AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only adds a new user-space self-test (netlink_policy_dump_opid.c) and updates selftest build files in tools/testing/selftests/net/. It does not touch the Linux kernel source tree (vmlinux or kernel modules) and therefore does not warrant fuzzing.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit bbd258d2acc0d15ec8ff27d2797067e9c45d4a9e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Oct 8 11:41:13 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore\nindex dacd36ed8455e..5fa1c6024672b 100644\n--- a/tools/testing/selftests/net/.gitignore\n+++ b/tools/testing/selftests/net/.gitignore\n@@ -20,6 +20,7 @@ ipv6_fragmentation\n log.txt\n msg_zerocopy\n netlink-dumps\n+netlink_policy_dump_opid\n nettest\n proc_net_pktgen\n psock_fanout\ndiff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile\nindex 590b33e16d9fb..09960735cb1ad 100644\n--- a/tools/testing/selftests/net/Makefile\n+++ b/tools/testing/selftests/net/Makefile\n@@ -186,6 +186,7 @@ TEST_GEN_PROGS := \\\n \ticmp_rfc4884 \\\n \tipv6_flowlabel_mgr \\\n \tipv6_fragmentation \\\n+\tnetlink_policy_dump_opid \\\n \tproc_net_pktgen \\\n \treuseaddr_conflict \\\n \treuseport_bpf \\\ndiff --git a/tools/testing/selftests/net/netlink_policy_dump_opid.c b/tools/testing/selftests/net/netlink_policy_dump_opid.c\nnew file mode 100644\nindex 0000000000000..4b53a88531092\n--- /dev/null\n+++ b/tools/testing/selftests/net/netlink_policy_dump_opid.c\n@@ -0,0 +1,223 @@\n+// SPDX-License-Identifier: GPL-2.0\n+\n+#include \u003cerrno.h\u003e\n+#include \u003cstdbool.h\u003e\n+#include \u003cstdint.h\u003e\n+#include \u003cstring.h\u003e\n+#include \u003csys/socket.h\u003e\n+#include \u003cunistd.h\u003e\n+\n+#include \u003clinux/genetlink.h\u003e\n+#include \u003clinux/netlink.h\u003e\n+\n+#include \"kselftest.h\"\n+\n+#define REQUEST_SIZE 128\n+#define REPLY_SIZE 4096\n+\n+struct genl_request {\n+\tstruct nlmsghdr nlh;\n+\tstruct genlmsghdr genl;\n+\tchar attrs[REQUEST_SIZE];\n+};\n+\n+static int add_attr(struct genl_request *request, size_t size, uint16_t type,\n+\t\t    const void *data, size_t data_size)\n+{\n+\tsize_t offset = NLMSG_ALIGN(request-\u003enlh.nlmsg_len);\n+\tsize_t attr_size = NLA_HDRLEN + data_size;\n+\tsize_t aligned_size = NLA_ALIGN(attr_size);\n+\tstruct nlattr *attr;\n+\n+\tif (offset + aligned_size \u003e size)\n+\t\treturn -E2BIG;\n+\n+\tattr = (struct nlattr *)((char *)request + offset);\n+\tattr-\u003enla_len = attr_size;\n+\tattr-\u003enla_type = type;\n+\tmemcpy((char *)attr + NLA_HDRLEN, data, data_size);\n+\tmemset((char *)attr + attr_size, 0, aligned_size - attr_size);\n+\trequest-\u003enlh.nlmsg_len = offset + aligned_size;\n+\n+\treturn 0;\n+}\n+\n+static int next_attr(const char **cursor, size_t *remaining,\n+\t\t     struct nlattr **attr)\n+{\n+\tsize_t length, aligned_length;\n+\n+\tif (!*remaining)\n+\t\treturn 0;\n+\tif (*remaining \u003c NLA_HDRLEN)\n+\t\treturn -EBADMSG;\n+\n+\t*attr = (struct nlattr *)*cursor;\n+\tlength = (*attr)-\u003enla_len;\n+\tif (length \u003c NLA_HDRLEN || length \u003e *remaining)\n+\t\treturn -EBADMSG;\n+\taligned_length = NLA_ALIGN(length);\n+\tif (aligned_length \u003e *remaining)\n+\t\treturn -EBADMSG;\n+\n+\t*cursor += aligned_length;\n+\t*remaining -= aligned_length;\n+\treturn 1;\n+}\n+\n+static int find_op_id(const struct nlattr *op_policy, bool *found)\n+{\n+\tconst char *cursor = (const char *)op_policy + NLA_HDRLEN;\n+\tsize_t remaining = op_policy-\u003enla_len - NLA_HDRLEN;\n+\tstruct nlattr *attr;\n+\tint ret;\n+\n+\twhile ((ret = next_attr(\u0026cursor, \u0026remaining, \u0026attr)) \u003e 0) {\n+\t\tif ((attr-\u003enla_type \u0026 NLA_TYPE_MASK) == CTRL_CMD_GETPOLICY)\n+\t\t\t*found = true;\n+\t}\n+\n+\treturn ret;\n+}\n+\n+static int parse_policy_message(const struct nlmsghdr *nlh, bool *found)\n+{\n+\tconst char *cursor = (const char *)nlh + NLMSG_LENGTH(GENL_HDRLEN);\n+\tsize_t remaining = nlh-\u003enlmsg_len - NLMSG_LENGTH(GENL_HDRLEN);\n+\tstruct nlattr *attr;\n+\tint ret;\n+\n+\twhile ((ret = next_attr(\u0026cursor, \u0026remaining, \u0026attr)) \u003e 0) {\n+\t\tif ((attr-\u003enla_type \u0026 NLA_TYPE_MASK) == CTRL_ATTR_OP_POLICY) {\n+\t\t\tret = find_op_id(attr, found);\n+\t\t\tif (ret \u003c 0)\n+\t\t\t\treturn ret;\n+\t\t}\n+\t}\n+\n+\treturn ret;\n+}\n+\n+static int check_policy_dump(int fd)\n+{\n+\tstruct genl_request request = {\n+\t\t.nlh = {\n+\t\t\t.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN),\n+\t\t\t.nlmsg_type = GENL_ID_CTRL,\n+\t\t\t.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP | NLM_F_ACK,\n+\t\t\t.nlmsg_seq = 1,\n+\t\t},\n+\t\t.genl = {\n+\t\t\t.cmd = CTRL_CMD_GETPOLICY,\n+\t\t\t.version = 1,\n+\t\t},\n+\t};\n+\tchar reply[REPLY_SIZE];\n+\tconst __u16 family_id = GENL_ID_CTRL;\n+\tconst __u32 op = CTRL_CMD_GETPOLICY;\n+\tbool found_op = false;\n+\tstruct sockaddr_nl kernel = {\n+\t\t.nl_family = AF_NETLINK,\n+\t};\n+\tssize_t sent;\n+\tint ret;\n+\n+\tret = add_attr(\u0026request, sizeof(request), CTRL_ATTR_FAMILY_ID,\n+\t\t       \u0026family_id, sizeof(family_id));\n+\tif (ret)\n+\t\treturn ret;\n+\tret = add_attr(\u0026request, sizeof(request), CTRL_ATTR_OP,\n+\t\t       \u0026op, sizeof(op));\n+\tif (ret)\n+\t\treturn ret;\n+\n+\tsent = sendto(fd, \u0026request, request.nlh.nlmsg_len, 0,\n+\t\t      (struct sockaddr *)\u0026kernel, sizeof(kernel));\n+\tif (sent \u003c 0)\n+\t\treturn -errno;\n+\tif (sent != request.nlh.nlmsg_len)\n+\t\treturn -EIO;\n+\n+\tfor (;;) {\n+\t\tssize_t received = recv(fd, reply, sizeof(reply), 0);\n+\t\tsize_t offset = 0;\n+\n+\t\tif (received \u003c 0) {\n+\t\t\tif (errno == EINTR)\n+\t\t\t\tcontinue;\n+\t\t\treturn -errno;\n+\t\t}\n+\n+\t\twhile (offset + NLMSG_HDRLEN \u003c= received) {\n+\t\t\tstruct nlmsghdr *nlh = (struct nlmsghdr *)(reply + offset);\n+\t\t\tsize_t aligned_length;\n+\n+\t\t\tif (nlh-\u003enlmsg_len \u003c NLMSG_HDRLEN ||\n+\t\t\t    nlh-\u003enlmsg_len \u003e received - offset)\n+\t\t\t\treturn -EBADMSG;\n+\t\t\tif (nlh-\u003enlmsg_seq != 1) {\n+\t\t\t\toffset += NLMSG_ALIGN(nlh-\u003enlmsg_len);\n+\t\t\t\tcontinue;\n+\t\t\t}\n+\t\t\tif (nlh-\u003enlmsg_type == NLMSG_ERROR) {\n+\t\t\t\tint error;\n+\n+\t\t\t\tif (nlh-\u003enlmsg_len \u003c NLMSG_LENGTH(sizeof(error)))\n+\t\t\t\t\treturn -EBADMSG;\n+\t\t\t\terror = *(int *)NLMSG_DATA(nlh);\n+\t\t\t\tif (error)\n+\t\t\t\t\treturn error;\n+\t\t\t} else if (nlh-\u003enlmsg_type == NLMSG_DONE) {\n+\t\t\t\tif (nlh-\u003enlmsg_flags \u0026 NLM_F_DUMP_INTR)\n+\t\t\t\t\treturn -EINTR;\n+\t\t\t\treturn found_op ? 0 : -ENOENT;\n+\t\t\t} else if (nlh-\u003enlmsg_type == GENL_ID_CTRL) {\n+\t\t\t\tif (nlh-\u003enlmsg_len \u003c NLMSG_LENGTH(GENL_HDRLEN))\n+\t\t\t\t\treturn -EBADMSG;\n+\t\t\t\tret = parse_policy_message(nlh, \u0026found_op);\n+\t\t\t\tif (ret \u003c 0)\n+\t\t\t\t\treturn ret;\n+\t\t\t}\n+\n+\t\t\taligned_length = NLMSG_ALIGN(nlh-\u003enlmsg_len);\n+\t\t\tif (aligned_length \u003e received - offset)\n+\t\t\t\treturn -EBADMSG;\n+\t\t\toffset += aligned_length;\n+\t\t}\n+\t}\n+}\n+\n+int main(void)\n+{\n+\tstruct sockaddr_nl local = {\n+\t\t.nl_family = AF_NETLINK,\n+\t};\n+\tint fd, ret;\n+\n+\tksft_print_header();\n+\tksft_set_plan(1);\n+\n+\tfd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_GENERIC);\n+\tif (fd \u003c 0)\n+\t\tksft_exit_fail_perror(\"opening generic-netlink socket\");\n+\tif (bind(fd, (struct sockaddr *)\u0026local, sizeof(local))) {\n+\t\tclose(fd);\n+\t\tksft_exit_fail_perror(\"binding generic-netlink socket\");\n+\t}\n+\n+\tret = check_policy_dump(fd);\n+\tif (close(fd) \u0026\u0026 !ret)\n+\t\tret = -errno;\n+\tif (ret == -ENOENT) {\n+\t\tksft_test_result_fail(\"missing policy op id %u\\n\",\n+\t\t\t\t      CTRL_CMD_GETPOLICY);\n+\t} else if (ret) {\n+\t\terrno = -ret;\n+\t\tksft_test_result_fail(\"GETPOLICY dump failed: %s\\n\",\n+\t\t\t\t      strerror(errno));\n+\t} else {\n+\t\tksft_test_result_pass(\"policy dump identified command id %u\\n\",\n+\t\t\t\t      CTRL_CMD_GETPOLICY);\n+\t}\n+\tksft_finished();\n+}\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only adds a new user-space self-test (netlink_policy_dump_opid.c) and updates selftest build files in tools/testing/selftests/net/. It does not touch the Linux kernel source tree (vmlinux or kernel modules) and therefore does not warrant fuzzing.",
  "WorthFuzzing": false
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit bbd258d2acc0d15ec8ff27d2797067e9c45d4a9e
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Oct 8 11:41:13 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
index dacd36ed8455e..5fa1c6024672b 100644
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -20,6 +20,7 @@ ipv6_fragmentation
 log.txt
 msg_zerocopy
 netlink-dumps
+netlink_policy_dump_opid
 nettest
 proc_net_pktgen
 psock_fanout
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 590b33e16d9fb..09960735cb1ad 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -186,6 +186,7 @@ TEST_GEN_PROGS := \
 	icmp_rfc4884 \
 	ipv6_flowlabel_mgr \
 	ipv6_fragmentation \
+	netlink_policy_dump_opid \
 	proc_net_pktgen \
 	reuseaddr_conflict \
 	reuseport_bpf \
diff --git a/tools/testing/selftests/net/netlink_policy_dump_opid.c b/tools/testing/selftests/net/netlink_policy_dump_opid.c
new file mode 100644
index 0000000000000..4b53a88531092
--- /dev/null
+++ b/tools/testing/selftests/net/netlink_policy_dump_opid.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <linux/genetlink.h>
+#include <linux/netlink.h>
+
+#include "kselftest.h"
+
+#define REQUEST_SIZE 128
+#define REPLY_SIZE 4096
+
+struct genl_request {
+	struct nlmsghdr nlh;
+	struct genlmsghdr genl;
+	char attrs[REQUEST_SIZE];
+};
+
+static int add_attr(struct genl_request *request, size_t size, uint16_t type,
+		    const void *data, size_t data_size)
+{
+	size_t offset = NLMSG_ALIGN(request->nlh.nlmsg_len);
+	size_t attr_size = NLA_HDRLEN + data_size;
+	size_t aligned_size = NLA_ALIGN(attr_size);
+	struct nlattr *attr;
+
+	if (offset + aligned_size > size)
+		return -E2BIG;
+
+	attr = (struct nlattr *)((char *)request + offset);
+	attr->nla_len = attr_size;
+	attr->nla_type = type;
+	memcpy((char *)attr + NLA_HDRLEN, data, data_size);
+	memset((char *)attr + attr_size, 0, aligned_size - attr_size);
+	request->nlh.nlmsg_len = offset + aligned_size;
+
+	return 0;
+}
+
+static int next_attr(const char **cursor, size_t *remaining,
+		     struct nlattr **attr)
+{
+	size_t length, aligned_length;
+
+	if (!*remaining)
+		return 0;
+	if (*remaining < NLA_HDRLEN)
+		return -EBADMSG;
+
+	*attr = (struct nlattr *)*cursor;
+	length = (*attr)->nla_len;
+	if (length < NLA_HDRLEN || length > *remaining)
+		return -EBADMSG;
+	aligned_length = NLA_ALIGN(length);
+	if (aligned_length > *remaining)
+		return -EBADMSG;
+
+	*cursor += aligned_length;
+	*remaining -= aligned_length;
+	return 1;
+}
+
+static int find_op_id(const struct nlattr *op_policy, bool *found)
+{
+	const char *cursor = (const char *)op_policy + NLA_HDRLEN;
+	size_t remaining = op_policy->nla_len - NLA_HDRLEN;
+	struct nlattr *attr;
+	int ret;
+
+	while ((ret = next_attr(&cursor, &remaining, &attr)) > 0) {
+		if ((attr->nla_type & NLA_TYPE_MASK) == CTRL_CMD_GETPOLICY)
+			*found = true;
+	}
+
+	return ret;
+}
+
+static int parse_policy_message(const struct nlmsghdr *nlh, bool *found)
+{
+	const char *cursor = (const char *)nlh + NLMSG_LENGTH(GENL_HDRLEN);
+	size_t remaining = nlh->nlmsg_len - NLMSG_LENGTH(GENL_HDRLEN);
+	struct nlattr *attr;
+	int ret;
+
+	while ((ret = next_attr(&cursor, &remaining, &attr)) > 0) {
+		if ((attr->nla_type & NLA_TYPE_MASK) == CTRL_ATTR_OP_POLICY) {
+			ret = find_op_id(attr, found);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return ret;
+}
+
+static int check_policy_dump(int fd)
+{
+	struct genl_request request = {
+		.nlh = {
+			.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN),
+			.nlmsg_type = GENL_ID_CTRL,
+			.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP | NLM_F_ACK,
+			.nlmsg_seq = 1,
+		},
+		.genl = {
+			.cmd = CTRL_CMD_GETPOLICY,
+			.version = 1,
+		},
+	};
+	char reply[REPLY_SIZE];
+	const __u16 family_id = GENL_ID_CTRL;
+	const __u32 op = CTRL_CMD_GETPOLICY;
+	bool found_op = false;
+	struct sockaddr_nl kernel = {
+		.nl_family = AF_NETLINK,
+	};
+	ssize_t sent;
+	int ret;
+
+	ret = add_attr(&request, sizeof(request), CTRL_ATTR_FAMILY_ID,
+		       &family_id, sizeof(family_id));
+	if (ret)
+		return ret;
+	ret = add_attr(&request, sizeof(request), CTRL_ATTR_OP,
+		       &op, sizeof(op));
+	if (ret)
+		return ret;
+
+	sent = sendto(fd, &request, request.nlh.nlmsg_len, 0,
+		      (struct sockaddr *)&kernel, sizeof(kernel));
+	if (sent < 0)
+		return -errno;
+	if (sent != request.nlh.nlmsg_len)
+		return -EIO;
+
+	for (;;) {
+		ssize_t received = recv(fd, reply, sizeof(reply), 0);
+		size_t offset = 0;
+
+		if (received < 0) {
+			if (errno == EINTR)
+				continue;
+			return -errno;
+		}
+
+		while (offset + NLMSG_HDRLEN <= received) {
+			struct nlmsghdr *nlh = (struct nlmsghdr *)(reply + offset);
+			size_t aligned_length;
+
+			if (nlh->nlmsg_len < NLMSG_HDRLEN ||
+			    nlh->nlmsg_len > received - offset)
+				return -EBADMSG;
+			if (nlh->nlmsg_seq != 1) {
+				offset += NLMSG_ALIGN(nlh->nlmsg_len);
+				continue;
+			}
+			if (nlh->nlmsg_type == NLMSG_ERROR) {
+				int error;
+
+				if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(error)))
+					return -EBADMSG;
+				error = *(int *)NLMSG_DATA(nlh);
+				if (error)
+					return error;
+			} else if (nlh->nlmsg_type == NLMSG_DONE) {
+				if (nlh->nlmsg_flags & NLM_F_DUMP_INTR)
+					return -EINTR;
+				return found_op ? 0 : -ENOENT;
+			} else if (nlh->nlmsg_type == GENL_ID_CTRL) {
+				if (nlh->nlmsg_len < NLMSG_LENGTH(GENL_HDRLEN))
+					return -EBADMSG;
+				ret = parse_policy_message(nlh, &found_op);
+				if (ret < 0)
+					return ret;
+			}
+
+			aligned_length = NLMSG_ALIGN(nlh->nlmsg_len);
+			if (aligned_length > received - offset)
+				return -EBADMSG;
+			offset += aligned_length;
+		}
+	}
+}
+
+int main(void)
+{
+	struct sockaddr_nl local = {
+		.nl_family = AF_NETLINK,
+	};
+	int fd, ret;
+
+	ksft_print_header();
+	ksft_set_plan(1);
+
+	fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_GENERIC);
+	if (fd < 0)
+		ksft_exit_fail_perror("opening generic-netlink socket");
+	if (bind(fd, (struct sockaddr *)&local, sizeof(local))) {
+		close(fd);
+		ksft_exit_fail_perror("binding generic-netlink socket");
+	}
+
+	ret = check_policy_dump(fd);
+	if (close(fd) && !ret)
+		ret = -errno;
+	if (ret == -ENOENT) {
+		ksft_test_result_fail("missing policy op id %u\n",
+				      CTRL_CMD_GETPOLICY);
+	} else if (ret) {
+		errno = -ret;
+		ksft_test_result_fail("GETPOLICY dump failed: %s\n",
+				      strerror(errno));
+	} else {
+		ksft_test_result_pass("policy dump identified command id %u\n",
+				      CTRL_CMD_GETPOLICY);
+	}
+	ksft_finished();
+}

gemini-3.8-flash

null

null

							input: 5611
							output: 98
							thoughts: 817
						

**Analysis of the Patch for Fuzzing Worthiness**

Okay, let's break this down. The patch in question is focused solely on the `tools/testing/selftests/net/` directory. My immediate thought is, "Ah, self-tests under `tools/` - that's a red flag in terms of fuzzing applicability, but I need to be methodical."

I'll check Section 2 of the prompt to see when to set `WorthFuzzing=false`. The criteria list explicitly includes, "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." Bingo! That seems to be the nail on the head.

I need to confirm the scope. The patch modifies:
- `.gitignore`
- `Makefile`
- `netlink_policy_dump_opid.c`

All of these are *within* `tools/testing/selftests/net/`. No other files are touched. This is consistent with what I'm seeing and I can confirm that the provided diff in the prompt is comprehensive and explicit. No need for grepper or `git` commands; the evidence is right here.

Based on the prompt's criteria, this *definitely* falls under the "not worth fuzzing" category. I can confidently set `WorthFuzzing=false`. Since `WorthFuzzing` is `false`, the instructions state that `FocusSymbols` and `EnableConfigs` should be empty lists (`[]`).

Now I just need to craft the reasoning for the verdict:

"The patch only modifies files in `tools/testing/selftests/net/` (specifically adding a new selftest `netlink_policy_dump_opid.c` and updating the corresponding Makefile and .gitignore). These user-space test changes do not modify the kernel image (vmlinux) or any kernel modules. Therefore, it is not worth fuzzing."

So, I'm ready to set the results: `set-results(EnableConfigs=[], FocusSymbols=[], Reasoning="The patch only modifies files in `tools/testing/selftests/net/` (specifically adding a new selftest `netlink_policy_dump_opid.c` and updating the corresponding Makefile and .gitignore). These user-space test changes do not modify the kernel image (vmlinux) or any kernel modules. Therefore, it is not worth fuzzing.", WorthFuzzing=false)`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only adds a new user-space self-test (netlink_policy_dump_opid.c) and updates selftest build files in tools/testing/selftests/net/. It does not touch the Linux kernel source tree (vmlinux or kernel modules) and therefore does not warrant fuzzing.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only adds a new user-space self-test (netlink_policy_dump_opid.c) and updates selftest build files in tools/testing/selftests/net/. It does not touch the Linux kernel source tree (vmlinux or kernel modules) and therefore does not warrant fuzzing.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null