AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/09/12 13:23	flow	patch-triage	2m Args: null Results: { "EnableConfigs": [ "NFC", "NFC_DIGITAL", "NFC_SIM", "NFC_PORT100" ], "FocusSymbols": [ "digital_tg_recv_dep_req", "digital_tg_send_dep_res", "digital_tg_recv_atr_req" ], "KMSANReasoning": "The patch fixes a potential out-of-bounds read in `digital_tg_recv_dep_req()` where `resp-\u003edata[3]` was read without first verifying that `resp-\u003elen` was at least `size + 1` (4 bytes). \n\nThis is a bounds-checking issue: accessing bytes beyond `resp-\u003elen` is an out-of-bounds access directly detectable by KASAN (e.g., slab-out-of-bounds on skb data). The change does not introduce any uninitialized stack or heap variables, does not expose uninitialized padding or struct fields to user space, and does not alter control flow based on uninitialized memory. Because standard KASAN fully covers this class of bugs and no uninitialized memory risks are introduced, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false, "Reasoning": "The patch modifies input validation in the NFC digital target mode DEP request handling (digital_tg_recv_dep_req) to prevent out-of-bounds access when the DID bit is set by verifying frame length against expected size and correctly indexing resp-\u003edata. The code is reachable in virtualized environments via virtual NFC drivers (e.g. nfcsim) and emulated USB NFC dongles (port100), making it worth fuzzing for boundary issues and state transitions.", "WorthFuzzing": true }
1/1	2026/09/12 13:23	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 1020f269e855667140bc04f83a96849909af75dd\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sat Sep 12 13:23:30 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c\nindex 3982fa084737f..ae5407fca12d4 100644\n--- a/net/nfc/digital_dep.c\n+++ b/net/nfc/digital_dep.c\n@@ -1117,12 +1117,12 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\n \tpfb = dep_req-\u003epfb;\n \n \tif (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {\n-\t\tif (ddev-\u003edid \u0026\u0026 (ddev-\u003edid == resp-\u003edata[3])) {\n-\t\t\tsize++;\n-\t\t} else {\n+\t\tif (resp-\u003elen \u003c size + 1 \|\| !ddev-\u003edid \|\|\n+\t\t ddev-\u003edid != resp-\u003edata[size]) {\n \t\t\trc = -EIO;\n \t\t\tgoto exit;\n \t\t}\n+\t\tsize++;\n \t} else if (ddev-\u003edid) {\n \t\trc = -EIO;\n \t\tgoto exit;\n" }
2/1	2026/09/12 13:23	agent	patch-evaluator	2m Model: core Args: null Results: { "EnableConfigs": [ "NFC", "NFC_DIGITAL", "NFC_SIM", "NFC_PORT100" ], "FocusSymbols": [ "digital_tg_recv_dep_req", "digital_tg_send_dep_res", "digital_tg_recv_atr_req" ], "Reasoning": "The patch modifies input validation in the NFC digital target mode DEP request handling (digital_tg_recv_dep_req) to prevent out-of-bounds access when the DID bit is set by verifying frame length against expected size and correctly indexing resp-\u003edata. The code is reachable in virtualized environments via virtual NFC drivers (e.g. nfcsim) and emulated USB NFC dongles (port100), making it worth fuzzing for boundary issues and state transitions.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 1020f269e855667140bc04f83a96849909af75dd Author: syz-cluster <triage@syzkaller.com> Date: Sat Sep 12 13:23:30 2026 +0000 syz-cluster: applied patch under review diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c index 3982fa084737f..ae5407fca12d4 100644 --- a/net/nfc/digital_dep.c +++ b/net/nfc/digital_dep.c @@ -1117,12 +1117,12 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg, pfb = dep_req->pfb; if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { - if (ddev->did && (ddev->did == resp->data[3])) { - size++; - } else { + if (resp->len < size + 1 \|\| !ddev->did \|\| + ddev->did != resp->data[size]) { rc = -EIO; goto exit; } + size++; } else if (ddev->did) { rc = -EIO; goto exit;
3/2	2026/09/12 13:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2959 output: 39 thoughts: 461 Thoughts: Triage of `net/nfc/digital_dep.c` Patch for Syzkaller Fuzzing Okay, so I've got a patch for `net/nfc/digital_dep.c` and my goal is to figure out if it's worth throwing at syzkaller. First, let's do a quick risk assessment. This is just routine kernel code review, looking for potential bugs to feed into the fuzzing pipeline – purely defensive security stuff, no nefarious intent here. I'm just analyzing a code change and assessing its potential for exploitation through fuzzing. That seems totally benign and falls squarely within my remit. Now, let's dive into the patch itself. It looks like we've got a change in `digital_tg_recv_dep_req`. The original check was comparing a device ID (`ddev->did`) with `resp->data[3]` when the `DIGITAL_NFC_DEP_DID_BIT_SET` is true. The patch has changed that check. It now checks the length `resp->len` is greater than or equal to `size+1`. It also checks if a device ID `ddev->did` exists, and if it does, it checks that the expected DID (`ddev->did`) matches `resp->data[size]`. If any of these checks fail, it returns an `EIO` error. So we have more comprehensive checks. The key here is understanding the context of that function, `digital_tg_recv_dep_req`. I need to figure out what's going on around this code. Let's see what the function does - which I can do using my trusty tools. I'll use either `read-file` or `grepper` to see how the function is used, what data structures it operates on, and what the overall flow is. That'll provide the necessary context to determine if this patch is actually interesting from a fuzzing perspective, and identify critical code paths and potential focus symbols for syzkaller. After this, I need to come up with some reasoning to explain this decision.
4/2	2026/09/12 13:23	tool	read-file	0m Args: { "File": "net/nfc/digital_dep.c", "FirstLine": 1100, "LineCount": 50 } Results: { "Contents": "1100:\t\t\tgoto exit;\n1101:\t\t}\n1102:\t\n1103:\t\tif (resp-\u003elen \u003e ddev-\u003elocal_payload_max) {\n1104:\t\t\trc = -EMSGSIZE;\n1105:\t\t\tgoto exit;\n1106:\t\t}\n1107:\t\n1108:\t\tsize = sizeof(struct digital_dep_req_res);\n1109:\t\tdep_req = (struct digital_dep_req_res )resp-\u003edata;\n1110:\t\n1111:\t\tif (resp-\u003elen \u003c size \|\| dep_req-\u003edir != DIGITAL_NFC_DEP_FRAME_DIR_OUT \|\|\n1112:\t\t dep_req-\u003ecmd != DIGITAL_CMD_DEP_REQ) {\n1113:\t\t\trc = -EIO;\n1114:\t\t\tgoto exit;\n1115:\t\t}\n1116:\t\n1117:\t\tpfb = dep_req-\u003epfb;\n1118:\t\n1119:\t\tif (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {\n1120:\t\t\tif (resp-\u003elen \u003c size + 1 \|\| !ddev-\u003edid \|\|\n1121:\t\t\t ddev-\u003edid != resp-\u003edata[size]) {\n1122:\t\t\t\trc = -EIO;\n1123:\t\t\t\tgoto exit;\n1124:\t\t\t}\n1125:\t\t\tsize++;\n1126:\t\t} else if (ddev-\u003edid) {\n1127:\t\t\trc = -EIO;\n1128:\t\t\tgoto exit;\n1129:\t\t}\n1130:\t\n1131:\t\tif (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {\n1132:\t\t\trc = -EIO;\n1133:\t\t\tgoto exit;\n1134:\t\t}\n1135:\t\n1136:\t\tif (size \u003e resp-\u003elen) {\n1137:\t\t\trc = -EIO;\n1138:\t\t\tgoto exit;\n1139:\t\t}\n1140:\t\n1141:\t\tskb_pull(resp, size);\n1142:\t\n1143:\t\tswitch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {\n1144:\t\tcase DIGITAL_NFC_DEP_PFB_I_PDU:\n1145:\t\t\tpr_debug(\"DIGITAL_NFC_DEP_PFB_I_PDU\\n\");\n1146:\t\n1147:\t\t\tif (ddev-\u003eatn_count) {\n1148:\t\t\t\t/ The target has received (and replied to) at least one\n1149:\t\t\t\t * ATN DEP_REQ.\n" }
5/2	2026/09/12 13:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 4624 output: 30 thoughts: 171 Thoughts: My Initial Thoughts on NFC Fuzzing in Syzkaller Okay, so I'm looking at `net/nfc/digital_dep.c`, which I know is part of the NFC Digital Protocol within the NFC subsystem. My immediate question is: can we even reach NFC within the standard Syzkaller setup or a virtualized environment? I'm thinking QEMU or Google Compute Engine, typical fuzzing scenarios. Hold on, I vaguely recall some mention of NFC fuzzing in Syzkaller. Let's confirm - does Syzkaller actually support NFC, or am I mistaken? If so, what drivers or interfaces enable this support? My mind is racing through possibilities. I'm thinking of drivers like `nfcsim` (that's the NFC simulator driver, right? `drivers/nfc/nfcsim.c`), virtual NFC interfaces, raw sockets, Netlink, and even that clever pn533 USB emulation through the syzkaller USB raw gadget. Now I have to go through `nfcsim` or other virtual drivers from the kernel tree for more insights.
6/2	2026/09/12 13:23	tool	grepper	0m Args: { "Expression": "nfc_digital_dev", "PathPrefix": "drivers/nfc" } Results: { "Output": "drivers/nfc/nfcsim.c-15-\ndrivers/nfc/nfcsim.c:16:#define NFCSIM_ERR(d, fmt, args...) nfc_err(\u0026d-\u003enfc_digital_dev-\u003enfc_dev-\u003edev, \\\ndrivers/nfc/nfcsim.c-17-\t\t\t\t\t \"%s: \" fmt, __func__, ## args)\ndrivers/nfc/nfcsim.c-18-\ndrivers/nfc/nfcsim.c:19:#define NFCSIM_DBG(d, fmt, args...) dev_dbg(\u0026d-\u003enfc_digital_dev-\u003enfc_dev-\u003edev, \\\ndrivers/nfc/nfcsim.c-20-\t\t\t\t\t \"%s: \" fmt, __func__, ## args)\n--\ndrivers/nfc/nfcsim.c=31=struct nfcsim {\ndrivers/nfc/nfcsim.c:32:\tstruct nfc_digital_dev nfc_digital_dev;\ndrivers/nfc/nfcsim.c-33-\n--\ndrivers/nfc/nfcsim.c=182=static void nfcsim_recv_wq(struct work_struct work)\n--\ndrivers/nfc/nfcsim.c-197-\ndrivers/nfc/nfcsim.c:198:\tdev-\u003ecb(dev-\u003enfc_digital_dev, dev-\u003earg, skb);\ndrivers/nfc/nfcsim.c-199-}\ndrivers/nfc/nfcsim.c-200-\ndrivers/nfc/nfcsim.c:201:static int nfcsim_send(struct nfc_digital_dev ddev, struct sk_buff skb,\ndrivers/nfc/nfcsim.c-202-\t\t u16 timeout, nfc_digital_cmd_complete_t cb, void arg)\n--\ndrivers/nfc/nfcsim.c-239-\ndrivers/nfc/nfcsim.c:240:static void nfcsim_abort_cmd(struct nfc_digital_dev ddev)\ndrivers/nfc/nfcsim.c-241-{\n--\ndrivers/nfc/nfcsim.c-246-\ndrivers/nfc/nfcsim.c:247:static int nfcsim_switch_rf(struct nfc_digital_dev ddev, bool on)\ndrivers/nfc/nfcsim.c-248-{\n--\ndrivers/nfc/nfcsim.c-255-\ndrivers/nfc/nfcsim.c:256:static int nfcsim_in_configure_hw(struct nfc_digital_dev ddev,\ndrivers/nfc/nfcsim.c-257-\t\t\t\t\t int type, int param)\n--\ndrivers/nfc/nfcsim.c-278-\ndrivers/nfc/nfcsim.c:279:static int nfcsim_in_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/nfcsim.c-280-\t\t\t struct sk_buff skb, u16 timeout,\n--\ndrivers/nfc/nfcsim.c-285-\ndrivers/nfc/nfcsim.c:286:static int nfcsim_tg_configure_hw(struct nfc_digital_dev ddev,\ndrivers/nfc/nfcsim.c-287-\t\t\t\t\t int type, int param)\n--\ndrivers/nfc/nfcsim.c-308-\ndrivers/nfc/nfcsim.c:309:static int nfcsim_tg_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/nfcsim.c-310-\t\t\t struct sk_buff skb, u16 timeout,\n--\ndrivers/nfc/nfcsim.c-315-\ndrivers/nfc/nfcsim.c:316:static int nfcsim_tg_listen(struct nfc_digital_dev ddev, u16 timeout,\ndrivers/nfc/nfcsim.c-317-\t\t\t nfc_digital_cmd_complete_t cb, void arg)\n--\ndrivers/nfc/nfcsim.c=346=static void nfcsim_debugfs_init_dev(struct nfcsim dev)\n--\ndrivers/nfc/nfcsim.c-357-\ndrivers/nfc/nfcsim.c:358:\tidx = dev-\u003enfc_digital_dev-\u003enfc_dev-\u003eidx;\ndrivers/nfc/nfcsim.c-359-\tn = snprintf(devname, sizeof(devname), \"nfc%d\", idx);\n--\ndrivers/nfc/nfcsim.c=370=static struct nfcsim nfcsim_device_new(struct nfcsim_link link_in,\n--\ndrivers/nfc/nfcsim.c-382-\ndrivers/nfc/nfcsim.c:383:\tdev-\u003enfc_digital_dev =\ndrivers/nfc/nfcsim.c-384-\t\t\tnfc_digital_allocate_device(\u0026nfcsim_digital_ops,\n--\ndrivers/nfc/nfcsim.c-387-\t\t\t\t\t\t 0, 0);\ndrivers/nfc/nfcsim.c:388:\tif (!dev-\u003enfc_digital_dev) {\ndrivers/nfc/nfcsim.c-389-\t\tkfree(dev);\n--\ndrivers/nfc/nfcsim.c-392-\ndrivers/nfc/nfcsim.c:393:\tnfc_digital_set_drvdata(dev-\u003enfc_digital_dev, dev);\ndrivers/nfc/nfcsim.c-394-\n--\ndrivers/nfc/nfcsim.c-397-\ndrivers/nfc/nfcsim.c:398:\trc = nfc_digital_register_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/nfcsim.c-399-\tif (rc) {\ndrivers/nfc/nfcsim.c-400-\t\tpr_err(\"Could not register digital device (%d)\\n\", rc);\ndrivers/nfc/nfcsim.c:401:\t\tnfc_digital_free_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/nfcsim.c-402-\t\tkfree(dev);\n--\ndrivers/nfc/nfcsim.c=412=static void nfcsim_device_free(struct nfcsim dev)\ndrivers/nfc/nfcsim.c-413-{\ndrivers/nfc/nfcsim.c:414:\tnfc_digital_unregister_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/nfcsim.c-415-\n--\ndrivers/nfc/nfcsim.c-422-\ndrivers/nfc/nfcsim.c:423:\tnfc_digital_free_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/nfcsim.c-424-\n--\ndrivers/nfc/port100.c=439=struct port100 {\ndrivers/nfc/port100.c:440:\tstruct nfc_digital_dev nfc_digital_dev;\ndrivers/nfc/port100.c-441-\n--\ndrivers/nfc/port100.c=931=static void port100_send_complete(struct urb urb)\n--\ndrivers/nfc/port100.c-954-\ndrivers/nfc/port100.c:955:static void port100_abort_cmd(struct nfc_digital_dev ddev)\ndrivers/nfc/port100.c-956-{\n--\ndrivers/nfc/port100.c=1025=static u16 port100_get_firmware_version(struct port100 dev)\n--\ndrivers/nfc/port100.c-1046-\ndrivers/nfc/port100.c:1047:static int port100_switch_rf(struct nfc_digital_dev ddev, bool on)\ndrivers/nfc/port100.c-1048-{\n--\ndrivers/nfc/port100.c-1071-\ndrivers/nfc/port100.c:1072:static int port100_in_set_rf(struct nfc_digital_dev ddev, u8 rf)\ndrivers/nfc/port100.c-1073-{\n--\ndrivers/nfc/port100.c-1100-\ndrivers/nfc/port100.c:1101:static int port100_in_set_framing(struct nfc_digital_dev ddev, int param)\ndrivers/nfc/port100.c-1102-{\n--\ndrivers/nfc/port100.c-1142-\ndrivers/nfc/port100.c:1143:static int port100_in_configure_hw(struct nfc_digital_dev ddev, int type,\ndrivers/nfc/port100.c-1144-\t\t\t\t int param)\n--\ndrivers/nfc/port100.c=1155=static void port100_in_comm_rf_complete(struct port100 dev, void arg,\n--\ndrivers/nfc/port100.c-1200-exit:\ndrivers/nfc/port100.c:1201:\tcb(dev-\u003enfc_digital_dev, cb_arg-\u003ecomplete_arg, resp);\ndrivers/nfc/port100.c-1202-\n--\ndrivers/nfc/port100.c-1205-\ndrivers/nfc/port100.c:1206:static int port100_in_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/port100.c-1207-\t\t\t struct sk_buff skb, u16 _timeout,\n--\ndrivers/nfc/port100.c-1228-\ndrivers/nfc/port100.c:1229:static int port100_tg_set_rf(struct nfc_digital_dev ddev, u8 rf)\ndrivers/nfc/port100.c-1230-{\n--\ndrivers/nfc/port100.c-1257-\ndrivers/nfc/port100.c:1258:static int port100_tg_set_framing(struct nfc_digital_dev ddev, int param)\ndrivers/nfc/port100.c-1259-{\n--\ndrivers/nfc/port100.c-1299-\ndrivers/nfc/port100.c:1300:static int port100_tg_configure_hw(struct nfc_digital_dev ddev, int type,\ndrivers/nfc/port100.c-1301-\t\t\t\t int param)\n--\ndrivers/nfc/port100.c=1332=static void port100_tg_comm_rf_complete(struct port100 dev, void arg,\n--\ndrivers/nfc/port100.c-1366-exit:\ndrivers/nfc/port100.c:1367:\tcb(dev-\u003enfc_digital_dev, cb_arg-\u003ecomplete_arg, resp);\ndrivers/nfc/port100.c-1368-\n--\ndrivers/nfc/port100.c-1371-\ndrivers/nfc/port100.c:1372:static int port100_tg_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/port100.c-1373-\t\t\t struct sk_buff skb, u16 timeout,\n--\ndrivers/nfc/port100.c-1399-\ndrivers/nfc/port100.c:1400:static int port100_listen_mdaa(struct nfc_digital_dev ddev,\ndrivers/nfc/port100.c-1401-\t\t\t struct digital_tg_mdaa_params params,\n--\ndrivers/nfc/port100.c-1455-\ndrivers/nfc/port100.c:1456:static int port100_listen(struct nfc_digital_dev ddev, u16 timeout,\ndrivers/nfc/port100.c-1457-\t\t\t nfc_digital_cmd_complete_t cb, void arg)\n--\ndrivers/nfc/port100.c=1489=static int port100_probe(struct usb_interface interface,\n--\ndrivers/nfc/port100.c-1571-\ndrivers/nfc/port100.c:1572:\tdev-\u003enfc_digital_dev = nfc_digital_allocate_device(\u0026port100_digital_ops,\ndrivers/nfc/port100.c-1573-\t\t\t\t\t\t\t PORT100_PROTOCOLS,\n--\ndrivers/nfc/port100.c-1576-\t\t\t\t\t\t\t dev-\u003eskb_tailroom);\ndrivers/nfc/port100.c:1577:\tif (!dev-\u003enfc_digital_dev) {\ndrivers/nfc/port100.c-1578-\t\tnfc_err(\u0026interface-\u003edev,\ndrivers/nfc/port100.c:1579:\t\t\t\"Could not allocate nfc_digital_dev\\n\");\ndrivers/nfc/port100.c-1580-\t\trc = -ENOMEM;\n--\ndrivers/nfc/port100.c-1583-\ndrivers/nfc/port100.c:1584:\tnfc_digital_set_parent_dev(dev-\u003enfc_digital_dev, \u0026interface-\u003edev);\ndrivers/nfc/port100.c:1585:\tnfc_digital_set_drvdata(dev-\u003enfc_digital_dev, dev);\ndrivers/nfc/port100.c-1586-\ndrivers/nfc/port100.c:1587:\trc = nfc_digital_register_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/port100.c-1588-\tif (rc) {\n--\ndrivers/nfc/port100.c-1596-free_nfc_dev:\ndrivers/nfc/port100.c:1597:\tnfc_digital_free_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/port100.c-1598-\n--\ndrivers/nfc/port100.c=1608=static void port100_disconnect(struct usb_interface interface)\n--\ndrivers/nfc/port100.c-1614-\ndrivers/nfc/port100.c:1615:\tnfc_digital_unregister_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/port100.c:1616:\tnfc_digital_free_device(dev-\u003enfc_digital_dev);\ndrivers/nfc/port100.c-1617-\n--\ndrivers/nfc/st95hf/core.c=217=struct st95hf_context {\ndrivers/nfc/st95hf/core.c-218-\tstruct st95hf_spi_context spicontext;\ndrivers/nfc/st95hf/core.c:219:\tstruct nfc_digital_dev ddev;\ndrivers/nfc/st95hf/core.c-220-\tstruct nfc_dev nfcdev;\n--\ndrivers/nfc/st95hf/core.c=531=static int iso14443_config_fdt(struct st95hf_context st95context, int wtxm)\n--\ndrivers/nfc/st95hf/core.c-534-\tstruct device dev = \u0026st95context-\u003espicontext.spidev-\u003edev;\ndrivers/nfc/st95hf/core.c:535:\tstruct nfc_digital_dev nfcddev = st95context-\u003eddev;\ndrivers/nfc/st95hf/core.c-536-\tunsigned char pp_typeb;\n--\ndrivers/nfc/st95hf/core.c=602=static int st95hf_handle_wtx(struct st95hf_context stcontext,\n--\ndrivers/nfc/st95hf/core.c-608-\tstruct param_list new_params[1];\ndrivers/nfc/st95hf/core.c:609:\tstruct nfc_digital_dev nfcddev = stcontext-\u003eddev;\ndrivers/nfc/st95hf/core.c-610-\tstruct device dev = \u0026stcontext-\u003enfcdev-\u003edev;\n--\ndrivers/nfc/st95hf/core.c=693=static int st95hf_response_handler(struct st95hf_context stcontext,\n--\ndrivers/nfc/st95hf/core.c-699-\tunsigned char val_mm;\ndrivers/nfc/st95hf/core.c:700:\tstruct nfc_digital_dev nfcddev = stcontext-\u003eddev;\ndrivers/nfc/st95hf/core.c-701-\tstruct device dev = \u0026stcontext-\u003enfcdev-\u003edev;\n--\ndrivers/nfc/st95hf/core.c=766=static irqreturn_t st95hf_irq_thread_handler(int irq, void st95hfcontext)\n--\ndrivers/nfc/st95hf/core.c-868-/* NFC ops functions definition /\ndrivers/nfc/st95hf/core.c:869:static int st95hf_in_configure_hw(struct nfc_digital_dev ddev,\ndrivers/nfc/st95hf/core.c-870-\t\t\t\t int type,\n--\ndrivers/nfc/st95hf/core.c=901=static int rf_off(struct st95hf_context stcontext)\n--\ndrivers/nfc/st95hf/core.c-914-\ndrivers/nfc/st95hf/core.c:915:static int st95hf_in_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/st95hf/core.c-916-\t\t\t struct sk_buff skb,\n--\ndrivers/nfc/st95hf/core.c-988-/ p2p will be supported in a later release ! /\ndrivers/nfc/st95hf/core.c:989:static int st95hf_tg_configure_hw(struct nfc_digital_dev ddev,\ndrivers/nfc/st95hf/core.c-990-\t\t\t\t int type,\n--\ndrivers/nfc/st95hf/core.c-995-\ndrivers/nfc/st95hf/core.c:996:static int st95hf_tg_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/st95hf/core.c-997-\t\t\t struct sk_buff skb,\n--\ndrivers/nfc/st95hf/core.c-1004-\ndrivers/nfc/st95hf/core.c:1005:static int st95hf_tg_listen(struct nfc_digital_dev ddev,\ndrivers/nfc/st95hf/core.c-1006-\t\t\t u16 timeout,\n--\ndrivers/nfc/st95hf/core.c-1012-\ndrivers/nfc/st95hf/core.c:1013:static int st95hf_tg_get_rf_tech(struct nfc_digital_dev ddev, u8 rf_tech)\ndrivers/nfc/st95hf/core.c-1014-{\n--\ndrivers/nfc/st95hf/core.c-1017-\ndrivers/nfc/st95hf/core.c:1018:static int st95hf_switch_rf(struct nfc_digital_dev ddev, bool on)\ndrivers/nfc/st95hf/core.c-1019-{\n--\ndrivers/nfc/st95hf/core.c-1033-/* TODO st95hf_abort_cmd /\ndrivers/nfc/st95hf/core.c:1034:static void st95hf_abort_cmd(struct nfc_digital_dev ddev)\ndrivers/nfc/st95hf/core.c-1035-{\n--\ndrivers/nfc/trf7970a.c=430=struct trf7970a {\n--\ndrivers/nfc/trf7970a.c-435-\tstruct regulator\t\tvddio_regulator;\ndrivers/nfc/trf7970a.c:436:\tstruct nfc_digital_dev\t\tddev;\ndrivers/nfc/trf7970a.c-437-\tu32\t\t\t\tquirks;\n--\ndrivers/nfc/trf7970a.c=1147=static int trf7970a_switch_rf_on(struct trf7970a trf)\n--\ndrivers/nfc/trf7970a.c-1171-\ndrivers/nfc/trf7970a.c:1172:static int trf7970a_switch_rf(struct nfc_digital_dev ddev, bool on)\ndrivers/nfc/trf7970a.c-1173-{\n--\ndrivers/nfc/trf7970a.c=1312=static int trf7970a_in_config_framing(struct trf7970a trf, int framing)\n--\ndrivers/nfc/trf7970a.c-1386-\ndrivers/nfc/trf7970a.c:1387:static int trf7970a_in_configure_hw(struct nfc_digital_dev ddev, int type,\ndrivers/nfc/trf7970a.c-1388-\t\t\t\t int param)\n--\ndrivers/nfc/trf7970a.c=1439=static int trf7970a_per_cmd_config(struct trf7970a trf,\n--\ndrivers/nfc/trf7970a.c-1507-\ndrivers/nfc/trf7970a.c:1508:static int trf7970a_send_cmd(struct nfc_digital_dev ddev,\ndrivers/nfc/trf7970a.c-1509-\t\t\t struct sk_buff skb, u16 timeout,\n--\ndrivers/nfc/trf7970a.c=1670=static int trf7970a_tg_config_framing(struct trf7970a trf, int framing)\n--\ndrivers/nfc/trf7970a.c-1728-\ndrivers/nfc/trf7970a.c:1729:static int trf7970a_tg_configure_hw(struct nfc_digital_dev ddev, int type,\ndrivers/nfc/trf7970a.c-1730-\t\t\t\t int param)\n--\ndrivers/nfc/trf7970a.c-1764-\ndrivers/nfc/trf7970a.c:1765:static int _trf7970a_tg_listen(struct nfc_digital_dev ddev, u16 timeout,\ndrivers/nfc/trf7970a.c-1766-\t\t\t nfc_digital_cmd_complete_t cb, void arg,\n--\ndrivers/nfc/trf7970a.c-1843-\ndrivers/nfc/trf7970a.c:1844:static int trf7970a_tg_listen(struct nfc_digital_dev ddev, u16 timeout,\ndrivers/nfc/trf7970a.c-1845-\t\t\t nfc_digital_cmd_complete_t cb, void arg)\n--\ndrivers/nfc/trf7970a.c-1854-\ndrivers/nfc/trf7970a.c:1855:static int trf7970a_tg_listen_md(struct nfc_digital_dev ddev,\ndrivers/nfc/trf7970a.c-1856-\t\t\t\t u16 timeout, nfc_digital_cmd_complete_t cb,\n--\ndrivers/nfc/trf7970a.c-1877-\ndrivers/nfc/trf7970a.c:1878:static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev ddev, u8 rf_tech)\ndrivers/nfc/trf7970a.c-1879-{\n--\ndrivers/nfc/trf7970a.c-1889-\ndrivers/nfc/trf7970a.c:1890:static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)\ndrivers/nfc/trf7970a.c-1891-{\n" }
7/2	2026/09/12 13:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 11676 output: 33 thoughts: 102 Thoughts: My Initial Thoughts on NFC Driver Investigation Okay, so I've spotted `port100`. Right, that's a USB NFC driver. Good. I see its probe function, `port100_probe`. That's the entry point to how it handles its functionality. Immediately, I'm thinking about emulation strategies. USB drivers are often ripe for fuzzing, and I know that syzkaller has that raw gadget setup, the `dummy_hcd` and `raw_gadget` stuff. That could be a direct line to manipulate the driver without needing actual hardware. I should probably also consider interacting with or even creating an `nfcsim` instance as another avenue for testing. Furthermore, my mind jumps to investigating how the driver's inner workings are used. I need to understand the data flow, and specifically, I'm curious about the function `digital_tg_recv_dep_req`. How is this function actually used? What are the calling contexts? Let's trace back the callers of this function. Understanding its interaction with the driver will give me a better grasp of the potential attack surface.
8/2	2026/09/12 13:23	tool	grepper	0m Args: { "Expression": "digital_tg_recv_dep_req", "PathPrefix": "net/nfc" } Results: { "Output": "net/nfc/digital_dep.c=106=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-107-\t\t\t\t struct sk_buff resp);\nnet/nfc/digital_dep.c:108:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-109-\t\t\t\t struct sk_buff resp);\n--\nnet/nfc/digital_dep.c=978=static int digital_tg_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1012-\nnet/nfc/digital_dep.c:1013:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1014-\t\t\t\t data_exch);\n--\nnet/nfc/digital_dep.c=1024=static int digital_tg_send_atn(struct nfc_digital_dev ddev)\n--\nnet/nfc/digital_dep.c-1051-\nnet/nfc/digital_dep.c:1052:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1053-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c=1060=static int digital_tg_send_saved_skb(struct nfc_digital_dev ddev)\n--\nnet/nfc/digital_dep.c-1069-\trc = digital_tg_send_cmd(ddev, ddev-\u003esaved_skb, 1500,\nnet/nfc/digital_dep.c:1070:\t\t\t\t digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1071-\tif (rc)\n--\nnet/nfc/digital_dep.c-1076-\nnet/nfc/digital_dep.c:1077:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-1078-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_dep.c=1297=int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\n--\nnet/nfc/digital_dep.c-1331-\nnet/nfc/digital_dep.c:1332:\trc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1333-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c=1348=static void digital_tg_send_psl_res_complete(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1359-\nnet/nfc/digital_dep.c:1360:\tdigital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1361-\n--\nnet/nfc/digital_dep.c=1467=static void digital_tg_send_atr_res_complete(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1485-\telse\nnet/nfc/digital_dep.c:1486:\t\tdigital_tg_recv_dep_req(ddev, arg, resp);\nnet/nfc/digital_dep.c-1487-}\n" }
9/2	2026/09/12 13:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 13073 output: 32 thoughts: 308 Thoughts: Analyzing the Patch: NFC DID Handling Okay, let's break this down. My initial instinct is to understand the core logic of this patch. It appears to be related to handling the Device ID (DID) field within the NFC Digital DEP protocol. I'm focusing on the changes made to the `pfb` variable and the conditional logic surrounding the `ddev->did` check. Looking at the original code and the patch side-by-side really helps. In the original, it seems there's an explicit check: if a DID bit is set, and if `ddev->did` exists and matches `resp->data[3]`, then the size is incremented. The patch seems to be updating how this size increment and error condition is handled. The new code has some conditions: 1. `resp->len < size + 1`: checks if the response is big enough 2. `!ddev->did`: checks if there is no `ddev->did` 3. `ddev->did != resp->data[size]`: compares `ddev->did` to what's in the response data I'm starting to get it. The patch tightens the error conditions to prevent a potential buffer underflow or incorrect DID comparison. The important bit is to check the `resp->len` field. Also, the patch appears to simplify the logic by combining the existence and the comparison of `ddev->did`. Wait, back up. I need to be absolutely sure about that indexing. Let's look up `sizeof(struct digital_dep_req_res)`. I need to understand what this structure looks like to know the offsets and where the DID is expected to reside in the buffer. That `size` variable is a critical piece of the puzzle here, and the changes to the original `if` statements depends on it!
10/2	2026/09/12 13:24	tool	grepper	0m Args: { "Expression": "struct digital_dep_req_res", "PathPrefix": "net/nfc" } Results: { "Output": "net/nfc/digital_dep.c=94=struct digital_psl_res {\n--\nnet/nfc/digital_dep.c-99-\nnet/nfc/digital_dep.c:100:struct digital_dep_req_res {\nnet/nfc/digital_dep.c-101-\tu8 dir;\n--\nnet/nfc/digital_dep.c=200=digital_send_dep_data_prep(struct nfc_digital_dev ddev, struct sk_buff skb,\nnet/nfc/digital_dep.c:201:\t\t\t struct digital_dep_req_res dep_req_res,\nnet/nfc/digital_dep.c-202-\t\t\t struct digital_data_exch data_exch)\n--\nnet/nfc/digital_dep.c=529=static int digital_in_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-531-{\nnet/nfc/digital_dep.c:532:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-533-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-539-\nnet/nfc/digital_dep.c:540:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-541-\nnet/nfc/digital_dep.c:542:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-543-\n--\nnet/nfc/digital_dep.c=566=static int digital_in_send_nack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-568-{\nnet/nfc/digital_dep.c:569:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-570-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-576-\nnet/nfc/digital_dep.c:577:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-578-\nnet/nfc/digital_dep.c:579:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-580-\n--\nnet/nfc/digital_dep.c=598=static int digital_in_send_atn(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-600-{\nnet/nfc/digital_dep.c:601:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-602-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-608-\nnet/nfc/digital_dep.c:609:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-610-\nnet/nfc/digital_dep.c:611:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-612-\n--\nnet/nfc/digital_dep.c=629=static int digital_in_send_rtox(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-631-{\nnet/nfc/digital_dep.c:632:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-633-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-646-\nnet/nfc/digital_dep.c:647:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-648-\nnet/nfc/digital_dep.c:649:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-650-\n--\nnet/nfc/digital_dep.c=686=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\n--\nnet/nfc/digital_dep.c-689-\tstruct digital_data_exch data_exch = arg;\nnet/nfc/digital_dep.c:690:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-691-\tu8 pfb;\n--\nnet/nfc/digital_dep.c-755-\nnet/nfc/digital_dep.c:756:\tsize = sizeof(struct digital_dep_req_res);\nnet/nfc/digital_dep.c:757:\tdep_res = (struct digital_dep_req_res )resp-\u003edata;\nnet/nfc/digital_dep.c-758-\n--\nnet/nfc/digital_dep.c=904=int digital_in_send_dep_req(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-907-{\nnet/nfc/digital_dep.c:908:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-909-\tstruct sk_buff chaining_skb, tmp_skb;\n--\nnet/nfc/digital_dep.c-911-\nnet/nfc/digital_dep.c:912:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-913-\nnet/nfc/digital_dep.c:914:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-915-\n--\nnet/nfc/digital_dep.c=978=static int digital_tg_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-980-{\nnet/nfc/digital_dep.c:981:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-982-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-988-\nnet/nfc/digital_dep.c:989:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-990-\nnet/nfc/digital_dep.c:991:\tdep_res = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-992-\n--\nnet/nfc/digital_dep.c=1024=static int digital_tg_send_atn(struct nfc_digital_dev ddev)\nnet/nfc/digital_dep.c-1025-{\nnet/nfc/digital_dep.c:1026:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-1027-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-1033-\nnet/nfc/digital_dep.c:1034:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-1035-\nnet/nfc/digital_dep.c:1036:\tdep_res = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-1037-\n--\nnet/nfc/digital_dep.c=1077=static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\n--\nnet/nfc/digital_dep.c-1080-\tint rc;\nnet/nfc/digital_dep.c:1081:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-1082-\tu8 pfb;\n--\nnet/nfc/digital_dep.c-1107-\nnet/nfc/digital_dep.c:1108:\tsize = sizeof(struct digital_dep_req_res);\nnet/nfc/digital_dep.c:1109:\tdep_req = (struct digital_dep_req_res )resp-\u003edata;\nnet/nfc/digital_dep.c-1110-\n--\nnet/nfc/digital_dep.c=1297=int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\nnet/nfc/digital_dep.c-1298-{\nnet/nfc/digital_dep.c:1299:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-1300-\tstruct sk_buff chaining_skb, tmp_skb;\n--\nnet/nfc/digital_dep.c-1302-\nnet/nfc/digital_dep.c:1303:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-1304-\nnet/nfc/digital_dep.c:1305:\tdep_res = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-1306-\n" }
11/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 16389 output: 37 thoughts: 17 Thoughts: Here's my take on those thoughts: Peering into the Depths of `struct digital_dep_req_res` Alright, let's get down to brass tacks. I need to understand this `struct digital_dep_req_res`. It's crucial for my current analysis, so I have to make sure I have a solid understanding of this. Let's delve into its definition and meticulously parse its components. From the way this is named, I assume it's involved in digital dependency request and response; I'll see if that's accurate as I review it. Any insight I can get from its definition will be invaluable. Time to meticulously dissect this structure.
12/2	2026/09/12 13:24	tool	read-file	0m Args: { "File": "net/nfc/digital_dep.c", "FirstLine": 95, "LineCount": 20 } Results: { "Contents": " 95:\t\tu8 dir;\n 96:\t\tu8 cmd;\n 97:\t\tu8 did;\n 98:\t} __packed;\n 99:\t\n 100:\tstruct digital_dep_req_res {\n 101:\t\tu8 dir;\n 102:\t\tu8 cmd;\n 103:\t\tu8 pfb;\n 104:\t} __packed;\n 105:\t\n 106:\tstatic void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\n 107:\t\t\t\t\t struct sk_buff resp);\n 108:\tstatic void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\n 109:\t\t\t\t\t struct sk_buff resp);\n 110:\t\n 111:\tstatic const u8 digital_payload_bits_map[4] = {\n 112:\t\t[0] = 64,\n 113:\t\t[1] = 128,\n 114:\t\t[2] = 192,\n" }
13/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 16892 output: 38 thoughts: 264 Thoughts: My Analysis of the Digital NFC DEP Request/Response Vulnerability Okay, so I'm looking at this `digital_dep_req_res` struct – it's just 3 bytes: dir, cmd, and pfb. That's straightforward. Which means the initial `size` is set to 3 – makes perfect sense, using `sizeof(struct digital_dep_req_res)`. Now, before the patch was applied, things were a bit… sloppy. The code was doing this: `ddev->did == resp->data[3]`. The problem? `resp->data[3]` accesses the fourth byte, that's index 3. But here's the kicker, the check was: `if (resp->len < size \|\| ...)` where `size` was still that initial 3. So, if `resp->len` was exactly 3 and the `DIGITAL_NFC_DEP_DID_BIT_SET(pfb)` condition was true, we'd hit that OOB read. We'd be reading one byte past the allocated memory for `resp->data` – that's a classic buffer over-read situation. Not good. The patch fixes this by making the length check more robust. It's now checking `if (resp->len < size + 1 \|\| !ddev->did \|\| ddev->did != resp->data[size])` first, then incrementing `size`. That `size + 1` is critical – it ensures we have enough space before that comparison with `resp->data[size]`. A simple fix, but a necessary one to prevent the out-of-bounds read. It's similar to how it was done earlier in `digital_in_recv_dep_res` around line 755 in the source code; I should probably keep that as a template next time.
14/2	2026/09/12 13:24	tool	read-file	0m Args: { "File": "net/nfc/digital_dep.c", "FirstLine": 755, "LineCount": 35 } Results: { "Contents": " 755:\t\n 756:\t\tsize = sizeof(struct digital_dep_req_res);\n 757:\t\tdep_res = (struct digital_dep_req_res *)resp-\u003edata;\n 758:\t\n 759:\t\tif (resp-\u003elen \u003c size \|\| dep_res-\u003edir != DIGITAL_NFC_DEP_FRAME_DIR_IN \|\|\n 760:\t\t dep_res-\u003ecmd != DIGITAL_CMD_DEP_RES) {\n 761:\t\t\trc = -EIO;\n 762:\t\t\tgoto error;\n 763:\t\t}\n 764:\t\n 765:\t\tpfb = dep_res-\u003epfb;\n 766:\t\n 767:\t\tif (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {\n 768:\t\t\tPROTOCOL_ERR(\"14.8.2.1\");\n 769:\t\t\trc = -EIO;\n 770:\t\t\tgoto error;\n 771:\t\t}\n 772:\t\n 773:\t\tif (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {\n 774:\t\t\trc = -EIO;\n 775:\t\t\tgoto exit;\n 776:\t\t}\n 777:\t\n 778:\t\tif (size \u003e resp-\u003elen) {\n 779:\t\t\trc = -EIO;\n 780:\t\t\tgoto error;\n 781:\t\t}\n 782:\t\n 783:\t\tskb_pull(resp, size);\n 784:\t\n 785:\t\tswitch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {\n 786:\t\tcase DIGITAL_NFC_DEP_PFB_I_PDU:\n 787:\t\t\tif (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev-\u003ecurr_nfc_dep_pni) {\n 788:\t\t\t\tPROTOCOL_ERR(\"14.12.3.3\");\n 789:\t\t\t\trc = -EIO;\n" }
15/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18145 output: 27 thoughts: 21 Thoughts: Here's my take on the process, presented as a first-person account assuming expertise in the field: Diving into the `net/nfc/digital_dep.c` Kconfig Options Alright, time to get into the nitty-gritty. I'm focusing on `net/nfc/digital_dep.c` now and need to refresh my memory on which Kconfig options govern its compilation. I'm thinking I'll start by quickly scanning the relevant Kconfig files. Probably within the `net/nfc/` directory and potentially upstream ones, to ensure I haven't missed any dependencies that could affect this specific module. It's crucial to identify the relevant dependencies as these Kconfig options not only control if the source file is compiled into the kernel but also which sub-features of the module are active or not, or even if it depends on a specific hardware configuration. I'll be looking for things like flags tied to specific NFC controllers, any feature switches related to digital protocol negotiation, or perhaps conditional compilation based on the presence of certain hardware features. Understanding the Kconfig structure here is fundamental to understanding this module. It's a quick but essential step to ensure this module works as intended, and can be configured correctly, given different target hardware and use cases.
16/2	2026/09/12 13:24	tool	grepper	0m Args: { "Expression": "digital_dep", "PathPrefix": "net/nfc" } Results: { "Output": "net/nfc/Makefile=11=nfc-objs := core.o netlink.o af_nfc.o rawsock.o llcp_core.o llcp_commands.o \\\n--\nnet/nfc/Makefile-13-\nnet/nfc/Makefile:14:nfc_digital-objs := digital_core.o digital_technology.o digital_dep.o\n--\nnet/nfc/digital_core.c=586=static int digital_dev_down(struct nfc_dev nfc_dev)\n--\nnet/nfc/digital_core.c-594-\nnet/nfc/digital_core.c:595:static int digital_dep_link_up(struct nfc_dev nfc_dev,\nnet/nfc/digital_core.c-596-\t\t\t struct nfc_target target,\n--\nnet/nfc/digital_core.c-609-\nnet/nfc/digital_core.c:610:static int digital_dep_link_down(struct nfc_dev nfc_dev)\nnet/nfc/digital_core.c-611-{\n--\nnet/nfc/digital_core.c=744=static const struct nfc_ops digital_nfc_ops = {\n--\nnet/nfc/digital_core.c-748-\t.stop_poll = digital_stop_poll,\nnet/nfc/digital_core.c:749:\t.dep_link_up = digital_dep_link_up,\nnet/nfc/digital_core.c:750:\t.dep_link_down = digital_dep_link_down,\nnet/nfc/digital_core.c-751-\t.activate_target = digital_activate_target,\n--\nnet/nfc/digital_dep.c=94=struct digital_psl_res {\n--\nnet/nfc/digital_dep.c-99-\nnet/nfc/digital_dep.c:100:struct digital_dep_req_res {\nnet/nfc/digital_dep.c-101-\tu8 dir;\n--\nnet/nfc/digital_dep.c=200=digital_send_dep_data_prep(struct nfc_digital_dev ddev, struct sk_buff skb,\nnet/nfc/digital_dep.c:201:\t\t\t struct digital_dep_req_res dep_req_res,\nnet/nfc/digital_dep.c-202-\t\t\t struct digital_data_exch data_exch)\n--\nnet/nfc/digital_dep.c=529=static int digital_in_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-531-{\nnet/nfc/digital_dep.c:532:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-533-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-539-\nnet/nfc/digital_dep.c:540:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-541-\nnet/nfc/digital_dep.c:542:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-543-\n--\nnet/nfc/digital_dep.c=566=static int digital_in_send_nack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-568-{\nnet/nfc/digital_dep.c:569:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-570-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-576-\nnet/nfc/digital_dep.c:577:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-578-\nnet/nfc/digital_dep.c:579:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-580-\n--\nnet/nfc/digital_dep.c=598=static int digital_in_send_atn(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-600-{\nnet/nfc/digital_dep.c:601:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-602-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-608-\nnet/nfc/digital_dep.c:609:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-610-\nnet/nfc/digital_dep.c:611:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-612-\n--\nnet/nfc/digital_dep.c=629=static int digital_in_send_rtox(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-631-{\nnet/nfc/digital_dep.c:632:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-633-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-646-\nnet/nfc/digital_dep.c:647:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-648-\nnet/nfc/digital_dep.c:649:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-650-\n--\nnet/nfc/digital_dep.c=686=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\n--\nnet/nfc/digital_dep.c-689-\tstruct digital_data_exch data_exch = arg;\nnet/nfc/digital_dep.c:690:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-691-\tu8 pfb;\n--\nnet/nfc/digital_dep.c-755-\nnet/nfc/digital_dep.c:756:\tsize = sizeof(struct digital_dep_req_res);\nnet/nfc/digital_dep.c:757:\tdep_res = (struct digital_dep_req_res )resp-\u003edata;\nnet/nfc/digital_dep.c-758-\n--\nnet/nfc/digital_dep.c=904=int digital_in_send_dep_req(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-907-{\nnet/nfc/digital_dep.c:908:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-909-\tstruct sk_buff chaining_skb, tmp_skb;\n--\nnet/nfc/digital_dep.c-911-\nnet/nfc/digital_dep.c:912:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-913-\nnet/nfc/digital_dep.c:914:\tdep_req = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-915-\n--\nnet/nfc/digital_dep.c=978=static int digital_tg_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-980-{\nnet/nfc/digital_dep.c:981:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-982-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-988-\nnet/nfc/digital_dep.c:989:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-990-\nnet/nfc/digital_dep.c:991:\tdep_res = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-992-\n--\nnet/nfc/digital_dep.c=1024=static int digital_tg_send_atn(struct nfc_digital_dev ddev)\nnet/nfc/digital_dep.c-1025-{\nnet/nfc/digital_dep.c:1026:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-1027-\tstruct sk_buff skb;\n--\nnet/nfc/digital_dep.c-1033-\nnet/nfc/digital_dep.c:1034:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-1035-\nnet/nfc/digital_dep.c:1036:\tdep_res = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-1037-\n--\nnet/nfc/digital_dep.c=1077=static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\n--\nnet/nfc/digital_dep.c-1080-\tint rc;\nnet/nfc/digital_dep.c:1081:\tstruct digital_dep_req_res dep_req;\nnet/nfc/digital_dep.c-1082-\tu8 pfb;\n--\nnet/nfc/digital_dep.c-1107-\nnet/nfc/digital_dep.c:1108:\tsize = sizeof(struct digital_dep_req_res);\nnet/nfc/digital_dep.c:1109:\tdep_req = (struct digital_dep_req_res )resp-\u003edata;\nnet/nfc/digital_dep.c-1110-\n--\nnet/nfc/digital_dep.c=1297=int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\nnet/nfc/digital_dep.c-1298-{\nnet/nfc/digital_dep.c:1299:\tstruct digital_dep_req_res dep_res;\nnet/nfc/digital_dep.c-1300-\tstruct sk_buff chaining_skb, tmp_skb;\n--\nnet/nfc/digital_dep.c-1302-\nnet/nfc/digital_dep.c:1303:\tskb_push(skb, sizeof(struct digital_dep_req_res));\nnet/nfc/digital_dep.c-1304-\nnet/nfc/digital_dep.c:1305:\tdep_res = (struct digital_dep_req_res )skb-\u003edata;\nnet/nfc/digital_dep.c-1306-\n" }
17/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21483 output: 32 thoughts: 23 Thoughts: Here's my take on those thoughts: Investigating the NFC Digital Configuration Okay, so I need to figure out what's triggering the `nfc_digital` component within the NFC system. The logical starting point is the `net/nfc/Makefile`. It's where the build configuration lives. That's where I need to dig in to find the specific config options that govern the inclusion of `nfc_digital`. Hopefully, it's a straightforward dependency chain. I'll probably be looking for an `ifdef` or a similar conditional statement that checks for some Kconfig symbol. Time to see what the build process has to say. I'm hoping it's well-documented!
18/2	2026/09/12 13:24	tool	read-file	0m Args: { "File": "net/nfc/Makefile", "FirstLine": 1, "LineCount": 25 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\t#\n 3:\t# Makefile for the Linux NFC subsystem.\n 4:\t#\n 5:\t\n 6:\tobj-$(CONFIG_NFC) += nfc.o\n 7:\tobj-$(CONFIG_NFC_NCI) += nci/\n 8:\tobj-$(CONFIG_NFC_HCI) += hci/\n 9:\tobj-$(CONFIG_NFC_DIGITAL) += nfc_digital.o\n 10:\t\n 11:\tnfc-objs := core.o netlink.o af_nfc.o rawsock.o llcp_core.o llcp_commands.o \\\n 12:\t\t\tllcp_sock.o\n 13:\t\n 14:\tnfc_digital-objs := digital_core.o digital_technology.o digital_dep.o\n" }
19/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21922 output: 29 thoughts: 44 Thoughts: Examining the NFC Digital Driver Build Configuration Okay, so I see this line: `obj-$(CONFIG_NFC_DIGITAL) += nfc_digital.o`. My brain immediately translates this to: "The `nfc_digital.o` object file will be included in the build, but only if the `CONFIG_NFC_DIGITAL` kernel configuration option is enabled." I need to understand the dependencies on `NFC_DIGITAL`. Where is that defined? It is probably defined in `net/nfc/Kconfig`. Let's check there to see what it depends on. I'll need to know this information to understand if and when the driver will be built.
20/2	2026/09/12 13:24	tool	grepper	0m Args: { "Expression": "config NFC_DIGITAL", "PathPrefix": "net/nfc" } Results: { "Output": "net/nfc/Kconfig=6=menuconfig NFC\n--\nnet/nfc/Kconfig-16-\nnet/nfc/Kconfig:17:config NFC_DIGITAL\nnet/nfc/Kconfig-18-\tdepends on NFC\n" }
21/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22217 output: 33 thoughts: 19 Thoughts: Here's my take on those thoughts, tailored for an expert like yourself: Diving into the `net/nfc/Kconfig` File Alright, let's take a quick look at `net/nfc/Kconfig`, specifically around line 17. My mental model, based on previous interactions with the NFC subsystem, is suggesting something in that area. It's likely a configuration option or dependency definition, perhaps related to a feature flag, a hardware driver, or a general enabling/disabling of a core NFC component. I'm immediately expecting to see either a `config` statement, a `depends on` clause, or maybe even an `if` statement controlling the inclusion of other Kconfig fragments. Given the position in the file, it's probably not a top-level symbol, and might be nested under another option. I'm prepared to quickly scan for keywords like "NFC", "PN532", "HAL", or potentially, a module name I recognize. My intention is to immediately identify the scope of what the Kconfig controls, its dependencies, and any implications it has for the build configuration. I'm trying to get a quick map of what's there to help me formulate my next step in this investigation.
22/2	2026/09/12 13:24	tool	read-file	0m Args: { "File": "net/nfc/Kconfig", "FirstLine": 1, "LineCount": 35 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t#\n 3:\t# NFC subsystem configuration\n 4:\t#\n 5:\t\n 6:\tmenuconfig NFC\n 7:\t\tdepends on RFKILL \|\| !RFKILL\n 8:\t\ttristate \"NFC subsystem support\"\n 9:\t\tdefault n\n 10:\t\thelp\n 11:\t\t Say Y here if you want to build support for NFC (Near field\n 12:\t\t communication) devices.\n 13:\t\n 14:\t\t To compile this support as a module, choose M here: the module will\n 15:\t\t be called nfc.\n 16:\t\n 17:\tconfig NFC_DIGITAL\n 18:\t\tdepends on NFC\n 19:\t\tselect CRC_CCITT\n 20:\t\tselect CRC_ITU_T\n 21:\t\ttristate \"NFC Digital Protocol stack support\"\n 22:\t\tdefault n\n 23:\t\thelp\n 24:\t\t Say Y if you want to build NFC digital protocol stack support.\n 25:\t\t This is needed by NFC chipsets whose firmware only implement\n 26:\t\t the NFC analog layer.\n 27:\t\n 28:\t\t To compile this support as a module, choose M here: the module will\n 29:\t\t be called nfc_digital.\n 30:\t\n 31:\tsource \"net/nfc/nci/Kconfig\"\n 32:\tsource \"net/nfc/hci/Kconfig\"\n 33:\t\n 34:\tsource \"drivers/nfc/Kconfig\"\n" }
23/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22953 output: 29 thoughts: 17 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: Analyzing NFC_DIGITAL Driver Dependencies Alright, let's dive in. My immediate thought is, "What specifically are these drivers doing, and what other components are they tightly coupled with?" I need to understand the ecosystem surrounding `NFC_DIGITAL`. I'm going to start by looking for the selection and dependency relationships on this configuration option. Specifically, I'm thinking: * Who is choosing `NFC_DIGITAL`? What other configurations might be prerequisites, or what features are explicitly requesting it? This will give me a first indication of the scope and use case. * What relies on it? I'm looking for direct dependencies, of course, but also indirect ones. Understanding the cascading effects is key. What modules or functionality become available or unavailable based on the selection of `NFC_DIGITAL`? Are there platform-specific considerations I need to keep in mind? Are there any potential conflicts I need to consider? * The drivers and their role: I will make sure I understand the purpose and functionality of the drivers involved. Are they implementing NFC protocol stacks? Controlling hardware interfaces? Managing security aspects? How do they interact with other parts of the system, like the kernel's NFC framework or user-space applications? My goal is to develop a clear mental map of `NFC_DIGITAL`'s position in the overall system architecture. This contextual understanding is essential before I can begin to assess any potential risks, optimizations, or areas for improvement. Time to start digging!
24/2	2026/09/12 13:24	tool	grepper	0m Args: { "Expression": "NFC_DIGITAL", "PathPrefix": "drivers/nfc" } Results: { "Output": "drivers/nfc/Kconfig=9=config NFC_TRF7970A\ndrivers/nfc/Kconfig-10-\ttristate \"Texas Instruments TRF7970a NFC driver\"\ndrivers/nfc/Kconfig:11:\tdepends on SPI \u0026\u0026 NFC_DIGITAL \u0026\u0026 GPIOLIB\ndrivers/nfc/Kconfig-12-\thelp\n--\ndrivers/nfc/Kconfig=31=config NFC_SIM\ndrivers/nfc/Kconfig-32-\ttristate \"NFC hardware simulator driver\"\ndrivers/nfc/Kconfig:33:\tdepends on NFC_DIGITAL\ndrivers/nfc/Kconfig-34-\thelp\n--\ndrivers/nfc/Kconfig=42=config NFC_PORT100\n--\ndrivers/nfc/Kconfig-44-\tdepends on USB\ndrivers/nfc/Kconfig:45:\tdepends on NFC_DIGITAL\ndrivers/nfc/Kconfig-46-\thelp\n--\ndrivers/nfc/nfcsim.c-27-\ndrivers/nfc/nfcsim.c:28:#define NFCSIM_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC \| \\\ndrivers/nfc/nfcsim.c:29:\t\t\t NFC_DIGITAL_DRV_CAPS_TG_CRC)\ndrivers/nfc/nfcsim.c-30-\n--\ndrivers/nfc/nfcsim.c=256=static int nfcsim_in_configure_hw(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/nfcsim.c-261-\tswitch (type) {\ndrivers/nfc/nfcsim.c:262:\tcase NFC_DIGITAL_CONFIG_RF_TECH:\ndrivers/nfc/nfcsim.c-263-\t\tdev-\u003eup = true;\n--\ndrivers/nfc/nfcsim.c-267-\ndrivers/nfc/nfcsim.c:268:\tcase NFC_DIGITAL_CONFIG_FRAMING:\ndrivers/nfc/nfcsim.c-269-\t\tbreak;\n--\ndrivers/nfc/nfcsim.c=286=static int nfcsim_tg_configure_hw(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/nfcsim.c-291-\tswitch (type) {\ndrivers/nfc/nfcsim.c:292:\tcase NFC_DIGITAL_CONFIG_RF_TECH:\ndrivers/nfc/nfcsim.c-293-\t\tdev-\u003eup = true;\n--\ndrivers/nfc/nfcsim.c-297-\ndrivers/nfc/nfcsim.c:298:\tcase NFC_DIGITAL_CONFIG_FRAMING:\ndrivers/nfc/nfcsim.c-299-\t\tbreak;\n--\ndrivers/nfc/port100.c-25-\ndrivers/nfc/port100.c:26:#define PORT100_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC \| \\\ndrivers/nfc/port100.c:27:\t\t\t NFC_DIGITAL_DRV_CAPS_TG_CRC)\ndrivers/nfc/port100.c-28-\n--\ndrivers/nfc/port100.c=118=static const struct port100_in_rf_setting in_rf_settings[] = {\ndrivers/nfc/port100.c:119:\t[NFC_DIGITAL_RF_TECH_212F] = {\ndrivers/nfc/port100.c-120-\t\t.in_send_set_number = 1,\n--\ndrivers/nfc/port100.c-124-\t},\ndrivers/nfc/port100.c:125:\t[NFC_DIGITAL_RF_TECH_424F] = {\ndrivers/nfc/port100.c-126-\t\t.in_send_set_number = 1,\n--\ndrivers/nfc/port100.c-130-\t},\ndrivers/nfc/port100.c:131:\t[NFC_DIGITAL_RF_TECH_106A] = {\ndrivers/nfc/port100.c-132-\t\t.in_send_set_number = 2,\n--\ndrivers/nfc/port100.c-136-\t},\ndrivers/nfc/port100.c:137:\t[NFC_DIGITAL_RF_TECH_106B] = {\ndrivers/nfc/port100.c-138-\t\t.in_send_set_number = 3,\n--\ndrivers/nfc/port100.c-142-\t},\ndrivers/nfc/port100.c:143:\t/* Ensures the array has NFC_DIGITAL_RF_TECH_LAST elements /\ndrivers/nfc/port100.c:144:\t[NFC_DIGITAL_RF_TECH_LAST] = { 0 },\ndrivers/nfc/port100.c-145-};\n--\ndrivers/nfc/port100.c=167=static const struct port100_tg_rf_setting tg_rf_settings[] = {\ndrivers/nfc/port100.c:168:\t[NFC_DIGITAL_RF_TECH_106A] = {\ndrivers/nfc/port100.c-169-\t\t.tg_set_number = 8,\n--\ndrivers/nfc/port100.c-171-\t},\ndrivers/nfc/port100.c:172:\t[NFC_DIGITAL_RF_TECH_212F] = {\ndrivers/nfc/port100.c-173-\t\t.tg_set_number = 8,\n--\ndrivers/nfc/port100.c-175-\t},\ndrivers/nfc/port100.c:176:\t[NFC_DIGITAL_RF_TECH_424F] = {\ndrivers/nfc/port100.c-177-\t\t.tg_set_number = 8,\n--\ndrivers/nfc/port100.c-179-\t},\ndrivers/nfc/port100.c:180:\t/ Ensures the array has NFC_DIGITAL_RF_TECH_LAST elements /\ndrivers/nfc/port100.c:181:\t[NFC_DIGITAL_RF_TECH_LAST] = { 0 },\ndrivers/nfc/port100.c-182-\n--\ndrivers/nfc/port100.c=221=in_protocols[][PORT100_IN_MAX_NUM_PROTOCOLS + 1] = {\ndrivers/nfc/port100.c:222:\t[NFC_DIGITAL_FRAMING_NFCA_SHORT] = {\ndrivers/nfc/port100.c-223-\t\t{ PORT100_IN_PROT_INITIAL_GUARD_TIME, 6 },\n--\ndrivers/nfc/port100.c-243-\t},\ndrivers/nfc/port100.c:244:\t[NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {\ndrivers/nfc/port100.c-245-\t\t{ PORT100_IN_PROT_INITIAL_GUARD_TIME, 6 },\n--\ndrivers/nfc/port100.c-265-\t},\ndrivers/nfc/port100.c:266:\t[NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {\ndrivers/nfc/port100.c-267-\t\t{ PORT100_IN_PROT_INITIAL_GUARD_TIME, 6 },\n--\ndrivers/nfc/port100.c-287-\t},\ndrivers/nfc/port100.c:288:\t[NFC_DIGITAL_FRAMING_NFCA_T1T] = {\ndrivers/nfc/port100.c-289-\t\t/ nfc_digital_framing_nfca_short /\n--\ndrivers/nfc/port100.c-295-\t},\ndrivers/nfc/port100.c:296:\t[NFC_DIGITAL_FRAMING_NFCA_T2T] = {\ndrivers/nfc/port100.c-297-\t\t/ nfc_digital_framing_nfca_standard /\n--\ndrivers/nfc/port100.c-301-\t},\ndrivers/nfc/port100.c:302:\t[NFC_DIGITAL_FRAMING_NFCA_T4T] = {\ndrivers/nfc/port100.c-303-\t\t/ nfc_digital_framing_nfca_standard_with_crc_a /\n--\ndrivers/nfc/port100.c-305-\t},\ndrivers/nfc/port100.c:306:\t[NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {\ndrivers/nfc/port100.c-307-\t\t/ nfc_digital_framing_nfca_standard /\n--\ndrivers/nfc/port100.c-309-\t},\ndrivers/nfc/port100.c:310:\t[NFC_DIGITAL_FRAMING_NFCF] = {\ndrivers/nfc/port100.c-311-\t\t{ PORT100_IN_PROT_INITIAL_GUARD_TIME, 18 },\n--\ndrivers/nfc/port100.c-331-\t},\ndrivers/nfc/port100.c:332:\t[NFC_DIGITAL_FRAMING_NFCF_T3T] = {\ndrivers/nfc/port100.c-333-\t\t/ nfc_digital_framing_nfcf /\n--\ndrivers/nfc/port100.c-335-\t},\ndrivers/nfc/port100.c:336:\t[NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {\ndrivers/nfc/port100.c-337-\t\t/ nfc_digital_framing_nfcf /\n--\ndrivers/nfc/port100.c-358-\t},\ndrivers/nfc/port100.c:359:\t[NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {\ndrivers/nfc/port100.c-360-\t\t{ PORT100_IN_PROT_END, 0 },\ndrivers/nfc/port100.c-361-\t},\ndrivers/nfc/port100.c:362:\t[NFC_DIGITAL_FRAMING_NFCB] = {\ndrivers/nfc/port100.c-363-\t\t{ PORT100_IN_PROT_INITIAL_GUARD_TIME, 20 },\n--\ndrivers/nfc/port100.c-383-\t},\ndrivers/nfc/port100.c:384:\t[NFC_DIGITAL_FRAMING_NFCB_T4T] = {\ndrivers/nfc/port100.c-385-\t\t/ nfc_digital_framing_nfcb /\n--\ndrivers/nfc/port100.c-387-\t},\ndrivers/nfc/port100.c:388:\t/ Ensures the array has NFC_DIGITAL_FRAMING_LAST elements /\ndrivers/nfc/port100.c:389:\t[NFC_DIGITAL_FRAMING_LAST] = {\ndrivers/nfc/port100.c-390-\t\t{ PORT100_IN_PROT_END, 0 },\n--\ndrivers/nfc/port100.c=395=tg_protocols[][PORT100_TG_MAX_NUM_PROTOCOLS + 1] = {\ndrivers/nfc/port100.c:396:\t[NFC_DIGITAL_FRAMING_NFCA_SHORT] = {\ndrivers/nfc/port100.c-397-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-398-\t},\ndrivers/nfc/port100.c:399:\t[NFC_DIGITAL_FRAMING_NFCA_STANDARD] = {\ndrivers/nfc/port100.c-400-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-401-\t},\ndrivers/nfc/port100.c:402:\t[NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A] = {\ndrivers/nfc/port100.c-403-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-404-\t},\ndrivers/nfc/port100.c:405:\t[NFC_DIGITAL_FRAMING_NFCA_T1T] = {\ndrivers/nfc/port100.c-406-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-407-\t},\ndrivers/nfc/port100.c:408:\t[NFC_DIGITAL_FRAMING_NFCA_T2T] = {\ndrivers/nfc/port100.c-409-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-410-\t},\ndrivers/nfc/port100.c:411:\t[NFC_DIGITAL_FRAMING_NFCA_NFC_DEP] = {\ndrivers/nfc/port100.c-412-\t\t{ PORT100_TG_PROT_TU, 1 },\n--\ndrivers/nfc/port100.c-416-\t},\ndrivers/nfc/port100.c:417:\t[NFC_DIGITAL_FRAMING_NFCF] = {\ndrivers/nfc/port100.c-418-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-419-\t},\ndrivers/nfc/port100.c:420:\t[NFC_DIGITAL_FRAMING_NFCF_T3T] = {\ndrivers/nfc/port100.c-421-\t\t{ PORT100_TG_PROT_END, 0 },\ndrivers/nfc/port100.c-422-\t},\ndrivers/nfc/port100.c:423:\t[NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {\ndrivers/nfc/port100.c-424-\t\t{ PORT100_TG_PROT_TU, 1 },\n--\ndrivers/nfc/port100.c-428-\t},\ndrivers/nfc/port100.c:429:\t[NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {\ndrivers/nfc/port100.c-430-\t\t{ PORT100_TG_PROT_RF_OFF, 1 },\n--\ndrivers/nfc/port100.c-432-\t},\ndrivers/nfc/port100.c:433:\t/ Ensures the array has NFC_DIGITAL_FRAMING_LAST elements /\ndrivers/nfc/port100.c:434:\t[NFC_DIGITAL_FRAMING_LAST] = {\ndrivers/nfc/port100.c-435-\t\t{ PORT100_TG_PROT_END, 0 },\n--\ndrivers/nfc/port100.c=1072=static int port100_in_set_rf(struct nfc_digital_dev ddev, u8 rf)\n--\ndrivers/nfc/port100.c-1078-\ndrivers/nfc/port100.c:1079:\tif (rf \u003e= NFC_DIGITAL_RF_TECH_LAST)\ndrivers/nfc/port100.c-1080-\t\treturn -EINVAL;\n--\ndrivers/nfc/port100.c=1101=static int port100_in_set_framing(struct nfc_digital_dev ddev, int param)\n--\ndrivers/nfc/port100.c-1110-\ndrivers/nfc/port100.c:1111:\tif (param \u003e= NFC_DIGITAL_FRAMING_LAST)\ndrivers/nfc/port100.c-1112-\t\treturn -EINVAL;\n--\ndrivers/nfc/port100.c=1143=static int port100_in_configure_hw(struct nfc_digital_dev ddev, int type,\n--\ndrivers/nfc/port100.c-1145-{\ndrivers/nfc/port100.c:1146:\tif (type == NFC_DIGITAL_CONFIG_RF_TECH)\ndrivers/nfc/port100.c-1147-\t\treturn port100_in_set_rf(ddev, param);\ndrivers/nfc/port100.c-1148-\ndrivers/nfc/port100.c:1149:\tif (type == NFC_DIGITAL_CONFIG_FRAMING)\ndrivers/nfc/port100.c-1150-\t\treturn port100_in_set_framing(ddev, param);\n--\ndrivers/nfc/port100.c=1229=static int port100_tg_set_rf(struct nfc_digital_dev ddev, u8 rf)\n--\ndrivers/nfc/port100.c-1235-\ndrivers/nfc/port100.c:1236:\tif (rf \u003e= NFC_DIGITAL_RF_TECH_LAST)\ndrivers/nfc/port100.c-1237-\t\treturn -EINVAL;\n--\ndrivers/nfc/port100.c=1258=static int port100_tg_set_framing(struct nfc_digital_dev ddev, int param)\n--\ndrivers/nfc/port100.c-1267-\ndrivers/nfc/port100.c:1268:\tif (param \u003e= NFC_DIGITAL_FRAMING_LAST)\ndrivers/nfc/port100.c-1269-\t\treturn -EINVAL;\n--\ndrivers/nfc/port100.c=1300=static int port100_tg_configure_hw(struct nfc_digital_dev ddev, int type,\n--\ndrivers/nfc/port100.c-1302-{\ndrivers/nfc/port100.c:1303:\tif (type == NFC_DIGITAL_CONFIG_RF_TECH)\ndrivers/nfc/port100.c-1304-\t\treturn port100_tg_set_rf(ddev, param);\ndrivers/nfc/port100.c-1305-\ndrivers/nfc/port100.c:1306:\tif (type == NFC_DIGITAL_CONFIG_FRAMING)\ndrivers/nfc/port100.c-1307-\t\treturn port100_tg_set_framing(ddev, param);\n--\ndrivers/nfc/port100.c=1400=static int port100_listen_mdaa(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/port100.c-1410-\ndrivers/nfc/port100.c:1411:\trc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,\ndrivers/nfc/port100.c:1412:\t\t\t\t NFC_DIGITAL_RF_TECH_106A);\ndrivers/nfc/port100.c-1413-\tif (rc)\n--\ndrivers/nfc/port100.c-1415-\ndrivers/nfc/port100.c:1416:\trc = port100_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\ndrivers/nfc/port100.c:1417:\t\t\t\t NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);\ndrivers/nfc/port100.c-1418-\tif (rc)\n--\ndrivers/nfc/st95hf/Kconfig=2=config NFC_ST95HF\ndrivers/nfc/st95hf/Kconfig-3-\ttristate \"ST95HF NFC Transceiver driver\"\ndrivers/nfc/st95hf/Kconfig:4:\tdepends on SPI \u0026\u0026 NFC_DIGITAL\ndrivers/nfc/st95hf/Kconfig-5-\thelp\n--\ndrivers/nfc/st95hf/core.c-30-/* driver capabilities /\ndrivers/nfc/st95hf/core.c:31:#define ST95HF_CAPABILITIES\t\tNFC_DIGITAL_DRV_CAPS_IN_CRC\ndrivers/nfc/st95hf/core.c-32-\n--\ndrivers/nfc/st95hf/core.c=374=static int st95hf_select_protocol(struct st95hf_context stcontext, int type)\n--\ndrivers/nfc/st95hf/core.c-381-\tswitch (type) {\ndrivers/nfc/st95hf/core.c:382:\tcase NFC_DIGITAL_RF_TECH_106A:\ndrivers/nfc/st95hf/core.c:383:\t\tstcontext-\u003ecurrent_rf_tech = NFC_DIGITAL_RF_TECH_106A;\ndrivers/nfc/st95hf/core.c-384-\t\tresult = st95hf_send_recv_cmd(stcontext,\n--\ndrivers/nfc/st95hf/core.c-402-\t\tbreak;\ndrivers/nfc/st95hf/core.c:403:\tcase NFC_DIGITAL_RF_TECH_106B:\ndrivers/nfc/st95hf/core.c:404:\t\tstcontext-\u003ecurrent_rf_tech = NFC_DIGITAL_RF_TECH_106B;\ndrivers/nfc/st95hf/core.c-405-\t\tresult = st95hf_send_recv_cmd(stcontext,\n--\ndrivers/nfc/st95hf/core.c-429-\t\tbreak;\ndrivers/nfc/st95hf/core.c:430:\tcase NFC_DIGITAL_RF_TECH_ISO15693:\ndrivers/nfc/st95hf/core.c:431:\t\tstcontext-\u003ecurrent_rf_tech = NFC_DIGITAL_RF_TECH_ISO15693;\ndrivers/nfc/st95hf/core.c-432-\t\tresult = st95hf_send_recv_cmd(stcontext,\n--\ndrivers/nfc/st95hf/core.c=648=static int st95hf_error_handling(struct st95hf_context stcontext,\n--\ndrivers/nfc/st95hf/core.c-666-\tswitch (stcontext-\u003ecurrent_rf_tech) {\ndrivers/nfc/st95hf/core.c:667:\tcase NFC_DIGITAL_RF_TECH_106A:\ndrivers/nfc/st95hf/core.c-668-\t\tif (stcontext-\u003esendrcv_trflag == TRFLAG_NFCA_STD_FRAME_CRC) {\n--\ndrivers/nfc/st95hf/core.c-677-\t\tbreak;\ndrivers/nfc/st95hf/core.c:678:\tcase NFC_DIGITAL_RF_TECH_106B:\ndrivers/nfc/st95hf/core.c:679:\tcase NFC_DIGITAL_RF_TECH_ISO15693:\ndrivers/nfc/st95hf/core.c-680-\t\terror_byte = skb_resp-\u003edata[res_len - 1];\n--\ndrivers/nfc/st95hf/core.c=693=static int st95hf_response_handler(struct st95hf_context stcontext,\n--\ndrivers/nfc/st95hf/core.c-736-\tswitch (stcontext-\u003ecurrent_rf_tech) {\ndrivers/nfc/st95hf/core.c:737:\tcase NFC_DIGITAL_RF_TECH_106A:\ndrivers/nfc/st95hf/core.c-738-\t\tif (stcontext-\u003esendrcv_trflag == TRFLAG_NFCA_STD_FRAME_CRC)\n--\ndrivers/nfc/st95hf/core.c-742-\t\tbreak;\ndrivers/nfc/st95hf/core.c:743:\tcase NFC_DIGITAL_RF_TECH_106B:\ndrivers/nfc/st95hf/core.c:744:\tcase NFC_DIGITAL_RF_TECH_ISO15693:\ndrivers/nfc/st95hf/core.c-745-\t\tskb_trim(skb_resp, (skb_len - 3));\n--\ndrivers/nfc/st95hf/core.c=869=static int st95hf_in_configure_hw(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/st95hf/core.c-874-\ndrivers/nfc/st95hf/core.c:875:\tif (type == NFC_DIGITAL_CONFIG_RF_TECH)\ndrivers/nfc/st95hf/core.c-876-\t\treturn st95hf_select_protocol(stcontext, param);\ndrivers/nfc/st95hf/core.c-877-\ndrivers/nfc/st95hf/core.c:878:\tif (type == NFC_DIGITAL_CONFIG_FRAMING) {\ndrivers/nfc/st95hf/core.c-879-\t\tswitch (param) {\ndrivers/nfc/st95hf/core.c:880:\t\tcase NFC_DIGITAL_FRAMING_NFCA_SHORT:\ndrivers/nfc/st95hf/core.c-881-\t\t\tstcontext-\u003esendrcv_trflag = TRFLAG_NFCA_SHORT_FRAME;\ndrivers/nfc/st95hf/core.c-882-\t\t\tbreak;\ndrivers/nfc/st95hf/core.c:883:\t\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD:\ndrivers/nfc/st95hf/core.c-884-\t\t\tstcontext-\u003esendrcv_trflag = TRFLAG_NFCA_STD_FRAME;\ndrivers/nfc/st95hf/core.c-885-\t\t\tbreak;\ndrivers/nfc/st95hf/core.c:886:\t\tcase NFC_DIGITAL_FRAMING_NFCA_T4T:\ndrivers/nfc/st95hf/core.c:887:\t\tcase NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:\ndrivers/nfc/st95hf/core.c:888:\t\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:\ndrivers/nfc/st95hf/core.c-889-\t\t\tstcontext-\u003esendrcv_trflag = TRFLAG_NFCA_STD_FRAME_CRC;\ndrivers/nfc/st95hf/core.c-890-\t\t\tbreak;\ndrivers/nfc/st95hf/core.c:891:\t\tcase NFC_DIGITAL_FRAMING_NFCB:\ndrivers/nfc/st95hf/core.c:892:\t\tcase NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:\ndrivers/nfc/st95hf/core.c:893:\t\tcase NFC_DIGITAL_FRAMING_ISO15693_T5T:\ndrivers/nfc/st95hf/core.c-894-\t\t\tbreak;\n--\ndrivers/nfc/st95hf/core.c=915=static int st95hf_in_send_cmd(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/st95hf/core.c-930-\tswitch (stcontext-\u003ecurrent_rf_tech) {\ndrivers/nfc/st95hf/core.c:931:\tcase NFC_DIGITAL_RF_TECH_106A:\ndrivers/nfc/st95hf/core.c-932-\t\tlen_data_to_tag = skb-\u003elen + 1;\n--\ndrivers/nfc/st95hf/core.c-934-\t\tbreak;\ndrivers/nfc/st95hf/core.c:935:\tcase NFC_DIGITAL_RF_TECH_106B:\ndrivers/nfc/st95hf/core.c:936:\tcase NFC_DIGITAL_RF_TECH_ISO15693:\ndrivers/nfc/st95hf/core.c-937-\t\tlen_data_to_tag = skb-\u003elen;\n--\ndrivers/nfc/trf7970a.c-93- * messes up the data returned so it is only enabled when the framing is\ndrivers/nfc/trf7970a.c:94: * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command.\ndrivers/nfc/trf7970a.c-95- * Unfortunately, that means that the driver has to peek into tx frames\ndrivers/nfc/trf7970a.c:96: * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by\ndrivers/nfc/trf7970a.c-97- * the trf7970a_per_cmd_config() routine.\n--\ndrivers/nfc/trf7970a.c=617=static int trf7970a_mode_detect(struct trf7970a trf, u8 rf_tech)\n--\ndrivers/nfc/trf7970a.c-627-\tcase TRF79070A_NFC_TARGET_PROTOCOL_106A:\ndrivers/nfc/trf7970a.c:628:\t\ttech = NFC_DIGITAL_RF_TECH_106A;\ndrivers/nfc/trf7970a.c-629-\t\tbreak;\ndrivers/nfc/trf7970a.c-630-\tcase TRF79070A_NFC_TARGET_PROTOCOL_106B:\ndrivers/nfc/trf7970a.c:631:\t\ttech = NFC_DIGITAL_RF_TECH_106B;\ndrivers/nfc/trf7970a.c-632-\t\tbreak;\ndrivers/nfc/trf7970a.c-633-\tcase TRF79070A_NFC_TARGET_PROTOCOL_212F:\ndrivers/nfc/trf7970a.c:634:\t\ttech = NFC_DIGITAL_RF_TECH_212F;\ndrivers/nfc/trf7970a.c-635-\t\tbreak;\ndrivers/nfc/trf7970a.c-636-\tcase TRF79070A_NFC_TARGET_PROTOCOL_424F:\ndrivers/nfc/trf7970a.c:637:\t\ttech = NFC_DIGITAL_RF_TECH_424F;\ndrivers/nfc/trf7970a.c-638-\t\tbreak;\n--\ndrivers/nfc/trf7970a.c=783=static void trf7970a_drain_fifo(struct trf7970a trf, u8 status)\n--\ndrivers/nfc/trf7970a.c-828-\t/ If received Type 2 ACK/NACK, shift right 4 bits and pass up /\ndrivers/nfc/trf7970a.c:829:\tif ((trf-\u003eframing == NFC_DIGITAL_FRAMING_NFCA_T2T) \u0026\u0026 (skb-\u003elen == 1) \u0026\u0026\ndrivers/nfc/trf7970a.c-830-\t (trf-\u003especial_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {\n--\ndrivers/nfc/trf7970a.c=865=static irqreturn_t trf7970a_irq(int irq, void dev_id)\n--\ndrivers/nfc/trf7970a.c-951-\t\t\tswitch (trf-\u003eframing) {\ndrivers/nfc/trf7970a.c:952:\t\t\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD:\ndrivers/nfc/trf7970a.c-953-\t\t\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;\n--\ndrivers/nfc/trf7970a.c-956-\t\t\t\tbreak;\ndrivers/nfc/trf7970a.c:957:\t\t\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:\ndrivers/nfc/trf7970a.c-958-\t\t\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT;\n--\ndrivers/nfc/trf7970a.c-961-\t\t\t\tbreak;\ndrivers/nfc/trf7970a.c:962:\t\t\tcase NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:\ndrivers/nfc/trf7970a.c-963-\t\t\t\tret = trf7970a_write(trf,\n--\ndrivers/nfc/trf7970a.c=1218=static int trf7970a_in_config_rf_tech(struct trf7970a trf, int tech)\n--\ndrivers/nfc/trf7970a.c-1224-\tswitch (tech) {\ndrivers/nfc/trf7970a.c:1225:\tcase NFC_DIGITAL_RF_TECH_106A:\ndrivers/nfc/trf7970a.c-1226-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;\n--\ndrivers/nfc/trf7970a.c-1231-\t\tbreak;\ndrivers/nfc/trf7970a.c:1232:\tcase NFC_DIGITAL_RF_TECH_106B:\ndrivers/nfc/trf7970a.c-1233-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;\n--\ndrivers/nfc/trf7970a.c-1238-\t\tbreak;\ndrivers/nfc/trf7970a.c:1239:\tcase NFC_DIGITAL_RF_TECH_212F:\ndrivers/nfc/trf7970a.c-1240-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;\n--\ndrivers/nfc/trf7970a.c-1245-\t\tbreak;\ndrivers/nfc/trf7970a.c:1246:\tcase NFC_DIGITAL_RF_TECH_424F:\ndrivers/nfc/trf7970a.c-1247-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;\n--\ndrivers/nfc/trf7970a.c-1252-\t\tbreak;\ndrivers/nfc/trf7970a.c:1253:\tcase NFC_DIGITAL_RF_TECH_ISO15693:\ndrivers/nfc/trf7970a.c-1254-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;\n--\ndrivers/nfc/trf7970a.c=1312=static int trf7970a_in_config_framing(struct trf7970a trf, int framing)\n--\ndrivers/nfc/trf7970a.c-1320-\tswitch (framing) {\ndrivers/nfc/trf7970a.c:1321:\tcase NFC_DIGITAL_FRAMING_NFCA_SHORT:\ndrivers/nfc/trf7970a.c:1322:\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD:\ndrivers/nfc/trf7970a.c-1323-\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;\n--\ndrivers/nfc/trf7970a.c-1325-\t\tbreak;\ndrivers/nfc/trf7970a.c:1326:\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:\ndrivers/nfc/trf7970a.c:1327:\tcase NFC_DIGITAL_FRAMING_NFCA_T4T:\ndrivers/nfc/trf7970a.c:1328:\tcase NFC_DIGITAL_FRAMING_NFCB:\ndrivers/nfc/trf7970a.c:1329:\tcase NFC_DIGITAL_FRAMING_NFCB_T4T:\ndrivers/nfc/trf7970a.c:1330:\tcase NFC_DIGITAL_FRAMING_NFCF:\ndrivers/nfc/trf7970a.c:1331:\tcase NFC_DIGITAL_FRAMING_NFCF_T3T:\ndrivers/nfc/trf7970a.c:1332:\tcase NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:\ndrivers/nfc/trf7970a.c:1333:\tcase NFC_DIGITAL_FRAMING_ISO15693_T5T:\ndrivers/nfc/trf7970a.c:1334:\tcase NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:\ndrivers/nfc/trf7970a.c:1335:\tcase NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:\ndrivers/nfc/trf7970a.c-1336-\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT;\n--\ndrivers/nfc/trf7970a.c-1338-\t\tbreak;\ndrivers/nfc/trf7970a.c:1339:\tcase NFC_DIGITAL_FRAMING_NFCA_T2T:\ndrivers/nfc/trf7970a.c-1340-\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT;\n--\ndrivers/nfc/trf7970a.c=1387=static int trf7970a_in_configure_hw(struct nfc_digital_dev ddev, int type,\n--\ndrivers/nfc/trf7970a.c-1406-\tswitch (type) {\ndrivers/nfc/trf7970a.c:1407:\tcase NFC_DIGITAL_CONFIG_RF_TECH:\ndrivers/nfc/trf7970a.c-1408-\t\tret = trf7970a_in_config_rf_tech(trf, param);\ndrivers/nfc/trf7970a.c-1409-\t\tbreak;\ndrivers/nfc/trf7970a.c:1410:\tcase NFC_DIGITAL_CONFIG_FRAMING:\ndrivers/nfc/trf7970a.c-1411-\t\tret = trf7970a_in_config_framing(trf, param);\n--\ndrivers/nfc/trf7970a.c=1439=static int trf7970a_per_cmd_config(struct trf7970a trf,\n--\ndrivers/nfc/trf7970a.c-1456-\t /\ndrivers/nfc/trf7970a.c:1457:\tif ((trf-\u003etechnology == NFC_DIGITAL_RF_TECH_106A) \u0026\u0026\ndrivers/nfc/trf7970a.c:1458:\t (trf-\u003eframing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {\ndrivers/nfc/trf7970a.c-1459-\t\tif (req[0] == NFC_T2T_CMD_READ)\n--\ndrivers/nfc/trf7970a.c-1471-\t\t}\ndrivers/nfc/trf7970a.c:1472:\t} else if (trf-\u003etechnology == NFC_DIGITAL_RF_TECH_ISO15693) {\ndrivers/nfc/trf7970a.c-1473-\t\tiso_ctrl = trf-\u003eiso_ctrl \u0026 ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;\n--\ndrivers/nfc/trf7970a.c-1498-\ndrivers/nfc/trf7970a.c:1499:\t\tif ((trf-\u003eframing == NFC_DIGITAL_FRAMING_ISO15693_T5T) \u0026\u0026\ndrivers/nfc/trf7970a.c-1500-\t\t trf7970a_is_iso15693_write_or_lock(req[1]) \u0026\u0026\n--\ndrivers/nfc/trf7970a.c=1508=static int trf7970a_send_cmd(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/trf7970a.c-1584-\ndrivers/nfc/trf7970a.c:1585:\tif (trf-\u003eframing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {\ndrivers/nfc/trf7970a.c-1586-\t\tprefix[3] = 0x00;\n--\ndrivers/nfc/trf7970a.c=1612=static int trf7970a_tg_config_rf_tech(struct trf7970a trf, int tech)\n--\ndrivers/nfc/trf7970a.c-1618-\tswitch (tech) {\ndrivers/nfc/trf7970a.c:1619:\tcase NFC_DIGITAL_RF_TECH_106A:\ndrivers/nfc/trf7970a.c-1620-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE \|\n--\ndrivers/nfc/trf7970a.c-1625-\t\tbreak;\ndrivers/nfc/trf7970a.c:1626:\tcase NFC_DIGITAL_RF_TECH_212F:\ndrivers/nfc/trf7970a.c-1627-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE \|\n--\ndrivers/nfc/trf7970a.c-1632-\t\tbreak;\ndrivers/nfc/trf7970a.c:1633:\tcase NFC_DIGITAL_RF_TECH_424F:\ndrivers/nfc/trf7970a.c-1634-\t\ttrf-\u003eiso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE \|\n--\ndrivers/nfc/trf7970a.c-1653-\t /\ndrivers/nfc/trf7970a.c:1654:\tif ((trf-\u003eframing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) \u0026\u0026\ndrivers/nfc/trf7970a.c-1655-\t (trf-\u003eiso_ctrl_tech != trf-\u003eiso_ctrl)) {\n--\ndrivers/nfc/trf7970a.c=1670=static int trf7970a_tg_config_framing(struct trf7970a trf, int framing)\n--\ndrivers/nfc/trf7970a.c-1677-\tswitch (framing) {\ndrivers/nfc/trf7970a.c:1678:\tcase NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:\ndrivers/nfc/trf7970a.c-1679-\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;\n--\ndrivers/nfc/trf7970a.c-1681-\t\tbreak;\ndrivers/nfc/trf7970a.c:1682:\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD:\ndrivers/nfc/trf7970a.c:1683:\tcase NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:\ndrivers/nfc/trf7970a.c:1684:\tcase NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:\ndrivers/nfc/trf7970a.c-1685-\t\t/ These ones are applied in the interrupt handler /\n--\ndrivers/nfc/trf7970a.c-1687-\t\tbreak;\ndrivers/nfc/trf7970a.c:1688:\tcase NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:\ndrivers/nfc/trf7970a.c-1689-\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT;\n--\ndrivers/nfc/trf7970a.c-1691-\t\tbreak;\ndrivers/nfc/trf7970a.c:1692:\tcase NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED:\ndrivers/nfc/trf7970a.c-1693-\t\ttrf-\u003etx_cmd = TRF7970A_CMD_TRANSMIT;\n--\ndrivers/nfc/trf7970a.c=1729=static int trf7970a_tg_configure_hw(struct nfc_digital_dev ddev, int type,\n--\ndrivers/nfc/trf7970a.c-1748-\tswitch (type) {\ndrivers/nfc/trf7970a.c:1749:\tcase NFC_DIGITAL_CONFIG_RF_TECH:\ndrivers/nfc/trf7970a.c-1750-\t\tret = trf7970a_tg_config_rf_tech(trf, param);\ndrivers/nfc/trf7970a.c-1751-\t\tbreak;\ndrivers/nfc/trf7970a.c:1752:\tcase NFC_DIGITAL_CONFIG_FRAMING:\ndrivers/nfc/trf7970a.c-1753-\t\tret = trf7970a_tg_config_framing(trf, param);\n--\ndrivers/nfc/trf7970a.c=1855=static int trf7970a_tg_listen_md(struct nfc_digital_dev ddev,\n--\ndrivers/nfc/trf7970a.c-1864-\ndrivers/nfc/trf7970a.c:1865:\tret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,\ndrivers/nfc/trf7970a.c:1866:\t\t\t\t NFC_DIGITAL_RF_TECH_106A);\ndrivers/nfc/trf7970a.c-1867-\tif (ret)\n--\ndrivers/nfc/trf7970a.c-1869-\ndrivers/nfc/trf7970a.c:1870:\tret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\ndrivers/nfc/trf7970a.c:1871:\t\t\t\t NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);\ndrivers/nfc/trf7970a.c-1872-\tif (ret)\n--\ndrivers/nfc/trf7970a.c=2045=static int trf7970a_probe(struct spi_device spi)\n--\ndrivers/nfc/trf7970a.c-2175-\t\t\t\t\t\tTRF7970A_SUPPORTED_PROTOCOLS,\ndrivers/nfc/trf7970a.c:2176:\t\t\t\t\t\tNFC_DIGITAL_DRV_CAPS_IN_CRC \|\ndrivers/nfc/trf7970a.c:2177:\t\t\t\t\t\tNFC_DIGITAL_DRV_CAPS_TG_CRC, 0,\ndrivers/nfc/trf7970a.c-2178-\t\t\t\t\t\t0);\n" }
25/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36277 output: 34 thoughts: 64 Thoughts: Analyzing NFC Driver Dependencies Okay, so I'm looking at these NFC-related configurations and need to understand their relationships. Specifically, I see that `NFC_PORT100` is dependent on both `USB` and `NFC_DIGITAL`. That makes sense; `NFC_PORT100` probably refers to a specific type of NFC reader that interfaces via USB. And of course, it needs the underlying digital NFC support. Then I see `NFC_SIM` only depends on `NFC_DIGITAL`, which likely means `NFC_SIM` support uses NFC functionality but not a USB connection. To get a clearer picture of how these options are structured, I should dive into the Kconfig file for the NFC drivers. I'll need to check `drivers/nfc/Kconfig` to see the complete context around `NFC_PORT100` and `NFC_SIM`. I'm expecting to find information about default values, help text, and other dependencies that I haven't considered yet. Understanding the Kconfig hierarchy is key to making sure my configurations are correct and don't introduce any conflicts. Time to dig in!
26/2	2026/09/12 13:24	tool	read-file	0m Args: { "File": "drivers/nfc/Kconfig", "FirstLine": 30, "LineCount": 25 } Results: { "Contents": " 30:\t\n 31:\tconfig NFC_SIM\n 32:\t\ttristate \"NFC hardware simulator driver\"\n 33:\t\tdepends on NFC_DIGITAL\n 34:\t\thelp\n 35:\t\t This driver declares two virtual NFC devices supporting NFC-DEP\n 36:\t\t protocol. An LLCP connection can be established between them and\n 37:\t\t all packets sent from one device is sent back to the other, acting as\n 38:\t\t loopback devices.\n 39:\t\n 40:\t\t If unsure, say N.\n 41:\t\n 42:\tconfig NFC_PORT100\n 43:\t\ttristate \"Sony NFC Port-100 Series USB device support\"\n 44:\t\tdepends on USB\n 45:\t\tdepends on NFC_DIGITAL\n 46:\t\thelp\n 47:\t\t This adds support for Sony Port-100 chip based USB devices such as the\n 48:\t\t RC-S380 dongle.\n 49:\t\n 50:\t\t If unsure, say N.\n 51:\t\n 52:\tconfig NFC_VIRTUAL_NCI\n 53:\t\ttristate \"NCI device simulator driver\"\n 54:\t\tdepends on NFC_NCI\n" }
27/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36954 output: 33 thoughts: 244 Thoughts: My NFC Fuzzing Hypothesis Okay, let's break this down. First, I'm looking at `NFC_SIM`, that virtual NFC driver, essentially a loopback for NFC-DEP. Interesting, a closed system to explore and perhaps leverage. Then there's `NFC_PORT100`, which is Sony's NFC USB device driver, obviously USB-dependent. Now the crucial connection: syzkaller has USB fuzzing capabilities with its gadget and raw_gadget features, and it's already hammering away at NFC sockets (AF_NFC) and netlink. This is promising, especially given how aggressively syzkaller targets `net/nfc/` generally, revealing plenty of bugs. My immediate thought is, "Does syzkaller have NFC syscall descriptions, or is it already fuzzing NFC effectively?" It makes sense to verify. A quick check confirms `AF_NFC` is indeed present in the kernel via `net/nfc/af_nfc.c`. Now, I want to understand how `digital_dep` is invoked. What are the calling patterns? I'll use `digital_dep` or `nfc_digital` as the search terms within `net/nfc/` for more context.
28/2	2026/09/12 13:24	tool	grepper	0m Args: { "Expression": "digital_tg_recv_dep_req", "PathPrefix": "net/nfc" } Results: { "Output": "net/nfc/digital_dep.c=106=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-107-\t\t\t\t struct sk_buff resp);\nnet/nfc/digital_dep.c:108:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-109-\t\t\t\t struct sk_buff resp);\n--\nnet/nfc/digital_dep.c=978=static int digital_tg_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1012-\nnet/nfc/digital_dep.c:1013:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1014-\t\t\t\t data_exch);\n--\nnet/nfc/digital_dep.c=1024=static int digital_tg_send_atn(struct nfc_digital_dev ddev)\n--\nnet/nfc/digital_dep.c-1051-\nnet/nfc/digital_dep.c:1052:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1053-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c=1060=static int digital_tg_send_saved_skb(struct nfc_digital_dev ddev)\n--\nnet/nfc/digital_dep.c-1069-\trc = digital_tg_send_cmd(ddev, ddev-\u003esaved_skb, 1500,\nnet/nfc/digital_dep.c:1070:\t\t\t\t digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1071-\tif (rc)\n--\nnet/nfc/digital_dep.c-1076-\nnet/nfc/digital_dep.c:1077:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-1078-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_dep.c=1297=int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\n--\nnet/nfc/digital_dep.c-1331-\nnet/nfc/digital_dep.c:1332:\trc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1333-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c=1348=static void digital_tg_send_psl_res_complete(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1359-\nnet/nfc/digital_dep.c:1360:\tdigital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1361-\n--\nnet/nfc/digital_dep.c=1467=static void digital_tg_send_atr_res_complete(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1485-\telse\nnet/nfc/digital_dep.c:1486:\t\tdigital_tg_recv_dep_req(ddev, arg, resp);\nnet/nfc/digital_dep.c-1487-}\n" }
29/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 38523 output: 28 thoughts: 124 Thoughts: Analyzing DEP Request Handling Okay, so `digital_tg_recv_dep_req` is the key function, the receive handler for DEP requests in target mode. My immediate thought is to trace the execution flow and see where this function is actually triggered during DEP link setup or target operations. I'll need to identify the points of origin. First, I need to check `net/nfc/digital_dep.c` to see how responses are handled. I'm looking for the function calls that might relate to the trigger. Specifically, I'm interested in `digital_tg_send_atr_res_complete`, `digital_tg_send_dep_res`, and `digital_tg_send_psl_res_complete`, to see if there is any indication of the call to the receive handler. Next, I need to understand how the target listens and initiates itself. For this part, I should examine `digital_technology.c` and `digital_core.c` to determine how the DEP operations are initiated. That should give a more complete picture of the overall architecture.
30/2	2026/09/12 13:24	tool	grepper	0m Args: { "Expression": "digital_tg_", "PathPrefix": "net/nfc" } Results: { "Output": "net/nfc/digital.h=48=int digital_send_cmd(struct nfc_digital_dev ddev, u8 cmd_type,\nnet/nfc/digital.h:49:\t\t struct sk_buff skb, struct digital_tg_mdaa_params params,\nnet/nfc/digital.h-50-\t\t u16 timeout, nfc_digital_cmd_complete_t cmd_cb,\n--\nnet/nfc/digital.h=83=int digital_in_send_dep_req(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital.h-86-\nnet/nfc/digital.h:87:int digital_tg_configure_hw(struct nfc_digital_dev ddev, int type, int param);\nnet/nfc/digital.h:88:static inline int digital_tg_send_cmd(struct nfc_digital_dev ddev,\nnet/nfc/digital.h-89-\t\t\tstruct sk_buff skb, u16 timeout,\n--\nnet/nfc/digital.h-95-\nnet/nfc/digital.h:96:void digital_tg_recv_sens_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital.h-97-\t\t\t struct sk_buff resp);\nnet/nfc/digital.h-98-\nnet/nfc/digital.h:99:void digital_tg_recv_sensf_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital.h-100-\t\t\t struct sk_buff resp);\nnet/nfc/digital.h-101-\nnet/nfc/digital.h:102:static inline int digital_tg_listen(struct nfc_digital_dev ddev, u16 timeout,\nnet/nfc/digital.h-103-\t\t\t\t nfc_digital_cmd_complete_t cb, void arg)\n--\nnet/nfc/digital.h-108-\nnet/nfc/digital.h:109:void digital_tg_recv_atr_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital.h-110-\t\t\t struct sk_buff resp);\nnet/nfc/digital.h-111-\nnet/nfc/digital.h:112:int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb);\nnet/nfc/digital.h-113-\nnet/nfc/digital.h:114:int digital_tg_listen_nfca(struct nfc_digital_dev ddev, u8 rf_tech);\nnet/nfc/digital.h:115:int digital_tg_listen_nfcf(struct nfc_digital_dev ddev, u8 rf_tech);\nnet/nfc/digital.h:116:void digital_tg_recv_md_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital.h-117-\t\t\t struct sk_buff resp);\n--\nnet/nfc/digital_core.c=27=struct digital_cmd {\n--\nnet/nfc/digital_core.c-35-\tstruct sk_buff resp;\nnet/nfc/digital_core.c:36:\tstruct digital_tg_mdaa_params mdaa_params;\nnet/nfc/digital_core.c-37-\n--\nnet/nfc/digital_core.c=152=static void digital_wq_cmd(struct work_struct work)\n--\nnet/nfc/digital_core.c-155-\tstruct digital_cmd cmd;\nnet/nfc/digital_core.c:156:\tstruct digital_tg_mdaa_params params;\nnet/nfc/digital_core.c-157-\tstruct nfc_digital_dev ddev = container_of(work,\n--\nnet/nfc/digital_core.c=227=int digital_send_cmd(struct nfc_digital_dev ddev, u8 cmd_type,\nnet/nfc/digital_core.c:228:\t\t struct sk_buff skb, struct digital_tg_mdaa_params params,\nnet/nfc/digital_core.c-229-\t\t u16 timeout, nfc_digital_cmd_complete_t cmd_cb,\n--\nnet/nfc/digital_core.c=255=int digital_in_configure_hw(struct nfc_digital_dev ddev, int type, int param)\n--\nnet/nfc/digital_core.c-265-\nnet/nfc/digital_core.c:266:int digital_tg_configure_hw(struct nfc_digital_dev ddev, int type, int param)\nnet/nfc/digital_core.c-267-{\n--\nnet/nfc/digital_core.c-276-\nnet/nfc/digital_core.c:277:static int digital_tg_listen_mdaa(struct nfc_digital_dev ddev, u8 rf_tech)\nnet/nfc/digital_core.c-278-{\nnet/nfc/digital_core.c:279:\tstruct digital_tg_mdaa_params params;\nnet/nfc/digital_core.c-280-\tint rc;\n--\nnet/nfc/digital_core.c-295-\trc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,\nnet/nfc/digital_core.c:296:\t\t\t 500, digital_tg_recv_atr_req, NULL);\nnet/nfc/digital_core.c-297-\tif (rc)\n--\nnet/nfc/digital_core.c-302-\nnet/nfc/digital_core.c:303:static int digital_tg_listen_md(struct nfc_digital_dev ddev, u8 rf_tech)\nnet/nfc/digital_core.c-304-{\nnet/nfc/digital_core.c-305-\treturn digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,\nnet/nfc/digital_core.c:306:\t\t\t\tdigital_tg_recv_md_req, NULL);\nnet/nfc/digital_core.c-307-}\n--\nnet/nfc/digital_core.c=476=static int digital_start_poll(struct nfc_dev nfc_dev, __u32 im_protocols,\n--\nnet/nfc/digital_core.c-528-\t\t\tdigital_add_poll_tech(ddev, 0,\nnet/nfc/digital_core.c:529:\t\t\t\t\t digital_tg_listen_mdaa);\nnet/nfc/digital_core.c-530-\t\t} else if (ddev-\u003eops-\u003etg_listen_md) {\nnet/nfc/digital_core.c-531-\t\t\tdigital_add_poll_tech(ddev, 0,\nnet/nfc/digital_core.c:532:\t\t\t\t\t digital_tg_listen_md);\nnet/nfc/digital_core.c-533-\t\t} else {\nnet/nfc/digital_core.c-534-\t\t\tdigital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,\nnet/nfc/digital_core.c:535:\t\t\t\t\t digital_tg_listen_nfca);\nnet/nfc/digital_core.c-536-\nnet/nfc/digital_core.c-537-\t\t\tdigital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,\nnet/nfc/digital_core.c:538:\t\t\t\t\t digital_tg_listen_nfcf);\nnet/nfc/digital_core.c-539-\nnet/nfc/digital_core.c-540-\t\t\tdigital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,\nnet/nfc/digital_core.c:541:\t\t\t\t\t digital_tg_listen_nfcf);\nnet/nfc/digital_core.c-542-\t\t}\n--\nnet/nfc/digital_core.c=641=static void digital_deactivate_target(struct nfc_dev nfc_dev,\n--\nnet/nfc/digital_core.c-655-\nnet/nfc/digital_core.c:656:static int digital_tg_send(struct nfc_dev dev, struct sk_buff skb)\nnet/nfc/digital_core.c-657-{\n--\nnet/nfc/digital_core.c-659-\nnet/nfc/digital_core.c:660:\treturn digital_tg_send_dep_res(ddev, skb);\nnet/nfc/digital_core.c-661-}\n--\nnet/nfc/digital_core.c=744=static const struct nfc_ops digital_nfc_ops = {\n--\nnet/nfc/digital_core.c-752-\t.deactivate_target = digital_deactivate_target,\nnet/nfc/digital_core.c:753:\t.tm_send = digital_tg_send,\nnet/nfc/digital_core.c-754-\t.im_transceive = digital_in_send,\n--\nnet/nfc/digital_dep.c=106=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-107-\t\t\t\t struct sk_buff resp);\nnet/nfc/digital_dep.c:108:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-109-\t\t\t\t struct sk_buff resp);\n--\nnet/nfc/digital_dep.c=904=int digital_in_send_dep_req(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-950-\nnet/nfc/digital_dep.c:951:static void digital_tg_set_rf_tech(struct nfc_digital_dev ddev, u8 rf_tech)\nnet/nfc/digital_dep.c-952-{\n--\nnet/nfc/digital_dep.c-977-\nnet/nfc/digital_dep.c:978:static int digital_tg_send_ack(struct nfc_digital_dev ddev,\nnet/nfc/digital_dep.c-979-\t\t\t struct digital_data_exch data_exch)\n--\nnet/nfc/digital_dep.c-1012-\nnet/nfc/digital_dep.c:1013:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1014-\t\t\t\t data_exch);\n--\nnet/nfc/digital_dep.c-1023-\nnet/nfc/digital_dep.c:1024:static int digital_tg_send_atn(struct nfc_digital_dev ddev)\nnet/nfc/digital_dep.c-1025-{\n--\nnet/nfc/digital_dep.c-1051-\nnet/nfc/digital_dep.c:1052:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1053-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c-1059-\nnet/nfc/digital_dep.c:1060:static int digital_tg_send_saved_skb(struct nfc_digital_dev ddev)\nnet/nfc/digital_dep.c-1061-{\n--\nnet/nfc/digital_dep.c-1068-\nnet/nfc/digital_dep.c:1069:\trc = digital_tg_send_cmd(ddev, ddev-\u003esaved_skb, 1500,\nnet/nfc/digital_dep.c:1070:\t\t\t\t digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1071-\tif (rc)\n--\nnet/nfc/digital_dep.c-1076-\nnet/nfc/digital_dep.c:1077:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-1078-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_dep.c-1156-\t\t\t * which is the previous DEP_RES saved in\nnet/nfc/digital_dep.c:1157:\t\t\t * digital_tg_send_dep_res().\nnet/nfc/digital_dep.c-1158-\t\t\t /\n--\nnet/nfc/digital_dep.c-1160-\t\t\t DIGITAL_NFC_DEP_PFB_PNI(ddev-\u003ecurr_nfc_dep_pni - 1)) {\nnet/nfc/digital_dep.c:1161:\t\t\t\trc = digital_tg_send_saved_skb(ddev);\nnet/nfc/digital_dep.c-1162-\t\t\t\tif (rc)\n--\nnet/nfc/digital_dep.c-1184-\t\tresp = digital_recv_dep_data_gather(ddev, pfb, resp,\nnet/nfc/digital_dep.c:1185:\t\t\t\t\t\t digital_tg_send_ack, NULL);\nnet/nfc/digital_dep.c-1186-\t\tif (IS_ERR(resp)) {\n--\nnet/nfc/digital_dep.c-1210-\nnet/nfc/digital_dep.c:1211:\t\t\trc = digital_tg_send_saved_skb(ddev);\nnet/nfc/digital_dep.c-1212-\t\t\tif (rc)\n--\nnet/nfc/digital_dep.c-1230-\t\t\t\t\t\tddev-\u003ecurr_nfc_dep_pni) {\nnet/nfc/digital_dep.c:1231:\t\t\t\trc = digital_tg_send_saved_skb(ddev);\nnet/nfc/digital_dep.c-1232-\t\t\t\tif (rc)\n--\nnet/nfc/digital_dep.c-1254-\nnet/nfc/digital_dep.c:1255:\t\trc = digital_tg_send_dep_res(ddev, ddev-\u003echaining_skb);\nnet/nfc/digital_dep.c-1256-\t\tif (rc)\n--\nnet/nfc/digital_dep.c-1265-\nnet/nfc/digital_dep.c:1266:\t\trc = digital_tg_send_atn(ddev);\nnet/nfc/digital_dep.c-1267-\t\tif (rc)\n--\nnet/nfc/digital_dep.c-1296-\nnet/nfc/digital_dep.c:1297:int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\nnet/nfc/digital_dep.c-1298-{\n--\nnet/nfc/digital_dep.c-1331-\nnet/nfc/digital_dep.c:1332:\trc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1333-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c-1347-\nnet/nfc/digital_dep.c:1348:static void digital_tg_send_psl_res_complete(struct nfc_digital_dev ddev,\nnet/nfc/digital_dep.c-1349-\t\t\t\t\t void arg, struct sk_buff resp)\n--\nnet/nfc/digital_dep.c-1355-\nnet/nfc/digital_dep.c:1356:\tdigital_tg_set_rf_tech(ddev, rf_tech);\nnet/nfc/digital_dep.c-1357-\nnet/nfc/digital_dep.c:1358:\tdigital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);\nnet/nfc/digital_dep.c-1359-\nnet/nfc/digital_dep.c:1360:\tdigital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1361-\n--\nnet/nfc/digital_dep.c-1364-\nnet/nfc/digital_dep.c:1365:static int digital_tg_send_psl_res(struct nfc_digital_dev ddev, u8 did,\nnet/nfc/digital_dep.c-1366-\t\t\t\t u8 rf_tech)\n--\nnet/nfc/digital_dep.c-1389-\nnet/nfc/digital_dep.c:1390:\trc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete,\nnet/nfc/digital_dep.c-1391-\t\t\t\t (void )(unsigned long)rf_tech);\n--\nnet/nfc/digital_dep.c-1397-\nnet/nfc/digital_dep.c:1398:static void digital_tg_recv_psl_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-1399-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_dep.c-1460-\nnet/nfc/digital_dep.c:1461:\trc = digital_tg_send_psl_res(ddev, psl_req-\u003edid, rf_tech);\nnet/nfc/digital_dep.c-1462-\n--\nnet/nfc/digital_dep.c-1466-\nnet/nfc/digital_dep.c:1467:static void digital_tg_send_atr_res_complete(struct nfc_digital_dev ddev,\nnet/nfc/digital_dep.c-1468-\t\t\t\t\t void arg, struct sk_buff resp)\n--\nnet/nfc/digital_dep.c-1483-\tif (resp-\u003edata[offset] == DIGITAL_CMD_PSL_REQ)\nnet/nfc/digital_dep.c:1484:\t\tdigital_tg_recv_psl_req(ddev, arg, resp);\nnet/nfc/digital_dep.c-1485-\telse\nnet/nfc/digital_dep.c:1486:\t\tdigital_tg_recv_dep_req(ddev, arg, resp);\nnet/nfc/digital_dep.c-1487-}\nnet/nfc/digital_dep.c-1488-\nnet/nfc/digital_dep.c:1489:static int digital_tg_send_atr_res(struct nfc_digital_dev ddev,\nnet/nfc/digital_dep.c-1490-\t\t\t\t struct digital_atr_req atr_req)\n--\nnet/nfc/digital_dep.c-1532-\nnet/nfc/digital_dep.c:1533:\trc = digital_tg_send_cmd(ddev, skb, 999,\nnet/nfc/digital_dep.c:1534:\t\t\t\t digital_tg_send_atr_res_complete, NULL);\nnet/nfc/digital_dep.c-1535-\tif (rc)\n--\nnet/nfc/digital_dep.c-1540-\nnet/nfc/digital_dep.c:1541:void digital_tg_recv_atr_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-1542-\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_dep.c-1561-\t\tmin_size = DIGITAL_ATR_REQ_MIN_SIZE + 2;\nnet/nfc/digital_dep.c:1562:\t\tdigital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A);\nnet/nfc/digital_dep.c-1563-\t} else {\nnet/nfc/digital_dep.c-1564-\t\tmin_size = DIGITAL_ATR_REQ_MIN_SIZE + 1;\nnet/nfc/digital_dep.c:1565:\t\tdigital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F);\nnet/nfc/digital_dep.c-1566-\t}\n--\nnet/nfc/digital_dep.c-1605-\nnet/nfc/digital_dep.c:1606:\trc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\nnet/nfc/digital_dep.c-1607-\t\t\t\t NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED);\n--\nnet/nfc/digital_dep.c-1610-\nnet/nfc/digital_dep.c:1611:\trc = digital_tg_send_atr_res(ddev, atr_req);\nnet/nfc/digital_dep.c-1612-\tif (rc)\n--\nnet/nfc/digital_technology.c=895=int digital_in_send_iso15693_inv_req(struct nfc_digital_dev ddev, u8 rf_tech)\n--\nnet/nfc/digital_technology.c-934-\nnet/nfc/digital_technology.c:935:static int digital_tg_send_sel_res(struct nfc_digital_dev ddev)\nnet/nfc/digital_technology.c-936-{\n--\nnet/nfc/digital_technology.c-948-\nnet/nfc/digital_technology.c:949:\trc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\nnet/nfc/digital_technology.c-950-\t\t\t\t NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE);\n--\nnet/nfc/digital_technology.c-955-\nnet/nfc/digital_technology.c:956:\trc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_atr_req,\nnet/nfc/digital_technology.c-957-\t\t\t\t NULL);\n--\nnet/nfc/digital_technology.c-963-\nnet/nfc/digital_technology.c:964:static void digital_tg_recv_sel_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_technology.c-965-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_technology.c-984-\nnet/nfc/digital_technology.c:985:\trc = digital_tg_send_sel_res(ddev);\nnet/nfc/digital_technology.c-986-\n--\nnet/nfc/digital_technology.c-993-\nnet/nfc/digital_technology.c:994:static int digital_tg_send_sdd_res(struct nfc_digital_dev ddev)\nnet/nfc/digital_technology.c-995-{\n--\nnet/nfc/digital_technology.c-1013-\nnet/nfc/digital_technology.c:1014:\trc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\nnet/nfc/digital_technology.c-1015-\t\t\t\tNFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A);\n--\nnet/nfc/digital_technology.c-1020-\nnet/nfc/digital_technology.c:1021:\trc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sel_req,\nnet/nfc/digital_technology.c-1022-\t\t\t\t NULL);\n--\nnet/nfc/digital_technology.c-1028-\nnet/nfc/digital_technology.c:1029:static void digital_tg_recv_sdd_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_technology.c-1030-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_technology.c-1048-\nnet/nfc/digital_technology.c:1049:\trc = digital_tg_send_sdd_res(ddev);\nnet/nfc/digital_technology.c-1050-\n--\nnet/nfc/digital_technology.c-1057-\nnet/nfc/digital_technology.c:1058:static int digital_tg_send_sens_res(struct nfc_digital_dev ddev)\nnet/nfc/digital_technology.c-1059-{\n--\nnet/nfc/digital_technology.c-1072-\nnet/nfc/digital_technology.c:1073:\trc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\nnet/nfc/digital_technology.c-1074-\t\t\t\t NFC_DIGITAL_FRAMING_NFCA_STANDARD);\n--\nnet/nfc/digital_technology.c-1079-\nnet/nfc/digital_technology.c:1080:\trc = digital_tg_send_cmd(ddev, skb, 300, digital_tg_recv_sdd_req,\nnet/nfc/digital_technology.c-1081-\t\t\t\t NULL);\n--\nnet/nfc/digital_technology.c-1087-\nnet/nfc/digital_technology.c:1088:void digital_tg_recv_sens_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_technology.c-1089-\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_technology.c-1107-\nnet/nfc/digital_technology.c:1108:\trc = digital_tg_send_sens_res(ddev);\nnet/nfc/digital_technology.c-1109-\n--\nnet/nfc/digital_technology.c-1116-\nnet/nfc/digital_technology.c:1117:static void digital_tg_recv_atr_or_sensf_req(struct nfc_digital_dev ddev,\nnet/nfc/digital_technology.c-1118-\t\tvoid arg, struct sk_buff resp)\n--\nnet/nfc/digital_technology.c-1121-\t\t\t(resp-\u003edata[1] == DIGITAL_CMD_SENSF_REQ))\nnet/nfc/digital_technology.c:1122:\t\tdigital_tg_recv_sensf_req(ddev, arg, resp);\nnet/nfc/digital_technology.c-1123-\telse\nnet/nfc/digital_technology.c:1124:\t\tdigital_tg_recv_atr_req(ddev, arg, resp);\nnet/nfc/digital_technology.c-1125-\n--\nnet/nfc/digital_technology.c-1128-\nnet/nfc/digital_technology.c:1129:static int digital_tg_send_sensf_res(struct nfc_digital_dev ddev,\nnet/nfc/digital_technology.c-1130-\t\t\t struct digital_sensf_req sensf_req)\n--\nnet/nfc/digital_technology.c-1172-\nnet/nfc/digital_technology.c:1173:\trc = digital_tg_send_cmd(ddev, skb, 300,\nnet/nfc/digital_technology.c:1174:\t\t\t\t digital_tg_recv_atr_or_sensf_req, NULL);\nnet/nfc/digital_technology.c-1175-\tif (rc)\n--\nnet/nfc/digital_technology.c-1180-\nnet/nfc/digital_technology.c:1181:void digital_tg_recv_sensf_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_technology.c-1182-\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_technology.c-1213-\nnet/nfc/digital_technology.c:1214:\trc = digital_tg_send_sensf_res(ddev, sensf_req);\nnet/nfc/digital_technology.c-1215-\n--\nnet/nfc/digital_technology.c-1222-\nnet/nfc/digital_technology.c:1223:static int digital_tg_config_nfca(struct nfc_digital_dev ddev)\nnet/nfc/digital_technology.c-1224-{\n--\nnet/nfc/digital_technology.c-1226-\nnet/nfc/digital_technology.c:1227:\trc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,\nnet/nfc/digital_technology.c-1228-\t\t\t\t NFC_DIGITAL_RF_TECH_106A);\n--\nnet/nfc/digital_technology.c-1231-\nnet/nfc/digital_technology.c:1232:\treturn digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\nnet/nfc/digital_technology.c-1233-\t\t\t\t NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);\n--\nnet/nfc/digital_technology.c-1235-\nnet/nfc/digital_technology.c:1236:int digital_tg_listen_nfca(struct nfc_digital_dev ddev, u8 rf_tech)\nnet/nfc/digital_technology.c-1237-{\n--\nnet/nfc/digital_technology.c-1239-\nnet/nfc/digital_technology.c:1240:\trc = digital_tg_config_nfca(ddev);\nnet/nfc/digital_technology.c-1241-\tif (rc)\n--\nnet/nfc/digital_technology.c-1243-\nnet/nfc/digital_technology.c:1244:\treturn digital_tg_listen(ddev, 300, digital_tg_recv_sens_req, NULL);\nnet/nfc/digital_technology.c-1245-}\nnet/nfc/digital_technology.c-1246-\nnet/nfc/digital_technology.c:1247:static int digital_tg_config_nfcf(struct nfc_digital_dev ddev, u8 rf_tech)\nnet/nfc/digital_technology.c-1248-{\n--\nnet/nfc/digital_technology.c-1250-\nnet/nfc/digital_technology.c:1251:\trc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);\nnet/nfc/digital_technology.c-1252-\tif (rc)\n--\nnet/nfc/digital_technology.c-1254-\nnet/nfc/digital_technology.c:1255:\treturn digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,\nnet/nfc/digital_technology.c-1256-\t\t\t\t NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);\n--\nnet/nfc/digital_technology.c-1258-\nnet/nfc/digital_technology.c:1259:int digital_tg_listen_nfcf(struct nfc_digital_dev ddev, u8 rf_tech)\nnet/nfc/digital_technology.c-1260-{\n--\nnet/nfc/digital_technology.c-1262-\nnet/nfc/digital_technology.c:1263:\trc = digital_tg_config_nfcf(ddev, rf_tech);\nnet/nfc/digital_technology.c-1264-\tif (rc)\n--\nnet/nfc/digital_technology.c-1266-\nnet/nfc/digital_technology.c:1267:\treturn digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, NULL);\nnet/nfc/digital_technology.c-1268-}\nnet/nfc/digital_technology.c-1269-\nnet/nfc/digital_technology.c:1270:void digital_tg_recv_md_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_technology.c-1271-\t\t\t struct sk_buff *resp)\n--\nnet/nfc/digital_technology.c-1286-\tcase NFC_DIGITAL_RF_TECH_106A:\nnet/nfc/digital_technology.c:1287:\t\trc = digital_tg_config_nfca(ddev);\nnet/nfc/digital_technology.c-1288-\t\tif (rc)\nnet/nfc/digital_technology.c-1289-\t\t\tgoto exit_free_skb;\nnet/nfc/digital_technology.c:1290:\t\tdigital_tg_recv_sens_req(ddev, arg, resp);\nnet/nfc/digital_technology.c-1291-\t\tbreak;\n--\nnet/nfc/digital_technology.c-1293-\tcase NFC_DIGITAL_RF_TECH_424F:\nnet/nfc/digital_technology.c:1294:\t\trc = digital_tg_config_nfcf(ddev, rf_tech);\nnet/nfc/digital_technology.c-1295-\t\tif (rc)\nnet/nfc/digital_technology.c-1296-\t\t\tgoto exit_free_skb;\nnet/nfc/digital_technology.c:1297:\t\tdigital_tg_recv_sensf_req(ddev, arg, resp);\nnet/nfc/digital_technology.c-1298-\t\tbreak;\n" }
31/2	2026/09/12 13:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 47862 output: 194 thoughts: 2054 Thoughts: Analysis of NFC Digital Target Mode Functionality for Fuzzing Okay, so I need to summarize this patch's implications for fuzzing, focusing on how the code modification impacts reachable and testable code paths. First, I see that `digital_tg_recv_dep_req` is the key function here. It's static void in `net/nfc/digital_dep.c`, which initially made me pause because static functions can sometimes be tricky for symbol coverage, but in this case, it is a static function within a `.c` file, and its address is taken, specifically as a callback: `digital_tg_send_cmd(..., digital_tg_recv_dep_req, ...)`. This is important. Because the address is taken, the compiler must generate a distinct symbol for this function, ensuring it's addressable. Looking deeper, I identified other related functions: `digital_tg_send_dep_res` (exported) and `digital_tg_recv_atr_req` (non-static) are also relevant. `digital_tg_recv_dep_req` is the direct target of the patch, and those are entry points that lead to it. I then considered reachability. Crucially, this isn't just theoretical code. The NFC stack is accessible in virtualized environments. `nfcsim` (the software simulator driver) provides a virtual NFC device that can reach this code, as does `port100` (emulated USB device) via syzkaller, which is standard for fuzzing raw USB gadget traffic. This code also touches the network, driver code, and so is executable. It's not unreachable hardware or a teardown callback. So, yes, the criteria for "WorthFuzzing" are met. Regarding build configurations, to build and run this code, I'd need: `NFC`, `NFC_DIGITAL`, `NFC_SIM`, and `NFC_PORT100`. And because LLCP is compiled into `nfc.o` if CONFIG_NFC is enabled, it should also be fuzzable, given its relation to NFC. Now, as for what is being altered, it's a critical check in the DEP request handler within `digital_tg_recv_dep_req`. The patch fixes a potential out-of-bounds read when processing DEP requests with a DID (Device Identifier). Before the patch, a buffer access was done without proper length checking. The patch adds `resp->len < size + 1`, validates `ddev->did`, and indexes with `resp->data[size]` to ensure that the read stays within buffer bounds. Fuzzing this will be crucial to verify correct parsing of DEP frames, especially those with DID and edge-case lengths, ensuring that the patch prevents regressions and potential state corruption due to out-of-bounds reads. The added checks are a perfect opportunity for fuzzing. My primary focus symbols for fuzzing will be: `digital_tg_recv_dep_req`, which is the modified function. But also including `digital_tg_send_dep_res` and `digital_tg_recv_atr_req` is important since they provide entrypoints and related functions. Finally, I've confirmed that the 'WorthFuzzing' decision is sound, the explanation is concise, the focus symbols are specific, and the configurations are clearly listed. I can now proceed to `set-results`.
32/2	2026/09/12 13:25	tool	set-results	0m Args: { "EnableConfigs": [ "NFC", "NFC_DIGITAL", "NFC_SIM", "NFC_PORT100" ], "FocusSymbols": [ "digital_tg_recv_dep_req", "digital_tg_send_dep_res", "digital_tg_recv_atr_req" ], "Reasoning": "The patch modifies input validation in the NFC digital target mode DEP request handling (digital_tg_recv_dep_req) to prevent out-of-bounds access when the DID bit is set by verifying frame length against expected size and correctly indexing resp-\u003edata. The code is reachable in virtualized environments via virtual NFC drivers (e.g. nfcsim) and emulated USB NFC dongles (port100), making it worth fuzzing for boundary issues and state transitions.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "NFC", "NFC_DIGITAL", "NFC_SIM", "NFC_PORT100" ], "FocusSymbols": [ "digital_tg_recv_dep_req", "digital_tg_send_dep_res", "digital_tg_recv_atr_req" ], "Reasoning": "The patch modifies input validation in the NFC digital target mode DEP request handling (digital_tg_recv_dep_req) to prevent out-of-bounds access when the DID bit is set by verifying frame length against expected size and correctly indexing resp-\u003edata. The code is reachable in virtualized environments via virtual NFC drivers (e.g. nfcsim) and emulated USB NFC dongles (port100), making it worth fuzzing for boundary issues and state transitions.", "WorthFuzzing": true }
33/1	2026/09/12 13:25	action	If	0m Args: { "WorthFuzzing": true } Results: null
34/2	2026/09/12 13:25	agent	kmsan-evaluator	0m Model: core Args: null Results: { "KMSANReasoning": "The patch fixes a potential out-of-bounds read in `digital_tg_recv_dep_req()` where `resp-\u003edata[3]` was read without first verifying that `resp-\u003elen` was at least `size + 1` (4 bytes). \n\nThis is a bounds-checking issue: accessing bytes beyond `resp-\u003elen` is an out-of-bounds access directly detectable by KASAN (e.g., slab-out-of-bounds on skb data). The change does not introduce any uninitialized stack or heap variables, does not expose uninitialized padding or struct fields to user space, and does not alter control flow based on uninitialized memory. Because standard KASAN fully covers this class of bugs and no uninitialized memory risks are introduced, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Instruction: You are an expert Linux kernel security engineer specializing in kernel memory error detectors (KASAN and KMSAN). Your job is to review the provided patch series and determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer) fuzzing session in addition to standard KASAN fuzzing. CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN: - Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable a comprehensive suite of debugging tools and sanitizers, including KASAN (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks. - KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap, or page allocations) and kernel-to-user memory info-leaks. Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN, LOCKDEP, OR OTHER STANDARD BUG DETECTORS. A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks that are detected ONLY by KMSAN. Look holistically at the patch series and surrounding code. Even if no direct uninitialized field accesses or new buffer allocations are added in the diff itself, a patch may alter control flow, bounds checking, or data length calculations in ways that change how the rest of the code operates on existing buffers (e.g. allowing uninitialized stack/heap memory to be read, copied to user space, or used in control flow). Do not hesitate to use your code access tools to inspect the surrounding code, called functions, and callers. Set NeedsKMSAN=true ONLY IF the patch introduces or modifies: 1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb attributes, ioctl output arguments, socket options, or BPF buffers) where fields or structure padding might not be fully initialized/zeroed. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths. 4. Bounds checks, lengths, or logic in a way that allows surrounding code to access uninitialized bytes of existing buffers. Set NeedsKMSAN=false IF: - The code changes primarily risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (these are already caught by KASAN, LOCKDEP, or standard bug detectors). - All stack/heap structures touched or introduced by the patch are fully zeroed or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied. - The patch does not introduce any risk of uninitialized memory usage or info-leaks. Use your code access tools to inspect the surrounding code if necessary, then provide detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch. Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit 1020f269e855667140bc04f83a96849909af75dd Author: syz-cluster <triage@syzkaller.com> Date: Sat Sep 12 13:23:30 2026 +0000 syz-cluster: applied patch under review diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c index 3982fa084737f..ae5407fca12d4 100644 --- a/net/nfc/digital_dep.c +++ b/net/nfc/digital_dep.c @@ -1117,12 +1117,12 @@ static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg, pfb = dep_req->pfb; if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { - if (ddev->did && (ddev->did == resp->data[3])) { - size++; - } else { + if (resp->len < size + 1 \|\| !ddev->did \|\| + ddev->did != resp->data[size]) { rc = -EIO; goto exit; } + size++; } else if (ddev->did) { rc = -EIO; goto exit;
35/3	2026/09/12 13:25	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2171 output: 39 thoughts: 184 Thoughts: Analyzing the NFC Digital DEP Code for Fuzzing Strategy Okay, so I need to figure out the right fuzzing approach for this patch to `net/nfc/digital_dep.c`. My initial thought is to assess whether I need the heavier hammer of KMSAN or if standard KASAN will do the job. This seems like a straightforward analysis, a de-framing task really, just determining the appropriate sanitizer configuration. No red flags here – I'm not dealing with malware generation or exploit analysis, purely code review. This is a benign, defensive QA task. Good, safe to proceed. First step is to dig into the code itself. I'll need to inspect `net/nfc/digital_dep.c` directly, probably using `read-file` or `grepper` to get at `digital_tg_recv_dep_req`. I need a clear understanding of what that function does to inform my decision.
36/3	2026/09/12 13:25	tool	read-file	0m Args: { "File": "net/nfc/digital_dep.c", "FirstLine": 1100, "LineCount": 50 } Results: { "Contents": "1100:\t\t\tgoto exit;\n1101:\t\t}\n1102:\t\n1103:\t\tif (resp-\u003elen \u003e ddev-\u003elocal_payload_max) {\n1104:\t\t\trc = -EMSGSIZE;\n1105:\t\t\tgoto exit;\n1106:\t\t}\n1107:\t\n1108:\t\tsize = sizeof(struct digital_dep_req_res);\n1109:\t\tdep_req = (struct digital_dep_req_res )resp-\u003edata;\n1110:\t\n1111:\t\tif (resp-\u003elen \u003c size \|\| dep_req-\u003edir != DIGITAL_NFC_DEP_FRAME_DIR_OUT \|\|\n1112:\t\t dep_req-\u003ecmd != DIGITAL_CMD_DEP_REQ) {\n1113:\t\t\trc = -EIO;\n1114:\t\t\tgoto exit;\n1115:\t\t}\n1116:\t\n1117:\t\tpfb = dep_req-\u003epfb;\n1118:\t\n1119:\t\tif (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {\n1120:\t\t\tif (resp-\u003elen \u003c size + 1 \|\| !ddev-\u003edid \|\|\n1121:\t\t\t ddev-\u003edid != resp-\u003edata[size]) {\n1122:\t\t\t\trc = -EIO;\n1123:\t\t\t\tgoto exit;\n1124:\t\t\t}\n1125:\t\t\tsize++;\n1126:\t\t} else if (ddev-\u003edid) {\n1127:\t\t\trc = -EIO;\n1128:\t\t\tgoto exit;\n1129:\t\t}\n1130:\t\n1131:\t\tif (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {\n1132:\t\t\trc = -EIO;\n1133:\t\t\tgoto exit;\n1134:\t\t}\n1135:\t\n1136:\t\tif (size \u003e resp-\u003elen) {\n1137:\t\t\trc = -EIO;\n1138:\t\t\tgoto exit;\n1139:\t\t}\n1140:\t\n1141:\t\tskb_pull(resp, size);\n1142:\t\n1143:\t\tswitch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {\n1144:\t\tcase DIGITAL_NFC_DEP_PFB_I_PDU:\n1145:\t\t\tpr_debug(\"DIGITAL_NFC_DEP_PFB_I_PDU\\n\");\n1146:\t\n1147:\t\t\tif (ddev-\u003eatn_count) {\n1148:\t\t\t\t/ The target has received (and replied to) at least one\n1149:\t\t\t\t * ATN DEP_REQ.\n" }
37/3	2026/09/12 13:25	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3310 output: 34 thoughts: 740 Thoughts: Analyzing a NFC Driver Patch Okay, let's break this down. First, I'm looking at this `diff` related to the `digital_dep.c` file. Right away, I see a potential issue: an out-of-bounds read. The original code was accessing `resp->data[3]` without properly checking if `resp->len` was large enough. Essentially, the code was vulnerable to a read past the end of the `resp` data buffer. It's subtle, but accessing `resp->data[3]` when the buffer length (`resp->len`) is only 3 is a recipe for disaster. It's a classic off-by-one error or similar. The fix is straightforward. They've added a bounds check: `resp->len < size + 1`. This immediately flags the issue if the buffer isn't large enough to accommodate the access. They've also cleaned up the conditional, explicitly checking for `!ddev->did` or a mismatch in the DID value. They are also using `resp->data[size]` instead of `resp->data[3]` now, which makes the logic more robust. This is a much better approach. Now, my mind is already thinking about whether this kind of bug would have been flagged by a memory sanitizer. Given that it's an out-of-bounds read, my immediate thought is KASAN. It's designed to catch these kinds of memory access violations. I need to confirm the conditions around `resp`, but I strongly suspect that if this bug was triggered under KASAN, it would have been flagged immediately. Let me quickly review the caller to see where `resp` comes from to solidify my conclusions.
38/3	2026/09/12 13:26	tool	grepper	0m Args: { "Expression": "digital_tg_recv_dep_req", "PathPrefix": "net/nfc/" } Results: { "Output": "net/nfc/digital_dep.c=106=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-107-\t\t\t\t struct sk_buff resp);\nnet/nfc/digital_dep.c:108:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-109-\t\t\t\t struct sk_buff resp);\n--\nnet/nfc/digital_dep.c=978=static int digital_tg_send_ack(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1012-\nnet/nfc/digital_dep.c:1013:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1014-\t\t\t\t data_exch);\n--\nnet/nfc/digital_dep.c=1024=static int digital_tg_send_atn(struct nfc_digital_dev ddev)\n--\nnet/nfc/digital_dep.c-1051-\nnet/nfc/digital_dep.c:1052:\trc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1053-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c=1060=static int digital_tg_send_saved_skb(struct nfc_digital_dev ddev)\n--\nnet/nfc/digital_dep.c-1069-\trc = digital_tg_send_cmd(ddev, ddev-\u003esaved_skb, 1500,\nnet/nfc/digital_dep.c:1070:\t\t\t\t digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1071-\tif (rc)\n--\nnet/nfc/digital_dep.c-1076-\nnet/nfc/digital_dep.c:1077:static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\nnet/nfc/digital_dep.c-1078-\t\t\t\t struct sk_buff resp)\n--\nnet/nfc/digital_dep.c=1297=int digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\n--\nnet/nfc/digital_dep.c-1331-\nnet/nfc/digital_dep.c:1332:\trc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req,\nnet/nfc/digital_dep.c-1333-\t\t\t\t NULL);\n--\nnet/nfc/digital_dep.c=1348=static void digital_tg_send_psl_res_complete(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1359-\nnet/nfc/digital_dep.c:1360:\tdigital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);\nnet/nfc/digital_dep.c-1361-\n--\nnet/nfc/digital_dep.c=1467=static void digital_tg_send_atr_res_complete(struct nfc_digital_dev ddev,\n--\nnet/nfc/digital_dep.c-1485-\telse\nnet/nfc/digital_dep.c:1486:\t\tdigital_tg_recv_dep_req(ddev, arg, resp);\nnet/nfc/digital_dep.c-1487-}\n" }
39/3	2026/09/12 13:26	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5470 output: 39 thoughts: 78 Thoughts: Here's my analysis of the provided code snippet, focusing on the `digital_tg_recv_dep_req` function: Analyzing the Data Transfer in `digital_tg_recv_dep_req` Okay, so we're looking at `digital_tg_recv_dep_req`, specifically the handling of a received `skb` (socket buffer) that represents a response to a target DEP (Data Execution Prevention) request. The crucial question here is whether this function copies any data from the kernel space to user space, because that is often where memory issues arise. I need to be diligent about where the data flow is occurring. To get a definitive answer, I'm going to dive into the code. I'll focus my attention on lines 1140 through 1290 of `digital_dep.c`. This range should contain the core logic for processing the incoming response and, critically, any data transfer operations related to DEP requests. I'll be looking specifically for calls that indicate user-space data copies such as `copy_to_user()` or other functions that perform a similar role. Any direct interaction with user-space memory within that function range will be interesting.
40/3	2026/09/12 13:26	tool	read-file	0m Args: { "File": "net/nfc/digital_dep.c", "FirstLine": 1140, "LineCount": 80 } Results: { "Contents": "1140:\t\n1141:\t\tskb_pull(resp, size);\n1142:\t\n1143:\t\tswitch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {\n1144:\t\tcase DIGITAL_NFC_DEP_PFB_I_PDU:\n1145:\t\t\tpr_debug(\"DIGITAL_NFC_DEP_PFB_I_PDU\\n\");\n1146:\t\n1147:\t\t\tif (ddev-\u003eatn_count) {\n1148:\t\t\t\t/* The target has received (and replied to) at least one\n1149:\t\t\t\t * ATN DEP_REQ.\n1150:\t\t\t\t /\n1151:\t\t\t\tddev-\u003eatn_count = 0;\n1152:\t\n1153:\t\t\t\t/ pni of resp PDU equal to the target current pni - 1\n1154:\t\t\t\t * means resp is the previous DEP_REQ PDU received from\n1155:\t\t\t\t * the initiator so the target replies with saved_skb\n1156:\t\t\t\t * which is the previous DEP_RES saved in\n1157:\t\t\t\t * digital_tg_send_dep_res().\n1158:\t\t\t\t /\n1159:\t\t\t\tif (DIGITAL_NFC_DEP_PFB_PNI(pfb) ==\n1160:\t\t\t\t DIGITAL_NFC_DEP_PFB_PNI(ddev-\u003ecurr_nfc_dep_pni - 1)) {\n1161:\t\t\t\t\trc = digital_tg_send_saved_skb(ddev);\n1162:\t\t\t\t\tif (rc)\n1163:\t\t\t\t\t\tgoto exit;\n1164:\t\n1165:\t\t\t\t\tgoto free_resp;\n1166:\t\t\t\t}\n1167:\t\n1168:\t\t\t\t/ atn_count \u003e 0 and PDU pni != curr_nfc_dep_pni - 1\n1169:\t\t\t\t * means the target probably did not received the last\n1170:\t\t\t\t * DEP_REQ PDU sent by the initiator. The target\n1171:\t\t\t\t * fallbacks to normal processing then.\n1172:\t\t\t\t /\n1173:\t\t\t}\n1174:\t\n1175:\t\t\tif (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev-\u003ecurr_nfc_dep_pni) {\n1176:\t\t\t\tPROTOCOL_ERR(\"14.12.3.4\");\n1177:\t\t\t\trc = -EIO;\n1178:\t\t\t\tgoto exit;\n1179:\t\t\t}\n1180:\t\n1181:\t\t\tkfree_skb(ddev-\u003esaved_skb);\n1182:\t\t\tddev-\u003esaved_skb = NULL;\n1183:\t\n1184:\t\t\tresp = digital_recv_dep_data_gather(ddev, pfb, resp,\n1185:\t\t\t\t\t\t\t digital_tg_send_ack, NULL);\n1186:\t\t\tif (IS_ERR(resp)) {\n1187:\t\t\t\trc = PTR_ERR(resp);\n1188:\t\t\t\tresp = NULL;\n1189:\t\t\t\tgoto exit;\n1190:\t\t\t}\n1191:\t\n1192:\t\t\t/ If resp is NULL then we're still chaining so return and\n1193:\t\t\t * wait for the next part of the PDU. Else, the PDU is\n1194:\t\t\t * complete so pass it up.\n1195:\t\t\t /\n1196:\t\t\tif (!resp)\n1197:\t\t\t\treturn;\n1198:\t\n1199:\t\t\trc = 0;\n1200:\t\t\tbreak;\n1201:\t\tcase DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:\n1202:\t\t\tif (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { / NACK /\n1203:\t\t\t\tif (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) !=\n1204:\t\t\t\t\t\t\tddev-\u003ecurr_nfc_dep_pni) {\n1205:\t\t\t\t\trc = -EIO;\n1206:\t\t\t\t\tgoto exit;\n1207:\t\t\t\t}\n1208:\t\n1209:\t\t\t\tddev-\u003eatn_count = 0;\n1210:\t\n1211:\t\t\t\trc = digital_tg_send_saved_skb(ddev);\n1212:\t\t\t\tif (rc)\n1213:\t\t\t\t\tgoto exit;\n1214:\t\n1215:\t\t\t\tgoto free_resp;\n1216:\t\t\t}\n1217:\t\n1218:\t\t\t/ ACK */\n1219:\t\t\tif (ddev-\u003eatn_count) {\n" }
41/3	2026/09/12 13:26	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7064 output: 39 thoughts: 19 Thoughts: Okay, here's my attempt at summarizing the thought process, as requested, in the first person and targeted towards an expert: Deep Dive into `digital_tg_recv_dep_req` Alright, let's get down to brass tacks. I need to figure out what's going on next within this `digital_tg_recv_dep_req` function. It's the lynchpin, isn't it? The starting point of an important process. I need to consider all angles and ensure nothing is missed that would impact the design of the wider system. I'm thinking, "what are the most important areas to be investigated?". It looks to me like it's primarily responsible for handling some sort of dependency request within the digital signal processing chain. Given its name, I'm assuming it's related to some digital transmission group. We have to consider factors relating to its reception and processing within this function. What are the likely data structures being used here? Is it a straightforward buffer, or something more complex with metadata? Are there any error conditions that need to be accounted for? What happens if the request is malformed or invalid? Does it immediately return an error code or does it trigger a specific kind of callback or event? Is there a state machine that I need to be aware of? Are there concurrency considerations that I need to keep in mind, i.e. is this function called from multiple threads? I also need to understand its relationship to the rest of the system. What other functions or modules does `digital_tg_recv_dep_req` call, and which ones call it? What are the implications of these calls in terms of resource utilization and latency? Does it interact with any hardware directly? And, if so, are there any hardware-specific considerations in terms of timing or synchronization? I'll probably need to trace its call stack and data flow to get a complete picture. This is my chance to determine if this piece of code is efficient and well-designed, or if there's room for improvement. Ultimately, I want to form an accurate mental model of what this function does and how it fits into the overall scheme of things. I'm looking for the key insights that will inform my understanding of the system's design and will determine how I will approach this problem. Let's dig in and see what secrets this function holds.
42/3	2026/09/12 13:26	tool	read-file	0m Args: { "File": "net/nfc/digital_dep.c", "FirstLine": 1220, "LineCount": 80 } Results: { "Contents": "1220:\t\t\t\t/* The target has previously received one or more ATN\n1221:\t\t\t\t * PDUs.\n1222:\t\t\t\t /\n1223:\t\t\t\tddev-\u003eatn_count = 0;\n1224:\t\n1225:\t\t\t\t/ If the ACK PNI is equal to the target PNI - 1 means\n1226:\t\t\t\t * that the initiator did not receive the previous PDU\n1227:\t\t\t\t * sent by the target so re-send it.\n1228:\t\t\t\t /\n1229:\t\t\t\tif (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) ==\n1230:\t\t\t\t\t\t\tddev-\u003ecurr_nfc_dep_pni) {\n1231:\t\t\t\t\trc = digital_tg_send_saved_skb(ddev);\n1232:\t\t\t\t\tif (rc)\n1233:\t\t\t\t\t\tgoto exit;\n1234:\t\n1235:\t\t\t\t\tgoto free_resp;\n1236:\t\t\t\t}\n1237:\t\n1238:\t\t\t\t/ Otherwise, the target did not receive the previous\n1239:\t\t\t\t * ACK PDU from the initiator. Fallback to normal\n1240:\t\t\t\t * processing of chained PDU then.\n1241:\t\t\t\t /\n1242:\t\t\t}\n1243:\t\n1244:\t\t\t/ Keep on sending chained PDU /\n1245:\t\t\tif (!ddev-\u003echaining_skb \|\|\n1246:\t\t\t DIGITAL_NFC_DEP_PFB_PNI(pfb) !=\n1247:\t\t\t\t\t\tddev-\u003ecurr_nfc_dep_pni) {\n1248:\t\t\t\trc = -EIO;\n1249:\t\t\t\tgoto exit;\n1250:\t\t\t}\n1251:\t\n1252:\t\t\tkfree_skb(ddev-\u003esaved_skb);\n1253:\t\t\tddev-\u003esaved_skb = NULL;\n1254:\t\n1255:\t\t\trc = digital_tg_send_dep_res(ddev, ddev-\u003echaining_skb);\n1256:\t\t\tif (rc)\n1257:\t\t\t\tgoto exit;\n1258:\t\n1259:\t\t\tgoto free_resp;\n1260:\t\tcase DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:\n1261:\t\t\tif (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) {\n1262:\t\t\t\trc = -EINVAL;\n1263:\t\t\t\tgoto exit;\n1264:\t\t\t}\n1265:\t\n1266:\t\t\trc = digital_tg_send_atn(ddev);\n1267:\t\t\tif (rc)\n1268:\t\t\t\tgoto exit;\n1269:\t\n1270:\t\t\tddev-\u003eatn_count++;\n1271:\t\n1272:\t\t\tgoto free_resp;\n1273:\t\t}\n1274:\t\n1275:\t\trc = nfc_tm_data_received(ddev-\u003enfc_dev, resp);\n1276:\t\tif (rc)\n1277:\t\t\tresp = NULL;\n1278:\t\n1279:\texit:\n1280:\t\tkfree_skb(ddev-\u003echaining_skb);\n1281:\t\tddev-\u003echaining_skb = NULL;\n1282:\t\n1283:\t\tddev-\u003eatn_count = 0;\n1284:\t\n1285:\t\tkfree_skb(ddev-\u003esaved_skb);\n1286:\t\tddev-\u003esaved_skb = NULL;\n1287:\t\n1288:\t\tif (rc)\n1289:\t\t\tkfree_skb(resp);\n1290:\t\n1291:\t\treturn;\n1292:\t\n1293:\tfree_resp:\n1294:\t\tdev_kfree_skb(resp);\n1295:\t}\n1296:\t\n1297:\tint digital_tg_send_dep_res(struct nfc_digital_dev ddev, struct sk_buff skb)\n1298:\t{\n1299:\t\tstruct digital_dep_req_res dep_res;\n" }
43/3	2026/09/12 13:26	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8731 output: 38 thoughts: 333 Thoughts: Analyzing the NFC Digital DEP DID Handling Okay, let's break this down. I'm looking at a patch in `net/nfc/digital_dep.c` concerning DID (Data ID) handling within the Digital DEP (Device-to-Device Protocol) for NFC. The core of this seems to be centered around `digital_tg_recv_dep_req` and the verification of the DID field within a received DEP request. Essentially, it checks if a DID is present (`DIGITAL_NFC_DEP_DID_BIT_SET`) in the Protocol Format Byte (PFB) and then compares it to the device's expected DID (`ddev->did`). The original code had a subtle flaw that this patch aims to fix. I need to understand that flaw, as the logic is somewhat convoluted. Here's the problem I see now: The initial conditional statement in the `if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb))` block used to verify the DID. The original code incremented `size++` if the DIDs matched but, if the DIDs did not match, it would error out and exit. This works as intended. The patch aims to solve a case where if the `resp->len` is too small, an out-of-bounds read would happen and a crash could occur. The patch fixes this by checking `resp->len < size + 1` before comparing the DID. The other part of the fix is to simplify the `else` clause: if a DID is expected but not present, error out. Now, let's switch gears and check how `digital_in_recv_dep_res` does the DID checking, to make sure this fix is consistent across the codebase. I need to confirm that the changes made here are also reflected (or considered) in the incoming response side of things. It's crucial for symmetrical behavior to maintain data integrity.
44/3	2026/09/12 13:26	tool	grepper	0m Args: { "Expression": "DIGITAL_NFC_DEP_DID_BIT_SET", "PathPrefix": "net/nfc/" } Results: { "Output": "net/nfc/digital_dep.c-52-#define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) \u0026 0x08)\nnet/nfc/digital_dep.c:53:#define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) \u0026 DIGITAL_NFC_DEP_PFB_DID_BIT)\nnet/nfc/digital_dep.c-54-#define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) \u0026 0x03)\n--\nnet/nfc/digital_dep.c=686=static void digital_in_recv_dep_res(struct nfc_digital_dev ddev, void arg,\n--\nnet/nfc/digital_dep.c-766-\nnet/nfc/digital_dep.c:767:\tif (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {\nnet/nfc/digital_dep.c-768-\t\tPROTOCOL_ERR(\"14.8.2.1\");\n--\nnet/nfc/digital_dep.c=1077=static void digital_tg_recv_dep_req(struct nfc_digital_dev ddev, void arg,\n--\nnet/nfc/digital_dep.c-1118-\nnet/nfc/digital_dep.c:1119:\tif (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {\nnet/nfc/digital_dep.c-1120-\t\tif (resp-\u003elen \u003c size + 1 \|\| !ddev-\u003edid \|\|\n" }
45/3	2026/09/12 13:26	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9930 output: 199 thoughts: 1143 Thoughts: Analyzing the Patch for KMSAN Relevance Alright, let's break this down. The commit fixes what looks like a classic out-of-bounds read vulnerability. Syzkaller probably found it, specifically, accessing `resp->data[3]` when `resp->len` was only 3. The `size` variable is set to the size of `struct digital_dep_req_res`, which is 3 bytes, but the conditional check before the fix only checked for `resp->len >= 3`. Then, if a certain bit was set, the code attempted to access `resp->data[3]`. If `resp->len` was exactly 3, that's a one-byte out-of-bounds read from the end of the `resp->data` buffer. KASAN would immediately catch that. Now, the question is, does this require KMSAN? Let's go through the checklist. 1. User-space exposure? Nope. Nothing here gets copied to user space. 2. Uninitialized variable shenanigans? Not at all. `resp->len`, `size`, `ddev->did`, and the specific byte of `resp->data` are all well-defined and initialized. `size` is an integer initialized with `sizeof()`. `resp->data` is just the NFC packet that was received. 3. New allocations or data structures? No new allocations or modifications to data structure initializations are added or modified by the patch. 4. Bounds checks exposing uninitialized bytes? Actually, the patch tightens bounds checks. It adds an extra check (`resp->len < size + 1`) to ensure we don't read out-of-bounds. The code is restricting access, not expanding it. Wait, is there any chance that `resp->data[size]` could be uninitialized memory? No. The code explicitly checks `resp->len` before accessing the data. Even if `resp->data` is an skb data buffer, the code checks the length of valid received data, which is indicated by `resp->len`. Before the patch, attempting to read past the value of `resp->len` was an out-of-bounds read (caught by KASAN), the patch has fixed this and now the code does not read past the allocated buffer. The patch fixes this by checking `resp->len < size + 1`. The change modifies bounds checking in a way that restricts access. The core of the problem here was a KASAN detectable out-of-bounds read, and the patch fixes it by implementing a proper bounds check, not by exposing any uninitialized memory. So, according to the rules, since KASAN handles the type of bug this patch addresses, and the patch doesn't introduce uninitialized memory risks, this doesn't need KMSAN. This patch falls into the category of "primarily risks out-of-bounds access, array overflows, ... (these are already caught by KASAN)". The structures are fully initialized or checked. Therefore, `NeedsKMSAN = false`. It is a classic KASAN issue. The patch adds a length check and doesn't do anything else. Let's prepare the justification, contrasting KASAN and KMSAN. In the `digital_tg_recv_dep_req()` function, the driver handles incoming NFC DEP requests. Previously, when the DID bit in the PFB byte was set, it unconditionally checked `resp->data[3]` without ensuring `resp->len >= 4` (since the prior check only ensured `resp->len >= 3`), leading to a potential 1-byte out-of-bounds read. Out-of-bounds read detection on slab/skb buffers is handled directly by KASAN (e.g., slab-out-of-bounds). The patch does not introduce or expose uninitialized memory, does not alter structures copied to userspace, does not leave any variables uninitialized, and actually tightens length validation on incoming data before indexing the buffer. No uninitialized memory reads or information leaks are introduced or exposed. Therefore, `NeedsKMSAN=false`. Let's call `set-results`.
46/3	2026/09/12 13:26	tool	set-results	0m Args: { "KMSANReasoning": "The patch fixes a potential out-of-bounds read in `digital_tg_recv_dep_req()` where `resp-\u003edata[3]` was read without first verifying that `resp-\u003elen` was at least `size + 1` (4 bytes). \n\nThis is a bounds-checking issue: accessing bytes beyond `resp-\u003elen` is an out-of-bounds access directly detectable by KASAN (e.g., slab-out-of-bounds on skb data). The change does not introduce any uninitialized stack or heap variables, does not expose uninitialized padding or struct fields to user space, and does not alter control flow based on uninitialized memory. Because standard KASAN fully covers this class of bugs and no uninitialized memory risks are introduced, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch fixes a potential out-of-bounds read in `digital_tg_recv_dep_req()` where `resp-\u003edata[3]` was read without first verifying that `resp-\u003elen` was at least `size + 1` (4 bytes). \n\nThis is a bounds-checking issue: accessing bytes beyond `resp-\u003elen` is an out-of-bounds access directly detectable by KASAN (e.g., slab-out-of-bounds on skb data). The change does not introduce any uninitialized stack or heap variables, does not expose uninitialized padding or struct fields to user space, and does not alter control flow based on uninitialized memory. Because standard KASAN fully covers this class of bugs and no uninitialized memory risks are introduced, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false }

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)