AI Trajectory

null

{
  "EnableConfigs": [
    "BONDING"
  ],
  "FocusSymbols": [
    "bond_neigh_init",
    "neigh_parms_lookup_dev"
  ],
  "Reasoning": "The patch modifies the bonding driver's neighbor initialization logic by looking up neighbor parameters of the first slave device and calling its neigh_setup function if available. This is a functional change in reachable network core and bonding driver code.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit e517aeeaca3fe1f64a4a4741564949f96a4978f2\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jul 1 13:58:57 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c\nindex e044fc733b8c03..d2e4dae4e97c23 100644\n--- a/drivers/net/bonding/bond_main.c\n+++ b/drivers/net/bonding/bond_main.c\n@@ -4719,7 +4719,7 @@ static int bond_neigh_init(struct neighbour *n)\n {\n \tstruct bonding *bond = netdev_priv(n-\u003edev);\n \tconst struct net_device_ops *slave_ops;\n-\tstruct neigh_parms parms;\n+\tstruct neigh_parms parms, *p;\n \tstruct slave *slave;\n \tint ret = 0;\n \n@@ -4727,6 +4727,14 @@ static int bond_neigh_init(struct neighbour *n)\n \tslave = bond_first_slave_rcu(bond);\n \tif (!slave)\n \t\tgoto out;\n+\n+\tp = neigh_parms_lookup_dev(n-\u003etbl, slave-\u003edev);\n+\n+\tif (p \u0026\u0026 p-\u003eneigh_setup) {\n+\t\tret = p-\u003eneigh_setup(n);\n+\t\tgoto out;\n+\t}\n+\n \tslave_ops = slave-\u003edev-\u003enetdev_ops;\n \tif (!slave_ops-\u003endo_neigh_setup)\n \t\tgoto out;\ndiff --git a/include/net/neighbour.h b/include/net/neighbour.h\nindex 8860cc2175fc1c..1b3b06eda8865c 100644\n--- a/include/net/neighbour.h\n+++ b/include/net/neighbour.h\n@@ -438,6 +438,8 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,\n \t\t\t  proc_handler *proc_handler);\n void neigh_sysctl_unregister(struct neigh_parms *p);\n \n+struct neigh_parms *neigh_parms_lookup_dev(struct neigh_table *tbl, struct net_device *dev);\n+\n static inline void __neigh_parms_put(struct neigh_parms *parms)\n {\n \trefcount_dec(\u0026parms-\u003erefcnt);\ndiff --git a/net/core/neighbour.c b/net/core/neighbour.c\nindex 1349c0eedb6425..6d32c2668af383 100644\n--- a/net/core/neighbour.c\n+++ b/net/core/neighbour.c\n@@ -1757,6 +1757,14 @@ static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,\n \treturn NULL;\n }\n \n+/* Caller must hold rcu_read_lock()*/\n+\n+struct neigh_parms *neigh_parms_lookup_dev(struct neigh_table *tbl, struct net_device *dev)\n+{\n+\treturn lookup_neigh_parms(tbl, dev_net(dev), dev-\u003eifindex);\n+}\n+EXPORT_SYMBOL(neigh_parms_lookup_dev);\n+\n struct neigh_parms *neigh_parms_alloc(struct net_device *dev,\n \t\t\t\t      struct neigh_table *tbl)\n {\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": [
    "BONDING"
  ],
  "FocusSymbols": [
    "bond_neigh_init",
    "neigh_parms_lookup_dev"
  ],
  "Reasoning": "The patch modifies the bonding driver's neighbor initialization logic by looking up neighbor parameters of the first slave device and calling its neigh_setup function if available. This is a functional change in reachable network core and bonding driver code.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit e517aeeaca3fe1f64a4a4741564949f96a4978f2
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jul 1 13:58:57 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index e044fc733b8c03..d2e4dae4e97c23 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4719,7 +4719,7 @@ static int bond_neigh_init(struct neighbour *n)
 {
 	struct bonding *bond = netdev_priv(n->dev);
 	const struct net_device_ops *slave_ops;
-	struct neigh_parms parms;
+	struct neigh_parms parms, *p;
 	struct slave *slave;
 	int ret = 0;
 
@@ -4727,6 +4727,14 @@ static int bond_neigh_init(struct neighbour *n)
 	slave = bond_first_slave_rcu(bond);
 	if (!slave)
 		goto out;
+
+	p = neigh_parms_lookup_dev(n->tbl, slave->dev);
+
+	if (p && p->neigh_setup) {
+		ret = p->neigh_setup(n);
+		goto out;
+	}
+
 	slave_ops = slave->dev->netdev_ops;
 	if (!slave_ops->ndo_neigh_setup)
 		goto out;
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 8860cc2175fc1c..1b3b06eda8865c 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -438,6 +438,8 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
 			  proc_handler *proc_handler);
 void neigh_sysctl_unregister(struct neigh_parms *p);
 
+struct neigh_parms *neigh_parms_lookup_dev(struct neigh_table *tbl, struct net_device *dev);
+
 static inline void __neigh_parms_put(struct neigh_parms *parms)
 {
 	refcount_dec(&parms->refcnt);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 1349c0eedb6425..6d32c2668af383 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1757,6 +1757,14 @@ static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,
 	return NULL;
 }
 
+/* Caller must hold rcu_read_lock()*/
+
+struct neigh_parms *neigh_parms_lookup_dev(struct neigh_table *tbl, struct net_device *dev)
+{
+	return lookup_neigh_parms(tbl, dev_net(dev), dev->ifindex);
+}
+EXPORT_SYMBOL(neigh_parms_lookup_dev);
+
 struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
 				      struct neigh_table *tbl)
 {

gemini-3.1-pro-preview

null

null

							input: 2462
							output: 19
							thoughts: 137
						

**Analyzing the Bonding Driver Patch**

Okay, so this patch is touching `drivers/net/bonding/bond_main.c` and `net/core/neighbour.c`. Interesting. My initial thought is to figure out the functional change and its impact. The key here seems to be `bond_neigh_init`. It looks like they're adding a call to `neigh_parms_lookup_dev`. From the description, the intent is to grab the `neigh_parms` for the *first* slave device and then, crucially, execute its `neigh_setup` function if it's defined.

This strongly suggests an attempt to propagate neighbour discovery configuration from the slave to the bonded interface. The logic is, if the slave has a specific neighbour setup function, we should honor it for the bond. Makes sense in a lot of scenarios.

Time to dive in. Let's start with a quick code check. I'll fire up `grepper` and get the source for both `bond_neigh_init` and `neigh_parms_lookup_dev` to understand the exact implementation details and potential edge cases. I'll need to confirm that `neigh_parms_lookup_dev` returns what I think it does and that the logic correctly handles cases where `neigh_setup` might be NULL or behave unexpectedly.

{
  "Expression": "bond_neigh_init"
}

{
  "Output": "drivers/net/bonding/bond_main.c=4696=static void bond_set_rx_mode(struct net_device *bond_dev)\n--\ndrivers/net/bonding/bond_main.c-4717-\ndrivers/net/bonding/bond_main.c:4718:static int bond_neigh_init(struct neighbour *n)\ndrivers/net/bonding/bond_main.c-4719-{\n--\ndrivers/net/bonding/bond_main.c=4771=static int bond_neigh_setup(struct net_device *dev,\n--\ndrivers/net/bonding/bond_main.c-4775-\tif (parms-\u003edev == dev)\ndrivers/net/bonding/bond_main.c:4776:\t\tparms-\u003eneigh_setup = bond_neigh_init;\ndrivers/net/bonding/bond_main.c-4777-\n"
}

gemini-3.1-pro-preview

null

null

							input: 3133
							output: 17
							thoughts: 41
						

Okay, let's break this down.

**Initial Thoughts on Bonding Initialization**

Right, so `bond_neigh_init` is the function responsible for initializing the neighbor discovery process for bonding. I see that `parms->neigh_setup` is the trigger, the entry point for this to happen. That makes sense, `parms` likely holds all the relevant bonding configuration parameters. Now, since the code is dealing with bonding, I should look into the `BONDING` configuration settings. I'll need to double-check the Kconfig options related to bonding to fully understand how this initialization is being controlled. I need to make sure I am fully up-to-date with this aspect of the networking code.

{
  "Expression": "config BONDING"
}

{
  "Output": "drivers/net/Kconfig=39=if NET_CORE\ndrivers/net/Kconfig-40-\ndrivers/net/Kconfig:41:config BONDING\ndrivers/net/Kconfig-42-\ttristate \"Bonding driver support\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 3415
							output: 22
							thoughts: 47
						

Okay, let's break this down.

**Configuration for Bonding Initialization and Neighbor Parameter Lookup**

Right, so the central configuration item here is clearly `BONDING`. That's where everything starts. My main concerns are the focus symbols – the ones that are going to drive the initialization of the bonding neighborhood and look up the parameters for each device within that neighborhood. Those symbols are `bond_neigh_init` and `neigh_parms_lookup_dev`, respectively.

Now, my next move is to make sure I haven't missed any other crucial configurations that might be required to ensure everything works smoothly. This initial identification of the key components is important, but there's always a chance I overlooked a dependency or a related setting. Let's make sure we haven't.

{
  "Expression": "neigh_parms_lookup_dev"
}

{
  "Output": "drivers/net/bonding/bond_main.c=4718=static int bond_neigh_init(struct neighbour *n)\n--\ndrivers/net/bonding/bond_main.c-4730-\ndrivers/net/bonding/bond_main.c:4731:\tp = neigh_parms_lookup_dev(n-\u003etbl, slave-\u003edev);\ndrivers/net/bonding/bond_main.c-4732-\n--\ninclude/net/neighbour.h=439=void neigh_sysctl_unregister(struct neigh_parms *p);\ninclude/net/neighbour.h-440-\ninclude/net/neighbour.h:441:struct neigh_parms *neigh_parms_lookup_dev(struct neigh_table *tbl, struct net_device *dev);\ninclude/net/neighbour.h-442-\n--\nnet/core/neighbour.c=1746=static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,\n--\nnet/core/neighbour.c-1761-\nnet/core/neighbour.c:1762:struct neigh_parms *neigh_parms_lookup_dev(struct neigh_table *tbl, struct net_device *dev)\nnet/core/neighbour.c-1763-{\n--\nnet/core/neighbour.c-1765-}\nnet/core/neighbour.c:1766:EXPORT_SYMBOL(neigh_parms_lookup_dev);\nnet/core/neighbour.c-1767-\n"
}

gemini-3.1-pro-preview

null

null

							input: 4035
							output: 24
							thoughts: 101
						

**Fuzzing Target Identification**

Okay, so this patch introduces `neigh_parms_lookup_dev` and makes it accessible to `bond_neigh_init`. This immediately screams "fuzzing target" to me. The interaction between these two functions, especially considering the potential for network-related vulnerabilities, makes it a prime candidate.

The main configuration directive to focus on seems to be `BONDING`. Let's confirm that by checking where `bond_main.c` sits in the kernel source tree. Yep, it seems that it's compiled when `CONFIG_BONDING` is enabled.

My key symbols for analysis will be `bond_neigh_init` and `neigh_parms_lookup_dev`. I need to understand how they interact within the bonding context. This looks like a promising avenue for exploring potential vulnerabilities.

{
  "Expression": "obj-\\$\\(CONFIG_BONDING\\)"
}

{
  "Output": "drivers/net/Makefile-8-#\ndrivers/net/Makefile:9:obj-$(CONFIG_BONDING) += bonding/\ndrivers/net/Makefile-10-obj-$(CONFIG_IPVLAN) += ipvlan/\n--\ndrivers/net/bonding/Makefile-5-\ndrivers/net/bonding/Makefile:6:obj-$(CONFIG_BONDING) += bonding.o\ndrivers/net/bonding/Makefile-7-\n"
}

gemini-3.1-pro-preview

null

null

							input: 4451
							output: 99
							thoughts: 85
						

**Analyzing the Bonding Driver Patch**

Okay, so I've examined this patch, and I'm certain that `CONFIG_BONDING` is the relevant configuration option here. My reasoning is solid. The core of this patch is a functional modification to the bonding driver. Specifically, it alters how the driver initializes neighbors. The patch introduces a search for neighbor parameters of the *first* slave device. If the `neigh_setup` function is present, the driver will call it. This is a clear functional change within the network core, specifically impacting how bonding interfaces behave.

Alright, with that confirmed, I'm ready to proceed. Let's make that set-results call.

{
  "EnableConfigs": [
    "BONDING"
  ],
  "FocusSymbols": [
    "bond_neigh_init",
    "neigh_parms_lookup_dev"
  ],
  "Reasoning": "The patch modifies the bonding driver's neighbor initialization logic by looking up neighbor parameters of the first slave device and calling its neigh_setup function if available. This is a functional change in reachable network core and bonding driver code.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "BONDING"
  ],
  "FocusSymbols": [
    "bond_neigh_init",
    "neigh_parms_lookup_dev"
  ],
  "Reasoning": "The patch modifies the bonding driver's neighbor initialization logic by looking up neighbor parameters of the first slave device and calling its neigh_setup function if available. This is a functional change in reachable network core and bonding driver code.",
  "WorthFuzzing": true
}