| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/18 23:00 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": [
"NF_TABLES"
],
"FocusSymbols": [
"__nft_set_elem_expr_destroy",
"nft_set_elem_expr_destroy",
"nf_tables_set_elem_destroy"
],
"KMSANReasoning": "The patch fixes an issue with the destruction of cloned expressions in `nft_dynset`. By introducing a `cloned` flag, it ensures that cloned expressions are destroyed using `__nft_set_elem_expr_destroy` (which calls `destroy_clone`) rather than `nft_expr_destroy`. This addresses a memory management bug, likely a use-after-free, double-free, or invalid free, which occurs when the wrong destruction path is taken. These types of memory corruption bugs are reliably detected by KASAN. The `struct nft_dynset` is an internal kernel structure and is not copied directly to userspace, so the introduction of the `cloned` bitfield does not pose an uninitialized memory info-leak risk. Therefore, KMSAN is not required.",
"NeedsKMSAN": false,
"Reasoning": "The patch fixes a bug in the destruction of cloned expressions within `nft_dynset` by exposing and utilizing `__nft_set_elem_expr_destroy`. This is a functional change in the core netfilter nf_tables logic that manages set elements and expressions, which is reachable from userspace via netlink and should be fuzzed.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/18 23:00 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 9434240ef39148f3fcc4b58b082dd91bae80057f\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Aug 18 23:00:03 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h\nindex 3be612145c130..9bbf1868ce530 100644\n--- a/include/net/netfilter/nf_tables.h\n+++ b/include/net/netfilter/nf_tables.h\n@@ -874,6 +874,8 @@ int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,\n \t\t\t struct nft_expr *expr_array[]);\n void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\n \t\t\t struct nft_set_elem_expr *elem_expr);\n+void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\n+\t\t\t\t struct nft_expr *expr);\n void nft_set_elem_destroy(const struct nft_set *set,\n \t\t\t const struct nft_elem_priv *elem_priv,\n \t\t\t bool destroy_expr);\ndiff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c\nindex af357f6c5070b..b7ca81d359218 100644\n--- a/net/netfilter/nf_tables_api.c\n+++ b/net/netfilter/nf_tables_api.c\n@@ -6825,8 +6825,8 @@ struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,\n \treturn ERR_PTR(-EINVAL);\n }\n \n-static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\n-\t\t\t\t\tstruct nft_expr *expr)\n+void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\n+\t\t\t\t struct nft_expr *expr)\n {\n \tif (expr-\u003eops-\u003edestroy_clone) {\n \t\texpr-\u003eops-\u003edestroy_clone(ctx, expr);\ndiff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c\nindex ee9d3e7b1ecf1..935a07b47a442 100644\n--- a/net/netfilter/nft_dynset.c\n+++ b/net/netfilter/nft_dynset.c\n@@ -19,7 +19,8 @@ struct nft_dynset {\n \tu8\t\t\t\tsreg_key;\n \tu8\t\t\t\tsreg_data;\n \tbool\t\t\t\tinvert;\n-\tbool\t\t\t\texpr;\n+\tu8\t\t\t\texpr:1,\n+\t\t\t\t\tcloned:1;\n \tu8\t\t\t\tnum_exprs;\n \tu64\t\t\t\ttimeout;\n \tstruct nft_expr\t\t\t*expr_array[NFT_SET_EXPR_MAX];\n@@ -168,6 +169,19 @@ static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {\n \t[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },\n };\n \n+static void nft_dynset_expr_destroy(const struct nft_ctx *ctx,\n+\t\t\t\t struct nft_dynset *priv)\n+{\n+\tint i;\n+\n+\tfor (i = 0; i \u003c priv-\u003enum_exprs; i++) {\n+\t\tif (priv-\u003ecloned)\n+\t\t\t__nft_set_elem_expr_destroy(ctx, priv-\u003eexpr_array[i]);\n+\t\telse\n+\t\t\tnft_expr_destroy(ctx, priv-\u003eexpr_array[i]);\n+\t}\n+}\n+\n static int nft_dynset_init(const struct nft_ctx *ctx,\n \t\t\t const struct nft_expr *expr,\n \t\t\t const struct nlattr * const tb[])\n@@ -312,6 +326,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,\n \t\t\treturn err;\n \n \t\tpriv-\u003enum_exprs = set-\u003enum_exprs;\n+\t\tpriv-\u003ecloned = true;\n \t}\n \n \tnft_set_ext_prepare(\u0026priv-\u003etmpl);\n@@ -339,8 +354,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,\n \treturn 0;\n \n err_expr_free:\n-\tfor (i = 0; i \u003c priv-\u003enum_exprs; i++)\n-\t\tnft_expr_destroy(ctx, priv-\u003eexpr_array[i]);\n+\tnft_dynset_expr_destroy(ctx, priv);\n \treturn err;\n }\n \n@@ -365,11 +379,8 @@ static void nft_dynset_destroy(const struct nft_ctx *ctx,\n \t\t\t const struct nft_expr *expr)\n {\n \tstruct nft_dynset *priv = nft_expr_priv(expr);\n-\tint i;\n-\n-\tfor (i = 0; i \u003c priv-\u003enum_exprs; i++)\n-\t\tnft_expr_destroy(ctx, priv-\u003eexpr_array[i]);\n \n+\tnft_dynset_expr_destroy(ctx, priv);\n \tnf_tables_destroy_set(ctx, priv-\u003eset);\n }\n \n"
} |
| 2/1 | 2026/08/18 23:00 | agent | patch-evaluator |
1mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"NF_TABLES"
],
"FocusSymbols": [
"__nft_set_elem_expr_destroy",
"nft_set_elem_expr_destroy",
"nf_tables_set_elem_destroy"
],
"Reasoning": "The patch fixes a bug in the destruction of cloned expressions within `nft_dynset` by exposing and utilizing `__nft_set_elem_expr_destroy`. This is a functional change in the core netfilter nf_tables logic that manages set elements and expressions, which is reachable from userspace via netlink and should be fuzzed.",
"WorthFuzzing": true
}Instruction: 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). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. 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. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 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. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. 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. Prompt: For your convenience, here is the diff of the changes:
commit 9434240ef39148f3fcc4b58b082dd91bae80057f
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Aug 18 23:00:03 2026 +0000
syz-cluster: applied patch under review
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 3be612145c130..9bbf1868ce530 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -874,6 +874,8 @@ int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_expr *expr_array[]);
void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
struct nft_set_elem_expr *elem_expr);
+void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
+ struct nft_expr *expr);
void nft_set_elem_destroy(const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool destroy_expr);
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index af357f6c5070b..b7ca81d359218 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6825,8 +6825,8 @@ struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
return ERR_PTR(-EINVAL);
}
-static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
- struct nft_expr *expr)
+void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
+ struct nft_expr *expr)
{
if (expr->ops->destroy_clone) {
expr->ops->destroy_clone(ctx, expr);
diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index ee9d3e7b1ecf1..935a07b47a442 100644
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -19,7 +19,8 @@ struct nft_dynset {
u8 sreg_key;
u8 sreg_data;
bool invert;
- bool expr;
+ u8 expr:1,
+ cloned:1;
u8 num_exprs;
u64 timeout;
struct nft_expr *expr_array[NFT_SET_EXPR_MAX];
@@ -168,6 +169,19 @@ static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
};
+static void nft_dynset_expr_destroy(const struct nft_ctx *ctx,
+ struct nft_dynset *priv)
+{
+ int i;
+
+ for (i = 0; i < priv->num_exprs; i++) {
+ if (priv->cloned)
+ __nft_set_elem_expr_destroy(ctx, priv->expr_array[i]);
+ else
+ nft_expr_destroy(ctx, priv->expr_array[i]);
+ }
+}
+
static int nft_dynset_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
@@ -312,6 +326,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
return err;
priv->num_exprs = set->num_exprs;
+ priv->cloned = true;
}
nft_set_ext_prepare(&priv->tmpl);
@@ -339,8 +354,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
return 0;
err_expr_free:
- for (i = 0; i < priv->num_exprs; i++)
- nft_expr_destroy(ctx, priv->expr_array[i]);
+ nft_dynset_expr_destroy(ctx, priv);
return err;
}
@@ -365,11 +379,8 @@ static void nft_dynset_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
struct nft_dynset *priv = nft_expr_priv(expr);
- int i;
-
- for (i = 0; i < priv->num_exprs; i++)
- nft_expr_destroy(ctx, priv->expr_array[i]);
+ nft_dynset_expr_destroy(ctx, priv);
nf_tables_destroy_set(ctx, priv->set);
}
|
| 3/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3102 output: 31 thoughts: 149 Thoughts: **Analyzing a Netfilter Patch** Okay, so I've got this patch here that's making changes in `net/netfilter/nf_tables_api.c` and `net/netfilter/nft_dynset.c`. Seems like the core of the change is exposing `__nft_set_elem_expr_destroy` and then utilizing it within `nft_dynset_expr_destroy` for correct destruction of cloned expressions in the `nft_dynset` module. This is definitely a functional modification within the Netfilter ecosystem – always good to see those improvements. I see it impacts `nft_dynset_init` and `nft_dynset_destroy`, which are pretty key. Given this level of core module change, I'm thinking we should definitely mark it as `WorthFuzzing=true`. Gotta make sure we cover all bases. Now, before I dive deeper, I want to confirm the configuration aspects for nf_tables and nft_dynset. Let me quickly use `git grep` to track down the relevant Kconfig options and see what's enabled. That should give me a better understanding of the wider context and potential impact. |
| 4/2 | 2026/08/18 23:00 | tool | grepper |
0mError:no matches Args: {
"Expression": "nft_dynset",
"PathPrefix": "net/netfilter/Kconfig"
}Results: {
"error": "no matches"
} |
| 5/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3543 output: 30 thoughts: 22 Thoughts: **Finding the Dynamic NFT Set Code** Okay, let's get down to brass tacks. I need to locate the source code for the dynamic NFT set functionality. My immediate hunch is that it's likely nestled somewhere within the netfilter subsystem, specifically related to the NFTables implementation. Makes sense, right? Dynamic sets are a core feature of that framework. So, my starting point will be to search the `net/netfilter/Makefile` file. That's usually the go-to place for build instructions and, crucially, for listing the source files involved in that section of the kernel. Hopefully, `nft_dynset.c` will be directly listed, or at least a related entry will give me a clear lead. Time to get digging! |
| 6/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nft_dynset",
"PathPrefix": "net/netfilter/Makefile"
}Results: {
"Output": "net/netfilter/Makefile=87=nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\n--\nnet/netfilter/Makefile-89-\t\t nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \\\nnet/netfilter/Makefile:90:\t\t nft_dynset.o nft_meta.o nft_rt.o nft_exthdr.o nft_last.o \\\nnet/netfilter/Makefile-91-\t\t nft_counter.o nft_objref.o nft_inner.o \\\n"
} |
| 7/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3913 output: 31 thoughts: 25 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Investigating the nf_tables Dependency** Alright, so this snippet flags itself as part of `nf_tables-objs`. Naturally, my first question is: what's the actual configuration option that brings `nf_tables` into play? I need to understand the *why* behind this object's presence. Knowing that config option is key; it'll point me directly to the relevant build settings or module dependencies. Understanding this is critical for diagnosing any issues or customizing the system. It's time to dig into the configuration. |
| 8/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nf_tables-objs",
"PathPrefix": "net/netfilter/Makefile"
}Results: {
"Output": "net/netfilter/Makefile=84=obj-$(CONFIG_NF_DUP_NETDEV)\t+= nf_dup_netdev.o\n--\nnet/netfilter/Makefile-86-# nf_tables\nnet/netfilter/Makefile:87:nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\nnet/netfilter/Makefile-88-\t\t nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \\\n--\nnet/netfilter/Makefile=97=ifndef CONFIG_UML\nnet/netfilter/Makefile:98:nf_tables-objs += nft_set_pipapo_avx2.o\nnet/netfilter/Makefile-99-endif\n--\nnet/netfilter/Makefile=103=ifdef CONFIG_MITIGATION_RETPOLINE\nnet/netfilter/Makefile:104:nf_tables-objs += nft_ct_fast.o\nnet/netfilter/Makefile-105-endif\n"
} |
| 9/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4359 output: 29 thoughts: 16 Thoughts: Here's my attempt at summarizing that thought process, tailored for an expert audience: **NF_TABLES Build Configuration Conundrum** Okay, hold on a second. I'm looking at this build process, and I've hit a snag. What exactly is the purpose and origin of that `obj-$(CONFIG_...)` line for `nf_tables`? I know the general principles of the build system, but I need to fully understand this specific construct in relation to the kernel's netfilter subsystem and tables. Is this how we manage its object files, or is there more to it? I should probably refresh myself on Kbuild syntax so I don't miss anything. I need to be sure I'm following the dependency tree correctly, especially when considering the implications of conditional compilation based on other configuration options. Understanding how it links the various `CONFIG_` options to the module's object file is key, and I don't want to make any incorrect assumptions here. |
| 10/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nf_tables",
"PathPrefix": "net/netfilter/Makefile"
}Results: {
"Output": "net/netfilter/Makefile=84=obj-$(CONFIG_NF_DUP_NETDEV)\t+= nf_dup_netdev.o\nnet/netfilter/Makefile-85-\nnet/netfilter/Makefile:86:# nf_tables\nnet/netfilter/Makefile:87:nf_tables-objs := nf_tables_core.o nf_tables_api.o nft_chain_filter.o \\\nnet/netfilter/Makefile:88:\t\t nf_tables_trace.o nft_immediate.o nft_cmp.o nft_range.o \\\nnet/netfilter/Makefile-89-\t\t nft_bitwise.o nft_byteorder.o nft_payload.o nft_lookup.o \\\n--\nnet/netfilter/Makefile-91-\t\t nft_counter.o nft_objref.o nft_inner.o \\\nnet/netfilter/Makefile:92:\t\t nft_chain_route.o nf_tables_offload.o \\\nnet/netfilter/Makefile-93-\t\t nft_set_hash.o nft_set_bitmap.o nft_set_rbtree.o \\\n--\nnet/netfilter/Makefile=97=ifndef CONFIG_UML\nnet/netfilter/Makefile:98:nf_tables-objs += nft_set_pipapo_avx2.o\nnet/netfilter/Makefile-99-endif\n--\nnet/netfilter/Makefile=103=ifdef CONFIG_MITIGATION_RETPOLINE\nnet/netfilter/Makefile:104:nf_tables-objs += nft_ct_fast.o\nnet/netfilter/Makefile-105-endif\nnet/netfilter/Makefile=106=endif\nnet/netfilter/Makefile-107-\nnet/netfilter/Makefile:108:obj-$(CONFIG_NF_TABLES)\t\t+= nf_tables.o\nnet/netfilter/Makefile-109-obj-$(CONFIG_NFT_COMPAT)\t+= nft_compat.o\n--\nnet/netfilter/Makefile=135=obj-$(CONFIG_NFT_NAT)\t\t+= nft_chain_nat.o\nnet/netfilter/Makefile-136-\nnet/netfilter/Makefile:137:# nf_tables netdev\nnet/netfilter/Makefile-138-obj-$(CONFIG_NFT_DUP_NETDEV)\t+= nft_dup_netdev.o\n"
} |
| 11/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5187 output: 32 thoughts: 33 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **NF_TABLES Investigation** Alright, the initial clue points directly to `CONFIG_NF_TABLES`. This almost certainly means we're dealing with the Netfilter connection tracking and state management subsystem, which has always been something I'm intimately familiar with. Time to delve into the Kconfig for `NF_TABLES`. I need to understand the implications of this configuration option within the broader Netfilter framework. I'll need to see its dependencies, any conflicting options, the potential implications of enabling or disabling it, and whether there are any conditional compilation directives that I should be aware of. I'll need to quickly assess how this relates to any recent changes in the kernel source or community discussions. And that's exactly where I'll be going next. |
| 12/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "config NF_TABLES",
"PathPrefix": "net/netfilter/Kconfig"
}Results: {
"Output": "net/netfilter/Kconfig=453=endif # NF_CONNTRACK\nnet/netfilter/Kconfig-454-\nnet/netfilter/Kconfig:455:config NF_TABLES\nnet/netfilter/Kconfig-456-\tselect NETFILTER_NETLINK\n--\nnet/netfilter/Kconfig=471=if NF_TABLES\nnet/netfilter/Kconfig:472:config NF_TABLES_INET\nnet/netfilter/Kconfig-473-\tdepends on IPV6\n--\nnet/netfilter/Kconfig-479-\nnet/netfilter/Kconfig:480:config NF_TABLES_NETDEV\nnet/netfilter/Kconfig-481-\tbool \"Netfilter nf_tables netdev tables support\"\n"
} |
| 13/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5632 output: 37 thoughts: 118 Thoughts: **Analyzing the Dynamic Set Configuration** Okay, so the current configuration is using `NF_TABLES`, which is good. Now, the key question is whether `nft_dynset` requires any *additional* configurations. I'm pretty sure it doesn't; since `nft_dynset` is compiled as a part of `nf_tables`, we should be set. That's one less thing to worry about. Now, let's zero in on the specific functions impacted by the patch. From a quick scan, it looks like `nft_dynset_init` and `nft_dynset_destroy` are the primary targets of the modifications. Also, it touches `__nft_set_elem_expr_destroy` within `nf_tables_api.c`, so I'll need to check that one. Alright, time to get into the nitty-gritty. I'll take a look at the signatures for `nft_dynset_init` and `nft_dynset_destroy` to understand the data structures and parameters they're dealing with. Knowing the function signatures is essential to grasping the intent and impact of the changes. |
| 14/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nft_dynset_init",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"Output": "net/netfilter/nft_dynset.c=172=static void nft_dynset_expr_destroy(const struct nft_ctx *ctx,\n--\nnet/netfilter/nft_dynset.c-184-\nnet/netfilter/nft_dynset.c:185:static int nft_dynset_init(const struct nft_ctx *ctx,\nnet/netfilter/nft_dynset.c-186-\t\t\t const struct nft_expr *expr,\n--\nnet/netfilter/nft_dynset.c=435=static const struct nft_expr_ops nft_dynset_ops = {\n--\nnet/netfilter/nft_dynset.c-438-\t.eval\t\t= nft_dynset_eval,\nnet/netfilter/nft_dynset.c:439:\t.init\t\t= nft_dynset_init,\nnet/netfilter/nft_dynset.c-440-\t.destroy\t= nft_dynset_destroy,\n"
} |
| 15/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6285 output: 38 thoughts: 196 Thoughts: **Analyzing the Dynamic Set Initialization and Destruction** Okay, so I'm looking at these functions, `nft_dynset_ops.init` and `nft_dynset_ops.destroy`. They're static, which is something I immediately flag, given the guidelines about preferring non-static entrypoints. The documentation clearly states to favor non-static, non-inlined API entrypoints over static helper functions, because of the distinct symbol addresses. But, wait a minute, `nft_dynset_init` and `nft_dynset_destroy` *are* assigned to function pointers within `nft_expr_ops`. That means they shouldn't be inlined. They should have distinct addresses, contradicting the initial worry. That's a point to make, but let's check further. The question then becomes, are there non-static entrypoints available, which call them? Let's trace this. Looks like `nf_tables_newexpr` in `nf_tables_api.c` calls `expr->ops->init`. And on destruction, `nf_tables_expr_destroy` calls `expr->ops->destroy`. I need to check `nf_tables_api.c` more closely to confirm this is what's happening and that these are, indeed, the intended entrypoints. Let's see... |
| 16/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nf_tables_newexpr",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=3580=int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,\n--\nnet/netfilter/nf_tables_api.c-3628-\nnet/netfilter/nf_tables_api.c:3629:static int nf_tables_newexpr(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-3630-\t\t\t const struct nft_expr_info *expr_info,\n--\nnet/netfilter/nf_tables_api.c=3659=static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-3679-\nnet/netfilter/nf_tables_api.c:3680:\terr = nf_tables_newexpr(ctx, \u0026expr_info, expr);\nnet/netfilter/nf_tables_api.c-3681-\tif (err \u003c 0)\n--\nnet/netfilter/nf_tables_api.c=4310=static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,\n--\nnet/netfilter/nf_tables_api.c-4455-\tfor (i = 0; i \u003c n; i++) {\nnet/netfilter/nf_tables_api.c:4456:\t\terr = nf_tables_newexpr(\u0026ctx, \u0026expr_info[i], expr);\nnet/netfilter/nf_tables_api.c-4457-\t\tif (err \u003c 0) {\n"
} |
| 17/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7227 output: 38 thoughts: 53 Thoughts: Okay, let's see... **Checking for Potential Static Function Issues in `nf_tables_api.c`** Alright, so I'm thinking about these static functions we've been seeing. I know `nft_expr_init` is static; we need to make a note of that. And then, there's `nf_tables_newrule` – that's another one. Let me just pause to verify them. So, to get a better understanding of what's going on, it seems like the most logical next step is to examine the non-static functions within `nf_tables_api.c`. That should give me a good overview of the file's public interface and whether any of these static functions are being used in a way that might be problematic. |
| 18/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "^int nf_tables_",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=285=static void nft_chain_trans_bind(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-290-\nnet/netfilter/nf_tables_api.c:291:int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)\nnet/netfilter/nf_tables_api.c-292-{\n--\nnet/netfilter/nf_tables_api.c=5854=static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-5875-\nnet/netfilter/nf_tables_api.c:5876:int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,\nnet/netfilter/nf_tables_api.c-5877-\t\t struct nft_set_binding *binding)\n"
} |
| 19/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7749 output: 38 thoughts: 14 Thoughts: Okay, here's my attempt at summarizing those thoughts from an expert's perspective, using the first person and aiming for a fulsome rendering: **My Line of Inquiry: Identifying Exported and Non-Static Functions** Right, so I need to get to the bottom of this. My immediate thought is, "Let's start by zeroing in on functions that are either *exported* or, more broadly, *non-static*." I know that's the key starting point. Exported functions are the ones visible to and callable from outside the current module or library; they represent the API, the public interface. Non-static functions, of course, have external linkage in this context as well. We need to distinguish between these functions and anything internal. Thinking about the architecture, identifying those will be the crucial first step for this task. I know there will be a handful of good ways to find this information, let's start digging. |
| 20/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "^void nf_tables_",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=291=int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)\n--\nnet/netfilter/nf_tables_api.c-310-\nnet/netfilter/nf_tables_api.c:311:void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)\nnet/netfilter/nf_tables_api.c-312-{\n--\nnet/netfilter/nf_tables_api.c=2344=static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)\n--\nnet/netfilter/nf_tables_api.c-2357-\nnet/netfilter/nf_tables_api.c:2358:void nf_tables_chain_destroy(struct nft_chain *chain)\nnet/netfilter/nf_tables_api.c-2359-{\n--\nnet/netfilter/nf_tables_api.c=4075=static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,\n--\nnet/netfilter/nf_tables_api.c-4116-\nnet/netfilter/nf_tables_api.c:4117:void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)\nnet/netfilter/nf_tables_api.c-4118-{\n--\nnet/netfilter/nf_tables_api.c=5969=static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)\n--\nnet/netfilter/nf_tables_api.c-5982-\nnet/netfilter/nf_tables_api.c:5983:void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)\nnet/netfilter/nf_tables_api.c-5984-{\n--\nnet/netfilter/nf_tables_api.c-5994-\nnet/netfilter/nf_tables_api.c:5995:void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,\nnet/netfilter/nf_tables_api.c-5996-\t\t\t struct nft_set_binding *binding,\n--\nnet/netfilter/nf_tables_api.c-6033-\nnet/netfilter/nf_tables_api.c:6034:void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)\nnet/netfilter/nf_tables_api.c-6035-{\n--\nnet/netfilter/nf_tables_api.c=6882=static void nft_trans_set_elem_destroy(const struct nft_ctx *ctx, struct nft_trans_elem *te)\n--\nnet/netfilter/nf_tables_api.c-6897- */\nnet/netfilter/nf_tables_api.c:6898:void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-6899-\t\t\t\tconst struct nft_set *set,\n--\nnet/netfilter/nf_tables_api.c=8821=EXPORT_SYMBOL_GPL(nft_flowtable_lookup);\nnet/netfilter/nf_tables_api.c-8822-\nnet/netfilter/nf_tables_api.c:8823:void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-8824-\t\t\t\t struct nft_flowtable *flowtable,\n--\nnet/netfilter/nf_tables_api.c=10259=static void nf_tables_trans_destroy_work(struct work_struct *w)\n--\nnet/netfilter/nf_tables_api.c-10279-\nnet/netfilter/nf_tables_api.c:10280:void nf_tables_trans_destroy_flush_work(struct net *net)\nnet/netfilter/nf_tables_api.c-10281-{\n"
} |
| 21/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9067 output: 42 thoughts: 65 Thoughts: Here's my analysis of this code snippet: **Deconstructing Netfilter Set Element Destruction** Okay, so I see that `nf_tables_destroy_set` and `nf_tables_set_elem_destroy` are exported symbols or non-static, meaning they're accessible from outside their immediate scope. This is important because it means they're likely part of a public API or are used by other kernel modules. But hang on a minute... I'm also noticing that `__nft_set_elem_expr_destroy` has been *modified* and is now exposed. That's a key detail! Anytime an internal function gets changed to be public, it warrants immediate investigation. We need to figure out *why* and what the implications are. Let's delve into that specific function, `__nft_set_elem_expr_destroy`. That's where the real action likely is. This could be a critical point for understanding a recent change in the netfilter subsystem. |
| 22/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "__nft_set_elem_expr_destroy",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=6780=struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,\n--\nnet/netfilter/nf_tables_api.c-6827-\nnet/netfilter/nf_tables_api.c:6828:void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-6829-\t\t\t\t struct nft_expr *expr)\n--\nnet/netfilter/nf_tables_api.c=6839=void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-6845-\tnft_setelem_expr_foreach(expr, elem_expr, size)\nnet/netfilter/nf_tables_api.c:6846:\t\t__nft_set_elem_expr_destroy(ctx, expr);\nnet/netfilter/nf_tables_api.c-6847-}\n"
} |
| 23/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9657 output: 38 thoughts: 107 Thoughts: **Analyzing Netfilter Table Set Element Destruction and Netlink Message Entry Points** Okay, so I'm looking at these Netfilter table functions and I've noticed something. `nft_set_elem_expr_destroy`, `__nft_set_elem_expr_destroy`, and `nft_set_elem_destroy` are all *non-static*. This is interesting, but I need to understand the bigger picture. I need to be able to follow the data structures. The real question, though, is how are these called? What are the entry points for netlink messages that trigger this? Right, I need to check those. Ah, yes, here we go: `nf_tables_newset`, `nf_tables_delset`, `nf_tables_newsetelem`, and `nf_tables_delsetelem`. These are probably the key functions for managing sets. I should make sure of this, I need to check if those entry points are static or not. This will provide a good picture of the overall architecture. |
| 24/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nf_tables_newset",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=5422=static u32 nft_set_kernel_size(const struct nft_set_ops *ops,\n--\nnet/netfilter/nf_tables_api.c-5430-\nnet/netfilter/nf_tables_api.c:5431:static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,\nnet/netfilter/nf_tables_api.c-5432-\t\t\t const struct nlattr * const nla[])\n--\nnet/netfilter/nf_tables_api.c=7248=static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,\n--\nnet/netfilter/nf_tables_api.c-7661-\nnet/netfilter/nf_tables_api.c:7662:static int nf_tables_newsetelem(struct sk_buff *skb,\nnet/netfilter/nf_tables_api.c-7663-\t\t\t\tconst struct nfnl_info *info,\n--\nnet/netfilter/nf_tables_api.c=9923=static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {\n--\nnet/netfilter/nf_tables_api.c-10002-\t[NFT_MSG_NEWSET] = {\nnet/netfilter/nf_tables_api.c:10003:\t\t.call\t\t= nf_tables_newset,\nnet/netfilter/nf_tables_api.c-10004-\t\t.type\t\t= NFNL_CB_BATCH,\n--\nnet/netfilter/nf_tables_api.c-10026-\t[NFT_MSG_NEWSETELEM] = {\nnet/netfilter/nf_tables_api.c:10027:\t\t.call\t\t= nf_tables_newsetelem,\nnet/netfilter/nf_tables_api.c-10028-\t\t.type\t\t= NFNL_CB_BATCH,\n"
} |
| 25/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10547 output: 35 thoughts: 192 Thoughts: **Analyzing Static vs. Non-Static Functions in Netfilter Tables** Okay, so I'm digging into this Netfilter Tables code, trying to understand how things are structured. My initial concern was about how some functions related to dynamic sets are handled. I see these functions like the ones registered in `nf_tables_cb` and those in `nft_dynset_ops`. They seem static, which can complicate things down the line. But I remember that note about preferring non-static, non-inlined API entrypoints! That's key. It's a reminder that we want those distinct symbol addresses for better clarity and maintainability. So, I need to check which functions are *not* static, and therefore probably more suitable for what we want. I see that `__nft_set_elem_expr_destroy`, `nft_set_elem_expr_destroy`, `nft_set_elem_destroy`, `nf_tables_destroy_set`, and `nf_tables_set_elem_destroy` are all non-static. Good. That's a good starting point. I should probably now shift my focus to `nft_dynset.c` to see if there are any non-static functions there that might be helpful. I'll need to double-check their role and see if they can be incorporated. |
| 26/2 | 2026/08/18 23:00 | tool | grepper |
0mError:no matches Args: {
"Expression": "^int nft_",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"error": "no matches"
} |
| 27/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11070 output: 35 thoughts: 19 Thoughts: Here's a summary of my thought process: **Reviewing `nft_dynset.c` for Public Functions** Okay, time to dive in. My immediate focus is on the `nft_dynset.c` file. Given my expertise, I need to quickly identify any functions within this source file that aren't declared as `static`. The presence of non-static functions is key – they represent potential entry points or publicly accessible interfaces related to dynamic sets within the Netfilter framework. I need to understand what those interfaces are, how they are used, and whether they are being used properly. So, I’m mentally scanning the code for those key indicators. This will give me a solid starting point for deeper analysis. |
| 28/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "^void nft_",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"Output": "net/netfilter/nft_dynset.c=56=struct nft_elem_priv *nft_dynset_new(struct nft_set *set,\n--\nnet/netfilter/nft_dynset.c-89-\nnet/netfilter/nft_dynset.c:90:void nft_dynset_eval(const struct nft_expr *expr,\nnet/netfilter/nft_dynset.c-91-\t\t struct nft_regs *regs, const struct nft_pktinfo *pkt)\n"
} |
| 29/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11409 output: 37 thoughts: 29 Thoughts: Here's my thought process, as requested: **Debugging `nft_dynset_eval`'s Static Nature** Okay, so I'm looking at `nft_dynset_eval` and trying to determine if it's declared static or not. My initial thought was that it *wasn't* static. I'm trying to remember why, and I think I started with a quick grep search. But hold on, the grep search gave me `void nft_dynset_eval`. It's not a definitive indicator. I need to make sure I understand why this is a factor. Let me go back and re-examine the code... |
| 30/2 | 2026/08/18 23:00 | tool | grepper |
0mArgs:{
"Expression": "nft_dynset_eval",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"Output": "net/netfilter/nft_dynset.c=56=struct nft_elem_priv *nft_dynset_new(struct nft_set *set,\n--\nnet/netfilter/nft_dynset.c-89-\nnet/netfilter/nft_dynset.c:90:void nft_dynset_eval(const struct nft_expr *expr,\nnet/netfilter/nft_dynset.c-91-\t\t struct nft_regs *regs, const struct nft_pktinfo *pkt)\n--\nnet/netfilter/nft_dynset.c=435=static const struct nft_expr_ops nft_dynset_ops = {\n--\nnet/netfilter/nft_dynset.c-437-\t.size\t\t= NFT_EXPR_SIZE(sizeof(struct nft_dynset)),\nnet/netfilter/nft_dynset.c:438:\t.eval\t\t= nft_dynset_eval,\nnet/netfilter/nft_dynset.c-439-\t.init\t\t= nft_dynset_init,\n"
} |
| 31/2 | 2026/08/18 23:00 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11880 output: 37 thoughts: 37 Thoughts: Okay, here's my interpretation of those thoughts, presented as my own mental process, given my expertise: **Diving into the NFTables Dynamic Set Implementation** Right, so I'm looking at this `nft_dynset_eval` function. The first thing that jumps out is that it's *not* declared as `static`. That's an important detail. It means this function is likely designed to be called from outside the specific source file it's defined in, likely by the core NFTables framework or other modules interacting with it. I need to keep that in mind when tracing the data flow and how it fits into the broader picture. Now, my mind shifts to `nft_dynset_new`. This is where these dynamic sets get created, right? And I see that it returns a `struct nft_elem_priv *`. Okay, so that's the private data element associated with a set element within this dynamic set. This suggests that the dynamic set implementation probably relies on storing some per-element private data to manage its dynamic behavior. That `nft_elem_priv` struct likely contains the internal state needed for dynamic evaluation, such as pointers, flags, or cached values. I wonder if this private data structure is related to a particular element of a set, or related to the set itself. I'll need to dig deeper into what the contents of `nft_elem_priv` actually are to fully grasp the memory allocation and purpose, but this already gives me a good start. I'll need to see how `nft_dynset_new` initializes this private data, and how `nft_dynset_eval` then uses it. |
| 32/2 | 2026/08/18 23:01 | tool | grepper |
0mArgs:{
"Expression": "nft_dynset_new",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"Output": "net/netfilter/nft_dynset.c=30=static int nft_dynset_expr_setup(const struct nft_dynset *priv,\n--\nnet/netfilter/nft_dynset.c-55-\nnet/netfilter/nft_dynset.c:56:struct nft_elem_priv *nft_dynset_new(struct nft_set *set,\nnet/netfilter/nft_dynset.c-57-\t\t\t\t const struct nft_expr *expr,\n"
} |
| 33/2 | 2026/08/18 23:01 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12433 output: 34 thoughts: 41 Thoughts: Here's my thought process, as if I were analyzing this code: **Uncovering a Potential Code Anomalie** Okay, hold on a second. `nft_dynset_new` is defined as non-static, but it's not actually exported as a symbol. That immediately raises a flag for me. It's unusual to have a non-static function with that scope. It suggests either an oversight during refactoring or potentially an internal API that's being misused. I need to get to the bottom of this. First things first, I'm going to quickly scan the `nft_dynset.c` file itself. I need to confirm there's no glaring reason it needs to be non-static or if the code is using the function within the same .c file, preventing the need for an external export. Let's see if there are any other exported symbols that give me context. This should only take a few seconds to run some basic commands. I'll get to the bottom of this. |
| 34/2 | 2026/08/18 23:01 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"error": "no matches"
} |
| 35/2 | 2026/08/18 23:01 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12737 output: 42 thoughts: 115 Thoughts: **Diving into the NFTables Dynamic Set Initialization** Okay, so I'm digging into how dynamic sets are initialized within NFTables. The first thing that jumps out is `nft_dynset_init` in `nft_dynset.c`. It's static, which is what I'd expect for an internal initialization function. My next logical step is to see if there's any non-static function within `nft_dynset.c` that's responsible for the initialization or destruction process. Nothing immediately screams out, which isn't entirely surprising. However, I have to be thorough, so I'll check `__nft_set_elem_expr_destroy`. That one is non-static, so it's a potential point of interest. The key question is whether or not that function is actually exported. Nope, it's not exported. Alright, even if it's not exposed externally, I still need to understand its role. It's time to follow the trail and check `nf_tables_api.c` to see how (or if) it gets used. |
| 36/2 | 2026/08/18 23:01 | tool | grepper |
0mArgs:{
"Expression": "__nft_set_elem_expr_destroy",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=6780=struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,\n--\nnet/netfilter/nf_tables_api.c-6827-\nnet/netfilter/nf_tables_api.c:6828:void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-6829-\t\t\t\t struct nft_expr *expr)\n--\nnet/netfilter/nf_tables_api.c=6839=void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-6845-\tnft_setelem_expr_foreach(expr, elem_expr, size)\nnet/netfilter/nf_tables_api.c:6846:\t\t__nft_set_elem_expr_destroy(ctx, expr);\nnet/netfilter/nf_tables_api.c-6847-}\n"
} |
| 37/2 | 2026/08/18 23:01 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13401 output: 31 thoughts: 387 Thoughts: **My Fuzzing Strategy for `nft_dynset`** Okay, let's get down to brass tacks. I need to focus my fuzzing efforts on the `nft_dynset` functionality, specifically targeting `nft_dynset_init` and `nft_dynset_destroy`. Since these are static functions, the question is whether syzkaller can reach them. Normally, static functions might be inlined, but because they're assigned to function pointers, that's less likely. However, syzkaller might struggle to target them directly by name. I need to keep that in mind. Given this constraint, I'll prioritize functions that are likely to be accessible by name. I'll include `__nft_set_elem_expr_destroy` and `nft_set_elem_expr_destroy` in my initial list. While the netlink entry points like `nf_tables_newset` and `nf_tables_delset` are also relevant, they are static, making them less ideal targets. I need to find the *non-static* entry points for netfilter netlink - are there any? Perhaps `nfnetlink_rcv_batch` in `nfnetlink.c` could be a starting point, but I need to make sure I'm going in the right direction. For now, I'll stick with listing `__nft_set_elem_expr_destroy` as my primary target to begin. Next, I need to make sure I'm not missing any critical configuration dependencies. I know `NF_TABLES` is essential, but is there anything specific to `nft_dynset`? I've already checked `net/netfilter/Makefile`, and it looks like `nft_dynset` is built under `CONFIG_NF_TABLES`. I should double-check for any other dependencies for completeness, but I think I've covered the basics. |
| 38/2 | 2026/08/18 23:01 | tool | grepper |
0mError:no matches Args: {
"Expression": "nft_dynset",
"PathPrefix": "net/netfilter/Kconfig"
}Results: {
"error": "no matches"
} |
| 39/2 | 2026/08/18 23:01 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14240 output: 37 thoughts: 127 Thoughts: **Analyzing the Dynamic Set Patch** Okay, so the initial assumption was incorrect, it doesn't align as expected. Looking at the configurations, it's definitely `NF_TABLES`. I need to zero in on the key symbols, which are `__nft_set_elem_expr_destroy` and `nft_set_elem_expr_destroy`. Now, there's a quick realization: `nft_dynset_eval` is non-static, but this patch seems to be specifically about initialization and destruction, not evaluation. That's a key distinction. Now, let me see if `nft_dynset_new` is also non-static, because if it relates to init, I'll need to check it, too. Yes, it appears to be. Okay, let's add `nft_dynset_new` to the list. Just to be completely thorough, let me quickly confirm that `nft_dynset_new` is actually defined within `nft_dynset.c`. Good, I'll keep that in mind. |
| 40/2 | 2026/08/18 23:01 | tool | grepper |
0mArgs:{
"Expression": "nft_dynset_new",
"PathPrefix": "net/netfilter/nft_dynset.c"
}Results: {
"Output": "net/netfilter/nft_dynset.c=30=static int nft_dynset_expr_setup(const struct nft_dynset *priv,\n--\nnet/netfilter/nft_dynset.c-55-\nnet/netfilter/nft_dynset.c:56:struct nft_elem_priv *nft_dynset_new(struct nft_set *set,\nnet/netfilter/nft_dynset.c-57-\t\t\t\t const struct nft_expr *expr,\n"
} |
| 41/2 | 2026/08/18 23:01 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14757 output: 41 thoughts: 31 Thoughts: Okay, here's my summary, presented as a stream of thought: **Checking the `nft_set_elem_expr_destroy` Implementation** Yes, that's correct. I'm pretty sure that's the area we need to focus on. Now, let's dive into the code. Specifically, I'll need to check the `nf_tables_api.c` file and, more precisely, look at the `nft_set_elem_expr_destroy` function. I need to understand exactly how that function is implemented; what's it doing with memory, and where potential issues might be lurking. Time to get my hands dirty. |
| 42/2 | 2026/08/18 23:01 | tool | grepper |
0mArgs:{
"Expression": "nft_set_elem_expr_destroy",
"PathPrefix": "net/netfilter/nf_tables_api.c"
}Results: {
"Output": "net/netfilter/nf_tables_api.c=6780=struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,\n--\nnet/netfilter/nf_tables_api.c-6827-\nnet/netfilter/nf_tables_api.c:6828:void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-6829-\t\t\t\t struct nft_expr *expr)\n--\nnet/netfilter/nf_tables_api.c-6838-\nnet/netfilter/nf_tables_api.c:6839:void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,\nnet/netfilter/nf_tables_api.c-6840-\t\t\t struct nft_set_elem_expr *elem_expr)\n--\nnet/netfilter/nf_tables_api.c-6845-\tnft_setelem_expr_foreach(expr, elem_expr, size)\nnet/netfilter/nf_tables_api.c:6846:\t\t__nft_set_elem_expr_destroy(ctx, expr);\nnet/netfilter/nf_tables_api.c-6847-}\n--\nnet/netfilter/nf_tables_api.c=6850=static void __nft_set_elem_destroy(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-6860-\tif (destroy_expr \u0026\u0026 nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))\nnet/netfilter/nf_tables_api.c:6861:\t\tnft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));\nnet/netfilter/nf_tables_api.c-6862-\tif (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))\n--\nnet/netfilter/nf_tables_api.c=6898=void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,\n--\nnet/netfilter/nf_tables_api.c-6904-\tif (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))\nnet/netfilter/nf_tables_api.c:6905:\t\tnft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));\nnet/netfilter/nf_tables_api.c-6906-\n"
} |
| 43/2 | 2026/08/18 23:01 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15613 output: 144 thoughts: 178 Thoughts: **My Fuzzing Strategy for Netfilter nf_tables After This Patch** Okay, after reviewing this patch, I've zeroed in on the key areas. I'm thinking the functions `__nft_set_elem_expr_destroy`, `nft_set_elem_expr_destroy`, and `nf_tables_set_elem_destroy` are the most promising targets for fuzzing. The patch specifically addresses the destruction of cloned expressions within `nft_dynset`, which directly impacts how `nf_tables` handles set elements. Since this is fundamental to the core netfilter logic and is exposed to userspace through netlink, this makes it a prime candidate for fuzzing. I'll need to enable the `NF_TABLES` config as part of my fuzzing environment, of course. My reasoning is solid; this is a change in a core function that’s exposed externally, and that screams "fuzz me!" |
| 44/2 | 2026/08/18 23:01 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"NF_TABLES"
],
"FocusSymbols": [
"__nft_set_elem_expr_destroy",
"nft_set_elem_expr_destroy",
"nf_tables_set_elem_destroy"
],
"Reasoning": "The patch fixes a bug in the destruction of cloned expressions within `nft_dynset` by exposing and utilizing `__nft_set_elem_expr_destroy`. This is a functional change in the core netfilter nf_tables logic that manages set elements and expressions, which is reachable from userspace via netlink and should be fuzzed.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"NF_TABLES"
],
"FocusSymbols": [
"__nft_set_elem_expr_destroy",
"nft_set_elem_expr_destroy",
"nf_tables_set_elem_destroy"
],
"Reasoning": "The patch fixes a bug in the destruction of cloned expressions within `nft_dynset` by exposing and utilizing `__nft_set_elem_expr_destroy`. This is a functional change in the core netfilter nf_tables logic that manages set elements and expressions, which is reachable from userspace via netlink and should be fuzzed.",
"WorthFuzzing": true
} |
| 45/1 | 2026/08/18 23:01 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 46/2 | 2026/08/18 23:01 | agent | kmsan-evaluator |
0mModel:best-expensive Args: null Results: {
"KMSANReasoning": "The patch fixes an issue with the destruction of cloned expressions in `nft_dynset`. By introducing a `cloned` flag, it ensures that cloned expressions are destroyed using `__nft_set_elem_expr_destroy` (which calls `destroy_clone`) rather than `nft_expr_destroy`. This addresses a memory management bug, likely a use-after-free, double-free, or invalid free, which occurs when the wrong destruction path is taken. These types of memory corruption bugs are reliably detected by KASAN. The `struct nft_dynset` is an internal kernel structure and is not copied directly to userspace, so the introduction of the `cloned` bitfield does not pose an uninitialized memory info-leak risk. Therefore, KMSAN is not required.",
"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: For your convenience, here is the diff of the changes:
commit 9434240ef39148f3fcc4b58b082dd91bae80057f
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Aug 18 23:00:03 2026 +0000
syz-cluster: applied patch under review
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 3be612145c130..9bbf1868ce530 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -874,6 +874,8 @@ int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
struct nft_expr *expr_array[]);
void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
struct nft_set_elem_expr *elem_expr);
+void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
+ struct nft_expr *expr);
void nft_set_elem_destroy(const struct nft_set *set,
const struct nft_elem_priv *elem_priv,
bool destroy_expr);
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index af357f6c5070b..b7ca81d359218 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6825,8 +6825,8 @@ struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
return ERR_PTR(-EINVAL);
}
-static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
- struct nft_expr *expr)
+void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
+ struct nft_expr *expr)
{
if (expr->ops->destroy_clone) {
expr->ops->destroy_clone(ctx, expr);
diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index ee9d3e7b1ecf1..935a07b47a442 100644
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -19,7 +19,8 @@ struct nft_dynset {
u8 sreg_key;
u8 sreg_data;
bool invert;
- bool expr;
+ u8 expr:1,
+ cloned:1;
u8 num_exprs;
u64 timeout;
struct nft_expr *expr_array[NFT_SET_EXPR_MAX];
@@ -168,6 +169,19 @@ static const struct nla_policy nft_dynset_policy[NFTA_DYNSET_MAX + 1] = {
[NFTA_DYNSET_EXPRESSIONS] = { .type = NLA_NESTED },
};
+static void nft_dynset_expr_destroy(const struct nft_ctx *ctx,
+ struct nft_dynset *priv)
+{
+ int i;
+
+ for (i = 0; i < priv->num_exprs; i++) {
+ if (priv->cloned)
+ __nft_set_elem_expr_destroy(ctx, priv->expr_array[i]);
+ else
+ nft_expr_destroy(ctx, priv->expr_array[i]);
+ }
+}
+
static int nft_dynset_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
@@ -312,6 +326,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
return err;
priv->num_exprs = set->num_exprs;
+ priv->cloned = true;
}
nft_set_ext_prepare(&priv->tmpl);
@@ -339,8 +354,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
return 0;
err_expr_free:
- for (i = 0; i < priv->num_exprs; i++)
- nft_expr_destroy(ctx, priv->expr_array[i]);
+ nft_dynset_expr_destroy(ctx, priv);
return err;
}
@@ -365,11 +379,8 @@ static void nft_dynset_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
struct nft_dynset *priv = nft_expr_priv(expr);
- int i;
-
- for (i = 0; i < priv->num_exprs; i++)
- nft_expr_destroy(ctx, priv->expr_array[i]);
+ nft_dynset_expr_destroy(ctx, priv);
nf_tables_destroy_set(ctx, priv->set);
}
|
| 47/3 | 2026/08/18 23:01 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3099 output: 190 thoughts: 872 Thoughts: **Analyzing the `nft_dynset` Patch** Okay, so this patch is modifying `nft_dynset` within the netfilter framework. The core of the change revolves around how expression destruction is handled, specifically when dealing with cloned expressions. It's changing `bool expr` to `u8 expr:1, cloned:1;` within the `struct nft_dynset`. This immediately flags the memory management aspect. The crucial part is the addition of `nft_dynset_expr_destroy`. This function now conditionally destroys the expression based on the `cloned` flag. If `cloned` is true, it calls `__nft_set_elem_expr_destroy`; otherwise, it calls `nft_expr_destroy`. This directly addresses a bug where we were using the wrong destruction function. My first thought is this has to be a memory-related issue, like a use-after-free, double-free, or an invalid free. It's pretty clear: `nft_expr_destroy` does one thing, while `__nft_set_elem_expr_destroy` does something different, including calling `destroy_clone`. If we're calling the wrong one, we're likely corrupting memory. I'm thinking this is likely a use-after-free or a double-free, where the incorrect destruction function leads to freeing memory that shouldn't be, or failing to free what should be. That's a classic scenario for KASAN to catch. Let's quickly check for any uninitialized memory read or info-leak possibilities. The change is purely in how expressions are destroyed. No data is being copied to userspace directly. I need to make sure `cloned` is initialized properly. I'll need to check the allocation and initialization. `priv` is allocated via `nft_expr_priv(expr)` which comes from `nft_expr_info`, typically zero-allocated. `nft_dynset_init` explicitly sets `priv->cloned = true;` when expressions are cloned. If `priv` is zero-allocated, `cloned` defaults to 0 (false). Looking at the code, in `nf_tables_newexpr`, `expr = kzalloc(info->ops->size, GFP_KERNEL_ACCOUNT);`. Yep, it's zero-allocated, so `cloned` defaults to 0 (false) initially. The problem this patch fixes is clearly a memory corruption bug. Incorrect destruction of cloned expressions leading to potential use-after-free or invalid free issues. KASAN is definitely going to catch those. The struct itself isn't directly exposed to userspace, and it's built using individually constructed netlink attributes in `nft_dynset_dump`, so there is no information leakage from uninitialized memory. Therefore, KMSAN isn't needed here. The patch addresses memory management bug directly detectable by KASAN. |
| 48/3 | 2026/08/18 23:01 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch fixes an issue with the destruction of cloned expressions in `nft_dynset`. By introducing a `cloned` flag, it ensures that cloned expressions are destroyed using `__nft_set_elem_expr_destroy` (which calls `destroy_clone`) rather than `nft_expr_destroy`. This addresses a memory management bug, likely a use-after-free, double-free, or invalid free, which occurs when the wrong destruction path is taken. These types of memory corruption bugs are reliably detected by KASAN. The `struct nft_dynset` is an internal kernel structure and is not copied directly to userspace, so the introduction of the `cloned` bitfield does not pose an uninitialized memory info-leak risk. Therefore, KMSAN is not required.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch fixes an issue with the destruction of cloned expressions in `nft_dynset`. By introducing a `cloned` flag, it ensures that cloned expressions are destroyed using `__nft_set_elem_expr_destroy` (which calls `destroy_clone`) rather than `nft_expr_destroy`. This addresses a memory management bug, likely a use-after-free, double-free, or invalid free, which occurs when the wrong destruction path is taken. These types of memory corruption bugs are reliably detected by KASAN. The `struct nft_dynset` is an internal kernel structure and is not copied directly to userspace, so the introduction of the `cloned` bitfield does not pose an uninitialized memory info-leak risk. Therefore, KMSAN is not required.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|