| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/09/14 02:39 | flow | patch-triage |
4mArgs:null Results: {
"EnableConfigs": [
"NET",
"NET_NS"
],
"FocusSymbols": [
"rtnl_dump_mcaddr",
"rtnl_dump_mcaddr_dev",
"rtnl_fill_mcaddr",
"rtnl_valid_dump_mcaddr_req"
],
"KMSANReasoning": "The patch series introduces AF_PACKET support for RTM_GETMULTICAST netlink dumps, adding rtnl_fill_mcaddr(), rtnl_dump_mcaddr_dev(), and rtnl_dump_mcaddr().\n\nDetailed analysis of memory safety and sanitizers applicability:\n1. Kernel-to-user info leaks:\n - The message payload header `struct ifaddrmsg` contains five fields (ifa_family, ifa_prefixlen, ifa_flags, ifa_scope, ifa_index) totaling 8 bytes with zero padding holes. All 5 fields are explicitly assigned in rtnl_fill_mcaddr().\n - Alignment padding in netlink message headers and netlink attributes is automatically zeroed by __nlmsg_put() and __nla_reserve() (via memset()).\n - The link-layer hardware address attribute IFA_MULTICAST copies exactly `dev-\u003eaddr_len` bytes from `ha-\u003eaddr`. When `struct netdev_hw_addr` is allocated and added (in __hw_addr_create), `dev-\u003eaddr_len` bytes are populated into `ha-\u003eaddr`. Thus no uninitialized bytes past `dev-\u003eaddr_len` are ever read or exposed.\n - Other attributes (IFA_TARGET_NETNSID, IFA_MC_USERS, IFA_FLAGS) are 4-byte scalar integers with no uninitialized bytes or padding.\n\n2. Uninitialized variables / conditional branches:\n - Local stack structure `struct rtnl_mcaddr_dump_filter filter` is initialized with designated initializers, guaranteeing that all other fields (ns_tracker, ifindex) are zeroed.\n - The netlink dump state `cb-\u003ectx` is guaranteed zero-initialized by __netlink_dump_start() via memset().\n\n3. KASAN vs KMSAN:\n - The potential risks introduced by this patch involve RCU lifetime (RCU read locks, dev_get_by_index_rcu), locking (netif_addr_lock_bh), netns tracking reference counts (put_net_track), and skb length limits (-EMSGSIZE / nlmsg_cancel). All of these are monitored and caught by standard debug builds (KASAN, LOCKDEP, refcount checks).\n - There are no uninitialized memory reads or information leaks that would be unique to KMSAN.\n\nTherefore, dedicated KMSAN fuzzing is not needed.",
"NeedsKMSAN": false,
"Reasoning": "The patch adds support for dumping link-layer multicast addresses via rtnetlink (RTM_GETMULTICAST with protocol/family AF_PACKET) in net/core/rtnetlink.c. This introduces new parsing, validation, device iteration under RCU and netif_addr_lock_bh, network namespace tracking, and netlink message formatting. The code is in the core networking subsystem and directly accessible from userspace over NETLINK_ROUTE sockets in standard virtualized environments.",
"WorthFuzzing": true
} |
| 1/1 | 2026/09/14 02:39 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit c4f5c94bdbc1fa681f251ed4e4efc6e0cdfe08dd\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Sep 14 02:39:01 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/Documentation/netlink/specs/rt-addr.yaml b/Documentation/netlink/specs/rt-addr.yaml\nindex 0ecbd24c890c6..1a17e55d1cca0 100644\n--- a/Documentation/netlink/specs/rt-addr.yaml\n+++ b/Documentation/netlink/specs/rt-addr.yaml\n@@ -77,6 +77,8 @@ definitions:\n name: mcautojoin\n -\n name: stable-privacy\n+ -\n+ name: global\n \n attribute-sets:\n -\n@@ -119,7 +121,7 @@ attribute-sets:\n type: u32\n -\n name: target-netnsid\n- type: binary\n+ type: s32\n -\n name: proto\n type: u8\n@@ -168,7 +170,13 @@ operations:\n attributes: *ifaddr-all\n -\n name: getmulticast\n- doc: Get / dump IPv4/IPv6 multicast addresses.\n+ doc: |\n+ Get / dump multicast addresses. ifa-family must select the address\n+ family: AF_INET or AF_INET6 for the IP multicast groups joined on\n+ a device, AF_PACKET for the link-layer multicast addresses in the\n+ device filter. Link-layer entries added explicitly, e.g. with\n+ SIOCADDMULTI or \"bridge fdb add ... self\", rather than by a\n+ protocol join are reported with the global flag set.\n attribute-set: addr-attrs\n fixed-header: ifaddrmsg\n do:\n@@ -181,10 +189,13 @@ operations:\n - multicast\n - mc-users\n - cacheinfo\n+ - flags\n+ - target-netnsid\n dump:\n request:\n value: 58\n- attributes: []\n+ attributes:\n+ - target-netnsid\n reply:\n value: 58\n attributes: *mcaddr-attrs\ndiff --git a/include/uapi/linux/if_addr.h b/include/uapi/linux/if_addr.h\nindex 7fb630b7fe311..0a1ad9ebb47be 100644\n--- a/include/uapi/linux/if_addr.h\n+++ b/include/uapi/linux/if_addr.h\n@@ -57,6 +57,7 @@ enum {\n #define IFA_F_NOPREFIXROUTE\t0x200\n #define IFA_F_MCAUTOJOIN\t0x400\n #define IFA_F_STABLE_PRIVACY\t0x800\n+#define IFA_F_GLOBAL\t\t0x1000\n \n struct ifa_cacheinfo {\n \t__u32\tifa_prefered;\ndiff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c\nindex be9d1625bac31..5f3e692a828b8 100644\n--- a/net/core/rtnetlink.c\n+++ b/net/core/rtnetlink.c\n@@ -4571,6 +4571,178 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)\n \treturn skb-\u003elen ? : ret;\n }\n \n+static int rtnl_fill_mcaddr(struct sk_buff *skb, const struct net_device *dev,\n+\t\t\t const struct netdev_hw_addr *ha, u32 portid,\n+\t\t\t u32 seq, unsigned int flags, int netnsid)\n+{\n+\tu32 ifa_flags = ha-\u003eglobal_use ? IFA_F_GLOBAL : 0;\n+\tstruct ifaddrmsg *ifm;\n+\tstruct nlmsghdr *nlh;\n+\n+\tnlh = nlmsg_put(skb, portid, seq, RTM_GETMULTICAST, sizeof(*ifm),\n+\t\t\tflags);\n+\tif (!nlh)\n+\t\treturn -EMSGSIZE;\n+\n+\tifm = nlmsg_data(nlh);\n+\tifm-\u003eifa_family = AF_PACKET;\n+\tifm-\u003eifa_prefixlen = 0;\n+\t/* ifm-\u003eifa_flags holds 8 bits, the full value is in IFA_FLAGS */\n+\tifm-\u003eifa_flags = (__u8)ifa_flags;\n+\tifm-\u003eifa_scope = RT_SCOPE_LINK;\n+\tifm-\u003eifa_index = dev-\u003eifindex;\n+\n+\tif ((netnsid \u003e= 0 \u0026\u0026\n+\t nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)) ||\n+\t nla_put(skb, IFA_MULTICAST, dev-\u003eaddr_len, ha-\u003eaddr) ||\n+\t nla_put_u32(skb, IFA_MC_USERS, ha-\u003erefcount) ||\n+\t nla_put_u32(skb, IFA_FLAGS, ifa_flags)) {\n+\t\tnlmsg_cancel(skb, nlh);\n+\t\treturn -EMSGSIZE;\n+\t}\n+\n+\tnlmsg_end(skb, nlh);\n+\treturn 0;\n+}\n+\n+static int rtnl_dump_mcaddr_dev(struct net_device *dev, struct sk_buff *skb,\n+\t\t\t\tstruct netlink_callback *cb, int *s_addr_idx,\n+\t\t\t\tunsigned int flags, int netnsid)\n+{\n+\tstruct netdev_hw_addr *ha;\n+\tint addr_idx = 0;\n+\tint err = 0;\n+\n+\tnetif_addr_lock_bh(dev);\n+\tnetdev_for_each_mc_addr(ha, dev) {\n+\t\tif (addr_idx \u003c *s_addr_idx) {\n+\t\t\taddr_idx++;\n+\t\t\tcontinue;\n+\t\t}\n+\t\terr = rtnl_fill_mcaddr(skb, dev, ha, NETLINK_CB(cb-\u003eskb).portid,\n+\t\t\t\t cb-\u003enlh-\u003enlmsg_seq, flags, netnsid);\n+\t\tif (err \u003c 0)\n+\t\t\tbreak;\n+\t\taddr_idx++;\n+\t}\n+\tnetif_addr_unlock_bh(dev);\n+\n+\t*s_addr_idx = err \u003c 0 ? addr_idx : 0;\n+\n+\treturn err;\n+}\n+\n+struct rtnl_mcaddr_dump_filter {\n+\tstruct net *tgt_net;\n+\tnetns_tracker ns_tracker;\n+\tint netnsid;\n+\tint ifindex;\n+};\n+\n+static const struct nla_policy rtnl_mcaddr_dump_policy[IFA_MAX + 1] = {\n+\t[IFA_TARGET_NETNSID]\t= { .type = NLA_S32 },\n+};\n+\n+static int rtnl_valid_dump_mcaddr_req(const struct nlmsghdr *nlh,\n+\t\t\t\t struct sock *sk,\n+\t\t\t\t struct rtnl_mcaddr_dump_filter *filter,\n+\t\t\t\t struct netlink_ext_ack *extack)\n+{\n+\tstruct nlattr *tb[IFA_MAX + 1];\n+\tstruct ifaddrmsg *ifm;\n+\tint err;\n+\n+\tifm = nlmsg_payload(nlh, sizeof(*ifm));\n+\tif (!ifm) {\n+\t\tNL_SET_ERR_MSG(extack,\n+\t\t\t \"Invalid header for multicast dump request\");\n+\t\treturn -EINVAL;\n+\t}\n+\n+\tif (ifm-\u003eifa_prefixlen || ifm-\u003eifa_flags || ifm-\u003eifa_scope) {\n+\t\tNL_SET_ERR_MSG(extack,\n+\t\t\t \"Invalid values in multicast dump header\");\n+\t\treturn -EINVAL;\n+\t}\n+\n+\terr = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,\n+\t\t\t rtnl_mcaddr_dump_policy, extack);\n+\tif (err \u003c 0)\n+\t\treturn err;\n+\n+\tif (tb[IFA_TARGET_NETNSID]) {\n+\t\tstruct net *net;\n+\n+\t\tfilter-\u003enetnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);\n+\t\tnet = rtnl_get_net_ns_capable(sk, filter-\u003enetnsid);\n+\t\tif (IS_ERR(net)) {\n+\t\t\tNL_SET_ERR_MSG(extack,\n+\t\t\t\t \"Invalid target network namespace id\");\n+\t\t\treturn PTR_ERR(net);\n+\t\t}\n+\t\tnetns_tracker_alloc(net, \u0026filter-\u003ens_tracker, GFP_KERNEL);\n+\t\tfilter-\u003etgt_net = net;\n+\t}\n+\n+\tfilter-\u003eifindex = ifm-\u003eifa_index;\n+\n+\treturn 0;\n+}\n+\n+static int rtnl_dump_mcaddr(struct sk_buff *skb, struct netlink_callback *cb)\n+{\n+\tstruct rtnl_mcaddr_dump_filter filter = {\n+\t\t.tgt_net = sock_net(skb-\u003esk),\n+\t\t.netnsid = -1,\n+\t};\n+\tunsigned int flags = NLM_F_MULTI;\n+\tstruct {\n+\t\tunsigned long ifindex;\n+\t\tint addr_idx;\n+\t} *ctx = (void *)cb-\u003ectx;\n+\tunsigned long s_ifindex;\n+\tstruct net_device *dev;\n+\tint err;\n+\n+\terr = rtnl_valid_dump_mcaddr_req(cb-\u003enlh, skb-\u003esk, \u0026filter,\n+\t\t\t\t\t cb-\u003eextack);\n+\tif (err \u003c 0)\n+\t\treturn err;\n+\n+\trcu_read_lock();\n+\n+\tif (filter.ifindex) {\n+\t\tcb-\u003eanswer_flags |= NLM_F_DUMP_FILTERED;\n+\t\tflags |= NLM_F_DUMP_FILTERED;\n+\t\tdev = dev_get_by_index_rcu(filter.tgt_net, filter.ifindex);\n+\t\tif (!dev) {\n+\t\t\terr = -ENODEV;\n+\t\t\tgoto out;\n+\t\t}\n+\t\terr = rtnl_dump_mcaddr_dev(dev, skb, cb, \u0026ctx-\u003eaddr_idx, flags,\n+\t\t\t\t\t filter.netnsid);\n+\t\tgoto out;\n+\t}\n+\n+\ts_ifindex = ctx-\u003eifindex;\n+\tfor_each_netdev_dump(filter.tgt_net, dev, ctx-\u003eifindex) {\n+\t\t/* The device the dump stopped at is gone, do not skip\n+\t\t * entries of the next one.\n+\t\t */\n+\t\tif (dev-\u003eifindex != s_ifindex)\n+\t\t\tctx-\u003eaddr_idx = 0;\n+\t\terr = rtnl_dump_mcaddr_dev(dev, skb, cb, \u0026ctx-\u003eaddr_idx, flags,\n+\t\t\t\t\t filter.netnsid);\n+\t\tif (err \u003c 0)\n+\t\t\tbreak;\n+\t}\n+out:\n+\trcu_read_unlock();\n+\tif (filter.netnsid \u003e= 0)\n+\t\tput_net_track(filter.tgt_net, \u0026filter.ns_tracker);\n+\treturn err;\n+}\n+\n struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,\n \t\t\t\t unsigned int change,\n \t\t\t\t u32 event, gfp_t flags, int *new_nsid,\n@@ -7256,6 +7428,8 @@ static const struct rtnl_msg_handler rtnetlink_rtnl_msg_handlers[] __initconst =\n \t{.msgtype = RTM_SETSTATS, .doit = rtnl_stats_set},\n \t{.msgtype = RTM_NEWLINKPROP, .doit = rtnl_newlinkprop},\n \t{.msgtype = RTM_DELLINKPROP, .doit = rtnl_dellinkprop},\n+\t{.protocol = PF_PACKET, .msgtype = RTM_GETMULTICAST,\n+\t .dumpit = rtnl_dump_mcaddr, .flags = RTNL_FLAG_DUMP_UNLOCKED},\n \t{.protocol = PF_BRIDGE, .msgtype = RTM_GETLINK,\n \t .dumpit = rtnl_bridge_getlink},\n \t{.protocol = PF_BRIDGE, .msgtype = RTM_DELLINK,\ndiff --git a/tools/testing/selftests/net/rtnetlink.py b/tools/testing/selftests/net/rtnetlink.py\nindex 5cc3ebdcf08de..d69d375a2deff 100755\n--- a/tools/testing/selftests/net/rtnetlink.py\n+++ b/tools/testing/selftests/net/rtnetlink.py\n@@ -1,17 +1,21 @@\n #!/usr/bin/env python3\n # SPDX-License-Identifier: GPL-2.0\n \n+import errno\n import socket\n import struct\n import time\n from lib.py import bkg, ip, ksft_exit, ksft_run, ksft_eq, ksft_ge, ksft_true, KsftSkipEx\n-from lib.py import ksft_not_in, ksft_not_none\n-from lib.py import CmdExitFailure, NetNS, NetNSEnter, RtnlAddrFamily, RtnlRouteFamily\n+from lib.py import ksft_in, ksft_not_in, ksft_not_none\n+from lib.py import CmdExitFailure, NetNS, NetNSEnter, NlError, RtnlAddrFamily, RtnlRouteFamily\n from lib.py import defer\n \n IPV4_ALL_HOSTS_MULTICAST = b'\\xe0\\x00\\x00\\x01'\n IPV4_TEST_MULTICAST = b'\\xef\\x01\\x01\\x01'\n IPV6_TEST_MULTICAST = bytes.fromhex('ff020000000000000000000000000123')\n+ETH_ALL_HOSTS_MULTICAST = bytes.fromhex('01005e000001')\n+ETH_TEST_MULTICAST_STR = '01:00:5e:01:01:01'\n+ETH_TEST_MULTICAST = bytes.fromhex(ETH_TEST_MULTICAST_STR.replace(':', ''))\n \n \n def _users_for(rtnl: RtnlAddrFamily, family: int, grp: bytes, ifindex: int):\n@@ -105,6 +109,70 @@ def dump_mcaddr6_check() -\u003e None:\n s2.close()\n \n \n+def dump_mcaddr_l2_check() -\u003e None:\n+ \"\"\"\n+ Verify link-layer multicast addresses in an AF_PACKET RTM_GETMULTICAST\n+ dump: the ifa-index filter, mc-users, the global flag and\n+ target-netnsid.\n+ \"\"\"\n+\n+ with NetNS() as ns, NetNSEnter(str(ns)):\n+ for ifname in (\"dummy1\", \"dummy2\"):\n+ ip(f\"link add name {ifname} type dummy\")\n+ ip(f\"link set {ifname} up\")\n+ dev_idx = socket.if_nametoindex(\"dummy1\")\n+ ip(f\"maddr add {ETH_TEST_MULTICAST_STR} dev dummy1\")\n+\n+ rtnl = RtnlAddrFamily()\n+ defer(rtnl.close)\n+ try:\n+ addresses = rtnl.getmulticast(\n+ {\"ifa-family\": socket.AF_PACKET, \"ifa-index\": dev_idx},\n+ dump=True)\n+ except NlError as e:\n+ if e.error == errno.EOPNOTSUPP:\n+ raise KsftSkipEx(\n+ \"kernel does not support AF_PACKET multicast dump\")\n+ raise\n+\n+ # dummy2 has entries as well, only dummy1 may be listed\n+ ksft_eq({addr['ifa-index'] for addr in addresses}, {dev_idx},\n+ \"AF_PACKET multicast dump ignored ifa-index filter\")\n+\n+ entries = {addr['multicast']: addr for addr in addresses}\n+\n+ # Bringing an Ethernet device up joins 224.0.0.1, which maps\n+ # to 01:00:5e:00:00:01 in the device multicast list.\n+ all_hosts = entries.get(ETH_ALL_HOSTS_MULTICAST)\n+ ksft_not_none(all_hosts,\n+ \"dummy1 does not have the all-hosts link-layer address\")\n+ if all_hosts is not None:\n+ ksft_not_in('global', all_hosts['flags'],\n+ \"protocol entry is global\")\n+\n+ static = entries.get(ETH_TEST_MULTICAST)\n+ ksft_not_none(static, \"dummy1 does not have the SIOCADDMULTI address\")\n+ if static is not None:\n+ ksft_eq(static['mc-users'], 1,\n+ \"unexpected mc-users for the SIOCADDMULTI address\")\n+ ksft_in('global', static['flags'],\n+ \"SIOCADDMULTI entry is not global\")\n+\n+ # target-netnsid dumps another netns, ifa-index is relative to it\n+ with NetNS() as peer:\n+ ip(f\"netns set {peer} 5\")\n+ ip(\"link add name dummy3 type dummy\", ns=peer)\n+ ip(\"link set dummy3 up\", ns=peer)\n+ peer_idx = ip(\"link show dummy3\", json=True, ns=peer)[0]['ifindex']\n+\n+ addresses = rtnl.getmulticast(\n+ {\"ifa-family\": socket.AF_PACKET, \"target-netnsid\": 5,\n+ \"ifa-index\": peer_idx}, dump=True)\n+ ksft_eq({(addr['ifa-index'], addr['target-netnsid'])\n+ for addr in addresses}, {(peer_idx, 5)},\n+ \"target-netnsid did not dump the peer netns\")\n+\n+\n def ipv4_devconf_notify() -\u003e None:\n \"\"\"\n Configure an interface and set ipv4-devconf values through netlink\n@@ -315,7 +383,8 @@ def ipv6_route_del_reason_absent() -\u003e None:\n \n \n def main() -\u003e None:\n- ksft_run([dump_mcaddr_check, dump_mcaddr6_check, ipv4_devconf_notify,\n+ ksft_run([dump_mcaddr_check, dump_mcaddr6_check, dump_mcaddr_l2_check,\n+ ipv4_devconf_notify,\n ipv6_route_del_reason_expired,\n ipv6_route_del_reason_ra_withdrawn,\n ipv6_route_del_reason_absent])\n"
} |
| 2/1 | 2026/09/14 02:39 | agent | patch-evaluator |
1mModel:core Args: null Results: {
"EnableConfigs": [
"NET",
"NET_NS"
],
"FocusSymbols": [
"rtnl_dump_mcaddr",
"rtnl_dump_mcaddr_dev",
"rtnl_fill_mcaddr",
"rtnl_valid_dump_mcaddr_req"
],
"Reasoning": "The patch adds support for dumping link-layer multicast addresses via rtnetlink (RTM_GETMULTICAST with protocol/family AF_PACKET) in net/core/rtnetlink.c. This introduces new parsing, validation, device iteration under RCU and netif_addr_lock_bh, network namespace tracking, and netlink message formatting. The code is in the core networking subsystem and directly accessible from userspace over NETLINK_ROUTE sockets in standard virtualized environments.",
"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 c4f5c94bdbc1fa681f251ed4e4efc6e0cdfe08dd
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Sep 14 02:39:01 2026 +0000
syz-cluster: applied patch under review
diff --git a/Documentation/netlink/specs/rt-addr.yaml b/Documentation/netlink/specs/rt-addr.yaml
index 0ecbd24c890c6..1a17e55d1cca0 100644
--- a/Documentation/netlink/specs/rt-addr.yaml
+++ b/Documentation/netlink/specs/rt-addr.yaml
@@ -77,6 +77,8 @@ definitions:
name: mcautojoin
-
name: stable-privacy
+ -
+ name: global
attribute-sets:
-
@@ -119,7 +121,7 @@ attribute-sets:
type: u32
-
name: target-netnsid
- type: binary
+ type: s32
-
name: proto
type: u8
@@ -168,7 +170,13 @@ operations:
attributes: *ifaddr-all
-
name: getmulticast
- doc: Get / dump IPv4/IPv6 multicast addresses.
+ doc: |
+ Get / dump multicast addresses. ifa-family must select the address
+ family: AF_INET or AF_INET6 for the IP multicast groups joined on
+ a device, AF_PACKET for the link-layer multicast addresses in the
+ device filter. Link-layer entries added explicitly, e.g. with
+ SIOCADDMULTI or "bridge fdb add ... self", rather than by a
+ protocol join are reported with the global flag set.
attribute-set: addr-attrs
fixed-header: ifaddrmsg
do:
@@ -181,10 +189,13 @@ operations:
- multicast
- mc-users
- cacheinfo
+ - flags
+ - target-netnsid
dump:
request:
value: 58
- attributes: []
+ attributes:
+ - target-netnsid
reply:
value: 58
attributes: *mcaddr-attrs
diff --git a/include/uapi/linux/if_addr.h b/include/uapi/linux/if_addr.h
index 7fb630b7fe311..0a1ad9ebb47be 100644
--- a/include/uapi/linux/if_addr.h
+++ b/include/uapi/linux/if_addr.h
@@ -57,6 +57,7 @@ enum {
#define IFA_F_NOPREFIXROUTE 0x200
#define IFA_F_MCAUTOJOIN 0x400
#define IFA_F_STABLE_PRIVACY 0x800
+#define IFA_F_GLOBAL 0x1000
struct ifa_cacheinfo {
__u32 ifa_prefered;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index be9d1625bac31..5f3e692a828b8 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4571,6 +4571,178 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len ? : ret;
}
+static int rtnl_fill_mcaddr(struct sk_buff *skb, const struct net_device *dev,
+ const struct netdev_hw_addr *ha, u32 portid,
+ u32 seq, unsigned int flags, int netnsid)
+{
+ u32 ifa_flags = ha->global_use ? IFA_F_GLOBAL : 0;
+ struct ifaddrmsg *ifm;
+ struct nlmsghdr *nlh;
+
+ nlh = nlmsg_put(skb, portid, seq, RTM_GETMULTICAST, sizeof(*ifm),
+ flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ ifm = nlmsg_data(nlh);
+ ifm->ifa_family = AF_PACKET;
+ ifm->ifa_prefixlen = 0;
+ /* ifm->ifa_flags holds 8 bits, the full value is in IFA_FLAGS */
+ ifm->ifa_flags = (__u8)ifa_flags;
+ ifm->ifa_scope = RT_SCOPE_LINK;
+ ifm->ifa_index = dev->ifindex;
+
+ if ((netnsid >= 0 &&
+ nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)) ||
+ nla_put(skb, IFA_MULTICAST, dev->addr_len, ha->addr) ||
+ nla_put_u32(skb, IFA_MC_USERS, ha->refcount) ||
+ nla_put_u32(skb, IFA_FLAGS, ifa_flags)) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int rtnl_dump_mcaddr_dev(struct net_device *dev, struct sk_buff *skb,
+ struct netlink_callback *cb, int *s_addr_idx,
+ unsigned int flags, int netnsid)
+{
+ struct netdev_hw_addr *ha;
+ int addr_idx = 0;
+ int err = 0;
+
+ netif_addr_lock_bh(dev);
+ netdev_for_each_mc_addr(ha, dev) {
+ if (addr_idx < *s_addr_idx) {
+ addr_idx++;
+ continue;
+ }
+ err = rtnl_fill_mcaddr(skb, dev, ha, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, flags, netnsid);
+ if (err < 0)
+ break;
+ addr_idx++;
+ }
+ netif_addr_unlock_bh(dev);
+
+ *s_addr_idx = err < 0 ? addr_idx : 0;
+
+ return err;
+}
+
+struct rtnl_mcaddr_dump_filter {
+ struct net *tgt_net;
+ netns_tracker ns_tracker;
+ int netnsid;
+ int ifindex;
+};
+
+static const struct nla_policy rtnl_mcaddr_dump_policy[IFA_MAX + 1] = {
+ [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
+};
+
+static int rtnl_valid_dump_mcaddr_req(const struct nlmsghdr *nlh,
+ struct sock *sk,
+ struct rtnl_mcaddr_dump_filter *filter,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[IFA_MAX + 1];
+ struct ifaddrmsg *ifm;
+ int err;
+
+ ifm = nlmsg_payload(nlh, sizeof(*ifm));
+ if (!ifm) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid header for multicast dump request");
+ return -EINVAL;
+ }
+
+ if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid values in multicast dump header");
+ return -EINVAL;
+ }
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,
+ rtnl_mcaddr_dump_policy, extack);
+ if (err < 0)
+ return err;
+
+ if (tb[IFA_TARGET_NETNSID]) {
+ struct net *net;
+
+ filter->netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
+ net = rtnl_get_net_ns_capable(sk, filter->netnsid);
+ if (IS_ERR(net)) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid target network namespace id");
+ return PTR_ERR(net);
+ }
+ netns_tracker_alloc(net, &filter->ns_tracker, GFP_KERNEL);
+ filter->tgt_net = net;
+ }
+
+ filter->ifindex = ifm->ifa_index;
+
+ return 0;
+}
+
+static int rtnl_dump_mcaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct rtnl_mcaddr_dump_filter filter = {
+ .tgt_net = sock_net(skb->sk),
+ .netnsid = -1,
+ };
+ unsigned int flags = NLM_F_MULTI;
+ struct {
+ unsigned long ifindex;
+ int addr_idx;
+ } *ctx = (void *)cb->ctx;
+ unsigned long s_ifindex;
+ struct net_device *dev;
+ int err;
+
+ err = rtnl_valid_dump_mcaddr_req(cb->nlh, skb->sk, &filter,
+ cb->extack);
+ if (err < 0)
+ return err;
+
+ rcu_read_lock();
+
+ if (filter.ifindex) {
+ cb->answer_flags |= NLM_F_DUMP_FILTERED;
+ flags |= NLM_F_DUMP_FILTERED;
+ dev = dev_get_by_index_rcu(filter.tgt_net, filter.ifindex);
+ if (!dev) {
+ err = -ENODEV;
+ goto out;
+ }
+ err = rtnl_dump_mcaddr_dev(dev, skb, cb, &ctx->addr_idx, flags,
+ filter.netnsid);
+ goto out;
+ }
+
+ s_ifindex = ctx->ifindex;
+ for_each_netdev_dump(filter.tgt_net, dev, ctx->ifindex) {
+ /* The device the dump stopped at is gone, do not skip
+ * entries of the next one.
+ */
+ if (dev->ifindex != s_ifindex)
+ ctx->addr_idx = 0;
+ err = rtnl_dump_mcaddr_dev(dev, skb, cb, &ctx->addr_idx, flags,
+ filter.netnsid);
+ if (err < 0)
+ break;
+ }
+out:
+ rcu_read_unlock();
+ if (filter.netnsid >= 0)
+ put_net_track(filter.tgt_net, &filter.ns_tracker);
+ return err;
+}
+
struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
unsigned int change,
u32 event, gfp_t flags, int *new_nsid,
@@ -7256,6 +7428,8 @@ static const struct rtnl_msg_handler rtnetlink_rtnl_msg_handlers[] __initconst =
{.msgtype = RTM_SETSTATS, .doit = rtnl_stats_set},
{.msgtype = RTM_NEWLINKPROP, .doit = rtnl_newlinkprop},
{.msgtype = RTM_DELLINKPROP, .doit = rtnl_dellinkprop},
+ {.protocol = PF_PACKET, .msgtype = RTM_GETMULTICAST,
+ .dumpit = rtnl_dump_mcaddr, .flags = RTNL_FLAG_DUMP_UNLOCKED},
{.protocol = PF_BRIDGE, .msgtype = RTM_GETLINK,
.dumpit = rtnl_bridge_getlink},
{.protocol = PF_BRIDGE, .msgtype = RTM_DELLINK,
diff --git a/tools/testing/selftests/net/rtnetlink.py b/tools/testing/selftests/net/rtnetlink.py
index 5cc3ebdcf08de..d69d375a2deff 100755
--- a/tools/testing/selftests/net/rtnetlink.py
+++ b/tools/testing/selftests/net/rtnetlink.py
@@ -1,17 +1,21 @@
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
+import errno
import socket
import struct
import time
from lib.py import bkg, ip, ksft_exit, ksft_run, ksft_eq, ksft_ge, ksft_true, KsftSkipEx
-from lib.py import ksft_not_in, ksft_not_none
-from lib.py import CmdExitFailure, NetNS, NetNSEnter, RtnlAddrFamily, RtnlRouteFamily
+from lib.py import ksft_in, ksft_not_in, ksft_not_none
+from lib.py import CmdExitFailure, NetNS, NetNSEnter, NlError, RtnlAddrFamily, RtnlRouteFamily
from lib.py import defer
IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01'
IPV4_TEST_MULTICAST = b'\xef\x01\x01\x01'
IPV6_TEST_MULTICAST = bytes.fromhex('ff020000000000000000000000000123')
+ETH_ALL_HOSTS_MULTICAST = bytes.fromhex('01005e000001')
+ETH_TEST_MULTICAST_STR = '01:00:5e:01:01:01'
+ETH_TEST_MULTICAST = bytes.fromhex(ETH_TEST_MULTICAST_STR.replace(':', ''))
def _users_for(rtnl: RtnlAddrFamily, family: int, grp: bytes, ifindex: int):
@@ -105,6 +109,70 @@ def dump_mcaddr6_check() -> None:
s2.close()
+def dump_mcaddr_l2_check() -> None:
+ """
+ Verify link-layer multicast addresses in an AF_PACKET RTM_GETMULTICAST
+ dump: the ifa-index filter, mc-users, the global flag and
+ target-netnsid.
+ """
+
+ with NetNS() as ns, NetNSEnter(str(ns)):
+ for ifname in ("dummy1", "dummy2"):
+ ip(f"link add name {ifname} type dummy")
+ ip(f"link set {ifname} up")
+ dev_idx = socket.if_nametoindex("dummy1")
+ ip(f"maddr add {ETH_TEST_MULTICAST_STR} dev dummy1")
+
+ rtnl = RtnlAddrFamily()
+ defer(rtnl.close)
+ try:
+ addresses = rtnl.getmulticast(
+ {"ifa-family": socket.AF_PACKET, "ifa-index": dev_idx},
+ dump=True)
+ except NlError as e:
+ if e.error == errno.EOPNOTSUPP:
+ raise KsftSkipEx(
+ "kernel does not support AF_PACKET multicast dump")
+ raise
+
+ # dummy2 has entries as well, only dummy1 may be listed
+ ksft_eq({addr['ifa-index'] for addr in addresses}, {dev_idx},
+ "AF_PACKET multicast dump ignored ifa-index filter")
+
+ entries = {addr['multicast']: addr for addr in addresses}
+
+ # Bringing an Ethernet device up joins 224.0.0.1, which maps
+ # to 01:00:5e:00:00:01 in the device multicast list.
+ all_hosts = entries.get(ETH_ALL_HOSTS_MULTICAST)
+ ksft_not_none(all_hosts,
+ "dummy1 does not have the all-hosts link-layer address")
+ if all_hosts is not None:
+ ksft_not_in('global', all_hosts['flags'],
+ "protocol entry is global")
+
+ static = entries.get(ETH_TEST_MULTICAST)
+ ksft_not_none(static, "dummy1 does not have the SIOCADDMULTI address")
+ if static is not None:
+ ksft_eq(static['mc-users'], 1,
+ "unexpected mc-users for the SIOCADDMULTI address")
+ ksft_in('global', static['flags'],
+ "SIOCADDMULTI entry is not global")
+
+ # target-netnsid dumps another netns, ifa-index is relative to it
+ with NetNS() as peer:
+ ip(f"netns set {peer} 5")
+ ip("link add name dummy3 type dummy", ns=peer)
+ ip("link set dummy3 up", ns=peer)
+ peer_idx = ip("link show dummy3", json=True, ns=peer)[0]['ifindex']
+
+ addresses = rtnl.getmulticast(
+ {"ifa-family": socket.AF_PACKET, "target-netnsid": 5,
+ "ifa-index": peer_idx}, dump=True)
+ ksft_eq({(addr['ifa-index'], addr['target-netnsid'])
+ for addr in addresses}, {(peer_idx, 5)},
+ "target-netnsid did not dump the peer netns")
+
+
def ipv4_devconf_notify() -> None:
"""
Configure an interface and set ipv4-devconf values through netlink
@@ -315,7 +383,8 @@ def ipv6_route_del_reason_absent() -> None:
def main() -> None:
- ksft_run([dump_mcaddr_check, dump_mcaddr6_check, ipv4_devconf_notify,
+ ksft_run([dump_mcaddr_check, dump_mcaddr6_check, dump_mcaddr_l2_check,
+ ipv4_devconf_notify,
ipv6_route_del_reason_expired,
ipv6_route_del_reason_ra_withdrawn,
ipv6_route_del_reason_absent])
|
| 3/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7415 output: 29 thoughts: 681 Thoughts: **WorthFuzzing=true - rtnetlink multicast address dump**
Okay, I see the task: evaluate this patch series. It looks like it's been applied as a HEAD commit, so let's dig in. It touches several files: `Documentation/netlink/specs/rt-addr.yaml`, `include/uapi/linux/if_addr.h`, `net/core/rtnetlink.c`, and `tools/testing/selftests/net/rtnetlink.py`. The meat of this change is clearly in `net/core/rtnetlink.c`.
Aha! This patch implements the dumping of link-layer multicast addresses via rtnetlink, specifically `RTM_GETMULTICAST` with protocol `PF_PACKET`. I see the addition of `rtnl_fill_mcaddr`, `rtnl_dump_mcaddr_dev`, associated data structures and a handler registration: `{.protocol = PF_PACKET, .msgtype = RTM_GETMULTICAST, .dumpit = rtnl_dump_mcaddr, .flags = RTNL_FLAG_DUMP_UNLOCKED}`.
This is significant. It's executable code in the core networking stack, meaning it's reachable via standard rtnetlink netlink socket operations. We're talking about `RTM_GETMULTICAST` with `PF_PACKET`/`AF_PACKET` – standard stuff. This is excellent for fuzzing because netlink sockets and rtnetlink are readily available in environments like QEMU and GCE, which are heavily leveraged by syzkaller.
Now, let's apply the "WorthFuzzing=true" criteria. The provided guidelines state that we should return `WorthFuzzing=true` whenever the patch touches reachable executable code. This includes modifications in core subsystems like core networking. This certainly fits. This is new functionality in the core rtnetlink path and therefore clearly qualifies.
The next step is to nail down the configuration requirements. To enable this code, I need to figure out the required kernel config options. I'll check `net/core/Makefile` or use `grepper` to see what enables `rtnetlink.c`, and specifically this `PF_PACKET` multicast functionality. Once I have the configuration requirements, I can confidently say this is definitely a `WorthFuzzing=true` candidate.
|
| 4/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "rtnetlink\\.o",
"PathPrefix": "net/core/"
}Results: {
"Output": "net/core/Makefile=12=obj-y\t\t += dev.o dev_api.o dev_addr_lists.o dst.o netevent.o \\\nnet/core/Makefile:13:\t\t\tneighbour.o rtnetlink.o utils.o link_watch.o filter.o \\\nnet/core/Makefile-14-\t\t\tsock_diag.o dev_ioctl.o tso.o sock_reuseport.o \\\n"
} |
| 5/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8752 output: 25 thoughts: 53 Thoughts: **Examining the Kernel Network Configuration** Okay, so `rtnetlink.o` is definitely compiled in when `CONFIG_NET` is enabled, that much is clear from the build system. Now, I need to figure out the exact inclusion path. Since it seems pretty fundamental to the networking stack, my hunch is that it's going to be brought in via `net/core/Makefile`, or maybe directly from a higher-level `net/Makefile`. Right, let's start by checking if `net/core/Makefile` is included by `net/Makefile`. If that doesn't hold the answer, I'll need to dig into the `net/Makefile` to see how everything gets pulled together. |
| 6/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "core/",
"PathPrefix": "net/Makefile"
}Results: {
"Output": "net/Makefile-8-\nnet/Makefile:9:obj-y\t\t\t\t:= devres.o socket.o core/\nnet/Makefile-10-\n"
} |
| 7/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9029 output: 32 thoughts: 139 Thoughts: **Examining the Core Network Configuration** Okay, so `CONFIG_NET` is the big one, the central configuration item. But hold on, what about `NETDEVICES`? `NET` is usually the more standard approach, right? I'm getting a little ahead of myself though. Is `CONFIG_NET` truly enough? I need to be sure. Let's delve into some related functions. I'll need to check the dependencies of `rtnl_mcaddr_dump_policy`, and then `netdev_for_each_mc_addr`, then also look at `dev_get_by_index_rcu`, `rtnl_get_net_ns_capable`, and `netns_tracker_alloc` to be certain. Ah, wait a second, doesn't `rtnl_get_net_ns_capable` have a dependency on `CONFIG_NET_NS`? This is something I have to make absolutely sure of. Let me dive into that function and check it. |
| 8/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "rtnl_get_net_ns_capable",
"PathPrefix": "net/"
}Results: {
"Output": "net/core/net_namespace.c=1000=static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/core/net_namespace.c-1042-\nnet/core/net_namespace.c:1043:\t\ttarget = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, id);\nnet/core/net_namespace.c-1044-\t\tif (IS_ERR(target)) {\n--\nnet/core/net_namespace.c=1108=static int rtnl_valid_dump_net_req(const struct nlmsghdr *nlh, struct sock *sk,\n--\nnet/core/net_namespace.c-1128-\nnet/core/net_namespace.c:1129:\t\t\tnet = rtnl_get_net_ns_capable(sk, nla_get_s32(tb[i]));\nnet/core/net_namespace.c-1130-\t\t\tif (IS_ERR(net)) {\n--\nnet/core/rtnetlink.c=2459=static bool link_dump_filtered(struct net_device *dev,\n--\nnet/core/rtnetlink.c-2470-/**\nnet/core/rtnetlink.c:2471: * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.\nnet/core/rtnetlink.c-2472- * @sk: netlink socket\n--\nnet/core/rtnetlink.c-2477- */\nnet/core/rtnetlink.c:2478:struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)\nnet/core/rtnetlink.c-2479-{\n--\nnet/core/rtnetlink.c-2494-}\nnet/core/rtnetlink.c:2495:EXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);\nnet/core/rtnetlink.c-2496-\n--\nnet/core/rtnetlink.c=2549=static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/core/rtnetlink.c-2584-\t\t\tnetnsid = nla_get_s32(tb[i]);\nnet/core/rtnetlink.c:2585:\t\t\ttgt_net = rtnl_get_net_ns_capable(skb-\u003esk, netnsid);\nnet/core/rtnetlink.c-2586-\t\t\tif (IS_ERR(tgt_net)) {\n--\nnet/core/rtnetlink.c=3663=static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/core/rtnetlink.c-3685-\t\tnetnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);\nnet/core/rtnetlink.c:3686:\t\ttgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);\nnet/core/rtnetlink.c-3687-\t\tif (IS_ERR(tgt_net))\n--\nnet/core/rtnetlink.c=4281=static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,\n--\nnet/core/rtnetlink.c-4305-\t\tnetnsid = nla_get_s32(tb[IFLA_TARGET_NETNSID]);\nnet/core/rtnetlink.c:4306:\t\ttgt_net = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, netnsid);\nnet/core/rtnetlink.c-4307-\t\tif (IS_ERR(tgt_net))\n--\nnet/core/rtnetlink.c=4646=static int rtnl_valid_dump_mcaddr_req(const struct nlmsghdr *nlh,\n--\nnet/core/rtnetlink.c-4676-\t\tfilter-\u003enetnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);\nnet/core/rtnetlink.c:4677:\t\tnet = rtnl_get_net_ns_capable(sk, filter-\u003enetnsid);\nnet/core/rtnetlink.c-4678-\t\tif (IS_ERR(net)) {\n--\nnet/ipv4/devinet.c=1786=static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,\n--\nnet/ipv4/devinet.c-1826-\nnet/ipv4/devinet.c:1827:\t\t\tnet = rtnl_get_net_ns_capable(sk, fillargs-\u003enetnsid);\nnet/ipv4/devinet.c-1828-\t\t\tif (IS_ERR(net)) {\n--\nnet/ipv6/addrconf.c=5380=static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,\n--\nnet/ipv6/addrconf.c-5419-\t\t\tfillargs-\u003enetnsid = nla_get_s32(tb[i]);\nnet/ipv6/addrconf.c:5420:\t\t\tnet = rtnl_get_net_ns_capable(sk, fillargs-\u003enetnsid);\nnet/ipv6/addrconf.c-5421-\t\t\tif (IS_ERR(net)) {\n--\nnet/ipv6/addrconf.c=5566=static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,\n--\nnet/ipv6/addrconf.c-5592-\nnet/ipv6/addrconf.c:5593:\t\ttgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,\nnet/ipv6/addrconf.c-5594-\t\t\t\t\t\t fillargs.netnsid);\n--\nnet/wireless/nl80211.c=14344=static int nl80211_wiphy_netns(struct sk_buff *skb, struct genl_info *info)\n--\nnet/wireless/nl80211.c-14367-\t * (enforced by GENL_UNS_ADMIN_PERM on the genl op). Mirror the\nnet/wireless/nl80211.c:14368:\t * convention used by net/core/rtnetlink.c::rtnl_get_net_ns_capable()\nnet/wireless/nl80211.c-14369-\t * and require CAP_NET_ADMIN over the target netns as well, so that\n"
} |
| 9/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11154 output: 38 thoughts: 31 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience and written in the first person: **Investigating `rtnl_get_net_ns_capable`** Okay, so I'm diving into the `rtnl_get_net_ns_capable` function. My initial thought is to check its definition within `net/core/rtnetlink.c`. I need to understand its behavior and purpose in the context of network namespaces. Specifically, I'm trying to pin down the criteria it uses to determine capability, likely related to network namespace access control. I'm assuming that this function's logic is probably crucial for secure netlink operations, so knowing exactly how it works is vital for me at this point. Time to examine the source code... Let's see what's actually in there! |
| 10/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/core/rtnetlink.c",
"FirstLine": 2470,
"LineCount": 30
}Results: {
"Contents": "2470:\t/**\n2471:\t * rtnl_get_net_ns_capable - Get netns if sufficiently privileged.\n2472:\t * @sk: netlink socket\n2473:\t * @netnsid: network namespace identifier\n2474:\t *\n2475:\t * Returns the network namespace identified by netnsid on success or an error\n2476:\t * pointer on failure.\n2477:\t */\n2478:\tstruct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid)\n2479:\t{\n2480:\t\tstruct net *net;\n2481:\t\n2482:\t\tnet = get_net_ns_by_id(sock_net(sk), netnsid);\n2483:\t\tif (!net)\n2484:\t\t\treturn ERR_PTR(-EINVAL);\n2485:\t\n2486:\t\t/* For now, the caller is required to have CAP_NET_ADMIN in\n2487:\t\t * the user namespace owning the target net ns.\n2488:\t\t */\n2489:\t\tif (!sk_ns_capable(sk, net-\u003euser_ns, CAP_NET_ADMIN)) {\n2490:\t\t\tput_net(net);\n2491:\t\t\treturn ERR_PTR(-EACCES);\n2492:\t\t}\n2493:\t\treturn net;\n2494:\t}\n2495:\tEXPORT_SYMBOL_GPL(rtnl_get_net_ns_capable);\n2496:\t\n2497:\tbool rtnl_dev_link_net_capable(const struct net_device *dev,\n2498:\t\t\t\t const struct net *link_net)\n2499:\t{\n"
} |
| 11/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11862 output: 38 thoughts: 123 Thoughts: **Analyzing the Kernel's rtnetlink Implementation** Okay, so I'm looking into `rtnetlink.c`, which, as expected, is always compiled in conjunction with `CONFIG_NET`. I should keep in mind that `CONFIG_NET_NS` comes into play for namespacing tests, especially if `IFA_TARGET_NETNSID` is used, but the fundamental dependency is definitely `NET`. Now, the important task is to see if there are any conditional compilations related to `rtnl_dump_mcaddr` or within that file, specifically in `net/core/rtnetlink.c`, as that is where this particular patch is located. I should start by carefully examining lines 4570 through 4750 of `net/core/rtnetlink.c`. |
| 12/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/core/rtnetlink.c",
"FirstLine": 4565,
"LineCount": 40
}Results: {
"Contents": "4565:\t\t\tret = dumpit(skb, cb);\n4566:\t\t\tif (ret)\n4567:\t\t\t\tbreak;\n4568:\t\t}\n4569:\t\tcb-\u003efamily = idx;\n4570:\t\n4571:\t\treturn skb-\u003elen ? : ret;\n4572:\t}\n4573:\t\n4574:\tstatic int rtnl_fill_mcaddr(struct sk_buff *skb, const struct net_device *dev,\n4575:\t\t\t\t const struct netdev_hw_addr *ha, u32 portid,\n4576:\t\t\t\t u32 seq, unsigned int flags, int netnsid)\n4577:\t{\n4578:\t\tu32 ifa_flags = ha-\u003eglobal_use ? IFA_F_GLOBAL : 0;\n4579:\t\tstruct ifaddrmsg *ifm;\n4580:\t\tstruct nlmsghdr *nlh;\n4581:\t\n4582:\t\tnlh = nlmsg_put(skb, portid, seq, RTM_GETMULTICAST, sizeof(*ifm),\n4583:\t\t\t\tflags);\n4584:\t\tif (!nlh)\n4585:\t\t\treturn -EMSGSIZE;\n4586:\t\n4587:\t\tifm = nlmsg_data(nlh);\n4588:\t\tifm-\u003eifa_family = AF_PACKET;\n4589:\t\tifm-\u003eifa_prefixlen = 0;\n4590:\t\t/* ifm-\u003eifa_flags holds 8 bits, the full value is in IFA_FLAGS */\n4591:\t\tifm-\u003eifa_flags = (__u8)ifa_flags;\n4592:\t\tifm-\u003eifa_scope = RT_SCOPE_LINK;\n4593:\t\tifm-\u003eifa_index = dev-\u003eifindex;\n4594:\t\n4595:\t\tif ((netnsid \u003e= 0 \u0026\u0026\n4596:\t\t nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)) ||\n4597:\t\t nla_put(skb, IFA_MULTICAST, dev-\u003eaddr_len, ha-\u003eaddr) ||\n4598:\t\t nla_put_u32(skb, IFA_MC_USERS, ha-\u003erefcount) ||\n4599:\t\t nla_put_u32(skb, IFA_FLAGS, ifa_flags)) {\n4600:\t\t\tnlmsg_cancel(skb, nlh);\n4601:\t\t\treturn -EMSGSIZE;\n4602:\t\t}\n4603:\t\n4604:\t\tnlmsg_end(skb, nlh);\n"
} |
| 13/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12898 output: 38 thoughts: 28 Thoughts: Okay, here's my attempt at summarizing those lines as though they were my thoughts, aimed at an expert audience, and starting with a bolded header: **Diving into rtnetlink.c: A Quick Code Review** Alright, time to get my hands dirty. Let's see what's happening between lines 4605 and 4755 of `net/core/rtnetlink.c`. I expect this to be a core section, likely dealing with message handling or some critical aspect of routing table operations given the context. I'm hoping to quickly identify the key functions or data structures being manipulated here. My focus will be on potential race conditions, locking mechanisms, and any areas that could introduce performance bottlenecks. I'll be looking for efficient use of memory and checking for any obvious inefficiencies. I need to understand this portion deeply, so I will analyze this section line-by-line. Any obvious optimizations or potential vulnerabilities will be noted. |
| 14/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/core/rtnetlink.c",
"FirstLine": 4605,
"LineCount": 80
}Results: {
"Contents": "4605:\t\treturn 0;\n4606:\t}\n4607:\t\n4608:\tstatic int rtnl_dump_mcaddr_dev(struct net_device *dev, struct sk_buff *skb,\n4609:\t\t\t\t\tstruct netlink_callback *cb, int *s_addr_idx,\n4610:\t\t\t\t\tunsigned int flags, int netnsid)\n4611:\t{\n4612:\t\tstruct netdev_hw_addr *ha;\n4613:\t\tint addr_idx = 0;\n4614:\t\tint err = 0;\n4615:\t\n4616:\t\tnetif_addr_lock_bh(dev);\n4617:\t\tnetdev_for_each_mc_addr(ha, dev) {\n4618:\t\t\tif (addr_idx \u003c *s_addr_idx) {\n4619:\t\t\t\taddr_idx++;\n4620:\t\t\t\tcontinue;\n4621:\t\t\t}\n4622:\t\t\terr = rtnl_fill_mcaddr(skb, dev, ha, NETLINK_CB(cb-\u003eskb).portid,\n4623:\t\t\t\t\t cb-\u003enlh-\u003enlmsg_seq, flags, netnsid);\n4624:\t\t\tif (err \u003c 0)\n4625:\t\t\t\tbreak;\n4626:\t\t\taddr_idx++;\n4627:\t\t}\n4628:\t\tnetif_addr_unlock_bh(dev);\n4629:\t\n4630:\t\t*s_addr_idx = err \u003c 0 ? addr_idx : 0;\n4631:\t\n4632:\t\treturn err;\n4633:\t}\n4634:\t\n4635:\tstruct rtnl_mcaddr_dump_filter {\n4636:\t\tstruct net *tgt_net;\n4637:\t\tnetns_tracker ns_tracker;\n4638:\t\tint netnsid;\n4639:\t\tint ifindex;\n4640:\t};\n4641:\t\n4642:\tstatic const struct nla_policy rtnl_mcaddr_dump_policy[IFA_MAX + 1] = {\n4643:\t\t[IFA_TARGET_NETNSID]\t= { .type = NLA_S32 },\n4644:\t};\n4645:\t\n4646:\tstatic int rtnl_valid_dump_mcaddr_req(const struct nlmsghdr *nlh,\n4647:\t\t\t\t\t struct sock *sk,\n4648:\t\t\t\t\t struct rtnl_mcaddr_dump_filter *filter,\n4649:\t\t\t\t\t struct netlink_ext_ack *extack)\n4650:\t{\n4651:\t\tstruct nlattr *tb[IFA_MAX + 1];\n4652:\t\tstruct ifaddrmsg *ifm;\n4653:\t\tint err;\n4654:\t\n4655:\t\tifm = nlmsg_payload(nlh, sizeof(*ifm));\n4656:\t\tif (!ifm) {\n4657:\t\t\tNL_SET_ERR_MSG(extack,\n4658:\t\t\t\t \"Invalid header for multicast dump request\");\n4659:\t\t\treturn -EINVAL;\n4660:\t\t}\n4661:\t\n4662:\t\tif (ifm-\u003eifa_prefixlen || ifm-\u003eifa_flags || ifm-\u003eifa_scope) {\n4663:\t\t\tNL_SET_ERR_MSG(extack,\n4664:\t\t\t\t \"Invalid values in multicast dump header\");\n4665:\t\t\treturn -EINVAL;\n4666:\t\t}\n4667:\t\n4668:\t\terr = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,\n4669:\t\t\t\t rtnl_mcaddr_dump_policy, extack);\n4670:\t\tif (err \u003c 0)\n4671:\t\t\treturn err;\n4672:\t\n4673:\t\tif (tb[IFA_TARGET_NETNSID]) {\n4674:\t\t\tstruct net *net;\n4675:\t\n4676:\t\t\tfilter-\u003enetnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);\n4677:\t\t\tnet = rtnl_get_net_ns_capable(sk, filter-\u003enetnsid);\n4678:\t\t\tif (IS_ERR(net)) {\n4679:\t\t\t\tNL_SET_ERR_MSG(extack,\n4680:\t\t\t\t\t \"Invalid target network namespace id\");\n4681:\t\t\t\treturn PTR_ERR(net);\n4682:\t\t\t}\n4683:\t\t\tnetns_tracker_alloc(net, \u0026filter-\u003ens_tracker, GFP_KERNEL);\n4684:\t\t\tfilter-\u003etgt_net = net;\n"
} |
| 15/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14408 output: 39 thoughts: 102 Thoughts: **Examining the RTNL Multicast Address Dump** Okay, let's dive into this `net/core/rtnetlink.c` code. Specifically, I want to re-examine line 7428 where the registration for `RTM_GETMULTICAST` with `PF_PACKET` is defined. The `dumpit` function, `rtnl_dump_mcaddr`, looks like the critical piece. I need to refresh my memory on that dump function and the associated flags, especially that `RTNL_FLAG_DUMP_UNLOCKED` flag, as I have been working with RTNL recently. To make sure I have all the context, I should also double-check the `rtnetlink_rtnl_msg_handlers` registration within `rtnetlink_init`. I need to ensure that the handler registration is correct and that I haven't missed anything obvious there. It is likely I will need to trace the call to `rtnl_dump_mcaddr` to be sure. |
| 16/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "rtnetlink_rtnl_msg_handlers",
"PathPrefix": "net/core/rtnetlink.c"
}Results: {
"Output": "net/core/rtnetlink.c=7406=static struct pernet_operations rtnetlink_net_ops = {\n--\nnet/core/rtnetlink.c-7410-\nnet/core/rtnetlink.c:7411:static const struct rtnl_msg_handler rtnetlink_rtnl_msg_handlers[] __initconst = {\nnet/core/rtnetlink.c-7412-\t{.msgtype = RTM_NEWLINK, .doit = rtnl_newlink,\n--\nnet/core/rtnetlink.c=7451=void __init rtnetlink_init(void)\n--\nnet/core/rtnetlink.c-7457-\nnet/core/rtnetlink.c:7458:\trtnl_register_many(rtnetlink_rtnl_msg_handlers);\nnet/core/rtnetlink.c-7459-\n"
} |
| 17/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 15004 output: 30 thoughts: 985 Thoughts: **Analyzing the Multicast Address Dump in RTNETLINK** Okay, let's break down this `rtnl_dump_mcaddr` function, specifically how it handles multicast address dumps over RTNETLINK. My primary concern is the handling of the network namespace tracking during potential multi-part dumps. First, I see the function `rtnetlink_init` registering its message handlers via `rtnl_register_many`. This is pretty standard. The fact that `rtnetlink_init` is called from `net_dev_init` gives it a good place to hook into the system. When a user program sends `RTM_GETMULTICAST` requests with `AF_PACKET` or `PF_PACKET`, it's routed here, which makes perfect sense. My immediate focus is inside `rtnl_dump_mcaddr`. I see the request is parsed, and importantly, `IFA_TARGET_NETNSID` is parsed, triggering `rtnl_get_net_ns_capable` and `netns_tracker_alloc`. That's a key point. Network namespace awareness is being established. It also uses `rcu_read_lock()`. The core logic iterates through the devices, either by a specific index if a filter is set, using `dev_get_by_index_rcu`, or over all of them using `for_each_netdev_dump`, both of which use RCU. Inside each device, it obtains a lock `netif_addr_lock_bh(dev)` and calls `netdev_for_each_mc_addr` to gather the necessary data. `rtnl_fill_mcaddr` constructs the netlink message with relevant attributes. Crucially, the lock is released with `netif_addr_unlock_bh(dev)`. The important point is that this lock is *acquired* while under the RCU read lock, which is good. `for_each_netdev_dump` is also done under RCU, which makes sense for concurrency. Now, the unlocked dump mode (`RTNL_FLAG_DUMP_UNLOCKED`) is interesting. It doesn't use the RTNL lock, but instead relies on RCU and `netif_addr_lock_bh`. This is a good performance optimization, but... Here’s where my expert instincts kick in: what happens with multiple dumps/split messages? We know the Netlink callback functions get called repeatedly as the buffer fills up. That has implications for how the network namespace is tracked. Specifically: `filter.tgt_net` and `filter.ns_tracker`. Looking at the function, if there's an error (e.g. `-EMSGSIZE`) from filling the buffer, the dump returns to `netlink_dump`. The important part: the `put_net_track` call *only* happens when the entire dump *completes*. That is, if `rtnl_dump_mcaddr` returns a positive value. If the function returns negative error, the function will be called again without a request header (when `cb->min_dump_alloc` or standard dump is used). This has to be handled carefully. Does other dump code handle this? I want to check similar code. I need to investigate how, for example, `inet_dump_ifaddr` or `rtnl_dump_ifinfo` manage `tgt_net` or `IFA_TARGET_NETNSID`. This is my next step. |
| 18/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "IFA_TARGET_NETNSID",
"PathPrefix": "net/"
}Results: {
"Output": "net/core/rtnetlink.c=4574=static int rtnl_fill_mcaddr(struct sk_buff *skb, const struct net_device *dev,\n--\nnet/core/rtnetlink.c-4595-\tif ((netnsid \u003e= 0 \u0026\u0026\nnet/core/rtnetlink.c:4596:\t nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)) ||\nnet/core/rtnetlink.c-4597-\t nla_put(skb, IFA_MULTICAST, dev-\u003eaddr_len, ha-\u003eaddr) ||\n--\nnet/core/rtnetlink.c=4642=static const struct nla_policy rtnl_mcaddr_dump_policy[IFA_MAX + 1] = {\nnet/core/rtnetlink.c:4643:\t[IFA_TARGET_NETNSID]\t= { .type = NLA_S32 },\nnet/core/rtnetlink.c-4644-};\n--\nnet/core/rtnetlink.c=4646=static int rtnl_valid_dump_mcaddr_req(const struct nlmsghdr *nlh,\n--\nnet/core/rtnetlink.c-4672-\nnet/core/rtnetlink.c:4673:\tif (tb[IFA_TARGET_NETNSID]) {\nnet/core/rtnetlink.c-4674-\t\tstruct net *net;\nnet/core/rtnetlink.c-4675-\nnet/core/rtnetlink.c:4676:\t\tfilter-\u003enetnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);\nnet/core/rtnetlink.c-4677-\t\tnet = rtnl_get_net_ns_capable(sk, filter-\u003enetnsid);\n--\nnet/ipv4/devinet.c=99=static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {\n--\nnet/ipv4/devinet.c-106-\t[IFA_RT_PRIORITY]\t= { .type = NLA_U32 },\nnet/ipv4/devinet.c:107:\t[IFA_TARGET_NETNSID]\t= { .type = NLA_S32 },\nnet/ipv4/devinet.c-108-\t[IFA_PROTO]\t\t= { .type = NLA_U8 },\n--\nnet/ipv4/devinet.c=1708=static int inet_fill_ifaddr(struct sk_buff *skb, const struct in_ifaddr *ifa,\n--\nnet/ipv4/devinet.c-1735-\tif (args-\u003enetnsid \u003e= 0 \u0026\u0026\nnet/ipv4/devinet.c:1736:\t nla_put_s32(skb, IFA_TARGET_NETNSID, args-\u003enetnsid))\nnet/ipv4/devinet.c-1737-\t\tgoto nla_put_failure;\n--\nnet/ipv4/devinet.c=1786=static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,\n--\nnet/ipv4/devinet.c-1821-\nnet/ipv4/devinet.c:1822:\t\tif (i == IFA_TARGET_NETNSID) {\nnet/ipv4/devinet.c-1823-\t\t\tstruct net *net;\n--\nnet/ipv6/addrconf.c=4804=static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {\n--\nnet/ipv6/addrconf.c-4809-\t[IFA_RT_PRIORITY]\t= { .len = sizeof(u32) },\nnet/ipv6/addrconf.c:4810:\t[IFA_TARGET_NETNSID]\t= { .type = NLA_S32 },\nnet/ipv6/addrconf.c-4811-\t[IFA_PROTO]\t\t= { .type = NLA_U8 },\n--\nnet/ipv6/addrconf.c=5170=static int inet6_fill_ifaddr(struct sk_buff *skb,\n--\nnet/ipv6/addrconf.c-5188-\tif (args-\u003enetnsid \u003e= 0 \u0026\u0026\nnet/ipv6/addrconf.c:5189:\t nla_put_s32(skb, IFA_TARGET_NETNSID, args-\u003enetnsid))\nnet/ipv6/addrconf.c-5190-\t\tgoto error;\n--\nnet/ipv6/addrconf.c=5248=int inet6_fill_ifmcaddr(struct sk_buff *skb,\n--\nnet/ipv6/addrconf.c-5265-\tif (args-\u003enetnsid \u003e= 0 \u0026\u0026\nnet/ipv6/addrconf.c:5266:\t nla_put_s32(skb, IFA_TARGET_NETNSID, args-\u003enetnsid)) {\nnet/ipv6/addrconf.c-5267-\t\tnlmsg_cancel(skb, nlh);\n--\nnet/ipv6/addrconf.c=5284=int inet6_fill_ifacaddr(struct sk_buff *skb,\n--\nnet/ipv6/addrconf.c-5301-\tif (args-\u003enetnsid \u003e= 0 \u0026\u0026\nnet/ipv6/addrconf.c:5302:\t nla_put_s32(skb, IFA_TARGET_NETNSID, args-\u003enetnsid)) {\nnet/ipv6/addrconf.c-5303-\t\tnlmsg_cancel(skb, nlh);\n--\nnet/ipv6/addrconf.c=5380=static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,\n--\nnet/ipv6/addrconf.c-5415-\nnet/ipv6/addrconf.c:5416:\t\tif (i == IFA_TARGET_NETNSID) {\nnet/ipv6/addrconf.c-5417-\t\t\tstruct net *net;\n--\nnet/ipv6/addrconf.c=5520=static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,\n--\nnet/ipv6/addrconf.c-5552-\t\tswitch (i) {\nnet/ipv6/addrconf.c:5553:\t\tcase IFA_TARGET_NETNSID:\nnet/ipv6/addrconf.c-5554-\t\tcase IFA_ADDRESS:\n--\nnet/ipv6/addrconf.c=5566=static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,\n--\nnet/ipv6/addrconf.c-5589-\nnet/ipv6/addrconf.c:5590:\tif (tb[IFA_TARGET_NETNSID]) {\nnet/ipv6/addrconf.c:5591:\t\tfillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);\nnet/ipv6/addrconf.c-5592-\n"
} |
| 19/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18604 output: 38 thoughts: 37 Thoughts: Here's my take on those functions, as if I were thinking it: **Diving into IPv4 Interface Address Dumping** Okay, so I need to refresh my memory on how the kernel dumps IPv4 interface addresses, right? Let's get down to brass tacks and dig into `inet_valid_dump_ifaddr_req` and `inet_dump_ifaddr` in `net/ipv4/devinet.c`. I know those are the likely suspects. `inet_valid_dump_ifaddr_req`, it's probably the check function, validating some sort of request structure, possibly ensuring that the dump request itself is kosher before we even bother trying to get the addresses. I'd wager it's handling things like buffer sizes, address families, perhaps even checking permissions or security contexts to make sure we're not dumping data we shouldn't. And I expect it'll return a negative error code if something's wrong, probably using one of those standard `netlink` or `errno` codes. Then, the main show: `inet_dump_ifaddr`. This one's the workhorse. This is where the magic happens. I expect it'll iterate through the interface address list, building a netlink message for each address it finds, populating fields like the IP address, prefix length, flags (like broadcast, secondary, etc.), and the interface index. Might be checking if a filter or request flag set by `inet_valid_dump_ifaddr_req` requires exclusion, exclusion is often done in the calling functions. It'll probably interact with the `in_device` structure or `inet_addr` structures or something like that, pulling the relevant data from the kernel's internal representation. Also, I'll bet it handles some kind of pagination or chunking, so it doesn't try to send a monolithic message. If things are done correctly, It'll send it back to the userspace process through netlink. Gotta make sure it's all efficient, minimal copying, avoid deadlocks. This is the core of how you get the IP address information from the kernel, so it’s something I need to fully understand. Time to crack open the source and see if my hunches are right. |
| 20/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/ipv4/devinet.c",
"FirstLine": 1820,
"LineCount": 40
}Results: {
"Contents": "1820:\t\t\t\tcontinue;\n1821:\t\n1822:\t\t\tif (i == IFA_TARGET_NETNSID) {\n1823:\t\t\t\tstruct net *net;\n1824:\t\n1825:\t\t\t\tfillargs-\u003enetnsid = nla_get_s32(tb[i]);\n1826:\t\n1827:\t\t\t\tnet = rtnl_get_net_ns_capable(sk, fillargs-\u003enetnsid);\n1828:\t\t\t\tif (IS_ERR(net)) {\n1829:\t\t\t\t\tfillargs-\u003enetnsid = -1;\n1830:\t\t\t\t\tNL_SET_ERR_MSG(extack, \"ipv4: Invalid target network namespace id\");\n1831:\t\t\t\t\treturn PTR_ERR(net);\n1832:\t\t\t\t}\n1833:\t\t\t\t*tgt_net = net;\n1834:\t\t\t} else {\n1835:\t\t\t\tNL_SET_ERR_MSG(extack, \"ipv4: Unsupported attribute in dump request\");\n1836:\t\t\t\treturn -EINVAL;\n1837:\t\t\t}\n1838:\t\t}\n1839:\t\n1840:\t\treturn 0;\n1841:\t}\n1842:\t\n1843:\tstatic int in_dev_dump_ifmcaddr(struct in_device *in_dev, struct sk_buff *skb,\n1844:\t\t\t\t\tstruct netlink_callback *cb, int *s_ip_idx,\n1845:\t\t\t\t\tstruct inet_fill_args *fillargs)\n1846:\t{\n1847:\t\tstruct ip_mc_list *im;\n1848:\t\tint ip_idx = 0;\n1849:\t\tint err;\n1850:\t\n1851:\t\tfor (im = rcu_dereference(in_dev-\u003emc_list);\n1852:\t\t im;\n1853:\t\t im = rcu_dereference(im-\u003enext_rcu)) {\n1854:\t\t\tif (ip_idx \u003c *s_ip_idx) {\n1855:\t\t\t\tip_idx++;\n1856:\t\t\t\tcontinue;\n1857:\t\t\t}\n1858:\t\t\terr = inet_fill_ifmcaddr(skb, in_dev-\u003edev, im, fillargs);\n1859:\t\t\tif (err \u003c 0)\n"
} |
| 21/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19767 output: 38 thoughts: 30 Thoughts: Okay, here's my take on those thoughts, framed as a first-person expert summary: **Digging into `in_dev_dump_ifmcaddr` Calls** Alright, time to dive in. My goal is to understand the context surrounding the `in_dev_dump_ifmcaddr` function. It looks like I need to trace its usage within the `net/ipv4/devinet.c` file. This is a common debugging step; knowing where a function is *called* is often more insightful than just looking at its definition. I'm hoping this will illuminate its purpose within the IPV4 network stack, especially regarding multicast interfaces. This will probably provide clues about multicast addresses, device binding and how information gets printed during certain states. Depending on where it is called, will influence my overall understanding. Let's start the search and see what the code reveals. I know I have a fair understanding of this code and will be looking for common patterns. |
| 22/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "in_dev_dump_ifmcaddr",
"PathPrefix": "net/ipv4/devinet.c"
}Results: {
"Output": "net/ipv4/devinet.c=1786=static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,\n--\nnet/ipv4/devinet.c-1842-\nnet/ipv4/devinet.c:1843:static int in_dev_dump_ifmcaddr(struct in_device *in_dev, struct sk_buff *skb,\nnet/ipv4/devinet.c-1844-\t\t\t\tstruct netlink_callback *cb, int *s_ip_idx,\n--\nnet/ipv4/devinet.c=1900=static int in_dev_dump_addr(struct in_device *in_dev, struct sk_buff *skb,\n--\nnet/ipv4/devinet.c-1907-\tcase RTM_GETMULTICAST:\nnet/ipv4/devinet.c:1908:\t\treturn in_dev_dump_ifmcaddr(in_dev, skb, cb, s_ip_idx,\nnet/ipv4/devinet.c-1909-\t\t\t\t\t fillargs);\n"
} |
| 23/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20324 output: 38 thoughts: 20 Thoughts: Here's a summary of my thought process, as requested: **Diving into the Code: `inet_dump_ifaddr`** Okay, time to get my hands dirty. I need to understand this network interface dumping functionality, so I'm zeroing in on the `inet_dump_ifaddr` function. Line 1920 is where I'll begin, as I'm assuming it's the core of the functionality. My years of experience tell me the line numbers can be helpful for navigation. I expect this function holds the key logic that I need. I'm going to start there and peel back the layers until I grasp how this process works. |
| 24/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/ipv4/devinet.c",
"FirstLine": 1915,
"LineCount": 50
}Results: {
"Contents": "1915:\t/* Combine dev_addr_genid and dev_base_seq to detect changes.\n1916:\t */\n1917:\tstatic u32 inet_base_seq(const struct net *net)\n1918:\t{\n1919:\t\tu32 res = atomic_read(\u0026net-\u003eipv4.dev_addr_genid) +\n1920:\t\t\t READ_ONCE(net-\u003edev_base_seq);\n1921:\t\n1922:\t\t/* Must not return 0 (see nl_dump_check_consistent()).\n1923:\t\t * Chose a value far away from 0.\n1924:\t\t */\n1925:\t\tif (!res)\n1926:\t\t\tres = 0x80000000;\n1927:\t\treturn res;\n1928:\t}\n1929:\t\n1930:\tstatic int inet_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,\n1931:\t\t\t\t int event)\n1932:\t{\n1933:\t\tconst struct nlmsghdr *nlh = cb-\u003enlh;\n1934:\t\tstruct inet_fill_args fillargs = {\n1935:\t\t\t.portid = NETLINK_CB(cb-\u003eskb).portid,\n1936:\t\t\t.seq = nlh-\u003enlmsg_seq,\n1937:\t\t\t.event = event,\n1938:\t\t\t.flags = NLM_F_MULTI,\n1939:\t\t\t.netnsid = -1,\n1940:\t\t};\n1941:\t\tstruct net *net = sock_net(skb-\u003esk);\n1942:\t\tstruct net *tgt_net = net;\n1943:\t\tstruct {\n1944:\t\t\tunsigned long ifindex;\n1945:\t\t\tint ip_idx;\n1946:\t\t} *ctx = (void *)cb-\u003ectx;\n1947:\t\tstruct in_device *in_dev;\n1948:\t\tstruct net_device *dev;\n1949:\t\tint err = 0;\n1950:\t\n1951:\t\trcu_read_lock();\n1952:\t\tif (cb-\u003estrict_check) {\n1953:\t\t\terr = inet_valid_dump_ifaddr_req(nlh, \u0026fillargs, \u0026tgt_net,\n1954:\t\t\t\t\t\t\t skb-\u003esk, cb);\n1955:\t\t\tif (err \u003c 0)\n1956:\t\t\t\tgoto done;\n1957:\t\n1958:\t\t\tif (fillargs.ifindex) {\n1959:\t\t\t\tdev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);\n1960:\t\t\t\tif (!dev) {\n1961:\t\t\t\t\terr = -ENODEV;\n1962:\t\t\t\t\tgoto done;\n1963:\t\t\t\t}\n1964:\t\t\t\tin_dev = __in_dev_get_rcu(dev);\n"
} |
| 25/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21307 output: 38 thoughts: 126 Thoughts: **Investigating the Address Dump Function** Okay, so here's the situation: `inet_dump_addr` is parsing the request *every single time* `dump` is called, which feels like a potential performance bottleneck. And then we've got `tgt_net` being acquired with `rtnl_get_net_ns_capable` while under RCU protection... but wait, `inet_valid_dump_ifaddr_req` calls `rtnl_get_net_ns_capable`, which then calls `put_net`? That's a bit confusing. How does `inet_dump_addr` actually handle releasing `tgt_net`? I need to track down the call chain and understand how that reference counting is managed, or if there's a potential leak here. I'm thinking, based on the way this code is structured, there may be an issue with how `tgt_net` is disposed. Let me jump into `net/ipv4/devinet.c`, specifically around line 1965, and see if I can get some clarification there. |
| 26/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/ipv4/devinet.c",
"FirstLine": 1990,
"LineCount": 30
}Results: {
"Contents": "1990:\t\n1991:\tstatic int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)\n1992:\t{\n1993:\t\treturn inet_dump_addr(skb, cb, RTM_NEWADDR);\n1994:\t}\n1995:\t\n1996:\tstatic int inet_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)\n1997:\t{\n1998:\t\treturn inet_dump_addr(skb, cb, RTM_GETMULTICAST);\n1999:\t}\n2000:\t\n2001:\tstatic void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,\n2002:\t\t\t u32 portid)\n2003:\t{\n2004:\t\tstruct inet_fill_args fillargs = {\n2005:\t\t\t.portid = portid,\n2006:\t\t\t.seq = nlh ? nlh-\u003enlmsg_seq : 0,\n2007:\t\t\t.event = event,\n2008:\t\t\t.flags = 0,\n2009:\t\t\t.netnsid = -1,\n2010:\t\t};\n2011:\t\tstruct sk_buff *skb;\n2012:\t\tint err = -ENOBUFS;\n2013:\t\tstruct net *net;\n2014:\t\n2015:\t\tnet = dev_net(ifa-\u003eifa_dev-\u003edev);\n2016:\t\tskb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);\n2017:\t\tif (!skb)\n2018:\t\t\tgoto errout;\n2019:\t\n"
} |
| 27/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22172 output: 38 thoughts: 27 Thoughts: Okay, let's dive into this. I'm focusing on lines 1965-1989 within `net/ipv4/devinet.c`. I expect these lines to be dealing with some critical aspect of IPv4 device configuration, likely concerning address management or perhaps route setup related to an interface. Given the file and the general structure of the kernel, I'm anticipating interactions with the `inetaddr` structure, maybe some netlink messaging, and definitely calls to core networking functions. I'm going to look for how addresses are added, removed, or modified. Are there any error checks of interest? I will want to see how this fits into the overall scheme of how network interfaces are managed in the IPv4 stack. Is it a central function? Is it handling a specific event? I will assess the code for maintainability. Does it follow the established style guidelines? Are there any potential areas for optimization that I can immediately identify? I will look for any potential race conditions. |
| 28/2 | 2026/09/14 02:39 | tool | read-file |
0mArgs:{
"File": "net/ipv4/devinet.c",
"FirstLine": 1965,
"LineCount": 25
}Results: {
"Contents": "1965:\t\t\t\tif (!in_dev)\n1966:\t\t\t\t\tgoto done;\n1967:\t\t\t\terr = in_dev_dump_addr(in_dev, skb, cb, \u0026ctx-\u003eip_idx,\n1968:\t\t\t\t\t\t \u0026fillargs);\n1969:\t\t\t\tgoto done;\n1970:\t\t\t}\n1971:\t\t}\n1972:\t\n1973:\t\tcb-\u003eseq = inet_base_seq(tgt_net);\n1974:\t\n1975:\t\tfor_each_netdev_dump(tgt_net, dev, ctx-\u003eifindex) {\n1976:\t\t\tin_dev = __in_dev_get_rcu(dev);\n1977:\t\t\tif (!in_dev)\n1978:\t\t\t\tcontinue;\n1979:\t\t\terr = in_dev_dump_addr(in_dev, skb, cb, \u0026ctx-\u003eip_idx,\n1980:\t\t\t\t\t \u0026fillargs);\n1981:\t\t\tif (err \u003c 0)\n1982:\t\t\t\tgoto done;\n1983:\t\t}\n1984:\tdone:\n1985:\t\tif (fillargs.netnsid \u003e= 0)\n1986:\t\t\tput_net(tgt_net);\n1987:\t\trcu_read_unlock();\n1988:\t\treturn err;\n1989:\t}\n"
} |
| 29/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22811 output: 26 thoughts: 1005 Thoughts: **Analysis of the Multicast Netlink Dump Handler for Fuzzing**
Okay, so I've been looking at this new `PF_PACKET` family dump handler for `RTM_GETMULTICAST`, specifically `rtnl_dump_mcaddr`. Seems like a good target. First, I noticed a slight difference in how `put_net` is handled compared to `inet_dump_addr`, with `put_net_track` being called *after* the `rcu_read_unlock()` in the `rtnl_dump_mcaddr` context, unlike `inet_dump_addr`. Not sure if it's significant, but something to keep in mind for later.
1. **Fuzzing Potential:** Absolutely, this is a prime candidate for fuzzing. It's a brand new feature in rtnetlink. The code involves parsing user-provided netlink messages, applying policies, dealing with dump filters, handling network namespace transitions (`rtnl_get_net_ns_capable`, `netns_tracker_alloc`), iterating net devices under RCU (`for_each_netdev_dump`), locking device multicast addresses (`netif_addr_lock_bh`), and constructing netlink messages with attributes like `IFA_TARGET_NETNSID`, `IFA_MULTICAST`, etc. This directly interacts with unprivileged or privileged userspace via rtnetlink (`AF_NETLINK`, `NETLINK_ROUTE`), making it highly reachable in standard fuzzing environments like QEMU or syzkaller. The concurrency aspects are complex, with unlocked dumps (`RTNL_FLAG_DUMP_UNLOCKED`), RCU read locks, BH locks, and continuation across dump invocations, all adding to the potential for bugs.
2. **Focus Symbols:** The main functions added or modified are:
* `rtnl_dump_mcaddr`: This is the top-level entry point, registered as the `.dumpit` handler for `PF_PACKET`/`RTM_GETMULTICAST`.
* `rtnl_valid_dump_mcaddr_req`: Handles request validation and filter extraction.
* `rtnl_dump_mcaddr_dev`: Iterates device-level multicast data, using `netif_addr_lock_bh`.
* `rtnl_fill_mcaddr`: Formats and constructs the netlink message for each multicast hardware address.
None of these are generic; they're all specific to *this* multicast dump feature. They're all static, but `rtnl_dump_mcaddr` will *not* be inlined. The other functions *might* be inlined but are distinct targets in kallsyms. Therefore, listing all of these functions provides an exact target set.
3. **Enable Configurations:** The base requirement is `CONFIG_NET=y` to enable rtnetlink. The use of `IFA_TARGET_NETNSID` and `rtnl_get_net_ns_capable` suggests network namespace support, so I should investigate whether `CONFIG_NET_NS` is also required. I'll need to check `net/Kconfig` or `init/Kconfig` for the definitive answer on this.
|
| 30/2 | 2026/09/14 02:39 | tool | grepper |
0mArgs:{
"Expression": "config NET_NS",
"PathPrefix": "init/"
}Results: {
"Output": "init/Kconfig=1460=config PID_NS\n--\ninit/Kconfig-1467-\ninit/Kconfig:1468:config NET_NS\ninit/Kconfig-1469-\tbool \"Network namespace\"\n"
} |
| 31/2 | 2026/09/14 02:39 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24609 output: 27 thoughts: 48 Thoughts: **Examining the Kernel Network Configuration** Okay, so I'm diving into the kernel's network configuration, starting with the `NET_NS` option – seems like that's defined in `init/Kconfig`. First things first, I want to understand the dependencies and structure of the network subsystem overall. I'll need to figure out if `CONFIG_NET` itself is dependent on anything specific, or if it's just a boolean option. To clarify the big picture, I need to open and examine `net/Kconfig` to see the dependencies. I have to see how it all interrelates to make the right choices in my configuration. |
| 32/2 | 2026/09/14 02:40 | tool | grepper |
0mArgs:{
"Expression": "menuconfig NET",
"PathPrefix": "net/Kconfig"
}Results: {
"Output": "net/Kconfig-5-\nnet/Kconfig:6:menuconfig NET\nnet/Kconfig-7-\tbool \"Networking support\"\n--\nnet/Kconfig=154=config NETWORK_PHY_TIMESTAMPING\n--\nnet/Kconfig-164-\nnet/Kconfig:165:menuconfig NETFILTER\nnet/Kconfig-166-\tbool \"Network packet filtering framework (Netfilter)\"\n"
} |
| 33/2 | 2026/09/14 02:40 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 24933 output: 33 thoughts: 40 Thoughts: Okay, here's my interpretation of those thoughts, summarized from my perspective as someone familiar with kernel configuration: **Navigating Kernel Configuration Options** Alright, let's see... so `CONFIG_NET` is apparently accessed within the `menuconfig` environment under the broader "NET" category. That makes sense, standard practice. But hold on, what about `CONFIG_NET_NS`? I need to check how that relates to the main network configuration. Often these dependent options are specified right next to their parent. Time to dig into the `init/Kconfig` file. I'll zero in around line 1468. Hopefully, that'll give me some context about dependencies, defaults, and the overall structure of that part of the network stack configuration. |
| 34/2 | 2026/09/14 02:40 | tool | read-file |
0mArgs:{
"File": "init/Kconfig",
"FirstLine": 1465,
"LineCount": 20
}Results: {
"Contents": "1465:\t\t processes with the same pid as long as they are in different\n1466:\t\t pid namespaces. This is a building block of containers.\n1467:\t\n1468:\tconfig NET_NS\n1469:\t\tbool \"Network namespace\"\n1470:\t\tdepends on NET\n1471:\t\tdefault y\n1472:\t\thelp\n1473:\t\t Allow user space to create what appear to be multiple instances\n1474:\t\t of the network stack.\n1475:\t\n1476:\tendif # NAMESPACES\n1477:\t\n1478:\tconfig CHECKPOINT_RESTORE\n1479:\t\tbool \"Checkpoint/restore support\"\n1480:\t\tdepends on PROC_FS\n1481:\t\tselect PROC_CHILDREN\n1482:\t\tselect KCMP\n1483:\t\tdefault n\n1484:\t\thelp\n"
} |
| 35/2 | 2026/09/14 02:40 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25414 output: 26 thoughts: 26 Thoughts: Here's my thought process, as if I were considering this myself: **Dependencies and Verification** Okay, so `NET_NS` is dependent on two other kernel configurations: `NAMESPACES` and `NET`. That's standard practice, of course; namespaces rely on the fundamental networking components. Before I dive into the specifics of `NET_NS`, let's just make sure those base requirements are in order. Specifically, I'll quickly verify the status of `NAMESPACES` first, as that seems like the more critical prerequisite for network namespaces to function correctly. Just a quick sanity check to avoid any downstream issues. |
| 36/2 | 2026/09/14 02:40 | tool | grepper |
0mArgs:{
"Expression": "config NAMESPACES",
"PathPrefix": "init/"
}Results: {
"Output": "init/Kconfig=1407=endif # CGROUPS\ninit/Kconfig-1408-\ninit/Kconfig:1409:menuconfig NAMESPACES\ninit/Kconfig-1410-\tbool \"Namespaces support\" if EXPERT\n"
} |
| 37/2 | 2026/09/14 02:40 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25675 output: 186 thoughts: 723 Thoughts: **My Analysis of the `RTM_GETMULTICAST` Netlink Request**
Okay, so I'm digging into this `PACKET` thing... specifically, I'm thinking about the `RTM_GETMULTICAST` request and its relationship to packet sockets. Aha! In `net/core/rtnetlink.c`, I see a handler: `{.protocol = PF_PACKET, .msgtype = RTM_GETMULTICAST, .dumpit = rtnl_dump_mcaddr, .flags = RTNL_FLAG_DUMP_UNLOCKED}`. My first thought was whether `CONFIG_PACKET` was a dependency.
But wait a minute... I remember the `struct rtnl_msg_handler` protocol field corresponds to `ifa_family` (which is `AF_PACKET` aka `PF_PACKET` which is 17) in the netlink request header. This is the key – the routing is based on the address family. When a user sends a netlink message with `RTM_GETMULTICAST`, the system uses `ifa_family` to decide what to do. So it's not strictly tied to `CONFIG_PACKET` because `PF_PACKET` is defined regardless.
However, I'm thinking, `CONFIG_PACKET` could be relevant if a user *also* opens an `AF_PACKET` socket. But in this specific `RTM_GETMULTICAST` case, the requests are sent over an `AF_NETLINK` socket (`NETLINK_ROUTE`). That clears that up.
So, *what* socket are we actually using for `RTM_GETMULTICAST`? It's a netlink socket: `socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)`.
Now, does `CONFIG_NET` cover `AF_NETLINK`? Yep, `af_netlink.c` is compiled when `CONFIG_NET=y`, so that's covered.
Are there any other dependencies for `rtnl_dump_mcaddr` or the relevant `rtnetlink.c` code? Seems I need `NET` and `NET_NS` for network namespace support (particularly for that `IFA_TARGET_NETNSID` attribute).
Just to be thorough, I'm double-checking for any other configuration variables… nope, that's it. It's really solid.
The netlink dump handler is `rtnl_dump_mcaddr()`, with validation and filtering done by `rtnl_valid_dump_mcaddr_req()`. It uses `rtnl_dump_mcaddr_dev()` to iterate over device multicast addresses safely, and `rtnl_fill_mcaddr()` to assemble the attributes.
This looks like a great target for fuzzing. It's core networking code, exposed via standard `AF_NETLINK` sockets, and reachable from userspace. It's a clear win. I'm satisfied.
|
| 38/2 | 2026/09/14 02:40 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"NET",
"NET_NS"
],
"FocusSymbols": [
"rtnl_dump_mcaddr",
"rtnl_dump_mcaddr_dev",
"rtnl_fill_mcaddr",
"rtnl_valid_dump_mcaddr_req"
],
"Reasoning": "The patch adds support for dumping link-layer multicast addresses via rtnetlink (RTM_GETMULTICAST with protocol/family AF_PACKET) in net/core/rtnetlink.c. This introduces new parsing, validation, device iteration under RCU and netif_addr_lock_bh, network namespace tracking, and netlink message formatting. The code is in the core networking subsystem and directly accessible from userspace over NETLINK_ROUTE sockets in standard virtualized environments.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"NET",
"NET_NS"
],
"FocusSymbols": [
"rtnl_dump_mcaddr",
"rtnl_dump_mcaddr_dev",
"rtnl_fill_mcaddr",
"rtnl_valid_dump_mcaddr_req"
],
"Reasoning": "The patch adds support for dumping link-layer multicast addresses via rtnetlink (RTM_GETMULTICAST with protocol/family AF_PACKET) in net/core/rtnetlink.c. This introduces new parsing, validation, device iteration under RCU and netif_addr_lock_bh, network namespace tracking, and netlink message formatting. The code is in the core networking subsystem and directly accessible from userspace over NETLINK_ROUTE sockets in standard virtualized environments.",
"WorthFuzzing": true
} |
| 39/1 | 2026/09/14 02:40 | action | If |
3mArgs:{
"WorthFuzzing": true
}Results: null |
| 40/2 | 2026/09/14 02:40 | agent | kmsan-evaluator |
3mModel:core Args: null Results: {
"KMSANReasoning": "The patch series introduces AF_PACKET support for RTM_GETMULTICAST netlink dumps, adding rtnl_fill_mcaddr(), rtnl_dump_mcaddr_dev(), and rtnl_dump_mcaddr().\n\nDetailed analysis of memory safety and sanitizers applicability:\n1. Kernel-to-user info leaks:\n - The message payload header `struct ifaddrmsg` contains five fields (ifa_family, ifa_prefixlen, ifa_flags, ifa_scope, ifa_index) totaling 8 bytes with zero padding holes. All 5 fields are explicitly assigned in rtnl_fill_mcaddr().\n - Alignment padding in netlink message headers and netlink attributes is automatically zeroed by __nlmsg_put() and __nla_reserve() (via memset()).\n - The link-layer hardware address attribute IFA_MULTICAST copies exactly `dev-\u003eaddr_len` bytes from `ha-\u003eaddr`. When `struct netdev_hw_addr` is allocated and added (in __hw_addr_create), `dev-\u003eaddr_len` bytes are populated into `ha-\u003eaddr`. Thus no uninitialized bytes past `dev-\u003eaddr_len` are ever read or exposed.\n - Other attributes (IFA_TARGET_NETNSID, IFA_MC_USERS, IFA_FLAGS) are 4-byte scalar integers with no uninitialized bytes or padding.\n\n2. Uninitialized variables / conditional branches:\n - Local stack structure `struct rtnl_mcaddr_dump_filter filter` is initialized with designated initializers, guaranteeing that all other fields (ns_tracker, ifindex) are zeroed.\n - The netlink dump state `cb-\u003ectx` is guaranteed zero-initialized by __netlink_dump_start() via memset().\n\n3. KASAN vs KMSAN:\n - The potential risks introduced by this patch involve RCU lifetime (RCU read locks, dev_get_by_index_rcu), locking (netif_addr_lock_bh), netns tracking reference counts (put_net_track), and skb length limits (-EMSGSIZE / nlmsg_cancel). All of these are monitored and caught by standard debug builds (KASAN, LOCKDEP, refcount checks).\n - There are no uninitialized memory reads or information leaks that would be unique to KMSAN.\n\nTherefore, dedicated KMSAN fuzzing is not needed.",
"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 c4f5c94bdbc1fa681f251ed4e4efc6e0cdfe08dd
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Sep 14 02:39:01 2026 +0000
syz-cluster: applied patch under review
diff --git a/Documentation/netlink/specs/rt-addr.yaml b/Documentation/netlink/specs/rt-addr.yaml
index 0ecbd24c890c6..1a17e55d1cca0 100644
--- a/Documentation/netlink/specs/rt-addr.yaml
+++ b/Documentation/netlink/specs/rt-addr.yaml
@@ -77,6 +77,8 @@ definitions:
name: mcautojoin
-
name: stable-privacy
+ -
+ name: global
attribute-sets:
-
@@ -119,7 +121,7 @@ attribute-sets:
type: u32
-
name: target-netnsid
- type: binary
+ type: s32
-
name: proto
type: u8
@@ -168,7 +170,13 @@ operations:
attributes: *ifaddr-all
-
name: getmulticast
- doc: Get / dump IPv4/IPv6 multicast addresses.
+ doc: |
+ Get / dump multicast addresses. ifa-family must select the address
+ family: AF_INET or AF_INET6 for the IP multicast groups joined on
+ a device, AF_PACKET for the link-layer multicast addresses in the
+ device filter. Link-layer entries added explicitly, e.g. with
+ SIOCADDMULTI or "bridge fdb add ... self", rather than by a
+ protocol join are reported with the global flag set.
attribute-set: addr-attrs
fixed-header: ifaddrmsg
do:
@@ -181,10 +189,13 @@ operations:
- multicast
- mc-users
- cacheinfo
+ - flags
+ - target-netnsid
dump:
request:
value: 58
- attributes: []
+ attributes:
+ - target-netnsid
reply:
value: 58
attributes: *mcaddr-attrs
diff --git a/include/uapi/linux/if_addr.h b/include/uapi/linux/if_addr.h
index 7fb630b7fe311..0a1ad9ebb47be 100644
--- a/include/uapi/linux/if_addr.h
+++ b/include/uapi/linux/if_addr.h
@@ -57,6 +57,7 @@ enum {
#define IFA_F_NOPREFIXROUTE 0x200
#define IFA_F_MCAUTOJOIN 0x400
#define IFA_F_STABLE_PRIVACY 0x800
+#define IFA_F_GLOBAL 0x1000
struct ifa_cacheinfo {
__u32 ifa_prefered;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index be9d1625bac31..5f3e692a828b8 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4571,6 +4571,178 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len ? : ret;
}
+static int rtnl_fill_mcaddr(struct sk_buff *skb, const struct net_device *dev,
+ const struct netdev_hw_addr *ha, u32 portid,
+ u32 seq, unsigned int flags, int netnsid)
+{
+ u32 ifa_flags = ha->global_use ? IFA_F_GLOBAL : 0;
+ struct ifaddrmsg *ifm;
+ struct nlmsghdr *nlh;
+
+ nlh = nlmsg_put(skb, portid, seq, RTM_GETMULTICAST, sizeof(*ifm),
+ flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ ifm = nlmsg_data(nlh);
+ ifm->ifa_family = AF_PACKET;
+ ifm->ifa_prefixlen = 0;
+ /* ifm->ifa_flags holds 8 bits, the full value is in IFA_FLAGS */
+ ifm->ifa_flags = (__u8)ifa_flags;
+ ifm->ifa_scope = RT_SCOPE_LINK;
+ ifm->ifa_index = dev->ifindex;
+
+ if ((netnsid >= 0 &&
+ nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)) ||
+ nla_put(skb, IFA_MULTICAST, dev->addr_len, ha->addr) ||
+ nla_put_u32(skb, IFA_MC_USERS, ha->refcount) ||
+ nla_put_u32(skb, IFA_FLAGS, ifa_flags)) {
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+ }
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int rtnl_dump_mcaddr_dev(struct net_device *dev, struct sk_buff *skb,
+ struct netlink_callback *cb, int *s_addr_idx,
+ unsigned int flags, int netnsid)
+{
+ struct netdev_hw_addr *ha;
+ int addr_idx = 0;
+ int err = 0;
+
+ netif_addr_lock_bh(dev);
+ netdev_for_each_mc_addr(ha, dev) {
+ if (addr_idx < *s_addr_idx) {
+ addr_idx++;
+ continue;
+ }
+ err = rtnl_fill_mcaddr(skb, dev, ha, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, flags, netnsid);
+ if (err < 0)
+ break;
+ addr_idx++;
+ }
+ netif_addr_unlock_bh(dev);
+
+ *s_addr_idx = err < 0 ? addr_idx : 0;
+
+ return err;
+}
+
+struct rtnl_mcaddr_dump_filter {
+ struct net *tgt_net;
+ netns_tracker ns_tracker;
+ int netnsid;
+ int ifindex;
+};
+
+static const struct nla_policy rtnl_mcaddr_dump_policy[IFA_MAX + 1] = {
+ [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
+};
+
+static int rtnl_valid_dump_mcaddr_req(const struct nlmsghdr *nlh,
+ struct sock *sk,
+ struct rtnl_mcaddr_dump_filter *filter,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[IFA_MAX + 1];
+ struct ifaddrmsg *ifm;
+ int err;
+
+ ifm = nlmsg_payload(nlh, sizeof(*ifm));
+ if (!ifm) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid header for multicast dump request");
+ return -EINVAL;
+ }
+
+ if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid values in multicast dump header");
+ return -EINVAL;
+ }
+
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,
+ rtnl_mcaddr_dump_policy, extack);
+ if (err < 0)
+ return err;
+
+ if (tb[IFA_TARGET_NETNSID]) {
+ struct net *net;
+
+ filter->netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
+ net = rtnl_get_net_ns_capable(sk, filter->netnsid);
+ if (IS_ERR(net)) {
+ NL_SET_ERR_MSG(extack,
+ "Invalid target network namespace id");
+ return PTR_ERR(net);
+ }
+ netns_tracker_alloc(net, &filter->ns_tracker, GFP_KERNEL);
+ filter->tgt_net = net;
+ }
+
+ filter->ifindex = ifm->ifa_index;
+
+ return 0;
+}
+
+static int rtnl_dump_mcaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct rtnl_mcaddr_dump_filter filter = {
+ .tgt_net = sock_net(skb->sk),
+ .netnsid = -1,
+ };
+ unsigned int flags = NLM_F_MULTI;
+ struct {
+ unsigned long ifindex;
+ int addr_idx;
+ } *ctx = (void *)cb->ctx;
+ unsigned long s_ifindex;
+ struct net_device *dev;
+ int err;
+
+ err = rtnl_valid_dump_mcaddr_req(cb->nlh, skb->sk, &filter,
+ cb->extack);
+ if (err < 0)
+ return err;
+
+ rcu_read_lock();
+
+ if (filter.ifindex) {
+ cb->answer_flags |= NLM_F_DUMP_FILTERED;
+ flags |= NLM_F_DUMP_FILTERED;
+ dev = dev_get_by_index_rcu(filter.tgt_net, filter.ifindex);
+ if (!dev) {
+ err = -ENODEV;
+ goto out;
+ }
+ err = rtnl_dump_mcaddr_dev(dev, skb, cb, &ctx->addr_idx, flags,
+ filter.netnsid);
+ goto out;
+ }
+
+ s_ifindex = ctx->ifindex;
+ for_each_netdev_dump(filter.tgt_net, dev, ctx->ifindex) {
+ /* The device the dump stopped at is gone, do not skip
+ * entries of the next one.
+ */
+ if (dev->ifindex != s_ifindex)
+ ctx->addr_idx = 0;
+ err = rtnl_dump_mcaddr_dev(dev, skb, cb, &ctx->addr_idx, flags,
+ filter.netnsid);
+ if (err < 0)
+ break;
+ }
+out:
+ rcu_read_unlock();
+ if (filter.netnsid >= 0)
+ put_net_track(filter.tgt_net, &filter.ns_tracker);
+ return err;
+}
+
struct sk_buff *rtmsg_ifinfo_build_skb(int type, struct net_device *dev,
unsigned int change,
u32 event, gfp_t flags, int *new_nsid,
@@ -7256,6 +7428,8 @@ static const struct rtnl_msg_handler rtnetlink_rtnl_msg_handlers[] __initconst =
{.msgtype = RTM_SETSTATS, .doit = rtnl_stats_set},
{.msgtype = RTM_NEWLINKPROP, .doit = rtnl_newlinkprop},
{.msgtype = RTM_DELLINKPROP, .doit = rtnl_dellinkprop},
+ {.protocol = PF_PACKET, .msgtype = RTM_GETMULTICAST,
+ .dumpit = rtnl_dump_mcaddr, .flags = RTNL_FLAG_DUMP_UNLOCKED},
{.protocol = PF_BRIDGE, .msgtype = RTM_GETLINK,
.dumpit = rtnl_bridge_getlink},
{.protocol = PF_BRIDGE, .msgtype = RTM_DELLINK,
diff --git a/tools/testing/selftests/net/rtnetlink.py b/tools/testing/selftests/net/rtnetlink.py
index 5cc3ebdcf08de..d69d375a2deff 100755
--- a/tools/testing/selftests/net/rtnetlink.py
+++ b/tools/testing/selftests/net/rtnetlink.py
@@ -1,17 +1,21 @@
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
+import errno
import socket
import struct
import time
from lib.py import bkg, ip, ksft_exit, ksft_run, ksft_eq, ksft_ge, ksft_true, KsftSkipEx
-from lib.py import ksft_not_in, ksft_not_none
-from lib.py import CmdExitFailure, NetNS, NetNSEnter, RtnlAddrFamily, RtnlRouteFamily
+from lib.py import ksft_in, ksft_not_in, ksft_not_none
+from lib.py import CmdExitFailure, NetNS, NetNSEnter, NlError, RtnlAddrFamily, RtnlRouteFamily
from lib.py import defer
IPV4_ALL_HOSTS_MULTICAST = b'\xe0\x00\x00\x01'
IPV4_TEST_MULTICAST = b'\xef\x01\x01\x01'
IPV6_TEST_MULTICAST = bytes.fromhex('ff020000000000000000000000000123')
+ETH_ALL_HOSTS_MULTICAST = bytes.fromhex('01005e000001')
+ETH_TEST_MULTICAST_STR = '01:00:5e:01:01:01'
+ETH_TEST_MULTICAST = bytes.fromhex(ETH_TEST_MULTICAST_STR.replace(':', ''))
def _users_for(rtnl: RtnlAddrFamily, family: int, grp: bytes, ifindex: int):
@@ -105,6 +109,70 @@ def dump_mcaddr6_check() -> None:
s2.close()
+def dump_mcaddr_l2_check() -> None:
+ """
+ Verify link-layer multicast addresses in an AF_PACKET RTM_GETMULTICAST
+ dump: the ifa-index filter, mc-users, the global flag and
+ target-netnsid.
+ """
+
+ with NetNS() as ns, NetNSEnter(str(ns)):
+ for ifname in ("dummy1", "dummy2"):
+ ip(f"link add name {ifname} type dummy")
+ ip(f"link set {ifname} up")
+ dev_idx = socket.if_nametoindex("dummy1")
+ ip(f"maddr add {ETH_TEST_MULTICAST_STR} dev dummy1")
+
+ rtnl = RtnlAddrFamily()
+ defer(rtnl.close)
+ try:
+ addresses = rtnl.getmulticast(
+ {"ifa-family": socket.AF_PACKET, "ifa-index": dev_idx},
+ dump=True)
+ except NlError as e:
+ if e.error == errno.EOPNOTSUPP:
+ raise KsftSkipEx(
+ "kernel does not support AF_PACKET multicast dump")
+ raise
+
+ # dummy2 has entries as well, only dummy1 may be listed
+ ksft_eq({addr['ifa-index'] for addr in addresses}, {dev_idx},
+ "AF_PACKET multicast dump ignored ifa-index filter")
+
+ entries = {addr['multicast']: addr for addr in addresses}
+
+ # Bringing an Ethernet device up joins 224.0.0.1, which maps
+ # to 01:00:5e:00:00:01 in the device multicast list.
+ all_hosts = entries.get(ETH_ALL_HOSTS_MULTICAST)
+ ksft_not_none(all_hosts,
+ "dummy1 does not have the all-hosts link-layer address")
+ if all_hosts is not None:
+ ksft_not_in('global', all_hosts['flags'],
+ "protocol entry is global")
+
+ static = entries.get(ETH_TEST_MULTICAST)
+ ksft_not_none(static, "dummy1 does not have the SIOCADDMULTI address")
+ if static is not None:
+ ksft_eq(static['mc-users'], 1,
+ "unexpected mc-users for the SIOCADDMULTI address")
+ ksft_in('global', static['flags'],
+ "SIOCADDMULTI entry is not global")
+
+ # target-netnsid dumps another netns, ifa-index is relative to it
+ with NetNS() as peer:
+ ip(f"netns set {peer} 5")
+ ip("link add name dummy3 type dummy", ns=peer)
+ ip("link set dummy3 up", ns=peer)
+ peer_idx = ip("link show dummy3", json=True, ns=peer)[0]['ifindex']
+
+ addresses = rtnl.getmulticast(
+ {"ifa-family": socket.AF_PACKET, "target-netnsid": 5,
+ "ifa-index": peer_idx}, dump=True)
+ ksft_eq({(addr['ifa-index'], addr['target-netnsid'])
+ for addr in addresses}, {(peer_idx, 5)},
+ "target-netnsid did not dump the peer netns")
+
+
def ipv4_devconf_notify() -> None:
"""
Configure an interface and set ipv4-devconf values through netlink
@@ -315,7 +383,8 @@ def ipv6_route_del_reason_absent() -> None:
def main() -> None:
- ksft_run([dump_mcaddr_check, dump_mcaddr6_check, ipv4_devconf_notify,
+ ksft_run([dump_mcaddr_check, dump_mcaddr6_check, dump_mcaddr_l2_check,
+ ipv4_devconf_notify,
ipv6_route_del_reason_expired,
ipv6_route_del_reason_ra_withdrawn,
ipv6_route_del_reason_absent])
|
| 41/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6627 output: 19 thoughts: 781 Thoughts: **KMSAN Fuzzing Justification: A Deep Dive** Okay, let's see if this patch series warrants a dedicated KMSAN fuzzing session, beyond what we're already doing with KASAN. My initial thought is to break down the patch components and see if anything jumps out as particularly interesting from a memory safety perspective. First, I've got a summary of the patch: It's updating the netlink spec for `getmulticast` in `Documentation/netlink/specs/rt-addr.yaml`, and it's adding AF_PACKET support, `IFA_F_GLOBAL`, `target-netnsid`, and so on. We've got a new definition for `IFA_F_GLOBAL`, and the core logic is implemented in `net/core/rtnetlink.c`, which includes functions like `rtnl_fill_mcaddr`, `rtnl_dump_mcaddr_dev`, and several others related to dumping multicast addresses. Plus, there are some self-tests in `tools/testing/selftests/net/rtnetlink.py`. Now, let's focus on `rtnl_fill_mcaddr` – that seems like a good place to start. Looking at the code snippet, it's building a netlink message, and I'm looking for where we're copying data into the `sk_buff`. Specifically, it appears the function deals with flags, an index, a netnsid, the multicast address itself, user counts, and flags again. Okay, it looks like it's putting data into the `nlmsghdr`, and then it uses `nla_put` and `nla_put_u32` to pack the attributes. The use of `nla_put` is pretty common; this could be good, but it's not immediately obvious that this needs KMSAN over KASAN. I'm starting to think about potential padding issues in the `struct ifaddrmsg`. We've got `ifa_family`, `ifa_prefixlen`, `ifa_flags`, `ifa_scope`, and `ifa_index`. My gut tells me we should double-check that this structure doesn't introduce any subtle alignment or padding vulnerabilities during these netlink operations. Let me quickly check the definition of `struct ifaddrmsg` to verify its structure using `grepper`. |
| 42/3 | 2026/09/14 02:40 | tool | grepper |
0mArgs:{
"Expression": "struct ifaddrmsg \\{"
}Results: {
"Output": "include/uapi/linux/if_addr.h-7-\ninclude/uapi/linux/if_addr.h:8:struct ifaddrmsg {\ninclude/uapi/linux/if_addr.h-9-\t__u8\t\tifa_family;\n--\ntools/include/uapi/linux/if_addr.h-7-\ntools/include/uapi/linux/if_addr.h:8:struct ifaddrmsg {\ntools/include/uapi/linux/if_addr.h-9-\t__u8\t\tifa_family;\n"
} |
| 43/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8078 output: 38 thoughts: 23 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Diving into if_addr.h** Okay, let's pull up `include/uapi/linux/if_addr.h`. Specifically, I'm going to jump right to around line 8. I'm probably looking for the fundamental data structures used to represent network interface addresses, likely the core `ifaddrmsg` structure or something similar, and maybe the associated constants or macros. I anticipate it's likely where the kernel defines the basic attributes of an interface's IP, MAC or other network addresses. I'll need to refresh myself on how the interface addresses are represented within the kernel, so this header file seems like the best starting point. I'm going to look for any bitfield definitions or unions that reveal how the different address families are handled within this structure. |
| 44/3 | 2026/09/14 02:40 | tool | read-file |
0mArgs:{
"File": "include/uapi/linux/if_addr.h",
"FirstLine": 8,
"LineCount": 25
}Results: {
"Contents": " 8:\tstruct ifaddrmsg {\n 9:\t\t__u8\t\tifa_family;\n 10:\t\t__u8\t\tifa_prefixlen;\t/* The prefix length\t\t*/\n 11:\t\t__u8\t\tifa_flags;\t/* Flags\t\t\t*/\n 12:\t\t__u8\t\tifa_scope;\t/* Address scope\t\t*/\n 13:\t\t__u32\t\tifa_index;\t/* Link index\t\t\t*/\n 14:\t};\n 15:\t\n 16:\t/*\n 17:\t * Important comment:\n 18:\t * IFA_ADDRESS is prefix address, rather than local interface address.\n 19:\t * It makes no difference for normally configured broadcast interfaces,\n 20:\t * but for point-to-point IFA_ADDRESS is DESTINATION address,\n 21:\t * local address is supplied in IFA_LOCAL attribute.\n 22:\t *\n 23:\t * IFA_FLAGS is a u32 attribute that extends the u8 field ifa_flags.\n 24:\t * If present, the value from struct ifaddrmsg will be ignored.\n 25:\t */\n 26:\tenum {\n 27:\t\tIFA_UNSPEC,\n 28:\t\tIFA_ADDRESS,\n 29:\t\tIFA_LOCAL,\n 30:\t\tIFA_LABEL,\n 31:\t\tIFA_BROADCAST,\n 32:\t\tIFA_ANYCAST,\n"
} |
| 45/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8688 output: 22 thoughts: 253 Thoughts: **Analyzing the ifaddrmsg Structure and Multicast Address Handling** Okay, so I'm looking at this `struct ifaddrmsg` definition, and the first thing that jumps out is its compact size – just 8 bytes, no padding. That's good, efficient. And the initialization in `rtnl_fill_mcaddr` looks straightforward: family, prefix length, flags, scope, and index all get assigned. They're explicitly setting each field, which is exactly what I would expect. The `ifa_flags` field is an 8-bit integer, and then the full value is maintained in the `IFA_FLAGS` macro, makes perfect sense, typical Linux kernel design. But hold on a second. I'm seeing a `nla_put` call with `IFA_MULTICAST` and then `dev->addr_len` and `ha->addr`. Where is this `ha->addr` coming from? Is that buffer, whatever it is, actually *initialized* for `dev->addr_len` bytes? I need to be sure the memory is valid and populated with the correct multicast address. Let's dig into `struct netdev_hw_addr` to verify that assumption. I need to understand how the hardware address is managed. |
| 46/3 | 2026/09/14 02:40 | tool | grepper |
0mArgs:{
"Expression": "struct netdev_hw_addr \\{"
}Results: {
"Output": "include/linux/netdevice.h=235=struct sk_buff;\ninclude/linux/netdevice.h-236-\ninclude/linux/netdevice.h:237:struct netdev_hw_addr {\ninclude/linux/netdevice.h-238-\tstruct list_head\tlist;\n"
} |
| 47/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9322 output: 36 thoughts: 21 Thoughts: Here's my summary, as if I were thinking these thoughts: **Diving into the Network Device Header** Okay, time to get my hands dirty. I need to understand something about the network device initialization process, so I'm going to jump straight into the kernel source. Let's start with `include/linux/netdevice.h`. Specifically, I'm aiming for around line 237. I'm hoping that particular section contains the definitions or data structures I'm looking for regarding the basic network device structure or perhaps the initial setup routines. I'm expecting to find some crucial elements like data structures for queues, interrupt management, or potentially device-specific configuration pointers. Let's see what's there... |
| 48/3 | 2026/09/14 02:40 | tool | read-file |
0mArgs:{
"File": "include/linux/netdevice.h",
"FirstLine": 237,
"LineCount": 30
}Results: {
"Contents": " 237:\tstruct netdev_hw_addr {\n 238:\t\tstruct list_head\tlist;\n 239:\t\tstruct rb_node\t\tnode;\n 240:\t\tunsigned char\t\taddr[MAX_ADDR_LEN];\n 241:\t\tunsigned char\t\ttype;\n 242:\t#define NETDEV_HW_ADDR_T_LAN\t\t1\n 243:\t#define NETDEV_HW_ADDR_T_SAN\t\t2\n 244:\t#define NETDEV_HW_ADDR_T_UNICAST\t3\n 245:\t#define NETDEV_HW_ADDR_T_MULTICAST\t4\n 246:\t\tbool\t\t\tglobal_use;\n 247:\t\tint\t\t\tsync_cnt;\n 248:\t\tint\t\t\trefcount;\n 249:\t\tint\t\t\tsynced;\n 250:\t\tstruct rcu_head\t\trcu_head;\n 251:\t};\n 252:\t\n 253:\tstruct netdev_hw_addr_list {\n 254:\t\tstruct list_head\tlist;\n 255:\t\tint\t\t\tcount;\n 256:\t\n 257:\t\t/* Auxiliary tree for faster lookup on addition and deletion */\n 258:\t\tstruct rb_root\t\ttree;\n 259:\t};\n 260:\t\n 261:\t#define netdev_hw_addr_list_count(l) ((l)-\u003ecount)\n 262:\t#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)\n 263:\t#define netdev_hw_addr_list_for_each(ha, l) \\\n 264:\t\tlist_for_each_entry(ha, \u0026(l)-\u003elist, list)\n 265:\t\n 266:\t#define netdev_uc_count(dev) netdev_hw_addr_list_count(\u0026(dev)-\u003euc)\n"
} |
| 49/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10044 output: 27 thoughts: 41 Thoughts: Okay, let's dive into this. I need to understand how this `ha` value gets allocated and integrated into the multicast list, `mc_list`. My initial instinct is to track down the relevant code paths. So, I'm going to reach for `grep`. I'll start with a broad search, looking for key function names. I'll search for things like `__hw_addr_create`, or `dev_mc_add`, or anything else that sounds like it might handle hardware address creation or multicast address addition, respectively. That should give me a good starting point for tracing the execution flow and seeing how `ha` comes into play. From there, I can drill down into the specific allocation and integration logic. I expect to find some interesting details there. |
| 50/3 | 2026/09/14 02:40 | tool | grepper |
0mArgs:{
"Expression": "__hw_addr_create|__hw_addr_add"
}Results: {
"Output": "net/core/dev_addr_lists.c=52=static struct netdev_hw_addr*\nnet/core/dev_addr_lists.c:53:__hw_addr_create(const unsigned char *addr, int addr_len,\nnet/core/dev_addr_lists.c-54-\t\t unsigned char addr_type, bool global, bool sync)\n--\nnet/core/dev_addr_lists.c-74-\nnet/core/dev_addr_lists.c:75:static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,\nnet/core/dev_addr_lists.c-76-\t\t\t const unsigned char *addr, int addr_len,\n--\nnet/core/dev_addr_lists.c-119-\nnet/core/dev_addr_lists.c:120:\tha = __hw_addr_create(addr, addr_len, addr_type, global, sync);\nnet/core/dev_addr_lists.c-121-\tif (!ha)\n--\nnet/core/dev_addr_lists.c-132-\nnet/core/dev_addr_lists.c:133:static int __hw_addr_add(struct netdev_hw_addr_list *list,\nnet/core/dev_addr_lists.c-134-\t\t\t const unsigned char *addr, int addr_len,\n--\nnet/core/dev_addr_lists.c-136-{\nnet/core/dev_addr_lists.c:137:\treturn __hw_addr_add_ex(list, addr, addr_len, addr_type, false, false,\nnet/core/dev_addr_lists.c-138-\t\t\t\t0, false);\n--\nnet/core/dev_addr_lists.c=212=static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,\n--\nnet/core/dev_addr_lists.c-217-\nnet/core/dev_addr_lists.c:218:\terr = __hw_addr_add_ex(to_list, ha-\u003eaddr, addr_len, ha-\u003etype,\nnet/core/dev_addr_lists.c-219-\t\t\t false, true, ha-\u003esync_cnt, false);\n--\nnet/core/dev_addr_lists.c=528=int __hw_addr_list_snapshot(struct netdev_hw_addr_list *snap,\n--\nnet/core/dev_addr_lists.c-544-\t\t} else {\nnet/core/dev_addr_lists.c:545:\t\t\tentry = __hw_addr_create(ha-\u003eaddr, addr_len, ha-\u003etype,\nnet/core/dev_addr_lists.c-546-\t\t\t\t\t\t false, false);\n--\nnet/core/dev_addr_lists.c=679=int dev_addr_init(struct net_device *dev)\n--\nnet/core/dev_addr_lists.c-688-\tmemset(addr, 0, sizeof(addr));\nnet/core/dev_addr_lists.c:689:\terr = __hw_addr_add(\u0026dev-\u003edev_addrs, addr, sizeof(addr),\nnet/core/dev_addr_lists.c-690-\t\t\t NETDEV_HW_ADDR_T_LAN);\n--\nnet/core/dev_addr_lists.c=729=int dev_addr_add(struct net_device *dev, const unsigned char *addr,\n--\nnet/core/dev_addr_lists.c-738-\t\treturn err;\nnet/core/dev_addr_lists.c:739:\terr = __hw_addr_add(\u0026dev-\u003edev_addrs, addr, dev-\u003eaddr_len, addr_type);\nnet/core/dev_addr_lists.c-740-\tif (!err)\n--\nnet/core/dev_addr_lists.c=792=int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr)\n--\nnet/core/dev_addr_lists.c-796-\tnetif_addr_lock_bh(dev);\nnet/core/dev_addr_lists.c:797:\terr = __hw_addr_add_ex(\u0026dev-\u003euc, addr, dev-\u003eaddr_len,\nnet/core/dev_addr_lists.c-798-\t\t\t NETDEV_HW_ADDR_T_UNICAST, true, false,\n--\nnet/core/dev_addr_lists.c=815=int dev_uc_add(struct net_device *dev, const unsigned char *addr)\n--\nnet/core/dev_addr_lists.c-819-\tnetif_addr_lock_bh(dev);\nnet/core/dev_addr_lists.c:820:\terr = __hw_addr_add(\u0026dev-\u003euc, addr, dev-\u003eaddr_len,\nnet/core/dev_addr_lists.c-821-\t\t\t NETDEV_HW_ADDR_T_UNICAST);\n--\nnet/core/dev_addr_lists.c=977=int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)\n--\nnet/core/dev_addr_lists.c-981-\tnetif_addr_lock_bh(dev);\nnet/core/dev_addr_lists.c:982:\terr = __hw_addr_add_ex(\u0026dev-\u003emc, addr, dev-\u003eaddr_len,\nnet/core/dev_addr_lists.c-983-\t\t\t NETDEV_HW_ADDR_T_MULTICAST, true, false,\n--\nnet/core/dev_addr_lists.c=992=static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,\n--\nnet/core/dev_addr_lists.c-997-\tnetif_addr_lock_bh(dev);\nnet/core/dev_addr_lists.c:998:\terr = __hw_addr_add_ex(\u0026dev-\u003emc, addr, dev-\u003eaddr_len,\nnet/core/dev_addr_lists.c-999-\t\t\t NETDEV_HW_ADDR_T_MULTICAST, global, false,\n"
} |
| 51/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11830 output: 38 thoughts: 26 Thoughts: Here's my take on the thought process, as if it were my own: **Investigating a Network Device Address Creation Function** Okay, time to dive in. I need to get a handle on how network hardware addresses are being created, so I'm heading directly to the likely source code. Let's start with `__hw_addr_create` within `net/core/dev_addr_lists.c`. I expect this function holds the core logic for generating or assigning those MAC and other hardware addresses. This function is probably central to the overall process. |
| 52/3 | 2026/09/14 02:40 | tool | read-file |
0mArgs:{
"File": "net/core/dev_addr_lists.c",
"FirstLine": 52,
"LineCount": 25
}Results: {
"Contents": " 52:\tstatic struct netdev_hw_addr*\n 53:\t__hw_addr_create(const unsigned char *addr, int addr_len,\n 54:\t\t\t unsigned char addr_type, bool global, bool sync)\n 55:\t{\n 56:\t\tstruct netdev_hw_addr *ha;\n 57:\t\tint alloc_size;\n 58:\t\n 59:\t\talloc_size = sizeof(*ha);\n 60:\t\tif (alloc_size \u003c L1_CACHE_BYTES)\n 61:\t\t\talloc_size = L1_CACHE_BYTES;\n 62:\t\tha = kmalloc(alloc_size, GFP_ATOMIC);\n 63:\t\tif (!ha)\n 64:\t\t\treturn NULL;\n 65:\t\tmemcpy(ha-\u003eaddr, addr, addr_len);\n 66:\t\tha-\u003etype = addr_type;\n 67:\t\tha-\u003erefcount = 1;\n 68:\t\tha-\u003eglobal_use = global;\n 69:\t\tha-\u003esynced = sync ? 1 : 0;\n 70:\t\tha-\u003esync_cnt = 0;\n 71:\t\n 72:\t\treturn ha;\n 73:\t}\n 74:\t\n 75:\tstatic int __hw_addr_add_ex(struct netdev_hw_addr_list *list,\n 76:\t\t\t\t const unsigned char *addr, int addr_len,\n"
} |
| 53/3 | 2026/09/14 02:40 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12382 output: 22 thoughts: 364 Thoughts: **Investigating Potential Uninitialized Memory in Multicast Address Handling** Okay, let's break this down. I'm looking at the `__hw_addr_create` function. I see that it uses `memcpy` to copy `addr_len` bytes into `ha->addr`. And I note that when `dev_mc_add` is invoked, `addr_len` is equal to `dev->addr_len`. Now, when `rtnl_fill_mcaddr` is used, the code calls `nla_put` to put the multicast address in the Netlink message. Specifically, `nla_put(skb, IFA_MULTICAST, dev->addr_len, ha->addr)` is called. So it's copying exactly `dev->addr_len` bytes from `ha->addr`. Seems straightforward... But then it hits me: could `dev->addr_len` somehow change or differ between when `dev_mc_add` is called and when `rtnl_fill_mcaddr` is used? That's a potential race condition I should investigate further. And then I remember, `ha->addr` has a size of `MAX_ADDR_LEN` (32 bytes). Ah, this is where it gets interesting! Did the code zero the `ha->addr` memory? I see it uses `kmalloc` without `__GFP_ZERO`. So, bytes `ha->addr[addr_len .. MAX_ADDR_LEN-1]` are uninitialized! That's a classic source of problems. However, a closer look at `rtnl_fill_mcaddr` reveals that `nla_put` only accesses the first `dev->addr_len` bytes. That part seems safe in principle, because `nla_put` is only copying `dev->addr_len` bytes. So the uninitialized memory past those bytes shouldn't be read. But wait a minute, does `nla_put` pad the attribute? Because if it does, it could write uninitialized data, or read it. I have to look into `nla_put` more closely. I should check how `nla_put` works, especially if it does zeroing and if it pads. Time to check the source! Specifically, let's see how `nla_put` and the internal `__nla_put` work in the Linux kernel and if it pads the attribute to the correct length. |
| 54/3 | 2026/09/14 02:40 | tool | grepper |
0mError:no matches Args: {
"Expression": "static inline int nla_put\\("
}Results: {
"error": "no matches"
} |
| 55/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 13306 output: 24 thoughts: 13 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Grasping for the `nla_put` Definition** Okay, so I need to understand this code. My immediate instinct is to pinpoint the exact definition of `nla_put`. It's a fundamental function, and I can't really proceed without knowing its precise signature and, ideally, its implementation details in this context. I'm going to run a `grep` to quickly locate the declaration. I'm hoping it's a straightforward search; no macros, no convoluted preprocessor shenanigans, just a clean, identifiable definition. I'm mentally parsing the likely include files – `<netlink/netlink.h>`, maybe something in the `<linux/nlattr.h>` realm? It's all about establishing a solid baseline for the rest of the analysis. Let's see what `grep` pulls up. |
| 56/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "int nla_put\\(struct sk_buff"
}Results: {
"Output": "include/net/netlink.h=566=void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);\ninclude/net/netlink.h:567:int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data);\ninclude/net/netlink.h-568-int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,\n--\nlib/nlattr.c=1082=EXPORT_SYMBOL(__nla_put_nohdr);\n--\nlib/nlattr.c-1093- */\nlib/nlattr.c:1094:int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data)\nlib/nlattr.c-1095-{\n"
} |
| 57/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 13766 output: 35 thoughts: 20 Thoughts: Here's a summary of my mental process: **Diving into the `nlattr.c` Source** Okay, time to get my hands dirty. I need to refresh my memory on the workings of `lib/nlattr.c`. Let's zero in on line 1094. Hopefully, I'll see something that jogs my memory, or even better, something that gives me a fresh perspective on whatever problem I'm currently wrestling with. I'm hoping this specific area holds the key, or at least a clue. Time to start digging! |
| 58/3 | 2026/09/14 02:41 | tool | read-file |
0mArgs:{
"File": "lib/nlattr.c",
"FirstLine": 1090,
"LineCount": 25
}Results: {
"Contents": "1090:\t *\n1091:\t * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store\n1092:\t * the attribute header and payload.\n1093:\t */\n1094:\tint nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data)\n1095:\t{\n1096:\t\tif (unlikely(skb_tailroom(skb) \u003c nla_total_size(attrlen)))\n1097:\t\t\treturn -EMSGSIZE;\n1098:\t\n1099:\t\t__nla_put(skb, attrtype, attrlen, data);\n1100:\t\treturn 0;\n1101:\t}\n1102:\tEXPORT_SYMBOL(nla_put);\n1103:\t\n1104:\t/**\n1105:\t * nla_put_64bit - Add a netlink attribute to a socket buffer and align it\n1106:\t * @skb: socket buffer to add attribute to\n1107:\t * @attrtype: attribute type\n1108:\t * @attrlen: length of attribute payload\n1109:\t * @data: head of attribute payload\n1110:\t * @padattr: attribute type for the padding\n1111:\t *\n1112:\t * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store\n1113:\t * the attribute header and payload.\n1114:\t */\n"
} |
| 59/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14342 output: 21 thoughts: 30 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience and written in the first person: **Diving into Netlink's Inner Workings** Okay, so I need to refresh my memory on the netlink internals, specifically how data is written. Let's start with a specific function. My immediate thought is to check out `__nla_put` in the `include/net/netlink.h` header file. I believe it's around line 1050, though I'll double-check that with the editor when I get there. This function is fundamental, as I recall, it’s responsible for the core logic of writing Netlink attributes, or NLA, into a Netlink message. I need to understand its exact purpose, how it handles lengths, what error conditions it checks for, and how it relates to the other NLA manipulation functions. Time to dig in and see the details of that core function. |
| 60/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "void __nla_put\\("
}Results: {
"Output": "include/net/netlink.h=561=void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen);\ninclude/net/netlink.h:562:void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,\ninclude/net/netlink.h-563-\t const void *data);\n--\nlib/nlattr.c=1023=EXPORT_SYMBOL(nla_reserve_nohdr);\n--\nlib/nlattr.c-1034- */\nlib/nlattr.c:1035:void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,\nlib/nlattr.c-1036-\t\t\t const void *data)\n"
} |
| 61/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14802 output: 35 thoughts: 19 Thoughts: Here's a summary of my thought process, as if I were the one thinking it: **Diving into `lib/nlattr.c` at Line 1035** Okay, time to get my hands dirty. I need to take a look at `lib/nlattr.c`, specifically around line 1035. I have a hunch about what's going on there, but a quick review is always a good idea before I start making any changes. This area handles a critical part of the Netlink attribute parsing process, and a bug in the attribute parsing logic can lead to all sorts of nasty security issues, or subtle corruption. Let's see what's actually happening at that location. Hopefully, my understanding of the Netlink message format and attribute structures will allow me to immediately identify the issue, or at least point me in the right direction. It's often the small, easily overlooked things that cause the most problems. Let's see what we've got. |
| 62/3 | 2026/09/14 02:41 | tool | read-file |
0mArgs:{
"File": "lib/nlattr.c",
"FirstLine": 1030,
"LineCount": 30
}Results: {
"Contents": "1030:\t * @data: head of attribute payload\n1031:\t *\n1032:\t * The caller is responsible to ensure that the skb provides enough\n1033:\t * tailroom for the attribute header and payload.\n1034:\t */\n1035:\tvoid __nla_put(struct sk_buff *skb, int attrtype, int attrlen,\n1036:\t\t\t\t const void *data)\n1037:\t{\n1038:\t\tstruct nlattr *nla;\n1039:\t\n1040:\t\tnla = __nla_reserve(skb, attrtype, attrlen);\n1041:\t\tmemcpy(nla_data(nla), data, attrlen);\n1042:\t}\n1043:\tEXPORT_SYMBOL(__nla_put);\n1044:\t\n1045:\t/**\n1046:\t * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it\n1047:\t * @skb: socket buffer to add attribute to\n1048:\t * @attrtype: attribute type\n1049:\t * @attrlen: length of attribute payload\n1050:\t * @data: head of attribute payload\n1051:\t * @padattr: attribute type for the padding\n1052:\t *\n1053:\t * The caller is responsible to ensure that the skb provides enough\n1054:\t * tailroom for the attribute header and payload.\n1055:\t */\n1056:\tvoid __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,\n1057:\t\t\t const void *data, int padattr)\n1058:\t{\n1059:\t\tstruct nlattr *nla;\n"
} |
| 63/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 15541 output: 24 thoughts: 11 Thoughts: Okay, here's my interpretation of "Let's see `__nla_reserve`" from an expert's perspective, presented as my own internal thought process: **Diving into `__nla_reserve`** Right, let's pull up `__nla_reserve`. Hmm, what's its purpose again? Ah yes, it's that little gem used within the Netlink attribute handling code. It's a critical piece, isn't it? Specifically, it's likely involved in reserving space within the Netlink attribute buffer, often to prevent buffer overflows during attribute insertion or modification. We're thinking dynamically sized attributes most likely. I need to refresh my memory on the edge cases related to allocation size versus the expected Netlink message size. I bet it's called internally by some of those helper macros for allocating attributes. We're talking low-level details. Let's see how it handles alignment too. I wonder if it directly deals with padding requirements to maintain attribute alignment. I better check the surrounding code for how it interacts with the attributes structure. Let's see what the implementation looks like, the error handling, and how it deals with potential memory allocation failures. Understanding the error handling is key, especially if we're dealing with a system running close to resource limits, which is often the case in embedded or high-performance networking scenarios. This could be relevant for potential buffer overflow vulnerabilities, or perhaps optimization. I should review its usage patterns within the relevant Netlink family code to get the full context. |
| 64/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "struct nlattr \\*__nla_reserve\\("
}Results: {
"Output": "include/net/netlink.h=553=int nla_strcmp(const struct nlattr *nla, const char *str);\ninclude/net/netlink.h:554:struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);\ninclude/net/netlink.h-555-struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype,\n--\nlib/nlattr.c=887=EXPORT_SYMBOL(nla_strcmp);\n--\nlib/nlattr.c-901- */\nlib/nlattr.c:902:struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)\nlib/nlattr.c-903-{\n"
} |
| 65/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 16111 output: 34 thoughts: 18 Thoughts: Here's a summary of my thought process, as if I were the one thinking it: **Diving into `lib/nlattr.c` at Line 902** Okay, time to get my hands dirty. I need to take a look at `lib/nlattr.c`, specifically around line 902. I'm assuming that's where the issue is likely to manifest itself, or at least where some critical logic related to the problem I'm investigating resides. Line numbers in C can be tricky, but this seems like a reasonable starting point based on the debugging information I've collected so far. I'll need to carefully parse the code around that area, understanding how the attributes are being handled and what variables are being manipulated. Hopefully, the code comments are descriptive enough, but I'm prepared to backtrack and trace function calls if necessary. It's time to dig in and see what nuances of the attribute handling are being glossed over. |
| 66/3 | 2026/09/14 02:41 | tool | read-file |
0mArgs:{
"File": "lib/nlattr.c",
"FirstLine": 900,
"LineCount": 25
}Results: {
"Contents": " 900:\t * tailroom for the attribute header and payload.\n 901:\t */\n 902:\tstruct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)\n 903:\t{\n 904:\t\tstruct nlattr *nla;\n 905:\t\n 906:\t\tnla = skb_put(skb, nla_total_size(attrlen));\n 907:\t\tnla-\u003enla_type = attrtype;\n 908:\t\tnla-\u003enla_len = nla_attr_size(attrlen);\n 909:\t\n 910:\t\tmemset((unsigned char *) nla + nla-\u003enla_len, 0, nla_padlen(attrlen));\n 911:\t\n 912:\t\treturn nla;\n 913:\t}\n 914:\tEXPORT_SYMBOL(__nla_reserve);\n 915:\t\n 916:\t/**\n 917:\t * __nla_reserve_64bit - reserve room for attribute on the skb and align it\n 918:\t * @skb: socket buffer to reserve room on\n 919:\t * @attrtype: attribute type\n 920:\t * @attrlen: length of attribute payload\n 921:\t * @padattr: attribute type for the padding\n 922:\t *\n 923:\t * Adds a netlink attribute header to a socket buffer and reserves\n 924:\t * room for the payload but does not copy it. It also ensure that this\n"
} |
| 67/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 16783 output: 25 thoughts: 90 Thoughts: **My Analysis of Netlink Attribute Padding** Okay, so I'm digging into how netlink attributes are handled, specifically focusing on padding. I see that `__nla_reserve` cleverly uses `memset` to explicitly zero out any padding bytes that might exist in a netlink attribute, using `nla_padlen(attrlen)`. That’s good; it ensures clean data. Now, I want to see if `nlmsg_put` also handles the header and any further padding correctly. It's crucial for maintaining data integrity and avoiding any unexpected values in the message. Let me go and check the implementation of `nlmsg_put` itself and make sure it has the behavior I expect. |
| 68/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "struct nlmsghdr \\*nlmsg_put\\("
}Results: {
"Output": "include/net/netlink.h=955=static inline u32 nlmsg_seq(const struct nlmsghdr *nlh)\n--\ninclude/net/netlink.h-994- */\ninclude/net/netlink.h:995:static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,\ninclude/net/netlink.h-996-\t\t\t\t\t int type, int payload, int flags)\n"
} |
| 69/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17180 output: 36 thoughts: 21 Thoughts: Here's a summary of my thought process, as requested: **Diving into Netlink Header Territory** Okay, time to get my hands dirty. I need to refresh my memory on the Netlink protocol's structure. I'm going to start by examining the `include/net/netlink.h` file. Specifically, I think the definitions around line 995 might be a good starting point. That section probably contains the definitions for the structures I'm interested in, or perhaps related macros that will unlock the details I need. Let's see what gems we can find there. This should be a good starting point for understanding a particular area that has been troubling me. |
| 70/3 | 2026/09/14 02:41 | tool | read-file |
0mArgs:{
"File": "include/net/netlink.h",
"FirstLine": 990,
"LineCount": 35
}Results: {
"Contents": " 990:\t * @flags: message flags\n 991:\t *\n 992:\t * Returns: NULL if the tailroom of the skb is insufficient to store\n 993:\t * the message header and payload.\n 994:\t */\n 995:\tstatic inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,\n 996:\t\t\t\t\t\t int type, int payload, int flags)\n 997:\t{\n 998:\t\tif (unlikely(skb_tailroom(skb) \u003c nlmsg_total_size(payload)))\n 999:\t\t\treturn NULL;\n1000:\t\n1001:\t\treturn __nlmsg_put(skb, portid, seq, type, payload, flags);\n1002:\t}\n1003:\t\n1004:\t/**\n1005:\t * nlmsg_append - Add more data to a nlmsg in a skb\n1006:\t * @skb: socket buffer to store message in\n1007:\t * @size: length of message payload\n1008:\t *\n1009:\t * Append data to an existing nlmsg, used when constructing a message\n1010:\t * with multiple fixed-format headers (which is rare).\n1011:\t * Returns: NULL if the tailroom of the skb is insufficient to store\n1012:\t * the extra payload.\n1013:\t */\n1014:\tstatic inline void *nlmsg_append(struct sk_buff *skb, u32 size)\n1015:\t{\n1016:\t\tif (unlikely(skb_tailroom(skb) \u003c NLMSG_ALIGN(size)))\n1017:\t\t\treturn NULL;\n1018:\t\n1019:\t\tif (NLMSG_ALIGN(size) - size)\n1020:\t\t\tmemset(skb_tail_pointer(skb) + size, 0,\n1021:\t\t\t NLMSG_ALIGN(size) - size);\n1022:\t\treturn __skb_put(skb, NLMSG_ALIGN(size));\n1023:\t}\n1024:\t\n"
} |
| 71/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17955 output: 26 thoughts: 11 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Analyzing `__nlmsg_put`** Alright, let's dive into `__nlmsg_put`. Hmm, just the function name alone suggests it’s a core component dealing with Netlink message construction. My initial thought is it's responsible for preparing the buffer before sending it on the wire. I bet it handles things like managing the buffer's size, potentially allocating more space if needed, and definitely setting up the Netlink header structure. I'm probably going to find it's intimately involved in laying out the various attributes that make up a Netlink message, right? I wonder if it also deals with alignment constraints. Netlink, being a protocol designed for efficient kernel-user communication, usually has specific alignment requirements for data structures to avoid performance bottlenecks on different architectures. I'd expect `__nlmsg_put` to either enforce those alignments directly or call another function to do so. I'm curious about error handling too. How does it deal with buffer overflows? Does it return an error code or just silently truncate the message? Or does it potentially trigger an Oops? I hope it's well-designed and robust because Netlink is critical for so many system functions. I need to see it in context, but I am betting it deals with the core of building the actual messages. I should also check how it plays with something like `nla_put` and the other Netlink helpers. Is it the primary message builder, with the other functions building the payload? Or is it used more as a helper to set up the necessary headers and basic message structure? My gut tells me it's the latter. Let's dig in and see. |
| 72/3 | 2026/09/14 02:41 | tool | grepper |
0mError:no matches Args: {
"Expression": "struct nlmsghdr \\*__nlmsg_put\\("
}Results: {
"error": "no matches"
} |
| 73/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18381 output: 33 thoughts: 23 Thoughts: **Locating `__nlmsg_put`** Okay, so I need to find the definition or implementation of `__nlmsg_put`. Based on past experience with the kernel, it's highly likely this function is involved in Netlink message construction. Therefore, my first instinct is to look in the `include/net/` directory, specifically within the Netlink-related header files. That's usually the place for declarations and function prototypes that are fundamental to that subsystem. If it's not in the include files, the next place I'll check will be the `lib/` directory. Sometimes common utility functions end up there, especially if they are designed to be shared across various parts of the kernel. This is my starting point, and I expect I'll find it fairly quickly. |
| 74/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "__nlmsg_put",
"PathPrefix": "include/net/netlink.h"
}Results: {
"Output": "include/net/netlink.h=995=static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,\n--\ninclude/net/netlink.h-1000-\ninclude/net/netlink.h:1001:\treturn __nlmsg_put(skb, portid, seq, type, payload, flags);\ninclude/net/netlink.h-1002-}\n"
} |
| 75/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18731 output: 36 thoughts: 24 Thoughts: Here's my attempt at summarizing the thought process, as if I were thinking it: **Locating Critical Code in netlink.h** Okay, time to zero in on something specific. I need to examine a portion of the `include/net/netlink.h` file, specifically around line 970. I'm not going in blind; I have an idea about what might be there, based on the context of the problem I'm trying to solve. But I need to refresh my memory and pinpoint the relevant definitions or structures. Let’s navigate to that location in the code and see what we can find. I’m thinking there might be something related to… well, let's just go look. Ten lines either side of line 970 should give me a good enough overview of the surrounding code for now. |
| 76/3 | 2026/09/14 02:41 | tool | read-file |
0mArgs:{
"File": "include/net/netlink.h",
"FirstLine": 960,
"LineCount": 35
}Results: {
"Contents": " 960:\t/**\n 961:\t * nlmsg_for_each_attr - iterate over a stream of attributes\n 962:\t * @pos: loop counter, set to current attribute\n 963:\t * @nlh: netlink message header\n 964:\t * @hdrlen: length of family specific header\n 965:\t * @rem: initialized to len, holds bytes currently remaining in stream\n 966:\t */\n 967:\t#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \\\n 968:\t\tnla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \\\n 969:\t\t\t\t nlmsg_attrlen(nlh, hdrlen), rem)\n 970:\t\n 971:\t/**\n 972:\t * nlmsg_for_each_attr_type - iterate over a stream of attributes\n 973:\t * @pos: loop counter, set to the current attribute\n 974:\t * @type: required attribute type for @pos\n 975:\t * @nlh: netlink message header\n 976:\t * @hdrlen: length of the family specific header\n 977:\t * @rem: initialized to len, holds bytes currently remaining in stream\n 978:\t */\n 979:\t#define nlmsg_for_each_attr_type(pos, type, nlh, hdrlen, rem) \\\n 980:\t\tnlmsg_for_each_attr(pos, nlh, hdrlen, rem) \\\n 981:\t\t\tif (nla_type(pos) == type)\n 982:\t\n 983:\t/**\n 984:\t * nlmsg_put - Add a new netlink message to an skb\n 985:\t * @skb: socket buffer to store message in\n 986:\t * @portid: netlink PORTID of requesting application\n 987:\t * @seq: sequence number of message\n 988:\t * @type: message type\n 989:\t * @payload: length of message payload\n 990:\t * @flags: message flags\n 991:\t *\n 992:\t * Returns: NULL if the tailroom of the skb is insufficient to store\n 993:\t * the message header and payload.\n 994:\t */\n"
} |
| 77/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19578 output: 19 thoughts: 15 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Tracing the Definition of `__nlmsg_put`** Okay, so I need to understand where `__nlmsg_put` is defined. This likely means I'm dealing with a netlink-related function, probably kernel-side. My first instinct is to use the standard tools; `grep` or `cscope`, or even `git grep` if I'm working with a version-controlled kernel tree, should turn it up pretty quickly. I'd start with a broad search within the kernel source itself, or if I know the general netlink subsystem area, I'd narrow the scope from the outset. I'll need to remember to check for any inline definitions, macros, or static inline functions that might be involved too. Let's see what we can find! |
| 78/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "__nlmsg_put"
}Results: {
"Output": "drivers/scsi/scsi_transport_iscsi.c=2543=int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,\n--\ndrivers/scsi/scsi_transport_iscsi.c-2565-\ndrivers/scsi/scsi_transport_iscsi.c:2566:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2567-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2581=int iscsi_offload_mesg(struct Scsi_Host *shost,\n--\ndrivers/scsi/scsi_transport_iscsi.c-2595-\ndrivers/scsi/scsi_transport_iscsi.c:2596:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2597-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2616=void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)\n--\ndrivers/scsi/scsi_transport_iscsi.c-2660-\ndrivers/scsi/scsi_transport_iscsi.c:2661:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2662-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2676=void iscsi_conn_login_event(struct iscsi_cls_conn *conn,\n--\ndrivers/scsi/scsi_transport_iscsi.c-2695-\ndrivers/scsi/scsi_transport_iscsi.c:2696:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2697-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2710=void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,\n--\ndrivers/scsi/scsi_transport_iscsi.c-2725-\ndrivers/scsi/scsi_transport_iscsi.c:2726:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2727-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2741=void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,\n--\ndrivers/scsi/scsi_transport_iscsi.c-2755-\ndrivers/scsi/scsi_transport_iscsi.c:2756:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2757-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2771=iscsi_if_send_reply(u32 portid, int type, void *payload, int size)\n--\ndrivers/scsi/scsi_transport_iscsi.c-2782-\ndrivers/scsi/scsi_transport_iscsi.c:2783:\tnlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2784-\tmemcpy(nlmsg_data(nlh), payload, size);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2789=iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)\n--\ndrivers/scsi/scsi_transport_iscsi.c-2821-\ndrivers/scsi/scsi_transport_iscsi.c:2822:\t\tnlhstat = __nlmsg_put(skbstat, 0, 0, 0,\ndrivers/scsi/scsi_transport_iscsi.c-2823-\t\t\t\t (len - sizeof(*nlhstat)), 0);\n--\ndrivers/scsi/scsi_transport_iscsi.c=2858=int iscsi_session_event(struct iscsi_cls_session *session,\n--\ndrivers/scsi/scsi_transport_iscsi.c-2880-\ndrivers/scsi/scsi_transport_iscsi.c:2881:\tnlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);\ndrivers/scsi/scsi_transport_iscsi.c-2882-\tev = nlmsg_data(nlh);\n--\ndrivers/scsi/scsi_transport_iscsi.c=3298=iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)\n--\ndrivers/scsi/scsi_transport_iscsi.c-3337-\ndrivers/scsi/scsi_transport_iscsi.c:3338:\t\tnlhchap = __nlmsg_put(skbchap, 0, 0, 0,\ndrivers/scsi/scsi_transport_iscsi.c-3339-\t\t\t\t (len - sizeof(*nlhchap)), 0);\n--\ndrivers/scsi/scsi_transport_iscsi.c=3703=iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)\n--\ndrivers/scsi/scsi_transport_iscsi.c-3741-\ndrivers/scsi/scsi_transport_iscsi.c:3742:\t\tnlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,\ndrivers/scsi/scsi_transport_iscsi.c-3743-\t\t\t\t (len - sizeof(*nlhhost_stats)), 0);\n--\ninclude/linux/netlink.h=317=struct nlmsghdr *\ninclude/linux/netlink.h:318:__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags);\ninclude/linux/netlink.h-319-\n--\ninclude/net/netlink.h=995=static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,\n--\ninclude/net/netlink.h-1000-\ninclude/net/netlink.h:1001:\treturn __nlmsg_put(skb, portid, seq, type, payload, flags);\ninclude/net/netlink.h-1002-}\n--\nnet/netlink/af_netlink.c=2144=struct nlmsghdr *\nnet/netlink/af_netlink.c:2145:__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags)\nnet/netlink/af_netlink.c-2146-{\n--\nnet/netlink/af_netlink.c-2159-}\nnet/netlink/af_netlink.c:2160:EXPORT_SYMBOL(__nlmsg_put);\nnet/netlink/af_netlink.c-2161-\n"
} |
| 79/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21943 output: 40 thoughts: 24 Thoughts: Here's a summary of my thought process, as requested: **Diving into Netlink: A Quick Diagnostic** Okay, so I'm trying to track down something specific, and it's pointing me towards the Netlink subsystem. Immediately, my mental map kicks in, and I know where to start looking. I'm thinking, "Right, `net/netlink/af_netlink.c` is the place to be, that's where the core AF_NETLINK functionality resides." I want to zero in on a specific part, so I'm keying in on line 2145. I'm running through my mental checklists of common issues around that area, anticipating what I might find. Let's see what that line tells me... this should be interesting. |
| 80/3 | 2026/09/14 02:41 | tool | read-file |
0mArgs:{
"File": "net/netlink/af_netlink.c",
"FirstLine": 2144,
"LineCount": 20
}Results: {
"Contents": "2144:\tstruct nlmsghdr *\n2145:\t__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags)\n2146:\t{\n2147:\t\tstruct nlmsghdr *nlh;\n2148:\t\tint size = nlmsg_msg_size(len);\n2149:\t\n2150:\t\tnlh = skb_put(skb, NLMSG_ALIGN(size));\n2151:\t\tnlh-\u003enlmsg_type = type;\n2152:\t\tnlh-\u003enlmsg_len = size;\n2153:\t\tnlh-\u003enlmsg_flags = flags;\n2154:\t\tnlh-\u003enlmsg_pid = portid;\n2155:\t\tnlh-\u003enlmsg_seq = seq;\n2156:\t\tif (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)\n2157:\t\t\tmemset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size);\n2158:\t\treturn nlh;\n2159:\t}\n2160:\tEXPORT_SYMBOL(__nlmsg_put);\n2161:\t\n2162:\tstatic size_t\n2163:\tnetlink_ack_tlv_len(struct netlink_sock *nlk, int err,\n"
} |
| 81/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22551 output: 24 thoughts: 574 Thoughts: **My Thoughts on `ifaddrmsg` and Attribute Handling** Okay, so `__nlmsg_put` zeroes the padding, which is good. Looking at how `struct ifaddrmsg` is initialized, it seems pretty straightforward: `ifa_family`, `ifa_prefixlen`, `ifa_flags`, `ifa_scope`, and `ifa_index` are all set. The structure itself is 8 bytes, and with the `u8`, `u8`, `u8`, `u8`, `u32` layout, there's no padding within the struct itself. And since that size is 8 and the header is already 16 (assumed), 16+8=24 which is still 4-byte aligned (due to `NLMSG_ALIGN`). No alignment padding issues to worry about there. But wait a minute... what about the *attributes* that get added after the `ifaddrmsg` struct? Specifically, the code uses `nla_put_s32`, `nla_put`, and `nla_put_u32`. This raises a few questions. The code does not check if the allocation of the `ha` is valid. My immediate concern is: Is `dev->addr_len` always initialized and valid for *all* network devices? That's a critical dependency here. I need to trace back where `dev->addr_len` comes from and how devices set it up to be certain. Furthermore, can `dev->addr_len` potentially be larger than the allocated size of `ha->addr`? That could lead to a buffer overflow, depending on how `nla_put` handles it. My brain then jumps to the multicast address handling... in functions like `dev_mc_add` and similar. How is `ha` (likely referring to a hardware address) actually added? I need to figure out how entries are added to `dev->mc`. I'll search for uses of `netdev_for_each_mc_addr` or other functions related to how multicast addresses are managed and added to the network device structures. These are all things that seem like potential problems and should be addressed. |
| 82/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "netdev_for_each_mc_addr"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 1306 lines.\nUse more precise expression if possible.\n\n.clang-format=71=ForEachMacros:\n--\n.clang-format-600- - 'netdev_for_each_lower_private_rcu'\n.clang-format:601: - 'netdev_for_each_mc_addr'\n.clang-format-602- - 'netdev_for_each_synced_mc_addr'\n--\ndrivers/infiniband/ulp/ipoib/ipoib_multicast.c=864=void ipoib_mcast_restart_task(struct work_struct *work)\n--\ndrivers/infiniband/ulp/ipoib/ipoib_multicast.c-896-\t/* Mark all of the entries that are found or don't exist */\ndrivers/infiniband/ulp/ipoib/ipoib_multicast.c:897:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/infiniband/ulp/ipoib/ipoib_multicast.c-898-\t\tunion ib_gid mgid;\n--\ndrivers/media/dvb-core/dvb_net.c=1219=static void wq_set_multicast_list (struct work_struct *work)\n--\ndrivers/media/dvb-core/dvb_net.c-1243-\ndrivers/media/dvb-core/dvb_net.c:1244:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/media/dvb-core/dvb_net.c-1245-\t\t\tdvb_set_mc_filter(dev, ha-\u003eaddr);\n--\ndrivers/net/ethernet/3com/typhoon.c=874=typhoon_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/3com/typhoon.c-891-\t\tmemset(mc_filter, 0, sizeof(mc_filter));\ndrivers/net/ethernet/3com/typhoon.c:892:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/3com/typhoon.c-893-\t\t\tint bit = ether_crc(ETH_ALEN, ha-\u003eaddr) \u0026 0x3f;\n--\ndrivers/net/ethernet/8390/lib8390.c=881=static inline void make_mc_bits(u8 *bits, struct net_device *dev)\n--\ndrivers/net/ethernet/8390/lib8390.c-884-\ndrivers/net/ethernet/8390/lib8390.c:885:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/8390/lib8390.c-886-\t\tu32 crc = ether_crc(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/actions/owl-emac.c=1104=static void owl_emac_set_multicast(struct net_device *netdev, int count)\n--\ndrivers/net/ethernet/actions/owl-emac.c-1114-\ndrivers/net/ethernet/actions/owl-emac.c:1115:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/actions/owl-emac.c-1116-\t\tif (!is_multicast_ether_addr(ha-\u003eaddr))\n--\ndrivers/net/ethernet/adaptec/starfire.c=1763=static void set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/adaptec/starfire.c-1784-\t\tconst __be16 *eaddrs;\ndrivers/net/ethernet/adaptec/starfire.c:1785:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/adaptec/starfire.c-1786-\t\t\teaddrs = (__be16 *) ha-\u003eaddr;\n--\ndrivers/net/ethernet/adaptec/starfire.c-1805-\t\tmemset(mc_filter, 0, sizeof(mc_filter));\ndrivers/net/ethernet/adaptec/starfire.c:1806:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/adaptec/starfire.c-1807-\t\t\t/* The chip uses the upper 9 CRC bits\n--\ndrivers/net/ethernet/aeroflex/greth.c=1043=static void greth_set_hash_filter(struct net_device *dev)\n--\ndrivers/net/ethernet/aeroflex/greth.c-1052-\ndrivers/net/ethernet/aeroflex/greth.c:1053:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/aeroflex/greth.c-1054-\t\tbitnr = greth_hash_get_index(ha-\u003eaddr);\n--\ndrivers/net/ethernet/agere/et131x.c=3738=static void et131x_multicast(struct net_device *netdev)\n--\ndrivers/net/ethernet/agere/et131x.c-3778-\ti = 0;\ndrivers/net/ethernet/agere/et131x.c:3779:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/agere/et131x.c-3780-\t\tif (i == NIC_MAX_MCAST_LIST)\n--\ndrivers/net/ethernet/alacritech/slicoss.c=307=static void slic_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/alacritech/slicoss.c-323-\ndrivers/net/ethernet/alacritech/slicoss.c:324:\t\tnetdev_for_each_mc_addr(hwaddr, dev) {\ndrivers/net/ethernet/alacritech/slicoss.c-325-\t\t\tslic_set_mcast_bit(\u0026mcmask, hwaddr-\u003eaddr);\n--\ndrivers/net/ethernet/altera/altera_tse_main.c=796=static void altera_tse_set_mcfilter(struct net_device *dev)\n--\ndrivers/net/ethernet/altera/altera_tse_main.c-805-\ndrivers/net/ethernet/altera/altera_tse_main.c:806:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/altera/altera_tse_main.c-807-\t\tunsigned int hash = 0;\n--\ndrivers/net/ethernet/amd/7990.c=598=static void lance_load_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/7990.c-616-\t/* Add addresses */\ndrivers/net/ethernet/amd/7990.c:617:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/amd/7990.c-618-\t\tcrc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/amd/a2065.c=579=static void lance_load_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/a2065.c-597-\t/* Add addresses */\ndrivers/net/ethernet/amd/a2065.c:598:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/amd/a2065.c-599-\t\tcrc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/amd/amd8111e.c=1317=static void amd8111e_set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/amd8111e.c-1349-\tmc_filter[1] = mc_filter[0] = 0;\ndrivers/net/ethernet/amd/amd8111e.c:1350:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/amd/amd8111e.c-1351-\t\tbit_num = (ether_crc_le(ETH_ALEN, ha-\u003eaddr) \u003e\u003e 26) \u0026 0x3f;\n--\ndrivers/net/ethernet/amd/au1000_eth.c=1020=static void au1000_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/au1000_eth.c-1038-\t\tmc_filter[1] = mc_filter[0] = 0;\ndrivers/net/ethernet/amd/au1000_eth.c:1039:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/amd/au1000_eth.c-1040-\t\t\tset_bit(ether_crc(ETH_ALEN, ha-\u003eaddr)\u003e\u003e26,\n--\ndrivers/net/ethernet/amd/declance.c=945=static void lance_load_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/declance.c-966-\t/* Add addresses */\ndrivers/net/ethernet/amd/declance.c:967:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/amd/declance.c-968-\t\tcrc = ether_crc_le(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/amd/pcnet32.c=2681=static void pcnet32_load_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/pcnet32.c-2705-\t/* Add addresses */\ndrivers/net/ethernet/amd/pcnet32.c:2706:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/amd/pcnet32.c-2707-\t\tcrc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/amd/sunlance.c=1159=static void lance_load_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/amd/sunlance.c-1185-\t/* Add addresses */\ndrivers/net/ethernet/amd/sunlance.c:1186:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/amd/sunlance.c-1187-\t\tcrc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c=927=static void xgbe_set_mac_addn_addrs(struct xgbe_prv_data *pdata)\n--\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c-947-\t\t} else {\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c:948:\t\t\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c-949-\t\t\t\txgbe_set_mac_reg(pdata, ha, \u0026mac_reg);\n--\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c=960=static void xgbe_set_mac_hash_table(struct xgbe_prv_data *pdata)\n--\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c-980-\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c:981:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/amd/xgbe/xgbe-dev.c-982-\t\tcrc = bitrev32(~crc32_le(~0, ha-\u003eaddr, ETH_ALEN));\n--\ndrivers/net/ethernet/apple/bmac.c=907=static void bmac_set_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/apple/bmac.c-937-\t\t} else {\ndrivers/net/ethernet/apple/bmac.c:938:\t\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/apple/bmac.c-939-\t\t\t\tbmac_addhash(bp, ha-\u003eaddr);\n--\ndrivers/net/ethernet/apple/bmac.c=951=static void bmac_set_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/apple/bmac.c-972-\ndrivers/net/ethernet/apple/bmac.c:973:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/apple/bmac.c-974-\t\t\tcrc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/apple/mace.c=587=static void mace_set_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/apple/mace.c-608-\t\tmulticast_filter[i] = 0;\ndrivers/net/ethernet/apple/mace.c:609:\t netdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/apple/mace.c-610-\t crc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/apple/macmace.c=483=static void mace_set_multicast(struct net_device *dev)\n--\ndrivers/net/ethernet/apple/macmace.c-508-\t\t\t\tmulticast_filter[i] = 0;\ndrivers/net/ethernet/apple/macmace.c:509:\t\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/apple/macmace.c-510-\t\t\t\tcrc = ether_crc_le(6, ha-\u003eaddr);\n--\ndrivers/net/ethernet/aquantia/atlantic/aq_nic.c=973=int aq_nic_set_multicast_list(struct aq_nic_s *self, struct net_device *ndev)\n--\ndrivers/net/ethernet/aquantia/atlantic/aq_nic.c-995-\t\t} else {\ndrivers/net/ethernet/aquantia/atlantic/aq_nic.c:996:\t\t\tnetdev_for_each_mc_addr(ha, ndev) {\ndrivers/net/ethernet/aquantia/atlantic/aq_nic.c-997-\t\t\t\tether_addr_copy(self-\u003emc_list.ar[i++],\n--\ndrivers/net/ethernet/arc/emac_main.c=514=static void arc_emac_set_rx_mode(struct net_device *ndev)\n--\ndrivers/net/ethernet/arc/emac_main.c-530-\ndrivers/net/ethernet/arc/emac_main.c:531:\t\t\tnetdev_for_each_mc_addr(ha, ndev) {\ndrivers/net/ethernet/arc/emac_main.c-532-\t\t\t\tbit = ether_crc_le(ETH_ALEN, ha-\u003eaddr) \u003e\u003e 26;\n--\ndrivers/net/ethernet/asix/ax88796c_main.c=91=static void ax88796c_set_hw_multicast(struct net_device *ndev)\n--\ndrivers/net/ethernet/asix/ax88796c_main.c-113-\ndrivers/net/ethernet/asix/ax88796c_main.c:114:\t\tnetdev_for_each_mc_addr(ha, ndev) {\ndrivers/net/ethernet/asix/ax88796c_main.c-115-\t\t\tcrc_bits = ether_crc(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/atheros/alx/main.c=568=static void __alx_set_rx_mode(struct net_device *netdev)\n--\ndrivers/net/ethernet/atheros/alx/main.c-575-\tif (!(netdev-\u003eflags \u0026 IFF_ALLMULTI)) {\ndrivers/net/ethernet/atheros/alx/main.c:576:\t\tnetdev_for_each_mc_addr(ha, netdev)\ndrivers/net/ethernet/atheros/alx/main.c-577-\t\t\talx_add_mc_addr(hw, ha-\u003eaddr, mc_hash);\n--\ndrivers/net/ethernet/atheros/atl1c/atl1c_main.c=387=static void atl1c_set_multi(struct net_device *netdev)\n--\ndrivers/net/ethernet/atheros/atl1c/atl1c_main.c-413-\t/* comoute mc addresses' hash value ,and put it into hash table */\ndrivers/net/ethernet/atheros/atl1c/atl1c_main.c:414:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/atheros/atl1c/atl1c_main.c-415-\t\thash_value = atl1c_hash_mc_addr(hw, ha-\u003eaddr);\n--\ndrivers/net/ethernet/atheros/atl1e/atl1e_main.c=266=static void atl1e_set_multi(struct net_device *netdev)\n--\ndrivers/net/ethernet/atheros/atl1e/atl1e_main.c-292-\t/* comoute mc addresses' hash value ,and put it into hash table */\ndrivers/net/ethernet/atheros/atl1e/atl1e_main.c:293:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/atheros/atl1e/atl1e_main.c-294-\t\thash_value = atl1e_hash_mc_addr(hw, ha-\u003eaddr);\n--\ndrivers/net/ethernet/atheros/atlx/atl2.c=115=static void atl2_set_multi(struct net_device *netdev)\n--\ndrivers/net/ethernet/atheros/atlx/atl2.c-140-\t/* comoute mc addresses' hash value ,and put it into hash table */\ndrivers/net/ethernet/atheros/atlx/atl2.c:141:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/atheros/atlx/atl2.c-142-\t\thash_value = atl2_hash_mc_addr(hw, ha-\u003eaddr);\n--\ndrivers/net/ethernet/atheros/atlx/atlx.c=113=static void atlx_set_multi(struct net_device *netdev)\n--\ndrivers/net/ethernet/atheros/atlx/atlx.c-137-\t/* compute mc addresses' hash value ,and put it into hash table */\ndrivers/net/ethernet/atheros/atlx/atlx.c:138:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/atheros/atlx/atlx.c-139-\t\thash_value = atlx_hash_mc_addr(hw, ha-\u003eaddr);\n--\ndrivers/net/ethernet/broadcom/asp2/bcmasp_intf.c=81=static void bcmasp_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/asp2/bcmasp_intf.c-105-\ndrivers/net/ethernet/broadcom/asp2/bcmasp_intf.c:106:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/asp2/bcmasp_intf.c-107-\t\t\tret = bcmasp_set_en_mda_filter(intf, ha-\u003eaddr, mask);\n--\ndrivers/net/ethernet/broadcom/b44.c=1700=static int __b44_load_mcast(struct b44 *bp, struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/b44.c-1706-\ti = 0;\ndrivers/net/ethernet/broadcom/b44.c:1707:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/b44.c-1708-\t\tif (i == num_ents)\n--\ndrivers/net/ethernet/broadcom/bcm63xx_enet.c=690=static void bcm_enet_set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/bcm63xx_enet.c-720-\ti = 0;\ndrivers/net/ethernet/broadcom/bcm63xx_enet.c:721:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/bcm63xx_enet.c-722-\t\tu8 *dmi_addr;\n--\ndrivers/net/ethernet/broadcom/bnx2.c=3589=bnx2_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/bnx2.c-3628-\ndrivers/net/ethernet/broadcom/bnx2.c:3629:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/bnx2.c-3630-\t\t\tcrc = ether_crc_le(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c=12539=static int bnx2x_init_mcast_macs_list(struct bnx2x *bp,\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-12549-\tINIT_LIST_HEAD(\u0026p-\u003emcast_list);\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c:12550:\tnetdev_for_each_mc_addr(ha, bp-\u003edev) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c-12551-\t\tif (!offset) {\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c=868=int bnx2x_vfpf_set_mcast(struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c-896-\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c:897:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c-898-\t\tDP(NETIF_MSG_IFUP, \"Adding mcast MAC: %pM\\n\",\n--\ndrivers/net/ethernet/broadcom/genet/bcmgenet.c=3561=static void bcmgenet_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/genet/bcmgenet.c-3606-\t/* Multicast */\ndrivers/net/ethernet/broadcom/genet/bcmgenet.c:3607:\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/broadcom/genet/bcmgenet.c-3608-\t\tbcmgenet_set_mdf_addr(priv, ha-\u003eaddr, \u0026i);\n--\ndrivers/net/ethernet/broadcom/sb1250-mac.c=2056=static void sbmac_setmulti(struct sbmac_softc *sc)\n--\ndrivers/net/ethernet/broadcom/sb1250-mac.c-2109-\tidx = 1;\t\t/* skip station address */\ndrivers/net/ethernet/broadcom/sb1250-mac.c:2110:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/sb1250-mac.c-2111-\t\tif (idx == MAC_ADDR_COUNT)\n--\ndrivers/net/ethernet/broadcom/tg3.c=9820=static void __tg3_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/broadcom/tg3.c-9852-\ndrivers/net/ethernet/broadcom/tg3.c:9853:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/broadcom/tg3.c-9854-\t\t\tcrc = calc_crc(ha-\u003eaddr, ETH_ALEN);\n--\ndrivers/net/ethernet/brocade/bna/bnad.c=1847=bnad_netdev_mc_list_get(struct net_device *netdev, u8 *mc_list)\n--\ndrivers/net/ethernet/brocade/bna/bnad.c-1851-\ndrivers/net/ethernet/brocade/bna/bnad.c:1852:\tnetdev_for_each_mc_addr(mc_addr, netdev) {\ndrivers/net/ethernet/brocade/bna/bnad.c-1853-\t\tether_addr_copy(\u0026mc_list[i * ETH_ALEN], \u0026mc_addr-\u003eaddr[0]);\n--\ndrivers/net/ethernet/cadence/macb_main.c=3074=static void macb_sethashtable(struct net_device *netdev)\n--\ndrivers/net/ethernet/cadence/macb_main.c-3083-\ndrivers/net/ethernet/cadence/macb_main.c:3084:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/cadence/macb_main.c-3085-\t\tbitnr = hash_get_index(ha-\u003eaddr);\n--\ndrivers/net/ethernet/calxeda/xgmac.c=1268=static void xgmac_set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/calxeda/xgmac.c-1315-\t}\ndrivers/net/ethernet/calxeda/xgmac.c:1316:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/calxeda/xgmac.c-1317-\t\tif (use_hash) {\n--\ndrivers/net/ethernet/cavium/liquidio/lio_main.c=1944=static void liquidio_set_mcast_list(struct net_device *netdev)\n--\ndrivers/net/ethernet/cavium/liquidio/lio_main.c-1967-\tmc = \u0026nctrl.udd[0];\ndrivers/net/ethernet/cavium/liquidio/lio_main.c:1968:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/cavium/liquidio/lio_main.c-1969-\t\t*mc = 0;\n--\ndrivers/net/ethernet/cavium/liquidio/lio_vf_main.c=1070=static void liquidio_set_mcast_list(struct net_device *netdev)\n--\ndrivers/net/ethernet/cavium/liquidio/lio_vf_main.c-1092-\tmc = \u0026nctrl.udd[0];\ndrivers/net/ethernet/cavium/liquidio/lio_vf_main.c:1093:\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/cavium/liquidio/lio_vf_main.c-1094-\t\t*mc = 0;\n--\ndrivers/net/ethernet/cavium/octeon/octeon_mgmt.c=561=static void octeon_mgmt_set_rx_filtering(struct net_device *netdev)\n--\ndrivers/net/ethernet/cavium/octeon/octeon_mgmt.c-600-\tif (multicast_mode == 0) {\ndrivers/net/ethernet/cavium/octeon/octeon_mgmt.c:601:\t\tnetdev_for_each_mc_addr(ha, netdev)\ndrivers/net/ethernet/cavium/octeon/octeon_mgmt.c-602-\t\t\tocteon_mgmt_cam_state_add(\u0026cam_state, ha-\u003eaddr);\n--\ndrivers/net/ethernet/chelsio/cxgb/pm3393.c=336=static int pm3393_set_rx_mode(struct cmac *cmac, struct t1_rx_mode *rm)\n--\ndrivers/net/ethernet/chelsio/cxgb/pm3393.c-367-\ndrivers/net/ethernet/chelsio/cxgb/pm3393.c:368:\t\tnetdev_for_each_mc_addr(ha, t1_get_netdev(rm)) {\ndrivers/net/ethernet/chelsio/cxgb/pm3393.c-369-\t\t\t/* bit[23:28] */\n--\ndrivers/net/ethernet/chelsio/cxgb3/xgmac.c=300=int t3_mac_set_rx_mode(struct cmac *mac, struct net_device *dev)\n--\ndrivers/net/ethernet/chelsio/cxgb3/xgmac.c-317-\t\thash_lo = hash_hi = 0;\ndrivers/net/ethernet/chelsio/cxgb3/xgmac.c:318:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/chelsio/cxgb3/xgmac.c-319-\t\t\tif (exact_addr_idx \u003c EXACT_ADDR_FILTERS)\n--\ndrivers/net/ethernet/cortina/gemini.c=1925=static void gmac_set_rx_mode(struct net_device *netdev)\n--\ndrivers/net/ethernet/cortina/gemini.c-1948-\t} else {\ndrivers/net/ethernet/cortina/gemini.c:1949:\t\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/cortina/gemini.c-1950-\t\t\tbit_nr = ~crc32_le(~0, ha-\u003eaddr, ETH_ALEN) \u0026 0x3f;\n--\ndrivers/net/ethernet/davicom/dm9000.c=836=dm9000_hash_table_unlocked(struct net_device *dev)\n--\ndrivers/net/ethernet/davicom/dm9000.c-856-\t/* the multicast address in Hash Table : 64 bits */\ndrivers/net/ethernet/davicom/dm9000.c:857:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/davicom/dm9000.c-858-\t\thash_val = ether_crc_le(6, ha-\u003eaddr) \u0026 0x3f;\n--\ndrivers/net/ethernet/davicom/dm9051.c=1031=static void dm9051_set_rx_mode(struct net_device *ndev)\n--\ndrivers/net/ethernet/davicom/dm9051.c-1060-\t/* the multicast address in Hash Table : 64 bits */\ndrivers/net/ethernet/davicom/dm9051.c:1061:\tnetdev_for_each_mc_addr(ha, ndev) {\ndrivers/net/ethernet/davicom/dm9051.c-1062-\t\thash_val = ether_crc_le(ETH_ALEN, ha-\u003eaddr) \u0026 GENMASK(5, 0);\n--\ndrivers/net/ethernet/dec/tulip/de2104x.c=662=static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/de2104x.c-672-\t/* This should work on big-endian machines as well. */\ndrivers/net/ethernet/dec/tulip/de2104x.c:673:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/de2104x.c-674-\t\tint index = ether_crc_le(ETH_ALEN, ha-\u003eaddr) \u0026 0x1ff;\n--\ndrivers/net/ethernet/dec/tulip/de2104x.c=692=static void build_setup_frame_perfect(u16 *setup_frm, struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/de2104x.c-699-\t 16 address perfect filtering of the Tulip. */\ndrivers/net/ethernet/dec/tulip/de2104x.c:700:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/de2104x.c-701-\t\teaddrs = (u16 *) ha-\u003eaddr;\n--\ndrivers/net/ethernet/dec/tulip/dmfe.c=1436=static void dm9132_id_table(struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/dmfe.c-1456-\t/* the multicast address in Hash Table : 64 bits */\ndrivers/net/ethernet/dec/tulip/dmfe.c:1457:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/dmfe.c-1458-\t\tu32 hash_val = cal_CRC((char *)ha-\u003eaddr, 6, 0) \u0026 0x3f;\n--\ndrivers/net/ethernet/dec/tulip/dmfe.c=1474=static void send_filter_frame(struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/dmfe.c-1499-\t/* fit the multicast address */\ndrivers/net/ethernet/dec/tulip/dmfe.c:1500:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/dmfe.c-1501-\t\taddrptr = (u16 *) ha-\u003eaddr;\n--\ndrivers/net/ethernet/dec/tulip/tulip_core.c=999=static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/tulip_core.c-1009-\t/* This should work on big-endian machines as well. */\ndrivers/net/ethernet/dec/tulip/tulip_core.c:1010:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/tulip_core.c-1011-\t\tint index = ether_crc_le(ETH_ALEN, ha-\u003eaddr) \u0026 0x1ff;\n--\ndrivers/net/ethernet/dec/tulip/tulip_core.c=1028=static void build_setup_frame_perfect(u16 *setup_frm, struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/tulip_core.c-1035-\t 16 address perfect filtering of the Tulip. */\ndrivers/net/ethernet/dec/tulip/tulip_core.c:1036:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/tulip_core.c-1037-\t\teaddrs = (u16 *) ha-\u003eaddr;\n--\ndrivers/net/ethernet/dec/tulip/tulip_core.c=1054=static void set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/tulip_core.c-1081-\t\t\tint filterbit;\ndrivers/net/ethernet/dec/tulip/tulip_core.c:1082:\t\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/tulip_core.c-1083-\t\t\t\tif (tp-\u003eflags \u0026 COMET_MAC_ADDR)\n--\ndrivers/net/ethernet/dec/tulip/uli526x.c=1343=static void send_filter_frame(struct net_device *dev, int mc_cnt)\n--\ndrivers/net/ethernet/dec/tulip/uli526x.c-1369-\t/* fit the multicast address */\ndrivers/net/ethernet/dec/tulip/uli526x.c:1370:\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/uli526x.c-1371-\t\taddrptr = (u16 *) ha-\u003eaddr;\n--\ndrivers/net/ethernet/dec/tulip/winbond-840.c=1337=static u32 __set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/dec/tulip/winbond-840.c-1356-\t\tmemset(mc_filter, 0, sizeof(mc_filter));\ndrivers/net/ethernet/dec/tulip/winbond-840.c:1357:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dec/tulip/winbond-840.c-1358-\t\t\tint filbit;\n--\ndrivers/net/ethernet/dlink/dl2k.c=1210=set_multicast (struct net_device *dev)\n--\ndrivers/net/ethernet/dlink/dl2k.c-1232-\t\t ReceiveBroadcast | ReceiveMulticastHash | ReceiveUnicast;\ndrivers/net/ethernet/dlink/dl2k.c:1233:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dlink/dl2k.c-1234-\t\t\tint bit, index = 0;\n--\ndrivers/net/ethernet/dlink/sundance.c=1557=static void set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/dlink/sundance.c-1578-\t\tmemset (mc_filter, 0, sizeof (mc_filter));\ndrivers/net/ethernet/dlink/sundance.c:1579:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/dlink/sundance.c-1580-\t\t\tcrc = ether_crc_le(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/emulex/benet/be_main.c=1684=static void be_set_mc_list(struct be_adapter *adapter)\n--\ndrivers/net/ethernet/emulex/benet/be_main.c-1713-\t\t/* cache the mc-list in adapter */\ndrivers/net/ethernet/emulex/benet/be_main.c:1714:\t\tnetdev_for_each_mc_addr(ha, netdev) {\ndrivers/net/ethernet/emulex/benet/be_main.c-1715-\t\t\tether_addr_copy(adapter-\u003emc_list[i].mac, ha-\u003eaddr);\n--\ndrivers/net/ethernet/ethoc.c=824=static void ethoc_set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/ethoc.c-855-\t} else {\ndrivers/net/ethernet/ethoc.c:856:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/ethoc.c-857-\t\t\tu32 crc = ether_crc(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/faraday/ftgmac100.c=394=static void ftgmac100_calc_mc_hash(struct ftgmac100 *priv)\n--\ndrivers/net/ethernet/faraday/ftgmac100.c-399-\tpriv-\u003emaht0 = 0;\ndrivers/net/ethernet/faraday/ftgmac100.c:400:\tnetdev_for_each_mc_addr(ha, priv-\u003enetdev) {\ndrivers/net/ethernet/faraday/ftgmac100.c-401-\t\tu32 crc_val = ether_crc_le(ETH_ALEN, ha-\u003eaddr);\n--\ndrivers/net/ethernet/faraday/ftmac100.c=151=static void ftmac100_setup_mc_ht(struct ftmac100 *priv)\n--\ndrivers/net/ethernet/faraday/ftmac100.c-155-\ndrivers/net/ethernet/faraday/ftmac100.c:156:\tnetdev_for_each_mc_addr(ha, priv-\u003enetdev) {\ndrivers/net/ethernet/faraday/ftmac100.c-157-\t\tu32 hash = ether_crc(ETH_ALEN, ha-\u003eaddr) \u003e\u003e 26;\n--\ndrivers/net/ethernet/fealnx.c=1772=static void __set_rx_mode(struct net_device *dev)\n--\ndrivers/net/ethernet/fealnx.c-1790-\t\tmemset(mc_filter, 0, sizeof(mc_filter));\ndrivers/net/ethernet/fealnx.c:1791:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/fealnx.c-1792-\t\t\tunsigned int bit;\n--\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c=2406=static void dpaa2_eth_add_mc_hw_addr(const struct net_device *net_dev,\n--\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c-2411-\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c:2412:\tnetdev_for_each_mc_addr(ha, net_dev) {\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c-2413-\t\terr = dpni_add_mac_addr(priv-\u003emc_io, 0, priv-\u003emc_token,\n--\ndrivers/net/ethernet/freescale/enetc/enetc_pf.c=115=static void enetc_pf_set_rx_mode(struct net_device *ndev)\n--\ndrivers/net/ethernet/freescale/enetc/enetc_pf.c-154-\ndrivers/net/ethernet/freescale/enetc/enetc_pf.c:155:\t\tnetdev_for_each_mc_addr(ha, ndev) {\ndrivers/net/ethernet/freescale/enetc/enetc_pf.c-156-\t\t\tif (!is_multicast_ether_addr(ha-\u003eaddr))\n--\ndrivers/net/ethernet/freescale/fec_main.c=4275=static void set_multicast_list(struct net_device *ndev)\n--\ndrivers/net/ethernet/freescale/fec_main.c-4304-\t/* Add the addresses in hash register */\ndrivers/net/ethernet/freescale/fec_main.c:4305:\tnetdev_for_each_mc_addr(ha, ndev) {\ndrivers/net/ethernet/freescale/fec_main.c-4306-\t\t/* calculate crc32 value of mac address */\n--\ndrivers/net/ethernet/freescale/fec_mpc52xx.c=550=static void mpc52xx_fec_set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/freescale/fec_mpc52xx.c-573-\ndrivers/net/ethernet/freescale/fec_mpc52xx.c:574:\t\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/freescale/fec_mpc52xx.c-575-\t\t\t\tcrc = ether_crc_le(6, ha-\u003eaddr) \u003e\u003e 26;\n--\ndrivers/net/ethernet/freescale/fs_enet/mac-fcc.c=225=static void set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/freescale/fs_enet/mac-fcc.c-230-\t\tset_multicast_start(dev);\ndrivers/net/ethernet/freescale/fs_enet/mac-fcc.c:231:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/freescale/fs_enet/mac-fcc.c-232-\t\t\tset_multicast_one(dev, ha-\u003eaddr);\n--\ndrivers/net/ethernet/freescale/fs_enet/mac-fec.c=210=static void set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/freescale/fs_enet/mac-fec.c-215-\t\tset_multicast_start(dev);\ndrivers/net/ethernet/freescale/fs_enet/mac-fec.c:216:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/freescale/fs_enet/mac-fec.c-217-\t\t\tset_multicast_one(dev, ha-\u003eaddr);\n--\ndrivers/net/ethernet/freescale/fs_enet/mac-scc.c=211=static void set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/freescale/fs_enet/mac-scc.c-216-\t\tset_multicast_start(dev);\ndrivers/net/ethernet/freescale/fs_enet/mac-scc.c:217:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/freescale/fs_enet/mac-scc.c-218-\t\t\tset_multicast_one(dev, ha-\u003eaddr);\n--\ndrivers/net/ethernet/freescale/gianfar.c=2916=static void gfar_set_multi(struct net_device *dev)\n--\ndrivers/net/ethernet/freescale/gianfar.c-2991-\t\t/* Parse the list, and set the appropriate bits */\ndrivers/net/ethernet/freescale/gianfar.c:2992:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/freescale/gianfar.c-2993-\t\t\tif (idx \u003c em_num) {\n--\ndrivers/net/ethernet/freescale/ucc_geth.c=1853=static void ucc_geth_set_multi(struct net_device *dev)\n--\ndrivers/net/ethernet/freescale/ucc_geth.c-1884-\ndrivers/net/ethernet/freescale/ucc_geth.c:1885:\t\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/freescale/ucc_geth.c-1886-\t\t\t\t/* Ask CPM to run CRC and set bit in\n--\ndrivers/net/ethernet/hisilicon/hisi_femac.c=613=static void hisi_femac_set_mc_addr_filter(struct hisi_femac_priv *priv)\n--\ndrivers/net/ethernet/hisilicon/hisi_femac.c-629-\ndrivers/net/ethernet/hisilicon/hisi_femac.c:630:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/hisilicon/hisi_femac.c-631-\t\t\thisi_femac_set_hw_addr_filter(priv, ha-\u003eaddr, reg);\n--\ndrivers/net/ethernet/hisilicon/hns/hns_enet.c=1855=static void hns_set_multicast_list(struct net_device *ndev)\n--\ndrivers/net/ethernet/hisilicon/hns/hns_enet.c-1870-\tif (h-\u003edev-\u003eops-\u003eset_mc_addr) {\ndrivers/net/ethernet/hisilicon/hns/hns_enet.c:1871:\t\tnetdev_for_each_mc_addr(ha, ndev)\ndrivers/net/ethernet/hisilicon/hns/hns_enet.c-1872-\t\t\tif (h-\u003edev-\u003eops-\u003eset_mc_addr(h, ha-\u003eaddr))\n--\ndrivers/net/ethernet/i825xx/82596.c=1441=static void set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/i825xx/82596.c-1493-\t\tcp = cmd-\u003emc_addrs;\ndrivers/net/ethernet/i825xx/82596.c:1494:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/i825xx/82596.c-1495-\t\t\tif (!cnt--)\n--\ndrivers/net/ethernet/i825xx/lib82596.c=1348=static void set_multicast_list(struct net_device *dev)\n--\ndrivers/net/ethernet/i825xx/lib82596.c-1408-\t\tcp = cmd-\u003emc_addrs;\ndrivers/net/ethernet/i825xx/lib82596.c:1409:\t\tnetdev_for_each_mc_addr(ha, dev) {\ndrivers/net/ethernet/i825xx/lib82596.c-1410-\t\t\tif (!cnt--)\n--\ndrivers/net/ethernet/i825xx/sun3_82586.c=401=static int init586(struct net_device *dev)\n--\ndrivers/net/ethernet/i825xx/sun3_82586.c-533-\t\ti = 0;\ndrivers/net/ethernet/i825xx/sun3_82586.c:534:\t\tnetdev_for_each_mc_addr(ha, dev)\ndrivers/net/ethernet/i825xx/sun3_82586.c-535-\t\t\tmemcpy((char *) mc_cmd-\u003emc_list[i++],\n--\ndrivers/net/ethernet/ibm/emac/core.c=411=static void emac_hash_mc(struct emac_instance *dev)\n--\ndrivers/net/ethernet/ibm/emac/core.c-422-\ndrivers/net/ethernet/ibm/emac/core.c:423:\tnetdev_for_each_mc_addr(ha, dev-\u003endev) {\n\n"
} |
| 83/3 | 2026/09/14 02:41 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 37039 output: 27 thoughts: 34 Thoughts: **Investigating Network Device Multicast Filtering in the Kernel** Okay, time to dig into how multicast addresses are handled within this network device code. I need to understand the modifications happening to `dev->mc` – specifically how the kernel manages the multicast address list associated with a network device. My approach is pretty straightforward: let's use some good old-fashioned grepping to find the relevant code. I'll search for instances of `dev_mc_add` which is likely a function call related to adding a multicast address, and also directly search for how the `dev->mc` field is being directly manipulated. This should get me a good handle on where the multicast filtering logic is and how it is implemented. |
| 84/3 | 2026/09/14 02:41 | tool | grepper |
0mArgs:{
"Expression": "dev_mc_add\\(|dev_mc_add_"
}Results: {
"Output": "Documentation/networking/dsa/dsa.rst=825=addresses:\n--\nDocumentation/networking/dsa/dsa.rst-832-- Secondary unicast and multicast MAC addresses of ports (addresses added\nDocumentation/networking/dsa/dsa.rst:833: through ``dev_uc_add()`` and ``dev_mc_add()``). These are also associated\nDocumentation/networking/dsa/dsa.rst-834- with the port private database of the respective user port.\n--\ndrivers/infiniband/sw/rxe/rxe_mcast.c=31=static int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)\n--\ndrivers/infiniband/sw/rxe/rxe_mcast.c-42-\ndrivers/infiniband/sw/rxe/rxe_mcast.c:43:\tret = dev_mc_add(ndev, ll_addr);\ndrivers/infiniband/sw/rxe/rxe_mcast.c-44-\tdev_put(ndev);\n--\ndrivers/net/bonding/bond_main.c=1888=int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,\n--\ndrivers/net/bonding/bond_main.c-2282-\t\t\tif (BOND_MODE(bond) == BOND_MODE_8023AD)\ndrivers/net/bonding/bond_main.c:2283:\t\t\t\tdev_mc_add(slave_dev, lacpdu_mcast_addr);\ndrivers/net/bonding/bond_main.c-2284-\t\t}\n--\ndrivers/net/bonding/bond_main.c=4345=static int bond_open(struct net_device *bond_dev)\n--\ndrivers/net/bonding/bond_main.c-4395-\t\tbond_for_each_slave(bond, slave, iter)\ndrivers/net/bonding/bond_main.c:4396:\t\t\tdev_mc_add(slave-\u003edev, lacpdu_mcast_addr);\ndrivers/net/bonding/bond_main.c-4397-\n--\ndrivers/net/bonding/bond_options.c=1311=static void slave_set_ns_maddrs(struct bonding *bond, struct slave *slave, bool add)\n--\ndrivers/net/bonding/bond_options.c-1327-\t\t\tif (add)\ndrivers/net/bonding/bond_options.c:1328:\t\t\t\tdev_mc_add(slave-\u003edev, slot_maddr);\ndrivers/net/bonding/bond_options.c-1329-\t\t\telse\n--\ndrivers/net/bonding/bond_options.c=1366=static void slave_set_ns_maddr(struct bonding *bond, struct slave *slave,\n--\ndrivers/net/bonding/bond_options.c-1384-\t !ndisc_mc_map(\u0026mcast_addr, mac_addr, slave-\u003edev, 0))\ndrivers/net/bonding/bond_options.c:1385:\t\tdev_mc_add(slave-\u003edev, mac_addr);\ndrivers/net/bonding/bond_options.c-1386-}\n--\ndrivers/net/ethernet/ibm/emac/core.c=1229=static int emac_open(struct net_device *ndev)\n--\ndrivers/net/ethernet/ibm/emac/core.c-1272-\t/* Required for Pause packet support in EMAC */\ndrivers/net/ethernet/ibm/emac/core.c:1273:\tdev_mc_add_global(ndev, default_mcast_addr);\ndrivers/net/ethernet/ibm/emac/core.c-1274-\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=13032=static int i40e_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-13060-\telse if (is_multicast_ether_addr(addr))\ndrivers/net/ethernet/intel/i40e/i40e_main.c:13061:\t\terr = dev_mc_add_excl(dev, addr);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-13062-\telse\n--\ndrivers/net/ethernet/intel/ice/ice_main.c=6106=ice_fdb_add(struct ndmsg *ndm, struct nlattr __always_unused *tb[],\n--\ndrivers/net/ethernet/intel/ice/ice_main.c-6124-\telse if (is_multicast_ether_addr(addr))\ndrivers/net/ethernet/intel/ice/ice_main.c:6125:\t\terr = dev_mc_add_excl(dev, addr);\ndrivers/net/ethernet/intel/ice/ice_main.c-6126-\telse\n--\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c=394=static int qlcnic_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],\n--\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c-419-\t} else if (is_multicast_ether_addr(addr)) {\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c:420:\t\terr = dev_mc_add_excl(netdev, addr);\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c-421-\t} else {\n--\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c=515=static int stmmac_test_hfilt(struct stmmac_priv *priv)\n--\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c-538-\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:539:\tret = dev_mc_add(priv-\u003edev, gd_addr);\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c-540-\tif (ret)\n--\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c=651=static int stmmac_test_ucfilt(struct stmmac_priv *priv)\n--\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c-674-\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:675:\tret = dev_mc_add(priv-\u003edev, mc_addr);\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c-676-\tif (ret)\n--\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c=718=static int stmmac_test_flowctrl(struct stmmac_priv *priv)\n--\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c-765-\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:766:\tret = dev_mc_add(priv-\u003edev, paddr);\ndrivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c-767-\tif (ret)\n--\ndrivers/net/macvlan.c=1045=static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],\n--\ndrivers/net/macvlan.c-1065-\telse if (is_multicast_ether_addr(addr))\ndrivers/net/macvlan.c:1066:\t\terr = dev_mc_add_excl(dev, addr);\ndrivers/net/macvlan.c-1067-\n--\ndrivers/net/phy/dp83640.c=534=static void enable_status_frames(struct phy_device *phydev, bool on)\n--\ndrivers/net/phy/dp83640.c-558-\tif (on) {\ndrivers/net/phy/dp83640.c:559:\t\tif (dev_mc_add(phydev-\u003eattached_dev, status_frame_dst))\ndrivers/net/phy/dp83640.c-560-\t\t\tphydev_warn(phydev, \"failed to add mc address\\n\");\n--\ndrivers/scsi/fcoe/fcoe.c=292=static int fcoe_interface_setup(struct fcoe_interface *fcoe,\n--\ndrivers/scsi/fcoe/fcoe.c-344-\tif (fip-\u003emode == FIP_MODE_VN2VN) {\ndrivers/scsi/fcoe/fcoe.c:345:\t\tdev_mc_add(netdev, FIP_ALL_VN2VN_MACS);\ndrivers/scsi/fcoe/fcoe.c:346:\t\tdev_mc_add(netdev, FIP_ALL_P2P_MACS);\ndrivers/scsi/fcoe/fcoe.c-347-\t} else\ndrivers/scsi/fcoe/fcoe.c:348:\t\tdev_mc_add(netdev, FIP_ALL_ENODE_MACS);\ndrivers/scsi/fcoe/fcoe.c-349-\n--\ndrivers/scsi/fcoe/fcoe.c=2006=static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev)\n--\ndrivers/scsi/fcoe/fcoe.c-2013-\t\tdev_mc_del(fcoe-\u003enetdev, FIP_ALL_ENODE_MACS);\ndrivers/scsi/fcoe/fcoe.c:2014:\t\tdev_mc_add(fcoe-\u003enetdev, FIP_ALL_VN2VN_MACS);\ndrivers/scsi/fcoe/fcoe.c:2015:\t\tdev_mc_add(fcoe-\u003enetdev, FIP_ALL_P2P_MACS);\ndrivers/scsi/fcoe/fcoe.c-2016-\t} else if (ctlr-\u003emode != FIP_MODE_FABRIC) {\n--\ndrivers/scsi/fcoe/fcoe.c-2018-\t\tdev_mc_del(fcoe-\u003enetdev, FIP_ALL_P2P_MACS);\ndrivers/scsi/fcoe/fcoe.c:2019:\t\tdev_mc_add(fcoe-\u003enetdev, FIP_ALL_ENODE_MACS);\ndrivers/scsi/fcoe/fcoe.c-2020-\t}\n--\ninclude/linux/netdevice.h=5152=static inline void __dev_uc_unsync(struct net_device *dev,\n--\ninclude/linux/netdevice.h-5159-/* Functions used for multicast addresses handling */\ninclude/linux/netdevice.h:5160:int dev_mc_add(struct net_device *dev, const unsigned char *addr);\ninclude/linux/netdevice.h:5161:int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);\ninclude/linux/netdevice.h:5162:int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);\ninclude/linux/netdevice.h-5163-int dev_mc_del(struct net_device *dev, const unsigned char *addr);\n--\nnet/802/garp.c=573=int garp_init_applicant(struct net_device *dev, struct garp_application *appl)\n--\nnet/802/garp.c-590-\nnet/802/garp.c:591:\terr = dev_mc_add(dev, appl-\u003eproto.group_address);\nnet/802/garp.c-592-\tif (err \u003c 0)\n--\nnet/802/mrp.c=864=int mrp_init_applicant(struct net_device *dev, struct mrp_application *appl)\n--\nnet/802/mrp.c-881-\nnet/802/mrp.c:882:\terr = dev_mc_add(dev, appl-\u003egroup_address);\nnet/802/mrp.c-883-\tif (err \u003c 0)\n--\nnet/core/dev_addr_lists.c=966=EXPORT_SYMBOL(dev_uc_init);\n--\nnet/core/dev_addr_lists.c-972-/**\nnet/core/dev_addr_lists.c:973: *\tdev_mc_add_excl - Add a global secondary multicast address\nnet/core/dev_addr_lists.c-974- *\t@dev: device\n--\nnet/core/dev_addr_lists.c-976- */\nnet/core/dev_addr_lists.c:977:int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)\nnet/core/dev_addr_lists.c-978-{\n--\nnet/core/dev_addr_lists.c-989-}\nnet/core/dev_addr_lists.c:990:EXPORT_SYMBOL(dev_mc_add_excl);\nnet/core/dev_addr_lists.c-991-\nnet/core/dev_addr_lists.c:992:static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,\nnet/core/dev_addr_lists.c-993-\t\t\tbool global)\n--\nnet/core/dev_addr_lists.c-1013- */\nnet/core/dev_addr_lists.c:1014:int dev_mc_add(struct net_device *dev, const unsigned char *addr)\nnet/core/dev_addr_lists.c-1015-{\nnet/core/dev_addr_lists.c:1016:\treturn __dev_mc_add(dev, addr, false);\nnet/core/dev_addr_lists.c-1017-}\nnet/core/dev_addr_lists.c=1018=EXPORT_SYMBOL(dev_mc_add);\n--\nnet/core/dev_addr_lists.c-1020-/**\nnet/core/dev_addr_lists.c:1021: *\tdev_mc_add_global - Add a global multicast address\nnet/core/dev_addr_lists.c-1022- *\t@dev: device\n--\nnet/core/dev_addr_lists.c-1026- */\nnet/core/dev_addr_lists.c:1027:int dev_mc_add_global(struct net_device *dev, const unsigned char *addr)\nnet/core/dev_addr_lists.c-1028-{\nnet/core/dev_addr_lists.c:1029:\treturn __dev_mc_add(dev, addr, true);\nnet/core/dev_addr_lists.c-1030-}\nnet/core/dev_addr_lists.c:1031:EXPORT_SYMBOL(dev_mc_add_global);\nnet/core/dev_addr_lists.c-1032-\n--\nnet/core/dev_ioctl.c=541=static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,\n--\nnet/core/dev_ioctl.c-594-\t\tnetdev_lock_ops(dev);\nnet/core/dev_ioctl.c:595:\t\terr = dev_mc_add_global(dev, ifr-\u003eifr_hwaddr.sa_data);\nnet/core/dev_ioctl.c-596-\t\tnetif_rx_mode_sync(dev);\n--\nnet/core/rtnetlink.c=4890=int ndo_dflt_fdb_add(struct ndmsg *ndm,\n--\nnet/core/rtnetlink.c-4918-\telse if (is_multicast_ether_addr(addr))\nnet/core/rtnetlink.c:4919:\t\terr = dev_mc_add_excl(dev, addr);\nnet/core/rtnetlink.c-4920-\n--\nnet/dsa/port.c=1225=int dsa_port_bridge_host_mdb_add(const struct dsa_port *dp,\n--\nnet/dsa/port.c-1237-\nnet/dsa/port.c:1238:\terr = dev_mc_add(conduit, mdb-\u003eaddr);\nnet/dsa/port.c-1239-\tif (err)\n--\nnet/dsa/user.c=237=static int dsa_user_sync_mc(struct net_device *dev,\n--\nnet/dsa/user.c-247-\nnet/dsa/user.c:248:\tdev_mc_add(conduit, addr);\nnet/dsa/user.c-249-\n--\nnet/ipv4/igmp.c=1199=static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)\n--\nnet/ipv4/igmp.c-1211-\tif (arp_mc_map(addr, buf, dev, 0) == 0)\nnet/ipv4/igmp.c:1212:\t\tdev_mc_add(dev, buf);\nnet/ipv4/igmp.c-1213-}\n--\nnet/ipv6/mcast.c=684=static void igmp6_group_added(struct ifmcaddr6 *mc)\n--\nnet/ipv6/mcast.c-697-\t\tif (ndisc_mc_map(\u0026mc-\u003emca_addr, buf, dev, 0) == 0)\nnet/ipv6/mcast.c:698:\t\t\tdev_mc_add(dev, buf);\nnet/ipv6/mcast.c-699-\t}\n--\nnet/packet/af_packet.c=3666=static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,\n--\nnet/packet/af_packet.c-3673-\t\tif (what \u003e 0)\nnet/packet/af_packet.c:3674:\t\t\treturn dev_mc_add(dev, i-\u003eaddr);\nnet/packet/af_packet.c-3675-\t\telse\n"
} |
| 85/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 42008 output: 20 thoughts: 462 Thoughts: **Investigating Potential Zero-Length Multicast Address Issues** Okay, so I'm digging into how multicast addresses are handled in the network device code, specifically looking at `dev_mc_add` and its underlying functions. I see that every call to `dev_mc_add` eventually lands in `__dev_mc_add`. This function, after taking some locking precautions, calls `__hw_addr_add_ex` to actually add the multicast address. Now, `__hw_addr_add_ex` creates a hardware address structure (`ha`), using the device's address length (`dev->addr_len`) and copies the multicast address into it. The interesting part comes when `rtnl_fill_mcaddr` is used. This function, in turn, uses `nla_put` to place the multicast address in the Netlink message. `nla_put` copies `dev->addr_len` bytes from the hardware address. That's when it hits me: what if `dev->addr_len` is *zero*? This is a genuine concern, and I know that the loopback interface, `lo`, for instance, has an `addr_len` of zero. So, if `dev->addr_len` is zero, we'd have `nla_put(skb, IFA_MULTICAST, 0, ha->addr)`. With a zero attribute length, the payload length becomes zero, and nothing gets copied. Is this actually an issue? Now, the obvious question is, can `dev->addr_len` even *be* zero? I need to check whether the `dev->mc` list can even have entries on a device with a zero `addr_len`. Can this happen? I also need to consider what happens if `dev->addr_len` changes *dynamically* on the device. Is there code that modifies `addr_len` after the device is created? Perhaps in `dev_set_mac_address` or similar functions? I need to examine where `addr_len` is modified to confirm. |
| 86/3 | 2026/09/14 02:42 | tool | grepper |
0mArgs:{
"Expression": "addr_len\\s*="
}Results: {
"Output": "\nFull output is too long, showing 500 out of 1419 lines.\nUse more precise expression if possible.\n\narch/s390/pci/pci_insn.c=225=static inline int __pcilg_mio(u64 *data, u64 ioaddr, u64 len, u8 *status)\narch/s390/pci/pci_insn.c-226-{\narch/s390/pci/pci_insn.c:227:\tunion register_pair ioaddr_len = {.even = ioaddr, .odd = len};\narch/s390/pci/pci_insn.c-228-\tint cc, exception;\n--\narch/s390/pci/pci_insn.c=318=static inline int __pcistg_mio(u64 data, u64 ioaddr, u64 len, u8 *status)\narch/s390/pci/pci_insn.c-319-{\narch/s390/pci/pci_insn.c:320:\tunion register_pair ioaddr_len = {.even = ioaddr, .odd = len};\narch/s390/pci/pci_insn.c-321-\tint cc, exception;\n--\narch/s390/pci/pci_mmio.c=54=static inline int __pcistg_mio_inuser(\n--\narch/s390/pci/pci_mmio.c-57-{\narch/s390/pci/pci_mmio.c:58:\tunion register_pair ioaddr_len = {.even = (u64 __force)ioaddr, .odd = ulen};\narch/s390/pci/pci_mmio.c-59-\tint cc, exception;\n--\narch/s390/pci/pci_mmio.c=209=static inline int __pcilg_mio_inuser(\n--\narch/s390/pci/pci_mmio.c-212-{\narch/s390/pci/pci_mmio.c:213:\tunion register_pair ioaddr_len = {.even = (u64 __force)ioaddr, .odd = ulen};\narch/s390/pci/pci_mmio.c-214-\tbool sacf_flag;\n--\ndrivers/block/drbd/drbd_main.c=2399=struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len,\n--\ndrivers/block/drbd/drbd_main.c-2407-\t\tfor_each_connection_rcu(connection, resource) {\ndrivers/block/drbd/drbd_main.c:2408:\t\t\tif (connection-\u003emy_addr_len == my_addr_len \u0026\u0026\ndrivers/block/drbd/drbd_main.c:2409:\t\t\t connection-\u003epeer_addr_len == peer_addr_len \u0026\u0026\ndrivers/block/drbd/drbd_main.c-2410-\t\t\t !memcmp(\u0026connection-\u003emy_addr, my_addr, my_addr_len) \u0026\u0026\n--\ndrivers/block/drbd/drbd_nl.c=360=static void setup_khelper_env(struct drbd_connection *connection, char **envp)\n--\ndrivers/block/drbd/drbd_nl.c-364-\t/* FIXME: A future version will not allow this case. */\ndrivers/block/drbd/drbd_nl.c:365:\tif (connection-\u003emy_addr_len == 0 || connection-\u003epeer_addr_len == 0)\ndrivers/block/drbd/drbd_nl.c-366-\t\treturn;\n--\ndrivers/block/drbd/drbd_nl.c=2587=int drbd_nl_connect_doit(struct sk_buff *skb, struct genl_info *info)\n--\ndrivers/block/drbd/drbd_nl.c-2686-\ndrivers/block/drbd/drbd_nl.c:2687:\tconnection-\u003emy_addr_len = nla_len(adm_ctx-\u003emy_addr);\ndrivers/block/drbd/drbd_nl.c-2688-\tmemcpy(\u0026connection-\u003emy_addr, nla_data(adm_ctx-\u003emy_addr), connection-\u003emy_addr_len);\ndrivers/block/drbd/drbd_nl.c:2689:\tconnection-\u003epeer_addr_len = nla_len(adm_ctx-\u003epeer_addr);\ndrivers/block/drbd/drbd_nl.c-2690-\tmemcpy(\u0026connection-\u003epeer_addr, nla_data(adm_ctx-\u003epeer_addr), connection-\u003epeer_addr_len);\n--\ndrivers/block/drbd/drbd_nl_gen.c=645=static int __drbd_cfg_context_from_attrs(struct drbd_cfg_context *s,\n--\ndrivers/block/drbd/drbd_nl_gen.c-675-\tif (nla \u0026\u0026 s)\ndrivers/block/drbd/drbd_nl_gen.c:676:\t\ts-\u003ectx_my_addr_len = nla_memcpy(s-\u003ectx_my_addr, nla, 128);\ndrivers/block/drbd/drbd_nl_gen.c-677-\n--\ndrivers/block/drbd/drbd_nl_gen.c-679-\tif (nla \u0026\u0026 s)\ndrivers/block/drbd/drbd_nl_gen.c:680:\t\ts-\u003ectx_peer_addr_len = nla_memcpy(s-\u003ectx_peer_addr, nla, 128);\ndrivers/block/drbd/drbd_nl_gen.c-681-\n--\ndrivers/block/drbd/drbd_receiver.c=400=static struct socket *drbd_try_connect(struct drbd_connection *connection)\n--\ndrivers/block/drbd/drbd_receiver.c-421-\ndrivers/block/drbd/drbd_receiver.c:422:\tmy_addr_len = min_t(int, connection-\u003emy_addr_len, sizeof(src_in6));\ndrivers/block/drbd/drbd_receiver.c-423-\tmemcpy(\u0026src_in6, \u0026connection-\u003emy_addr, my_addr_len);\n--\ndrivers/block/drbd/drbd_receiver.c-429-\ndrivers/block/drbd/drbd_receiver.c:430:\tpeer_addr_len = min_t(int, connection-\u003epeer_addr_len, sizeof(src_in6));\ndrivers/block/drbd/drbd_receiver.c-431-\tmemcpy(\u0026peer_in6, \u0026connection-\u003epeer_addr, peer_addr_len);\n--\ndrivers/block/drbd/drbd_receiver.c=507=static int prepare_listen_socket(struct drbd_connection *connection, struct accept_wait_data *ad)\n--\ndrivers/block/drbd/drbd_receiver.c-524-\ndrivers/block/drbd/drbd_receiver.c:525:\tmy_addr_len = min_t(int, connection-\u003emy_addr_len, sizeof(struct sockaddr_in6));\ndrivers/block/drbd/drbd_receiver.c-526-\tmemcpy(\u0026my_addr, \u0026connection-\u003emy_addr, my_addr_len);\n--\ndrivers/block/drbd/drbd_state.c=2047=static int w_after_conn_state_ch(struct drbd_work *w, int unused)\n--\ndrivers/block/drbd/drbd_state.c-2076-\t\told_conf = connection-\u003enet_conf;\ndrivers/block/drbd/drbd_state.c:2077:\t\tconnection-\u003emy_addr_len = 0;\ndrivers/block/drbd/drbd_state.c:2078:\t\tconnection-\u003epeer_addr_len = 0;\ndrivers/block/drbd/drbd_state.c-2079-\t\tRCU_INIT_POINTER(connection-\u003enet_conf, NULL);\n--\ndrivers/char/ipmi/ipmi_devintf.c=195=static int handle_recv(struct ipmi_file_private *priv,\n--\ndrivers/char/ipmi/ipmi_devintf.c-227-\ndrivers/char/ipmi/ipmi_devintf.c:228:\taddr_len = ipmi_addr_length(msg-\u003eaddr.addr_type);\ndrivers/char/ipmi/ipmi_devintf.c-229-\tif (rsp-\u003eaddr_len \u003c addr_len) {\n--\ndrivers/char/ipmi/ipmi_devintf.c-237-\t}\ndrivers/char/ipmi/ipmi_devintf.c:238:\trsp-\u003eaddr_len = addr_len;\ndrivers/char/ipmi/ipmi_devintf.c-239-\n--\ndrivers/char/ipmi/ipmi_devintf.c=670=static void get_compat_ipmi_req(struct ipmi_req *p64,\n--\ndrivers/char/ipmi/ipmi_devintf.c-673-\tp64-\u003eaddr = compat_ptr(p32-\u003eaddr);\ndrivers/char/ipmi/ipmi_devintf.c:674:\tp64-\u003eaddr_len = p32-\u003eaddr_len;\ndrivers/char/ipmi/ipmi_devintf.c-675-\tp64-\u003emsgid = p32-\u003emsgid;\n--\ndrivers/char/ipmi/ipmi_devintf.c=687=static void get_compat_ipmi_recv(struct ipmi_recv *p64,\n--\ndrivers/char/ipmi/ipmi_devintf.c-692-\tp64-\u003eaddr = compat_ptr(p32-\u003eaddr);\ndrivers/char/ipmi/ipmi_devintf.c:693:\tp64-\u003eaddr_len = p32-\u003eaddr_len;\ndrivers/char/ipmi/ipmi_devintf.c-694-\tp64-\u003emsgid = p32-\u003emsgid;\n--\ndrivers/char/ipmi/ipmi_devintf.c=698=static int copyout_recv32(struct ipmi_recv *p64, void __user *to)\n--\ndrivers/char/ipmi/ipmi_devintf.c-703-\tv32.addr = ptr_to_compat(p64-\u003eaddr);\ndrivers/char/ipmi/ipmi_devintf.c:704:\tv32.addr_len = p64-\u003eaddr_len;\ndrivers/char/ipmi/ipmi_devintf.c-705-\tv32.msgid = p64-\u003emsgid;\n--\ndrivers/firewire/net.c=1377=static void fwnet_init_dev(struct net_device *net)\n--\ndrivers/firewire/net.c-1383-\tnet-\u003efeatures\t\t= NETIF_F_HIGHDMA;\ndrivers/firewire/net.c:1384:\tnet-\u003eaddr_len\t\t= FWNET_ALEN;\ndrivers/firewire/net.c-1385-\tnet-\u003ehard_header_len\t= FWNET_HLEN;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c=50=int amdgpu_umc_page_retirement_mca(struct amdgpu_device *adev,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-69-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c:70:\terr_data.err_addr_len = adev-\u003eumc.max_ras_err_cnt_per_query;\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-71-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c=95=void amdgpu_umc_handle_bad_pages(struct amdgpu_device *adev,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-116-\telse\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c:117:\t\terr_data-\u003eerr_addr_len = adev-\u003eumc.max_ras_err_cnt_per_query;\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-118-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-141-\t\t\telse\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c:142:\t\t\t\terr_data-\u003eerr_addr_len =\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-143-\t\t\t\t\tadev-\u003eumc.max_ras_err_cnt_per_query;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-171-\t\t\telse\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c:172:\t\t\t\terr_data-\u003eerr_addr_len =\ndrivers/gpu/drm/amd/amdgpu/amdgpu_umc.c-173-\t\t\t\t\tadev-\u003eumc.max_ras_err_cnt_per_query;\n--\ndrivers/gpu/drm/xe/xe_sched_job.c=318=xe_sched_job_snapshot_capture(struct xe_sched_job *job)\n--\ndrivers/gpu/drm/xe/xe_sched_job.c-329-\ndrivers/gpu/drm/xe/xe_sched_job.c:330:\tsnapshot-\u003ebatch_addr_len = q-\u003ewidth;\ndrivers/gpu/drm/xe/xe_sched_job.c-331-\tfor (i = 0; i \u003c q-\u003ewidth; i++)\n--\ndrivers/hsi/clients/ssi_protocol.c=1055=static void ssip_pn_setup(struct net_device *dev)\n--\ndrivers/hsi/clients/ssi_protocol.c-1064-\tdev-\u003ehard_header_len\t= 1;\ndrivers/hsi/clients/ssi_protocol.c:1065:\tdev-\u003eaddr_len\t\t= 1;\ndrivers/hsi/clients/ssi_protocol.c-1066-\tdev_addr_set(dev, \u0026addr);\n--\ndrivers/i2c/busses/i2c-dln2.c=70=static int dln2_i2c_write(struct dln2_i2c *dln2, u8 addr,\n--\ndrivers/i2c/busses/i2c-dln2.c-87-\ttx-\u003eaddr = addr;\ndrivers/i2c/busses/i2c-dln2.c:88:\ttx-\u003emem_addr_len = 0;\ndrivers/i2c/busses/i2c-dln2.c-89-\ttx-\u003emem_addr = 0;\n--\ndrivers/i2c/busses/i2c-dln2.c=101=static int dln2_i2c_read(struct dln2_i2c *dln2, u16 addr, u8 *data,\n--\ndrivers/i2c/busses/i2c-dln2.c-121-\ttx.addr = addr;\ndrivers/i2c/busses/i2c-dln2.c:122:\ttx.mem_addr_len = 0;\ndrivers/i2c/busses/i2c-dln2.c-123-\ttx.mem_addr = 0;\n--\ndrivers/i2c/busses/i2c-rtl9300.c=374=static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, unsigned short flags,\n--\ndrivers/i2c/busses/i2c-rtl9300.c-396-\txfer.reg_addr = command;\ndrivers/i2c/busses/i2c-rtl9300.c:397:\txfer.reg_addr_len = drv_data-\u003ereg_addr_8bit_len;\ndrivers/i2c/busses/i2c-rtl9300.c-398-\n--\ndrivers/i2c/busses/i2c-rtl9300.c-403-\t\txfer.reg_addr = 0;\ndrivers/i2c/busses/i2c-rtl9300.c:404:\t\txfer.reg_addr_len = 0;\ndrivers/i2c/busses/i2c-rtl9300.c-405-\t\txfer.type = RTL9300_I2C_XFER_BYTE;\n--\ndrivers/infiniband/ulp/ipoib/ipoib_main.c=2215=void ipoib_setup_common(struct net_device *dev)\n--\ndrivers/infiniband/ulp/ipoib/ipoib_main.c-2226-\tdev-\u003ehard_header_len\t = IPOIB_HARD_LEN;\ndrivers/infiniband/ulp/ipoib/ipoib_main.c:2227:\tdev-\u003eaddr_len\t\t = INFINIBAND_ALEN;\ndrivers/infiniband/ulp/ipoib/ipoib_main.c-2228-\tdev-\u003etype\t\t = ARPHRD_INFINIBAND;\n--\ndrivers/media/dvb-core/dvb_net.c=1347=static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)\n--\ndrivers/media/dvb-core/dvb_net.c-1371-\ndrivers/media/dvb-core/dvb_net.c:1372:\tnet-\u003eaddr_len = 6;\ndrivers/media/dvb-core/dvb_net.c-1373-\teth_hw_addr_set(net, dvbnet-\u003edvbdev-\u003eadapter-\u003eproposed_mac);\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c=140=int cx231xx_send_usb_command(struct cx231xx_i2c *i2c_bus,\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-146-\ndrivers/media/usb/cx231xx/cx231xx-core.c:147:\tu8 saddr_len = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c-148-\tu8 _i2c_period = 0;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-159-\ndrivers/media/usb/cx231xx/cx231xx-core.c:160:\tsaddr_len = req_data-\u003esaddr_len;\ndrivers/media/usb/cx231xx/cx231xx-core.c-161-\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c=1555=int cx231xx_read_i2c_master(struct cx231xx *dev, u8 dev_addr, u16 saddr,\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1561-\ndrivers/media/usb/cx231xx/cx231xx-core.c:1562:\tif (saddr_len == 0)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1563-\t\tsaddr = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1564:\telse if (saddr_len == 1)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1565-\t\tsaddr \u0026= 0xff;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1569-\treq_data.direction = I2C_M_RD;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1570:\treq_data.saddr_len = saddr_len;\ndrivers/media/usb/cx231xx/cx231xx-core.c-1571-\treq_data.saddr_dat = saddr;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c=1601=int cx231xx_write_i2c_master(struct cx231xx *dev, u8 dev_addr, u16 saddr,\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1612-\ndrivers/media/usb/cx231xx/cx231xx-core.c:1613:\tif (saddr_len == 0)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1614-\t\tsaddr = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1615:\telse if (saddr_len == 1)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1616-\t\tsaddr \u0026= 0xff;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1620-\treq_data.direction = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1621:\treq_data.saddr_len = saddr_len;\ndrivers/media/usb/cx231xx/cx231xx-core.c-1622-\treq_data.saddr_dat = saddr;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c=1640=int cx231xx_read_i2c_data(struct cx231xx *dev, u8 dev_addr, u16 saddr,\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1646-\ndrivers/media/usb/cx231xx/cx231xx-core.c:1647:\tif (saddr_len == 0)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1648-\t\tsaddr = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1649:\telse if (saddr_len == 1)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1650-\t\tsaddr \u0026= 0xff;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1654-\treq_data.direction = I2C_M_RD;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1655:\treq_data.saddr_len = saddr_len;\ndrivers/media/usb/cx231xx/cx231xx-core.c-1656-\treq_data.saddr_dat = saddr;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c=1676=int cx231xx_write_i2c_data(struct cx231xx *dev, u8 dev_addr, u16 saddr,\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1687-\ndrivers/media/usb/cx231xx/cx231xx-core.c:1688:\tif (saddr_len == 0)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1689-\t\tsaddr = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1690:\telse if (saddr_len == 1)\ndrivers/media/usb/cx231xx/cx231xx-core.c-1691-\t\tsaddr \u0026= 0xff;\n--\ndrivers/media/usb/cx231xx/cx231xx-core.c-1695-\treq_data.direction = 0;\ndrivers/media/usb/cx231xx/cx231xx-core.c:1696:\treq_data.saddr_len = saddr_len;\ndrivers/media/usb/cx231xx/cx231xx-core.c-1697-\treq_data.saddr_dat = saddr;\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c=72=static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-80-\tu8 loop = 0;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:81:\tu8 saddr_len = 1;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-82-\tu8 *buf_ptr = NULL;\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-129-\t\t/* special case for Xc5000 tuner case */\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:130:\t\tsaddr_len = 1;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-131-\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-139-\t\t\treq_data.direction = msg-\u003eflags;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:140:\t\t\treq_data.saddr_len = saddr_len;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-141-\t\t\treq_data.saddr_dat = msg-\u003ebuf[0];\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-166-\t\treq_data.direction = msg-\u003eflags;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:167:\t\treq_data.saddr_len = 0;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-168-\t\treq_data.saddr_dat = 0;\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c=183=static int cx231xx_i2c_recv_bytes(struct i2c_adapter *i2c_adap,\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-239-\t\treq_data.direction = msg-\u003eflags;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:240:\t\treq_data.saddr_len = msg-\u003elen;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-241-\t\treq_data.saddr_dat = msg-\u003ebuf[0] \u003c\u003c 8 | msg-\u003ebuf[1];\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-252-\t\treq_data.direction = msg-\u003eflags;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:253:\t\treq_data.saddr_len = 0;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-254-\t\treq_data.saddr_dat = 0;\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c=269=static int cx231xx_i2c_recv_bytes_with_saddr(struct i2c_adapter *i2c_adap,\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-317-\treq_data.direction = msg2-\u003eflags;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:318:\treq_data.saddr_len = msg1-\u003elen;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-319-\treq_data.saddr_dat = saddr;\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c=333=static int cx231xx_i2c_check_for_device(struct i2c_adapter *i2c_adap,\n--\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-344-\treq_data.direction = I2C_M_RD;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c:345:\treq_data.saddr_len = 0;\ndrivers/media/usb/cx231xx/cx231xx-i2c.c-346-\treq_data.saddr_dat = 0;\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c=113=static int af9015_write_reg_i2c(struct dvb_usb_device *d, u8 addr, u16 reg,\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-120-\t addr == state-\u003eaf9013_i2c_addr[1])\ndrivers/media/usb/dvb-usb-v2/af9015.c:121:\t\treq.addr_len = 3;\ndrivers/media/usb/dvb-usb-v2/af9015.c-122-\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c=126=static int af9015_read_reg_i2c(struct dvb_usb_device *d, u8 addr, u16 reg,\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-133-\t addr == state-\u003eaf9013_i2c_addr[1])\ndrivers/media/usb/dvb-usb-v2/af9015.c:134:\t\treq.addr_len = 3;\ndrivers/media/usb/dvb-usb-v2/af9015.c-135-\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c=139=static int af9015_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-176-\t\tmbox = 0;\ndrivers/media/usb/dvb-usb-v2/af9015.c:177:\t\taddr_len = 0;\ndrivers/media/usb/dvb-usb-v2/af9015.c-178-\t} else if (msg[0].len == 1) {\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-180-\t\tmbox = 0;\ndrivers/media/usb/dvb-usb-v2/af9015.c:181:\t\taddr_len = 1;\ndrivers/media/usb/dvb-usb-v2/af9015.c-182-\t} else if (msg[0].len == 2) {\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-184-\t\tmbox = 0;\ndrivers/media/usb/dvb-usb-v2/af9015.c:185:\t\taddr_len = 2;\ndrivers/media/usb/dvb-usb-v2/af9015.c-186-\t} else {\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-188-\t\tmbox = msg[0].buf[2];\ndrivers/media/usb/dvb-usb-v2/af9015.c:189:\t\taddr_len = 3;\ndrivers/media/usb/dvb-usb-v2/af9015.c-190-\t}\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-204-\t\treq.mbox = mbox;\ndrivers/media/usb/dvb-usb-v2/af9015.c:205:\t\treq.addr_len = addr_len;\ndrivers/media/usb/dvb-usb-v2/af9015.c-206-\t\treq.data_len = msg[0].len - addr_len;\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-222-\t\treq.mbox = mbox;\ndrivers/media/usb/dvb-usb-v2/af9015.c:223:\t\treq.addr_len = addr_len;\ndrivers/media/usb/dvb-usb-v2/af9015.c-224-\t\treq.data_len = msg[1].len;\n--\ndrivers/media/usb/dvb-usb-v2/af9015.c-240-\t\treq.mbox = mbox;\ndrivers/media/usb/dvb-usb-v2/af9015.c:241:\t\treq.addr_len = addr_len;\ndrivers/media/usb/dvb-usb-v2/af9015.c-242-\t\treq.data_len = msg[0].len;\n--\ndrivers/message/fusion/mptlan.c=1301=mpt_register_lan_device (MPT_ADAPTER *mpt_dev, int pnum)\n--\ndrivers/message/fusion/mptlan.c-1352-\ndrivers/message/fusion/mptlan.c:1353:\tdev-\u003eaddr_len = FC_ALEN;\ndrivers/message/fusion/mptlan.c-1354-\tdev_addr_set(dev, HWaddr);\n--\ndrivers/net/amt.c=3144=static void amt_link_setup(struct net_device *dev)\n--\ndrivers/net/amt.c-3153-\tdev-\u003ehard_header_len\t= 0;\ndrivers/net/amt.c:3154:\tdev-\u003eaddr_len\t\t= 0;\ndrivers/net/amt.c-3155-\tdev-\u003epriv_flags\t\t|= IFF_NO_QUEUE;\n--\ndrivers/net/arcnet/arcnet.c=366=static void arcdev_setup(struct net_device *dev)\n--\ndrivers/net/arcnet/arcnet.c-373-\ndrivers/net/arcnet/arcnet.c:374:\tdev-\u003eaddr_len = ARCNET_ALEN;\ndrivers/net/arcnet/arcnet.c-375-\tdev-\u003etx_queue_len = 100;\n--\ndrivers/net/bareudp.c=574=static void bareudp_setup(struct net_device *dev)\n--\ndrivers/net/bareudp.c-585-\tdev-\u003ehard_header_len = 0;\ndrivers/net/bareudp.c:586:\tdev-\u003eaddr_len = 0;\ndrivers/net/bareudp.c-587-\tdev-\u003emtu = ETH_DATA_LEN;\n--\ndrivers/net/bonding/bond_main.c=974=static int bond_set_dev_addr(struct net_device *bond_dev,\n--\ndrivers/net/bonding/bond_main.c-978-\ndrivers/net/bonding/bond_main.c:979:\tslave_dbg(bond_dev, slave_dev, \"bond_dev=%p slave_dev=%p slave_dev-\u003eaddr_len=%d\\n\",\ndrivers/net/bonding/bond_main.c-980-\t\t bond_dev, slave_dev, slave_dev-\u003eaddr_len);\n--\ndrivers/net/bonding/bond_main.c=1560=static void bond_setup_by_slave(struct net_device *bond_dev,\n--\ndrivers/net/bonding/bond_main.c-1572-\tbond_dev-\u003eneeded_headroom = slave_dev-\u003eneeded_headroom;\ndrivers/net/bonding/bond_main.c:1573:\tbond_dev-\u003eaddr_len\t = slave_dev-\u003eaddr_len;\ndrivers/net/bonding/bond_main.c-1574-\n--\ndrivers/net/can/dev/dev.c=282=void can_setup(struct net_device *dev)\n--\ndrivers/net/can/dev/dev.c-288-\tdev-\u003ehard_header_len = 0;\ndrivers/net/can/dev/dev.c:289:\tdev-\u003eaddr_len = 0;\ndrivers/net/can/dev/dev.c-290-\tdev-\u003etx_queue_len = 10;\n--\ndrivers/net/can/vcan.c=170=static void vcan_setup(struct net_device *dev)\n--\ndrivers/net/can/vcan.c-174-\tdev-\u003ehard_header_len\t= 0;\ndrivers/net/can/vcan.c:175:\tdev-\u003eaddr_len\t\t= 0;\ndrivers/net/can/vcan.c-176-\tdev-\u003etx_queue_len\t= 0;\n--\ndrivers/net/can/vxcan.c=182=static void vxcan_setup(struct net_device *dev)\n--\ndrivers/net/can/vxcan.c-188-\tdev-\u003ehard_header_len\t= 0;\ndrivers/net/can/vxcan.c:189:\tdev-\u003eaddr_len\t\t= 0;\ndrivers/net/can/vxcan.c-190-\tdev-\u003etx_queue_len\t= 0;\n--\ndrivers/net/ethernet/broadcom/cnic.c=319=static int cnic_send_nlmsg(struct cnic_local *cp, u32 type,\n--\ndrivers/net/ethernet/broadcom/cnic.c-342-\t\t\t sizeof(struct in6_addr));\ndrivers/net/ethernet/broadcom/cnic.c:343:\t\t\tpath_req.ip_addr_len = 16;\ndrivers/net/ethernet/broadcom/cnic.c-344-\t\t} else {\n--\ndrivers/net/ethernet/broadcom/cnic.c-346-\t\t\t sizeof(struct in_addr));\ndrivers/net/ethernet/broadcom/cnic.c:347:\t\t\tpath_req.ip_addr_len = 4;\ndrivers/net/ethernet/broadcom/cnic.c-348-\t\t}\n--\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c=6220=static void cxgb4_mgmt_setup(struct net_device *dev)\n--\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c-6224-\tdev-\u003ehard_header_len = 0;\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:6225:\tdev-\u003eaddr_len = 0;\ndrivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c-6226-\tdev-\u003etx_queue_len = 0;\n--\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c=104=static unsigned int addr_hash(struct l2t_data *d, const u32 *addr,\n--\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-106-{\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c:107:\treturn addr_len == 4 ? arp_hash(d, addr, ifindex) :\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-108-\t\t\t ipv6_hash(d, addr, ifindex);\n--\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c=415=struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,\n--\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-421-\tstruct l2t_entry *e;\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c:422:\tunsigned int addr_len = neigh-\u003etbl-\u003ekey_len;\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-423-\tu32 *addr = (u32 *)neigh-\u003eprimary_key;\n--\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-459-\t\te-\u003elport = lport;\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c:460:\t\te-\u003ev6 = addr_len == 16;\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-461-\t\tatomic_set(\u0026e-\u003erefcnt, 1);\n--\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c=509=void t4_l2t_update(struct adapter *adap, struct neighbour *neigh)\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-510-{\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c:511:\tunsigned int addr_len = neigh-\u003etbl-\u003ekey_len;\ndrivers/net/ethernet/chelsio/cxgb4/l2t.c-512-\tu32 *addr = (u32 *) neigh-\u003eprimary_key;\n--\ndrivers/net/ethernet/intel/e100.c=762=static int e100_eeprom_load(struct nic *nic)\ndrivers/net/ethernet/intel/e100.c-763-{\ndrivers/net/ethernet/intel/e100.c:764:\tu16 addr, addr_len = 8, checksum = 0;\ndrivers/net/ethernet/intel/e100.c-765-\n--\ndrivers/net/ethernet/intel/e100.c=788=static int e100_eeprom_save(struct nic *nic, u16 start, u16 count)\ndrivers/net/ethernet/intel/e100.c-789-{\ndrivers/net/ethernet/intel/e100.c:790:\tu16 addr, addr_len = 8, checksum = 0;\ndrivers/net/ethernet/intel/e100.c-791-\n--\ndrivers/net/ethernet/intel/ice/devlink/port.c=390=static int ice_devlink_port_get_vf_fn_mac(struct devlink_port *port,\n--\ndrivers/net/ethernet/intel/ice/devlink/port.c-396-\tether_addr_copy(hw_addr, vf-\u003edev_lan_addr);\ndrivers/net/ethernet/intel/ice/devlink/port.c:397:\t*hw_addr_len = ETH_ALEN;\ndrivers/net/ethernet/intel/ice/devlink/port.c-398-\n--\ndrivers/net/ethernet/intel/ice/devlink/port.c=727=ice_devlink_port_fn_hw_addr_get(struct devlink_port *port, u8 *hw_addr,\n--\ndrivers/net/ethernet/intel/ice/devlink/port.c-735-\tether_addr_copy(hw_addr, dyn_port-\u003ehw_addr);\ndrivers/net/ethernet/intel/ice/devlink/port.c:736:\t*hw_addr_len = ETH_ALEN;\ndrivers/net/ethernet/intel/ice/devlink/port.c-737-\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/rep.c=187=static int rvu_rep_dl_port_fn_hw_addr_get(struct devlink_port *port,\n--\ndrivers/net/ethernet/marvell/octeontx2/nic/rep.c-193-\tether_addr_copy(hw_addr, rep-\u003emac);\ndrivers/net/ethernet/marvell/octeontx2/nic/rep.c:194:\t*hw_addr_len = ETH_ALEN;\ndrivers/net/ethernet/marvell/octeontx2/nic/rep.c-195-\treturn 0;\n--\ndrivers/net/ethernet/mellanox/mlx4/en_netdev.c=3161=int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,\n--\ndrivers/net/ethernet/mellanox/mlx4/en_netdev.c-3270-\t/* Set default MAC */\ndrivers/net/ethernet/mellanox/mlx4/en_netdev.c:3271:\tdev-\u003eaddr_len = ETH_ALEN;\ndrivers/net/ethernet/mellanox/mlx4/en_netdev.c-3272-\tmlx4_en_u64_to_mac(dev, mdev-\u003edev-\u003ecaps.def_mac[priv-\u003eport]);\n--\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c=5092=int mlx5_devlink_port_fn_hw_addr_get(struct devlink_port *port,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c-5103-\tether_addr_copy(hw_addr, vport-\u003einfo.mac);\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c:5104:\t*hw_addr_len = ETH_ALEN;\ndrivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c-5105-\tmutex_unlock(\u0026esw-\u003estate_lock);\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c=1342=mlxsw_sp_router_ip2me_fib_entry_find(struct mlxsw_sp *mlxsw_sp, u32 tb_id,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1363-\t\taddrp = \u0026addr4;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:1364:\t\taddr_len = 4;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1365-\t\taddr_prefix_len = 32;\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1368-\t\taddrp = \u0026addr-\u003eaddr6;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:1369:\t\taddr_len = 16;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1370-\t\taddr_prefix_len = 128;\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c=1387=mlxsw_sp_ipip_entry_find_decap(struct mlxsw_sp *mlxsw_sp,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1415-\t\tsaddrp = \u0026saddr4;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:1416:\t\tsaddr_len = 4;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1417-\t\tsaddr_prefix_len = 32;\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1420-\t\tsaddrp = \u0026saddr.addr6;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:1421:\t\tsaddr_len = 16;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_router.c-1422-\t\tsaddr_prefix_len = 128;\n--\ndrivers/net/ethernet/realtek/8139cp.c=1772=static int cp_get_eeprom(struct net_device *dev,\n--\ndrivers/net/ethernet/realtek/8139cp.c-1785-\ndrivers/net/ethernet/realtek/8139cp.c:1786:\taddr_len = read_eeprom(cp-\u003eregs, 0, 8) == 0x8129 ? 8 : 6;\ndrivers/net/ethernet/realtek/8139cp.c-1787-\n--\ndrivers/net/ethernet/realtek/8139cp.c=1810=static int cp_set_eeprom(struct net_device *dev,\n--\ndrivers/net/ethernet/realtek/8139cp.c-1824-\ndrivers/net/ethernet/realtek/8139cp.c:1825:\taddr_len = read_eeprom(cp-\u003eregs, 0, 8) == 0x8129 ? 8 : 6;\ndrivers/net/ethernet/realtek/8139cp.c-1826-\n--\ndrivers/net/ethernet/realtek/8139cp.c=1886=static int cp_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)\n--\ndrivers/net/ethernet/realtek/8139cp.c-1982-\t/* read MAC address from EEPROM */\ndrivers/net/ethernet/realtek/8139cp.c:1983:\taddr_len = read_eeprom (regs, 0, 8) == 0x8129 ? 8 : 6;\ndrivers/net/ethernet/realtek/8139cp.c-1984-\tfor (i = 0; i \u003c 3; i++)\n--\ndrivers/net/ethernet/realtek/8139too.c=938=static int rtl8139_init_one(struct pci_dev *pdev,\n--\ndrivers/net/ethernet/realtek/8139too.c-979-\ndrivers/net/ethernet/realtek/8139too.c:980:\taddr_len = read_eeprom (ioaddr, 0, 8) == 0x8129 ? 8 : 6;\ndrivers/net/ethernet/realtek/8139too.c-981-\tfor (i = 0; i \u003c 3; i++)\n--\ndrivers/net/ethernet/sfc/efx_devlink.c=30=static int efx_devlink_port_addr_get(struct devlink_port *port, u8 *hw_addr,\n--\ndrivers/net/ethernet/sfc/efx_devlink.c-74-out:\ndrivers/net/ethernet/sfc/efx_devlink.c:75:\t*hw_addr_len = ETH_ALEN;\ndrivers/net/ethernet/sfc/efx_devlink.c-76-\treturn rc;\n--\ndrivers/net/ethernet/sfc/falcon/falcon.c=2151=static void falcon_spi_device_init(struct ef4_nic *efx,\n--\ndrivers/net/ethernet/sfc/falcon/falcon.c-2158-\t\t\t1 \u003c\u003c SPI_DEV_TYPE_FIELD(device_type, SPI_DEV_TYPE_SIZE);\n\n"
} |
| 87/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 56458 output: 24 thoughts: 45 Thoughts: Okay, let's dive into this. Here's how I'd approach that analysis, as if it were my thought process: **Diving Deep into `dev->addr_len` Usage in RTNL Functions** Alright, I need to understand how `dev->addr_len` is being used across the RTNL layer. The primary concern right now is understanding its implications when we go and fill RTNL messages with address data and link information. So, where's the best place to start? I immediately think, *let's examine its use within other RTNL functions*. Specifically, I'm thinking about the low-level functions that build these messages. First up in my mental checklist: how is `dev->addr_len` handled in `rtnl_fill_ifaddr`? That function is crucial for setting up interface address information in the RTNL messages. We have to know if something that potentially comes down from the device drivers is correctly populated in an address message. Second, I need to check `rtnl_fill_link_ifinfomsg` -- that function deals with filling the link's interface information, and address information may be involved. We need to be able to tell what types of messages are being produced, and how this variable may affect that. I need to understand what those functions are expecting, and how `dev->addr_len` fits into the picture for each use case. Specifically, I'm thinking I'll be looking for how it influences the size or content of the attribute data being added to the RTNL messages. Is it being used to determine memory allocation? Are there any potential buffer overflows that I should be on the lookout for? I need to analyze how we're actually *using* this length field in practice and then I can deduce any potential vulnerabilities or logical errors. |
| 88/3 | 2026/09/14 02:42 | tool | grepper |
0mArgs:{
"Expression": "nla_put.*dev-\u003eaddr_len"
}Results: {
"Output": "net/bridge/br_netlink.c=458=static int br_fill_ifinfo(struct sk_buff *skb,\n--\nnet/bridge/br_netlink.c-495-\t (dev-\u003eaddr_len \u0026\u0026\nnet/bridge/br_netlink.c:496:\t nla_put(skb, IFLA_ADDRESS, dev-\u003eaddr_len, dev-\u003edev_addr)) ||\nnet/bridge/br_netlink.c-497-\t (dev-\u003eifindex != dev_get_iflink(dev) \u0026\u0026\n--\nnet/core/neighbour.c=2689=static int __neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh,\n--\nnet/core/neighbour.c-2720-\t\tneigh_ha_snapshot(haddr, neigh, neigh-\u003edev);\nnet/core/neighbour.c:2721:\t\tif (nla_put(skb, NDA_LLADDR, neigh-\u003edev-\u003eaddr_len, haddr) \u003c 0)\nnet/core/neighbour.c-2722-\t\t\tgoto nla_put_failure;\n--\nnet/core/rtnetlink.c=2110=static int rtnl_fill_ifinfo(struct sk_buff *skb,\n--\nnet/core/rtnetlink.c-2207-\tif (dev-\u003eaddr_len) {\nnet/core/rtnetlink.c:2208:\t\tif (nla_put(skb, IFLA_ADDRESS, dev-\u003eaddr_len, dev-\u003edev_addr) ||\nnet/core/rtnetlink.c:2209:\t\t nla_put(skb, IFLA_BROADCAST, dev-\u003eaddr_len, dev-\u003ebroadcast))\nnet/core/rtnetlink.c-2210-\t\t\tgoto nla_put_failure;\n--\nnet/core/rtnetlink.c-2247-\tif (memchr_inv(dev-\u003eperm_addr, '\\0', dev-\u003eaddr_len) \u0026\u0026\nnet/core/rtnetlink.c:2248:\t nla_put(skb, IFLA_PERM_ADDRESS, dev-\u003eaddr_len, dev-\u003eperm_addr))\nnet/core/rtnetlink.c-2249-\t\tgoto nla_put_failure;\n--\nnet/core/rtnetlink.c=4574=static int rtnl_fill_mcaddr(struct sk_buff *skb, const struct net_device *dev,\n--\nnet/core/rtnetlink.c-4596-\t nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)) ||\nnet/core/rtnetlink.c:4597:\t nla_put(skb, IFA_MULTICAST, dev-\u003eaddr_len, ha-\u003eaddr) ||\nnet/core/rtnetlink.c-4598-\t nla_put_u32(skb, IFA_MC_USERS, ha-\u003erefcount) ||\n--\nnet/core/rtnetlink.c=4819=static int nlmsg_populate_fdb_fill(struct sk_buff *skb,\n--\nnet/core/rtnetlink.c-4840-\nnet/core/rtnetlink.c:4841:\tif (nla_put(skb, NDA_LLADDR, dev-\u003eaddr_len, addr))\nnet/core/rtnetlink.c-4842-\t\tgoto nla_put_failure;\n--\nnet/core/rtnetlink.c=5567=int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,\n--\nnet/core/rtnetlink.c-5601-\t (dev-\u003eaddr_len \u0026\u0026\nnet/core/rtnetlink.c:5602:\t nla_put(skb, IFLA_ADDRESS, dev-\u003eaddr_len, dev-\u003edev_addr)) ||\nnet/core/rtnetlink.c-5603-\t (dev-\u003eifindex != dev_get_iflink(dev) \u0026\u0026\n--\nnet/ipv6/addrconf.c=6104=static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,\n--\nnet/ipv6/addrconf.c-6128-\t (dev-\u003eaddr_len \u0026\u0026\nnet/ipv6/addrconf.c:6129:\t nla_put(skb, IFLA_ADDRESS, dev-\u003eaddr_len, dev-\u003edev_addr)) ||\nnet/ipv6/addrconf.c-6130-\t nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev-\u003emtu)) ||\n--\nnet/mctp/neigh.c=209=static int mctp_fill_neigh(struct sk_buff *skb, u32 portid, u32 seq, int event,\n--\nnet/mctp/neigh.c-232-\nnet/mctp/neigh.c:233:\tif (nla_put(skb, NDA_LLADDR, dev-\u003eaddr_len, neigh-\u003eha))\nnet/mctp/neigh.c-234-\t\tgoto cancel;\n"
} |
| 89/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 58233 output: 17 thoughts: 1294 Thoughts: **Analyzing the Multicast Address Dump Request and Context Handling** Okay, let's break this down systematically. I'm focusing on the `rtnl_valid_dump_mcaddr_req` and `rtnl_dump_mcaddr` functions, especially the `rtnl_mcaddr_dump_filter` structure and the netlink callback context (`cb->ctx`). My initial thought is to confirm that the request validation is sane. Looking at `rtnl_valid_dump_mcaddr_req`, it seems straightforward. It takes the netlink header, socket, a filter struct, and an extended ack as input. It validates the header, specifically checking for invalid values in prefix length, flags, and scope which could indicate a malformed request. Then, it parses the Netlink attributes, specifically looking for `IFA_TARGET_NETNSID`, to specify a target network namespace. If `IFA_TARGET_NETNSID` is present, it retrieves the net namespace ID, validates that the caller has sufficient permissions using `rtnl_get_net_ns_capable`, and allocates a netns tracker. Crucially, I see that if `rtnl_get_net_ns_capable` fails, it returns an error *before* modifying the `filter->tgt_net` or allocating the tracker. The `filter->ifindex` field is set from the interface index in the request's payload, and if no errors occur, the function returns 0. Now, let's trace where this filter is used. In `rtnl_dump_mcaddr`, I see that a local `rtnl_mcaddr_dump_filter` is allocated on the stack and initialized with `.tgt_net = sock_net(skb->sk)` and `.netnsid = -1`. The other fields, `ns_tracker` and `ifindex`, are implicitly zero-initialized by the C designated initializer. This filter is then passed to `rtnl_valid_dump_mcaddr_req`. If `rtnl_valid_dump_mcaddr_req` fails, the `rtnl_dump_mcaddr` returns the error immediately, without calling `put_net_track`. If the validation passes and `IFA_TARGET_NETNSID` is supplied, `filter->tgt_net` can be updated, and the tracker allocated. The crucial part is at the `out:` label, where `put_net_track` is conditionally called based on `filter.netnsid`. This looks correct - it prevents a double-free or potential resource leak. A critical point to remember is the lifecycle of this filter. The entire `rtnl_dump_mcaddr` function is the owner of the filter struct. Finally, I need to check the context (`cb->ctx`) that is passed to the netlink callback. It seems the netlink callback receives a pointer to the callback context, which is not initialized in the function, but it appears to be a structure containing `ifindex` and `addr_idx`. The next logical step is to understand how `cb->ctx` is initialized during a netlink dump. I will investigate how the netlink dump functions (`netlink_dump` / `netlink_dumpit`) are responsible for setting this up. |
| 90/3 | 2026/09/14 02:42 | tool | grepper |
0mArgs:{
"Expression": "cb-\u003ectx"
}Results: {
"Output": "drivers/accel/habanalabs/common/command_buffer.c=168=static void hl_cb_mmap_mem_release(struct hl_mmap_mem_buf *buf)\n--\ndrivers/accel/habanalabs/common/command_buffer.c-174-\tif (cb-\u003eis_mmu_mapped)\ndrivers/accel/habanalabs/common/command_buffer.c:175:\t\tcb_unmap_mem(cb-\u003ectx, cb);\ndrivers/accel/habanalabs/common/command_buffer.c-176-\ndrivers/accel/habanalabs/common/command_buffer.c:177:\thl_ctx_put(cb-\u003ectx);\ndrivers/accel/habanalabs/common/command_buffer.c-178-\n--\ndrivers/accel/habanalabs/common/command_buffer.c=182=static int hl_cb_mmap_mem_alloc(struct hl_mmap_mem_buf *buf, gfp_t gfp, void *args)\n--\ndrivers/accel/habanalabs/common/command_buffer.c-217-\tcb-\u003ehdev = cb_args-\u003ehdev;\ndrivers/accel/habanalabs/common/command_buffer.c:218:\tcb-\u003ectx = cb_args-\u003ectx;\ndrivers/accel/habanalabs/common/command_buffer.c-219-\tcb-\u003ebuf = buf;\n--\ndrivers/accel/habanalabs/common/command_buffer.c-222-\ndrivers/accel/habanalabs/common/command_buffer.c:223:\thl_ctx_get(cb-\u003ectx);\ndrivers/accel/habanalabs/common/command_buffer.c-224-\n--\ndrivers/accel/habanalabs/common/command_buffer.c-242-release_cb:\ndrivers/accel/habanalabs/common/command_buffer.c:243:\thl_ctx_put(cb-\u003ectx);\ndrivers/accel/habanalabs/common/command_buffer.c-244-\tcb_do_release(cb_args-\u003ehdev, cb);\n--\ndrivers/accel/habanalabs/common/debugfs.c=105=static int command_buffers_show(struct seq_file *s, void *data)\n--\ndrivers/accel/habanalabs/common/debugfs.c-122-\t\t\t\" %03llu %d 0x%08x %d %d %d\\n\",\ndrivers/accel/habanalabs/common/debugfs.c:123:\t\t\tcb-\u003ebuf-\u003ehandle, cb-\u003ectx-\u003easid, cb-\u003esize,\ndrivers/accel/habanalabs/common/debugfs.c-124-\t\t\tkref_read(\u0026cb-\u003ebuf-\u003erefcount),\n--\ndrivers/dpll/dpll_netlink.c=28=static struct dpll_dump_ctx *dpll_dump_context(struct netlink_callback *cb)\ndrivers/dpll/dpll_netlink.c-29-{\ndrivers/dpll/dpll_netlink.c:30:\treturn (struct dpll_dump_ctx *)cb-\u003ectx;\ndrivers/dpll/dpll_netlink.c-31-}\n--\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser.c=797=static enum bp_result bios_parser_dac_load_detection(\n--\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser.c-802-\tstruct bios_parser *bp = BP_FROM_DCB(dcb);\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser.c:803:\tstruct dc_context *ctx = dcb-\u003ectx;\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser.c-804-\tstruct bp_load_detection_parameters bp_params = {0};\n--\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser2.c=1459=static enum bp_result bios_parser_get_lttpr_caps(\n--\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser2.c-1505-\tDC_LOG_BIOS(\"DCE_INFO_CAPS_LTTPR_SUPPORT_ENABLE: %d tbl_revision.major = %d tbl_revision.minor = %d\\n\", *dce_caps, tbl_revision.major, tbl_revi...\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser2.c:1506:\tif (dcb-\u003ectx-\u003edc-\u003econfig.force_bios_enable_lttpr \u0026\u0026 *dce_caps == 0) {\ndrivers/gpu/drm/amd/display/dc/bios/bios_parser2.c-1507-\t\t*dce_caps = 1;\n--\ndrivers/gpu/drm/drm_ras.c=82=struct drm_ras_ctx {\n--\ndrivers/gpu/drm/drm_ras.c-93- * their attributes (ID, name, type) to the given netlink message buffer.\ndrivers/gpu/drm/drm_ras.c:94: * Uses @cb-\u003ectx to track progress in case the message buffer fills up, allowing\ndrivers/gpu/drm/drm_ras.c-95- * multi-part dump support. On buffer overflow, updates the context to resume\n--\ndrivers/gpu/drm/drm_ras.c=102=int drm_ras_nl_list_nodes_dumpit(struct sk_buff *skb,\n--\ndrivers/gpu/drm/drm_ras.c-105-\tconst struct genl_info *info = genl_info_dump(cb);\ndrivers/gpu/drm/drm_ras.c:106:\tstruct drm_ras_ctx *ctx = (void *)cb-\u003ectx;\ndrivers/gpu/drm/drm_ras.c-107-\tstruct drm_ras_node *node;\n--\ndrivers/gpu/drm/drm_ras.c=189=static int doit_reply_value(struct genl_info *info, u32 node_id,\n--\ndrivers/gpu/drm/drm_ras.c-231- * their attributes (ID, name, value) to the given netlink message buffer.\ndrivers/gpu/drm/drm_ras.c:232: * Uses @cb-\u003ectx to track progress in case the message buffer fills up, allowing\ndrivers/gpu/drm/drm_ras.c-233- * multi-part dump support. On buffer overflow, updates the context to resume\n--\ndrivers/gpu/drm/drm_ras.c=240=int drm_ras_nl_get_error_counter_dumpit(struct sk_buff *skb,\n--\ndrivers/gpu/drm/drm_ras.c-243-\tconst struct genl_info *info = genl_info_dump(cb);\ndrivers/gpu/drm/drm_ras.c:244:\tstruct drm_ras_ctx *ctx = (void *)cb-\u003ectx;\ndrivers/gpu/drm/drm_ras.c-245-\tstruct drm_ras_node *node;\n--\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c=954=static int dpaa2_switch_fdb_dump_nl(struct fdb_dump_entry *entry,\n--\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c-956-{\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c:957:\tstruct ndo_fdb_dump_context *ctx = (void *)dump-\u003ecb-\u003ectx;\ndrivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c-958-\tint is_dynamic = entry-\u003etype \u0026 DPSW_FDB_ENTRY_DINAMIC;\n--\ndrivers/net/ethernet/mscc/ocelot_net.c=794=static int ocelot_port_fdb_do_dump(const unsigned char *addr, u16 vid,\n--\ndrivers/net/ethernet/mscc/ocelot_net.c-797-\tstruct ocelot_dump_ctx *dump = data;\ndrivers/net/ethernet/mscc/ocelot_net.c:798:\tstruct ndo_fdb_dump_context *ctx = (void *)dump-\u003ecb-\u003ectx;\ndrivers/net/ethernet/mscc/ocelot_net.c-799-\tu32 portid = NETLINK_CB(dump-\u003ecb-\u003eskb).portid;\n--\ndrivers/net/vxlan/vxlan_core.c=1350=static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,\n--\ndrivers/net/vxlan/vxlan_core.c-1353-{\ndrivers/net/vxlan/vxlan_core.c:1354:\tstruct ndo_fdb_dump_context *ctx = (void *)cb-\u003ectx;\ndrivers/net/vxlan/vxlan_core.c-1355-\tstruct vxlan_dev *vxlan = netdev_priv(dev);\n--\ndrivers/net/vxlan/vxlan_mdb.c=277=int vxlan_mdb_dump(struct net_device *dev, struct sk_buff *skb,\n--\ndrivers/net/vxlan/vxlan_mdb.c-279-{\ndrivers/net/vxlan/vxlan_mdb.c:280:\tstruct vxlan_mdb_dump_ctx *ctx = (void *)cb-\u003ectx;\ndrivers/net/vxlan/vxlan_mdb.c-281-\tstruct vxlan_dev *vxlan = netdev_priv(dev);\n--\nfs/ntfs3/fslog.c=2498=static int read_log_rec_lcb(struct ntfs_log *log, u64 lsn, u32 ctx_mode,\n--\nfs/ntfs3/fslog.c-2523-\tlcb-\u003eclient = log-\u003eclient_id;\nfs/ntfs3/fslog.c:2524:\tlcb-\u003ectx_mode = ctx_mode;\nfs/ntfs3/fslog.c-2525-\n--\nfs/ntfs3/fslog.c=2545=static int find_client_next_lsn(struct ntfs_log *log, struct lcb *lcb, u64 *lsn)\n--\nfs/ntfs3/fslog.c-2553-\nfs/ntfs3/fslog.c:2554:\tif (lcb_ctx_next != lcb-\u003ectx_mode)\nfs/ntfs3/fslog.c-2555-\t\tgoto check_undo_next;\n--\nfs/ntfs3/fslog.c-2593-check_undo_next:\nfs/ntfs3/fslog.c:2594:\tif (lcb_ctx_undo_next == lcb-\u003ectx_mode)\nfs/ntfs3/fslog.c-2595-\t\tnext_lsn = le64_to_cpu(hdr-\u003eclient_undo_next_lsn);\nfs/ntfs3/fslog.c:2596:\telse if (lcb_ctx_prev == lcb-\u003ectx_mode)\nfs/ntfs3/fslog.c-2597-\t\tnext_lsn = le64_to_cpu(hdr-\u003eclient_prev_lsn);\n--\nnet/bridge/br_fdb.c=1042=int br_fdb_dump(struct sk_buff *skb,\n--\nnet/bridge/br_fdb.c-1047-{\nnet/bridge/br_fdb.c:1048:\tstruct ndo_fdb_dump_context *ctx = (void *)cb-\u003ectx;\nnet/bridge/br_fdb.c-1049-\tstruct net_bridge *br = netdev_priv(dev);\n--\nnet/core/netdev-genl.c=27=static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb)\n--\nnet/core/netdev-genl.c-30-\nnet/core/netdev-genl.c:31:\treturn (struct netdev_nl_dump_ctx *)cb-\u003ectx;\nnet/core/netdev-genl.c-32-}\n--\nnet/core/page_pool_user.c=81=netdev_nl_page_pool_get_dump(struct sk_buff *skb, struct netlink_callback *cb,\n--\nnet/core/page_pool_user.c-83-{\nnet/core/page_pool_user.c:84:\tstruct page_pool_dump_cb *state = (void *)cb-\u003ectx;\nnet/core/page_pool_user.c-85-\tconst struct genl_info *info = genl_info_dump(cb);\n--\nnet/core/rtnetlink.c=2549=static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/core/rtnetlink.c-2558-\t\tunsigned long ifindex;\nnet/core/rtnetlink.c:2559:\t} *ctx = (void *)cb-\u003ectx;\nnet/core/rtnetlink.c-2560-\tstruct net *tgt_net = net;\n--\nnet/core/rtnetlink.c=4692=static int rtnl_dump_mcaddr(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/core/rtnetlink.c-4701-\t\tint addr_idx;\nnet/core/rtnetlink.c:4702:\t} *ctx = (void *)cb-\u003ectx;\nnet/core/rtnetlink.c-4703-\tunsigned long s_ifindex;\n--\nnet/core/rtnetlink.c=5169=static int nlmsg_populate_fdb(struct sk_buff *skb,\n--\nnet/core/rtnetlink.c-5174-{\nnet/core/rtnetlink.c:5175:\tstruct ndo_fdb_dump_context *ctx = (void *)cb-\u003ectx;\nnet/core/rtnetlink.c-5176-\tstruct netdev_hw_addr *ha;\n--\nnet/core/rtnetlink.c=5321=static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/core/rtnetlink.c-5323-\tconst struct net_device_ops *ops = NULL, *cops = NULL;\nnet/core/rtnetlink.c:5324:\tstruct ndo_fdb_dump_context *ctx = (void *)cb-\u003ectx;\nnet/core/rtnetlink.c-5325-\tstruct net_device *dev, *br_dev = NULL;\n--\nnet/core/rtnetlink.c=6654=static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/core/rtnetlink.c-6664-\t\tint prividx;\nnet/core/rtnetlink.c:6665:\t} *ctx = (void *)cb-\u003ectx;\nnet/core/rtnetlink.c-6666-\tstruct net_device *dev;\n--\nnet/core/rtnetlink.c=6836=static int rtnl_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)\nnet/core/rtnetlink.c-6837-{\nnet/core/rtnetlink.c:6838:\tstruct rtnl_mdb_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/core/rtnetlink.c-6839-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/core/rtnetlink.c-6866-\t\t */\nnet/core/rtnetlink.c:6867:\t\tmemset(cb-\u003ectx, 0, sizeof(cb-\u003ectx));\nnet/core/rtnetlink.c-6868-\t\tcb-\u003eprev_seq = 0;\n--\nnet/devlink/devl_internal.h=208=devlink_dump_state(struct netlink_callback *cb)\n--\nnet/devlink/devl_internal.h-211-\nnet/devlink/devl_internal.h:212:\treturn (struct devlink_nl_dump_state *)cb-\u003ectx;\nnet/devlink/devl_internal.h-213-}\n--\nnet/dsa/user.c=515=dsa_user_port_fdb_do_dump(const unsigned char *addr, u16 vid,\n--\nnet/dsa/user.c-518-\tstruct dsa_user_dump_ctx *dump = data;\nnet/dsa/user.c:519:\tstruct ndo_fdb_dump_context *ctx = (void *)dump-\u003ecb-\u003ectx;\nnet/dsa/user.c-520-\tu32 portid = NETLINK_CB(dump-\u003ecb-\u003eskb).portid;\n--\nnet/ethtool/netlink.c=436=static struct ethnl_dump_ctx *ethnl_dump_context(struct netlink_callback *cb)\nnet/ethtool/netlink.c-437-{\nnet/ethtool/netlink.c:438:\treturn (struct ethnl_dump_ctx *)cb-\u003ectx;\nnet/ethtool/netlink.c-439-}\n--\nnet/ethtool/netlink.c=442=ethnl_perphy_dump_context(struct netlink_callback *cb)\nnet/ethtool/netlink.c-443-{\nnet/ethtool/netlink.c:444:\treturn (struct ethnl_perphy_dump_ctx *)cb-\u003ectx;\nnet/ethtool/netlink.c-445-}\n--\nnet/ethtool/netlink.c=670=static int ethnl_default_start(struct netlink_callback *cb)\n--\nnet/ethtool/netlink.c-679-\nnet/ethtool/netlink.c:680:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/ethtool/netlink.c-681-\n--\nnet/ethtool/netlink.c=723=static int ethnl_perphy_start(struct netlink_callback *cb)\n--\nnet/ethtool/netlink.c-733-\nnet/ethtool/netlink.c:734:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/ethtool/netlink.c-735-\n--\nnet/ethtool/rss.c=362=static struct rss_nl_dump_ctx *rss_dump_ctx(struct netlink_callback *cb)\n--\nnet/ethtool/rss.c-365-\nnet/ethtool/rss.c:366:\treturn (struct rss_nl_dump_ctx *)cb-\u003ectx;\nnet/ethtool/rss.c-367-}\n--\nnet/ethtool/tsinfo.c=302=static void *ethnl_tsinfo_prepare_dump(struct sk_buff *skb,\n--\nnet/ethtool/tsinfo.c-306-{\nnet/ethtool/tsinfo.c:307:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-308-\tvoid *ehdr = NULL;\n--\nnet/ethtool/tsinfo.c=349=static int ethnl_tsinfo_dump_one_phydev(struct sk_buff *skb,\n--\nnet/ethtool/tsinfo.c-353-{\nnet/ethtool/tsinfo.c:354:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-355-\tstruct tsinfo_reply_data *reply_data;\n--\nnet/ethtool/tsinfo.c=388=static int ethnl_tsinfo_dump_one_netdev(struct sk_buff *skb,\n--\nnet/ethtool/tsinfo.c-391-{\nnet/ethtool/tsinfo.c:392:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-393-\tconst struct ethtool_ops *ops = dev-\u003eethtool_ops;\n--\nnet/ethtool/tsinfo.c=434=static int ethnl_tsinfo_dump_one_net_topo(struct sk_buff *skb,\n--\nnet/ethtool/tsinfo.c-437-{\nnet/ethtool/tsinfo.c:438:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-439-\tstruct phy_device_node *pdn;\n--\nnet/ethtool/tsinfo.c=473=int ethnl_tsinfo_dumpit(struct sk_buff *skb, struct netlink_callback *cb)\nnet/ethtool/tsinfo.c-474-{\nnet/ethtool/tsinfo.c:475:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-476-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/ethtool/tsinfo.c=500=int ethnl_tsinfo_start(struct netlink_callback *cb)\n--\nnet/ethtool/tsinfo.c-502-\tconst struct genl_dumpit_info *info = genl_dumpit_info(cb);\nnet/ethtool/tsinfo.c:503:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-504-\tstruct nlattr **tb = info-\u003einfo.attrs;\n--\nnet/ethtool/tsinfo.c-508-\nnet/ethtool/tsinfo.c:509:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/ethtool/tsinfo.c-510-\n--\nnet/ethtool/tsinfo.c=552=int ethnl_tsinfo_done(struct netlink_callback *cb)\nnet/ethtool/tsinfo.c-553-{\nnet/ethtool/tsinfo.c:554:\tstruct ethnl_tsinfo_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tsinfo.c-555-\tstruct tsinfo_req_info *req_info = ctx-\u003ereq_info;\n--\nnet/ethtool/tunnels.c=218=int ethnl_tunnel_info_start(struct netlink_callback *cb)\n--\nnet/ethtool/tunnels.c-220-\tconst struct genl_dumpit_info *info = genl_dumpit_info(cb);\nnet/ethtool/tunnels.c:221:\tstruct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tunnels.c-222-\tstruct nlattr **tb = info-\u003einfo.attrs;\n--\nnet/ethtool/tunnels.c-224-\nnet/ethtool/tunnels.c:225:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/ethtool/tunnels.c-226-\n--\nnet/ethtool/tunnels.c=241=int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)\nnet/ethtool/tunnels.c-242-{\nnet/ethtool/tunnels.c:243:\tstruct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/ethtool/tunnels.c-244-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/ipv4/devinet.c=1930=static int inet_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,\n--\nnet/ipv4/devinet.c-1945-\t\tint ip_idx;\nnet/ipv4/devinet.c:1946:\t} *ctx = (void *)cb-\u003ectx;\nnet/ipv4/devinet.c-1947-\tstruct in_device *in_dev;\n--\nnet/ipv4/devinet.c=2438=static int inet_netconf_dump_devconf(struct sk_buff *skb,\n--\nnet/ipv4/devinet.c-2445-\t\tunsigned int all_default;\nnet/ipv4/devinet.c:2446:\t} *ctx = (void *)cb-\u003ectx;\nnet/ipv4/devinet.c-2447-\tconst struct in_device *in_dev;\n--\nnet/ipv4/nexthop.c=3578=rtm_dump_nh_ctx(struct netlink_callback *cb)\nnet/ipv4/nexthop.c-3579-{\nnet/ipv4/nexthop.c:3580:\tstruct rtm_dump_nh_ctx *ctx = (void *)cb-\u003ectx;\nnet/ipv4/nexthop.c-3581-\nnet/ipv4/nexthop.c:3582:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/ipv4/nexthop.c-3583-\treturn ctx;\n--\nnet/ipv4/nexthop.c=3769=rtm_dump_res_bucket_ctx(struct netlink_callback *cb)\nnet/ipv4/nexthop.c-3770-{\nnet/ipv4/nexthop.c:3771:\tstruct rtm_dump_res_bucket_ctx *ctx = (void *)cb-\u003ectx;\nnet/ipv4/nexthop.c-3772-\nnet/ipv4/nexthop.c:3773:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/ipv4/nexthop.c-3774-\treturn ctx;\n--\nnet/ipv6/addrconf.c=738=static int inet6_netconf_dump_devconf(struct sk_buff *skb,\n--\nnet/ipv6/addrconf.c-745-\t\tunsigned int all_default;\nnet/ipv6/addrconf.c:746:\t} *ctx = (void *)cb-\u003ectx;\nnet/ipv6/addrconf.c-747-\tstruct net_device *dev;\n--\nnet/ipv6/addrconf.c=5436=static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,\n--\nnet/ipv6/addrconf.c-5451-\t\tint ip_idx;\nnet/ipv6/addrconf.c:5452:\t} *ctx = (void *)cb-\u003ectx;\nnet/ipv6/addrconf.c-5453-\tstruct net_device *dev;\n--\nnet/ipv6/addrconf.c=6177=static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/ipv6/addrconf.c-6181-\t\tunsigned long ifindex;\nnet/ipv6/addrconf.c:6182:\t} *ctx = (void *)cb-\u003ectx;\nnet/ipv6/addrconf.c-6183-\tstruct net_device *dev;\n--\nnet/l2tp/l2tp_netlink.c=502=static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)\nnet/l2tp/l2tp_netlink.c-503-{\nnet/l2tp/l2tp_netlink.c:504:\tstruct l2tp_nl_cb_data *cbd = (void *)\u0026cb-\u003ectx[0];\nnet/l2tp/l2tp_netlink.c-505-\tunsigned long key = cbd-\u003etkey;\n--\nnet/l2tp/l2tp_netlink.c=842=static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)\nnet/l2tp/l2tp_netlink.c-843-{\nnet/l2tp/l2tp_netlink.c:844:\tstruct l2tp_nl_cb_data *cbd = (void *)\u0026cb-\u003ectx[0];\nnet/l2tp/l2tp_netlink.c-845-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/mctp/device.c=95=static int mctp_dump_dev_addrinfo(struct mctp_dev *mdev, struct sk_buff *skb,\n--\nnet/mctp/device.c-97-{\nnet/mctp/device.c:98:\tstruct mctp_dump_cb *mcb = (void *)cb-\u003ectx;\nnet/mctp/device.c-99-\tu32 portid, seq;\n--\nnet/mctp/device.c=114=static int mctp_dump_addrinfo(struct sk_buff *skb, struct netlink_callback *cb)\nnet/mctp/device.c-115-{\nnet/mctp/device.c:116:\tstruct mctp_dump_cb *mcb = (void *)cb-\u003ectx;\nnet/mctp/device.c-117-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/mctp/neigh.c=244=static int mctp_rtm_getneigh(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/mctp/neigh.c-251-\t\tint idx;\nnet/mctp/neigh.c:252:\t} *cbctx = (void *)cb-\u003ectx;\nnet/mctp/neigh.c-253-\n--\nnet/mpls/af_mpls.c=1348=static int mpls_netconf_dump_devconf(struct sk_buff *skb,\n--\nnet/mpls/af_mpls.c-1354-\t\tunsigned long ifindex;\nnet/mpls/af_mpls.c:1355:\t} *ctx = (void *)cb-\u003ectx;\nnet/mpls/af_mpls.c-1356-\tstruct net_device *dev;\n--\nnet/mptcp/mptcp_diag.c=75=static void mptcp_diag_dump_listeners(struct sk_buff *skb, struct netlink_callback *cb,\n--\nnet/mptcp/mptcp_diag.c-78-{\nnet/mptcp/mptcp_diag.c:79:\tstruct mptcp_diag_ctx *diag_ctx = (void *)cb-\u003ectx;\nnet/mptcp/mptcp_diag.c-80-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/mptcp/mptcp_diag.c=149=static void mptcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,\n--\nnet/mptcp/mptcp_diag.c-152-\tbool net_admin = netlink_net_capable(cb-\u003eskb, CAP_NET_ADMIN);\nnet/mptcp/mptcp_diag.c:153:\tstruct mptcp_diag_ctx *diag_ctx = (void *)cb-\u003ectx;\nnet/mptcp/mptcp_diag.c-154-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/mptcp/mptcp_diag.c-156-\nnet/mptcp/mptcp_diag.c:157:\tBUILD_BUG_ON(sizeof(cb-\u003ectx) \u003c sizeof(*diag_ctx));\nnet/mptcp/mptcp_diag.c-158-\n--\nnet/mptcp/pm_userspace.c=641=int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,\n--\nnet/mptcp/pm_userspace.c-652-\nnet/mptcp/pm_userspace.c:653:\tBUILD_BUG_ON(sizeof(struct id_bitmap) \u003e sizeof(cb-\u003ectx));\nnet/mptcp/pm_userspace.c-654-\nnet/mptcp/pm_userspace.c:655:\tbitmap = (struct id_bitmap *)cb-\u003ectx;\nnet/mptcp/pm_userspace.c-656-\n--\nnet/netfilter/nf_conntrack_netlink.c=1733=static int ctnetlink_dump_one_entry(struct sk_buff *skb,\n--\nnet/netfilter/nf_conntrack_netlink.c-1737-{\nnet/netfilter/nf_conntrack_netlink.c:1738:\tstruct ctnetlink_list_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_conntrack_netlink.c-1739-\tstruct nfgenmsg *nfmsg = nlmsg_data(cb-\u003enlh);\n--\nnet/netfilter/nf_conntrack_netlink.c=1778=ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)\nnet/netfilter/nf_conntrack_netlink.c-1779-{\nnet/netfilter/nf_conntrack_netlink.c:1780:\tstruct ctnetlink_list_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_conntrack_netlink.c-1781-#ifdef CONFIG_NF_CONNTRACK_EVENTS\n--\nnet/netfilter/nf_tables_api.c=3894=static int __nf_tables_dump_rules(struct sk_buff *skb,\n--\nnet/netfilter/nf_tables_api.c-3899-{\nnet/netfilter/nf_tables_api.c:3900:\tstruct nft_rule_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-3901-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/netfilter/nf_tables_api.c=3941=static int nf_tables_dump_rules(struct sk_buff *skb,\n--\nnet/netfilter/nf_tables_api.c-3944-\tconst struct nfgenmsg *nfmsg = nlmsg_data(cb-\u003enlh);\nnet/netfilter/nf_tables_api.c:3945:\tstruct nft_rule_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-3946-\tstruct nft_table *table;\n--\nnet/netfilter/nf_tables_api.c=3998=static int nf_tables_dump_rules_start(struct netlink_callback *cb)\nnet/netfilter/nf_tables_api.c-3999-{\nnet/netfilter/nf_tables_api.c:4000:\tstruct nft_rule_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-4001-\tconst struct nlattr * const *nla = cb-\u003edata;\nnet/netfilter/nf_tables_api.c-4002-\nnet/netfilter/nf_tables_api.c:4003:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/netfilter/nf_tables_api.c-4004-\n--\nnet/netfilter/nf_tables_api.c=4023=static int nf_tables_dump_rules_done(struct netlink_callback *cb)\nnet/netfilter/nf_tables_api.c-4024-{\nnet/netfilter/nf_tables_api.c:4025:\tstruct nft_rule_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-4026-\n--\nnet/netfilter/nf_tables_api.c=8479=static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/netfilter/nf_tables_api.c-8481-\tconst struct nfgenmsg *nfmsg = nlmsg_data(cb-\u003enlh);\nnet/netfilter/nf_tables_api.c:8482:\tstruct nft_obj_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-8483-\tstruct net *net = sock_net(skb-\u003esk);\n--\nnet/netfilter/nf_tables_api.c=8538=static int nf_tables_dump_obj_start(struct netlink_callback *cb)\nnet/netfilter/nf_tables_api.c-8539-{\nnet/netfilter/nf_tables_api.c:8540:\tstruct nft_obj_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-8541-\tconst struct nlattr * const *nla = cb-\u003edata;\nnet/netfilter/nf_tables_api.c-8542-\nnet/netfilter/nf_tables_api.c:8543:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/netfilter/nf_tables_api.c-8544-\n--\nnet/netfilter/nf_tables_api.c=8560=static int nf_tables_dump_obj_done(struct netlink_callback *cb)\nnet/netfilter/nf_tables_api.c-8561-{\nnet/netfilter/nf_tables_api.c:8562:\tstruct nft_obj_dump_ctx *ctx = (void *)cb-\u003ectx;\nnet/netfilter/nf_tables_api.c-8563-\n--\nnet/netlink/genetlink.c=1530=static int ctrl_dumppolicy_start(struct netlink_callback *cb)\n--\nnet/netlink/genetlink.c-1532-\tconst struct genl_dumpit_info *info = genl_dumpit_info(cb);\nnet/netlink/genetlink.c:1533:\tstruct ctrl_dump_policy_ctx *ctx = (void *)cb-\u003ectx;\nnet/netlink/genetlink.c-1534-\tstruct nlattr **tb = info-\u003einfo.attrs;\n--\nnet/netlink/genetlink.c-1538-\nnet/netlink/genetlink.c:1539:\tBUILD_BUG_ON(sizeof(*ctx) \u003e sizeof(cb-\u003ectx));\nnet/netlink/genetlink.c-1540-\n--\nnet/netlink/genetlink.c=1640=static void *ctrl_dumppolicy_prep(struct sk_buff *skb,\n--\nnet/netlink/genetlink.c-1642-{\nnet/netlink/genetlink.c:1643:\tstruct ctrl_dump_policy_ctx *ctx = (void *)cb-\u003ectx;\nnet/netlink/genetlink.c-1644-\tvoid *hdr;\n--\nnet/netlink/genetlink.c=1658=static int ctrl_dumppolicy_put_op(struct sk_buff *skb,\n--\nnet/netlink/genetlink.c-1662-{\nnet/netlink/genetlink.c:1663:\tstruct ctrl_dump_policy_ctx *ctx = (void *)cb-\u003ectx;\nnet/netlink/genetlink.c-1664-\tstruct nlattr *nest_pol, *nest_op;\n--\nnet/netlink/genetlink.c=1711=static int ctrl_dumppolicy(struct sk_buff *skb, struct netlink_callback *cb)\nnet/netlink/genetlink.c-1712-{\nnet/netlink/genetlink.c:1713:\tstruct ctrl_dump_policy_ctx *ctx = (void *)cb-\u003ectx;\nnet/netlink/genetlink.c-1714-\tvoid *hdr;\n--\nnet/netlink/genetlink.c=1767=static int ctrl_dumppolicy_done(struct netlink_callback *cb)\nnet/netlink/genetlink.c-1768-{\nnet/netlink/genetlink.c:1769:\tstruct ctrl_dump_policy_ctx *ctx = (void *)cb-\u003ectx;\nnet/netlink/genetlink.c-1770-\n--\nnet/sched/sch_api.c=1911=static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/sched/sch_api.c-1918-\t\tint q_idx;\nnet/sched/sch_api.c:1919:\t} *ctx = (void *)cb-\u003ectx;\nnet/sched/sch_api.c-1920-\tconst struct tcmsg *tcm;\n--\nnet/shaper/shaper.c=768=int net_shaper_nl_pre_dumpit(struct netlink_callback *cb)\nnet/shaper/shaper.c-769-{\nnet/shaper/shaper.c:770:\tstruct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb-\u003ectx;\nnet/shaper/shaper.c-771-\tconst struct genl_info *info = genl_info_dump(cb);\n--\nnet/shaper/shaper.c=776=int net_shaper_nl_post_dumpit(struct netlink_callback *cb)\nnet/shaper/shaper.c-777-{\nnet/shaper/shaper.c:778:\tnet_shaper_ctx_cleanup((struct net_shaper_nl_ctx *)cb-\u003ectx);\nnet/shaper/shaper.c-779-\treturn 0;\n--\nnet/shaper/shaper.c=794=int net_shaper_nl_cap_pre_dumpit(struct netlink_callback *cb)\nnet/shaper/shaper.c-795-{\nnet/shaper/shaper.c:796:\tstruct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb-\u003ectx;\nnet/shaper/shaper.c-797-\n--\nnet/shaper/shaper.c=802=int net_shaper_nl_cap_post_dumpit(struct netlink_callback *cb)\nnet/shaper/shaper.c-803-{\nnet/shaper/shaper.c:804:\tstruct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb-\u003ectx;\nnet/shaper/shaper.c-805-\n--\nnet/shaper/shaper.c=853=int net_shaper_nl_get_dumpit(struct sk_buff *skb,\n--\nnet/shaper/shaper.c-855-{\nnet/shaper/shaper.c:856:\tstruct net_shaper_nl_ctx *ctx = (struct net_shaper_nl_ctx *)cb-\u003ectx;\nnet/shaper/shaper.c-857-\tconst struct genl_info *info = genl_info_dump(cb);\n--\nnet/shaper/shaper.c=1435=int net_shaper_nl_cap_get_dumpit(struct sk_buff *skb,\n--\nnet/shaper/shaper.c-1443-\nnet/shaper/shaper.c:1444:\tbinding = net_shaper_binding_from_ctx(cb-\u003ectx);\nnet/shaper/shaper.c-1445-\tops = net_shaper_ops(binding);\n--\nnet/smc/smc_diag.c=30=static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)\nnet/smc/smc_diag.c-31-{\nnet/smc/smc_diag.c:32:\treturn (struct smc_diag_dump_ctx *)cb-\u003ectx;\nnet/smc/smc_diag.c-33-}\n"
} |
| 91/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 71647 output: 18 thoughts: 56 Thoughts: **Analyzing the Netlink Dump Context** Okay, so I'm diving into this netlink dump process. The first thing I'm looking at is this `cb` structure. Right, I know it's being allocated either through `kzalloc` or `memset(0)` in the `netlink_dump_start` function. That's good, predictable initialization. Now, I want to drill down and confirm *exactly* how `cb` is allocated and initialized within `netlink_dump_start`. I need to fully understand its initial state before I can go any further with my analysis. |
| 92/3 | 2026/09/14 02:42 | tool | grepper |
0mArgs:{
"Expression": "cb = kzalloc"
}Results: {
"Output": "arch/s390/kernel/guarded_storage.c=22=static int gs_enable(void)\n--\narch/s390/kernel/guarded_storage.c-26-\tif (!current-\u003ethread.gs_cb) {\narch/s390/kernel/guarded_storage.c:27:\t\tgs_cb = kzalloc_obj(*gs_cb);\narch/s390/kernel/guarded_storage.c-28-\t\tif (!gs_cb)\n--\narch/s390/kernel/guarded_storage.c=52=static int gs_set_bc_cb(struct gs_cb __user *u_gs_cb)\n--\narch/s390/kernel/guarded_storage.c-57-\tif (!gs_cb) {\narch/s390/kernel/guarded_storage.c:58:\t\tgs_cb = kzalloc_obj(*gs_cb);\narch/s390/kernel/guarded_storage.c-59-\t\tif (!gs_cb)\n--\narch/s390/kernel/perf_pai.c=244=static int pai_alloc_cpu(struct perf_event *event, int cpu)\n--\narch/s390/kernel/perf_pai.c-287-\t\t\tcpump-\u003earea = kzalloc(pai_pmu[idx].area_size, GFP_KERNEL);\narch/s390/kernel/perf_pai.c:288:\t\t\tcpump-\u003epaiext_cb = kzalloc(PAIE1_CB_SZ, GFP_KERNEL);\narch/s390/kernel/perf_pai.c-289-\t\t\tneed_paiext_cb = true;\n--\narch/s390/kernel/runtime_instr.c=70=SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum)\n--\narch/s390/kernel/runtime_instr.c-85-\tif (!current-\u003ethread.ri_cb) {\narch/s390/kernel/runtime_instr.c:86:\t\tcb = kzalloc_obj(*cb);\narch/s390/kernel/runtime_instr.c-87-\t\tif (!cb)\n--\nblock/blk-core.c=1241=struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, void *data,\n--\nblock/blk-core.c-1255-\tBUG_ON(size \u003c sizeof(*cb));\nblock/blk-core.c:1256:\tcb = kzalloc(size, GFP_ATOMIC);\nblock/blk-core.c-1257-\tif (cb) {\n--\ndrivers/accel/habanalabs/common/command_buffer.c=103=static struct hl_cb *hl_cb_alloc(struct hl_device *hdev, u32 cb_size,\n--\ndrivers/accel/habanalabs/common/command_buffer.c-118-\tif (ctx_id == HL_KERNEL_ASID_ID \u0026\u0026 !hdev-\u003edisabled)\ndrivers/accel/habanalabs/common/command_buffer.c:119:\t\tcb = kzalloc_obj(*cb, GFP_ATOMIC);\ndrivers/accel/habanalabs/common/command_buffer.c-120-\ndrivers/accel/habanalabs/common/command_buffer.c-121-\tif (!cb)\ndrivers/accel/habanalabs/common/command_buffer.c:122:\t\tcb = kzalloc_obj(*cb);\ndrivers/accel/habanalabs/common/command_buffer.c-123-\n--\ndrivers/android/binder.c=2025=static void binder_deferred_fd_close(int fd)\n--\ndrivers/android/binder.c-2028-\ndrivers/android/binder.c:2029:\ttwcb = kzalloc_obj(*twcb);\ndrivers/android/binder.c-2030-\tif (!twcb)\n--\ndrivers/dma-buf/dma-fence.c=899=dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count,\n--\ndrivers/dma-buf/dma-fence.c-919-\ndrivers/dma-buf/dma-fence.c:920:\tcb = kzalloc_objs(struct default_wait_cb, count);\ndrivers/dma-buf/dma-fence.c-921-\tif (cb == NULL) {\n--\ndrivers/dma/mediatek/mtk-hsdma.c=314=static int mtk_hsdma_alloc_pchan(struct mtk_hsdma_device *hsdma,\n--\ndrivers/dma/mediatek/mtk-hsdma.c-336-\ndrivers/dma/mediatek/mtk-hsdma.c:337:\tring-\u003ecb = kzalloc_objs(*ring-\u003ecb, MTK_DMA_SIZE, GFP_NOWAIT);\ndrivers/dma/mediatek/mtk-hsdma.c-338-\tif (!ring-\u003ecb) {\n--\ndrivers/gpu/drm/nouveau/dispnv50/disp.c=2832=nv50_display_create(struct drm_device *dev)\n--\ndrivers/gpu/drm/nouveau/dispnv50/disp.c-2927-\ndrivers/gpu/drm/nouveau/dispnv50/disp.c:2928:\t\toutp-\u003edcb = kzalloc_obj(*outp-\u003edcb);\ndrivers/gpu/drm/nouveau/dispnv50/disp.c-2929-\t\tif (!outp-\u003edcb)\n--\ndrivers/irqchip/irq-crossbar.c=201=static int __init crossbar_of_init(struct device_node *node)\n--\ndrivers/irqchip/irq-crossbar.c-207-\ndrivers/irqchip/irq-crossbar.c:208:\tcb = kzalloc_obj(*cb);\ndrivers/irqchip/irq-crossbar.c-209-\n--\ndrivers/media/common/siano/smscoreapi.c=615=smscore_buffer_t *smscore_createbuffer(u8 *buffer, void *common_buffer,\n--\ndrivers/media/common/siano/smscoreapi.c-619-\ndrivers/media/common/siano/smscoreapi.c:620:\tcb = kzalloc_obj(*cb);\ndrivers/media/common/siano/smscoreapi.c-621-\tif (!cb)\n--\ndrivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c=1231=static void rockchip_vpu981_av1_dec_set_fgs(struct hantro_ctx *ctx)\n--\ndrivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c-1272-\tar_coeffs_y = kzalloc(sizeof(int32_t) * 24, GFP_KERNEL);\ndrivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c:1273:\tar_coeffs_cb = kzalloc(sizeof(int32_t) * 25, GFP_KERNEL);\ndrivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c-1274-\tar_coeffs_cr = kzalloc(sizeof(int32_t) * 25, GFP_KERNEL);\n--\ndrivers/mfd/ucb1x00-core.c=501=static int ucb1x00_probe(struct mcp *mcp)\n--\ndrivers/mfd/ucb1x00-core.c-521-\ndrivers/mfd/ucb1x00-core.c:522:\tucb = kzalloc_obj(struct ucb1x00);\ndrivers/mfd/ucb1x00-core.c-523-\tret = -ENOMEM;\n--\ndrivers/misc/mei/client.c=367=static struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl,\n--\ndrivers/misc/mei/client.c-372-\ndrivers/misc/mei/client.c:373:\tcb = kzalloc_obj(*cb);\ndrivers/misc/mei/client.c-374-\tif (!cb)\n--\ndrivers/net/ethernet/hisilicon/hns/hnae.c=195=hnae_init_ring(struct hnae_queue *q, struct hnae_ring *ring, int flags)\n--\ndrivers/net/ethernet/hisilicon/hns/hnae.c-210-\ndrivers/net/ethernet/hisilicon/hns/hnae.c:211:\tring-\u003edesc_cb = kzalloc_objs(ring-\u003edesc_cb[0], ring-\u003edesc_num);\ndrivers/net/ethernet/hisilicon/hns/hnae.c-212-\tif (!ring-\u003edesc_cb) {\n--\ndrivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c=67=static struct hnae_handle *hns_ae_get_handle(struct hnae_ae_dev *dev,\n--\ndrivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c-83-\ndrivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c:84:\tvf_cb = kzalloc_flex(*vf_cb, ae_handle.qs, qnum_per_vf);\ndrivers/net/ethernet/hisilicon/hns/hns_ae_adapt.c-85-\tif (unlikely(!vf_cb)) {\n--\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c=255=int qlcnic_register_dcb(struct qlcnic_adapter *adapter)\n--\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c-261-\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c:262:\tdcb = kzalloc_obj(struct qlcnic_dcb, GFP_ATOMIC);\ndrivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c-263-\tif (!dcb)\n--\ndrivers/net/wireless/rsi/rsi_91x_coex.c=139=int rsi_coex_attach(struct rsi_common *common)\n--\ndrivers/net/wireless/rsi/rsi_91x_coex.c-143-\ndrivers/net/wireless/rsi/rsi_91x_coex.c:144:\tcoex_cb = kzalloc_obj(*coex_cb);\ndrivers/net/wireless/rsi/rsi_91x_coex.c-145-\tif (!coex_cb)\n--\ndrivers/s390/char/sclp_cmd.c=126=static int do_core_configure(sclp_cmdw_t cmd)\n--\ndrivers/s390/char/sclp_cmd.c-136-\t */\ndrivers/s390/char/sclp_cmd.c:137:\tsccb = kzalloc_obj(*sccb, GFP_KERNEL | GFP_DMA);\ndrivers/s390/char/sclp_cmd.c-138-\tif (!sccb)\n--\ndrivers/scsi/initio.c=2802=static int initio_probe_one(struct pci_dev *pdev,\n--\ndrivers/scsi/initio.c-2850-\t\ti = num_scb * sizeof(struct scsi_ctrl_blk);\ndrivers/scsi/initio.c:2851:\t\tscb = kzalloc(i, GFP_KERNEL);\ndrivers/scsi/initio.c-2852-\t\tif (scb)\n--\ndrivers/scsi/lpfc/lpfc_nportdisc.c=357=lpfc_rcv_plogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,\n--\ndrivers/scsi/lpfc/lpfc_nportdisc.c-567-\ndrivers/scsi/lpfc/lpfc_nportdisc.c:568:\tsave_iocb = kzalloc_obj(*save_iocb);\ndrivers/scsi/lpfc/lpfc_nportdisc.c-569-\tif (!save_iocb)\n--\ndrivers/scsi/qla4xxx/ql4_mbx.c=2342=int qla4_84xx_config_acb(struct scsi_qla_host *ha, int acb_config)\n--\ndrivers/scsi/qla4xxx/ql4_mbx.c-2371-\t\tif (!ha-\u003esaved_acb)\ndrivers/scsi/qla4xxx/ql4_mbx.c:2372:\t\t\tha-\u003esaved_acb = kzalloc(acb_len, GFP_KERNEL);\ndrivers/scsi/qla4xxx/ql4_mbx.c-2373-\n--\ndrivers/scsi/stex.c=1653=static int stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)\n--\ndrivers/scsi/stex.c-1759-\ndrivers/scsi/stex.c:1760:\thba-\u003eccb = kzalloc_objs(struct st_ccb, ci-\u003erq_count);\ndrivers/scsi/stex.c-1761-\tif (!hba-\u003eccb) {\n--\nfs/nfs/localio.c=313=nfs_local_iocb_alloc(struct nfs_pgio_header *hdr,\n--\nfs/nfs/localio.c-317-\nfs/nfs/localio.c:318:\tiocb = kzalloc_obj(*iocb, flags);\nfs/nfs/localio.c-319-\tif (iocb == NULL)\n--\nfs/nfsd/nfs4callback.c=1980=int nfsd_net_cb_init(struct nfsd_net *nn)\n--\nfs/nfsd/nfs4callback.c-1983-\nfs/nfsd/nfs4callback.c:1984:\tcb = kzalloc_obj(*cb);\nfs/nfsd/nfs4callback.c-1985-\tif (!cb)\n--\nfs/ntfs3/fslog.c=2498=static int read_log_rec_lcb(struct ntfs_log *log, u64 lsn, u32 ctx_mode,\n--\nfs/ntfs3/fslog.c-2519-\nfs/ntfs3/fslog.c:2520:\tlcb = kzalloc_obj(struct lcb, GFP_NOFS);\nfs/ntfs3/fslog.c-2521-\tif (!lcb)\n--\nkernel/cgroup/cpuset.c=2645=static void schedule_flush_migrate_mm(void)\n--\nkernel/cgroup/cpuset.c-2648-\nkernel/cgroup/cpuset.c:2649:\tflush_cb = kzalloc_obj(struct callback_head);\nkernel/cgroup/cpuset.c-2650-\tif (!flush_cb)\n--\nnet/core/flow_offload.c=259=struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,\n--\nnet/core/flow_offload.c-264-\nnet/core/flow_offload.c:265:\tblock_cb = kzalloc_obj(*block_cb);\nnet/core/flow_offload.c-266-\tif (!block_cb)\n"
} |
| 93/3 | 2026/09/14 02:42 | llm | kmsan-evaluator-compressor |
0mModel:gemini-3.8-flash Args: null Results: null Reply: ### Workspace & Investigation Summary
#### 1. Context & Goal
- **Goal**: Evaluate whether the patch series adding AF_PACKET support to `RTM_GETMULTICAST` dumps warrants spawning a dedicated KMSAN fuzzing session (`NeedsKMSAN=true` vs `NeedsKMSAN=false`).
- **Core Rule**: KMSAN is strictly for uninitialized memory reads (heap, stack, page alloc) and kernel-to-user info-leaks. Memory corruption, UAF, double frees, out-of-bounds, locking bugs are caught by standard KASAN/LOCKDEP builds. A dedicated KMSAN session is only justified if uninitialized memory risks are introduced or exposed.
---
#### 2. Patch Overview
The patch adds netlink multicast address dumping for `AF_PACKET` link-layer addresses:
1. `Documentation/netlink/specs/rt-addr.yaml`:
- Adds `global` flag and `s32` type for `target-netnsid`.
- Documents AF_PACKET family for getmulticast.
2. `include/uapi/linux/if_addr.h`:
- Defines `#define IFA_F_GLOBAL 0x1000`.
3. `net/core/rtnetlink.c`:
- `rtnl_fill_mcaddr()`: Builds `skb` with `struct ifaddrmsg` + netlink attributes (`IFA_TARGET_NETNSID`, `IFA_MULTICAST`, `IFA_MC_USERS`, `IFA_FLAGS`).
- `rtnl_dump_mcaddr_dev()`: Iterates `netdev_for_each_mc_addr(ha, dev)` under `netif_addr_lock_bh(dev)`, calls `rtnl_fill_mcaddr()`.
- `rtnl_valid_dump_mcaddr_req()`: Validates input `struct ifaddrmsg` request and netlink attributes using `rtnl_mcaddr_dump_policy`. Supports `IFA_TARGET_NETNSID`.
- `rtnl_dump_mcaddr()`: Dump handler iterating netdevs via `for_each_netdev_dump()` or single device via `dev_get_by_index_rcu()`.
- Registers message handler: `{.protocol = PF_PACKET, .msgtype = RTM_GETMULTICAST, .dumpit = rtnl_dump_mcaddr, .flags = RTNL_FLAG_DUMP_UNLOCKED}`.
4. `tools/testing/selftests/net/rtnetlink.py`:
- Selftest `dump_mcaddr_l2_check()` testing device filtering, `mc-users`, `global` flag, and `target-netnsid`.
---
#### 3. Investigation Approaches & Findings
##### A. Header & Structure Padding Leak Analysis
- **`struct ifaddrmsg` Inspection** (`include/uapi/linux/if_addr.h:8-14`):
```c
struct ifaddrmsg {
__u8 ifa_family;
__u8 ifa_prefixlen;
__u8 ifa_flags;
__u8 ifa_scope;
__u32 ifa_index;
};
```
- Total size: 8 bytes (`4 * 1 byte + 4 bytes = 8 bytes`).
- Alignment: 4-byte aligned, 0 internal holes or padding bytes.
- Initialized fields in `rtnl_fill_mcaddr`:
```c
ifm->ifa_family = AF_PACKET;
ifm->ifa_prefixlen = 0;
ifm->ifa_flags = (__u8)ifa_flags;
ifm->ifa_scope = RT_SCOPE_LINK;
ifm->ifa_index = dev->ifindex;
```
- Every single field is fully initialized.
- `nlmsg_put()` -> `__nlmsg_put()` (`net/netlink/af_netlink.c:2145`):
```c
if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size);
```
Tail padding for `NLMSG_ALIGN` is explicitly zeroed with `memset`.
##### B. Attribute Padding Analysis
- Attributes put in `rtnl_fill_mcaddr`:
- `nla_put_s32(skb, IFA_TARGET_NETNSID, netnsid)`: 4 bytes payload, aligned, padded if needed.
- `nla_put(skb, IFA_MULTICAST, dev->addr_len, ha->addr)`: copies `dev->addr_len` bytes.
- `nla_put_u32(skb, IFA_MC_USERS, ha->refcount)`: 4 bytes payload.
- `nla_put_u32(skb, IFA_FLAGS, ifa_flags)`: 4 bytes payload.
- `nla_put()` calls `__nla_put()` (`lib/nlattr.c:1035`), which calls `__nla_reserve()` (`lib/nlattr.c:902`):
```c
struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
{
struct nlattr *nla;
nla = skb_put(skb, nla_total_size(attrlen));
nla->nla_type = attrtype;
nla->nla_len = nla_attr_size(attrlen);
memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen));
return nla;
}
```
`__nla_reserve` explicitly memsets the padding (`nla_padlen(attrlen)`) to 0. No leak via netlink attribute alignment padding.
##### C. Hardware Multicast Address Source Buffer Initialization
- `ha` is `struct netdev_hw_addr` (`include/linux/netdevice.h:237`):
```c
struct netdev_hw_addr {
struct list_head list;
struct rb_node node;
unsigned char addr[MAX_ADDR_LEN]; // MAX_ADDR_LEN = 32
unsigned char type;
bool global_use;
int sync_cnt;
int refcount;
int synced;
struct rcu_head rcu_head;
};
```
- Address creation in `net/core/dev_addr_lists.c:52` (`__hw_addr_create`):
```c
ha = kmalloc(alloc_size, GFP_ATOMIC);
if (!ha) return NULL;
memcpy(ha->addr, addr, addr_len);
```
`addr_len` passed to `__hw_addr_create` is `dev->addr_len`.
While `ha->addr` has capacity `MAX_ADDR_LEN` (32) and bytes beyond `dev->addr_len` are uninitialized, `rtnl_fill_mcaddr` does:
```c
nla_put(skb, IFA_MULTICAST, dev->addr_len, ha->addr)
```
It copies exactly `dev->addr_len` bytes from `ha->addr`. Bytes past `dev->addr_len` are NEVER read or copied to user space.
##### D. Control Flow & Uninitialized Local Variables in `rtnl_dump_mcaddr`
- Stack variable `struct rtnl_mcaddr_dump_filter filter`:
```c
struct rtnl_mcaddr_dump_filter filter = {
.tgt_net = sock_net(skb->sk),
.netnsid = -1,
};
```
C designated initializer guarantees zero-initialization of remaining fields (`ns_tracker` zeroed, `ifindex = 0`).
- Netlink parse policy `rtnl_mcaddr_dump_policy` enforces `NLA_S32`.
- Iteration context `ctx = (void *)cb->ctx`:
Kernel zeroes `cb->ctx` before dump starts (`netlink_dump()`).
`ctx->ifindex` and `ctx->addr_idx` are safely read and updated.
---
#### 4. Active Hypotheses & Conclusion
- **Hypothesis**: All data exposed or transmitted to userspace is properly initialized and padded:
- `struct ifaddrmsg` has 0 padding bytes and all fields are assigned.
- `__nlmsg_put` zeroes netlink message header padding.
- `__nla_reserve` zeroes netlink attribute padding.
- `ha->addr` payload read is bounded strictly to `dev->addr_len` bytes (which matches what was written during `__hw_addr_create`).
- All local/filter stack structures are zero-initialized.
- There are no uninitialized variables controlling branches, no info leaks, and no uninitialized memory operations.
- **KASAN vs KMSAN Distinction**: Any potential race conditions, lockdep issues (e.g. `RTNL_FLAG_DUMP_UNLOCKED`, `rcu_read_lock`, `netif_addr_lock_bh`), or out-of-bounds access would be detected by KASAN/LOCKDEP, not KMSAN.
- **Decision**: `NeedsKMSAN = false`.
#### 5. Next Steps
- Execute `set-results` with `NeedsKMSAN=false` and provide detailed rationale contrasting KASAN vs KMSAN.Tokens: input: 56464 output: 2250 thoughts: 0 |
| 94/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 26948 output: 19 thoughts: 32 Thoughts: Here's a breakdown of my thought process: **Diving into Netlink Dumping: `cb` Allocation** Alright, time to dig into the netlink dumping process. My immediate concern is how the `cb` structure is allocated and initialized. This is a crucial first step in understanding the flow, especially when debugging or extending the netlink functionality. The core question is: where and how do we set up this central control block? Specifically, I'm going to focus my attention on `net/netlink/af_netlink.c`, which is the logical place to start looking, given its role in the AF_NETLINK address family. I suspect the answer likely lies within the initialization or receive path of the netlink socket. Understanding this is key to deciphering how the kernel manages netlink messages. |
| 95/3 | 2026/09/14 02:42 | tool | grepper |
0mArgs:{
"Expression": "memset.*cb-\u003ectx"
}Results: {
"Output": "net/core/rtnetlink.c=6836=static int rtnl_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)\n--\nnet/core/rtnetlink.c-6866-\t\t */\nnet/core/rtnetlink.c:6867:\t\tmemset(cb-\u003ectx, 0, sizeof(cb-\u003ectx));\nnet/core/rtnetlink.c-6868-\t\tcb-\u003eprev_seq = 0;\n"
} |
| 96/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 27299 output: 29 thoughts: 33 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Tracing the Allocation of the Netlink Callback** Alright, time to get to the root of this. I need to understand how the netlink callback is being set up. My initial thought is to dive straight into the heart of the matter – the `netlink_dump` function. I'll need to locate it within `net/netlink/af_netlink.c`, that's where the core netlink functionality resides. Specifically, I'm zeroing in on where the `cb` variable, which I know represents the callback structure, is allocated and initialized. That's the key: understanding the lifecycle of that callback will shed light on how the system handles the dumping process and the potential for any issues I'm investigating. This is a good starting point; it's always best to start with the fundamental code path. |
| 97/3 | 2026/09/14 02:42 | tool | grepper |
0mArgs:{
"Expression": "netlink_dump\\(",
"PathPrefix": "net/netlink"
}Results: {
"Output": "net/netlink/af_netlink.c=98=static const char *const nlk_cb_mutex_key_strings[MAX_LINKS + 1] = {\n--\nnet/netlink/af_netlink.c-133-\nnet/netlink/af_netlink.c:134:static int netlink_dump(struct sock *sk, bool lock_taken);\nnet/netlink/af_netlink.c-135-\n--\nnet/netlink/af_netlink.c=1907=static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,\n--\nnet/netlink/af_netlink.c-1981-\t atomic_read(\u0026sk-\u003esk_rmem_alloc) \u003c= sk-\u003esk_rcvbuf / 2) {\nnet/netlink/af_netlink.c:1982:\t\tret = netlink_dump(sk, false);\nnet/netlink/af_netlink.c-1983-\t\tif (ret) {\n--\nnet/netlink/af_netlink.c=2231=static int netlink_dump_done(struct netlink_sock *nlk, struct sk_buff *skb,\n--\nnet/netlink/af_netlink.c-2258-\nnet/netlink/af_netlink.c:2259:static int netlink_dump(struct sock *sk, bool lock_taken)\nnet/netlink/af_netlink.c-2260-{\n--\nnet/netlink/af_netlink.c=2392=int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,\n--\nnet/netlink/af_netlink.c-2445-\nnet/netlink/af_netlink.c:2446:\tret = netlink_dump(sk, true);\nnet/netlink/af_netlink.c-2447-\n"
} |
| 98/3 | 2026/09/14 02:42 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 28057 output: 40 thoughts: 27 Thoughts: Okay, here's my interpretation of that thought process, assuming I'm already quite familiar with networking internals: **Diving into Netlink's Dump Mechanism** Alright, time to dig into the heart of a Netlink dump operation. The code I'm focusing on right now is `__netlink_dump_start` within `net/netlink/af_netlink.c`. I need to refresh my memory on the intricacies of the dump mechanism. Specifically, I need to look at how a netlink socket kicks off a multi-part retrieval of data, often used for things like listing routes, interfaces, or other kernel objects. I'm already assuming I have a pretty solid grasp of the general netlink concepts; so this is more about the precise mechanics of starting this particular retrieval process. I'm keen to understand how the kernel handles the request, initializes the necessary state, and sets up the iterators (if any) to deliver the information back to the user-space application. What are the key data structures used for this? How is the initial socket buffer populated, and how is the "dump context" handled as a whole? Let's get to the source code and uncover these specifics. |
| 99/3 | 2026/09/14 02:43 | tool | read-file |
0mArgs:{
"File": "net/netlink/af_netlink.c",
"FirstLine": 2400,
"LineCount": 50
}Results: {
"Contents": "2400:\t\n2401:\t\trefcount_inc(\u0026skb-\u003eusers);\n2402:\t\n2403:\t\tsk = netlink_lookup(sock_net(ssk), ssk-\u003esk_protocol, NETLINK_CB(skb).portid);\n2404:\t\tif (sk == NULL) {\n2405:\t\t\tret = -ECONNREFUSED;\n2406:\t\t\tgoto error_free;\n2407:\t\t}\n2408:\t\n2409:\t\tnlk = nlk_sk(sk);\n2410:\t\tmutex_lock(\u0026nlk-\u003enl_cb_mutex);\n2411:\t\t/* A dump is in progress... */\n2412:\t\tif (nlk-\u003ecb_running) {\n2413:\t\t\tret = -EBUSY;\n2414:\t\t\tgoto error_unlock;\n2415:\t\t}\n2416:\t\t/* add reference of module which cb-\u003edump belongs to */\n2417:\t\tif (!try_module_get(control-\u003emodule)) {\n2418:\t\t\tret = -EPROTONOSUPPORT;\n2419:\t\t\tgoto error_unlock;\n2420:\t\t}\n2421:\t\n2422:\t\tcb = \u0026nlk-\u003ecb;\n2423:\t\tmemset(cb, 0, sizeof(*cb));\n2424:\t\tcb-\u003edump = control-\u003edump;\n2425:\t\tcb-\u003edone = control-\u003edone;\n2426:\t\tcb-\u003enlh = nlh;\n2427:\t\tcb-\u003edata = control-\u003edata;\n2428:\t\tcb-\u003emodule = control-\u003emodule;\n2429:\t\tcb-\u003emin_dump_alloc = control-\u003emin_dump_alloc;\n2430:\t\tcb-\u003eflags = control-\u003eflags;\n2431:\t\tcb-\u003eskb = skb;\n2432:\t\n2433:\t\tcb-\u003estrict_check = nlk_test_bit(STRICT_CHK, NETLINK_CB(skb).sk);\n2434:\t\n2435:\t\tif (control-\u003estart) {\n2436:\t\t\tcb-\u003eextack = control-\u003eextack;\n2437:\t\t\tret = control-\u003estart(cb);\n2438:\t\t\tcb-\u003eextack = NULL;\n2439:\t\t\tif (ret)\n2440:\t\t\t\tgoto error_put;\n2441:\t\t}\n2442:\t\n2443:\t\tWRITE_ONCE(nlk-\u003ecb_running, true);\n2444:\t\tnlk-\u003edump_done_errno = INT_MAX;\n2445:\t\n2446:\t\tret = netlink_dump(sk, true);\n2447:\t\n2448:\t\tsock_put(sk);\n2449:\t\n"
} |
| 100/3 | 2026/09/14 02:43 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 29101 output: 30 thoughts: 37 Thoughts: **Zeroing the Context** Okay, so `memset(cb, 0, sizeof(*cb));` – that's a straightforward initialization. It wipes the entire `cb` structure, including its `ctx` member. Now, I want to make absolutely sure I understand the scope of this operation. It's time to verify the size of `cb->ctx`, just to be certain that I am not overlooking something, ensuring my memory management is impeccable. |
| 101/3 | 2026/09/14 02:43 | tool | grepper |
0mError:no matches Args: {
"Expression": "ctx\\[",
"PathPrefix": "include/net/netlink.h"
}Results: {
"error": "no matches"
} |
| 102/3 | 2026/09/14 02:43 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 29278 output: 34 thoughts: 22 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Diving into the Netlink Callback Structure** Okay, time to get my hands dirty. I'm going to take a closer look at the `struct netlink_callback` definition. Specifically, I'm heading straight for `include/net/netlink.h`. I need to refresh my memory on the internal workings of that structure. I'm particularly interested in how the kernel handles asynchronous netlink operations and the flow control mechanisms. I need to understand its role in data retrieval, message handling, and any potential context switches. I suspect there are some subtle details in there related to memory management and potential race conditions that need careful consideration. Time to parse the code and verify my understanding. |
| 103/3 | 2026/09/14 02:43 | tool | grepper |
0mError:no matches Args: {
"Expression": "struct netlink_callback \\{",
"PathPrefix": "include/net/netlink.h"
}Results: {
"error": "no matches"
} |
| 104/3 | 2026/09/14 02:43 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 29510 output: 20 thoughts: 11 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Hunting Down `struct netlink_callback`** Okay, so I need to get my hands on `struct netlink_callback`. My first instinct is to dig directly into the kernel source, probably starting with the core Netlink headers. Let's see... I'll probably be looking in places like `include/linux/netlink.h` or maybe even `include/net/netlink.h`, depending on how things are structured in this specific kernel version. I'm assuming it's used for the asynchronous callback mechanism within the Netlink framework, handling messages and event processing. If it's a newer kernel, the organization of Netlink might have changed significantly, in which case I might need to consider other paths. I'll likely use `grep` or `cscope` to track down the exact definition and, more importantly, *where* it's used. I'm particularly interested in understanding how it's initialized and how callbacks are registered and invoked. Are there any per-netns instances? Any locking considerations to keep in mind? I need to analyze how it ties into the Netlink socket's receive path and the general event loop. It's crucial to understand the context of this struct within the kernel's overall Netlink implementation, not just its declaration. |
| 105/3 | 2026/09/14 02:43 | tool | grepper |
0mArgs:{
"Expression": "struct netlink_callback \\{"
}Results: {
"Output": "include/linux/netlink.h=251=netlink_skb_clone(struct sk_buff *skb, gfp_t gfp_mask)\n--\ninclude/linux/netlink.h-280-\ninclude/linux/netlink.h:281:struct netlink_callback {\ninclude/linux/netlink.h-282-\tstruct sk_buff\t\t*skb;\n"
} |
| 106/3 | 2026/09/14 02:43 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 29941 output: 36 thoughts: 21 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Diving into Netlink Header Structure** Okay, I need to refresh my memory on the core Netlink structure definitions. Let's start with `include/linux/netlink.h` and zero in on around line 281. I'm guessing that's where the definition for `nlmsghdr` (or possibly the related auxiliary structures like `nlmsgerr`) resides. I need to quickly visualize the base header layout. I'm mentally checking for the usual suspects: `nlmsg_len`, `nlmsg_type`, `nlmsg_flags`, and `nlmsg_seq`, `nlmsg_pid`. I'm especially interested in the flags field - specifically how they are used to control the message flow and delivery semantics. I'll need to double check any structures and how they link together - I should keep an eye out for any alignment issues, and potential padding that's used. Let's see if there are any interesting macros defined there that encapsulate the header access patterns. |
| 107/3 | 2026/09/14 02:43 | tool | read-file |
0mArgs:{
"File": "include/linux/netlink.h",
"FirstLine": 280,
"LineCount": 40
}Results: {
"Contents": " 280:\t\n 281:\tstruct netlink_callback {\n 282:\t\tstruct sk_buff\t\t*skb;\n 283:\t\tconst struct nlmsghdr\t*nlh;\n 284:\t\tint\t\t\t(*dump)(struct sk_buff * skb,\n 285:\t\t\t\t\t\tstruct netlink_callback *cb);\n 286:\t\tint\t\t\t(*done)(struct netlink_callback *cb);\n 287:\t\tvoid\t\t\t*data;\n 288:\t\t/* the module that dump function belong to */\n 289:\t\tstruct module\t\t*module;\n 290:\t\tstruct netlink_ext_ack\t*extack;\n 291:\t\tu16\t\t\tfamily;\n 292:\t\tu16\t\t\tanswer_flags;\n 293:\t\tu32\t\t\tmin_dump_alloc;\n 294:\t\tunsigned int\t\tprev_seq, seq;\n 295:\t\tint\t\t\tflags;\n 296:\t\tbool\t\t\tstrict_check;\n 297:\t\tunion {\n 298:\t\t\tu8\t\tctx[NETLINK_CTX_SIZE];\n 299:\t\n 300:\t\t\t/* args is deprecated. Cast a struct over ctx instead\n 301:\t\t\t * for proper type safety.\n 302:\t\t\t */\n 303:\t\t\tlong\t\targs[6];\n 304:\t\t};\n 305:\t};\n 306:\t\n 307:\t#define NL_ASSERT_CTX_FITS(type_name)\t\t\t\t\t\\\n 308:\t\tBUILD_BUG_ON(sizeof(type_name) \u003e\t\t\t\t\\\n 309:\t\t\t sizeof_field(struct netlink_callback, ctx))\n 310:\t\n 311:\tstruct netlink_notify {\n 312:\t\tstruct net *net;\n 313:\t\tu32 portid;\n 314:\t\tint protocol;\n 315:\t};\n 316:\t\n 317:\tstruct nlmsghdr *\n 318:\t__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags);\n 319:\t\n"
} |
| 108/3 | 2026/09/14 02:43 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 30803 output: 547 thoughts: 1768 Thoughts: **Analysis of Potential Uninitialized Memory Risks in Multicast Address Dumping** Okay, let's break this down. My concern is whether this patch introduces any uninitialized memory vulnerabilities when dumping multicast address information. I'm focusing on areas where data is potentially sent to user space or where logic might depend on uninitialized variables. First, I examined the `ifaddrmsg` structure and the `nlmsghdr`. `ifaddrmsg` seems safe. All its fields (`ifa_family`, `ifa_prefixlen`, etc.) are explicitly written to within `rtnl_fill_mcaddr`, and the `nlmsghdr` padding is taken care of by `nlmsg_put`. Next, I looked at the Netlink attributes. `IFA_TARGET_NETNSID`, `IFA_MC_USERS`, and `IFA_FLAGS` are all simple types (s32, u32) without any padding issues. Crucially, `IFA_MULTICAST`'s payload relies on `dev->addr_len`. The code uses `nla_put` to handle it, and this function includes a `memset` to zero the padding at the end of the attribute, if any. I did double-check that `ha->addr` data is actually initialized in `__hw_addr_create` with a `memcpy` of size `dev->addr_len`, so that's covered. I then considered conditional logic. I wanted to ensure that any branching wouldn't rely on uninitialized values. I see that the `filter` struct used in the dump process is initialized through designated initializers. This initializes it explicitly. Also, `cb->ctx` in the dump callback structure gets zeroed with `memset`. So, there's no risk of using uninitialized variables in any decision-making logic. Finally, regarding allocation and initialization of complex structures: I found nothing to be worried about in this part of the code. Based on this analysis, I'm concluding that this patch doesn't introduce any new uninitialized memory vulnerabilities. Any memory safety concerns (like RCU, locking, refcounts, and buffer bounds) are already handled by KASAN and LOCKDEP. KMSAN isn't necessary here. |
| 109/3 | 2026/09/14 02:43 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch series introduces AF_PACKET support for RTM_GETMULTICAST netlink dumps, adding rtnl_fill_mcaddr(), rtnl_dump_mcaddr_dev(), and rtnl_dump_mcaddr().\n\nDetailed analysis of memory safety and sanitizers applicability:\n1. Kernel-to-user info leaks:\n - The message payload header `struct ifaddrmsg` contains five fields (ifa_family, ifa_prefixlen, ifa_flags, ifa_scope, ifa_index) totaling 8 bytes with zero padding holes. All 5 fields are explicitly assigned in rtnl_fill_mcaddr().\n - Alignment padding in netlink message headers and netlink attributes is automatically zeroed by __nlmsg_put() and __nla_reserve() (via memset()).\n - The link-layer hardware address attribute IFA_MULTICAST copies exactly `dev-\u003eaddr_len` bytes from `ha-\u003eaddr`. When `struct netdev_hw_addr` is allocated and added (in __hw_addr_create), `dev-\u003eaddr_len` bytes are populated into `ha-\u003eaddr`. Thus no uninitialized bytes past `dev-\u003eaddr_len` are ever read or exposed.\n - Other attributes (IFA_TARGET_NETNSID, IFA_MC_USERS, IFA_FLAGS) are 4-byte scalar integers with no uninitialized bytes or padding.\n\n2. Uninitialized variables / conditional branches:\n - Local stack structure `struct rtnl_mcaddr_dump_filter filter` is initialized with designated initializers, guaranteeing that all other fields (ns_tracker, ifindex) are zeroed.\n - The netlink dump state `cb-\u003ectx` is guaranteed zero-initialized by __netlink_dump_start() via memset().\n\n3. KASAN vs KMSAN:\n - The potential risks introduced by this patch involve RCU lifetime (RCU read locks, dev_get_by_index_rcu), locking (netif_addr_lock_bh), netns tracking reference counts (put_net_track), and skb length limits (-EMSGSIZE / nlmsg_cancel). All of these are monitored and caught by standard debug builds (KASAN, LOCKDEP, refcount checks).\n - There are no uninitialized memory reads or information leaks that would be unique to KMSAN.\n\nTherefore, dedicated KMSAN fuzzing is not needed.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch series introduces AF_PACKET support for RTM_GETMULTICAST netlink dumps, adding rtnl_fill_mcaddr(), rtnl_dump_mcaddr_dev(), and rtnl_dump_mcaddr().\n\nDetailed analysis of memory safety and sanitizers applicability:\n1. Kernel-to-user info leaks:\n - The message payload header `struct ifaddrmsg` contains five fields (ifa_family, ifa_prefixlen, ifa_flags, ifa_scope, ifa_index) totaling 8 bytes with zero padding holes. All 5 fields are explicitly assigned in rtnl_fill_mcaddr().\n - Alignment padding in netlink message headers and netlink attributes is automatically zeroed by __nlmsg_put() and __nla_reserve() (via memset()).\n - The link-layer hardware address attribute IFA_MULTICAST copies exactly `dev-\u003eaddr_len` bytes from `ha-\u003eaddr`. When `struct netdev_hw_addr` is allocated and added (in __hw_addr_create), `dev-\u003eaddr_len` bytes are populated into `ha-\u003eaddr`. Thus no uninitialized bytes past `dev-\u003eaddr_len` are ever read or exposed.\n - Other attributes (IFA_TARGET_NETNSID, IFA_MC_USERS, IFA_FLAGS) are 4-byte scalar integers with no uninitialized bytes or padding.\n\n2. Uninitialized variables / conditional branches:\n - Local stack structure `struct rtnl_mcaddr_dump_filter filter` is initialized with designated initializers, guaranteeing that all other fields (ns_tracker, ifindex) are zeroed.\n - The netlink dump state `cb-\u003ectx` is guaranteed zero-initialized by __netlink_dump_start() via memset().\n\n3. KASAN vs KMSAN:\n - The potential risks introduced by this patch involve RCU lifetime (RCU read locks, dev_get_by_index_rcu), locking (netif_addr_lock_bh), netns tracking reference counts (put_net_track), and skb length limits (-EMSGSIZE / nlmsg_cancel). All of these are monitored and caught by standard debug builds (KASAN, LOCKDEP, refcount checks).\n - There are no uninitialized memory reads or information leaks that would be unique to KMSAN.\n\nTherefore, dedicated KMSAN fuzzing is not needed.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|