in IPVS protocol schedulers. All modified paths are reachable via standard networking syscalls, netlink, and network namespaces. Fuzzing is warranted to test new invariants, assertions, and concurrency semantics.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit d8d758cd343442f0e384a65ddedcc65a14ae3601 Author: syz-cluster <triage@syzkaller.com> Date: Mon Nov 2 05:55:08 2026 +0000 syz-cluster: applied patch under review diff --git a/include/linux/netdevice_xmit.h b/include/linux/netdevice_xmit.h index cc232508e695ee..286ae5a6101e8c 100644 --- a/include/linux/netdevice_xmit.h +++ b/include/linux/netdevice_xmit.h @@ -18,8 +18,8 @@ struct netdev_xmit { u8 sched_mirred_nest; struct net_device sched_mirred_dev[MIRRED_NEST_LIMIT]; #endif -#if IS_ENABLED(CONFIG_NF_DUP_NETDEV) - u8 nf_dup_skb_recursion; +#if IS_ENABLED(CONFIG_NETFILTER) + u8 nf_xmit_skb_recursion; #endif }; diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h index 9a83bff32569da..50a2999beb01fe 100644 --- a/include/net/ip_vs.h +++ b/include/net/ip_vs.h @@ -1021,7 +1021,9 @@ struct ip_vs_dest { struct rcu_head rcu_head; struct list_head t_list; / in dest_trash / - unsigned int in_rs_table:1; / we are in rs_table / + unsigned long rcu_state; / GP cookie when trashed / + unsigned int in_rs_table:1, / we are in rs_table / + need_gp:1; / Need GP on rehash / }; / The scheduler object / diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h index 335b8c43694f8e..617178fd4d8bc3 100644 --- a/include/net/netfilter/nf_conntrack_helper.h +++ b/include/net/netfilter/nf_conntrack_helper.h @@ -29,6 +29,8 @@ enum nf_ct_helper_flags { #define NF_CT_HELPER_NAME_LEN 16 +#define NF_CT_MAX_EXPECT_CHAIN_LEN 2 + / Must be kept in sync with the classes defined by helpers / #define NF_CT_MAX_EXPECT_CLASSES 4 @@ -159,6 +161,19 @@ static inline void nf_ct_help_put(const struct nf_conn ct) kfree_rcu(helper, rcu); } +static inline bool nf_ct_master_acceptable(const struct nf_conn m) +{ + unsigned int depth = 0; + + while (m->master) { + if (++depth >= NF_CT_MAX_EXPECT_CHAIN_LEN) + return false; + m = m->master; + } + + return true; +} + int nf_conntrack_helper_init(void); void nf_conntrack_helper_fini(void); diff --git a/include/net/netfilter/nf_dup_netdev.h b/include/net/netfilter/nf_dup_netdev.h index f6b05bd80c3fe3..a394112646144e 100644 --- a/include/net/netfilter/nf_dup_netdev.h +++ b/include/net/netfilter/nf_dup_netdev.h @@ -9,41 +9,6 @@ void nf_dup_netdev_egress(const struct nft_pktinfo pkt, int oif); void nf_fwd_netdev_egress(const struct nft_pktinfo pkt, int oif); -#define NF_RECURSION_LIMIT 2 - -#ifndef CONFIG_PREEMPT_RT -static inline bool nf_dev_xmit_recursion(void) -{ - return unlikely(__this_cpu_read(softnet_data.xmit.nf_dup_skb_recursion) > - NF_RECURSION_LIMIT); -} - -static inline void nf_dev_xmit_recursion_inc(void) -{ - __this_cpu_inc(softnet_data.xmit.nf_dup_skb_recursion); -} - -static inline void nf_dev_xmit_recursion_dec(void) -{ - __this_cpu_dec(softnet_data.xmit.nf_dup_skb_recursion); -} -#else -static inline bool nf_dev_xmit_recursion(void) -{ - return unlikely(current->net_xmit.nf_dup_skb_recursion > NF_RECURSION_LIMIT); -} - -static inline void nf_dev_xmit_recursion_inc(void) -{ - current->net_xmit.nf_dup_skb_recursion++; -} - -static inline void nf_dev_xmit_recursion_dec(void) -{ - current->net_xmit.nf_dup_skb_recursion--; -} -#endif - struct nft_offload_ctx; struct nft_flow_rule; diff --git a/include/net/netfilter/nf_queue.h b/include/net/netfilter/nf_queue.h index 86021c55ba3ce9..4a8cefd8398d79 100644 --- a/include/net/netfilter/nf_queue.h +++ b/include/net/netfilter/nf_queue.h @@ -23,6 +23,7 @@ struct nf_queue_entry { struct net_device physout; #endif struct nf_hook_state state; + bool in_nf_duplicate; bool nf_ct_is_unconfirmed; u16 size; /* sizeof(entry) + saved route keys / diff --git a/include/net/netfilter/nf_recursion.h b/include/net/netfilter/nf_recursion.h new file mode 100644 index 00000000000000..1ac65f7793f197 --- /dev/null +++ b/include/net/netfilter/nf_recursion.h @@ -0,0 +1,42 @@ +/ SPDX-License-Identifier: GPL-2.0 / +#ifndef _NF_RECURSION_H_ +#define _NF_RECURSION_H_ + +#include <linux/netdevice.h> + +#define NF_RECURSION_LIMIT 2 + +#ifndef CONFIG_PREEMPT_RT +static inline bool nf_dev_xmit_recursion(void) +{ + return unlikely(__this_cpu_read(softnet_data.xmit.nf_xmit_skb_recursion) > + NF_RECURSION_LIMIT); +} + +static inline void nf_dev_xmit_recursion_inc(void) +{ + __this_cpu_inc(softnet_data.xmit.nf_xmit_skb_recursion); +} + +static inline void nf_dev_xmit_recursion_dec(void) +{ + __this_cpu_dec(softnet_data.xmit.nf_xmit_skb_recursion); +} +#else +static inline bool nf_dev_xmit_recursion(void) +{ + return unlikely(current->net_xmit.nf_xmit_skb_recursion > NF_RECURSION_LIMIT); +} + +static inline void nf_dev_xmit_recursion_inc(void) +{ + current->net_xmit.nf_xmit_skb_recursion++; +} + +static inline void nf_dev_xmit_recursion_dec(void) +{ + current->net_xmit.nf_xmit_skb_recursion--; +} +#endif + +#endif / _NF_RECURSION_H_ / diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c index b5444335b86f2b..8c83dc05114ba7 100644 --- a/net/bridge/netfilter/nf_conntrack_bridge.c +++ b/net/bridge/netfilter/nf_conntrack_bridge.c @@ -358,7 +358,7 @@ nf_ct_bridge_refrag(struct sk_buff skb, const struct nf_hook_state state, nf_br_ip6_fragment(state->net, state->sk, skb, &data, output); break; default: - WARN_ON_ONCE(1); + DEBUG_NET_WARN_ON_ONCE(1); return NF_DROP; } diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c index cf747e1e17a363..7ff3d1f0ffd411 100644 --- a/net/ipv4/netfilter/arp_tables.c +++ b/net/ipv4/netfilter/arp_tables.c @@ -371,11 +371,12 @@ static int mark_source_chains(const struct xt_table_info newinfo, e->counters.pcnt = pos; pos += size; } else { - int newpos = t->verdict; + int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && - newpos >= 0) { + t->verdict >= 0) { + newpos = t->verdict; /* This a jump; chase it. / if (!xt_find_jump_offset(offsets, newpos, newinfo->number)) diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index 809441cedcedc7..b302bd77180a75 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -422,11 +422,12 @@ mark_source_chains(const struct xt_table_info newinfo, e->counters.pcnt = pos; pos += size; } else { - int newpos = t->verdict; + int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && - newpos >= 0) { + t->verdict >= 0) { + newpos = t->verdict; /* This a jump; chase it. / if (!xt_find_jump_offset(offsets, newpos, newinfo->number)) diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c index 7cb33af671e260..4082fa184af8ba 100644 --- a/net/ipv4/netfilter/nf_reject_ipv4.c +++ b/net/ipv4/netfilter/nf_reject_ipv4.c @@ -10,6 +10,7 @@ #include <net/dst.h> #include <net/dst_metadata.h> #include <net/netfilter/ipv4/nf_reject.h> +#include <net/netfilter/nf_recursion.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter_bridge.h> @@ -336,7 +337,18 @@ void nf_send_reset(struct net net, struct sock sk, struct sk_buff oldskb, dev_queue_xmit(nskb); } else #endif + { + local_bh_disable(); + if (nf_dev_xmit_recursion()) { + local_bh_enable(); + goto free_nskb; + } + + nf_dev_xmit_recursion_inc(); ip_local_out(net, nskb->sk, nskb); + nf_dev_xmit_recursion_dec(); + local_bh_enable(); + } return; diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index 313c4aac377aa2..010baaa6066573 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -440,11 +440,12 @@ mark_source_chains(const struct xt_table_info newinfo, e->counters.pcnt = pos; pos += size; } else { - int newpos = t->verdict; + int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && - newpos >= 0) { + t->verdict >= 0) { + newpos = t->verdict; / This a jump; chase it. / if (!xt_find_jump_offset(offsets, newpos, newinfo->number)) diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c index 5e08d8529cc889..7c94641845175c 100644 --- a/net/ipv6/netfilter/nf_reject_ipv6.c +++ b/net/ipv6/netfilter/nf_reject_ipv6.c @@ -10,6 +10,7 @@ #include <net/ip6_checksum.h> #include <net/dst_metadata.h> #include <net/netfilter/ipv6/nf_reject.h> +#include <net/netfilter/nf_recursion.h> #include <linux/netfilter_ipv6.h> #include <linux/netfilter_bridge.h> @@ -409,7 +410,19 @@ void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb, dev_queue_xmit(nskb); } else #endif + { + local_bh_disable(); + if (nf_dev_xmit_recursion()) { + local_bh_enable(); + kfree_skb(nskb); + return; + } + + nf_dev_xmit_recursion_inc(); ip6_local_out(net, sk, nskb); + nf_dev_xmit_recursion_dec(); + local_bh_enable(); + } } EXPORT_SYMBOL_GPL(nf_send_reset6); diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c index 11cbdbaf561daf..2c1b47702da213 100644 --- a/net/netfilter/ipvs/ip_vs_app.c +++ b/net/netfilter/ipvs/ip_vs_app.c @@ -242,7 +242,7 @@ void unregister_ip_vs_app(struct netns_ipvs ipvs, struct ip_vs_app app) } list_del(&a->a_list); - kfree(a); + kfree_rcu(a, rcu_head); /* decrease the module use count / ip_vs_use_count_dec(); diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c index fd503f0efb5783..f3eb72e95024dd 100644 --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -1305,6 +1305,7 @@ static inline bool is_new_conn_expected(const struct ip_vs_conn cp, * In fwmark-VS actual vaddr and vport are unknown to IPVS * 2) Real Server and Virtual Service were NOT configured without port: * This is to allow match of different VS to the same RS ip-addr + * 3) Client port is not 0 / struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc, struct ip_vs_dest dest, @@ -1328,7 +1329,7 @@ struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc, /* check pre-requisites are satisfied / if (svc->fwmark) return NULL; - if (!vport \|\| !dport) + if (!vport \|\| !dport \|\| !cport) return NULL; / for persistent service first create connection template / @@ -2502,12 +2503,12 @@ static int __net_init __ip_vs_init(struct net net) if (ip_vs_estimator_net_init(ipvs) < 0) goto estimator_fail; - if (ip_vs_control_net_init(ipvs) < 0) - goto control_fail; - if (ip_vs_protocol_net_init(ipvs) < 0) goto protocol_fail; + if (ip_vs_control_net_init(ipvs) < 0) + goto control_fail; + if (ip_vs_app_net_init(ipvs) < 0) goto app_fail; @@ -2527,10 +2528,10 @@ static int __net_init __ip_vs_init(struct net net) conn_fail: ip_vs_app_net_cleanup(ipvs); app_fail: - ip_vs_protocol_net_cleanup(ipvs); -protocol_fail: ip_vs_control_net_cleanup(ipvs); control_fail: + ip_vs_protocol_net_cleanup(ipvs); +protocol_fail: ip_vs_estimator_net_cleanup(ipvs); estimator_fail: net->ipvs = NULL; @@ -2547,8 +2548,8 @@ static void __net_exit __ip_vs_cleanup_batch(struct list_head net_list) ipvs = net_ipvs(net); ip_vs_conn_net_cleanup(ipvs); ip_vs_app_net_cleanup(ipvs); - ip_vs_protocol_net_cleanup(ipvs); ip_vs_control_net_cleanup(ipvs); + ip_vs_protocol_net_cleanup(ipvs); ip_vs_estimator_net_cleanup(ipvs); IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen); net->ipvs = NULL; diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index ce9fe20d6106a8..7f10cf5b48c7f3 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -64,7 +64,8 @@ int ip_vs_get_debug_level(void) /* Protos / -static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup); +static void __ip_vs_del_service(struct ip_vs_service svc, + struct list_head dest_trash, bool cleanup); #ifdef CONFIG_IP_VS_IPV6 @@ -918,6 +919,11 @@ static void ip_vs_rs_hash(struct netns_ipvs ipvs, struct ip_vs_dest dest) / hash = ip_vs_rs_hashkey(dest->af, &dest->addr, port); + / Need RCU grace period when rehashing / + if (dest->need_gp) { + cond_synchronize_rcu(dest->rcu_state); + dest->need_gp = 0; + } hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]); dest->in_rs_table = 1; } @@ -1111,6 +1117,8 @@ ip_vs_trash_get_dest(struct ip_vs_service svc, int dest_af, struct ip_vs_dest dest; struct netns_ipvs ipvs = svc->ipvs; + lockdep_assert_held(&ipvs->service_mutex); + /* * Find the destination in trash / @@ -1144,24 +1152,57 @@ ip_vs_trash_get_dest(struct ip_vs_service svc, int dest_af, return dest; } -/* Put destination in trash / -static void ip_vs_trash_put_dest(struct netns_ipvs ipvs, +/* Add destination in temp list for trash / +static void ip_vs_trash_add_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest, unsigned long istart, - bool cleanup) + struct list_head dest_trash) { - spin_lock_bh(&ipvs->dest_trash_lock); IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n", IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port), refcount_read(&dest->refcnt)); + /* dest lives in trash with reference / + list_add(&dest->t_list, dest_trash); + dest->idle_start = istart; +} + +/ Put destinations in trash / +static void ip_vs_trash_put_dests(struct netns_ipvs ipvs, + struct list_head dest_trash, bool cleanup) +{ + spin_lock_bh(&ipvs->dest_trash_lock); if (list_empty(&ipvs->dest_trash) && !cleanup) mod_timer(&ipvs->dest_trash_timer, jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1)); - / dest lives in trash with reference / - list_add(&dest->t_list, &ipvs->dest_trash); - dest->idle_start = istart; + list_splice(dest_trash, &ipvs->dest_trash); spin_unlock_bh(&ipvs->dest_trash_lock); } +/ Put destination back in trash / +static void ip_vs_trash_put_back(struct netns_ipvs ipvs, + struct ip_vs_dest dest) +{ + LIST_HEAD(dest_trash); + + ip_vs_trash_add_dest(ipvs, dest, dest->idle_start, &dest_trash); + ip_vs_trash_put_dests(ipvs, &dest_trash, false); +} + +/ Put destinations in trash and save the RCU state / +static void ip_vs_trash_save_dests(struct netns_ipvs ipvs, + struct list_head dest_trash, bool cleanup) +{ + struct ip_vs_dest dest; + unsigned long rcu_state; + + if (!list_empty(dest_trash)) { + /* Remember when dests were removed and added to dest_trash / + rcu_state = get_state_synchronize_rcu(); + list_for_each_entry(dest, dest_trash, t_list) + dest->rcu_state = rcu_state; + ip_vs_trash_put_dests(ipvs, dest_trash, cleanup); + } +} + static void ip_vs_dest_rcu_free(struct rcu_head head) { struct ip_vs_dest dest; @@ -1369,8 +1410,16 @@ __ip_vs_update_dest(struct ip_vs_service svc, struct ip_vs_dest dest, if ((udest->conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_DFWD_METHOD(dest) \|\| udest->tun_type != dest->tun_type \|\| - udest->tun_port != dest->tun_port) + udest->tun_port != dest->tun_port) { + bool unlinked = dest->in_rs_table; + ip_vs_rs_unhash(dest); + if (unlinked) { + dest->rcu_state = get_state_synchronize_rcu(); + / Need grace period in this or next dest update / + dest->need_gp = 1; + } + } / set the tunnel info / dest->tun_type = udest->tun_type; @@ -1566,11 +1615,18 @@ ip_vs_add_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) ret = ip_vs_start_estimator(svc->ipvs, &dest->stats); / On error put back dest into the trash / - if (ret < 0) - ip_vs_trash_put_dest(svc->ipvs, dest, dest->idle_start, - false); - else + if (ret < 0) { + ip_vs_trash_put_back(svc->ipvs, dest); + } else { + / Readers may still follow the n_list/d_list of the + * unlinked dest, wait before linking it again. + / + cond_synchronize_rcu(dest->rcu_state); + / need_gp matters only on dest edit, reinit it / + dest->need_gp = 0; + __ip_vs_update_dest(svc, dest, udest, 1); + } } else { / * Allocate and initialize the dest structure @@ -1634,7 +1690,7 @@ ip_vs_edit_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) * Delete a destination (must be already unlinked from the service) / static void __ip_vs_del_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest, - bool cleanup) + struct list_head dest_trash, bool cleanup) { ip_vs_stop_estimator(ipvs, &dest->stats); @@ -1643,7 +1699,7 @@ static void __ip_vs_del_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest, / ip_vs_rs_unhash(dest); - ip_vs_trash_put_dest(ipvs, dest, 0, cleanup); + ip_vs_trash_add_dest(ipvs, dest, 0, dest_trash); / Queue up delayed work to expire all no destination connections. * No-op when CONFIG_SYSCTL is disabled. @@ -1693,6 +1749,7 @@ ip_vs_del_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) { struct ip_vs_dest dest; __be16 dport = udest->port; + LIST_HEAD(dest_trash); / We use function that requires RCU lock / rcu_read_lock(); @@ -1712,7 +1769,9 @@ ip_vs_del_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) / * Delete the destination / - __ip_vs_del_dest(svc->ipvs, dest, false); + __ip_vs_del_dest(svc->ipvs, dest, &dest_trash, false); + + ip_vs_trash_save_dests(svc->ipvs, &dest_trash, false); return 0; } @@ -2057,7 +2116,8 @@ ip_vs_edit_service(struct ip_vs_service svc, struct ip_vs_service_user_kern u) - The service must be unlinked, unlocked and not referenced! * - We are called under _bh lock / -static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup) +static void __ip_vs_del_service(struct ip_vs_service svc, + struct list_head dest_trash, bool cleanup) { struct ip_vs_dest dest, nxt; struct ip_vs_scheduler old_sched; @@ -2091,7 +2151,7 @@ static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup) / list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) { __ip_vs_unlink_dest(svc, dest, 0); - __ip_vs_del_dest(svc->ipvs, dest, cleanup); + __ip_vs_del_dest(svc->ipvs, dest, dest_trash, cleanup); } / @@ -2114,7 +2174,8 @@ static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup) / * Unlink a service from list and try to delete it if its refcnt reached 0 / -static void ip_vs_unlink_service(struct ip_vs_service svc, bool cleanup) +static void ip_vs_unlink_service(struct ip_vs_service svc, + struct list_head dest_trash, bool cleanup) { ip_vs_unregister_conntrack(svc); /* Hold svc to avoid double release from dest_trash / @@ -2124,7 +2185,7 @@ static void ip_vs_unlink_service(struct ip_vs_service svc, bool cleanup) / ip_vs_svc_unhash(svc); - __ip_vs_del_service(svc, cleanup); + __ip_vs_del_service(svc, dest_trash, cleanup); } / @@ -2134,12 +2195,14 @@ static int ip_vs_del_service(struct ip_vs_service svc) { struct netns_ipvs ipvs; struct ip_vs_rht t, p; + LIST_HEAD(dest_trash); int ns; if (svc == NULL) return -EEXIST; ipvs = svc->ipvs; - ip_vs_unlink_service(svc, false); + ip_vs_unlink_service(svc, &dest_trash, false); + ip_vs_trash_save_dests(ipvs, &dest_trash, false); /* Drop the table if no more services / ns = ip_vs_get_num_services(ipvs); @@ -2190,6 +2253,7 @@ static int ip_vs_flush(struct netns_ipvs ipvs, bool cleanup) struct hlist_bl_node ne; struct hlist_bl_node e; struct ip_vs_rht t, p; + LIST_HEAD(dest_trash); /* Stop the resizer and drop the tables / if (!test_and_set_bit(IP_VS_WORK_SVC_NORESIZE, &ipvs->work_flags)) @@ -2199,8 +2263,9 @@ static int ip_vs_flush(struct netns_ipvs ipvs, bool cleanup) if (ip_vs_get_num_services(ipvs)) { ip_vs_rht_walk_buckets(ipvs->svc_table, head) { hlist_bl_for_each_entry_safe(svc, e, ne, head, s_list) - ip_vs_unlink_service(svc, cleanup); + ip_vs_unlink_service(svc, &dest_trash, cleanup); } + ip_vs_trash_save_dests(ipvs, &dest_trash, cleanup); } /* Unregister the hash table and release it after RCU grace period / diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c index fb8af6b15a3999..83d1443ebe01e5 100644 --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c @@ -30,6 +30,7 @@ sctp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, sch = skb_header_pointer(skb, iph->len + sizeof(_sctph), sizeof(_schunkh), &_schunkh); if (sch) { + / Accept packet without scheduling? / if (sch->type == SCTP_CID_ABORT \|\| !(sysctl_sloppy_sctp(ipvs) \|\| sch->type == SCTP_CID_INIT)) @@ -47,6 +48,10 @@ sctp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, return 0; } + / Do not create connection for port 0, skip the packet / + if (!ports[0] \|\| !ports[1]) + return 1; + if (likely(!ip_vs_iph_inverse(iph))) svc = ip_vs_service_find(ipvs, af, skb->mark, iph->protocol, &iph->daddr, ports[1]); diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c index fec0e8b47b7165..2e55b62445c60c 100644 --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c @@ -48,6 +48,7 @@ tcp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, if (likely(!ip_vs_iph_icmp(iph))) { th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); if (th) { + / Accept packet without scheduling? / if (th->rst \|\| !(sysctl_sloppy_tcp(ipvs) \|\| th->syn)) return 1; ports = &th->source; @@ -62,6 +63,10 @@ tcp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, return 0; } + / Do not create connection for port 0, skip the packet / + if (!ports[0] \|\| !ports[1]) + return 1; + / No !th->ack check to allow scheduling on SYN+ACK for Active FTP / if (likely(!ip_vs_iph_inverse(iph))) diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c index f32785682402dd..92c0b76c1a021a 100644 --- a/net/netfilter/ipvs/ip_vs_proto_udp.c +++ b/net/netfilter/ipvs/ip_vs_proto_udp.c @@ -52,6 +52,10 @@ udp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, return 0; } + / Do not create connection for port 0, skip the packet / + if (!ports[0] \|\| !ports[1]) + return 1; + if (likely(!ip_vs_iph_inverse(iph))) svc = ip_vs_service_find(ipvs, af, skb->mark, iph->protocol, &iph->daddr, ports[1]); diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c index 06242c86e1dc83..e9e796bda57715 100644 --- a/net/netfilter/nf_conntrack_expect.c +++ b/net/netfilter/nf_conntrack_expect.c @@ -299,13 +299,22 @@ void nf_ct_unexpect_related(struct nf_conntrack_expect exp) } EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); -/* We don't increase the master conntrack refcount for non-fulfilled - * conntracks. During the conntrack destruction, the expectations are - * always killed before the conntrack itself / +/* + * nf_ct_expect_alloc - allocate a new conntrack expectation + * @me: The conntrack to be used as master. + * + * The master conntrack refcount is not incremented; expectations + * are always killed before the master conntrack is destroyed. + * + * Returns a new expectation on success or NULL on failure. + / struct nf_conntrack_expect nf_ct_expect_alloc(struct nf_conn me) { struct nf_conntrack_expect new; + if (!nf_ct_master_acceptable(me)) + return NULL; + new = kmem_cache_zalloc(nf_ct_expect_cachep, GFP_ATOMIC); if (!new) return NULL; diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 1f8d94a0524032..30428d520e432b 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -2231,6 +2231,26 @@ ctnetlink_change_conntrack(struct nf_conn ct, return 0; } +static struct nf_conn +ctnetlink_find_get_master(struct net net, const struct nf_conntrack_zone zone, + const struct nf_conntrack_tuple tuple) +{ + struct nf_conntrack_tuple_hash master_h; + struct nf_conn master_ct; + + master_h = nf_conntrack_find_get(net, zone, tuple); + if (!master_h) + return ERR_PTR(-ENOENT); + + master_ct = nf_ct_tuplehash_to_ctrack(master_h); + if (!nf_ct_master_acceptable(master_ct)) { + nf_ct_put(master_ct); + return ERR_PTR(-EMLINK); + } + + return master_ct; +} + static struct nf_conn ctnetlink_create_conntrack(struct net net, const struct nf_conntrack_zone zone, @@ -2356,7 +2376,6 @@ ctnetlink_create_conntrack(struct net net, / setup master conntrack: this is a confirmed expectation / if (cda[CTA_TUPLE_MASTER]) { struct nf_conntrack_tuple master; - struct nf_conntrack_tuple_hash master_h; struct nf_conn master_ct; err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, @@ -2364,12 +2383,11 @@ ctnetlink_create_conntrack(struct net net, if (err < 0) goto err2; - master_h = nf_conntrack_find_get(net, zone, &master); - if (master_h == NULL) { - err = -ENOENT; + master_ct = ctnetlink_find_get_master(net, zone, &master); + if (IS_ERR(master_ct)) { + err = PTR_ERR(master_ct); goto err2; } - master_ct = nf_ct_tuplehash_to_ctrack(master_h); __set_bit(IPS_EXPECTED_BIT, &ct->status); ct->master = master_ct; } @@ -3613,7 +3631,6 @@ ctnetlink_create_expect(struct net net, u_int8_t u3, u32 portid, int report) { struct nf_conntrack_tuple tuple, mask, master_tuple; - struct nf_conntrack_tuple_hash h = NULL; struct nf_conntrack_expect exp; struct nf_conn ct; int err; @@ -3633,10 +3650,9 @@ ctnetlink_create_expect(struct net net, return err; / Look for master conntrack of this expectation / - h = nf_conntrack_find_get(net, zone, &master_tuple); - if (!h) - return -ENOENT; - ct = nf_ct_tuplehash_to_ctrack(h); + ct = ctnetlink_find_get_master(net, zone, &master_tuple); + if (IS_ERR(ct)) + return PTR_ERR(ct); rcu_read_lock(); exp = ctnetlink_alloc_expect(cda, ct, NULL, &tuple, &mask); diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 64bc440b1181f1..b05dc8858d094d 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -701,9 +701,9 @@ static int ct_sip_parse_transport(struct nf_conn ct, const char dptr, if (ct_sip_parse_param(ct, dptr, dataoff, datalen, "transport=", &matchoff, &matchlen)) { - if (!strncasecmp(dptr + matchoff, "TCP", strlen("TCP"))) + if (matchlen >= 3 && !strncasecmp(dptr + matchoff, "TCP", 3)) proto = IPPROTO_TCP; - else if (!strncasecmp(dptr + matchoff, "UDP", strlen("UDP"))) + else if (matchlen >= 3 && !strncasecmp(dptr + matchoff, "UDP", 3)) proto = IPPROTO_UDP; else return 0; diff --git a/net/netfilter/nf_dup_netdev.c b/net/netfilter/nf_dup_netdev.c index c6bd5c29bed66d..918716629c1556 100644 --- a/net/netfilter/nf_dup_netdev.c +++ b/net/netfilter/nf_dup_netdev.c @@ -12,6 +12,7 @@ #include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_offload.h> #include <net/netfilter/nf_dup_netdev.h> +#include <net/netfilter/nf_recursion.h> static void nf_do_netdev_egress(struct sk_buff skb, struct net_device dev, enum nf_dev_hooks hook) diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 0d72dc8ae47a13..2aa2647ed9df06 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -544,6 +544,7 @@ static void nf_flow_table_extend_ct_timeout(struct nf_conn ct) switch (l4proto) { case IPPROTO_UDP: + case IPPROTO_GRE: new_timeout = NF_CT_DAY; break; case IPPROTO_TCP: diff --git a/net/netfilter/nf_nat_masquerade.c b/net/netfilter/nf_nat_masquerade.c index 4de6e0a517015b..c2a85bd84af131 100644 --- a/net/netfilter/nf_nat_masquerade.c +++ b/net/netfilter/nf_nat_masquerade.c @@ -62,8 +62,7 @@ nf_nat_masquerade_ipv4(struct sk_buff skb, unsigned int hooknum, nat->masq_index = out->ifindex; / Transfer from original range. / - memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); - memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + memset(&newrange, 0, sizeof(newrange)); newrange.flags = range->flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr.ip = newsrc; newrange.max_addr.ip = newsrc; @@ -242,6 +241,7 @@ nf_nat_masquerade_ipv6(struct sk_buff skb, const struct nf_nat_range2 range, if (nat) nat->masq_index = out->ifindex; + memset(&newrange, 0, sizeof(newrange)); newrange.flags = range->flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr.in6 = src; newrange.max_addr.in6 = src; diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c index 166d05e994ac6c..bd603e3a99a59d 100644 --- a/net/netfilter/nf_queue.c +++ b/net/netfilter/nf_queue.c @@ -219,6 +219,7 @@ static int __nf_queue(struct sk_buff skb, const struct nf_hook_state state, entry = (struct nf_queue_entry) { .skb = skb, .skb_dev = skb->dev, + .in_nf_duplicate = current->in_nf_duplicate, .state = state, .hook_index = index, .size = sizeof(entry) + route_key_size, diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 59ac623e6805f1..8b94b5e7dbdbd0 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -760,16 +760,6 @@ static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule) if (trans == NULL) return -ENOMEM; - if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) { - flow = nft_flow_rule_create(ctx->net, rule); - if (IS_ERR(flow)) { - nft_trans_destroy(trans); - return PTR_ERR(flow); - } - - nft_trans_flow_rule(trans) = flow; - } - err = nf_tables_delrule_deactivate(ctx, rule); if (err < 0) { nft_trans_destroy(trans); @@ -777,6 +767,14 @@ static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule) } nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE); + if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) { + flow = nft_flow_rule_create(ctx->net, rule); + if (IS_ERR(flow)) + return PTR_ERR(flow); + + nft_trans_flow_rule(trans) = flow; + } + return 0; } @@ -4570,8 +4568,7 @@ static int nf_tables_newrule(struct sk_buff skb, const struct nfnl_info info, err_destroy_flow_rule: nft_use_dec_restore(&chain->use); err_destroy_flow: - if (flow) - nft_flow_rule_destroy(flow); + nft_flow_rule_destroy(flow); err_release_rule: nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR); nf_tables_rule_destroy(&ctx, rule); diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c index 0ac3c26dfb3d16..48b9e58e0c44f1 100644 --- a/net/netfilter/nf_tables_offload.c +++ b/net/netfilter/nf_tables_offload.c @@ -148,6 +148,9 @@ void nft_flow_rule_destroy(struct nft_flow_rule flow) struct flow_action_entry entry; int i; + if (!flow) + return; + flow_action_for_each(i, entry, &flow->rule->action) { switch (entry->id) { case FLOW_ACTION_REDIRECT: diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 90d887546f7db1..a8aa7ad832c3f3 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -44,6 +44,7 @@ #include <net/sock.h> #include <net/tcp_states.h> #include <net/netfilter/nf_queue.h> +#include <net/net_debug.h> #include <net/netns/generic.h> #include <linux/atomic.h> @@ -365,21 +366,30 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict) const struct nf_hook_entry hook_entry; const struct nf_hook_entries hooks; struct sk_buff skb = entry->skb; + bool old_in_nf_duplicate; const struct net net; unsigned int i; int err; u8 pf; + DEBUG_NET_WARN_ONCE(current->in_nf_duplicate && + !entry->in_nf_duplicate, + "%s called with unexpected duplication guard", + __func__); + local_bh_disable(); + old_in_nf_duplicate = current->in_nf_duplicate; + net = entry->state.net; pf = entry->state.pf; + current->in_nf_duplicate = entry->in_nf_duplicate; hooks = nf_hook_entries_head(net, pf, entry->state.hook); i = entry->hook_index; if (!hooks \|\| i >= hooks->num_hook_entries) { kfree_skb_reason(skb, SKB_DROP_REASON_NETFILTER_DROP); nf_queue_entry_free(entry); - return; + goto out; } hook_entry = &hooks->hooks[i]; @@ -402,9 +412,7 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict) switch (verdict & NF_VERDICT_MASK) { case NF_ACCEPT: case NF_STOP: - local_bh_disable(); entry->state.okfn(entry->state.net, entry->state.sk, skb); - local_bh_enable(); break; case NF_QUEUE: err = nf_queue(skb, &entry->state, i, verdict); @@ -418,6 +426,9 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict) } nf_queue_entry_free(entry); +out: + current->in_nf_duplicate = old_in_nf_duplicate; + local_bh_enable(); } / return true if the entry has an unconfirmed conntrack attached that isn't owned by us diff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c index a48c2f765bbaad..7447da931a9576 100644 --- a/net/netfilter/nft_fwd_netdev.c +++ b/net/netfilter/nft_fwd_netdev.c @@ -14,6 +14,7 @@ #include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_offload.h> #include <net/netfilter/nf_dup_netdev.h> +#include <net/netfilter/nf_recursion.h> #include <net/neighbour.h> #include <net/ip.h> diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c index fbe1750f1ca232..9d685899da7018 100644 --- a/net/netfilter/nft_set_rbtree.c +++ b/net/netfilter/nft_set_rbtree.c @@ -953,7 +953,8 @@ static void nft_rbtree_gc_queue(struct nft_set set) } gc = nft_trans_gc_catchall_sync(gc); - nft_trans_gc_queue_sync_done(gc); + if (gc) + nft_trans_gc_queue_sync_done(gc); } static u64 nft_rbtree_privsize(const struct nlattr const nla[], diff --git a/net/netfilter/xt_NETMAP.c b/net/netfilter/xt_NETMAP.c index 7da065a472e0ec..8bcb3f716d68aa 100644 --- a/net/netfilter/xt_NETMAP.c +++ b/net/netfilter/xt_NETMAP.c @@ -44,6 +44,7 @@ netmap_tg6(struct sk_buff skb, const struct xt_action_param par) netmask.ip6[i]; } + memset(&newrange, 0, sizeof(newrange)); newrange.flags = range->flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr = new_addr; newrange.max_addr = new_addr; @@ -91,8 +92,7 @@ netmap_tg4(struct sk_buff skb, const struct xt_action_param par) new_ip = ip_hdr(skb)->saddr & ~netmask; new_ip \|= mr->range[0].min_ip & netmask; - memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); - memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + memset(&newrange, 0, sizeof(newrange)); newrange.flags = mr->range[0].flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr.ip = new_ip; newrange.max_addr.ip = new_ip; diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index 55f1f2d89952d0..00cccf003cff5e 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -650,14 +650,15 @@ static void __net_exit recent_proc_net_exit(struct net net) / recent_net_exit() is called before recent_mt_destroy(). Make sure * that the parent xt_recent proc entry is empty before trying to - * remove it. + * remove it. Use recent_mutex instead of recent_lock since + * remove_proc_entry() may sleep. */ - spin_lock_bh(&recent_lock); + mutex_lock(&recent_mutex); list_for_each_entry(t, &recent_net->tables, list) remove_proc_entry(t->name, recent_net->xt_recent); recent_net->xt_recent = NULL; - spin_unlock_bh(&recent_lock); + mutex_unlock(&recent_mutex); remove_proc_entry("xt_recent", net->proc_net); }
3/2	2026/11/02 05:55	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18404 output: 106 thoughts: 1571 Thoughts: Analysis of the Network Filter Patch Series Okay, let's break this down. This patch series touches a lot of interesting areas within the networking stack, specifically around netfilter, IPVS, and nftables. My first thought is "This is definitely worth a deep dive for fuzzing". The modifications are spread across various components, each warranting careful consideration. 1. Recursion Protection: Extending the recursion protection to `nf_send_reset` and `nf_send_reset6` makes sense for robustness. 2. IPVS Fixes: The IPVS fixes related to RCU grace periods, memory management (`kfree_rcu`), port 0 checks, and netns initialization are crucial, as concurrency bugs are insidious and memory leaks, especially within this subsystem, can lead to significant issues. The mutex use within IPVS needs careful analysis. 3. Expectation Chain Depth Limiting: The expectation chain depth limit with `NF_CT_MAX_EXPECT_CHAIN_LEN` should enhance stability and prevent DoS vulnerabilities related to connection tracking. This is something worth testing to ensure the chosen depth is sane in practice. 4. Queueing: Saving and restoring `in_nf_duplicate` across queueing calls is smart to maintain consistency. 5. Bridge Conntrack Warning: The change from `WARN_ON_ONCE` to `DEBUG_NET_WARN_ON_ONCE` on the bridge conntrack is a standard debugging refinement. 6. Iptables Fixes: The uninitialized variable fix in the tables is a clear bugfix, making these areas more robust. 7. SIP Buffer Overflow Check: The fix for a possible buffer overflow in `nf_conntrack_sip.c` is important. 8. GRE Protocol Timeout: Adding `IPPROTO_GRE` to `nf_flow_table_extend_ct_timeout` expands the protocol coverage for the flow table. 9. NAT Initialization: Zeroing out the `newrange` struct in NAT and NETMAP ensures the `newrange` is properly initialized. 10. Nftables Reordering: Reordering the `NFT_CHAIN_HW_OFFLOAD` check in `nft_delrule` is a subtle but potentially important change related to offloading. The NULL check in `nft_flow_rule_destroy` is a defensive programming practice. 11. RBTree Sync: The RBTree sync is related to memory management synchronization. 12. Recent Mutex: The change from a spinlock to a mutex in `xt_recent.c` shows potential for concurrency fixes. Given my experience, I see these areas as directly reachable via standard networking APIs: socket syscalls, netlink, iptables, tun/tap devices, and network namespaces. Thus, the "WorthFuzzing" flag is definitively TRUE. Now, let's get into the specifics for enabling and targeting: 1. EnableConfigs: I need to look into the Kconfig files for each of these modified components. I'll use `grepper` to quickly determine which configurations enable the affected code. This is a critical first step. 2. FocusSymbols: I'm going to extract specific kernel functions that are directly implementing the changes made in this patch series. My goal is to avoid listing generic, ubiquitous functions like allocators or synchronization primitives. I need to focus on the specific logic. I need to focus on: * API entrypoints like `ip_vs_new_conn_out`, and the various `ip_vs_proto_.c` functions. Functions that implement the recursion protection mechanisms like `nf_xmit_skb_recursion`. * Functions related to connection tracking: `nf_ct_expect_alloc`, `ctnetlink_find_get_master`, etc. * Functions involved in nftables rule manipulation and flow table extension. I must remember to account for statically inlined functions; the compiler won't produce a symbol for those so I need to identify the non-static callers within the .c files.
4/2	2026/11/02 05:55	tool	grepper	0m Args: { "Expression": "config (NETFILTER\|IP_VS\|NF_CONNTRACK\|NETFILTER_XT_MATCH_RECENT\|NF_TABLES\|NETFILTER_NETLINK_QUEUE\|NF_REJECT_IPV4\|NF_REJECT_IPV6)", "PathPrefixes": [ "net/netfilter/Kconfig", "net/ipv4/netfilter/Kconfig", "net/ipv6/netfilter/Kconfig" ] } Results: { "Output": "\nFull output is too long, showing 200 out of 506 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (3 files in total):\nnet/ipv4/netfilter/Kconfig:3\nnet/ipv6/netfilter/Kconfig:2\nnet/netfilter/Kconfig:118\n\nnet/ipv4/netfilter/Kconfig=33=if NF_TABLES\nnet/ipv4/netfilter/Kconfig-34-\nnet/ipv4/netfilter/Kconfig:35:config NF_TABLES_IPV4\nnet/ipv4/netfilter/Kconfig-36-\tbool \"IPv4 nf_tables support\"\n--\nnet/ipv4/netfilter/Kconfig=62=endif # NF_TABLES_IPV4\nnet/ipv4/netfilter/Kconfig-63-\nnet/ipv4/netfilter/Kconfig:64:config NF_TABLES_ARP\nnet/ipv4/netfilter/Kconfig-65-\tbool \"ARP nf_tables support\"\n--\nnet/ipv4/netfilter/Kconfig=87=config NF_LOG_IPV4\n--\nnet/ipv4/netfilter/Kconfig-94-\nnet/ipv4/netfilter/Kconfig:95:config NF_REJECT_IPV4\nnet/ipv4/netfilter/Kconfig-96-\ttristate \"IPv4 packet rejection\"\n--\nnet/ipv6/netfilter/Kconfig=29=if NF_TABLES\nnet/ipv6/netfilter/Kconfig-30-\nnet/ipv6/netfilter/Kconfig:31:config NF_TABLES_IPV6\nnet/ipv6/netfilter/Kconfig-32-\tbool \"IPv6 nf_tables support\"\n--\nnet/ipv6/netfilter/Kconfig=61=config NF_DUP_IPV6\n--\nnet/ipv6/netfilter/Kconfig-67-\nnet/ipv6/netfilter/Kconfig:68:config NF_REJECT_IPV6\nnet/ipv6/netfilter/Kconfig-69-\ttristate \"IPv6 packet rejection\"\n--\nnet/netfilter/Kconfig=2=menu \"Core Netfilter Configuration\"\n--\nnet/netfilter/Kconfig-4-\nnet/netfilter/Kconfig:5:config NETFILTER_INGRESS\nnet/netfilter/Kconfig-6-\tbool \"Netfilter ingress support\"\n--\nnet/netfilter/Kconfig-12-\nnet/netfilter/Kconfig:13:config NETFILTER_EGRESS\nnet/netfilter/Kconfig-14-\tbool \"Netfilter egress support\"\n--\nnet/netfilter/Kconfig-20-\nnet/netfilter/Kconfig:21:config NETFILTER_SKIP_EGRESS\nnet/netfilter/Kconfig-22-\tdef_bool NETFILTER_EGRESS \u0026\u0026 (NET_CLS_ACT \|\| IFB)\nnet/netfilter/Kconfig-23-\nnet/netfilter/Kconfig:24:config NETFILTER_NETLINK\nnet/netfilter/Kconfig-25-\tbool\nnet/netfilter/Kconfig-26-\nnet/netfilter/Kconfig:27:config NETFILTER_FAMILY_BRIDGE\nnet/netfilter/Kconfig-28-\tbool\nnet/netfilter/Kconfig-29-\nnet/netfilter/Kconfig:30:config NETFILTER_FAMILY_ARP\nnet/netfilter/Kconfig-31-\tbool\nnet/netfilter/Kconfig-32-\nnet/netfilter/Kconfig:33:config NETFILTER_BPF_LINK\nnet/netfilter/Kconfig-34-\tdef_bool BPF_SYSCALL\nnet/netfilter/Kconfig-35-\nnet/netfilter/Kconfig:36:config NETFILTER_NETLINK_HOOK\nnet/netfilter/Kconfig-37-\ttristate \"Netfilter base hook dump support\"\n--\nnet/netfilter/Kconfig-45-\nnet/netfilter/Kconfig:46:config NETFILTER_NETLINK_ACCT\nnet/netfilter/Kconfig-47-\ttristate \"Netfilter NFACCT over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-53-\nnet/netfilter/Kconfig:54:config NETFILTER_NETLINK_QUEUE\nnet/netfilter/Kconfig-55-\ttristate \"Netfilter NFQUEUE over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-61-\nnet/netfilter/Kconfig:62:config NETFILTER_NETLINK_LOG\nnet/netfilter/Kconfig-63-\ttristate \"Netfilter LOG over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-73-\nnet/netfilter/Kconfig:74:config NETFILTER_NETLINK_OSF\nnet/netfilter/Kconfig-75-\ttristate \"Netfilter OSF over NFNETLINK interface\"\n--\nnet/netfilter/Kconfig-81-\nnet/netfilter/Kconfig:82:config NF_CONNTRACK\nnet/netfilter/Kconfig-83-\ttristate \"Netfilter connection tracking support\"\n--\nnet/netfilter/Kconfig=110=if NF_CONNTRACK\nnet/netfilter/Kconfig:111:config NETFILTER_CONNCOUNT\nnet/netfilter/Kconfig-112-\ttristate\nnet/netfilter/Kconfig-113-\nnet/netfilter/Kconfig:114:config NF_CONNTRACK_MARK\nnet/netfilter/Kconfig-115-\tbool 'Connection mark tracking support'\n--\nnet/netfilter/Kconfig-122-\nnet/netfilter/Kconfig:123:config NF_CONNTRACK_SECMARK\nnet/netfilter/Kconfig-124-\tbool 'Connection tracking security mark support'\n--\nnet/netfilter/Kconfig-135-\nnet/netfilter/Kconfig:136:config NF_CONNTRACK_ZONES\nnet/netfilter/Kconfig-137-\tbool 'Connection tracking zones'\n--\nnet/netfilter/Kconfig-147-\nnet/netfilter/Kconfig:148:config NF_CONNTRACK_PROCFS\nnet/netfilter/Kconfig-149-\tbool \"Supply CT list in procfs (OBSOLETE)\"\n--\nnet/netfilter/Kconfig-156-\nnet/netfilter/Kconfig:157:config NF_CONNTRACK_EVENTS\nnet/netfilter/Kconfig-158-\tbool \"Connection tracking events\"\n--\nnet/netfilter/Kconfig-166-\nnet/netfilter/Kconfig:167:config NF_CONNTRACK_TIMEOUT\nnet/netfilter/Kconfig-168-\tbool 'Connection tracking timeout'\n--\nnet/netfilter/Kconfig-176-\nnet/netfilter/Kconfig:177:config NF_CONNTRACK_TIMESTAMP\nnet/netfilter/Kconfig-178-\tbool 'Connection tracking timestamping'\n--\nnet/netfilter/Kconfig-187-\nnet/netfilter/Kconfig:188:config NF_CONNTRACK_LABELS\nnet/netfilter/Kconfig-189-\tbool \"Connection tracking labels\"\n--\nnet/netfilter/Kconfig-194-\nnet/netfilter/Kconfig:195:config NF_CONNTRACK_OVS\nnet/netfilter/Kconfig-196-\tbool\n--\nnet/netfilter/Kconfig=201=config NF_CT_PROTO_SCTP\n--\nnet/netfilter/Kconfig-211-\nnet/netfilter/Kconfig:212:config NF_CONNTRACK_AMANDA\nnet/netfilter/Kconfig-213-\ttristate \"Amanda backup protocol support\"\n--\nnet/netfilter/Kconfig-226-\nnet/netfilter/Kconfig:227:config NF_CONNTRACK_FTP\nnet/netfilter/Kconfig-228-\ttristate \"FTP protocol support\"\n--\nnet/netfilter/Kconfig-238-\nnet/netfilter/Kconfig:239:config NF_CONNTRACK_H323\nnet/netfilter/Kconfig-240-\ttristate \"H.323 protocol support\"\n--\nnet/netfilter/Kconfig-257-\nnet/netfilter/Kconfig:258:config NF_CONNTRACK_IRC\nnet/netfilter/Kconfig-259-\ttristate \"IRC DCC protocol support (obsolete)\"\n--\nnet/netfilter/Kconfig-273-\nnet/netfilter/Kconfig:274:config NF_CONNTRACK_BROADCAST\nnet/netfilter/Kconfig-275-\ttristate\nnet/netfilter/Kconfig-276-\nnet/netfilter/Kconfig:277:config NF_CONNTRACK_NETBIOS_NS\nnet/netfilter/Kconfig-278-\ttristate \"NetBIOS name service protocol support\"\n--\nnet/netfilter/Kconfig-295-\nnet/netfilter/Kconfig:296:config NF_CONNTRACK_SNMP\nnet/netfilter/Kconfig-297-\ttristate \"SNMP service protocol support\"\n--\nnet/netfilter/Kconfig-310-\nnet/netfilter/Kconfig:311:config NF_CONNTRACK_PPTP\nnet/netfilter/Kconfig-312-\ttristate \"PPtP protocol support (deprecated)\"\n--\nnet/netfilter/Kconfig-329-\nnet/netfilter/Kconfig:330:config NF_CONNTRACK_SANE\nnet/netfilter/Kconfig-331-\ttristate \"SANE protocol support\"\n--\nnet/netfilter/Kconfig-342-\nnet/netfilter/Kconfig:343:config NF_CONNTRACK_SIP\nnet/netfilter/Kconfig-344-\ttristate \"SIP protocol support\"\n--\nnet/netfilter/Kconfig-354-\nnet/netfilter/Kconfig:355:config NF_CONNTRACK_TFTP\nnet/netfilter/Kconfig-356-\ttristate \"TFTP protocol support\"\n--\nnet/netfilter/Kconfig=385=config NF_CT_NETLINK_HELPER\n--\nnet/netfilter/Kconfig-397-\nnet/netfilter/Kconfig:398:config NETFILTER_NETLINK_GLUE_CT\nnet/netfilter/Kconfig-399-\tbool \"NFQUEUE and NFLOG integration with Connection Tracking\"\n--\nnet/netfilter/Kconfig=447=config NF_NAT_OVS\n--\nnet/netfilter/Kconfig-449-\nnet/netfilter/Kconfig:450:config NETFILTER_SYNPROXY\nnet/netfilter/Kconfig-451-\ttristate\n--\nnet/netfilter/Kconfig=453=endif # NF_CONNTRACK\nnet/netfilter/Kconfig-454-\nnet/netfilter/Kconfig:455:config NF_TABLES\nnet/netfilter/Kconfig-456-\tselect NETFILTER_NETLINK\n--\nnet/netfilter/Kconfig=471=if NF_TABLES\nnet/netfilter/Kconfig:472:config NF_TABLES_INET\nnet/netfilter/Kconfig-473-\tdepends on IPV6\n--\nnet/netfilter/Kconfig-479-\nnet/netfilter/Kconfig:480:config NF_TABLES_NETDEV\nnet/netfilter/Kconfig-481-\tbool \"Netfilter nf_tables netdev tables support\"\n--\nnet/netfilter/Kconfig=721=config NF_FLOW_TABLE_PROCFS\n--\nnet/netfilter/Kconfig-728-\nnet/netfilter/Kconfig:729:config NETFILTER_XTABLES\nnet/netfilter/Kconfig-730-\ttristate \"Netfilter Xtables support (required for ip_tables)\"\n--\nnet/netfilter/Kconfig=736=if NETFILTER_XTABLES\nnet/netfilter/Kconfig-737-\nnet/netfilter/Kconfig:738:config NETFILTER_XTABLES_COMPAT\nnet/netfilter/Kconfig-739-\tbool \"Netfilter Xtables 32bit support\"\n--\nnet/netfilter/Kconfig-746-\nnet/netfilter/Kconfig:747:config NETFILTER_XTABLES_LEGACY\nnet/netfilter/Kconfig-748-\tbool \"Netfilter legacy tables support\"\n--\n\n" }
5/2	2026/11/02 05:55	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24065 output: 33 thoughts: 15 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Diving Deeper: IPVS Configuration Alright, before I finalize anything, I need to be thorough. I've been focusing on the core aspects, but I should probably double-check the configuration of IPVS. It's too easy to miss something that causes a subtle issue down the line. That means a deep dive into the `Makefile` and `Kconfig` files that relate to the IPVS implementation. I'm looking for anything that might impact its build options, dependencies, or default settings. I'm going to scan for things like conditional compilation flags, module loading directives, or any hidden dependencies on other kernel components. I'll need to make sure everything's set up exactly as I expect, with all the necessary modules either built-in or properly configured for dynamic loading. Gotta ensure no unexpected interactions or conflicts there. This kind of upfront diligence will save headaches later, especially when dealing with complex networking setups.
6/2	2026/11/02 05:55	tool	grepper	0m Args: { "Expression": "config IP_VS", "PathPrefixes": [ "net/netfilter/ipvs/" ] } Results: { "Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n--\nnet/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n" }
7/2	2026/11/02 05:55	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24595 output: 36 thoughts: 993 Thoughts: Kconfig Configuration Analysis for Modified Files Okay, let's break down these modifications and figure out the associated Kconfig options. First, I'll go file by file. Starting with `include/linux/netdevice_xmit.h`, the preprocessor directive `#if IS_ENABLED(CONFIG_NETFILTER)` jumps out immediately. Makes sense; network filtering hooks are likely in play. Next, I see `include/net/ip_vs.h`, and that's obviously governed by `CONFIG_IP_VS`. Moving on, `include/net/netfilter/nf_conntrack_helper.h` relies on `CONFIG_NF_CONNTRACK`. Similar pattern: `include/net/netfilter/nf_dup_netdev.h` is controlled by `CONFIG_NF_DUP_NETDEV`, and `include/net/netfilter/nf_queue.h` is tied to `CONFIG_NETFILTER_NETLINK_QUEUE` or, alternatively, just `CONFIG_NETFILTER`. The `nf_recursion.h` header seems like it's a helper; I'll skip that one for now. Now, we have `net/bridge/netfilter/nf_conntrack_bridge.c`. Since that's a source file, I'll need to check the `Makefile` in that directory to get the configuration options. I'll make a mental note to do that. For `net/ipv4/netfilter/arp_tables.c`, the Kconfig option is `CONFIG_IP_NF_ARPTABLES`. Then we have `net/ipv4/netfilter/ip_tables.c`, which uses `CONFIG_IP_NF_IPTABLES`. Similarly, `net/ipv4/netfilter/nf_reject_ipv4.c` uses `CONFIG_NF_REJECT_IPV4`. And, following that pattern, `net/ipv6/netfilter/ip6_tables.c` uses `CONFIG_IP6_NF_IPTABLES`, and `net/ipv6/netfilter/nf_reject_ipv6.c` uses `CONFIG_NF_REJECT_IPV6`. Now, the `net/netfilter/ipvs/*` directory is interesting because it contains multiple files: `ip_vs_app.c`, `ip_vs_core.c`, `ip_vs_ctl.c`, `ip_vs_proto_sctp.c`, `ip_vs_proto_tcp.c`, and `ip_vs_proto_udp.c`. It's likely that a common option controls the core functionality, `CONFIG_IP_VS`, and others define options for specific protocols. Indeed, it looks like `CONFIG_IP_VS`, `CONFIG_IP_VS_PROTO_TCP`, `CONFIG_IP_VS_PROTO_UDP`, and `CONFIG_IP_VS_PROTO_SCTP` apply. Moving on, `net/netfilter/nf_conntrack_expect.c` requires `CONFIG_NF_CONNTRACK`, and `net/netfilter/nf_conntrack_netlink.c` needs `CONFIG_NF_CT_NETLINK`. Similarly, `net/netfilter/nf_conntrack_sip.c` relies on `CONFIG_NF_CONNTRACK_SIP`. We have `net/netfilter/nf_dup_netdev.c` needing `CONFIG_NF_DUP_NETDEV`. `net/netfilter/nf_flow_table_core.c` uses `CONFIG_NF_FLOW_TABLE`. And `net/netfilter/nf_nat_masquerade.c` requires `CONFIG_NF_NAT_MASQUERADE`. `net/netfilter/nf_queue.c` is governed by `CONFIG_NETFILTER`. Then, `net/netfilter/nf_tables_api.c` and `net/netfilter/nf_tables_offload.c` are both governed by `CONFIG_NF_TABLES`. `net/netfilter/nfnetlink_queue.c` depends on `CONFIG_NETFILTER_NETLINK_QUEUE`. `net/netfilter/nft_fwd_netdev.c` requires `CONFIG_NFT_FWD_NETDEV`. `net/netfilter/nft_set_rbtree.c` uses `CONFIG_NF_TABLES`, again. Finally, `net/netfilter/xt_NETMAP.c` needs `CONFIG_NETFILTER_XT_TARGET_NETMAP` and `net/netfilter/xt_recent.c` requires `CONFIG_NETFILTER_XT_MATCH_RECENT`. Alright, with that, I've got a good handle on most of the Kconfig
8/2	2026/11/02 05:56	tool	grepper	0m Args: { "Expression": "nf_conntrack_bridge", "PathPrefixes": [ "net/bridge/netfilter/Makefile" ] } Results: { "Output": "net/bridge/netfilter/Makefile=7=obj-$(CONFIG_NFT_BRIDGE_REJECT) += nft_reject_bridge.o\n--\nnet/bridge/netfilter/Makefile-9-# connection tracking\nnet/bridge/netfilter/Makefile:10:obj-$(CONFIG_NF_CONNTRACK_BRIDGE) += nf_conntrack_bridge.o\nnet/bridge/netfilter/Makefile-11-\n" }
9/2	2026/11/02 05:56	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 26758 output: 37 thoughts: 77 Thoughts: Okay, let's dive into this. Here's how I'd approach this IPVS configuration check: Examining IPVS Protocol Kconfig Options Alright, I need to make sure I've got the correct protocol support configured within IPVS. My immediate thought is to verify the Kconfig options that govern the protocols. First up, I should check for the core TCP, UDP, and SCTP options: `CONFIG_IP_VS_PROTO_TCP`, `CONFIG_IP_VS_PROTO_UDP`, and `CONFIG_IP_VS_PROTO_SCTP`. These are likely the building blocks. If I need to support a specific IPVS protocol, these Kconfig options will be critical to enable the required functionality. I'll also need to dig a bit deeper. Given the naming convention and location, it's a safe bet that the complete configuration setup for these protocols will be located under the `net/netfilter/ipvs/Kconfig` file. That's where I will be looking to verify and confirm any related `CONFIG_IP_VS_PROTO_` options that are related to any other IPVS related protocols. This is my starting point for a comprehensive protocol analysis.
10/2	2026/11/02 05:56	tool	grepper	0m Args: { "Expression": "config IP_VS_PROTO", "PathPrefixes": [ "net/netfilter/ipvs/Kconfig" ] } Results: { "Output": "no matches" }
11/2	2026/11/02 05:56	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27141 output: 31 thoughts: 18 Thoughts: Here's my take on that thought process, tailored for an expert like yourself: Diving into the IPVS Makefile Alright, let's get down to brass tacks. I'm going to crack open that `net/netfilter/ipvs/Makefile` and see what the build process and dependencies for IPVS look like. I need to refresh my mental map of how the components fit together and what specific rules are in place. This is where the core logic of the IPVS build process is defined. I'm expecting to see the usual suspects – kernel headers, object file dependencies, module compilation rules, and probably some architecture-specific flags. I’ll be paying close attention to any unusual compilation flags, potential linker tricks, or custom scripts it invokes. My goal is a quick overview of the build environment, and perhaps identify anything that might be an area for further investigation. It will be helpful to see the specific interactions with the kernel's build system.
12/2	2026/11/02 05:56	tool	grepper	0m Args: { "Expression": "proto", "PathPrefixes": [ "net/netfilter/ipvs/Makefile" ] } Results: { "Output": "net/netfilter/ipvs/Makefile-5-\nnet/netfilter/ipvs/Makefile:6:# IPVS transport protocol load balancing support\nnet/netfilter/ipvs/Makefile:7:ip_vs_proto-objs-y :=\nnet/netfilter/ipvs/Makefile:8:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_TCP) += ip_vs_proto_tcp.o\nnet/netfilter/ipvs/Makefile:9:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_UDP) += ip_vs_proto_udp.o\nnet/netfilter/ipvs/Makefile:10:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_AH_ESP) += ip_vs_proto_ah_esp.o\nnet/netfilter/ipvs/Makefile:11:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_SCTP) += ip_vs_proto_sctp.o\nnet/netfilter/ipvs/Makefile-12-\n--\nnet/netfilter/ipvs/Makefile=16=ip_vs-objs :=\tip_vs_conn.o ip_vs_core.o ip_vs_ctl.o ip_vs_sched.o\t \\\nnet/netfilter/ipvs/Makefile-17-\t\tip_vs_xmit.o ip_vs_app.o ip_vs_sync.o\t \t\t \\\nnet/netfilter/ipvs/Makefile:18:\t\tip_vs_est.o ip_vs_proto.o ip_vs_pe.o\t\t\t \\\nnet/netfilter/ipvs/Makefile:19:\t\t$(ip_vs_proto-objs-y) $(ip_vs-extra_objs-y)\nnet/netfilter/ipvs/Makefile-20-\n" }
13/2	2026/11/02 05:56	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27839 output: 36 thoughts: 21 Thoughts: Okay, let's dive into this. Here's my thought process on what I'm about to do: Examining the IPVS Kconfig Options Alright, so the first thing I need to do is get into the weeds of the `net/netfilter/ipvs/Kconfig` file. I'm assuming that this is where the configuration options for IP Virtual Server (IPVS) are defined within the kernel build system. I'm likely looking for the usual suspects - the boolean and tristate options that control which IPVS features are compiled, perhaps some dependencies on other kernel subsystems, and of course, any default values. I'm expecting to find the standard `config` statements, `depends on` clauses, and maybe some help text explaining each option's purpose. I'll need to understand the architecture, so I can see what is available. This will give me a clear picture of what's configurable during the kernel build process. I'm going to pay close attention to the dependencies; knowing what needs to be enabled or disabled alongside a specific IPVS feature will be crucial for understanding its interactions with the rest of the network stack. Once I have the lay of the land, I should be able to make informed decisions about how to configure IPVS for specific use cases.
14/2	2026/11/02 05:56	tool	grepper	0m Args: { "Expression": "config IP_VS_", "PathPrefixes": [ "net/netfilter/ipvs/Kconfig" ] } Results: { "Output": "net/netfilter/ipvs/Kconfig=286=comment 'IPVS SH scheduler'\nnet/netfilter/ipvs/Kconfig-287-\nnet/netfilter/ipvs/Kconfig:288:config IP_VS_SH_TAB_BITS\nnet/netfilter/ipvs/Kconfig-289-\tint \"IPVS source hashing table size (the Nth power of 2)\"\n--\nnet/netfilter/ipvs/Kconfig=301=comment 'IPVS MH scheduler'\nnet/netfilter/ipvs/Kconfig-302-\nnet/netfilter/ipvs/Kconfig:303:config IP_VS_MH_TAB_INDEX\nnet/netfilter/ipvs/Kconfig-304-\tint \"IPVS maglev hashing table index of size (the prime numbers)\"\n" }
15/2	2026/11/02 05:56	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 28378 output: 30 thoughts: 29 Thoughts: Here's my thought process, as if I were thinking it: Digging into the Kernel Configuration Okay, hold on a minute. I need to figure out where `CONFIG_IP_VS_PROTO_TCP` is actually defined within the kernel configuration system. It's not immediately obvious. The best approach is to quickly locate its definition within the source code. Let's see... a quick `grep` is in order. Let's fire that off to search for `IP_VS_PROTO_TCP`. Hopefully, that will give me the information I need, or at least a good starting point.
16/2	2026/11/02 05:57	tool	grepper	0m Args: { "Expression": "IP_VS_PROTO_TCP", "PathPrefixes": [ "net/" ] } Results: { "Output": "net/netfilter/ipvs/Kconfig=77=comment \"IPVS transport protocol load balancing support\"\nnet/netfilter/ipvs/Kconfig-78-\nnet/netfilter/ipvs/Kconfig:79:config\tIP_VS_PROTO_TCP\nnet/netfilter/ipvs/Kconfig-80-\tbool \"TCP load balancing support\"\n--\nnet/netfilter/ipvs/Kconfig=321=config\tIP_VS_FTP\nnet/netfilter/ipvs/Kconfig-322-\ttristate \"FTP protocol helper\"\nnet/netfilter/ipvs/Kconfig:323:\tdepends on IP_VS_PROTO_TCP \u0026\u0026 NF_CONNTRACK \u0026\u0026 NF_NAT \u0026\u0026 \\\nnet/netfilter/ipvs/Kconfig-324-\t\tNF_CONNTRACK_FTP\n--\nnet/netfilter/ipvs/Makefile=7=ip_vs_proto-objs-y :=\nnet/netfilter/ipvs/Makefile:8:ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_TCP) += ip_vs_proto_tcp.o\nnet/netfilter/ipvs/Makefile-9-ip_vs_proto-objs-$(CONFIG_IP_VS_PROTO_UDP) += ip_vs_proto_udp.o\n--\nnet/netfilter/ipvs/ip_vs_core.c=60=EXPORT_SYMBOL(ip_vs_conn_out_get);\nnet/netfilter/ipvs/ip_vs_core.c:61:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_core.c-62-EXPORT_SYMBOL(ip_vs_tcp_conn_listen);\n--\nnet/netfilter/ipvs/ip_vs_core.c=68=EXPORT_SYMBOL(ip_vs_new_conn_out);\nnet/netfilter/ipvs/ip_vs_core.c-69-\nnet/netfilter/ipvs/ip_vs_core.c:70:#if defined(CONFIG_IP_VS_PROTO_TCP) \u0026\u0026 defined(CONFIG_IP_VS_PROTO_UDP)\nnet/netfilter/ipvs/ip_vs_core.c-71-#define SNAT_CALL(f, ...) \\\nnet/netfilter/ipvs/ip_vs_core.c-72-\tINDIRECT_CALL_2(f, tcp_snat_handler, udp_snat_handler, __VA_ARGS__)\nnet/netfilter/ipvs/ip_vs_core.c:73:#elif defined(CONFIG_IP_VS_PROTO_TCP)\nnet/netfilter/ipvs/ip_vs_core.c-74-#define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, tcp_snat_handler, __VA_ARGS__)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3421=static int ip_vs_set_timeout(struct netns_ipvs ipvs, struct ip_vs_timeout_user u)\nnet/netfilter/ipvs/ip_vs_ctl.c-3422-{\nnet/netfilter/ipvs/ip_vs_ctl.c:3423:#if defined(CONFIG_IP_VS_PROTO_TCP) \|\| defined(CONFIG_IP_VS_PROTO_UDP)\nnet/netfilter/ipvs/ip_vs_ctl.c-3424-\tstruct ip_vs_proto_data pd;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3431-\nnet/netfilter/ipvs/ip_vs_ctl.c:3432:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-3433-\tif (u-\u003etcp_timeout \u003c 0 \|\| u-\u003etcp_timeout \u003e (INT_MAX / HZ) \|\|\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3443-\nnet/netfilter/ipvs/ip_vs_ctl.c:3444:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-3445-\tif (u-\u003etcp_timeout) {\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3805=__ip_vs_get_timeouts(struct netns_ipvs ipvs, struct ip_vs_timeout_user u)\nnet/netfilter/ipvs/ip_vs_ctl.c-3806-{\nnet/netfilter/ipvs/ip_vs_ctl.c:3807:#if defined(CONFIG_IP_VS_PROTO_TCP) \|\| defined(CONFIG_IP_VS_PROTO_UDP)\nnet/netfilter/ipvs/ip_vs_ctl.c-3808-\tstruct ip_vs_proto_data pd;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3812-\nnet/netfilter/ipvs/ip_vs_ctl.c:3813:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-3814-\tpd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=4883=static int ip_vs_genl_get_cmd(struct sk_buff skb, struct genl_info info)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4940-\t\t__ip_vs_get_timeouts(ipvs, \u0026t);\nnet/netfilter/ipvs/ip_vs_ctl.c:4941:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_ctl.c-4942-\t\tif (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,\n--\nnet/netfilter/ipvs/ip_vs_proto.c=295=int __net_init ip_vs_protocol_net_init(struct netns_ipvs ipvs)\n--\nnet/netfilter/ipvs/ip_vs_proto.c-298-\tstatic struct ip_vs_protocol protos[] = {\nnet/netfilter/ipvs/ip_vs_proto.c:299:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_proto.c-300- \u0026ip_vs_protocol_tcp,\n--\nnet/netfilter/ipvs/ip_vs_proto.c=340=int __init ip_vs_protocol_init(void)\n--\nnet/netfilter/ipvs/ip_vs_proto.c-349-\nnet/netfilter/ipvs/ip_vs_proto.c:350:#ifdef CONFIG_IP_VS_PROTO_TCP\nnet/netfilter/ipvs/ip_vs_proto.c-351-\tREGISTER_PROTOCOL(\u0026ip_vs_protocol_tcp);\n" }
17/2	2026/11/02 05:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30299 output: 48 thoughts: 2211 Thoughts: Analysis of Kernel Network Filter Changes Alright, let's dive into these changes and figure out their implications. First, I'm going to look at each modified file and try to extract the key function symbols and configurations relevant to me. I need to understand what's been changed, why, and how these changes might impact the system. I see a renaming of `nf_dup_skb_recursion` to `nf_xmit_skb_recursion` – interesting. This looks like a refinement related to netfilter recursion, possibly to handle different types of transmission. The introduction of `nf_dev_xmit_recursion` and related functions in `nf_recursion.h` with their use in reset functions for IPv4 and IPv6, and also `nf_dup_netdev.c` and `nft_fwd_netdev.c` points to changes in how netfilter handles retransmissions and possible loops. Next, the changes in `ip_vs.h` and `ip_vs_ctl.c` look substantial. The addition of new helpers `ip_vs_trash_` and the usage of `dest_trash` list in various functions (`__ip_vs_del_dest`, `ip_vs_del_dest`, etc.) indicates a change in how destination objects are managed within IPVS, likely around the use of RCU and synchronization. I’ll need to pay close attention to the RCU grace periods and the `need_gp` flags and how these functions interact. The new `lockdep_assert_held` suggests an added layer of debugging and lock assertion too. The `kfree` to `kfree_rcu` in `unregister_ip_vs_app` is a standard pattern for deferring memory freeing with RCU, so that's a straightforward improvement. The checks for null ports in `ip_vs_proto_sctp.c`, `ip_vs_proto_tcp.c`, and `ip_vs_proto_udp.c` look like preventative measures against potential NULL pointer dereferences. Good defensive coding. The inlining of `nf_ct_master_acceptable` and its subsequent checks in `nf_ct_expect_alloc` and `ctnetlink_` functions are intriguing. I need to figure out what defines the `NF_CT_MAX_EXPECT_CHAIN_LEN`, and how this helps with limiting the depth of conntrack expectations. The `DEBUG_NET_WARN_ON_ONCE` change in `nf_ct_bridge_refrag` is just a change in warning style. Moving the `newpos` assignment inside the `t->verdict >= 0` check in `arp_tables.c`, `ip_tables.c`, and `ip6_tables.c` is probably a bug fix and is also defensive. The recursion checks added to the `nf_send_reset` functions are consistent with the earlier recursion changes, to prevent loops. The `ct_sip_parse_transport` change seems to be a minor refinement in SIP parsing for matching the header transport field. The addition of `IPPROTO_GRE` to `nf_flow_table_extend_ct_timeout` is to extend timeouts for GRE protocol. The `memset` calls in `nf_nat_masquerade.c` and `xt_NETMAP.c` suggest clearing structures for safety. The `__nf_queue` and `nf_reinject` changes appear to be related to better handling of duplicate packets in netfilter queues, likely to improve reliability. Reordering offload code in `nft_delrule` and the `nft_flow_rule_destroy` checks and additions are likely related to flow offload functionality within nftables. The `nft_rbtree_gc_queue` check involving `nft_trans_gc_queue_sync_done` is for garbage collection within the rbtree, and the mutex change in `xt_recent.c` for locking the recent entries is a synchronization update. Now, I'm going to look at these functions and check which are static/exported and which symbols end up in vmlinux. Let's see if those `ip_vs_*` functions I need are visible. I'll check `read-file` or `grepper` or `nm` or similar tools for this.
18/2	2026/11/02 05:57	tool	grepper	0m Args: { "Expression": "(static )?int ip_vs_add_dest", "PathPrefixes": [ "net/netfilter/ipvs/ip_vs_ctl.c" ] } Results: { "Output": "no matches" }
19/2	2026/11/02 05:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33504 output: 43 thoughts: 24 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Analyzing the `ip_vs_ctl.c` Codebase Alright, my internal thought process goes like this: I need to understand what's happening with destination addition within the IPVS system, specifically in the user-space control program. My first instinct, given my experience with this codebase, is to immediately reach for the familiar command-line tools. I want to swiftly locate the function responsible for adding new destinations. Thus, I'll `grep` for the function `ip_vs_add_dest` within the source file `ip_vs_ctl.c`. This is the most efficient starting point. It's the kind of direct and targeted approach I always appreciate, as it quickly zeroes in on the relevant code, avoiding time-consuming navigation through the broader source tree. This will give me the entry point and context I need. From there, I can analyze its calls, arguments, and return values. This will give me a solid foundation for further investigations, and potentially pinpoint any issues.
20/2	2026/11/02 05:57	tool	grepper	0m Args: { "Expression": "ip_vs_add_dest", "PathPrefixes": [ "net/netfilter/ipvs/ip_vs_ctl.c" ] } Results: { "Output": "net/netfilter/ipvs/ip_vs_ctl.c=1560=static int\nnet/netfilter/ipvs/ip_vs_ctl.c:1561:ip_vs_add_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\nnet/netfilter/ipvs/ip_vs_ctl.c-1562-{\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3538=do_ip_vs_set_ctl(struct sock sk, int cmd, sockptr_t ptr, unsigned int len)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3667-\tcase IP_VS_SO_SET_ADDDEST:\nnet/netfilter/ipvs/ip_vs_ctl.c:3668:\t\tret = ip_vs_add_dest(svc, \u0026udest);\nnet/netfilter/ipvs/ip_vs_ctl.c-3669-\t\tbreak;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=4751=static int ip_vs_genl_set_cmd(struct sk_buff skb, struct genl_info *info)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4861-\tcase IPVS_CMD_NEW_DEST:\nnet/netfilter/ipvs/ip_vs_ctl.c:4862:\t\tret = ip_vs_add_dest(svc, \u0026udest);\nnet/netfilter/ipvs/ip_vs_ctl.c-4863-\t\tbreak;\n" }
21/2	2026/11/02 05:57	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 34214 output: 36 thoughts: 2130 Thoughts: Analyzing Kernel Symbol Coverage for Syzkaller Fuzzing Okay, so I'm diving into this set of changes, and the first thing that jumps out is the need to understand how the syzkaller symbol coverage filter works. It looks like it leverages the kernel symbol table, specifically the `kallsyms` or ELF symbol table within `vmlinux`. The key here is that static functions in `.c` files do appear in this table unless they're inlined, which is critical. My goal is to target specific code paths for fuzzing. The syzkaller instructions are pretty clear: Avoid ubiquitous functions (memory allocators, trap handlers, etc.) as they dilute fuzzing effort. Instead, I need to focus on code that implements specific logic or entrypoints related to the changes. Now, the instructions also specifically mention inlined static functions in headers (.h files). These don't have their own symbols, since the compiler inserts their code where they're called. So, the strategy is to identify caller functions in the corresponding `.c` files that exercise those inlined helpers. Let me break down these functions. For example, `nf_ct_master_acceptable` is a static inline in `nf_conntrack_helper.h`, but it's called by `nf_ct_expect_alloc` and `ctnetlink_find_get_master`, in `.c` files, so those are my entrypoints if I want to target that logic. Similarly, `nf_dev_xmit_recursion` is also static inline but called by `nf_send_reset`, `nf_send_reset6`, `nf_do_netdev_egress`, and `nft_fwd_netdev_eval` in various `.c` files, which I can use as entrypoints. Now, I'm going through the list of modified functions, and I'm noting the distinction between the static functions in `.c` files (like `ip_vs_add_dest`, `nft_delrule`) and the static inlines in `.h` headers (like the ones I looked at before). This is very important for my syzkaller symbol coverage setup. I pause on `mark_source_chains` because it's static, but I don't see any significant logic change when looking at the diff, it looks more like a minor cleanup. Now, I need to get a picture of what is actually being changed in this patch. There's a bunch of stuff here: recursion protection, RCU handling, expectation depth limiting, a `current->in_nf_duplicate` bugfix, rule reordering, and port 0 checks. This all looks like a collection of bug fixes in netfilter and IPVS. Before I go further, I should check the kernel configuration requirements for each of these features. I'll need `CONFIG_NETFILTER` obviously, and for IPVS, I'll need `CONFIG_IP_VS` as well as the various protocol-specific options like `CONFIG_IP_VS_PROTO_TCP`, `CONFIG_IP_VS_PROTO_UDP` and `CONFIG_IP_VS_PROTO_SCTP`. I should check `net/netfilter/ipvs/Kconfig` to see the dependencies that `IP_VS` itself requires.
22/2	2026/11/02 05:58	tool	grepper	0m Args: { "Expression": "menuconfig IP_VS", "PathPrefixes": [ "net/netfilter/ipvs/Kconfig" ] } Results: { "Output": "net/netfilter/ipvs/Kconfig-4-#\nnet/netfilter/ipvs/Kconfig:5:menuconfig IP_VS\nnet/netfilter/ipvs/Kconfig-6-\ttristate \"IP virtual server support\"\n" }
23/2	2026/11/02 05:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37171 output: 36 thoughts: 21 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Diving into the IPVS Configuration Okay, so the task at hand is to understand the IPVS configuration options. My instinct tells me to start with the `Kconfig` file, specifically around line 5, where the core definitions should be. This is where I'll get a high-level view of the configurable parameters. I'm expecting to see the dependencies, relationships between different features, and default settings laid out here. No need to waste time digging through the code, I can get the overview quickly by just analyzing the configuration options and their associated documentation, if any, in the `Kconfig` file. Let's see what's there...
24/2	2026/11/02 05:58	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/Kconfig", "FirstLine": 1, "LineCount": 40 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# IP Virtual Server configuration\n 4:\t#\n 5:\tmenuconfig IP_VS\n 6:\t\ttristate \"IP virtual server support\"\n 7:\t\tdepends on INET \u0026\u0026 NETFILTER\n 8:\t\tdepends on (NF_CONNTRACK \|\| NF_CONNTRACK=n)\n 9:\t\thelp\n 10:\t\t IP Virtual Server support will let you build a high-performance\n 11:\t\t virtual server based on cluster of two or more real servers. This\n 12:\t\t option must be enabled for at least one of the clustered computers\n 13:\t\t that will take care of intercepting incoming connections to a\n 14:\t\t single IP address and scheduling them to real servers.\n 15:\t\n 16:\t\t Three request dispatching techniques are implemented, they are\n 17:\t\t virtual server via NAT, virtual server via tunneling and virtual\n 18:\t\t server via direct routing. The several scheduling algorithms can\n 19:\t\t be used to choose which server the connection is directed to,\n 20:\t\t thus load balancing can be achieved among the servers. For more\n 21:\t\t information and its administration program, please visit the\n 22:\t\t following URL: \u003chttp://www.linuxvirtualserver.org/\u003e.\n 23:\t\n 24:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 25:\t\t module, choose M here. If unsure, say N.\n 26:\t\n 27:\tif IP_VS\n 28:\t\n 29:\tconfig\tIP_VS_IPV6\n 30:\t\tbool \"IPv6 support for IPVS\"\n 31:\t\tdepends on IPV6 = y \|\| IP_VS = IPV6\n 32:\t\tselect NF_DEFRAG_IPV6\n 33:\t\thelp\n 34:\t\t Add IPv6 support to IPVS.\n 35:\t\n 36:\t\t Say Y if unsure.\n 37:\t\n 38:\tconfig\tIP_VS_DEBUG\n 39:\t\tbool \"IP virtual server debugging\"\n 40:\t\thelp\n" }
25/2	2026/11/02 05:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37944 output: 37 thoughts: 46 Thoughts: Here's my thought process, summarized as you requested: Kconfig Inspection for IPVS Protocols Okay, time to get this sorted. I need to verify which protocols are supported by IPVS directly through its configuration. Let's start by looking into the `net/netfilter/ipvs/Kconfig` file. I'm specifically interested in the definitions for `IP_VS_PROTO_TCP`, `IP_VS_PROTO_UDP`, and `IP_VS_PROTO_SCTP`. I need to confirm their existence and how they're handled within the broader IPVS configuration structure. This will inform my next steps in understanding the overall protocol support and how these constants are used.
26/2	2026/11/02 05:58	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/Kconfig", "FirstLine": 75, "LineCount": 50 } Results: { "Contents": " 75:\t\t IP VS was compiled built-in.\n 76:\t\n 77:\tcomment \"IPVS transport protocol load balancing support\"\n 78:\t\n 79:\tconfig\tIP_VS_PROTO_TCP\n 80:\t\tbool \"TCP load balancing support\"\n 81:\t\thelp\n 82:\t\t This option enables support for load balancing TCP transport\n 83:\t\t protocol. Say Y if unsure.\n 84:\t\n 85:\tconfig\tIP_VS_PROTO_UDP\n 86:\t\tbool \"UDP load balancing support\"\n 87:\t\thelp\n 88:\t\t This option enables support for load balancing UDP transport\n 89:\t\t protocol. Say Y if unsure.\n 90:\t\n 91:\tconfig\tIP_VS_PROTO_AH_ESP\n 92:\t\tdef_bool IP_VS_PROTO_ESP \|\| IP_VS_PROTO_AH\n 93:\t\n 94:\tconfig\tIP_VS_PROTO_ESP\n 95:\t\tbool \"ESP load balancing support\"\n 96:\t\thelp\n 97:\t\t This option enables support for load balancing ESP (Encapsulation\n 98:\t\t Security Payload) transport protocol. Say Y if unsure.\n 99:\t\n 100:\tconfig\tIP_VS_PROTO_AH\n 101:\t\tbool \"AH load balancing support\"\n 102:\t\thelp\n 103:\t\t This option enables support for load balancing AH (Authentication\n 104:\t\t Header) transport protocol. Say Y if unsure.\n 105:\t\n 106:\tconfig IP_VS_PROTO_SCTP\n 107:\t\tbool \"SCTP load balancing support\"\n 108:\t\tselect NET_CRC32C\n 109:\t\thelp\n 110:\t\t This option enables support for load balancing SCTP transport\n 111:\t\t protocol. Say Y if unsure.\n 112:\t\n 113:\tcomment \"IPVS scheduler\"\n 114:\t\n 115:\tconfig\tIP_VS_RR\n 116:\t\ttristate \"round-robin scheduling\"\n 117:\t\thelp\n 118:\t\t The robin-robin scheduling algorithm simply directs network\n 119:\t\t connections to different real servers in a round-robin manner.\n 120:\t\n 121:\t\t If you want to compile it in kernel, say Y. To compile it as a\n 122:\t\t module, choose M here. If unsure, say N.\n 123:\t \n 124:\tconfig\tIP_VS_WRR\n" }
27/2	2026/11/02 05:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 38845 output: 37 thoughts: 44 Thoughts: Here's my take on those thoughts: Checking Netfilter's Connection Tracking Okay, time to dive into the specifics of `NF_CONNTRACK` and `NF_CT_NETLINK`. I need to confirm their configuration, so I'll start by checking the `Kconfig` file within the `net/netfilter` directory. Specifically, I'm looking for the configuration option for `NF_CT_NETLINK`. This should give me the information I need on its enablement status and any dependencies. From there, I can determine how these options play into my current task.
28/2	2026/11/02 05:58	tool	grepper	0m Args: { "Expression": "config NF_CT_NETLINK\\b", "PathPrefixes": [ "net/netfilter/Kconfig" ] } Results: { "Output": "net/netfilter/Kconfig=355=config NF_CONNTRACK_TFTP\n--\nnet/netfilter/Kconfig-365-\nnet/netfilter/Kconfig:366:config NF_CT_NETLINK\nnet/netfilter/Kconfig-367-\ttristate 'Connection tracking netlink interface'\n" }
29/2	2026/11/02 05:58	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39143 output: 35 thoughts: 20 Thoughts: Okay, here's my interpretation of what's going through my mind, delivered as requested: Navigating `net/netfilter/Kconfig` - Line 366 Alright, let's zero in on line 366 within `net/netfilter/Kconfig`. My initial thought is, "Okay, what's the context here?" I need to understand what configuration option or section we're dealing with. Since I'm already deep in the kernel's netfilter configuration, I'm expecting to be dealing with a feature or module related to packet filtering, connection tracking, NAT, or some other aspect of the network stack that's managed by netfilter. I'm hoping it's a relatively self-contained unit so I don't have to trace a rabbit hole of dependencies right now. My knowledge of this codebase is pretty solid, so I have a mental map, but context is key. Let's see what's being defined or enabled at this specific point. What are the dependencies? Is it a module, or integrated into a larger component? It could be anything from a specific netfilter module to a more global configuration option. I'm going to quickly scan the surrounding lines to understand the immediate context and then make a mental note of what seems important so I can quickly connect it to other areas of the codebase.
30/2	2026/11/02 05:59	tool	read-file	0m Args: { "File": "net/netfilter/Kconfig", "FirstLine": 365, "LineCount": 25 } Results: { "Contents": " 365:\t\n 366:\tconfig NF_CT_NETLINK\n 367:\t\ttristate 'Connection tracking netlink interface'\n 368:\t\tselect NETFILTER_NETLINK\n 369:\t\tdefault m if NETFILTER_ADVANCED=n\n 370:\t\thelp\n 371:\t\t This option enables support for a netlink-based userspace interface\n 372:\t\n 373:\tconfig NF_CT_NETLINK_TIMEOUT\n 374:\t\ttristate 'Connection tracking timeout tuning via Netlink'\n 375:\t\tselect NETFILTER_NETLINK\n 376:\t\tdepends on NETFILTER_ADVANCED\n 377:\t\tdepends on NF_CONNTRACK_TIMEOUT\n 378:\t\thelp\n 379:\t\t This option enables support for connection tracking timeout\n 380:\t\t fine-grain tuning. This allows you to attach specific timeout\n 381:\t\t policies to flows, instead of using the global timeout policy.\n 382:\t\n 383:\t\t If unsure, say `N'.\n 384:\t\n 385:\tconfig NF_CT_NETLINK_HELPER\n 386:\t\ttristate 'Connection tracking helpers in user-space via Netlink'\n 387:\t\tselect NETFILTER_NETLINK\n 388:\t\tdepends on NF_CT_NETLINK\n 389:\t\tdepends on NETFILTER_NETLINK_QUEUE\n" }
31/2	2026/11/02 05:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39855 output: 34 thoughts: 31 Thoughts: Here's my take on those thoughts: Checking the Netfilter Queue Configuration Okay, time to dive into this `NETFILTER_NETLINK_QUEUE` business. I need to understand its current state and any relevant configuration options. The most likely place to start would be the kernel configuration file, and specifically, the `net/netfilter/Kconfig` file. I'm going to scan through that, probably around line 54, to see how this feature is defined and what dependencies or default settings it might have. This should give me a good initial understanding of how it’s enabled and controlled.
32/2	2026/11/02 05:59	tool	read-file	0m Args: { "File": "net/netfilter/Kconfig", "FirstLine": 52, "LineCount": 20 } Results: { "Contents": " 52:\t\t for extended accounting via NFNETLINK.\n 53:\t\n 54:\tconfig NETFILTER_NETLINK_QUEUE\n 55:\t\ttristate \"Netfilter NFQUEUE over NFNETLINK interface\"\n 56:\t\tdepends on NETFILTER_ADVANCED\n 57:\t\tselect NETFILTER_NETLINK\n 58:\t\thelp\n 59:\t\t If this option is enabled, the kernel will include support\n 60:\t\t for queueing packets via NFNETLINK.\n 61:\t\n 62:\tconfig NETFILTER_NETLINK_LOG\n 63:\t\ttristate \"Netfilter LOG over NFNETLINK interface\"\n 64:\t\tdefault m if NETFILTER_ADVANCED=n\n 65:\t\tselect NETFILTER_NETLINK\n 66:\t\thelp\n 67:\t\t If this option is enabled, the kernel will include support\n 68:\t\t for logging packets via NFNETLINK.\n 69:\t\n 70:\t\t This obsoletes the existing ipt_ULOG and ebg_ulog mechanisms,\n 71:\t\t and is also scheduled to replace the old syslog-based ipt_LOG\n" }
33/2	2026/11/02 05:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40341 output: 37 thoughts: 42 Thoughts: Okay, let's dive into this. Here's my thought process on this, as if I'm walking through it: Examining IPv4 and IPv6 Netfilter Rejection Rules Alright, time to focus on `NF_REJECT_IPV4` and `NF_REJECT_IPV6`. I need to understand how these modules are configured, so I'm going to look them up. The Kconfig files are the place to be for kernel configuration options, so let's start with `net/ipv4/netfilter/Kconfig`. I'll explore how they are set up. I expect the relevant options and any dependencies will be clearly documented there. I'll need to see how the rejection behavior is controlled and what other options might influence it.
34/2	2026/11/02 05:59	tool	read-file	0m Args: { "File": "net/ipv4/netfilter/Kconfig", "FirstLine": 94, "LineCount": 20 } Results: { "Contents": " 94:\t\n 95:\tconfig NF_REJECT_IPV4\n 96:\t\ttristate \"IPv4 packet rejection\"\n 97:\t\tdefault m if NETFILTER_ADVANCED=n\n 98:\t\n 99:\tif NF_NAT\n 100:\tconfig NF_NAT_SNMP_BASIC\n 101:\t\ttristate \"Basic SNMP-ALG support\"\n 102:\t\tdepends on NF_CONNTRACK_SNMP\n 103:\t\tdepends on NETFILTER_ADVANCED\n 104:\t\tdefault NF_NAT \u0026\u0026 NF_CONNTRACK_SNMP\n 105:\t\tselect ASN1\n 106:\t\thelp\n 107:\t\n 108:\t\t This module implements an Application Layer Gateway (ALG) for\n 109:\t\t SNMP payloads. In conjunction with NAT, it allows a network\n 110:\t\t management system to access multiple private networks with\n 111:\t\t conflicting addresses. It works by modifying IP addresses\n 112:\t\t inside SNMP payloads to match IP-layer NAT mapping.\n 113:\t\n" }
35/2	2026/11/02 05:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40874 output: 37 thoughts: 17 Thoughts: Here's a summary of my thought process, as requested: Navigating the IPv6 Netfilter Configuration Okay, so I need to understand something related to IPv6 and netfilter, so I'm diving straight into the configuration file. My first instinct, given the context, is to check `net/ipv6/netfilter/Kconfig`. This is the logical starting point. I expect to find the relevant Kconfig file where I can configure the Netfilter options for IPv6. I'm hoping it's well-structured and easy to parse to understand the available features, their dependencies, and any other relevant configurations. Knowing the `Kconfig` file will provide the foundation for understanding how this feature is enabled, disabled, or tuned within the larger system. Time to dig in and see what's there.
36/2	2026/11/02 05:59	tool	read-file	0m Args: { "File": "net/ipv6/netfilter/Kconfig", "FirstLine": 67, "LineCount": 20 } Results: { "Contents": " 67:\t\n 68:\tconfig NF_REJECT_IPV6\n 69:\t\ttristate \"IPv6 packet rejection\"\n 70:\t\tdefault m if NETFILTER_ADVANCED=n\n 71:\t\n 72:\tconfig NF_LOG_IPV6\n 73:\t\ttristate \"IPv6 packet logging\"\n 74:\t\tdefault m if NETFILTER_ADVANCED=n\n 75:\t\tselect NF_LOG_SYSLOG\n 76:\t\thelp\n 77:\t\t This is a backwards-compat option for the user's convenience\n 78:\t\t (e.g. when running oldconfig). It selects CONFIG_NF_LOG_SYSLOG.\n 79:\t\n 80:\tconfig IP6_NF_IPTABLES\n 81:\t\ttristate \"IP6 tables support (required for filtering)\"\n 82:\t\tdepends on INET \u0026\u0026 IPV6\n 83:\t\tselect NETFILTER_XTABLES\n 84:\t\tdefault m if NETFILTER_ADVANCED=n\n 85:\t\thelp\n 86:\t\t ip6tables is a general, extensible packet identification framework.\n" }
37/2	2026/11/02 05:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 41392 output: 35 thoughts: 74 Thoughts: Okay, here's my interpretation of these thoughts, formatted as you requested: Investigating the Usage of `NF_REJECT_IPV4` in Netfilter Right, so I'm trying to get a handle on how `NF_REJECT_IPV4` is actually used within the Netfilter framework. My initial question is pretty straightforward: who's using this thing? I know it's there, but I need to understand its relationship to the higher-level targets. My mind immediately jumps to a few possibilities, like, is it tied to the `IP_NF_TARGET_REJECT` structure, or maybe something in the `nftables` realm? Specifically, are we talking about `NFT_REJECT_IPV4`, `NFT_REJECT_INET`, or the more general `NFT_REJECT`? I need to clarify the relationship here. To figure out this puzzle, my next step is clear. I need to dive into the `net/netfilter/Kconfig` file. That's the place where these sorts of options and dependencies are defined. I'm hoping I can trace how `NF_REJECT_IPV4` is hooked up to other config options, especially those related to the `nftables` infrastructure. The goal here is to get a solid grasp of how it fits into the broader picture of Netfilter. I'm assuming that it will be a prerequisite for a certain feature.
38/2	2026/11/02 05:59	tool	read-file	0m Args: { "File": "net/netfilter/Kconfig", "FirstLine": 454, "LineCount": 25 } Results: { "Contents": " 454:\t\n 455:\tconfig NF_TABLES\n 456:\t\tselect NETFILTER_NETLINK\n 457:\t\tselect NET_CRC32C\n 458:\t\ttristate \"Netfilter nf_tables support\"\n 459:\t\thelp\n 460:\t\t nftables is the new packet classification framework that intends to\n 461:\t\t replace the existing {ip,ip6,arp,eb}_tables infrastructure. It\n 462:\t\t provides a pseudo-state machine with an extensible instruction-set\n 463:\t\t (also known as expressions) that the userspace 'nft' utility\n 464:\t\t (https://www.netfilter.org/projects/nftables) uses to build the\n 465:\t\t rule-set. It also comes with the generic set infrastructure that\n 466:\t\t allows you to construct mappings between matchings and actions\n 467:\t\t for performance lookups.\n 468:\t\n 469:\t\t To compile it as a module, choose M here.\n 470:\t\n 471:\tif NF_TABLES\n 472:\tconfig NF_TABLES_INET\n 473:\t\tdepends on IPV6\n 474:\t\tselect NF_TABLES_IPV4\n 475:\t\tselect NF_TABLES_IPV6\n 476:\t\tbool \"Netfilter nf_tables mixed IPv4/IPv6 tables support\"\n 477:\t\thelp\n 478:\t\t This option enables support for a mixed IPv4/IPv6 \"inet\" table.\n" }
39/2	2026/11/02 05:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42210 output: 44 thoughts: 22 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: Quick Network Inspection Right, let's just do a quick scan. My immediate thought is to check the configuration and usage of `NFT_FWD_NETDEV` and `NF_DUP_NETDEV`. I need to understand how these modules are interacting within the current environment. They are related, and I'm guessing there's a specific reason, or set of reasons, they are being considered together. I'm looking for potential conflicts, performance bottlenecks, or maybe even unintended consequences within the overall netfilter setup. I'm already formulating questions about the specific netfilter chains they're hooked into and how the packets are being handled before and after they're touched.
40/2	2026/11/02 05:59	tool	grepper	0m Args: { "Expression": "config NF(T_FWD\|T_DUP\|_DUP)_NETDEV", "PathPrefixes": [ "net/netfilter/Kconfig" ] } Results: { "Output": "net/netfilter/Kconfig=660=if NF_TABLES_NETDEV\nnet/netfilter/Kconfig-661-\nnet/netfilter/Kconfig:662:config NF_DUP_NETDEV\nnet/netfilter/Kconfig-663-\ttristate \"Netfilter packet duplication support\"\n--\nnet/netfilter/Kconfig-667-\nnet/netfilter/Kconfig:668:config NFT_DUP_NETDEV\nnet/netfilter/Kconfig-669-\ttristate \"Netfilter nf_tables netdev packet duplication support\"\n--\nnet/netfilter/Kconfig-673-\nnet/netfilter/Kconfig:674:config NFT_FWD_NETDEV\nnet/netfilter/Kconfig-675-\ttristate \"Netfilter nf_tables netdev packet forwarding support\"\n" }
41/2	2026/11/02 05:59	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42662 output: 43 thoughts: 26 Thoughts: Here's a summary of my thought process, focusing on those kernel modules, aimed at a fellow expert: Investigating Netfilter Extensions Okay, time to dig into a couple of key Netfilter extensions, specifically `NETFILTER_XT_MATCH_RECENT` and `NETFILTER_XT_TARGET_NETMAP`. Let's see what's what. I need to refresh my understanding of how `recent` works as a match. It's essentially stateful, right? Tracks source IPs or connections over a period. I need to quickly recall the implications for connection tracking and potential race conditions. Is it efficient? What's the overhead like compared to more standard connection tracking? More importantly, is it actually still useful, considering other tools and techniques that have emerged? Then, `NETFILTER_XT_TARGET_NETMAP`. This is the target that uses the netmap data path, right? Now, that's where things get interesting. I need to think through the interaction between the firewall rules and the fast-path netmap processing. What are the limits? Latency? How is it implemented? Does this actually provide any real-world benefit over something like `iptables` with some optimized kernel parameters? I'm wondering if there are any gotchas with fragmentation, or if it might present problems if a particular application bypasses the Netfilter stack. Need to check the documentation on those interactions. Gotta remember to look at the differences between the userspace and kernel components... specifically how the data is handled. Need to think through the details of the driver itself and the potential conflicts if I am using other offload options. Finally, I'll need to revisit the implications for scalability. Can this effectively scale out to larger systems? Is there any documentation on benchmarks? And what about resource contention? Need to map out how it fits into the broader networking stack. I need to be sure I am aware of potential security implications, and how this relates to any hardware offload.
42/2	2026/11/02 06:00	tool	grepper	0m Args: { "Expression": "config NETFILTER_XT_(MATCH_RECENT\|TARGET_NETMAP)", "PathPrefixes": [ "net/netfilter/Kconfig" ] } Results: { "Output": "net/netfilter/Kconfig=974=config NETFILTER_XT_NAT\n--\nnet/netfilter/Kconfig-981-\nnet/netfilter/Kconfig:982:config NETFILTER_XT_TARGET_NETMAP\nnet/netfilter/Kconfig-983-\ttristate '\"NETMAP\" target support'\n--\nnet/netfilter/Kconfig=1527=config NETFILTER_XT_MATCH_REALM\n--\nnet/netfilter/Kconfig-1540-\nnet/netfilter/Kconfig:1541:config NETFILTER_XT_MATCH_RECENT\nnet/netfilter/Kconfig-1542-\ttristate '\"recent\" match support'\n" }
43/2	2026/11/02 06:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 43324 output: 39 thoughts: 20 Thoughts: Here's my take on the thought process, as requested: Diving into Network Functionality: Flow Tables and Connection Tracking Okay, so I need to get a handle on the current state of the networking configuration. My first port of call will be to examine `NF_FLOW_TABLE` and `NF_CONNTRACK_BRIDGE`. These are key modules to understand how network traffic is being handled, especially in complex bridged environments. I'm going to want to understand their current configurations and interactions. Are they enabled? What are the specific parameters that have been set? I need to figure out the exact roles of these components, what they do, what data they are managing and how they work together, in the overall data path of the network packets.
44/2	2026/11/02 06:00	tool	grepper	0m Args: { "Expression": "config (NF_FLOW_TABLE\|NF_CONNTRACK_BRIDGE)\\b", "PathPrefixes": [ "net/" ] } Results: { "Output": "net/bridge/netfilter/Kconfig=26=endif # NF_TABLES_BRIDGE\nnet/bridge/netfilter/Kconfig-27-\nnet/bridge/netfilter/Kconfig:28:config NF_CONNTRACK_BRIDGE\nnet/bridge/netfilter/Kconfig-29-\ttristate \"IPv4/IPV6 bridge connection tracking support\"\n--\nnet/netfilter/Kconfig=703=config NF_FLOW_TABLE_INET\n--\nnet/netfilter/Kconfig-710-\nnet/netfilter/Kconfig:711:config NF_FLOW_TABLE\nnet/netfilter/Kconfig-712-\ttristate \"Netfilter flow table module\"\n" }
45/2	2026/11/02 06:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 43719 output: 35 thoughts: 13 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience and presented in the first person: Analyzing Network Connection Tracking for SIP Alright, let's dive into this `NF_CONNTRACK_SIP` situation. I need to refresh my understanding and ensure I haven't missed any edge cases in its implementation or interaction with other netfilter modules. I'm thinking about the implications for stateful firewalling, particularly how it handles SIP's use of dynamic ports and the signaling-media separation. We need to confirm how the connection tracking module handles the SIP's initial setup and subsequent RTP/RTCP streams, making sure it correctly associates related connections for NAT traversal, security inspection, and session management. I'll need to consider potential vulnerabilities related to SIP floods or malformed SIP packets that this module is designed to protect against. I want to quickly evaluate the efficiency of the connection tracking implementation and its performance impact under heavy SIP traffic loads. Let's see how it behaves under various NAT configurations and if it handles SIP messages with custom headers properly. It's time to refresh and analyze the specific implementation details again.
46/2	2026/11/02 06:00	tool	grepper	0m Args: { "Expression": "config NF_CONNTRACK_SIP", "PathPrefixes": [ "net/netfilter/Kconfig" ] } Results: { "Output": "net/netfilter/Kconfig=330=config NF_CONNTRACK_SANE\n--\nnet/netfilter/Kconfig-342-\nnet/netfilter/Kconfig:343:config NF_CONNTRACK_SIP\nnet/netfilter/Kconfig-344-\ttristate \"SIP protocol support\"\n" }
47/2	2026/11/02 06:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 44093 output: 37 thoughts: 14 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience, and written in the first person: Diving into NAT Masquerade Alright, time to dig into `NF_NAT_MASQUERADE`. I need to refresh my understanding of its current state and how it's behaving. Let's see what's what. I know the fundamentals, but it's always good to revisit the details.
48/2	2026/11/02 06:00	tool	grepper	0m Args: { "Expression": "config NF_NAT_MASQUERADE", "PathPrefixes": [ "net/netfilter/Kconfig" ] } Results: { "Output": "net/netfilter/Kconfig=441=config NF_NAT_REDIRECT\n--\nnet/netfilter/Kconfig-443-\nnet/netfilter/Kconfig:444:config NF_NAT_MASQUERADE\nnet/netfilter/Kconfig-445-\tbool\n" }
49/2	2026/11/02 06:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 44323 output: 32 thoughts: 16 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: Investigating the Implications of `NF_NAT_MASQUERADE` Right, let's dive into this. The initial prompt is pretty clear: I need to understand what's selecting `NF_NAT_MASQUERADE`. It's not a question of if it's being used, but how and why. My immediate train of thought moves beyond just finding the trigger. I need to figure out the context, the interactions. What components, modules, or configurations are implicitly or explicitly calling upon this netfilter hook? Is it a default setup, something hardcoded, a specific firewall rule I've overlooked, a kernel module, or perhaps even something upstream in the distro or an overlay? Beyond the initial call, I need to trace the impact. What's the resulting NAT behavior? Is it as expected, or are there unexpected side effects? Does this introduce any security implications, performance bottlenecks, or conflicts with other routing or network management systems? I'll be looking for configuration files, kernel module parameters, iptables rules, routing tables, and probably even digging through source code if the initial tracing isn't immediately revealing. This is about deep understanding, not just a surface-level identification. I need to be able to predict, and troubleshoot based on first principles.
50/2	2026/11/02 06:00	tool	grepper	0m Args: { "Expression": "select NF_NAT_MASQUERADE", "PathPrefixes": [ "net/" ] } Results: { "Output": "net/netfilter/Kconfig=532=config NFT_MASQ\n--\nnet/netfilter/Kconfig-534-\tdepends on NF_NAT\nnet/netfilter/Kconfig:535:\tselect NF_NAT_MASQUERADE\nnet/netfilter/Kconfig-536-\ttristate \"Netfilter nf_tables masquerade support\"\n--\nnet/netfilter/Kconfig=1043=config NETFILTER_XT_TARGET_MASQUERADE\n--\nnet/netfilter/Kconfig-1046-\tdefault m if NETFILTER_ADVANCED=n\nnet/netfilter/Kconfig:1047:\tselect NF_NAT_MASQUERADE\nnet/netfilter/Kconfig-1048-\thelp\n" }
51/2	2026/11/02 06:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 44865 output: 49 thoughts: 23 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience: Examining iptables and arptables Modules Alright, let's dive in and confirm that `IP_NF_IPTABLES` and `IP_NF_ARPTABLES` are enabled. I need to make sure these foundational Netfilter modules are loaded and operational. The smooth functioning of my network management and security solutions, particularly those that leverage iptables and arptables for packet filtering and manipulation, critically depend on their availability. This check is a fundamental step, allowing me to proceed confidently, knowing that the core tools are accessible. I'll probably be able to use `lsmod` or maybe check `/proc/modules` to verify their presence. If they're not loaded, that's a whole different troubleshooting path, and I'll need to look at why that is.
52/2	2026/11/02 06:00	tool	grepper	0m Args: { "Expression": "config (IP_NF_IPTABLES\|IP_NF_ARPTABLES)\\b", "PathPrefixes": [ "net/ipv4/netfilter/Kconfig" ] } Results: { "Output": "net/ipv4/netfilter/Kconfig=128=endif # NF_NAT\nnet/ipv4/netfilter/Kconfig-129-\nnet/ipv4/netfilter/Kconfig:130:config IP_NF_IPTABLES\nnet/ipv4/netfilter/Kconfig-131-\ttristate \"IP tables support (required for filtering/masq/NAT)\"\n--\nnet/ipv4/netfilter/Kconfig=324=endif # IP_NF_IPTABLES\n--\nnet/ipv4/netfilter/Kconfig-326-# ARP tables\nnet/ipv4/netfilter/Kconfig:327:config IP_NF_ARPTABLES\nnet/ipv4/netfilter/Kconfig-328-\ttristate \"Legacy ARPTABLES support\"\n" }
53/2	2026/11/02 06:00	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 45326 output: 37 thoughts: 1227 Thoughts: Analyzing Focus Symbols in This Patch Okay, let's break this down systematically. I'm looking at this patch and immediately, I see several key areas of modification, each warranting a closer look. My initial thoughts are to focus on symbols that are both representative of the code changes and are likely to be directly targetable symbols in the vmlinux image. First, the IPVS area jumps out: I'm seeing changes around destination management (`ip_vs_rs_hash`, related functions like `__ip_vs_update_dest`, `ip_vs_add_dest`, `ip_vs_del_dest`, `ip_vs_del_service`, `ip_vs_flush`, and `ip_vs_trash_get_dest`), connection scheduling (`ip_vs_new_conn_out`, `tcp_conn_schedule`, `udp_conn_schedule`, `sctp_conn_schedule`), and deregistration (`unregister_ip_vs_app`). We'll need to double-check that this isn't just a re-arrangement of internals. Next, the Netfilter interactions: There's a good chunk of activity here, dealing with packet rejection/recursion (`nf_send_reset`, `nf_send_reset6`), expectation chain limits and master checks (`nf_ct_expect_alloc`, `ctnetlink_find_get_master`, `ctnetlink_create_conntrack`, `ctnetlink_create_expect`), the queue duplicate guard (`nf_reinject`, `__nf_queue`), and the SIP helper (`ct_sip_parse_transport`). We should probably focus on `nf_reinject` due to its position as a "guard". I'm also seeing work on Netfilter tables, offload, and sets, specifically around rule deletion (`nft_delrule`), flow rule destruction (`nft_flow_rule_destroy`), and garbage collection in the rbtree implementation (`nft_rbtree_gc_queue`). Bridge conntrack changes, through `nf_ct_bridge_refrag`, and changes in xt_recent (`recent_proc_net_exit`) also need some scrutiny. There is also a Flow table timeout change through `nf_flow_table_extend_ct_timeout`. Finally, masquerade and Netmap adjustments involving `nf_nat_masquerade_ipv4`, `nf_nat_masquerade_ipv6`, `netmap_tg4`, and `netmap_tg6` are present. Now, I'm going to determine which of these symbols are the best candidates for deeper analysis. The key here is visibility in vmlinux. I'll quickly check if they're exported symbols or potentially inlined. Looking at this quickly, I see: * `nf_send_reset`, `nf_send_reset6`, `ip_vs_new_conn_out`, `tcp_conn_schedule`, `udp_conn_schedule`, `sctp_conn_schedule`, `nf_ct_expect_alloc`, `nft_flow_rule_destroy`, `nf_nat_masquerade_ipv4` and `nf_nat_masquerade_ipv6` seem to be the most obvious candidates as non-static functions. * The rest are static functions, which we'll have to investigate further to see if they're reachable via other exported symbols. Given that `nf_reinject` is a static function, I should now confirm its visibility through callers in `nfnetlink_queue.c`. I have to look into the implementation to confirm its actual role in the system.
54/2	2026/11/02 06:01	tool	grepper	0m Args: { "Expression": "nf_reinject", "PathPrefixes": [ "net/netfilter/nfnetlink_queue.c" ] } Results: { "Output": "net/netfilter/nfnetlink_queue.c=348=static int nf_reroute(struct sk_buff skb, struct nf_queue_entry entry)\n--\nnet/netfilter/nfnetlink_queue.c-363-/* caller must hold rcu read-side lock /\nnet/netfilter/nfnetlink_queue.c:364:static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict)\nnet/netfilter/nfnetlink_queue.c-365-{\n--\nnet/netfilter/nfnetlink_queue.c=496=static void nfqnl_reinject(struct nf_queue_entry *entry, unsigned int verdict)\n--\nnet/netfilter/nfnetlink_queue.c-543-\nnet/netfilter/nfnetlink_queue.c:544:\tnf_reinject(entry, verdict);\nnet/netfilter/nfnetlink_queue.c-545-}\n" }
55/2	2026/11/02 06:01	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 47621 output: 35 thoughts: 209 Thoughts: Analyzing Netfilter Conntrack and Netlink Interaction Okay, so I'm digging into how Netfilter and Netlink are interacting here. My primary focus right now is understanding the flow, and I've zeroed in on `nf_reinject` in `nfnetlink_queue.c`. I need to ensure I understand how this function fits into the bigger picture. Wait, before I get too far down that rabbit hole, let's back up a little and compare `ctnetlink_find_get_master` with `ctnetlink_create_conntrack` and `ctnetlink_create_expect`. I need to be absolutely sure how these functions relate to each other, and especially if `ctnetlink_find_get_master` is inlined. If it's declared `static struct nf_conn ctnetlink_find_get_master(...)` without the `inline` keyword, the compiler might* inline it, but it might not. This could impact how control is passed. On the other hand, I know `ctnetlink_create_conntrack` and `ctnetlink_create_expect` are core functions in `nf_conntrack_netlink.c`, so they're definitely significant. And while I'm at it, I can also look at `nf_ct_expect_alloc`. I see that it's exported via `EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);`, which means it definitely has a symbol. That tells me it's callable outside of its module. The most immediate next step is to examine the callers of `nf_ct_expect_alloc`, which should give me a better understanding of its role in the ecosystem.
56/2	2026/11/02 06:02	tool	grepper	0m Args: { "Expression": "nf_ct_expect_alloc\\b", "PathPrefixes": [ "net/netfilter/" ] } Results: { "Output": "net/netfilter/ipvs/ip_vs_nfct.c=210=void ip_vs_nfct_expect_related(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/ipvs/ip_vs_nfct.c-218-\nnet/netfilter/ipvs/ip_vs_nfct.c:219:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/ipvs/ip_vs_nfct.c-220-\tif (!exp)\n--\nnet/netfilter/nf_conntrack_amanda.c=83=static int amanda_help(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_amanda.c-139-\nnet/netfilter/nf_conntrack_amanda.c:140:\t\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_amanda.c-141-\t\tif (exp == NULL) {\n--\nnet/netfilter/nf_conntrack_broadcast.c=19=int nf_conntrack_broadcast_help(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_broadcast.c-62-\nnet/netfilter/nf_conntrack_broadcast.c:63:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_broadcast.c-64-\tif (exp == NULL)\n--\nnet/netfilter/nf_conntrack_expect.c=300=EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);\n--\nnet/netfilter/nf_conntrack_expect.c-302-/*\nnet/netfilter/nf_conntrack_expect.c:303: nf_ct_expect_alloc - allocate a new conntrack expectation\nnet/netfilter/nf_conntrack_expect.c-304- * @me: The conntrack to be used as master.\n--\nnet/netfilter/nf_conntrack_expect.c-310- /\nnet/netfilter/nf_conntrack_expect.c:311:struct nf_conntrack_expect nf_ct_expect_alloc(struct nf_conn me)\nnet/netfilter/nf_conntrack_expect.c-312-{\n--\nnet/netfilter/nf_conntrack_expect.c-326-}\nnet/netfilter/nf_conntrack_expect.c:327:EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);\nnet/netfilter/nf_conntrack_expect.c-328-\n--\nnet/netfilter/nf_conntrack_ftp.c=361=static int help(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_ftp.c-468-\nnet/netfilter/nf_conntrack_ftp.c:469:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_ftp.c-470-\tif (exp == NULL) {\n--\nnet/netfilter/nf_conntrack_h323_main.c=209=static int expect_rtp_rtcp(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_h323_main.c-234-\t/* Create expect for RTP /\nnet/netfilter/nf_conntrack_h323_main.c:235:\tif ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-236-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c-242-\t/ Create expect for RTCP /\nnet/netfilter/nf_conntrack_h323_main.c:243:\tif ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {\nnet/netfilter/nf_conntrack_h323_main.c-244-\t\tnf_ct_expect_put(rtp_exp);\n--\nnet/netfilter/nf_conntrack_h323_main.c=283=static int expect_t120(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_h323_main.c-303-\t/* Create expect for T.120 connections /\nnet/netfilter/nf_conntrack_h323_main.c:304:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-305-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c=618=static int expect_h245(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_h323_main.c-636-\t/ Create expect for h245 connection /\nnet/netfilter/nf_conntrack_h323_main.c:637:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-638-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c=735=static int expect_callforwarding(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_h323_main.c-764-\t/* Create expect for the second call leg /\nnet/netfilter/nf_conntrack_h323_main.c:765:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-766-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c=1183=static int expect_q931(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_h323_main.c-1211-\t/ Create expect for Q.931 /\nnet/netfilter/nf_conntrack_h323_main.c:1212:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-1213-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c=1263=static int process_gcf(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_h323_main.c-1288-\t/ Need new expect /\nnet/netfilter/nf_conntrack_h323_main.c:1289:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-1290-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c=1486=static int process_acf(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_h323_main.c-1516-\t/ Need new expect /\nnet/netfilter/nf_conntrack_h323_main.c:1517:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-1518-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_h323_main.c=1553=static int process_lcf(struct sk_buff skb, struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_h323_main.c-1570-\t/ Need new expect for call signal /\nnet/netfilter/nf_conntrack_h323_main.c:1571:\tif ((exp = nf_ct_expect_alloc(ct)) == NULL)\nnet/netfilter/nf_conntrack_h323_main.c-1572-\t\treturn -1;\n--\nnet/netfilter/nf_conntrack_irc.c=97=static int help(struct sk_buff skb, unsigned int protoff,\n--\nnet/netfilter/nf_conntrack_irc.c-217-\nnet/netfilter/nf_conntrack_irc.c:218:\t\t\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_irc.c-219-\t\t\tif (exp == NULL) {\n--\nnet/netfilter/nf_conntrack_netlink.c=3552=ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn ct,\n--\nnet/netfilter/nf_conntrack_netlink.c-3577-\t}\nnet/netfilter/nf_conntrack_netlink.c:3578:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_netlink.c-3579-\tif (!exp)\n--\nnet/netfilter/nf_conntrack_pptp.c=128=static int exp_gre(struct nf_conn ct, __be16 callid, __be16 peer_callid)\n--\nnet/netfilter/nf_conntrack_pptp.c-134-\nnet/netfilter/nf_conntrack_pptp.c:135:\texp_orig = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_pptp.c-136-\tif (exp_orig == NULL)\n--\nnet/netfilter/nf_conntrack_pptp.c-138-\nnet/netfilter/nf_conntrack_pptp.c:139:\texp_reply = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_pptp.c-140-\tif (exp_reply == NULL)\n--\nnet/netfilter/nf_conntrack_sane.c=53=static int help(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_sane.c-142-\nnet/netfilter/nf_conntrack_sane.c:143:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_sane.c-144-\tif (exp == NULL) {\n--\nnet/netfilter/nf_conntrack_sip.c=923=static int set_expected_rtp_rtcp(struct sk_buff skb, unsigned int protoff,\n--\nnet/netfilter/nf_conntrack_sip.c-1042-\nnet/netfilter/nf_conntrack_sip.c:1043:\trtp_exp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_sip.c-1044-\tif (rtp_exp == NULL)\n--\nnet/netfilter/nf_conntrack_sip.c-1048-\nnet/netfilter/nf_conntrack_sip.c:1049:\trtcp_exp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_sip.c-1050-\tif (rtcp_exp == NULL)\n--\nnet/netfilter/nf_conntrack_sip.c=1323=static int process_register_request(struct sk_buff skb, unsigned int protoff,\n--\nnet/netfilter/nf_conntrack_sip.c-1398-\nnet/netfilter/nf_conntrack_sip.c:1399:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_sip.c-1400-\tif (!exp) {\n--\nnet/netfilter/nf_conntrack_tftp.c=32=static int tftp_help(struct sk_buff skb,\n--\nnet/netfilter/nf_conntrack_tftp.c-55-\nnet/netfilter/nf_conntrack_tftp.c:56:\t\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nf_conntrack_tftp.c-57-\t\tif (exp == NULL) {\n--\nnet/netfilter/nft_ct.c=1248=static int ct_expect_help(struct sk_buff *skb, unsigned int protoff,\n--\nnet/netfilter/nft_ct.c-1266-\nnet/netfilter/nft_ct.c:1267:\texp = nf_ct_expect_alloc(ct);\nnet/netfilter/nft_ct.c-1268-\tif (!exp)\n" }
57/2	2026/11/02 06:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 51631 output: 31 thoughts: 849 Thoughts: Analyzing Recent Kernel Changes for Fuzzing Opportunities Okay, so I'm looking at this recent patch set and trying to identify potential areas for fuzzing based on the changes. My focus right now is pinpointing anything that introduces new or modified assertions or runtime checks, especially in reachable code paths. That's where fuzzing can be really effective at finding subtle bugs. First, I've noted that `nf_ct_expect_alloc` is the key function for expectation allocation, now that `nf_ct_master_acceptable` has been moved. I also know `ctnetlink_find_get_master` is called from `ctnetlink_create_conntrack` and `ctnetlink_create_expect`, so I'm making a mental note to check if it's inlined or static; it appears to be static in `nf_conntrack_netlink.c`. I'm expanding my scope beyond that area to include other key spots within the networking stack. I'm taking a quick look at other potentially related code, namely: `ip_vs_add_dest`, `__ip_vs_update_dest`, `ip_vs_del_dest`, `ip_vs_del_service`, `ip_vs_flush`, `ip_vs_new_conn_out`, `tcp_conn_schedule`, `udp_conn_schedule`, `sctp_conn_schedule`, the `nf_send_reset` and `nf_send_reset6` rejection paths, `nf_reinject` and `__nf_queue` for the queueing aspect, `nft_delrule`, `nft_flow_rule_destroy`, `nft_rbtree_gc_queue` within nftables, and finally `recent_proc_net_exit`. Now, the `recent_proc_net_exit` function catches my attention. I see that it's called when a network namespace exits, specifically via the `__net_exit` function. Ah, this is an exit hook, specifically for network namespaces. This is excellent because Syzkaller constantly creates and destroys network namespaces, so this path is likely to be hit frequently during fuzzing. I'm focusing in because I see there's a significant change in `recent_proc_net_exit`: the code now uses a `mutex_lock` instead of `spin_lock_bh`. This change is pretty clear. The commit mentions that `remove_proc_entry()` may sleep, hence the change from `spin_lock_bh` to `mutex_lock`. Classic sleeping in atomic context bug fix! This is very good because this type of issue can be exposed by fuzzers. I'm now expanding my scope to check other areas where this style of bug is likely to be present, particularly those that add assertions. I also notice a new debug assertion in `nf_reinject`, specifically: `DEBUG_NET_WARN_ONCE(current->in_nf_duplicate && !entry->in_nf_duplicate`. This is perfect – a new debug assertion! I’m immediately thinking about Section 1 of the commit's description: "NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED." It's stating that when new runtime checks are added, fuzzing is essential. This is now a priority area to investigate. I also see a new `lockdep_assert_held(&ipvs->service_mutex);` in `ip_vs_trash_get_dest` within `ip_vs_ctl.c`, another important assertion! Finally, I'm going to quickly grep for `DEBUG_NET_WARN_ONCE` to see what configuration flags are needed to enable it. My goal is to maximize the chance of triggering these assertions during fuzzing.
58/2	2026/11/02 06:02	tool	grepper	0m Args: { "Expression": "DEBUG_NET_WARN_ONCE", "PathPrefixes": [ "include/" ] } Results: { "Output": "include/net/net_debug.h=114=do {\t\t\t\t\t\t\t\t\\\n--\ninclude/net/net_debug.h-152-#define DEBUG_NET_WARN_ON_ONCE(cond) ((void)WARN_ON_ONCE(cond))\ninclude/net/net_debug.h:153:#define DEBUG_NET_WARN_ONCE(cond, format...) ((void)WARN_ONCE(cond, format))\ninclude/net/net_debug.h-154-#else\ninclude/net/net_debug.h-155-#define DEBUG_NET_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)\ninclude/net/net_debug.h:156:#define DEBUG_NET_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)\ninclude/net/net_debug.h-157-#endif\n" }
59/2	2026/11/02 06:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 53543 output: 37 thoughts: 28 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Investigating `DEBUG_NET_WARN_ONCE` in `net_debug.h` Alright, let's dive into this. I need to understand the implications of `DEBUG_NET_WARN_ONCE`. My immediate goal is to figure out where and how this macro is being used within the `net_debug.h` header file. I assume it's a conditional debugging mechanism, likely meant to trigger a warning message only once per boot or a similar scoping constraint. I want to see what triggers the warning and what conditions surround it. I'm looking for potential race conditions, subtle logic errors, or areas where verbose warnings could be detrimental to performance, so that I can provide advice on how to fix the issue. I have to see what the macro's parameters are, if any. I'll need to confirm if it's based on a static variable, a kernel object or something else entirely. Basically, I want to understand the design choices behind it and whether those choices are still valid in the current code base. Let's dig in and see what we find.
60/2	2026/11/02 06:02	tool	read-file	0m Args: { "File": "include/net/net_debug.h", "FirstLine": 140, "LineCount": 25 } Results: { "Contents": " 140:\t#define netif_vdbg\tnetif_dbg\n 141:\t#else\n 142:\t#define netif_vdbg(priv, type, dev, format, args...)\t\t\\\n 143:\t({\t\t\t\t\t\t\t\t\\\n 144:\t\tif (0)\t\t\t\t\t\t\t\\\n 145:\t\t\tnetif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \\\n 146:\t\t0;\t\t\t\t\t\t\t\\\n 147:\t})\n 148:\t#endif\n 149:\t\n 150:\t\n 151:\t#if defined(CONFIG_DEBUG_NET)\n 152:\t#define DEBUG_NET_WARN_ON_ONCE(cond) ((void)WARN_ON_ONCE(cond))\n 153:\t#define DEBUG_NET_WARN_ONCE(cond, format...) ((void)WARN_ONCE(cond, format))\n 154:\t#else\n 155:\t#define DEBUG_NET_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)\n 156:\t#define DEBUG_NET_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)\n 157:\t#endif\n 158:\t\n 159:\t#endif\t/* _LINUX_NET_DEBUG_H */\n" }
61/2	2026/11/02 06:02	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 54212 output: 512 thoughts: 2142 Thoughts: Fuzzing Configuration for Networking Assertions Okay, so we're diving into fuzzing some networking assertions, which means the first thing I'm enabling is `CONFIG_DEBUG_NET`. I'll also want to make sure lockdep is set up, so I need to decide if I want `CONFIG_PROVE_LOCKING` or just `CONFIG_LOCKDEP` for `lockdep_assert_held`. Now, let's nail down the necessary configurations. I've got a comprehensive list to ensure proper compilation and reachability of the modified code, based on the Kconfig files: * `NETFILTER` * `IP_VS` * `IP_VS_PROTO_TCP` * `IP_VS_PROTO_UDP` * `IP_VS_PROTO_SCTP` * `NF_CONNTRACK` * `NF_CT_NETLINK` * `NF_CONNTRACK_SIP` * `NF_TABLES` * `NETFILTER_NETLINK_QUEUE` * `NF_REJECT_IPV4` * `NF_REJECT_IPV6` * `NF_FLOW_TABLE` * `NF_CONNTRACK_BRIDGE` * `NETFILTER_XT_MATCH_RECENT` * `NETFILTER_XT_TARGET_NETMAP` * `DEBUG_NET` I have also reviewed the dependencies of these configs: `IP_VS` requires `INET` and `NETFILTER`, `IP_VS_PROTO_SCTP` depends on `IP_VS`, `NF_CONNTRACK` depends on `NETFILTER`, `NF_CT_NETLINK` depends on `NF_CONNTRACK` and `NETFILTER_ADVANCED` (or `default m if NETFILTER_ADVANCED=n`), `NF_TABLES` depends on `NETFILTER`, `NETFILTER_NETLINK_QUEUE` depends on `NETFILTER_ADVANCED`, `NF_CONNTRACK_BRIDGE` depends on `BRIDGE` and `NF_CONNTRACK`, `NF_REJECT_IPV4` depends on `NETFILTER`, `NF_REJECT_IPV6` depends on `NETFILTER` and `IPV6`, `NF_FLOW_TABLE` depends on `NETFILTER` and `NF_CONNTRACK`, and `DEBUG_NET` depends on `DEBUG_KERNEL` and `NET`. Next, I have identified a list of FocusSymbols—specific kernel functions that I think are the most critical to target. These functions directly relate to the changes I'm interested in fuzzing, specifically avoiding generic functions and targeting feature-specific logic. I've confirmed that these are not likely to be inlined. The critical functions from IPVS are: * `ip_vs_add_dest` * `ip_vs_del_dest` * `ip_vs_del_service` * `ip_vs_flush` * `ip_vs_new_conn_out` * `tcp_conn_schedule` * `udp_conn_schedule` * `sctp_conn_schedule` * `unregister_ip_vs_app` From Netfilter and related subsystems: * `nf_ct_expect_alloc` * `ctnetlink_create_conntrack` * `ctnetlink_create_expect` * `ctnetlink_find_get_master` * `ct_sip_parse_transport` * `nf_flow_table_extend_ct_timeout` From Netfilter rejections: * `nf_send_reset` * `nf_send_reset6` From Netfilter queue: * `nf_reinject` * `__nf_queue` From Nftables: * `nft_delrule` * `nft_flow_rule_destroy` * `nft_rbtree_gc_queue` And finally: * `recent_proc_net_exit` I've ensured these symbol names are accurate. Finally, I've confirmed that all conditions for `WorthFuzzing` are met. This code is in core subsystems: netfilter, IPVS, and networking. The code is reachable from userspace, and there are new assertions and control flow logic to test related to concurrency and RCU. Thus, the fuzzing verdict is True.
62/2	2026/11/02 06:02	tool	set-results	0m Args: { "EnableConfigs": [ "NETFILTER", "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_CONNTRACK", "NF_CT_NETLINK", "NF_CONNTRACK_SIP", "NF_TABLES", "NETFILTER_NETLINK_QUEUE", "NF_REJECT_IPV4", "NF_REJECT_IPV6", "NF_FLOW_TABLE", "NF_CONNTRACK_BRIDGE", "NETFILTER_XT_MATCH_RECENT", "NETFILTER_XT_TARGET_NETMAP", "DEBUG_NET" ], "FocusSymbols": [ "nf_send_reset", "nf_send_reset6", "nf_ct_expect_alloc", "ctnetlink_find_get_master", "ctnetlink_create_conntrack", "ctnetlink_create_expect", "nf_reinject", "__nf_queue", "ip_vs_add_dest", "ip_vs_del_dest", "ip_vs_del_service", "ip_vs_flush", "ip_vs_new_conn_out", "tcp_conn_schedule", "udp_conn_schedule", "sctp_conn_schedule", "nft_delrule", "nft_flow_rule_destroy", "nft_rbtree_gc_queue", "ct_sip_parse_transport", "recent_proc_net_exit" ], "Reasoning": "The patch series touches several core Netfilter and IPVS subsystems. It introduces recursion tracking into IPv4 and IPv6 reset packet generation, bounds conntrack expectation chains, adds RCU grace period synchronization and lockdep assertions when rehashing and trashing IPVS destinations, saves and validates packet duplication flags across nfqueue reinjection with DEBUG_NET_WARN_ONCE, fixes locking in xt_recent netns teardown, and handles port 0 validation in IPVS protocol schedulers. All modified paths are reachable via standard networking syscalls, netlink, and network namespaces. Fuzzing is warranted to test new invariants, assertions, and concurrency semantics.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "NETFILTER", "IP_VS", "IP_VS_PROTO_TCP", "IP_VS_PROTO_UDP", "IP_VS_PROTO_SCTP", "NF_CONNTRACK", "NF_CT_NETLINK", "NF_CONNTRACK_SIP", "NF_TABLES", "NETFILTER_NETLINK_QUEUE", "NF_REJECT_IPV4", "NF_REJECT_IPV6", "NF_FLOW_TABLE", "NF_CONNTRACK_BRIDGE", "NETFILTER_XT_MATCH_RECENT", "NETFILTER_XT_TARGET_NETMAP", "DEBUG_NET" ], "FocusSymbols": [ "nf_send_reset", "nf_send_reset6", "nf_ct_expect_alloc", "ctnetlink_find_get_master", "ctnetlink_create_conntrack", "ctnetlink_create_expect", "nf_reinject", "__nf_queue", "ip_vs_add_dest", "ip_vs_del_dest", "ip_vs_del_service", "ip_vs_flush", "ip_vs_new_conn_out", "tcp_conn_schedule", "udp_conn_schedule", "sctp_conn_schedule", "nft_delrule", "nft_flow_rule_destroy", "nft_rbtree_gc_queue", "ct_sip_parse_transport", "recent_proc_net_exit" ], "Reasoning": "The patch series touches several core Netfilter and IPVS subsystems. It introduces recursion tracking into IPv4 and IPv6 reset packet generation, bounds conntrack expectation chains, adds RCU grace period synchronization and lockdep assertions when rehashing and trashing IPVS destinations, saves and validates packet duplication flags across nfqueue reinjection with DEBUG_NET_WARN_ONCE, fixes locking in xt_recent netns teardown, and handles port 0 validation in IPVS protocol schedulers. All modified paths are reachable via standard networking syscalls, netlink, and network namespaces. Fuzzing is warranted to test new invariants, assertions, and concurrency semantics.", "WorthFuzzing": true }
63/1	2026/11/02 06:02	action	If	3m Args: { "WorthFuzzing": true } Results: null
64/2	2026/11/02 06:02	agent	kmsan-evaluator	3m Model: core Args: null Results: { "KMSANReasoning": "The patch series consists of various bug fixes and hardening across Netfilter, IPVS, and related subsystems:\n\n1. Uninitialized Memory Fixes (nf_nat_masquerade.c, xt_NETMAP.c):\nThe changes replace partial memsets of min_addr/max_addr with full `memset(\u0026newrange, 0, sizeof(newrange))`, properly zeroing the entire stack struct (including `base_proto`). These changes remediate existing uninitialized stack variable reads rather than introducing them.\n\n2. Target Verdict Check (arp_tables.c, ip_tables.c, ip6_tables.c):\nIn `mark_source_chains()`, `t-\u003everdict` is now read only after verifying `strcmp(...) == 0` for XT_STANDARD_TARGET, preventing non-standard targets from being interpreted as `xt_standard_target`. The local variable `newpos` is assigned deterministically in both branches of the conditional, ensuring no uninitialized read occurs.\n\n3. IPVS and RCU Handling (ip_vs_.c, include/net/ip_vs.h):\nNew fields `rcu_state` and `need_gp` added to `struct ip_vs_dest` are fully zero-initialized via `kzalloc_obj` at allocation time and are purely internal kernel state. The change from `kfree` to `kfree_rcu` fixes a use-after-free race condition, which falls squarely under KASAN's detection capabilities. Module init/cleanup reordering and port 0 validation address lifecycle and logic issues.\n\n4. Netfilter Queue Entry (nf_queue.c, nfnetlink_queue.c, nf_queue.h):\nThe new `in_nf_duplicate` boolean on `struct nf_queue_entry` is initialized via designated initializer struct literal during allocation and is not exported to userspace.\n\n5. Other Subsystem Changes:\nRecursion limit guards (`nf_dev_xmit_recursion`) protect against stack overflow / infinite loops. Length checking in `nf_conntrack_sip` prevents out-of-bounds reads (covered by KASAN). The NULL check in `nft_rbtree_gc_queue` prevents NULL pointer dereference, and replacing a spinlock with a mutex in `xt_recent` prevents sleeping-while-atomic bugs (covered by LOCKDEP).\n\nNone of the changes introduce risks of uninitialized memory reads, uninitialized branching, or kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and existing kernel assertions are fully equipped to catch any potential regressions. A dedicated KMSAN run is not warranted.", "NeedsKMSAN": false } Instruction:* You are an expert Linux kernel security engineer specializing in kernel memory error detectors (KASAN and KMSAN). Your job is to review the provided patch series and determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer) fuzzing session in addition to standard KASAN fuzzing. CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN: - Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable a comprehensive suite of debugging tools and sanitizers, including KASAN (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks. - KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap, or page allocations) and kernel-to-user memory info-leaks. Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN, LOCKDEP, OR OTHER STANDARD BUG DETECTORS. A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks that are detected ONLY by KMSAN. Look holistically at the patch series and surrounding code. Even if no direct uninitialized field accesses or new buffer allocations are added in the diff itself, a patch may alter control flow, bounds checking, or data length calculations in ways that change how the rest of the code operates on existing buffers (e.g. allowing uninitialized stack/heap memory to be read, copied to user space, or used in control flow). Do not hesitate to use your code access tools to inspect the surrounding code, called functions, and callers. Set NeedsKMSAN=true ONLY IF the patch introduces or modifies: 1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb attributes, ioctl output arguments, socket options, or BPF buffers) where fields or structure padding might not be fully initialized/zeroed. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths. 4. Bounds checks, lengths, or logic in a way that allows surrounding code to access uninitialized bytes of existing buffers. Set NeedsKMSAN=false IF: - The code changes primarily risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (these are already caught by KASAN, LOCKDEP, or standard bug detectors). - All stack/heap structures touched or introduced by the patch are fully zeroed or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied. - The patch does not introduce any risk of uninitialized memory usage or info-leaks. Use your code access tools to inspect the surrounding code if necessary, then provide detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch. Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit d8d758cd343442f0e384a65ddedcc65a14ae3601 Author: syz-cluster <triage@syzkaller.com> Date: Mon Nov 2 05:55:08 2026 +0000 syz-cluster: applied patch under review diff --git a/include/linux/netdevice_xmit.h b/include/linux/netdevice_xmit.h index cc232508e695ee..286ae5a6101e8c 100644 --- a/include/linux/netdevice_xmit.h +++ b/include/linux/netdevice_xmit.h @@ -18,8 +18,8 @@ struct netdev_xmit { u8 sched_mirred_nest; struct net_device sched_mirred_dev[MIRRED_NEST_LIMIT]; #endif -#if IS_ENABLED(CONFIG_NF_DUP_NETDEV) - u8 nf_dup_skb_recursion; +#if IS_ENABLED(CONFIG_NETFILTER) + u8 nf_xmit_skb_recursion; #endif }; diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h index 9a83bff32569da..50a2999beb01fe 100644 --- a/include/net/ip_vs.h +++ b/include/net/ip_vs.h @@ -1021,7 +1021,9 @@ struct ip_vs_dest { struct rcu_head rcu_head; struct list_head t_list; / in dest_trash / - unsigned int in_rs_table:1; / we are in rs_table / + unsigned long rcu_state; / GP cookie when trashed / + unsigned int in_rs_table:1, / we are in rs_table / + need_gp:1; / Need GP on rehash / }; / The scheduler object / diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h index 335b8c43694f8e..617178fd4d8bc3 100644 --- a/include/net/netfilter/nf_conntrack_helper.h +++ b/include/net/netfilter/nf_conntrack_helper.h @@ -29,6 +29,8 @@ enum nf_ct_helper_flags { #define NF_CT_HELPER_NAME_LEN 16 +#define NF_CT_MAX_EXPECT_CHAIN_LEN 2 + / Must be kept in sync with the classes defined by helpers / #define NF_CT_MAX_EXPECT_CLASSES 4 @@ -159,6 +161,19 @@ static inline void nf_ct_help_put(const struct nf_conn ct) kfree_rcu(helper, rcu); } +static inline bool nf_ct_master_acceptable(const struct nf_conn m) +{ + unsigned int depth = 0; + + while (m->master) { + if (++depth >= NF_CT_MAX_EXPECT_CHAIN_LEN) + return false; + m = m->master; + } + + return true; +} + int nf_conntrack_helper_init(void); void nf_conntrack_helper_fini(void); diff --git a/include/net/netfilter/nf_dup_netdev.h b/include/net/netfilter/nf_dup_netdev.h index f6b05bd80c3fe3..a394112646144e 100644 --- a/include/net/netfilter/nf_dup_netdev.h +++ b/include/net/netfilter/nf_dup_netdev.h @@ -9,41 +9,6 @@ void nf_dup_netdev_egress(const struct nft_pktinfo pkt, int oif); void nf_fwd_netdev_egress(const struct nft_pktinfo pkt, int oif); -#define NF_RECURSION_LIMIT 2 - -#ifndef CONFIG_PREEMPT_RT -static inline bool nf_dev_xmit_recursion(void) -{ - return unlikely(__this_cpu_read(softnet_data.xmit.nf_dup_skb_recursion) > - NF_RECURSION_LIMIT); -} - -static inline void nf_dev_xmit_recursion_inc(void) -{ - __this_cpu_inc(softnet_data.xmit.nf_dup_skb_recursion); -} - -static inline void nf_dev_xmit_recursion_dec(void) -{ - __this_cpu_dec(softnet_data.xmit.nf_dup_skb_recursion); -} -#else -static inline bool nf_dev_xmit_recursion(void) -{ - return unlikely(current->net_xmit.nf_dup_skb_recursion > NF_RECURSION_LIMIT); -} - -static inline void nf_dev_xmit_recursion_inc(void) -{ - current->net_xmit.nf_dup_skb_recursion++; -} - -static inline void nf_dev_xmit_recursion_dec(void) -{ - current->net_xmit.nf_dup_skb_recursion--; -} -#endif - struct nft_offload_ctx; struct nft_flow_rule; diff --git a/include/net/netfilter/nf_queue.h b/include/net/netfilter/nf_queue.h index 86021c55ba3ce9..4a8cefd8398d79 100644 --- a/include/net/netfilter/nf_queue.h +++ b/include/net/netfilter/nf_queue.h @@ -23,6 +23,7 @@ struct nf_queue_entry { struct net_device physout; #endif struct nf_hook_state state; + bool in_nf_duplicate; bool nf_ct_is_unconfirmed; u16 size; /* sizeof(entry) + saved route keys / diff --git a/include/net/netfilter/nf_recursion.h b/include/net/netfilter/nf_recursion.h new file mode 100644 index 00000000000000..1ac65f7793f197 --- /dev/null +++ b/include/net/netfilter/nf_recursion.h @@ -0,0 +1,42 @@ +/ SPDX-License-Identifier: GPL-2.0 / +#ifndef _NF_RECURSION_H_ +#define _NF_RECURSION_H_ + +#include <linux/netdevice.h> + +#define NF_RECURSION_LIMIT 2 + +#ifndef CONFIG_PREEMPT_RT +static inline bool nf_dev_xmit_recursion(void) +{ + return unlikely(__this_cpu_read(softnet_data.xmit.nf_xmit_skb_recursion) > + NF_RECURSION_LIMIT); +} + +static inline void nf_dev_xmit_recursion_inc(void) +{ + __this_cpu_inc(softnet_data.xmit.nf_xmit_skb_recursion); +} + +static inline void nf_dev_xmit_recursion_dec(void) +{ + __this_cpu_dec(softnet_data.xmit.nf_xmit_skb_recursion); +} +#else +static inline bool nf_dev_xmit_recursion(void) +{ + return unlikely(current->net_xmit.nf_xmit_skb_recursion > NF_RECURSION_LIMIT); +} + +static inline void nf_dev_xmit_recursion_inc(void) +{ + current->net_xmit.nf_xmit_skb_recursion++; +} + +static inline void nf_dev_xmit_recursion_dec(void) +{ + current->net_xmit.nf_xmit_skb_recursion--; +} +#endif + +#endif / _NF_RECURSION_H_ / diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c index b5444335b86f2b..8c83dc05114ba7 100644 --- a/net/bridge/netfilter/nf_conntrack_bridge.c +++ b/net/bridge/netfilter/nf_conntrack_bridge.c @@ -358,7 +358,7 @@ nf_ct_bridge_refrag(struct sk_buff skb, const struct nf_hook_state state, nf_br_ip6_fragment(state->net, state->sk, skb, &data, output); break; default: - WARN_ON_ONCE(1); + DEBUG_NET_WARN_ON_ONCE(1); return NF_DROP; } diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c index cf747e1e17a363..7ff3d1f0ffd411 100644 --- a/net/ipv4/netfilter/arp_tables.c +++ b/net/ipv4/netfilter/arp_tables.c @@ -371,11 +371,12 @@ static int mark_source_chains(const struct xt_table_info newinfo, e->counters.pcnt = pos; pos += size; } else { - int newpos = t->verdict; + int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && - newpos >= 0) { + t->verdict >= 0) { + newpos = t->verdict; /* This a jump; chase it. / if (!xt_find_jump_offset(offsets, newpos, newinfo->number)) diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index 809441cedcedc7..b302bd77180a75 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -422,11 +422,12 @@ mark_source_chains(const struct xt_table_info newinfo, e->counters.pcnt = pos; pos += size; } else { - int newpos = t->verdict; + int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && - newpos >= 0) { + t->verdict >= 0) { + newpos = t->verdict; /* This a jump; chase it. / if (!xt_find_jump_offset(offsets, newpos, newinfo->number)) diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c index 7cb33af671e260..4082fa184af8ba 100644 --- a/net/ipv4/netfilter/nf_reject_ipv4.c +++ b/net/ipv4/netfilter/nf_reject_ipv4.c @@ -10,6 +10,7 @@ #include <net/dst.h> #include <net/dst_metadata.h> #include <net/netfilter/ipv4/nf_reject.h> +#include <net/netfilter/nf_recursion.h> #include <linux/netfilter_ipv4.h> #include <linux/netfilter_bridge.h> @@ -336,7 +337,18 @@ void nf_send_reset(struct net net, struct sock sk, struct sk_buff oldskb, dev_queue_xmit(nskb); } else #endif + { + local_bh_disable(); + if (nf_dev_xmit_recursion()) { + local_bh_enable(); + goto free_nskb; + } + + nf_dev_xmit_recursion_inc(); ip_local_out(net, nskb->sk, nskb); + nf_dev_xmit_recursion_dec(); + local_bh_enable(); + } return; diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index 313c4aac377aa2..010baaa6066573 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -440,11 +440,12 @@ mark_source_chains(const struct xt_table_info newinfo, e->counters.pcnt = pos; pos += size; } else { - int newpos = t->verdict; + int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && - newpos >= 0) { + t->verdict >= 0) { + newpos = t->verdict; / This a jump; chase it. / if (!xt_find_jump_offset(offsets, newpos, newinfo->number)) diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c index 5e08d8529cc889..7c94641845175c 100644 --- a/net/ipv6/netfilter/nf_reject_ipv6.c +++ b/net/ipv6/netfilter/nf_reject_ipv6.c @@ -10,6 +10,7 @@ #include <net/ip6_checksum.h> #include <net/dst_metadata.h> #include <net/netfilter/ipv6/nf_reject.h> +#include <net/netfilter/nf_recursion.h> #include <linux/netfilter_ipv6.h> #include <linux/netfilter_bridge.h> @@ -409,7 +410,19 @@ void nf_send_reset6(struct net net, struct sock sk, struct sk_buff oldskb, dev_queue_xmit(nskb); } else #endif + { + local_bh_disable(); + if (nf_dev_xmit_recursion()) { + local_bh_enable(); + kfree_skb(nskb); + return; + } + + nf_dev_xmit_recursion_inc(); ip6_local_out(net, sk, nskb); + nf_dev_xmit_recursion_dec(); + local_bh_enable(); + } } EXPORT_SYMBOL_GPL(nf_send_reset6); diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c index 11cbdbaf561daf..2c1b47702da213 100644 --- a/net/netfilter/ipvs/ip_vs_app.c +++ b/net/netfilter/ipvs/ip_vs_app.c @@ -242,7 +242,7 @@ void unregister_ip_vs_app(struct netns_ipvs ipvs, struct ip_vs_app app) } list_del(&a->a_list); - kfree(a); + kfree_rcu(a, rcu_head); /* decrease the module use count / ip_vs_use_count_dec(); diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c index fd503f0efb5783..f3eb72e95024dd 100644 --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -1305,6 +1305,7 @@ static inline bool is_new_conn_expected(const struct ip_vs_conn cp, * In fwmark-VS actual vaddr and vport are unknown to IPVS * 2) Real Server and Virtual Service were NOT configured without port: * This is to allow match of different VS to the same RS ip-addr + * 3) Client port is not 0 / struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc, struct ip_vs_dest dest, @@ -1328,7 +1329,7 @@ struct ip_vs_conn ip_vs_new_conn_out(struct ip_vs_service svc, /* check pre-requisites are satisfied / if (svc->fwmark) return NULL; - if (!vport \|\| !dport) + if (!vport \|\| !dport \|\| !cport) return NULL; / for persistent service first create connection template / @@ -2502,12 +2503,12 @@ static int __net_init __ip_vs_init(struct net net) if (ip_vs_estimator_net_init(ipvs) < 0) goto estimator_fail; - if (ip_vs_control_net_init(ipvs) < 0) - goto control_fail; - if (ip_vs_protocol_net_init(ipvs) < 0) goto protocol_fail; + if (ip_vs_control_net_init(ipvs) < 0) + goto control_fail; + if (ip_vs_app_net_init(ipvs) < 0) goto app_fail; @@ -2527,10 +2528,10 @@ static int __net_init __ip_vs_init(struct net net) conn_fail: ip_vs_app_net_cleanup(ipvs); app_fail: - ip_vs_protocol_net_cleanup(ipvs); -protocol_fail: ip_vs_control_net_cleanup(ipvs); control_fail: + ip_vs_protocol_net_cleanup(ipvs); +protocol_fail: ip_vs_estimator_net_cleanup(ipvs); estimator_fail: net->ipvs = NULL; @@ -2547,8 +2548,8 @@ static void __net_exit __ip_vs_cleanup_batch(struct list_head net_list) ipvs = net_ipvs(net); ip_vs_conn_net_cleanup(ipvs); ip_vs_app_net_cleanup(ipvs); - ip_vs_protocol_net_cleanup(ipvs); ip_vs_control_net_cleanup(ipvs); + ip_vs_protocol_net_cleanup(ipvs); ip_vs_estimator_net_cleanup(ipvs); IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen); net->ipvs = NULL; diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index ce9fe20d6106a8..7f10cf5b48c7f3 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -64,7 +64,8 @@ int ip_vs_get_debug_level(void) /* Protos / -static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup); +static void __ip_vs_del_service(struct ip_vs_service svc, + struct list_head dest_trash, bool cleanup); #ifdef CONFIG_IP_VS_IPV6 @@ -918,6 +919,11 @@ static void ip_vs_rs_hash(struct netns_ipvs ipvs, struct ip_vs_dest dest) / hash = ip_vs_rs_hashkey(dest->af, &dest->addr, port); + / Need RCU grace period when rehashing / + if (dest->need_gp) { + cond_synchronize_rcu(dest->rcu_state); + dest->need_gp = 0; + } hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]); dest->in_rs_table = 1; } @@ -1111,6 +1117,8 @@ ip_vs_trash_get_dest(struct ip_vs_service svc, int dest_af, struct ip_vs_dest dest; struct netns_ipvs ipvs = svc->ipvs; + lockdep_assert_held(&ipvs->service_mutex); + /* * Find the destination in trash / @@ -1144,24 +1152,57 @@ ip_vs_trash_get_dest(struct ip_vs_service svc, int dest_af, return dest; } -/* Put destination in trash / -static void ip_vs_trash_put_dest(struct netns_ipvs ipvs, +/* Add destination in temp list for trash / +static void ip_vs_trash_add_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest, unsigned long istart, - bool cleanup) + struct list_head dest_trash) { - spin_lock_bh(&ipvs->dest_trash_lock); IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n", IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port), refcount_read(&dest->refcnt)); + /* dest lives in trash with reference / + list_add(&dest->t_list, dest_trash); + dest->idle_start = istart; +} + +/ Put destinations in trash / +static void ip_vs_trash_put_dests(struct netns_ipvs ipvs, + struct list_head dest_trash, bool cleanup) +{ + spin_lock_bh(&ipvs->dest_trash_lock); if (list_empty(&ipvs->dest_trash) && !cleanup) mod_timer(&ipvs->dest_trash_timer, jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1)); - / dest lives in trash with reference / - list_add(&dest->t_list, &ipvs->dest_trash); - dest->idle_start = istart; + list_splice(dest_trash, &ipvs->dest_trash); spin_unlock_bh(&ipvs->dest_trash_lock); } +/ Put destination back in trash / +static void ip_vs_trash_put_back(struct netns_ipvs ipvs, + struct ip_vs_dest dest) +{ + LIST_HEAD(dest_trash); + + ip_vs_trash_add_dest(ipvs, dest, dest->idle_start, &dest_trash); + ip_vs_trash_put_dests(ipvs, &dest_trash, false); +} + +/ Put destinations in trash and save the RCU state / +static void ip_vs_trash_save_dests(struct netns_ipvs ipvs, + struct list_head dest_trash, bool cleanup) +{ + struct ip_vs_dest dest; + unsigned long rcu_state; + + if (!list_empty(dest_trash)) { + /* Remember when dests were removed and added to dest_trash / + rcu_state = get_state_synchronize_rcu(); + list_for_each_entry(dest, dest_trash, t_list) + dest->rcu_state = rcu_state; + ip_vs_trash_put_dests(ipvs, dest_trash, cleanup); + } +} + static void ip_vs_dest_rcu_free(struct rcu_head head) { struct ip_vs_dest dest; @@ -1369,8 +1410,16 @@ __ip_vs_update_dest(struct ip_vs_service svc, struct ip_vs_dest dest, if ((udest->conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_DFWD_METHOD(dest) \|\| udest->tun_type != dest->tun_type \|\| - udest->tun_port != dest->tun_port) + udest->tun_port != dest->tun_port) { + bool unlinked = dest->in_rs_table; + ip_vs_rs_unhash(dest); + if (unlinked) { + dest->rcu_state = get_state_synchronize_rcu(); + / Need grace period in this or next dest update / + dest->need_gp = 1; + } + } / set the tunnel info / dest->tun_type = udest->tun_type; @@ -1566,11 +1615,18 @@ ip_vs_add_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) ret = ip_vs_start_estimator(svc->ipvs, &dest->stats); / On error put back dest into the trash / - if (ret < 0) - ip_vs_trash_put_dest(svc->ipvs, dest, dest->idle_start, - false); - else + if (ret < 0) { + ip_vs_trash_put_back(svc->ipvs, dest); + } else { + / Readers may still follow the n_list/d_list of the + * unlinked dest, wait before linking it again. + / + cond_synchronize_rcu(dest->rcu_state); + / need_gp matters only on dest edit, reinit it / + dest->need_gp = 0; + __ip_vs_update_dest(svc, dest, udest, 1); + } } else { / * Allocate and initialize the dest structure @@ -1634,7 +1690,7 @@ ip_vs_edit_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) * Delete a destination (must be already unlinked from the service) / static void __ip_vs_del_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest, - bool cleanup) + struct list_head dest_trash, bool cleanup) { ip_vs_stop_estimator(ipvs, &dest->stats); @@ -1643,7 +1699,7 @@ static void __ip_vs_del_dest(struct netns_ipvs ipvs, struct ip_vs_dest dest, / ip_vs_rs_unhash(dest); - ip_vs_trash_put_dest(ipvs, dest, 0, cleanup); + ip_vs_trash_add_dest(ipvs, dest, 0, dest_trash); / Queue up delayed work to expire all no destination connections. * No-op when CONFIG_SYSCTL is disabled. @@ -1693,6 +1749,7 @@ ip_vs_del_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) { struct ip_vs_dest dest; __be16 dport = udest->port; + LIST_HEAD(dest_trash); / We use function that requires RCU lock / rcu_read_lock(); @@ -1712,7 +1769,9 @@ ip_vs_del_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest) / * Delete the destination / - __ip_vs_del_dest(svc->ipvs, dest, false); + __ip_vs_del_dest(svc->ipvs, dest, &dest_trash, false); + + ip_vs_trash_save_dests(svc->ipvs, &dest_trash, false); return 0; } @@ -2057,7 +2116,8 @@ ip_vs_edit_service(struct ip_vs_service svc, struct ip_vs_service_user_kern u) - The service must be unlinked, unlocked and not referenced! * - We are called under _bh lock / -static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup) +static void __ip_vs_del_service(struct ip_vs_service svc, + struct list_head dest_trash, bool cleanup) { struct ip_vs_dest dest, nxt; struct ip_vs_scheduler old_sched; @@ -2091,7 +2151,7 @@ static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup) / list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) { __ip_vs_unlink_dest(svc, dest, 0); - __ip_vs_del_dest(svc->ipvs, dest, cleanup); + __ip_vs_del_dest(svc->ipvs, dest, dest_trash, cleanup); } / @@ -2114,7 +2174,8 @@ static void __ip_vs_del_service(struct ip_vs_service svc, bool cleanup) / * Unlink a service from list and try to delete it if its refcnt reached 0 / -static void ip_vs_unlink_service(struct ip_vs_service svc, bool cleanup) +static void ip_vs_unlink_service(struct ip_vs_service svc, + struct list_head dest_trash, bool cleanup) { ip_vs_unregister_conntrack(svc); /* Hold svc to avoid double release from dest_trash / @@ -2124,7 +2185,7 @@ static void ip_vs_unlink_service(struct ip_vs_service svc, bool cleanup) / ip_vs_svc_unhash(svc); - __ip_vs_del_service(svc, cleanup); + __ip_vs_del_service(svc, dest_trash, cleanup); } / @@ -2134,12 +2195,14 @@ static int ip_vs_del_service(struct ip_vs_service svc) { struct netns_ipvs ipvs; struct ip_vs_rht t, p; + LIST_HEAD(dest_trash); int ns; if (svc == NULL) return -EEXIST; ipvs = svc->ipvs; - ip_vs_unlink_service(svc, false); + ip_vs_unlink_service(svc, &dest_trash, false); + ip_vs_trash_save_dests(ipvs, &dest_trash, false); /* Drop the table if no more services / ns = ip_vs_get_num_services(ipvs); @@ -2190,6 +2253,7 @@ static int ip_vs_flush(struct netns_ipvs ipvs, bool cleanup) struct hlist_bl_node ne; struct hlist_bl_node e; struct ip_vs_rht t, p; + LIST_HEAD(dest_trash); /* Stop the resizer and drop the tables / if (!test_and_set_bit(IP_VS_WORK_SVC_NORESIZE, &ipvs->work_flags)) @@ -2199,8 +2263,9 @@ static int ip_vs_flush(struct netns_ipvs ipvs, bool cleanup) if (ip_vs_get_num_services(ipvs)) { ip_vs_rht_walk_buckets(ipvs->svc_table, head) { hlist_bl_for_each_entry_safe(svc, e, ne, head, s_list) - ip_vs_unlink_service(svc, cleanup); + ip_vs_unlink_service(svc, &dest_trash, cleanup); } + ip_vs_trash_save_dests(ipvs, &dest_trash, cleanup); } /* Unregister the hash table and release it after RCU grace period / diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c index fb8af6b15a3999..83d1443ebe01e5 100644 --- a/net/netfilter/ipvs/ip_vs_proto_sctp.c +++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c @@ -30,6 +30,7 @@ sctp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, sch = skb_header_pointer(skb, iph->len + sizeof(_sctph), sizeof(_schunkh), &_schunkh); if (sch) { + / Accept packet without scheduling? / if (sch->type == SCTP_CID_ABORT \|\| !(sysctl_sloppy_sctp(ipvs) \|\| sch->type == SCTP_CID_INIT)) @@ -47,6 +48,10 @@ sctp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, return 0; } + / Do not create connection for port 0, skip the packet / + if (!ports[0] \|\| !ports[1]) + return 1; + if (likely(!ip_vs_iph_inverse(iph))) svc = ip_vs_service_find(ipvs, af, skb->mark, iph->protocol, &iph->daddr, ports[1]); diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c index fec0e8b47b7165..2e55b62445c60c 100644 --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c @@ -48,6 +48,7 @@ tcp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, if (likely(!ip_vs_iph_icmp(iph))) { th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph); if (th) { + / Accept packet without scheduling? / if (th->rst \|\| !(sysctl_sloppy_tcp(ipvs) \|\| th->syn)) return 1; ports = &th->source; @@ -62,6 +63,10 @@ tcp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, return 0; } + / Do not create connection for port 0, skip the packet / + if (!ports[0] \|\| !ports[1]) + return 1; + / No !th->ack check to allow scheduling on SYN+ACK for Active FTP / if (likely(!ip_vs_iph_inverse(iph))) diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c index f32785682402dd..92c0b76c1a021a 100644 --- a/net/netfilter/ipvs/ip_vs_proto_udp.c +++ b/net/netfilter/ipvs/ip_vs_proto_udp.c @@ -52,6 +52,10 @@ udp_conn_schedule(struct netns_ipvs ipvs, int af, struct sk_buff skb, return 0; } + / Do not create connection for port 0, skip the packet / + if (!ports[0] \|\| !ports[1]) + return 1; + if (likely(!ip_vs_iph_inverse(iph))) svc = ip_vs_service_find(ipvs, af, skb->mark, iph->protocol, &iph->daddr, ports[1]); diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c index 06242c86e1dc83..e9e796bda57715 100644 --- a/net/netfilter/nf_conntrack_expect.c +++ b/net/netfilter/nf_conntrack_expect.c @@ -299,13 +299,22 @@ void nf_ct_unexpect_related(struct nf_conntrack_expect exp) } EXPORT_SYMBOL_GPL(nf_ct_unexpect_related); -/* We don't increase the master conntrack refcount for non-fulfilled - * conntracks. During the conntrack destruction, the expectations are - * always killed before the conntrack itself / +/* + * nf_ct_expect_alloc - allocate a new conntrack expectation + * @me: The conntrack to be used as master. + * + * The master conntrack refcount is not incremented; expectations + * are always killed before the master conntrack is destroyed. + * + * Returns a new expectation on success or NULL on failure. + / struct nf_conntrack_expect nf_ct_expect_alloc(struct nf_conn me) { struct nf_conntrack_expect new; + if (!nf_ct_master_acceptable(me)) + return NULL; + new = kmem_cache_zalloc(nf_ct_expect_cachep, GFP_ATOMIC); if (!new) return NULL; diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 1f8d94a0524032..30428d520e432b 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -2231,6 +2231,26 @@ ctnetlink_change_conntrack(struct nf_conn ct, return 0; } +static struct nf_conn +ctnetlink_find_get_master(struct net net, const struct nf_conntrack_zone zone, + const struct nf_conntrack_tuple tuple) +{ + struct nf_conntrack_tuple_hash master_h; + struct nf_conn master_ct; + + master_h = nf_conntrack_find_get(net, zone, tuple); + if (!master_h) + return ERR_PTR(-ENOENT); + + master_ct = nf_ct_tuplehash_to_ctrack(master_h); + if (!nf_ct_master_acceptable(master_ct)) { + nf_ct_put(master_ct); + return ERR_PTR(-EMLINK); + } + + return master_ct; +} + static struct nf_conn ctnetlink_create_conntrack(struct net net, const struct nf_conntrack_zone zone, @@ -2356,7 +2376,6 @@ ctnetlink_create_conntrack(struct net net, / setup master conntrack: this is a confirmed expectation / if (cda[CTA_TUPLE_MASTER]) { struct nf_conntrack_tuple master; - struct nf_conntrack_tuple_hash master_h; struct nf_conn master_ct; err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, @@ -2364,12 +2383,11 @@ ctnetlink_create_conntrack(struct net net, if (err < 0) goto err2; - master_h = nf_conntrack_find_get(net, zone, &master); - if (master_h == NULL) { - err = -ENOENT; + master_ct = ctnetlink_find_get_master(net, zone, &master); + if (IS_ERR(master_ct)) { + err = PTR_ERR(master_ct); goto err2; } - master_ct = nf_ct_tuplehash_to_ctrack(master_h); __set_bit(IPS_EXPECTED_BIT, &ct->status); ct->master = master_ct; } @@ -3613,7 +3631,6 @@ ctnetlink_create_expect(struct net net, u_int8_t u3, u32 portid, int report) { struct nf_conntrack_tuple tuple, mask, master_tuple; - struct nf_conntrack_tuple_hash h = NULL; struct nf_conntrack_expect exp; struct nf_conn ct; int err; @@ -3633,10 +3650,9 @@ ctnetlink_create_expect(struct net net, return err; / Look for master conntrack of this expectation / - h = nf_conntrack_find_get(net, zone, &master_tuple); - if (!h) - return -ENOENT; - ct = nf_ct_tuplehash_to_ctrack(h); + ct = ctnetlink_find_get_master(net, zone, &master_tuple); + if (IS_ERR(ct)) + return PTR_ERR(ct); rcu_read_lock(); exp = ctnetlink_alloc_expect(cda, ct, NULL, &tuple, &mask); diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 64bc440b1181f1..b05dc8858d094d 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -701,9 +701,9 @@ static int ct_sip_parse_transport(struct nf_conn ct, const char dptr, if (ct_sip_parse_param(ct, dptr, dataoff, datalen, "transport=", &matchoff, &matchlen)) { - if (!strncasecmp(dptr + matchoff, "TCP", strlen("TCP"))) + if (matchlen >= 3 && !strncasecmp(dptr + matchoff, "TCP", 3)) proto = IPPROTO_TCP; - else if (!strncasecmp(dptr + matchoff, "UDP", strlen("UDP"))) + else if (matchlen >= 3 && !strncasecmp(dptr + matchoff, "UDP", 3)) proto = IPPROTO_UDP; else return 0; diff --git a/net/netfilter/nf_dup_netdev.c b/net/netfilter/nf_dup_netdev.c index c6bd5c29bed66d..918716629c1556 100644 --- a/net/netfilter/nf_dup_netdev.c +++ b/net/netfilter/nf_dup_netdev.c @@ -12,6 +12,7 @@ #include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_offload.h> #include <net/netfilter/nf_dup_netdev.h> +#include <net/netfilter/nf_recursion.h> static void nf_do_netdev_egress(struct sk_buff skb, struct net_device dev, enum nf_dev_hooks hook) diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 0d72dc8ae47a13..2aa2647ed9df06 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -544,6 +544,7 @@ static void nf_flow_table_extend_ct_timeout(struct nf_conn ct) switch (l4proto) { case IPPROTO_UDP: + case IPPROTO_GRE: new_timeout = NF_CT_DAY; break; case IPPROTO_TCP: diff --git a/net/netfilter/nf_nat_masquerade.c b/net/netfilter/nf_nat_masquerade.c index 4de6e0a517015b..c2a85bd84af131 100644 --- a/net/netfilter/nf_nat_masquerade.c +++ b/net/netfilter/nf_nat_masquerade.c @@ -62,8 +62,7 @@ nf_nat_masquerade_ipv4(struct sk_buff skb, unsigned int hooknum, nat->masq_index = out->ifindex; / Transfer from original range. / - memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); - memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + memset(&newrange, 0, sizeof(newrange)); newrange.flags = range->flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr.ip = newsrc; newrange.max_addr.ip = newsrc; @@ -242,6 +241,7 @@ nf_nat_masquerade_ipv6(struct sk_buff skb, const struct nf_nat_range2 range, if (nat) nat->masq_index = out->ifindex; + memset(&newrange, 0, sizeof(newrange)); newrange.flags = range->flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr.in6 = src; newrange.max_addr.in6 = src; diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c index 166d05e994ac6c..bd603e3a99a59d 100644 --- a/net/netfilter/nf_queue.c +++ b/net/netfilter/nf_queue.c @@ -219,6 +219,7 @@ static int __nf_queue(struct sk_buff skb, const struct nf_hook_state state, entry = (struct nf_queue_entry) { .skb = skb, .skb_dev = skb->dev, + .in_nf_duplicate = current->in_nf_duplicate, .state = state, .hook_index = index, .size = sizeof(entry) + route_key_size, diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 59ac623e6805f1..8b94b5e7dbdbd0 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -760,16 +760,6 @@ static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule) if (trans == NULL) return -ENOMEM; - if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) { - flow = nft_flow_rule_create(ctx->net, rule); - if (IS_ERR(flow)) { - nft_trans_destroy(trans); - return PTR_ERR(flow); - } - - nft_trans_flow_rule(trans) = flow; - } - err = nf_tables_delrule_deactivate(ctx, rule); if (err < 0) { nft_trans_destroy(trans); @@ -777,6 +767,14 @@ static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule) } nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE); + if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) { + flow = nft_flow_rule_create(ctx->net, rule); + if (IS_ERR(flow)) + return PTR_ERR(flow); + + nft_trans_flow_rule(trans) = flow; + } + return 0; } @@ -4570,8 +4568,7 @@ static int nf_tables_newrule(struct sk_buff skb, const struct nfnl_info info, err_destroy_flow_rule: nft_use_dec_restore(&chain->use); err_destroy_flow: - if (flow) - nft_flow_rule_destroy(flow); + nft_flow_rule_destroy(flow); err_release_rule: nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR); nf_tables_rule_destroy(&ctx, rule); diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c index 0ac3c26dfb3d16..48b9e58e0c44f1 100644 --- a/net/netfilter/nf_tables_offload.c +++ b/net/netfilter/nf_tables_offload.c @@ -148,6 +148,9 @@ void nft_flow_rule_destroy(struct nft_flow_rule flow) struct flow_action_entry entry; int i; + if (!flow) + return; + flow_action_for_each(i, entry, &flow->rule->action) { switch (entry->id) { case FLOW_ACTION_REDIRECT: diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index 90d887546f7db1..a8aa7ad832c3f3 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -44,6 +44,7 @@ #include <net/sock.h> #include <net/tcp_states.h> #include <net/netfilter/nf_queue.h> +#include <net/net_debug.h> #include <net/netns/generic.h> #include <linux/atomic.h> @@ -365,21 +366,30 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict) const struct nf_hook_entry hook_entry; const struct nf_hook_entries hooks; struct sk_buff skb = entry->skb; + bool old_in_nf_duplicate; const struct net net; unsigned int i; int err; u8 pf; + DEBUG_NET_WARN_ONCE(current->in_nf_duplicate && + !entry->in_nf_duplicate, + "%s called with unexpected duplication guard", + __func__); + local_bh_disable(); + old_in_nf_duplicate = current->in_nf_duplicate; + net = entry->state.net; pf = entry->state.pf; + current->in_nf_duplicate = entry->in_nf_duplicate; hooks = nf_hook_entries_head(net, pf, entry->state.hook); i = entry->hook_index; if (!hooks \|\| i >= hooks->num_hook_entries) { kfree_skb_reason(skb, SKB_DROP_REASON_NETFILTER_DROP); nf_queue_entry_free(entry); - return; + goto out; } hook_entry = &hooks->hooks[i]; @@ -402,9 +412,7 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict) switch (verdict & NF_VERDICT_MASK) { case NF_ACCEPT: case NF_STOP: - local_bh_disable(); entry->state.okfn(entry->state.net, entry->state.sk, skb); - local_bh_enable(); break; case NF_QUEUE: err = nf_queue(skb, &entry->state, i, verdict); @@ -418,6 +426,9 @@ static void nf_reinject(struct nf_queue_entry entry, unsigned int verdict) } nf_queue_entry_free(entry); +out: + current->in_nf_duplicate = old_in_nf_duplicate; + local_bh_enable(); } / return true if the entry has an unconfirmed conntrack attached that isn't owned by us diff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c index a48c2f765bbaad..7447da931a9576 100644 --- a/net/netfilter/nft_fwd_netdev.c +++ b/net/netfilter/nft_fwd_netdev.c @@ -14,6 +14,7 @@ #include <net/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_offload.h> #include <net/netfilter/nf_dup_netdev.h> +#include <net/netfilter/nf_recursion.h> #include <net/neighbour.h> #include <net/ip.h> diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c index fbe1750f1ca232..9d685899da7018 100644 --- a/net/netfilter/nft_set_rbtree.c +++ b/net/netfilter/nft_set_rbtree.c @@ -953,7 +953,8 @@ static void nft_rbtree_gc_queue(struct nft_set set) } gc = nft_trans_gc_catchall_sync(gc); - nft_trans_gc_queue_sync_done(gc); + if (gc) + nft_trans_gc_queue_sync_done(gc); } static u64 nft_rbtree_privsize(const struct nlattr const nla[], diff --git a/net/netfilter/xt_NETMAP.c b/net/netfilter/xt_NETMAP.c index 7da065a472e0ec..8bcb3f716d68aa 100644 --- a/net/netfilter/xt_NETMAP.c +++ b/net/netfilter/xt_NETMAP.c @@ -44,6 +44,7 @@ netmap_tg6(struct sk_buff skb, const struct xt_action_param par) netmask.ip6[i]; } + memset(&newrange, 0, sizeof(newrange)); newrange.flags = range->flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr = new_addr; newrange.max_addr = new_addr; @@ -91,8 +92,7 @@ netmap_tg4(struct sk_buff skb, const struct xt_action_param par) new_ip = ip_hdr(skb)->saddr & ~netmask; new_ip \|= mr->range[0].min_ip & netmask; - memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); - memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); + memset(&newrange, 0, sizeof(newrange)); newrange.flags = mr->range[0].flags \| NF_NAT_RANGE_MAP_IPS; newrange.min_addr.ip = new_ip; newrange.max_addr.ip = new_ip; diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index 55f1f2d89952d0..00cccf003cff5e 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -650,14 +650,15 @@ static void __net_exit recent_proc_net_exit(struct net net) / recent_net_exit() is called before recent_mt_destroy(). Make sure * that the parent xt_recent proc entry is empty before trying to - * remove it. + * remove it. Use recent_mutex instead of recent_lock since + * remove_proc_entry() may sleep. */ - spin_lock_bh(&recent_lock); + mutex_lock(&recent_mutex); list_for_each_entry(t, &recent_net->tables, list) remove_proc_entry(t->name, recent_net->xt_recent); recent_net->xt_recent = NULL; - spin_unlock_bh(&recent_lock); + mutex_unlock(&recent_mutex); remove_proc_entry("xt_recent", net->proc_net); }
65/3	2026/11/02 06:02	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 17616 output: 39 thoughts: 1455 Thoughts: KMSAN Fuzzing Session Justification Okay, so I'm looking at this patch series and trying to figure out if it warrants a dedicated KMSAN fuzzing session. Let's break down these netfilter changes piece by piece. First, some header file renamings and conditional changes – mostly about recursion helpers, which aren't necessarily immediately concerning, but I'll make a note. Then, RCU grace period handling in IPVS dest trash/rehash. Fine, RCU is always good to check with KMSAN. Adding `rcu_state` and `need_gp` to `struct ip_vs_dest`... definitely worth a closer look at the actual code touching that. And, of course, the `kfree_rcu` change. The expectation chain length limit in conntrack seems like a reasonable hardening measure against recursion and potential stack overflows. I need to understand that max depth of 2 limitation though; seems pretty low; may want to increase it to at least 4. Moving recursion helpers to a single header makes sense from an organizational perspective. Saving and restoring `current->in_nf_duplicate` in the queue entry – okay, that's potentially interesting. I'll want to check how that variable is used and if it could interact with other parts of the kernel. The `DEBUG_NET_WARN_ON_ONCE` instead of `WARN_ON_ONCE` is a non-issue. The `t->verdict` changes in those table files… that's got my attention. Why were those conditionals adjusted? It warrants some detailed context. I'll need to check the function, `mark_source_chains`, to understand what this means. The recursion check with `nf_dev_xmit_recursion()` is good for preventing loops in the reject code. That's a good defensive addition; but worth double-checking that it's robust. Okay, more IPVS changes. Checking `!cport` in `ip_vs_new_conn_out` and the reordering of the init/cleanup. I'll need to review those sections, but this seems like a solid fix to possible race. Also, the zero check in various protocols is also good. The SIP fixes look like basic bounds checking, which is always welcome. Adding `IPPROTO_GRE` to the timeout extension is straightforward. And this `memset` change. Why? `memset` changes should always be flagged for review, since they can hint at initialization issues. I'll definitely check those parts. `nf_nat_masquerade.c` and `xt_NETMAP.c` warrant some deeper investigation given those `memset` modifications. Reordering of rule destruction/creation in `nft_delrule` and null checks are generally fine. `Mutex` lock in `xt_recent.c` is also a non-issue. Alright, I've got a decent grasp on what's been changed. Now, I need to go through each of these areas, particularly the ones that look like they're touching RCU, recursion, or memory initialization. The table verdict changes and `memset` changes are priority areas. I need to pull up the code and look at it in detail. Depending on the severity and number of potential KMSAN-detectable issues, a dedicated fuzzing session might be warranted, or I might simply decide that this isn't high-risk. But a more detailed inspection of the changes is the next step.
66/3	2026/11/02 06:02	tool	grepper	0m Args: { "Expression": "mark_source_chains", "PathPrefixes": [ "net/ipv4/netfilter/ip_tables.c" ] } Results: { "Output": "net/ipv4/netfilter/ip_tables.c=366=static int\nnet/ipv4/netfilter/ip_tables.c:367:mark_source_chains(const struct xt_table_info newinfo,\nnet/ipv4/netfilter/ip_tables.c-368-\t\t unsigned int valid_hooks, void entry0,\n--\nnet/ipv4/netfilter/ip_tables.c=661=translate_table(struct net net, struct xt_table_info newinfo, void *entry0,\n--\nnet/ipv4/netfilter/ip_tables.c-707-\nnet/ipv4/netfilter/ip_tables.c:708:\tif (!mark_source_chains(newinfo, repl-\u003evalid_hooks, entry0, offsets)) {\nnet/ipv4/netfilter/ip_tables.c-709-\t\tret = -ELOOP;\n" }
67/3	2026/11/02 06:02	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 20092 output: 41 thoughts: 36 Thoughts: Okay, let's dive into this. Here's how I'd approach that kernel code snippet, focusing on the mental process: Diving into `ip_tables.c` Alright, so someone's asked me to look at `net/ipv4/netfilter/ip_tables.c` around lines 415-440. Immediately, I'm thinking, "Okay, `ip_tables.c` – that's the core of the IPv4 packet filtering framework, the heart of `iptables`. Line numbers... that's always a good starting point, gives me a manageable chunk to focus on. They haven't specified a reason to look at those lines, so I'll need to figure out what's going on there. I'll need context, so I'll probably start by looking at what functions are being defined, or called around that code block. What's the overarching functionality that this section is responsible for?" My first instinct is, I'll probably want to use a tool like `cscope` or `ctags`, or just plain `grep` to quickly get an idea of the surrounding code and the functions called within that region. See what functions are defined or called, what data structures are involved. Maybe I'll start by checking the function prototypes defined around those lines, see if I can understand what functions are defined around the lines and how they're used. I should check if there are any comments - that would make this much easier! Then, I'll need to understand the logic. "What's the control flow? What data structures are manipulated? What's the intended outcome?" I'll likely need to trace through the code, maybe use a debugger if it's complex enough, to see how the code handles different scenarios. I'm looking for the purpose of that specific chunk: rule handling? table manipulation? something with the netfilter hook framework? It's important to remember that these kernel subsystems are often interwoven, so I should be prepared to consider interactions with other files and modules as I delve deeper. I'm going to keep an open mind and prepare to be surprised!
68/3	2026/11/02 06:02	tool	read-file	0m Args: { "File": "net/ipv4/netfilter/ip_tables.c", "FirstLine": 410, "LineCount": 40 } Results: { "Contents": " 410:\t\t\t\t\t\t/* We're at the start. /\n 411:\t\t\t\t\t\tif (pos == oldpos)\n 412:\t\t\t\t\t\t\tgoto next;\n 413:\t\n 414:\t\t\t\t\t\te = entry0 + pos;\n 415:\t\t\t\t\t} while (oldpos == pos + e-\u003enext_offset);\n 416:\t\n 417:\t\t\t\t\t/ Move along one /\n 418:\t\t\t\t\tsize = e-\u003enext_offset;\n 419:\t\t\t\t\te = entry0 + pos + size;\n 420:\t\t\t\t\tif (pos + size \u003e= newinfo-\u003esize)\n 421:\t\t\t\t\t\treturn 0;\n 422:\t\t\t\t\te-\u003ecounters.pcnt = pos;\n 423:\t\t\t\t\tpos += size;\n 424:\t\t\t\t} else {\n 425:\t\t\t\t\tint newpos;\n 426:\t\n 427:\t\t\t\t\tif (strcmp(t-\u003etarget.u.user.name,\n 428:\t\t\t\t\t\t XT_STANDARD_TARGET) == 0 \u0026\u0026\n 429:\t\t\t\t\t t-\u003everdict \u003e= 0) {\n 430:\t\t\t\t\t\tnewpos = t-\u003everdict;\n 431:\t\t\t\t\t\t/ This a jump; chase it. /\n 432:\t\t\t\t\t\tif (!xt_find_jump_offset(offsets, newpos,\n 433:\t\t\t\t\t\t\t\t\t newinfo-\u003enumber))\n 434:\t\t\t\t\t\t\treturn 0;\n 435:\t\t\t\t\t} else {\n 436:\t\t\t\t\t\t/ ... this is a fallthru */\n 437:\t\t\t\t\t\tnewpos = pos + e-\u003enext_offset;\n 438:\t\t\t\t\t\tif (newpos \u003e= newinfo-\u003esize)\n 439:\t\t\t\t\t\t\treturn 0;\n 440:\t\t\t\t\t}\n 441:\t\t\t\t\te = entry0 + newpos;\n 442:\t\t\t\t\te-\u003ecounters.pcnt = pos;\n 443:\t\t\t\t\tpos = newpos;\n 444:\t\t\t\t}\n 445:\t\t\t}\n 446:\tnext:\t\t;\n 447:\t\t}\n 448:\t\treturn 1;\n 449:\t}\n" }
69/3	2026/11/02 06:02	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21167 output: 41 thoughts: 50 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience: Debugging a Source Chain Marking Routine Alright, I'm deep in `mark_source_chains`, trying to understand its behavior. I've hit a line: `int newpos = t->verdict;` and I'm pausing. The immediate question flashing is, "What the hell is `t`?" It's a pointer, obviously, but without context, its type and what it represents are opaque. We're talking about source chains, so it's probably related to some kind of transaction or data structure within that context, but I need to be sure. I need to backtrack, check the function signature and the call stack to see where `t` is coming from within the broader picture of how `mark_source_chains` is being called. That's the only way to get a solid handle on what's going on with that `->verdict` member. Understanding the lineage of `t` is the key to understanding this particular step in marking the source chains.
70/3	2026/11/02 06:03	tool	read-file	0m Args: { "File": "net/ipv4/netfilter/ip_tables.c", "FirstLine": 390, "LineCount": 35 } Results: { "Contents": " 390:\t\t\t\tif (e-\u003ecomefrom \u0026 (1 \u003c\u003c NF_INET_NUMHOOKS))\n 391:\t\t\t\t\treturn 0;\n 392:\t\n 393:\t\t\t\te-\u003ecomefrom \|= ((1 \u003c\u003c hook) \| (1 \u003c\u003c NF_INET_NUMHOOKS));\n 394:\t\n 395:\t\t\t\t/* Unconditional return/END. /\n 396:\t\t\t\tif ((unconditional(e) \u0026\u0026\n 397:\t\t\t\t (strcmp(t-\u003etarget.u.user.name,\n 398:\t\t\t\t\t XT_STANDARD_TARGET) == 0) \u0026\u0026\n 399:\t\t\t\t t-\u003everdict \u003c 0) \|\| visited) {\n 400:\t\t\t\t\tunsigned int oldpos, size;\n 401:\t\n 402:\t\t\t\t\t/ Return: backtrack through the last\n 403:\t\t\t\t\t big jump. /\n 404:\t\t\t\t\tdo {\n 405:\t\t\t\t\t\te-\u003ecomefrom ^= (1\u003c\u003cNF_INET_NUMHOOKS);\n 406:\t\t\t\t\t\toldpos = pos;\n 407:\t\t\t\t\t\tpos = e-\u003ecounters.pcnt;\n 408:\t\t\t\t\t\te-\u003ecounters.pcnt = 0;\n 409:\t\n 410:\t\t\t\t\t\t/ We're at the start. /\n 411:\t\t\t\t\t\tif (pos == oldpos)\n 412:\t\t\t\t\t\t\tgoto next;\n 413:\t\n 414:\t\t\t\t\t\te = entry0 + pos;\n 415:\t\t\t\t\t} while (oldpos == pos + e-\u003enext_offset);\n 416:\t\n 417:\t\t\t\t\t/ Move along one */\n 418:\t\t\t\t\tsize = e-\u003enext_offset;\n 419:\t\t\t\t\te = entry0 + pos + size;\n 420:\t\t\t\t\tif (pos + size \u003e= newinfo-\u003esize)\n 421:\t\t\t\t\t\treturn 0;\n 422:\t\t\t\t\te-\u003ecounters.pcnt = pos;\n 423:\t\t\t\t\tpos += size;\n 424:\t\t\t\t} else {\n" }
71/3	2026/11/02 06:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21998 output: 41 thoughts: 1157 Thoughts: Analyzing Potential Memory Safety Issues in Netfilter Code Okay, let's break this down. First, I'm looking at this patch and my initial thought is, "Whoa, that's a potential memory read vulnerability!" Specifically, in the iptables code, I'm seeing this access of `t->verdict`. The code casts a generic target pointer (`t`) to an `xt_standard_target` pointer, but then immediately reads from `t->verdict` unconditionally! The key is `ipt_get_target_c(e)`. If the target isn't actually an `xt_standard_target` (meaning `strcmp(t->target.u.user.name, XT_STANDARD_TARGET) != 0`), reading `t->verdict` is just accessing memory past the target's declared size or reading uninitialized memory. If the target is smaller than the structure declared, it could even be out-of-bounds, or reading uninitialized data! But wait! I see it! The patch fixes this. Now, the code only reads `t->verdict` if the target is indeed an `xt_standard_target`! The patch changes this: int newpos = t->verdict; to int newpos; if (strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0 && t->verdict >= 0) { newpos = t->verdict; So, this patch isn't introducing a memory risk, it's fixing one. It's making sure we only read `t->verdict` when it's safe to do so. This is critical for security, and this fix should be applied asap! Now, I need to check the context of that fix. I'm going to scan the other files the patch touches. Let's look at `nf_nat_masquerade.c` and `xt_NETMAP.c`. I see `memset(&newrange, 0, sizeof(newrange));` is added to the files. These lines are: memset(&newrange, 0, sizeof(newrange)); memset(&newrange, 0, sizeof(newrange)); I have to carefully analyze what `newrange` is used for and what's initialized here, and the changes around `memset` to determine if any uninitialized memory risks are introduced in these two files.
72/3	2026/11/02 06:03	tool	read-file	0m Args: { "File": "net/netfilter/nf_nat_masquerade.c", "FirstLine": 50, "LineCount": 40 } Results: { "Contents": " 50:\t\t\treturn NF_ACCEPT;\n 51:\t\n 52:\t\trt = skb_rtable(skb);\n 53:\t\tnh = rt_nexthop(rt, ip_hdr(skb)-\u003edaddr);\n 54:\t\tnewsrc = inet_select_addr(out, nh, RT_SCOPE_UNIVERSE);\n 55:\t\tif (!newsrc) {\n 56:\t\t\tpr_info(\"%s ate my IP address\\n\", out-\u003ename);\n 57:\t\t\treturn NF_DROP;\n 58:\t\t}\n 59:\t\n 60:\t\tnat = nf_ct_nat_ext_add(ct);\n 61:\t\tif (nat)\n 62:\t\t\tnat-\u003emasq_index = out-\u003eifindex;\n 63:\t\n 64:\t\t/* Transfer from original range. /\n 65:\t\tmemset(\u0026newrange, 0, sizeof(newrange));\n 66:\t\tnewrange.flags = range-\u003eflags \| NF_NAT_RANGE_MAP_IPS;\n 67:\t\tnewrange.min_addr.ip = newsrc;\n 68:\t\tnewrange.max_addr.ip = newsrc;\n 69:\t\tnewrange.min_proto = range-\u003emin_proto;\n 70:\t\tnewrange.max_proto = range-\u003emax_proto;\n 71:\t\n 72:\t\t/ Hand modified range to generic setup. /\n 73:\t\treturn nf_nat_setup_info(ct, \u0026newrange, NF_NAT_MANIP_SRC);\n 74:\t}\n 75:\tEXPORT_SYMBOL_GPL(nf_nat_masquerade_ipv4);\n 76:\t\n 77:\tstatic void iterate_cleanup_work(struct work_struct work)\n 78:\t{\n 79:\t\tstruct nf_ct_iter_data iter_data = {};\n 80:\t\tstruct masq_dev_work w;\n 81:\t\n 82:\t\tw = container_of(work, struct masq_dev_work, work);\n 83:\t\n 84:\t\titer_data.net = w-\u003enet;\n 85:\t\titer_data.data = (void )w;\n 86:\t\tnf_ct_iterate_cleanup_net(w-\u003eiter, \u0026iter_data);\n 87:\t\n 88:\t\tput_net_track(w-\u003enet, \u0026w-\u003ens_tracker);\n 89:\t\tkfree(w);\n" }
73/3	2026/11/02 06:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 24365 output: 30 thoughts: 135 Thoughts: Uninitialized Variable in nf_nat_masquerade.c Alright, let's dive into this `nf_nat_masquerade.c` code. Hmm, interesting... they're zeroing out `newrange.min_addr` and `newrange.max_addr` using `memset`. Good practice to initialize, generally. But wait, what exactly is `newrange`? Ah, right, a `struct nf_nat_range2` declared on the stack. Now, what isn't being explicitly initialized in that structure? Let me refresh my memory and check the definition of `nf_nat_range2`. Hold on... base_proto! I'm pretty sure it doesn't get initialized! I need to confirm this quickly. I need to figure out what the consequences of leaving that uninitialized are.
74/3	2026/11/02 06:03	tool	grepper	0m Args: { "Expression": "struct nf_nat_range2", "PathPrefixes": [ "include/" ] } Results: { "Output": "include/net/netfilter/nf_nat.h=39=unsigned int nf_nat_setup_info(struct nf_conn ct,\ninclude/net/netfilter/nf_nat.h:40:\t\t\t const struct nf_nat_range2 range,\ninclude/net/netfilter/nf_nat.h-41-\t\t\t enum nf_nat_manip_type maniptype);\n--\ninclude/net/netfilter/nf_nat.h=107=int nf_ct_nat(struct sk_buff skb, struct nf_conn ct,\ninclude/net/netfilter/nf_nat.h-108-\t enum ip_conntrack_info ctinfo, int action,\ninclude/net/netfilter/nf_nat.h:109:\t const struct nf_nat_range2 range, bool commit);\ninclude/net/netfilter/nf_nat.h-110-\n--\ninclude/net/netfilter/nf_nat_masquerade.h=9=nf_nat_masquerade_ipv4(struct sk_buff skb, unsigned int hooknum,\ninclude/net/netfilter/nf_nat_masquerade.h:10:\t\t const struct nf_nat_range2 range,\ninclude/net/netfilter/nf_nat_masquerade.h-11-\t\t const struct net_device out);\n--\ninclude/net/netfilter/nf_nat_masquerade.h=16=unsigned int\ninclude/net/netfilter/nf_nat_masquerade.h:17:nf_nat_masquerade_ipv6(struct sk_buff skb, const struct nf_nat_range2 range,\ninclude/net/netfilter/nf_nat_masquerade.h-18-\t\t const struct net_device out);\n--\ninclude/net/netfilter/nf_nat_redirect.h=8=unsigned int\ninclude/net/netfilter/nf_nat_redirect.h:9:nf_nat_redirect_ipv4(struct sk_buff skb, const struct nf_nat_range2 range,\ninclude/net/netfilter/nf_nat_redirect.h-10-\t\t unsigned int hooknum);\ninclude/net/netfilter/nf_nat_redirect.h=11=unsigned int\ninclude/net/netfilter/nf_nat_redirect.h:12:nf_nat_redirect_ipv6(struct sk_buff skb, const struct nf_nat_range2 range,\ninclude/net/netfilter/nf_nat_redirect.h-13-\t\t unsigned int hooknum);\n--\ninclude/net/tc_act/tc_ct.h=12=struct tcf_ct_params {\n--\ninclude/net/tc_act/tc_ct.h-22-\ninclude/net/tc_act/tc_ct.h:23:\tstruct nf_nat_range2 range;\ninclude/net/tc_act/tc_ct.h-24-\tbool ipv4_range;\n--\ninclude/uapi/linux/netfilter/nf_nat.h=38=struct nf_nat_range {\n--\ninclude/uapi/linux/netfilter/nf_nat.h-45-\ninclude/uapi/linux/netfilter/nf_nat.h:46:struct nf_nat_range2 {\ninclude/uapi/linux/netfilter/nf_nat.h-47-\tunsigned int\t\t\tflags;\n" }
75/3	2026/11/02 06:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 25560 output: 42 thoughts: 27 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience and presented in the first person: Diving into the NAT Implementation Alright, time to get my hands dirty. I need to refresh my memory on the specifics of the NAT implementation. Specifically, I'm thinking about the structure definitions used by the Netfilter NAT subsystem. Let's start with `include/uapi/linux/netfilter/nf_nat.h`. I recall that file contains the core data structures we're interested in. I'm going to jump straight to line 46, because that's usually where the critical `nf_nat_range` or `nf_nat_tuple` struct definitions are. It could also be the start of important enum definitions. Time to see what's what and make a mental note on anything important I haven't seen in a while. Gotta refresh my understanding before digging deeper.
76/3	2026/11/02 06:03	tool	read-file	0m Args: { "File": "include/uapi/linux/netfilter/nf_nat.h", "FirstLine": 40, "LineCount": 20 } Results: { "Contents": " 40:\t\tunion nf_inet_addr\t\tmin_addr;\n 41:\t\tunion nf_inet_addr\t\tmax_addr;\n 42:\t\tunion nf_conntrack_man_proto\tmin_proto;\n 43:\t\tunion nf_conntrack_man_proto\tmax_proto;\n 44:\t};\n 45:\t\n 46:\tstruct nf_nat_range2 {\n 47:\t\tunsigned int\t\t\tflags;\n 48:\t\tunion nf_inet_addr\t\tmin_addr;\n 49:\t\tunion nf_inet_addr\t\tmax_addr;\n 50:\t\tunion nf_conntrack_man_proto\tmin_proto;\n 51:\t\tunion nf_conntrack_man_proto\tmax_proto;\n 52:\t\tunion nf_conntrack_man_proto\tbase_proto;\n 53:\t};\n 54:\t\n 55:\t#endif /* _NETFILTER_NF_NAT_H */\n" }
77/3	2026/11/02 06:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 26080 output: 51 thoughts: 895 Thoughts: Analyzing Potential Uninitialized Memory Issues Okay, so this patch series caught my eye, and I need to carefully evaluate whether it introduces or resolves uninitialized memory vulnerabilities. The initial change involving `struct nf_nat_range2` and its `base_proto` field is what triggered my concern. Before the patch, it seems `memset` was used, but it only cleared `min_addr` and `max_addr`, leaving `base_proto` uninitialized in certain scenarios, like IPv6 masquerade and NETMAP IPv6. The fix explicitly uses `memset(&newrange, 0, sizeof(newrange));` to zero out the entire struct. This fixes the uninitialized memory issue in `nf_nat_masquerade.c` and `xt_NETMAP.c`. Now, I need to check if any other changes in the patch series introduce risks. The guidelines state to set `NeedsKMSAN=true` if the patch touches kernel structures sent to userspace, relies on uninitialized variables in conditional logic, allocates complex data structures with uninitialized fields, or introduces vulnerabilities in bounds checks that can lead to uninitialized bytes being read. If the patch only addresses out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (which are already caught by existing tools), or if structures are fully zeroed/initialized, then `NeedsKMSAN=false`. My goal is to determine if this patch introduces new issues or simply fixes pre-existing ones. I'll go through the diffs file by file. 1. `include/linux/netdevice_xmit.h`: Here, it's just a rename of `nf_dup_skb_recursion` to `nf_xmit_skb_recursion` and broadening the config to `CONFIG_NETFILTER`. The `struct netdev_xmit` is either zero-initialized in `softnet_data` (per-cpu, BSS) or in the `current->net_xmit` which is embedded in `task_struct` and zero-initialized on fork/init. No uninitialized memory issues here. 2. `include/net/ip_vs.h` and `net/netfilter/ipvs/ip_vs_ctl.c`: New fields are added to `struct ip_vs_dest`. Now I'll need to check the allocation and initialization of `ip_vs_dest`. A quick `grep` for `ip_vs_dest` allocation should reveal the relevant code paths. I need to confirm if these new fields are properly initialized.
78/3	2026/11/02 06:03	tool	grepper	0m Args: { "Expression": "kzalloc.sizeof\$struct ip_vs_dest\$\|kmem_cache_zalloc.dest", "PathPrefixes": [ "net/netfilter/ipvs/" ] } Results: { "Output": "no matches" }
79/3	2026/11/02 06:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27608 output: 38 thoughts: 26 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Diving into IPVS Destination Structure Size Alright, time to get my hands dirty. I'm thinking I need to understand the memory footprint of a `struct ip_vs_dest`. That usually means I'm troubleshooting some memory-related issue, profiling, or optimizing IPVS performance at a granular level. So, my initial thought is: let's jump straight into the kernel source. More specifically, I'm going to leverage my familiarity with the `netfilter` subsystem and the IPVS implementation. To zero in on the exact structure definition, the most efficient approach is a good old `grep`. I'll target the `net/netfilter/ipvs/` directory within the kernel source tree. I’ll search directly for `sizeof(struct ip_vs_dest)`. That should quickly uncover any relevant instances of that structure being used in calculations or comparisons and, critically, tell me the compiler-determined size of the structure. Knowing this size allows me to immediately have an idea of the resources being used and will tell me, at a glance, if the structure's size is what I would expect based on the code.
80/3	2026/11/02 06:03	tool	grepper	0m Args: { "Expression": "sizeof\$struct ip_vs_dest\$", "PathPrefixes": [ "net/netfilter/ipvs/" ] } Results: { "Output": "no matches" }
81/3	2026/11/02 06:03	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27943 output: 43 thoughts: 29 Thoughts: Here's a summary of my thought process, as requested: Diving into the `ip_vs_ctl.c` Code Okay, so I need to understand how destinations are being added within the IP Virtual Server (IPVS) kernel module. My immediate approach is to zero in on the relevant code. Given my familiarity with the codebase, I'm going to start by looking for key function calls or variable assignments that likely handle this. Specifically, I'm thinking I'll `grep` through `ip_vs_ctl.c` for either `ip_vs_add_dest` (which I strongly suspect is the function responsible for adding destinations) or, even more generically, a direct assignment like `dest = `. This should quickly identify where destination addition logic is likely taking place and highlight the relevant lines of code. It's a pragmatic starting point, and I can always broaden my search later if this initial approach doesn't yield immediate results. I'm aiming for efficiency here – direct to the likely candidate!
82/3	2026/11/02 06:04	tool	grepper	0m Args: { "Expression": "ip_vs_add_dest", "PathPrefixes": [ "net/netfilter/ipvs/ip_vs_ctl.c" ] } Results: { "Output": "net/netfilter/ipvs/ip_vs_ctl.c=1560=static int\nnet/netfilter/ipvs/ip_vs_ctl.c:1561:ip_vs_add_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\nnet/netfilter/ipvs/ip_vs_ctl.c-1562-{\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=3538=do_ip_vs_set_ctl(struct sock sk, int cmd, sockptr_t ptr, unsigned int len)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-3667-\tcase IP_VS_SO_SET_ADDDEST:\nnet/netfilter/ipvs/ip_vs_ctl.c:3668:\t\tret = ip_vs_add_dest(svc, \u0026udest);\nnet/netfilter/ipvs/ip_vs_ctl.c-3669-\t\tbreak;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=4751=static int ip_vs_genl_set_cmd(struct sk_buff skb, struct genl_info *info)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4861-\tcase IPVS_CMD_NEW_DEST:\nnet/netfilter/ipvs/ip_vs_ctl.c:4862:\t\tret = ip_vs_add_dest(svc, \u0026udest);\nnet/netfilter/ipvs/ip_vs_ctl.c-4863-\t\tbreak;\n" }
83/3	2026/11/02 06:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 28647 output: 44 thoughts: 35 Thoughts: Okay, let's dive into this. Here's how I'd approach summarizing the section of `ip_vs_ctl.c` you've pinpointed: Diving into `ip_vs_add_dest` Alright, I'm going to focus on lines 1620 to 1650 within `ip_vs_ctl.c`, specifically the `ip_vs_add_dest` function. I know this is where the core logic for adding a destination server to an IPVS virtual service resides. Given my experience, I'm expecting this section to deal with things like parsing the user-provided parameters (IP address, port, weight, connection limit, etc.), performing validation checks to ensure the input makes sense and the resources are available, and then ultimately, adding the new destination to the appropriate internal data structures that manage the forwarding rules. I'm especially interested in how the function handles error conditions and gracefully rejects invalid destination configurations. I also want to see how the code interfaces with the lower-level IPVS core functionality to actually implement the destination's addition. I imagine there's a good chunk of code here, potentially involving memory allocation and manipulation of kernel-level structures. I'm looking for the specifics of how connection limits, weights, and other parameters are integrated into the destination entry.
84/3	2026/11/02 06:04	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/ip_vs_ctl.c", "FirstLine": 1620, "LineCount": 40 } Results: { "Contents": "1620:\t\t\t} else {\n1621:\t\t\t\t/* Readers may still follow the n_list/d_list of the\n1622:\t\t\t\t * unlinked dest, wait before linking it again.\n1623:\t\t\t\t /\n1624:\t\t\t\tcond_synchronize_rcu(dest-\u003ercu_state);\n1625:\t\t\t\t/ need_gp matters only on dest edit, reinit it /\n1626:\t\t\t\tdest-\u003eneed_gp = 0;\n1627:\t\n1628:\t\t\t\t__ip_vs_update_dest(svc, dest, udest, 1);\n1629:\t\t\t}\n1630:\t\t} else {\n1631:\t\t\t/\n1632:\t\t\t * Allocate and initialize the dest structure\n1633:\t\t\t /\n1634:\t\t\tret = ip_vs_new_dest(svc, udest);\n1635:\t\t}\n1636:\t\n1637:\t\treturn ret;\n1638:\t}\n1639:\t\n1640:\t\n1641:\t/\n1642:\t \tEdit a destination in the given service\n1643:\t /\n1644:\tstatic int\n1645:\tip_vs_edit_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n1646:\t{\n1647:\t\tstruct ip_vs_dest *dest;\n1648:\t\tunion nf_inet_addr daddr;\n1649:\t\t__be16 dport = udest-\u003eport;\n1650:\t\n1651:\t\tif (udest-\u003eweight \u003c 0) {\n1652:\t\t\tpr_err(\"%s(): server weight less than zero\\n\", __func__);\n1653:\t\t\treturn -ERANGE;\n1654:\t\t}\n1655:\t\n1656:\t\tif (udest-\u003el_threshold \u003e udest-\u003eu_threshold) {\n1657:\t\t\tpr_err(\"%s(): lower threshold is higher than upper threshold\\n\",\n1658:\t\t\t\t__func__);\n1659:\t\t\treturn -ERANGE;\n" }
85/3	2026/11/02 06:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 29570 output: 43 thoughts: 14 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: Diving into `ip_vs_new_dest` Alright, time to get to the core of this investigation. Given the context of what we're working on, my gut feeling is that the issue is likely going to present itself as something related to how we're selecting and assigning new destination addresses. That leads me to thinking that it's worth checking `ip_vs_new_dest` and seeing what's happening at the point where new destinations are determined. This is where the load balancing logic, and potentially any policy decisions, come into play. It's a critical path, and a logical starting point for debugging any kind of destination selection problem. Let's see what's happening there.
86/3	2026/11/02 06:04	tool	grepper	0m Args: { "Expression": "ip_vs_new_dest", "PathPrefixes": [ "net/netfilter/ipvs/ip_vs_ctl.c" ] } Results: { "Output": "net/netfilter/ipvs/ip_vs_ctl.c=1491=static int\nnet/netfilter/ipvs/ip_vs_ctl.c:1492:ip_vs_new_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\nnet/netfilter/ipvs/ip_vs_ctl.c-1493-{\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=1561=ip_vs_add_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-1633-\t\t */\nnet/netfilter/ipvs/ip_vs_ctl.c:1634:\t\tret = ip_vs_new_dest(svc, udest);\nnet/netfilter/ipvs/ip_vs_ctl.c-1635-\t}\n" }
87/3	2026/11/02 06:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30058 output: 44 thoughts: 13 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and presented as if it were my own internal monologue: Diving into `ip_vs_new_dest` Alright, time to crack open `ip_vs_new_dest`. I know this function is critical within the IPVS framework. It's the point where we're making the pivotal decision – selecting a new destination for incoming traffic. I immediately start thinking about the context: is this connection new? Is the previous connection active or stale? That impacts what algorithms are used and what states have to be considered. I’m expecting to see the core logic for the scheduling decisions: hashing, least-connections, weighted round robin, all that good stuff. I'm wondering if there are any performance bottlenecks or subtle race conditions I need to be aware of within the current implementation. I’ll be checking how it interacts with the persistent connection table, the various flags and options passed down from the upper layers, and of course, how it handles things like health checks and server availability. I’m particularly interested in seeing how it deals with destination selection when no destinations are available. I'll need to confirm that there's a robust failover mechanism in place, and that we don’t inadvertently blackhole traffic in certain edge cases. It's a key function for maintaining reliability, load balancing and throughput. Time to get my hands dirty and start dissecting the code.
88/3	2026/11/02 06:04	tool	read-file	0m Args: { "File": "net/netfilter/ipvs/ip_vs_ctl.c", "FirstLine": 1491, "LineCount": 40 } Results: { "Contents": "1491:\tstatic int\n1492:\tip_vs_new_dest(struct ip_vs_service svc, struct ip_vs_dest_user_kern udest)\n1493:\t{\n1494:\t\tstruct ip_vs_dest *dest;\n1495:\t\tunsigned int atype;\n1496:\t\tint ret;\n1497:\t\n1498:\t#ifdef CONFIG_IP_VS_IPV6\n1499:\t\tif (udest-\u003eaf == AF_INET6) {\n1500:\t\t\tatype = ipv6_addr_type(\u0026udest-\u003eaddr.in6);\n1501:\t\t\tif ((!(atype \u0026 IPV6_ADDR_UNICAST) \|\|\n1502:\t\t\t\tatype \u0026 IPV6_ADDR_LINKLOCAL) \u0026\u0026\n1503:\t\t\t\t!__ip_vs_addr_is_local_v6(svc-\u003eipvs-\u003enet, \u0026udest-\u003eaddr.in6))\n1504:\t\t\t\treturn -EINVAL;\n1505:\t\n1506:\t\t\tret = nf_defrag_ipv6_enable(svc-\u003eipvs-\u003enet);\n1507:\t\t\tif (ret)\n1508:\t\t\t\treturn ret;\n1509:\t\t} else\n1510:\t#endif\n1511:\t\t{\n1512:\t\t\tatype = inet_addr_type(svc-\u003eipvs-\u003enet, udest-\u003eaddr.ip);\n1513:\t\t\tif (atype != RTN_LOCAL \u0026\u0026 atype != RTN_UNICAST)\n1514:\t\t\t\treturn -EINVAL;\n1515:\t\t}\n1516:\t\n1517:\t\tdest = kzalloc_obj(struct ip_vs_dest);\n1518:\t\tif (dest == NULL)\n1519:\t\t\treturn -ENOMEM;\n1520:\t\n1521:\t\tret = ip_vs_stats_init_alloc(\u0026dest-\u003estats);\n1522:\t\tif (ret \u003c 0)\n1523:\t\t\tgoto err_alloc;\n1524:\t\n1525:\t\tret = ip_vs_start_estimator(svc-\u003eipvs, \u0026dest-\u003estats);\n1526:\t\tif (ret \u003c 0)\n1527:\t\t\tgoto err_stats;\n1528:\t\n1529:\t\tdest-\u003eaf = udest-\u003eaf;\n1530:\t\tdest-\u003eprotocol = svc-\u003eprotocol;\n" }
89/3	2026/11/02 06:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 31047 output: 36 thoughts: 447 Thoughts: My Analysis of `struct ip_vs_dest` and RCU Synchronization Okay, let me break down this code snippet concerning `struct ip_vs_dest`. First, it's clear that `kzalloc_obj(struct ip_vs_dest)` zeroes out the entire structure when a new one is allocated. That's good; it ensures a clean slate, especially important for managing RCU states. Now, let's look at the lifecycle and how it affects RCU synchronization. When a `dest` is "trashed" (likely meaning it's being removed or decommissioned), `ip_vs_trash_save_dests` is called. Here, `rcu_state` is acquired using `get_state_synchronize_rcu()` which is then set for each `dest` in the trash list. This looks like an attempt to keep track of the RCU grace period. The `ip_vs_rs_hash` function shows that, if `dest->need_gp` is set, `cond_synchronize_rcu(dest->rcu_state)` is used to wait for the grace period before proceeding. This is the expected behavior, ensuring that any readers still holding a reference to the old `dest` can complete their operations before it's truly freed or modified. `dest->need_gp` is then cleared after the RCU synchronization. The `ip_vs_add_dest` function also calls `cond_synchronize_rcu` on creation with `dest->rcu_state` and then clears `dest->need_gp`. In `__ip_vs_update_dest`, there's a more interesting situation. The code checks if the forwarding method, tunnel type, or tunnel port of `udest` (the update destination) differs from the original `dest`. If so, `ip_vs_rs_unhash(dest)` unlinks the old `dest`. Critically, if the destination was previously in the RS table, the `rcu_state` is acquired again (implying the need for a new grace period) and `dest->need_gp` is set. This indicates a potential race, as the old destination is removed from the RS table but may still have readers. The `need_gp` flag signals the need for synchronization before further operations on it. So, it seems all `rcu_state` and `need_gp` fields are initialized properly, either to zero or set before being read. This shows a good understanding of RCU synchronization. Now, I'm going to shift gears. This is all well and good for the kernel. However, how is this data exposed to user space? I need to check how the `struct ip_vs_dest` is copied to userspace. I have to make sure that the RCU state and grace period management are handled properly if this data is being shared with user processes. Otherwise, we could have a nasty race condition or information leakage, or even worse, crash.
90/3	2026/11/02 06:04	tool	grepper	0m Args: { "Expression": "copy_to_user.dest", "PathPrefixes": [ "net/netfilter/ipvs/" ] } Results:* { "Output": "no matches" }
91/3	2026/11/02 06:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 32182 output: 61 thoughts: 22 Thoughts: Here's a summary of my thought process, as requested: Diving into `ip_vs_ctl.c` to Understand Dest Info Copying Okay, so I'm thinking about the mechanics of how destination information is transferred to userspace from within `ip_vs_ctl.c`. I need to fully grasp this process for my work. I need to understand how the internal structures and data are handled, and how that information is then made available to user-level applications. This is critical for performance tuning and potentially identifying bottlenecks or areas for optimization within the IPVS system. I'm assuming there's likely some kind of memory copying involved, maybe using `copy_to_user` or a similar function, but I need to see the implementation details to be sure. I'm going to look for the specific functions that handle the dest info and follow the call paths to get the full picture. I expect it'll involve examining the netlink interactions, potentially looking at structure packing/unpacking, and maybe even some work with locks if concurrency is an issue. Time to dig in.
92/3	2026/11/02 06:04	tool	grepper	0m Args: { "Expression": "nla_put.dest\|ip_vs_genl_fill_dest\|ip_vs_copy_dest", "PathPrefixes": [ "net/netfilter/ipvs/ip_vs_ctl.c" ] } Results:* { "Output": "net/netfilter/ipvs/ip_vs_ctl.c=4362=static struct ip_vs_service ip_vs_genl_find_service(struct netns_ipvs ipvs,\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4372-\nnet/netfilter/ipvs/ip_vs_ctl.c:4373:static int ip_vs_genl_fill_dest(struct sk_buff skb, struct ip_vs_dest dest)\nnet/netfilter/ipvs/ip_vs_ctl.c-4374-{\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4381-\nnet/netfilter/ipvs/ip_vs_ctl.c:4382:\tif (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest-\u003eaddr), \u0026dest-\u003eaddr) \|\|\nnet/netfilter/ipvs/ip_vs_ctl.c:4383:\t nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest-\u003eport) \|\|\nnet/netfilter/ipvs/ip_vs_ctl.c-4384-\t nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4404-\t\t\tatomic_read(\u0026dest-\u003epersistconns)) \|\|\nnet/netfilter/ipvs/ip_vs_ctl.c:4405:\t nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest-\u003eaf))\nnet/netfilter/ipvs/ip_vs_ctl.c-4406-\t\tgoto nla_put_failure;\n--\nnet/netfilter/ipvs/ip_vs_ctl.c=4422=static int ip_vs_genl_dump_dest(struct sk_buff skb, struct ip_vs_dest dest,\n--\nnet/netfilter/ipvs/ip_vs_ctl.c-4432-\nnet/netfilter/ipvs/ip_vs_ctl.c:4433:\tif (ip_vs_genl_fill_dest(skb, dest) \u003c 0)\nnet/netfilter/ipvs/ip_vs_ctl.c-4434-\t\tgoto nla_put_failure;\n" }
93/3	2026/11/02 06:04	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33104 output: 37 thoughts: 2079 Thoughts: Code Review: Memory Safety and Potential Vulnerabilities Okay, let's break this down. First, the kernel internals, `rcu_state` and `need_gp`, never leak to userspace, that's good. Now, looking at `nf_queue`, specifically the `nf_queue_entry` structure: I see that `in_nf_duplicate` is explicitly set to the current task's `in_nf_duplicate`. The use of the C99 designated initializer zeroes any uninitialized fields, preventing information leakage. The code seems to ensure proper initialization and propagation of this flag during queueing and re-injection. Also, upon examining `nfnetlink_queue.c`, I'm confident that this field is not transmitted to userspace, which is an important security consideration. So far, so good. Next, I examined the conntrack code, specifically the `nf_ct_master_acceptable` checks. There's a depth limit (`NF_CT_MAX_EXPECT_CHAIN_LEN`) to prevent excessive nesting, and no obvious uninitialized memory issues there. It seems robust. Then, the recursion checks in `nf_reject_ipv4.c` and `nf_reject_ipv6.c`: The recursion limit is correctly implemented using `nf_dev_xmit_recursion` to avoid potential stack overflows and infinite loops, another good defensive coding practice. The port checks in `ip_vs_proto_sctp.c`, `tcp.c`, and `udp.c` also look fine. Preventing connections with port 0 is a standard practice and is correctly implemented. The `nf_conntrack_sip.c` fix is excellent: the protection against out-of-bounds reads in the SIP parsing code, by ensuring that the `matchlen` is at least 3, is a crucial vulnerability mitigation. The extension of the conntrack timeout for GRE in `nf_flow_table_core.c` makes sense. Finally, the `nft_delrule` function in `nf_tables_api.c` raises a red flag. Here, there's a potential memory leak. If the `nft_flow_rule_create` function fails after `nf_tables_delrule_deactivate` and `nft_rule_expr_deactivate` are called, it returns, but the `trans` structure might not be properly cleaned up. It's unclear whether `trans` is allocated only if the subsequent `nft_flow_rule_create` call succeeds, or if it's allocated regardless. This warrants very careful examination. It is a classic example of an early return with resource allocation. This will need further investigation.
94/3	2026/11/02 06:05	tool	grepper	0m Args: { "Expression": "nft_delrule", "PathPrefixes": [ "net/netfilter/nf_tables_api.c" ] } Results: { "Output": "net/netfilter/nf_tables_api.c=733=static struct nft_trans nft_trans_rule_add(struct nft_ctx ctx, int msg_type,\n--\nnet/netfilter/nf_tables_api.c-752-\nnet/netfilter/nf_tables_api.c:753:static int nft_delrule(struct nft_ctx ctx, struct nft_rule rule)\nnet/netfilter/nf_tables_api.c-754-{\n--\nnet/netfilter/nf_tables_api.c-780-\nnet/netfilter/nf_tables_api.c:781:static int nft_delrule_by_chain(struct nft_ctx ctx)\nnet/netfilter/nf_tables_api.c-782-{\n--\nnet/netfilter/nf_tables_api.c-789-\nnet/netfilter/nf_tables_api.c:790:\t\terr = nft_delrule(ctx, rule);\nnet/netfilter/nf_tables_api.c-791-\t\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=1709=static int nft_flush_table(struct nft_ctx ctx)\n--\nnet/netfilter/nf_tables_api.c-1725-\nnet/netfilter/nf_tables_api.c:1726:\t\terr = nft_delrule_by_chain(ctx);\nnet/netfilter/nf_tables_api.c-1727-\t\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=3330=static int nf_tables_delchain(struct sk_buff skb, const struct nfnl_info info,\n--\nnet/netfilter/nf_tables_api.c-3397-\nnet/netfilter/nf_tables_api.c:3398:\t\terr = nft_delrule(\u0026ctx, rule);\nnet/netfilter/nf_tables_api.c-3399-\t\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=4351=static int nf_tables_newrule(struct sk_buff skb, const struct nfnl_info info,\n--\nnet/netfilter/nf_tables_api.c-4528-\nnet/netfilter/nf_tables_api.c:4529:\t\terr = nft_delrule(\u0026ctx, old_rule);\nnet/netfilter/nf_tables_api.c-4530-\t\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=4605=static int nf_tables_delrule(struct sk_buff skb, const struct nfnl_info info,\n--\nnet/netfilter/nf_tables_api.c-4653-\nnet/netfilter/nf_tables_api.c:4654:\t\t\terr = nft_delrule(\u0026ctx, rule);\nnet/netfilter/nf_tables_api.c-4655-\t\t} else if (nla[NFTA_RULE_ID]) {\n--\nnet/netfilter/nf_tables_api.c-4661-\nnet/netfilter/nf_tables_api.c:4662:\t\t\terr = nft_delrule(\u0026ctx, rule);\nnet/netfilter/nf_tables_api.c-4663-\t\t} else {\nnet/netfilter/nf_tables_api.c:4664:\t\t\terr = nft_delrule_by_chain(\u0026ctx);\nnet/netfilter/nf_tables_api.c-4665-\t\t}\n--\nnet/netfilter/nf_tables_api.c-4673-\t\t\tctx.chain = chain;\nnet/netfilter/nf_tables_api.c:4674:\t\t\terr = nft_delrule_by_chain(\u0026ctx);\nnet/netfilter/nf_tables_api.c-4675-\t\t\tif (err \u003c 0)\n" }
95/3	2026/11/02 06:05	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36807 output: 40 thoughts: 22 Thoughts: Okay, let's dive into this. Analyzing `nft_delrule` around lines 750-780 Right, I need to get a better handle on this. I'm going to focus my attention on the `nft_delrule` function specifically around lines 750 to 780. I need to understand how it's deleting a rule. What are the key data structures involved? Is it traversing a linked list, using a hash table, or something else entirely? More importantly, what are the implications if the removal is faulty or fails in a certain way? Are there locks involved? Race conditions to consider? Memory management issues? I'm anticipating that these lines will be crucial in understanding the overall stability and performance of the rule deletion process, so I need to make sure I understand it well. Let's see what's happening.
96/3	2026/11/02 06:05	tool	read-file	0m Args: { "File": "net/netfilter/nf_tables_api.c", "FirstLine": 750, "LineCount": 40 } Results: { "Contents": " 750:\t\treturn trans;\n 751:\t}\n 752:\t\n 753:\tstatic int nft_delrule(struct nft_ctx ctx, struct nft_rule rule)\n 754:\t{\n 755:\t\tstruct nft_flow_rule flow;\n 756:\t\tstruct nft_trans trans;\n 757:\t\tint err;\n 758:\t\n 759:\t\ttrans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);\n 760:\t\tif (trans == NULL)\n 761:\t\t\treturn -ENOMEM;\n 762:\t\n 763:\t\terr = nf_tables_delrule_deactivate(ctx, rule);\n 764:\t\tif (err \u003c 0) {\n 765:\t\t\tnft_trans_destroy(trans);\n 766:\t\t\treturn err;\n 767:\t\t}\n 768:\t\tnft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);\n 769:\t\n 770:\t\tif (ctx-\u003echain-\u003eflags \u0026 NFT_CHAIN_HW_OFFLOAD) {\n 771:\t\t\tflow = nft_flow_rule_create(ctx-\u003enet, rule);\n 772:\t\t\tif (IS_ERR(flow))\n 773:\t\t\t\treturn PTR_ERR(flow);\n 774:\t\n 775:\t\t\tnft_trans_flow_rule(trans) = flow;\n 776:\t\t}\n 777:\t\n 778:\t\treturn 0;\n 779:\t}\n 780:\t\n 781:\tstatic int nft_delrule_by_chain(struct nft_ctx ctx)\n 782:\t{\n 783:\t\tstruct nft_rule rule;\n 784:\t\tint err;\n 785:\t\n 786:\t\tlist_for_each_entry(rule, \u0026ctx-\u003echain-\u003erules, list) {\n 787:\t\t\tif (!nft_is_active_next(ctx-\u003enet, rule))\n 788:\t\t\t\tcontinue;\n 789:\t\n" }
97/3	2026/11/02 06:05	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 37618 output: 592 thoughts: 3492 Thoughts: Analysis of Proposed Kernel Patches: KMSAN Applicability Determination Okay, let's break down these kernel patches and determine if we need to light up a KMSAN session. My goal here is clear: avoid unnecessary resource expenditure, which means avoiding a KMSAN run unless absolutely necessary. The overarching question is: do these patches introduce or exacerbate risks that only KMSAN can detect? I'm looking for uninitialized memory usage, leaks, and potential data corruption that KASAN, LOCKDEP, and standard kernel checks might miss. First, I've noticed a pattern in the way patches fix potential KMSAN issues. For example, in `nf_nat_masquerade.c` and `xt_NETMAP.c`, the patch adds `memset(&newrange, 0, sizeof(newrange))` to initialize `newrange`. This directly addresses pre-existing issues of uninitialized memory in `struct nf_nat_range2`. The goal here is to fix it. This is a fix, not an introduction of an uninitialized read. Likewise, `kzalloc_obj` is used to allocate destinations in other parts of the patchset, ensuring zero initialization and avoiding the issue altogether. The change in `arp_tables.c`, `ip_tables.c`, and `ip6_tables.c` also catches my attention. Before, we were unconditionally reading `t->verdict`. However, if the user supplied a non-standard target that was smaller, or in an uninitialized state, this could lead to reading uninitialized memory. The patch cleverly mitigates this by adding a check `strcmp(t->target.u.user.name, XT_STANDARD_TARGET) == 0`. It only reads `t->verdict` if the target is standard, so the problem is removed by only reading the data if it is valid. Additionally, `newpos` is explicitly assigned in both branches of the conditional logic. The patch is fixing this, not introducing it, so I am not too worried. Looking through the series, the following are KASAN/LOCKDEP/standard bug detector concerns: * RCU use-after-free fixed with `kfree_rcu` in `ip_vs_app`. * Recursion check / stack overflow prevention in `nf_reject`. * NULL pointer dereference fixed in `nft_rbtree_gc_queue`. * Sleeping while atomic fixed in `xt_recent` via `mutex_lock`. * Bounds check, out-of-bounds read prevention in `nf_conntrack_sip` via tighter length check. * Logic checks in `ip_vs_core`, and initialization order fixes. These patches fix issues like use-after-free, recursion, null pointers, and locking problems. These types of bugs are typically caught by KASAN, LOCKDEP, or standard kernel debug assertions. Crucially, none of these patches introduce or modify kernel structures that are sent to user space uninitialized. They don't have conditional logic or branching that relies on uninitialized variables. Complex data structures are either zero-initialized directly or allocated with methods that ensure initialization. The code is carefully setting up the memory to be safe, which negates the risk of a KMSAN issue. KMSAN fuzzing is a significant resource cost. My analysis confirms that KASAN, LOCKDEP, and the standard bug detectors are completely sufficient to catch any issues arising from this series. Therefore, `NeedsKMSAN` is definitely `false`. Now, let's generate the tool call output: `NeedsKMSAN`: false. `KMSANReasoning`: Provide a clear, thorough explanation contrasting KASAN vs KMSAN applicability across all changes in the patch series: 1. `nf_nat_masquerade` & `xt_NETMAP`: Patches explicitly fix prior uninitialized memory issues in `struct nf_nat_range2` by adding `memset(&newrange, 0, sizeof(newrange))`, ensuring the entire structure including `base_proto` is zeroed. 2. `arp_tables`, `ip_tables`, `ip6_tables`: Reading `t->verdict` is moved inside the standard target check, ensuring non-standard targets are not read as standard target verdicts; local variable `newpos` is initialized unconditionally in all branches. 3. `ip_vs` (dest trash, RCU, connection handling): Added fields (`rcu_state`, `need_gp`) to `struct ip_vs_dest` are zero-initialized via `kzalloc_obj` and maintained internally for RCU grace period tracking; `kfree_rcu` fixes a UAF bug (KASAN domain); init order and port 0
98/3	2026/11/02 06:05	tool	set-results	0m Args: { "KMSANReasoning": "The patch series consists of various bug fixes and hardening across Netfilter, IPVS, and related subsystems:\n\n1. Uninitialized Memory Fixes (nf_nat_masquerade.c, xt_NETMAP.c):\nThe changes replace partial memsets of min_addr/max_addr with full `memset(\u0026newrange, 0, sizeof(newrange))`, properly zeroing the entire stack struct (including `base_proto`). These changes remediate existing uninitialized stack variable reads rather than introducing them.\n\n2. Target Verdict Check (arp_tables.c, ip_tables.c, ip6_tables.c):\nIn `mark_source_chains()`, `t-\u003everdict` is now read only after verifying `strcmp(...) == 0` for XT_STANDARD_TARGET, preventing non-standard targets from being interpreted as `xt_standard_target`. The local variable `newpos` is assigned deterministically in both branches of the conditional, ensuring no uninitialized read occurs.\n\n3. IPVS and RCU Handling (ip_vs_.c, include/net/ip_vs.h):\nNew fields `rcu_state` and `need_gp` added to `struct ip_vs_dest` are fully zero-initialized via `kzalloc_obj` at allocation time and are purely internal kernel state. The change from `kfree` to `kfree_rcu` fixes a use-after-free race condition, which falls squarely under KASAN's detection capabilities. Module init/cleanup reordering and port 0 validation address lifecycle and logic issues.\n\n4. Netfilter Queue Entry (nf_queue.c, nfnetlink_queue.c, nf_queue.h):\nThe new `in_nf_duplicate` boolean on `struct nf_queue_entry` is initialized via designated initializer struct literal during allocation and is not exported to userspace.\n\n5. Other Subsystem Changes:\nRecursion limit guards (`nf_dev_xmit_recursion`) protect against stack overflow / infinite loops. Length checking in `nf_conntrack_sip` prevents out-of-bounds reads (covered by KASAN). The NULL check in `nft_rbtree_gc_queue` prevents NULL pointer dereference, and replacing a spinlock with a mutex in `xt_recent` prevents sleeping-while-atomic bugs (covered by LOCKDEP).\n\nNone of the changes introduce risks of uninitialized memory reads, uninitialized branching, or kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and existing kernel assertions are fully equipped to catch any potential regressions. A dedicated KMSAN run is not warranted.", "NeedsKMSAN": false } Results:* { "KMSANReasoning": "The patch series consists of various bug fixes and hardening across Netfilter, IPVS, and related subsystems:\n\n1. Uninitialized Memory Fixes (nf_nat_masquerade.c, xt_NETMAP.c):\nThe changes replace partial memsets of min_addr/max_addr with full `memset(\u0026newrange, 0, sizeof(newrange))`, properly zeroing the entire stack struct (including `base_proto`). These changes remediate existing uninitialized stack variable reads rather than introducing them.\n\n2. Target Verdict Check (arp_tables.c, ip_tables.c, ip6_tables.c):\nIn `mark_source_chains()`, `t-\u003everdict` is now read only after verifying `strcmp(...) == 0` for XT_STANDARD_TARGET, preventing non-standard targets from being interpreted as `xt_standard_target`. The local variable `newpos` is assigned deterministically in both branches of the conditional, ensuring no uninitialized read occurs.\n\n3. IPVS and RCU Handling (ip_vs_*.c, include/net/ip_vs.h):\nNew fields `rcu_state` and `need_gp` added to `struct ip_vs_dest` are fully zero-initialized via `kzalloc_obj` at allocation time and are purely internal kernel state. The change from `kfree` to `kfree_rcu` fixes a use-after-free race condition, which falls squarely under KASAN's detection capabilities. Module init/cleanup reordering and port 0 validation address lifecycle and logic issues.\n\n4. Netfilter Queue Entry (nf_queue.c, nfnetlink_queue.c, nf_queue.h):\nThe new `in_nf_duplicate` boolean on `struct nf_queue_entry` is initialized via designated initializer struct literal during allocation and is not exported to userspace.\n\n5. Other Subsystem Changes:\nRecursion limit guards (`nf_dev_xmit_recursion`) protect against stack overflow / infinite loops. Length checking in `nf_conntrack_sip` prevents out-of-bounds reads (covered by KASAN). The NULL check in `nft_rbtree_gc_queue` prevents NULL pointer dereference, and replacing a spinlock with a mutex in `xt_recent` prevents sleeping-while-atomic bugs (covered by LOCKDEP).\n\nNone of the changes introduce risks of uninitialized memory reads, uninitialized branching, or kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and existing kernel assertions are fully equipped to catch any potential regressions. A dedicated KMSAN run is not warranted.", "NeedsKMSAN": false }

LLM Calls Summary:
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Tool Calls Summary:
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