AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/09/16 21:42	flow	patch-triage	1m Args: null Results: { "EnableConfigs": [ "USB_STORAGE", "USB", "SCSI" ], "FocusSymbols": [ "sierra_get_swoc_info", "sierra_ms_init", "truinst_show" ], "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false, "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.", "WorthFuzzing": true }
1/1	2026/09/16 21:42	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 8176a97483e2ad011dcc3443b1fcdd8fc17fc6d7\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Sep 16 21:42:05 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c\nindex 177fa6cd143ab..8755fda42eed2 100644\n--- a/drivers/usb/storage/sierra_ms.c\n+++ b/drivers/usb/storage/sierra_ms.c\n@@ -76,6 +76,12 @@ static int sierra_get_swoc_info(struct usb_device udev,\n \t\t\t(void ) swocInfo,\t\t/* void data /\n \t\t\tsizeof(struct swoc_info),\t/* __u16 size \t /\n \t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/ int timeout \t /\n+\t/\n+\t * A short IN transfer leaves the tail of swocInfo uninitialized;\n+\t * only a full transfer is valid.\n+\t */\n+\tif (result != sizeof(struct swoc_info))\n+\t\treturn -EIO;\n \n \tswocInfo-\u003eLinuxSKU = le16_to_cpu(swocInfo-\u003eLinuxSKU);\n \tswocInfo-\u003eLinuxVer = le16_to_cpu(swocInfo-\u003eLinuxVer);\n" }
2/1	2026/09/16 21:42	agent	patch-evaluator	1m Model: core Args: null Results: { "EnableConfigs": [ "USB_STORAGE", "USB", "SCSI" ], "FocusSymbols": [ "sierra_get_swoc_info", "sierra_ms_init", "truinst_show" ], "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.", "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 8176a97483e2ad011dcc3443b1fcdd8fc17fc6d7 Author: syz-cluster <triage@syzkaller.com> Date: Wed Sep 16 21:42:05 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c index 177fa6cd143ab..8755fda42eed2 100644 --- a/drivers/usb/storage/sierra_ms.c +++ b/drivers/usb/storage/sierra_ms.c @@ -76,6 +76,12 @@ static int sierra_get_swoc_info(struct usb_device udev, (void ) swocInfo, /* void data / sizeof(struct swoc_info), /* __u16 size / USB_CTRL_SET_TIMEOUT); / int timeout / + / + * A short IN transfer leaves the tail of swocInfo uninitialized; + * only a full transfer is valid. + */ + if (result != sizeof(struct swoc_info)) + return -EIO; swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU); swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer);
3/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2958 output: 39 thoughts: 338 Thoughts: Analyzing a Linux Kernel Patch Okay, so I've been asked to review a patch for `drivers/usb/storage/sierra_ms.c`. My initial thought is to get the lay of the land, understand the "why" of this change. It seems to be related to the `sierra_get_swoc_info` function, which deals with retrieving some sort of Software Object Code (SWOC) information from a USB device. The core of the patch is a check on the result of a USB control transfer. Specifically, it's adding an error check after the `usb_control_msg` call. Looking closer, the comment provides the key insight: a short IN transfer, that is one that returns fewer bytes than expected, leaves parts of the `swocInfo` structure uninitialized. The patch is then adding a check for the result of the transfer, ensuring it's the expected size (`sizeof(struct swoc_info)`). If not, it returns `-EIO`, which signals an Input/Output error. This is a good defensive programming approach, preventing the driver from potentially using uninitialized data, or worse, corrupted data. I'll want to use `git blame` and cross-reference with any relevant bug reports or mailing list discussions to understand the original problem this patch addresses. I'd like to also look into similar functions in this driver and other USB storage drivers to see if similar error handling patterns are present. It's possible this check should be generalized somehow. Finally, I'll need to think about potential side effects or edge cases, like what happens if this check fails in practice? What would be the implications on the user?
4/2	2026/09/16 21:42	tool	read-file	0m Args: { "File": "drivers/usb/storage/sierra_ms.c", "FirstLine": 50, "LineCount": 70 } Results: { "Contents": " 50:\t\tint result;\n 51:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: %s\", \"DEVICE MODE SWITCH\\n\");\n 52:\t\tresult = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),\n 53:\t\t\t\tSWIMS_USB_REQUEST_SetSwocMode,\t/* __u8 request /\n 54:\t\t\t\tUSB_TYPE_VENDOR \| USB_DIR_OUT,\t/ __u8 request type /\n 55:\t\t\t\teSWocMode,\t\t\t/ __u16 value /\n 56:\t\t\t\t0x0000,\t\t\t\t/ __u16 index /\n 57:\t\t\t\tNULL,\t\t\t\t/ void data /\n 58:\t\t\t\t0,\t\t\t\t/* __u16 size \t /\n 59:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/ int timeout /\n 60:\t\treturn result;\n 61:\t}\n 62:\t\n 63:\t\n 64:\tstatic int sierra_get_swoc_info(struct usb_device udev,\n 65:\t\t\t\t\tstruct swoc_info swocInfo)\n 66:\t{\n 67:\t\tint result;\n 68:\t\n 69:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: Attempting to get TRU-Install info\\n\");\n 70:\t\n 71:\t\tresult = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),\n 72:\t\t\t\tSWIMS_USB_REQUEST_GetSwocInfo,\t/ __u8 request /\n 73:\t\t\t\tUSB_TYPE_VENDOR \| USB_DIR_IN,\t/ __u8 request type /\n 74:\t\t\t\t0,\t\t\t\t/ __u16 value /\n 75:\t\t\t\t0,\t\t\t\t/ __u16 index /\n 76:\t\t\t\t(void ) swocInfo,\t\t/* void data /\n 77:\t\t\t\tsizeof(struct swoc_info),\t/* __u16 size \t /\n 78:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/ int timeout \t /\n 79:\t\t/\n 80:\t\t * A short IN transfer leaves the tail of swocInfo uninitialized;\n 81:\t\t * only a full transfer is valid.\n 82:\t\t /\n 83:\t\tif (result != sizeof(struct swoc_info))\n 84:\t\t\treturn -EIO;\n 85:\t\n 86:\t\tswocInfo-\u003eLinuxSKU = le16_to_cpu(swocInfo-\u003eLinuxSKU);\n 87:\t\tswocInfo-\u003eLinuxVer = le16_to_cpu(swocInfo-\u003eLinuxVer);\n 88:\t\treturn result;\n 89:\t}\n 90:\t\n 91:\tstatic void debug_swoc(const struct device dev, struct swoc_info swocInfo)\n 92:\t{\n 93:\t\tdev_dbg(dev, \"SWIMS: SWoC Rev: %02d\\n\", swocInfo-\u003erev);\n 94:\t\tdev_dbg(dev, \"SWIMS: Linux SKU: %04X\\n\", swocInfo-\u003eLinuxSKU);\n 95:\t\tdev_dbg(dev, \"SWIMS: Linux Version: %04X\\n\", swocInfo-\u003eLinuxVer);\n 96:\t}\n 97:\t\n 98:\t\n 99:\tstatic ssize_t truinst_show(struct device dev, struct device_attribute attr,\n 100:\t\t\t\tchar buf)\n 101:\t{\n 102:\t\tstruct swoc_info swocInfo;\n 103:\t\tstruct usb_interface intf = to_usb_interface(dev);\n 104:\t\tstruct usb_device *udev = interface_to_usbdev(intf);\n 105:\t\tint result;\n 106:\t\tif (swi_tru_install == TRU_FORCE_MS) {\n 107:\t\t\tresult = sysfs_emit(buf, \"Forced Mass Storage\\n\");\n 108:\t\t} else {\n 109:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);\n 110:\t\t\tif (!swocInfo) {\n 111:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 112:\t\t\t\treturn -ENOMEM;\n 113:\t\t\t}\n 114:\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 115:\t\t\tif (result \u003c 0) {\n 116:\t\t\t\tdev_dbg(dev, \"SWIMS: failed SWoC query\\n\");\n 117:\t\t\t\tkfree(swocInfo);\n 118:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 119:\t\t\t\treturn -EIO;\n" }
5/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 4904 output: 38 thoughts: 37 Thoughts: Okay, let's dive into this code. Analyzing the Call Sites of `sierra_get_swoc_info` Alright, my immediate thought is to understand the context of `sierra_get_swoc_info`. Where is it being used? To gain that understanding, I'll start by tracing its call sites. My initial plan is to zoom in on the code between lines 1 and 50, then skip ahead to lines 120 through 200. This should provide a reasonable overview of the function's usage, and likely give me some important clues about how it interacts with other components of this system. I suspect a quick scan of these sections will give me the essential pieces of information for further analysis. I am looking for the logical flow of the program and the data it deals with.
6/2	2026/09/16 21:42	tool	read-file	0m Args: { "File": "drivers/usb/storage/sierra_ms.c", "FirstLine": 1, "LineCount": 50 } Results: { "Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t#include \u003cscsi/scsi.h\u003e\n 3:\t#include \u003cscsi/scsi_host.h\u003e\n 4:\t#include \u003cscsi/scsi_cmnd.h\u003e\n 5:\t#include \u003cscsi/scsi_device.h\u003e\n 6:\t#include \u003clinux/usb.h\u003e\n 7:\t#include \u003clinux/module.h\u003e\n 8:\t#include \u003clinux/slab.h\u003e\n 9:\t\n 10:\t#include \"usb.h\"\n 11:\t#include \"transport.h\"\n 12:\t#include \"protocol.h\"\n 13:\t#include \"scsiglue.h\"\n 14:\t#include \"sierra_ms.h\"\n 15:\t#include \"debug.h\"\n 16:\t\n 17:\t#define SWIMS_USB_REQUEST_SetSwocMode\t0x0B\n 18:\t#define SWIMS_USB_REQUEST_GetSwocInfo\t0x0A\n 19:\t#define SWIMS_USB_INDEX_SetMode\t\t0x0000\n 20:\t#define SWIMS_SET_MODE_Modem\t\t0x0001\n 21:\t\n 22:\t#define TRU_NORMAL \t\t\t0x01\n 23:\t#define TRU_FORCE_MS \t\t\t0x02\n 24:\t#define TRU_FORCE_MODEM \t\t0x03\n 25:\t\n 26:\tstatic unsigned int swi_tru_install = 1;\n 27:\tmodule_param(swi_tru_install, uint, S_IRUGO \| S_IWUSR);\n 28:\tMODULE_PARM_DESC(swi_tru_install, \"TRU-Install mode (1=Full Logic (def),\"\n 29:\t\t\t \" 2=Force CD-Rom, 3=Force Modem)\");\n 30:\t\n 31:\tstruct swoc_info {\n 32:\t\t__u8 rev;\n 33:\t\t__u8 reserved[8];\n 34:\t\t__u16 LinuxSKU;\n 35:\t\t__u16 LinuxVer;\n 36:\t\t__u8 reserved2[47];\n 37:\t} __attribute__((__packed__));\n 38:\t\n 39:\tstatic bool containsFullLinuxPackage(struct swoc_info swocInfo)\n 40:\t{\n 41:\t\tif ((swocInfo-\u003eLinuxSKU \u003e= 0x2100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x2FFF) \|\|\n 42:\t\t (swocInfo-\u003eLinuxSKU \u003e= 0x7100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x7FFF))\n 43:\t\t\treturn true;\n 44:\t\telse\n 45:\t\t\treturn false;\n 46:\t}\n 47:\t\n 48:\tstatic int sierra_set_ms_mode(struct usb_device udev, __u16 eSWocMode)\n 49:\t{\n 50:\t\tint result;\n" }
7/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5962 output: 41 thoughts: 10 Thoughts: Okay, here's my attempt at summarizing the thought process, tailored for an expert audience, and written in the first person: Navigating the Script Alright, I've got the initial snippet, but I need to get a handle on the broader context. My immediate instinct is to delve deeper. I need to understand the complete scope of this file before I can draw any concrete conclusions. I'm thinking, let's parse the rest of it. There could be critical dependencies or conflicting ideas further along that will change my initial interpretation. Going forward blindly would be risky at this point. I need to avoid jumping to assumptions and make an informed decision by taking a look at everything.
8/2	2026/09/16 21:42	tool	read-file	0m Args: { "File": "drivers/usb/storage/sierra_ms.c", "FirstLine": 120, "LineCount": 100 } Results: { "Contents": " 120:\t\t\t}\n 121:\t\t\tdebug_swoc(dev, swocInfo);\n 122:\t\t\tresult = sysfs_emit(buf,\n 123:\t\t\t\t\t \"REV=%02d SKU=%04X VER=%04X\\n\",\n 124:\t\t\t\t\t swocInfo-\u003erev,\n 125:\t\t\t\t\t swocInfo-\u003eLinuxSKU,\n 126:\t\t\t\t\t swocInfo-\u003eLinuxVer);\n 127:\t\t\tkfree(swocInfo);\n 128:\t\t}\n 129:\t\treturn result;\n 130:\t}\n 131:\tstatic DEVICE_ATTR_RO(truinst);\n 132:\t\n 133:\tint sierra_ms_init(struct us_data us)\n 134:\t{\n 135:\t\tint result, retries;\n 136:\t\tstruct swoc_info swocInfo;\n 137:\t\tstruct usb_device udev;\n 138:\t\n 139:\t\tudev = us-\u003epusb_dev;\n 140:\t\n 141:\t\t/ Force Modem mode /\n 142:\t\tif (swi_tru_install == TRU_FORCE_MODEM) {\n 143:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Modem Mode\\n\");\n 144:\t\t\tresult = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem);\n 145:\t\t\tif (result \u003c 0)\n 146:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed to switch to modem mode\\n\");\n 147:\t\t\treturn -EIO;\n 148:\t\t}\n 149:\t\t/ Force Mass Storage mode (keep CD-Rom) /\n 150:\t\telse if (swi_tru_install == TRU_FORCE_MS) {\n 151:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Mass Storage Mode\\n\");\n 152:\t\t\tgoto complete;\n 153:\t\t}\n 154:\t\t/ Normal TRU-Install Logic /\n 155:\t\telse {\n 156:\t\t\tusb_stor_dbg(us, \"SWIMS: Normal SWoC Logic\\n\");\n 157:\t\n 158:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info),\n 159:\t\t\t\t\tGFP_KERNEL);\n 160:\t\t\tif (!swocInfo)\n 161:\t\t\t\treturn -ENOMEM;\n 162:\t\n 163:\t\t\tretries = 3;\n 164:\t\t\tdo {\n 165:\t\t\t\tretries--;\n 166:\t\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 167:\t\t\t\tif (result \u003c 0) {\n 168:\t\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed SWoC query\\n\");\n 169:\t\t\t\t\tschedule_timeout_uninterruptible(2HZ);\n 170:\t\t\t\t}\n 171:\t\t\t} while (retries \u0026\u0026 result \u003c 0);\n 172:\t\n 173:\t\t\tif (result \u003c 0) {\n 174:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Completely failed SWoC query\\n\");\n 175:\t\t\t\tkfree(swocInfo);\n 176:\t\t\t\treturn -EIO;\n 177:\t\t\t}\n 178:\t\n 179:\t\t\tdebug_swoc(\u0026us-\u003epusb_dev-\u003edev, swocInfo);\n 180:\t\n 181:\t\t\t/\n 182:\t\t\t If there is not Linux software on the TRU-Install device\n 183:\t\t\t * then switch to modem mode\n 184:\t\t\t */\n 185:\t\t\tif (!containsFullLinuxPackage(swocInfo)) {\n 186:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Switching to Modem Mode\\n\");\n 187:\t\t\t\tresult = sierra_set_ms_mode(udev,\n 188:\t\t\t\t\tSWIMS_SET_MODE_Modem);\n 189:\t\t\t\tif (result \u003c 0)\n 190:\t\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed to switch modem\\n\");\n 191:\t\t\t\tkfree(swocInfo);\n 192:\t\t\t\treturn -EIO;\n 193:\t\t\t}\n 194:\t\t\tkfree(swocInfo);\n 195:\t\t}\n 196:\tcomplete:\n 197:\t\treturn device_create_file(\u0026us-\u003epusb_intf-\u003edev, \u0026dev_attr_truinst);\n 198:\t}\n 199:\t\n" }
9/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7363 output: 20 thoughts: 14 Thoughts: Here's my take on those thoughts: Tracing the Lineage of `sierra_ms_init` Alright, let's get down to brass tacks. I need to understand the control flow here, specifically how the `sierra_ms_init` function gets invoked. My goal is to map out its role within the larger system. Time to crack open the source code and start tracing those calls. I want to see exactly where `sierra_ms_init` is called from. This is the first step in understanding its dependencies and impact.
10/2	2026/09/16 21:42	tool	grepper	0m Args: { "Expression": "sierra_ms_init" } Results: { "Output": "drivers/usb/storage/sierra_ms.c=131=static DEVICE_ATTR_RO(truinst);\ndrivers/usb/storage/sierra_ms.c-132-\ndrivers/usb/storage/sierra_ms.c:133:int sierra_ms_init(struct us_data us)\ndrivers/usb/storage/sierra_ms.c-134-{\n--\ndrivers/usb/storage/sierra_ms.h-3-#define _SIERRA_MS_H_\ndrivers/usb/storage/sierra_ms.h:4:extern int sierra_ms_init(struct us_data us);\ndrivers/usb/storage/sierra_ms.h-5-#endif\n--\ndrivers/usb/storage/unusual_devs.h=1772=UNUSUAL_DEV( 0x1199, 0x0fff, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1774-\t\t\"USB MMC Storage\",\ndrivers/usb/storage/unusual_devs.h:1775:\t\tUSB_SC_DEVICE, USB_PR_DEVICE, sierra_ms_init,\ndrivers/usb/storage/unusual_devs.h-1776-\t\t0),\n" }
11/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7848 output: 29 thoughts: 28 Thoughts: Okay, let's dive into this. Here's how I'd approach that query, as an expert: Investigating the Sierra Wireless USB Storage Driver Build Configuration Alright, so the user wants to understand how the `sierra_ms` driver in `drivers/usb/storage/` is configured and built within the kernel. My first instinct, and the correct approach, is to go directly to the source. I need to understand the dependencies and build process. I'm going to immediately check the `Makefile` in that directory. I'll be looking for clues – conditional compilation, object file inclusions, any specific flags related to the `sierra_ms` driver. Then, I'll move on to the `Kconfig` file in the same directory. This is where I'll find the configuration options. I'll need to identify the relevant `CONFIG_` options that enable or disable the driver, and understand any dependencies on other kernel features or hardware configurations. I'm hoping to quickly identify which kernel configurations, perhaps `CONFIG_USB_STORAGE` or `CONFIG_SCSI`, are required. I'll also look for any specific `CONFIG_SIERRA_MS` or similar options that directly control this driver's inclusion. By examining these two files in tandem, I should get a complete picture of the build process and the necessary configurations to support Sierra Wireless USB storage devices. This will provide the crucial insights the user is looking for.
12/2	2026/09/16 21:42	tool	grepper	0m Args: { "Expression": "sierra_ms", "PathPrefix": "drivers/usb/storage" } Results: { "Output": "drivers/usb/storage/Makefile=16=usb-storage-y := scsiglue.o protocol.o transport.o usb.o\ndrivers/usb/storage/Makefile:17:usb-storage-y += initializers.o sierra_ms.o option_ms.o\ndrivers/usb/storage/Makefile-18-usb-storage-y += usual-tables.o\n--\ndrivers/usb/storage/option_ms.c-6- \ndrivers/usb/storage/option_ms.c:7: Inspiration taken from sierra_ms.c by Kevin Lloyd \u003cklloyd@sierrawireless.com\u003e\ndrivers/usb/storage/option_ms.c-8- /\n--\ndrivers/usb/storage/sierra_ms.c-13-#include \"scsiglue.h\"\ndrivers/usb/storage/sierra_ms.c:14:#include \"sierra_ms.h\"\ndrivers/usb/storage/sierra_ms.c-15-#include \"debug.h\"\n--\ndrivers/usb/storage/sierra_ms.c=131=static DEVICE_ATTR_RO(truinst);\ndrivers/usb/storage/sierra_ms.c-132-\ndrivers/usb/storage/sierra_ms.c:133:int sierra_ms_init(struct us_data us)\ndrivers/usb/storage/sierra_ms.c-134-{\n--\ndrivers/usb/storage/sierra_ms.h-3-#define _SIERRA_MS_H_\ndrivers/usb/storage/sierra_ms.h:4:extern int sierra_ms_init(struct us_data *us);\ndrivers/usb/storage/sierra_ms.h-5-#endif\n--\ndrivers/usb/storage/unusual_devs.h=1772=UNUSUAL_DEV( 0x1199, 0x0fff, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1774-\t\t\"USB MMC Storage\",\ndrivers/usb/storage/unusual_devs.h:1775:\t\tUSB_SC_DEVICE, USB_PR_DEVICE, sierra_ms_init,\ndrivers/usb/storage/unusual_devs.h-1776-\t\t0),\n--\ndrivers/usb/storage/usb.c-56-\ndrivers/usb/storage/usb.c:57:#include \"sierra_ms.h\"\ndrivers/usb/storage/usb.c-58-#include \"option_ms.h\"\n" }
13/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8844 output: 28 thoughts: 48 Thoughts: USB Storage Module Inclusion Alright, let's break this down. Seeing `usb-storage-y += initializers.o sierra_ms.o option_ms.o` immediately tells me that those object files are being included as part of the `usb-storage` module. That's the obvious conclusion, and it gives us the context we need. Now, to understand the broader implications of this, my next step is clear. I need to dive into the `Kconfig` file associated with `usb-storage`. That configuration file is where the dependencies, build options, and overall structure of the module are defined. By examining it, I can clarify the inclusion of these specific components. This should give me a solid understanding of how those objects are getting linked in.
14/2	2026/09/16 21:42	tool	grepper	0m Args: { "Expression": "usb-storage", "PathPrefix": "drivers/usb/storage" } Results: { "Output": "drivers/usb/storage/Kconfig=8=config USB_STORAGE\n--\ndrivers/usb/storage/Kconfig-23-\t To compile this driver as a module, choose M here: the\ndrivers/usb/storage/Kconfig:24:\t module will be called usb-storage.\ndrivers/usb/storage/Kconfig-25-\n--\ndrivers/usb/storage/Makefile=13=obj-$(CONFIG_USB_UAS)\t\t+= uas.o\ndrivers/usb/storage/Makefile:14:obj-$(CONFIG_USB_STORAGE)\t+= usb-storage.o\ndrivers/usb/storage/Makefile-15-\ndrivers/usb/storage/Makefile:16:usb-storage-y := scsiglue.o protocol.o transport.o usb.o\ndrivers/usb/storage/Makefile:17:usb-storage-y += initializers.o sierra_ms.o option_ms.o\ndrivers/usb/storage/Makefile:18:usb-storage-y += usual-tables.o\ndrivers/usb/storage/Makefile:19:usb-storage-$(CONFIG_USB_STORAGE_DEBUG) += debug.o\ndrivers/usb/storage/Makefile-20-\n--\ndrivers/usb/storage/freecom.c-9- * Current development and maintenance by:\ndrivers/usb/storage/freecom.c:10: * (C) 2000 David Brown \u003cusb-storage@davidb.org\u003e\ndrivers/usb/storage/freecom.c-11- \n--\ndrivers/usb/storage/freecom.c=29=MODULE_DESCRIPTION(\"Driver for Freecom USB/IDE adaptor\");\ndrivers/usb/storage/freecom.c:30:MODULE_AUTHOR(\"David Brown \u003cusb-storage@davidb.org\u003e\");\ndrivers/usb/storage/freecom.c-31-MODULE_LICENSE(\"GPL\");\n--\ndrivers/usb/storage/protocol.c-8- Developed with the assistance of:\ndrivers/usb/storage/protocol.c:9: * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/protocol.c-10- * (c) 2002 Alan Stern (stern@rowland.org)\n--\ndrivers/usb/storage/scsiglue.c-9- * Developed with the assistance of:\ndrivers/usb/storage/scsiglue.c:10: * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/scsiglue.c-11- * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)\n--\ndrivers/usb/storage/scsiglue.c=527=static int show_info (struct seq_file m, struct Scsi_Host host)\n--\ndrivers/usb/storage/scsiglue.c-532-\t/* print the controller name /\ndrivers/usb/storage/scsiglue.c:533:\tseq_printf(m, \" Host scsi%d: usb-storage\\n\", host-\u003ehost_no);\ndrivers/usb/storage/scsiglue.c-534-\n--\ndrivers/usb/storage/scsiglue.c=615=static const struct scsi_host_template usb_stor_host_template = {\ndrivers/usb/storage/scsiglue.c-616-\t/ basic userland interface stuff /\ndrivers/usb/storage/scsiglue.c:617:\t.name =\t\t\t\t\"usb-storage\",\ndrivers/usb/storage/scsiglue.c:618:\t.proc_name =\t\t\t\"usb-storage\",\ndrivers/usb/storage/scsiglue.c-619-\t.show_info =\t\t\tshow_info,\n--\ndrivers/usb/storage/transport.c-8- Developed with the assistance of:\ndrivers/usb/storage/transport.c:9: * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/transport.c-10- * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)\n--\ndrivers/usb/storage/transport.c=101=static void usb_stor_blocking_completion(struct urb urb)\n--\ndrivers/usb/storage/transport.c-110- \ndrivers/usb/storage/transport.c:111: * All URBs from the usb-storage driver involved in handling a queued scsi\ndrivers/usb/storage/transport.c-112- * command _must_ pass through this function (or something like it) for the\n--\ndrivers/usb/storage/uas-detect.h=55=static int uas_use_uas_driver(struct usb_interface intf,\n--\ndrivers/usb/storage/uas-detect.h-135-\t\tdev_warn(\u0026udev-\u003edev,\ndrivers/usb/storage/uas-detect.h:136:\t\t\t\"UAS is ignored for this device, using usb-storage instead\\n\");\ndrivers/usb/storage/uas-detect.h-137-\t\treturn 0;\n--\ndrivers/usb/storage/uas.c=1214=static void uas_disconnect(struct usb_interface intf)\n--\ndrivers/usb/storage/uas.c-1241-/\ndrivers/usb/storage/uas.c:1242: Put the device back in usb-storage mode on shutdown, as some BIOS-es\ndrivers/usb/storage/uas.c-1243- * hang on reboot when the device is still in uas mode. Note the reset is\ndrivers/usb/storage/uas.c:1244: * necessary as some devices won't revert to usb-storage mode without it.\ndrivers/usb/storage/uas.c-1245- /\n--\ndrivers/usb/storage/unusual_devs.h=1370=UNUSUAL_DEV( 0x0af0, 0x6971, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1378- This device (wrongly) has a vendor-specific device descriptor.\ndrivers/usb/storage/unusual_devs.h:1379: * The entry is needed so usb-storage can bind to it's mass-storage\ndrivers/usb/storage/unusual_devs.h-1380- * interface as an interface driver\n--\ndrivers/usb/storage/unusual_devs.h=1382=UNUSUAL_DEV( 0x0af0, 0x7401, 0x0000, 0x0000,\n--\ndrivers/usb/storage/unusual_devs.h-1390- * These devices (wrongly) have a vendor-specific device descriptor.\ndrivers/usb/storage/unusual_devs.h:1391: * These entries are needed so usb-storage can bind to their mass-storage\ndrivers/usb/storage/unusual_devs.h-1392- * interface as an interface driver\n--\ndrivers/usb/storage/unusual_devs.h=1772=UNUSUAL_DEV( 0x1199, 0x0fff, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1779- * Reported by Jaco Kroon \u003cjaco@kroon.co.za\u003e\ndrivers/usb/storage/unusual_devs.h:1780: * The usb-storage module found on the Digitech GNX4 (and supposedly other\ndrivers/usb/storage/unusual_devs.h-1781- * devices) misbehaves and causes a bunch of invalid I/O errors.\n--\ndrivers/usb/storage/unusual_devs.h=2302=UNUSUAL_DEV( 0x1b1c, 0x1ab5, 0x0200, 0x0200,\n--\ndrivers/usb/storage/unusual_devs.h-2310- * These are mini projectors using USB for both power and video data transport\ndrivers/usb/storage/unusual_devs.h:2311: * The usb-storage interface is a virtual windows driver CD, which the gm12u320\ndrivers/usb/storage/unusual_devs.h-2312- * driver automatically converts into framebuffer \u0026 kms dri device nodes.\n--\ndrivers/usb/storage/unusual_onetouch.h-10- * Submitted by: Nick Sillik \u003cn.sillik@temple.edu\u003e\ndrivers/usb/storage/unusual_onetouch.h:11: * Needed for OneTouch extension to usb-storage\ndrivers/usb/storage/unusual_onetouch.h-12- /\n--\ndrivers/usb/storage/unusual_uas.h-6- \ndrivers/usb/storage/unusual_uas.h:7: * Based on the same file for the usb-storage driver, which is:\ndrivers/usb/storage/unusual_uas.h-8- * (c) 2000-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)\n--\ndrivers/usb/storage/usb.c-8- * Developed with the assistance of:\ndrivers/usb/storage/usb.c:9: * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/usb.c-10- * (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu)\n--\ndrivers/usb/storage/usb.c-63-\ndrivers/usb/storage/usb.c:64:#define DRV_NAME \"usb-storage\"\ndrivers/usb/storage/usb.c-65-\n--\ndrivers/usb/storage/usb.c=670=static int get_device_info(struct us_data us, const struct usb_device_id id,\n--\ndrivers/usb/storage/usb.c-733-\t\t\t\t\t\"\u003clinux-usb@vger.kernel.org\u003e and \"\ndrivers/usb/storage/usb.c:734:\t\t\t\t\t\"\u003cusb-storage@lists.one-eyed-alien.net\u003e\\n\",\ndrivers/usb/storage/usb.c-735-\t\t\t\t\tle16_to_cpu(ddesc-\u003eidVendor),\n--\ndrivers/usb/storage/usb.c=855=static int usb_stor_acquire_resources(struct us_data us)\n--\ndrivers/usb/storage/usb.c-874-\t/ Start up our control thread /\ndrivers/usb/storage/usb.c:875:\tth = kthread_run(usb_stor_control_thread, us, \"usb-storage\");\ndrivers/usb/storage/usb.c-876-\tif (IS_ERR(th)) {\n--\ndrivers/usb/storage/usb.c=1098=int usb_stor_probe2(struct us_data us)\n--\ndrivers/usb/storage/usb.c-1152-\tusb_autopm_get_interface_no_resume(us-\u003epusb_intf);\ndrivers/usb/storage/usb.c:1153:\tsnprintf(us-\u003escsi_name, sizeof(us-\u003escsi_name), \"usb-storage %s\",\ndrivers/usb/storage/usb.c-1154-\t\t\t\t\tdev_name(\u0026us-\u003epusb_intf-\u003edev));\n--\ndrivers/usb/storage/usb.h=162=extern void fill_inquiry_response(struct us_data us,\n--\ndrivers/usb/storage/usb.h-171-\ndrivers/usb/storage/usb.h:172:/ General routines provided by the usb-storage standard core /\ndrivers/usb/storage/usb.h-173-#ifdef CONFIG_PM\n--\ndrivers/usb/storage/usual-tables.c-3- Driver for USB Mass Storage devices\ndrivers/usb/storage/usual-tables.c:4: * Usual Tables File for usb-storage and libusual\ndrivers/usb/storage/usual-tables.c-5- *\n" }
15/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 12096 output: 42 thoughts: 159 Thoughts: Syzkaller's USB Fuzzing Approach Okay, let's dive into how syzkaller handles testing USB devices. My immediate thought is, "Ah, right, it leverages the USB raw gadget and `syz_usb_connect` system call for emulation. Clever." Now, I'm curious if it's capable of fuzzing something specific, like usb-storage devices. I seem to recall it does, and yep, syzkaller does a pretty thorough job by regularly spinning up emulated USB devices with all sorts of vendor and product ID combinations, like the ubiquitous 0x1199 and 0x0fff, to target `usb-storage` and also those `unusual_devs`. Thinking further, I should verify that syzkaller also can read some sysfs attributes of these devices, like `truinst` (it probably does, but let's confirm). Hold on a second, what's this `unusual_devs.h` file and why is it popping into my head? Line 1772 in particular... I'm going to have to go and check out lines 1765 through 1785 of that file, `drivers/usb/storage/unusual_devs.h`, to refresh my memory and understand the context.
16/2	2026/09/16 21:42	tool	read-file	0m Args: { "File": "drivers/usb/storage/unusual_devs.h", "FirstLine": 1765, "LineCount": 25 } Results: { "Contents": "1765:\t\n1766:\t/\n1767:\t Reported by Kevin Lloyd \u003clinux@sierrawireless.com\u003e\n1768:\t * Entry is needed for the initializer function override,\n1769:\t * which instructs the device to load as a modem\n1770:\t * device.\n1771:\t /\n1772:\tUNUSUAL_DEV( 0x1199, 0x0fff, 0x0000, 0x9999,\n1773:\t\t\t\"Sierra Wireless\",\n1774:\t\t\t\"USB MMC Storage\",\n1775:\t\t\tUSB_SC_DEVICE, USB_PR_DEVICE, sierra_ms_init,\n1776:\t\t\t0),\n1777:\t\n1778:\t/\n1779:\t * Reported by Jaco Kroon \u003cjaco@kroon.co.za\u003e\n1780:\t * The usb-storage module found on the Digitech GNX4 (and supposedly other\n1781:\t * devices) misbehaves and causes a bunch of invalid I/O errors.\n1782:\t /\n1783:\tUNUSUAL_DEV( 0x1210, 0x0003, 0x0100, 0x0100,\n1784:\t\t\t\"Digitech HMG\",\n1785:\t\t\t\"DigiTech Mass Storage\",\n1786:\t\t\tUSB_SC_DEVICE, USB_PR_DEVICE, NULL,\n1787:\t\t\tUS_FL_IGNORE_RESIDUE ),\n1788:\t\n1789:\t/\n" }
17/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 13003 output: 27 thoughts: 75 Thoughts: Analyzing USB Device Initialization Okay, so a USB device with the specific vendor and product IDs, `0x1199` and `0x0fff` respectively, has been plugged in. This happened through syzkaller's USB raw gadget emulation, which is interesting in itself. The important thing now is that the `usb-storage` driver has correctly matched this device. My first instinct is to immediately jump to the `usb-storage` probe function and trace the initialization process. Let's see what happens from the call to `sierra_ms_init`. I need to understand this whole chain of events, from device detection all the way through to actual operation, so I'll check `usb.c` to understand the bigger picture. Time to dive into the code.
18/2	2026/09/16 21:42	tool	grepper	0m Args: { "Expression": "initFunction", "PathPrefix": "drivers/usb/storage" } Results: { "Output": "drivers/usb/storage/alauda.c=123=static int init_alauda(struct us_data us);\n--\ndrivers/usb/storage/alauda.c-130-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/alauda.c:131:\t\t initFunction, flags) \\\ndrivers/usb/storage/alauda.c-132-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/alauda.c=139=MODULE_DEVICE_TABLE(usb, alauda_usb_ids);\n--\ndrivers/usb/storage/alauda.c-153-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/alauda.c:154:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/alauda.c-155-}\n--\ndrivers/usb/storage/cypress_atacb.c=25=MODULE_IMPORT_NS(\"USB_STORAGE\");\n--\ndrivers/usb/storage/cypress_atacb.c-31-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/cypress_atacb.c:32:\t\t initFunction, flags) \\\ndrivers/usb/storage/cypress_atacb.c-33-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/cypress_atacb.c=40=MODULE_DEVICE_TABLE(usb, cypress_usb_ids);\n--\ndrivers/usb/storage/cypress_atacb.c-54-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/cypress_atacb.c:55:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/cypress_atacb.c-56-}\n--\ndrivers/usb/storage/datafab.c=70=static int datafab_determine_lun(struct us_data us,\n--\ndrivers/usb/storage/datafab.c-78-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/datafab.c:79:\t\t initFunction, flags) \\\ndrivers/usb/storage/datafab.c-80-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/datafab.c=87=MODULE_DEVICE_TABLE(usb, datafab_usb_ids);\n--\ndrivers/usb/storage/datafab.c-101-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/datafab.c:102:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/datafab.c-103-}\n--\ndrivers/usb/storage/ene_ub6250.c=35=MODULE_FIRMWARE(MS_RW_FIRMWARE);\n--\ndrivers/usb/storage/ene_ub6250.c-41-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/ene_ub6250.c:42:\t\t initFunction, flags) \\\ndrivers/usb/storage/ene_ub6250.c-43-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/ene_ub6250.c=50=MODULE_DEVICE_TABLE(usb, ene_ub6250_usb_ids);\n--\ndrivers/usb/storage/ene_ub6250.c-64-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/ene_ub6250.c:65:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/ene_ub6250.c-66-}\n--\ndrivers/usb/storage/freecom.c=110=static int init_freecom(struct us_data us);\n--\ndrivers/usb/storage/freecom.c-117-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/freecom.c:118:\t\t initFunction, flags) \\\ndrivers/usb/storage/freecom.c-119-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/freecom.c=126=MODULE_DEVICE_TABLE(usb, freecom_usb_ids);\n--\ndrivers/usb/storage/freecom.c-140-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/freecom.c:141:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/freecom.c-142-}\n--\ndrivers/usb/storage/isd200.c=58=static int isd200_Initialization(struct us_data us);\n--\ndrivers/usb/storage/isd200.c-65-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/isd200.c:66:\t\t initFunction, flags) \\\ndrivers/usb/storage/isd200.c-67-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/isd200.c=74=MODULE_DEVICE_TABLE(usb, isd200_usb_ids);\n--\ndrivers/usb/storage/isd200.c-88-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/isd200.c:89:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/isd200.c-90-}\n--\ndrivers/usb/storage/jumpshot.c=54=MODULE_IMPORT_NS(\"USB_STORAGE\");\n--\ndrivers/usb/storage/jumpshot.c-60-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/jumpshot.c:61:\t\t initFunction, flags) \\\ndrivers/usb/storage/jumpshot.c-62-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/jumpshot.c=69=MODULE_DEVICE_TABLE(usb, jumpshot_usb_ids);\n--\ndrivers/usb/storage/jumpshot.c-83-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/jumpshot.c:84:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/jumpshot.c-85-}\n--\ndrivers/usb/storage/karma.c=42=static int rio_karma_init(struct us_data us);\n--\ndrivers/usb/storage/karma.c-49-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/karma.c:50:\t\t initFunction, flags) \\\ndrivers/usb/storage/karma.c-51-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/karma.c=58=MODULE_DEVICE_TABLE(usb, karma_usb_ids);\n--\ndrivers/usb/storage/karma.c-72-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/karma.c:73:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/karma.c-74-}\n--\ndrivers/usb/storage/onetouch.c=36=struct usb_onetouch {\n--\ndrivers/usb/storage/onetouch.c-53-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/onetouch.c:54:\t\t initFunction, flags) \\\ndrivers/usb/storage/onetouch.c-55-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/onetouch.c=62=MODULE_DEVICE_TABLE(usb, onetouch_usb_ids);\n--\ndrivers/usb/storage/onetouch.c-76-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/onetouch.c:77:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/onetouch.c-78-}\n--\ndrivers/usb/storage/realtek_cr.c=158=static int init_realtek_cr(struct us_data us);\n--\ndrivers/usb/storage/realtek_cr.c-164-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/realtek_cr.c:165:\t\t initFunction, flags) \\\ndrivers/usb/storage/realtek_cr.c-166-{\\\n--\ndrivers/usb/storage/realtek_cr.c=176=MODULE_DEVICE_TABLE(usb, realtek_cr_ids);\n--\ndrivers/usb/storage/realtek_cr.c-190-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/realtek_cr.c:191:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/realtek_cr.c-192-}\n--\ndrivers/usb/storage/sddr09.c=54=static int usb_stor_sddr09_init(struct us_data us);\n--\ndrivers/usb/storage/sddr09.c-61-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/sddr09.c:62:\t\t initFunction, flags) \\\ndrivers/usb/storage/sddr09.c-63-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/sddr09.c=70=MODULE_DEVICE_TABLE(usb, sddr09_usb_ids);\n--\ndrivers/usb/storage/sddr09.c-84-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/sddr09.c:85:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/sddr09.c-86-}\n--\ndrivers/usb/storage/sddr55.c=32=MODULE_IMPORT_NS(\"USB_STORAGE\");\n--\ndrivers/usb/storage/sddr55.c-38-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/sddr55.c:39:\t\t initFunction, flags) \\\ndrivers/usb/storage/sddr55.c-40-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/sddr55.c=47=MODULE_DEVICE_TABLE(usb, sddr55_usb_ids);\n--\ndrivers/usb/storage/sddr55.c-61-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/sddr55.c:62:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/sddr55.c-63-}\n--\ndrivers/usb/storage/shuttle_usbat.c=154=static int init_usbat_flash(struct us_data us);\n--\ndrivers/usb/storage/shuttle_usbat.c-161-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/shuttle_usbat.c:162:\t\t initFunction, flags) \\\ndrivers/usb/storage/shuttle_usbat.c-163-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/shuttle_usbat.c=170=MODULE_DEVICE_TABLE(usb, usbat_usb_ids);\n--\ndrivers/usb/storage/shuttle_usbat.c-184-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/shuttle_usbat.c:185:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/shuttle_usbat.c-186-}\n--\ndrivers/usb/storage/uas.c=913=static const struct scsi_host_template uas_host_template = {\n--\ndrivers/usb/storage/uas.c-935-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/uas.c:936:\t\t initFunction, flags) \\\ndrivers/usb/storage/uas.c-937-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/usb.c=170=MODULE_PARM_DESC(quirks, \"supplemental list of device IDs and their quirks\");\n--\ndrivers/usb/storage/usb.c-195-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/usb.c:196:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/usb.c-197-}\n--\ndrivers/usb/storage/usb.c=855=static int usb_stor_acquire_resources(struct us_data us)\n--\ndrivers/usb/storage/usb.c-867-\t /\ndrivers/usb/storage/usb.c:868:\tif (us-\u003eunusual_dev-\u003einitFunction) {\ndrivers/usb/storage/usb.c:869:\t\tp = us-\u003eunusual_dev-\u003einitFunction(us);\ndrivers/usb/storage/usb.c-870-\t\tif (p)\n--\ndrivers/usb/storage/usb.h=45=struct us_unusual_dev {\n--\ndrivers/usb/storage/usb.h-49-\t__u8 useTransport;\ndrivers/usb/storage/usb.h:50:\tint (initFunction)(struct us_data );\ndrivers/usb/storage/usb.h-51-};\n--\ndrivers/usb/storage/usual-tables.c-19-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/usual-tables.c:20:\t\t initFunction, flags) \\\ndrivers/usb/storage/usual-tables.c-21-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/usual-tables.c=42=struct ignore_entry {\n--\ndrivers/usb/storage/usual-tables.c-47-\t\t vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/usual-tables.c:48:\t\t initFunction, flags) \\\ndrivers/usb/storage/usual-tables.c-49-{\t\t\t\t\t\\\n" }
19/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 17058 output: 34 thoughts: 1259 Thoughts: Analysis of USB Control Message Handling in sierra_ms Driver Okay, let's break this down. I'm looking at `usb.c:869` and see that `sierra_ms_init` is called as the initialization function for the Sierra Wireless device with vendor ID 0x1199 and product ID 0x0fff. This function calls `sierra_get_swoc_info`. Inside `sierra_get_swoc_info`, we have a `usb_control_msg` call using `SWIMS_USB_REQUEST_GetSwocInfo` to retrieve some information, `swocInfo`. Previously, there was no check on the result of this control message! The current patch now checks the size of the returned data. Specifically, `if (result != sizeof(struct swoc_info))` returns `-EIO`. Before this, a short transfer or an error wouldn't necessarily be handled correctly, and `swocInfo->LinuxSKU` and `swocInfo->LinuxVer` might have been read from uninitialized memory if `usb_control_msg` returned a value less than the expected size but greater than zero. This is a critical vulnerability. KMSAN would likely detect the use of uninitialized values. The new check ensures that only a full, valid transfer is accepted, essentially treating any short read as an error. The important point here is that previously if `result` was negative, the function returned `result`, which was negative, and `sierra_ms_init` correctly checked for this case. However, the use of `result != sizeof(struct swoc_info)` now also correctly handles the scenario when `result` is negative, because in C, the negative `int` `result` is promoted to `unsigned long` (or `size_t`) and therefore returns `-EIO` because it's not equal to `sizeof(struct swoc_info)`. So, the new code is much better. Next, I need to consider the exploitability of this. Can we trigger this condition easily? Definitely! Syzkaller can fuzz USB devices via emulation. It explicitly targets drivers accessible through virtual buses, including USB gadgets. It should be easy to create test cases. The mention of "syz_usb_connect," USB Raw Gadget, and dummy_hcd confirms that `usb-storage` and `sierra_ms` are reachable via USB emulation in syzkaller. Now, let's verify which configs are needed for `sierra_ms.c` and figure out how to best trigger this. I'll need to check `drivers/usb/storage/Makefile` and `drivers/usb/storage/Kconfig`.
20/2	2026/09/16 21:42	tool	read-file	0m Args: { "File": "drivers/usb/storage/Kconfig", "FirstLine": 1, "LineCount": 40 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0\n 2:\t#\n 3:\t# USB Storage driver configuration\n 4:\t#\n 5:\t\n 6:\tcomment \"NOTE: USB_STORAGE depends on SCSI but BLK_DEV_SD may also be needed; see USB_STORAGE Help for more info\"\n 7:\t\n 8:\tconfig USB_STORAGE\n 9:\t\ttristate \"USB Mass Storage support\"\n 10:\t\tdepends on SCSI\n 11:\t\thelp\n 12:\t\t Say Y here if you want to connect USB mass storage devices to your\n 13:\t\t computer's USB port. This is the driver you need for USB\n 14:\t\t floppy drives, USB hard disks, USB tape drives, USB CD-ROMs,\n 15:\t\t USB flash devices, and memory sticks, along with\n 16:\t\t similar devices. This driver may also be used for some cameras\n 17:\t\t and card readers.\n 18:\t\n 19:\t\t This option depends on 'SCSI' support being enabled, but you\n 20:\t\t probably also need 'SCSI device support: SCSI disk support'\n 21:\t\t (BLK_DEV_SD) for most USB storage devices.\n 22:\t\n 23:\t\t To compile this driver as a module, choose M here: the\n 24:\t\t module will be called usb-storage.\n 25:\t\n 26:\tif USB_STORAGE\n 27:\t\n 28:\tconfig USB_STORAGE_DEBUG\n 29:\t\tbool \"USB Mass Storage verbose debug\"\n 30:\t\thelp\n 31:\t\t Say Y here in order to have the USB Mass Storage code generate\n 32:\t\t verbose debugging messages.\n 33:\t\n 34:\tconfig USB_STORAGE_REALTEK\n 35:\t\ttristate \"Realtek Card Reader support\"\n 36:\t\thelp\n 37:\t\t Say Y here to include additional code to support the power-saving function\n 38:\t\t for Realtek RTS51xx USB card readers.\n 39:\t\n 40:\t\t If this driver is compiled as a module, it will be named ums-realtek.\n" }
21/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 19499 output: 24 thoughts: 27 Thoughts: Here's my thinking process: Investigating USB Storage Driver Enablement Okay, so I need to figure out what's enabling the USB storage driver, specifically `drivers/usb/storage/`. My initial thought is to trace the configuration options. A good starting point is always the `Makefile` in the directory I'm interested in (`drivers/usb/`). This `Makefile` should reveal which Kconfig options, if any, control the compilation of the USB storage module. If it doesn't give me the full picture, I'll need to look at parent directories' `Kconfig` files and work my way up the kernel's source tree. I'm expecting this is a fairly standard configuration dependency, but I need to confirm and identify the specific option(s) responsible for enabling this particular module.
22/2	2026/09/16 21:42	tool	grepper	0m Args: { "Expression": "storage", "PathPrefix": "drivers/usb" } Results: { "Output": "\nFull output is too long, showing 500 out of 816 lines.\nUse more precise expression if possible.\n\ndrivers/usb/Kconfig=114=source \"drivers/usb/class/Kconfig\"\ndrivers/usb/Kconfig-115-\ndrivers/usb/Kconfig:116:source \"drivers/usb/storage/Kconfig\"\ndrivers/usb/Kconfig-117-\n--\ndrivers/usb/Makefile=45=obj-$(CONFIG_USB_TMC)\t\t+= class/\ndrivers/usb/Makefile-46-\ndrivers/usb/Makefile:47:obj-$(CONFIG_USB_STORAGE)\t+= storage/\ndrivers/usb/Makefile:48:obj-$(CONFIG_USB)\t\t+= storage/\ndrivers/usb/Makefile-49-\n--\ndrivers/usb/core/hub.c=3738=static int wait_for_connected(struct usb_device udev,\n--\ndrivers/usb/core/hub.c-3777- power sessions below it will be broken. This is especially troublesome\ndrivers/usb/core/hub.c:3778: * for mass-storage devices containing mounted filesystems, since the\ndrivers/usb/core/hub.c-3779- * device will appear to have disconnected and all the memory mappings\n--\ndrivers/usb/core/hub.c=4106=static int usb_req_set_sel(struct usb_device udev)\n--\ndrivers/usb/core/hub.c-4141-\t usb_enable_lpm() can be called as part of a failed device reset,\ndrivers/usb/core/hub.c:4142:\t * which may be initiated by an error path of a mass storage driver.\ndrivers/usb/core/hub.c-4143-\t * Therefore, use GFP_NOIO.\n--\ndrivers/usb/core/hub.c=6349=int usb_reset_device(struct usb_device udev)\n--\ndrivers/usb/core/hub.c-6378-\t context to avoid possible deadlock if usb mass\ndrivers/usb/core/hub.c:6379:\t * storage interface or usbnet interface(iSCSI case)\ndrivers/usb/core/hub.c-6380-\t * is included in current configuration. The easist\n--\ndrivers/usb/core/message.c=1207=int usb_clear_halt(struct usb_device dev, int pipe)\n--\ndrivers/usb/core/message.c-1232-\t NOTE: make sure the logic here doesn't diverge much from\ndrivers/usb/core/message.c:1233:\t * the copy in usb-storage, for as long as we need two copies.\ndrivers/usb/core/message.c-1234-\t /\n--\ndrivers/usb/core/urb.c=229=EXPORT_SYMBOL_GPL(usb_urb_ep_type_check);\n--\ndrivers/usb/core/urb.c-348- \ndrivers/usb/core/urb.c:349: * GFP_NOIO is used in the block io path and error handling of storage\ndrivers/usb/core/urb.c-350- * devices.\n--\ndrivers/usb/core/urb.c-361- * (4) after you have done a down() you can use GFP_KERNEL, unless (b) or (c)\ndrivers/usb/core/urb.c:362: * apply or your are in a storage driver's block io path;\ndrivers/usb/core/urb.c-363- * (5) USB probe and disconnect can use GFP_KERNEL unless (b) or (c) apply; and\ndrivers/usb/core/urb.c:364: * (6) changing firmware on a running storage or net device uses\ndrivers/usb/core/urb.c-365- * GFP_NOIO, unless b) or c) apply\n--\ndrivers/usb/core/usb.c=862=EXPORT_SYMBOL_GPL(usb_intf_get_dma_device);\n--\ndrivers/usb/core/usb.c-888- * lock, the routine polls repeatedly. This is to prevent deadlock with\ndrivers/usb/core/usb.c:889: * disconnect; in some drivers (such as usb-storage) the disconnect()\ndrivers/usb/core/usb.c-890- * or suspend() method will block waiting for a device reset to complete.\n--\ndrivers/usb/dwc2/hcd.c=4991=static struct hc_driver dwc2_hc_driver = {\n--\ndrivers/usb/dwc2/hcd.c-5018-/\ndrivers/usb/dwc2/hcd.c:5019: Frees secondary storage associated with the dwc2_hsotg structure contained\ndrivers/usb/dwc2/hcd.c-5020- * in the struct usb_hcd field\n--\ndrivers/usb/dwc3/gadget.c=4102=static void dwc3_gadget_reset_interrupt(struct dwc3 dwc)\n--\ndrivers/usb/dwc3/gadget.c-4111-\t However, for functions which defer ep disable, such as mass\ndrivers/usb/dwc3/gadget.c:4112:\t * storage, we will need to rely on the call to stop active\ndrivers/usb/dwc3/gadget.c-4113-\t * transfers here, and avoid allowing of request queuing.\n--\ndrivers/usb/fotg210/fotg210-hcd.c=4889=static int hcd_fotg210_init(struct usb_hcd hcd)\n--\ndrivers/usb/fotg210/fotg210-hcd.c-4970-\t\t \ndrivers/usb/fotg210/fotg210-hcd.c:4971:\t\t * With fast usb storage devices and NForce2, \"park\" seems to\ndrivers/usb/fotg210/fotg210-hcd.c-4972-\t\t * make problems: throughput reduction (!), data errors...\n--\ndrivers/usb/gadget/Kconfig=116=config USB_GADGET_STORAGE_NUM_BUFFERS\ndrivers/usb/gadget/Kconfig:117:\tint \"Number of storage pipeline buffers\"\ndrivers/usb/gadget/Kconfig-118-\trange 2 256\n--\ndrivers/usb/gadget/Kconfig=345=config USB_CONFIGFS_MASS_STORAGE\ndrivers/usb/gadget/Kconfig:346:\tbool \"Mass storage\"\ndrivers/usb/gadget/Kconfig-347-\tdepends on USB_CONFIGFS\n--\ndrivers/usb/gadget/Kconfig-351-\t The Mass Storage Gadget acts as a USB Mass Storage disk drive.\ndrivers/usb/gadget/Kconfig:352:\t As its storage repository it can use a regular file or a block\ndrivers/usb/gadget/Kconfig-353-\t device (in much the same way as the \"loop\" device driver),\n--\ndrivers/usb/gadget/Kconfig=369=config USB_CONFIGFS_F_FS\n--\ndrivers/usb/gadget/Kconfig-378-\t implemented in kernel space (for instance Ethernet, serial or\ndrivers/usb/gadget/Kconfig:379:\t mass storage) and other are implemented in user space.\ndrivers/usb/gadget/Kconfig-380-\n--\ndrivers/usb/gadget/function/Makefile=31=obj-$(CONFIG_USB_F_RNDIS)\t+= usb_f_rndis.o\ndrivers/usb/gadget/function/Makefile:32:usb_f_mass_storage-y\t\t:= f_mass_storage.o storage_common.o\ndrivers/usb/gadget/function/Makefile:33:obj-$(CONFIG_USB_F_MASS_STORAGE)+= usb_f_mass_storage.o\ndrivers/usb/gadget/function/Makefile-34-usb_f_fs-y\t\t\t:= f_fs.o\n--\ndrivers/usb/gadget/function/f_fs.c=234=struct ffs_buffer {\n--\ndrivers/usb/gadget/function/f_fs.c-236-\tchar data;\ndrivers/usb/gadget/function/f_fs.c:237:\tchar storage[] __counted_by(length);\ndrivers/usb/gadget/function/f_fs.c-238-};\n--\ndrivers/usb/gadget/function/f_fs.c=941=static ssize_t __ffs_epfile_read_data(struct ffs_epfile epfile,\n--\ndrivers/usb/gadget/function/f_fs.c-958-\tdata_len -= ret;\ndrivers/usb/gadget/function/f_fs.c:959:\tbuf = kmalloc(struct_size(buf, storage, data_len), GFP_KERNEL);\ndrivers/usb/gadget/function/f_fs.c-960-\tif (!buf)\n--\ndrivers/usb/gadget/function/f_fs.c-962-\tbuf-\u003elength = data_len;\ndrivers/usb/gadget/function/f_fs.c:963:\tbuf-\u003edata = buf-\u003estorage;\ndrivers/usb/gadget/function/f_fs.c:964:\tmemcpy(buf-\u003estorage, data + ret, flex_array_size(buf, storage, data_len));\ndrivers/usb/gadget/function/f_fs.c-965-\n--\ndrivers/usb/gadget/function/f_mass_storage.c-2-/\ndrivers/usb/gadget/function/f_mass_storage.c:3: f_mass_storage.c -- Mass Storage USB Composite Function\ndrivers/usb/gadget/function/f_mass_storage.c-4- \n--\ndrivers/usb/gadget/function/f_mass_storage.c-19- parameters and sysfs interface read the\ndrivers/usb/gadget/function/f_mass_storage.c:20: * \u003cDocumentation/usb/mass-storage.rst\u003e file.\ndrivers/usb/gadget/function/f_mass_storage.c-21- /\n--\ndrivers/usb/gadget/function/f_mass_storage.c=207=static const char fsg_string_interface[] = \"Mass Storage\";\ndrivers/usb/gadget/function/f_mass_storage.c-208-\ndrivers/usb/gadget/function/f_mass_storage.c:209:#include \"storage_common.h\"\ndrivers/usb/gadget/function/f_mass_storage.c:210:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/function/f_mass_storage.c-211-\n--\ndrivers/usb/gadget/function/f_mass_storage.c=234=struct fsg_common {\n--\ndrivers/usb/gadget/function/f_mass_storage.c-275-\tunsigned int\t\tcan_stall:1;\ndrivers/usb/gadget/function/f_mass_storage.c:276:\tunsigned int\t\tfree_storage_on_release:1;\ndrivers/usb/gadget/function/f_mass_storage.c-277-\tunsigned int\t\tphase_error:1;\n--\ndrivers/usb/gadget/function/f_mass_storage.c=2699=static struct fsg_common fsg_common_setup(struct fsg_common common)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-2704-\t\t\treturn ERR_PTR(-ENOMEM);\ndrivers/usb/gadget/function/f_mass_storage.c:2705:\t\tcommon-\u003efree_storage_on_release = 1;\ndrivers/usb/gadget/function/f_mass_storage.c-2706-\t} else {\ndrivers/usb/gadget/function/f_mass_storage.c:2707:\t\tcommon-\u003efree_storage_on_release = 0;\ndrivers/usb/gadget/function/f_mass_storage.c-2708-\t}\n--\ndrivers/usb/gadget/function/f_mass_storage.c=2995=static void fsg_common_release(struct fsg_common common)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-3015-\t_fsg_common_free_buffers(common-\u003ebuffhds, common-\u003efsg_num_buffers);\ndrivers/usb/gadget/function/f_mass_storage.c:3016:\tif (common-\u003efree_storage_on_release)\ndrivers/usb/gadget/function/f_mass_storage.c-3017-\t\tkfree(common);\n--\ndrivers/usb/gadget/function/f_mass_storage.c=3023=static int fsg_bind(struct usb_configuration c, struct usb_function f)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-3052-\t\tcommon-\u003ethread_task =\ndrivers/usb/gadget/function/f_mass_storage.c:3053:\t\t\tkthread_run(fsg_main_thread, common, \"file-storage\");\ndrivers/usb/gadget/function/f_mass_storage.c-3054-\t\tif (IS_ERR(common-\u003ethread_task)) {\n--\ndrivers/usb/gadget/function/f_mass_storage.c=3551=static struct usb_function fsg_alloc(struct usb_function_instance fi)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-3577-\ndrivers/usb/gadget/function/f_mass_storage.c:3578:DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc);\ndrivers/usb/gadget/function/f_mass_storage.c-3579-MODULE_DESCRIPTION(\"Mass Storage USB Composite Function\");\n--\ndrivers/usb/gadget/function/f_mass_storage.h-5-#include \u003clinux/usb/composite.h\u003e\ndrivers/usb/gadget/function/f_mass_storage.h:6:#include \"storage_common.h\"\ndrivers/usb/gadget/function/f_mass_storage.h-7-\n--\ndrivers/usb/gadget/function/f_tcm.c-18-#include \u003clinux/usb/gadget.h\u003e\ndrivers/usb/gadget/function/f_tcm.c:19:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/function/f_tcm.c-20-#include \u003cscsi/scsi_tcq.h\u003e\n--\ndrivers/usb/gadget/function/storage_common.c-2-/\ndrivers/usb/gadget/function/storage_common.c:3: storage_common.c -- Common definitions for mass storage functionality\ndrivers/usb/gadget/function/storage_common.c-4- \n--\ndrivers/usb/gadget/function/storage_common.c-28-\ndrivers/usb/gadget/function/storage_common.c:29:#include \"storage_common.h\"\ndrivers/usb/gadget/function/storage_common.c-30-\n--\ndrivers/usb/gadget/function/storage_common.c=538=EXPORT_SYMBOL_GPL(fsg_store_forced_eject);\ndrivers/usb/gadget/function/storage_common.c-539-\ndrivers/usb/gadget/function/storage_common.c:540:MODULE_DESCRIPTION(\"Common definitions for mass storage functionality\");\ndrivers/usb/gadget/function/storage_common.c-541-MODULE_LICENSE(\"GPL\");\n--\ndrivers/usb/gadget/function/storage_common.h-5-#include \u003clinux/device.h\u003e\ndrivers/usb/gadget/function/storage_common.h:6:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/function/storage_common.h-7-#include \u003cscsi/scsi.h\u003e\n--\ndrivers/usb/gadget/function/storage_common.h=125=static inline bool fsg_lun_is_open(struct fsg_lun curlun)\n--\ndrivers/usb/gadget/function/storage_common.h-132-\ndrivers/usb/gadget/function/storage_common.h:133:/* Maximal number of LUNs supported in mass storage function /\ndrivers/usb/gadget/function/storage_common.h-134-#define FSG_MAX_LUNS\t(US_BULK_MAX_LUN_LIMIT + 1)\n--\ndrivers/usb/gadget/function/tcm.h-9-#include \u003clinux/usb/uas.h\u003e\ndrivers/usb/gadget/function/tcm.h:10:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/function/tcm.h-11-#include \u003ctarget/target_core_base.h\u003e\n--\ndrivers/usb/gadget/legacy/Kconfig=218=config USB_FUNCTIONFS\n--\ndrivers/usb/gadget/legacy/Kconfig-228-\t implemented in kernel space (for instance Ethernet, serial or\ndrivers/usb/gadget/legacy/Kconfig:229:\t mass storage) and other are implemented in user space.\ndrivers/usb/gadget/legacy/Kconfig-230-\n--\ndrivers/usb/gadget/legacy/Kconfig=262=config USB_MASS_STORAGE\n--\ndrivers/usb/gadget/legacy/Kconfig-268-\t The Mass Storage Gadget acts as a USB Mass Storage disk drive.\ndrivers/usb/gadget/legacy/Kconfig:269:\t As its storage repository it can use a regular file or a block\ndrivers/usb/gadget/legacy/Kconfig-270-\t device (in much the same way as the \"loop\" device driver),\n--\ndrivers/usb/gadget/legacy/Kconfig-273-\t This driver is a replacement for now removed File-backed\ndrivers/usb/gadget/legacy/Kconfig:274:\t Storage Gadget (g_file_storage).\ndrivers/usb/gadget/legacy/Kconfig-275-\ndrivers/usb/gadget/legacy/Kconfig-276-\t Say \"y\" to link the driver statically, or \"m\" to build\ndrivers/usb/gadget/legacy/Kconfig:277:\t a dynamically linked module called \"g_mass_storage\".\ndrivers/usb/gadget/legacy/Kconfig-278-\n--\ndrivers/usb/gadget/legacy/Kconfig=389=config USB_G_ACM_MS\ndrivers/usb/gadget/legacy/Kconfig:390:\ttristate \"CDC Composite Device (ACM and mass storage)\"\ndrivers/usb/gadget/legacy/Kconfig-391-\tdepends on BLOCK\n--\ndrivers/usb/gadget/legacy/Kconfig-397-\t This driver provides two functions in one configuration:\ndrivers/usb/gadget/legacy/Kconfig:398:\t a mass storage, and a CDC ACM (serial port) link.\ndrivers/usb/gadget/legacy/Kconfig-399-\n--\ndrivers/usb/gadget/legacy/Kconfig=403=config USB_G_MULTI\n--\ndrivers/usb/gadget/legacy/Kconfig-413-\t The Multifunction Composite Gadget provides Ethernet (RNDIS\ndrivers/usb/gadget/legacy/Kconfig:414:\t and/or CDC Ethernet), mass storage and ACM serial link\ndrivers/usb/gadget/legacy/Kconfig-415-\t interfaces.\n--\ndrivers/usb/gadget/legacy/Makefile=15=gadgetfs-y\t\t\t:= inode.o\ndrivers/usb/gadget/legacy/Makefile:16:g_mass_storage-y\t\t:= mass_storage.o\ndrivers/usb/gadget/legacy/Makefile-17-g_printer-y\t\t\t:= printer.o\n--\ndrivers/usb/gadget/legacy/Makefile=32=obj-$(CONFIG_USB_FUNCTIONFS)\t+= g_ffs.o\ndrivers/usb/gadget/legacy/Makefile:33:obj-$(CONFIG_USB_MASS_STORAGE)\t+= g_mass_storage.o\ndrivers/usb/gadget/legacy/Makefile-34-obj-$(CONFIG_USB_G_SERIAL)\t+= g_serial.o\n--\ndrivers/usb/gadget/legacy/acm_ms.c-2-/\ndrivers/usb/gadget/legacy/acm_ms.c:3: * acm_ms.c -- Composite driver, with ACM and mass storage support\ndrivers/usb/gadget/legacy/acm_ms.c-4- \n--\ndrivers/usb/gadget/legacy/acm_ms.c-29-\ndrivers/usb/gadget/legacy/acm_ms.c:30:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/acm_ms.c-31-\n--\ndrivers/usb/gadget/legacy/acm_ms.c=101=static struct usb_function f_msg;\n--\ndrivers/usb/gadget/legacy/acm_ms.c-103-/\ndrivers/usb/gadget/legacy/acm_ms.c:104: We _always_ have both ACM and mass storage functions.\ndrivers/usb/gadget/legacy/acm_ms.c-105- /\n--\ndrivers/usb/gadget/legacy/acm_ms.c=152=static int acm_ms_bind(struct usb_composite_dev cdev)\n--\ndrivers/usb/gadget/legacy/acm_ms.c-162-\ndrivers/usb/gadget/legacy/acm_ms.c:163:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/acm_ms.c-164-\tif (IS_ERR(fi_msg)) {\n--\ndrivers/usb/gadget/legacy/acm_ms.c-168-\ndrivers/usb/gadget/legacy/acm_ms.c:169:\t/* set up mass storage function /\ndrivers/usb/gadget/legacy/acm_ms.c-170-\tfsg_config_from_params(\u0026config, \u0026fsg_mod_data, fsg_num_buffers);\n--\ndrivers/usb/gadget/legacy/mass_storage.c-2-/\ndrivers/usb/gadget/legacy/mass_storage.c:3: * mass_storage.c -- Mass Storage USB Gadget\ndrivers/usb/gadget/legacy/mass_storage.c-4- \n--\ndrivers/usb/gadget/legacy/mass_storage.c-21- Since this file serves only administrative purposes and all the\ndrivers/usb/gadget/legacy/mass_storage.c:22: * business logic is implemented in f_mass_storage.* file. Read\ndrivers/usb/gadget/legacy/mass_storage.c-23- * comments in this file for more detailed description.\n--\ndrivers/usb/gadget/legacy/mass_storage.c-44-\ndrivers/usb/gadget/legacy/mass_storage.c:45:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/mass_storage.c-46-\n--\ndrivers/usb/gadget/legacy/mass_storage.c=139=static int msg_bind(struct usb_composite_dev cdev)\n--\ndrivers/usb/gadget/legacy/mass_storage.c-144-\ndrivers/usb/gadget/legacy/mass_storage.c:145:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/mass_storage.c-146-\tif (IS_ERR(fi_msg))\n--\ndrivers/usb/gadget/legacy/mass_storage.c=224=static struct usb_composite_driver msg_driver = {\ndrivers/usb/gadget/legacy/mass_storage.c:225:\t.name\t\t= \"g_mass_storage\",\ndrivers/usb/gadget/legacy/mass_storage.c-226-\t.dev\t\t= \u0026msg_device_desc,\n--\ndrivers/usb/gadget/legacy/multi.c=29=MODULE_LICENSE(\"GPL\");\n--\ndrivers/usb/gadget/legacy/multi.c-31-\ndrivers/usb/gadget/legacy/multi.c:32:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/multi.c-33-\n--\ndrivers/usb/gadget/legacy/multi.c=294=static int multi_bind(struct usb_composite_dev cdev)\n--\ndrivers/usb/gadget/legacy/multi.c-365-\ndrivers/usb/gadget/legacy/multi.c:366:\t/* set up mass storage function /\ndrivers/usb/gadget/legacy/multi.c:367:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/multi.c-368-\tif (IS_ERR(fi_msg)) {\n--\ndrivers/usb/gadget/legacy/nokia.c-22-#include \"u_ecm.h\"\ndrivers/usb/gadget/legacy/nokia.c:23:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/nokia.c-24-\n--\ndrivers/usb/gadget/legacy/nokia.c=267=static int nokia_bind(struct usb_composite_dev cdev)\n--\ndrivers/usb/gadget/legacy/nokia.c-311-\ndrivers/usb/gadget/legacy/nokia.c:312:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/nokia.c-313-\tif (IS_ERR(fi_msg)) {\n--\ndrivers/usb/gadget/legacy/nokia.c-317-\ndrivers/usb/gadget/legacy/nokia.c:318:\t/* set up mass storage function /\ndrivers/usb/gadget/legacy/nokia.c-319-\tfsg_config_from_params(\u0026fsg_config, \u0026fsg_mod_data, fsg_num_buffers);\n--\ndrivers/usb/gadget/legacy/tcm_usb_gadget.c-17-#include \u003clinux/usb/gadget.h\u003e\ndrivers/usb/gadget/legacy/tcm_usb_gadget.c:18:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/legacy/tcm_usb_gadget.c-19-#include \u003cscsi/scsi_tcq.h\u003e\n--\ndrivers/usb/gadget/udc/amd5536udc.h-51-\ndrivers/usb/gadget/udc/amd5536udc.h:52:/ Mass storage reset /\ndrivers/usb/gadget/udc/amd5536udc.h-53-#define UDC_MSCRES_DWORD0\t\t\t0x0000ff21\n--\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c=217=int ast_vhub_std_dev_request(struct ast_vhub_ep ep,\n--\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c-233-\t * we don't do that anymore as we seem to have cases of\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c:234:\t * mass storage getting very upset.\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c-235-\t /\n--\ndrivers/usb/gadget/udc/pch_udc.c=2307=static void pch_udc_svc_control_out(struct pch_udc_dev dev)\n--\ndrivers/usb/gadget/udc/pch_udc.c-2333-\t\t\tdev-\u003egadget.ep0 = \u0026ep-\u003eep;\ndrivers/usb/gadget/udc/pch_udc.c:2334:\t\t/* If Mass storage Reset /\ndrivers/usb/gadget/udc/pch_udc.c-2335-\t\tif ((dev-\u003esetup_data.bRequestType == 0x21) \u0026\u0026\n--\ndrivers/usb/gadget/udc/pxa25x_udc.c=720=read_fifo (struct pxa25x_ep ep, struct pxa25x_request req)\n--\ndrivers/usb/gadget/udc/pxa25x_udc.c-792- handshaking is magic. most device protocols don't need control-OUT.\ndrivers/usb/gadget/udc/pxa25x_udc.c:793: * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other\ndrivers/usb/gadget/udc/pxa25x_udc.c-794- * protocols do use them.\n--\ndrivers/usb/gadget/udc/pxa27x_udc.c-60- * - zero gadget\ndrivers/usb/gadget/udc/pxa27x_udc.c:61: * - file storage gadget\ndrivers/usb/gadget/udc/pxa27x_udc.c-62- * - ether gadget\n--\ndrivers/usb/gadget/udc/pxa27x_udc.c=2292=static struct pxa_udc memory = {\n--\ndrivers/usb/gadget/udc/pxa27x_udc.c-2315-\t\tPXA_EP_IN_BULK(2, 2, 3, 0, 0),\ndrivers/usb/gadget/udc/pxa27x_udc.c:2316:\t\t/* Endpoints for ether gadget, file storage gadget /\ndrivers/usb/gadget/udc/pxa27x_udc.c-2317-\t\tPXA_EP_OUT_BULK(3, 1, 1, 0, 0),\n--\ndrivers/usb/gadget/udc/pxa27x_udc.h=411=struct udc_stats {\n--\ndrivers/usb/gadget/udc/pxa27x_udc.h-426- @usb_gadget: udc gadget structure\ndrivers/usb/gadget/udc/pxa27x_udc.h:427: * @driver: bound gadget (zero, g_ether, g_mass_storage, ...)\ndrivers/usb/gadget/udc/pxa27x_udc.h-428- * @dev: device\n--\ndrivers/usb/gadget/udc/snps_udc_core.c=1755=static void udc_handle_halt_state(struct udc_ep ep)\n--\ndrivers/usb/gadget/udc/snps_udc_core.c-1766-\t\t\t we would set STALL again here to be compliant.\ndrivers/usb/gadget/udc/snps_udc_core.c:1767:\t\t\t * But with current mass storage drivers this does\ndrivers/usb/gadget/udc/snps_udc_core.c-1768-\t\t\t * not work (would produce endless host retries).\n--\ndrivers/usb/gadget/udc/snps_udc_core.c=2425=__acquires(dev-\u003elock)\n--\ndrivers/usb/gadget/udc/snps_udc_core.c-2520-\t\t/\ndrivers/usb/gadget/udc/snps_udc_core.c:2521:\t\t mass storage reset must be processed here because\ndrivers/usb/gadget/udc/snps_udc_core.c-2522-\t\t * next packet may be a CLEAR_FEATURE HALT which would not\n--\ndrivers/usb/gadget/udc/udc-xilinx.c=376=static int xudc_dma_send(struct xusb_ep ep, struct xusb_req req,\n--\ndrivers/usb/gadget/udc/udc-xilinx.c-421- * @req: pointer to the usb request structure.\ndrivers/usb/gadget/udc/udc-xilinx.c:422: * @buffer: pointer to storage buffer of received data.\ndrivers/usb/gadget/udc/udc-xilinx.c-423- * @length: number of bytes to receive.\n--\ndrivers/usb/host/ehci-hcd.c=454=static int ehci_init(struct usb_hcd hcd)\n--\ndrivers/usb/host/ehci-hcd.c-544-\t\t \ndrivers/usb/host/ehci-hcd.c:545:\t\t * With fast usb storage devices and NForce2, \"park\" seems to\ndrivers/usb/host/ehci-hcd.c-546-\t\t * make problems: throughput reduction (!), data errors...\n--\ndrivers/usb/host/oxu210hp-hcd.c=2985=static int oxu_hcd_init(struct usb_hcd hcd)\n--\ndrivers/usb/host/oxu210hp-hcd.c-3039-\t\t \ndrivers/usb/host/oxu210hp-hcd.c:3040:\t\t * With fast usb storage devices and NForce2, \"park\" seems to\ndrivers/usb/host/oxu210hp-hcd.c-3041-\t\t * make problems: throughput reduction (!), data errors...\n--\ndrivers/usb/host/pci-quirks.c=1030=static int handshake(void __iomem ptr, u32 mask, u32 done,\n--\ndrivers/usb/host/pci-quirks.c-1047- start. This avoids active devices under EHCI being disconnected during the\ndrivers/usb/host/pci-quirks.c:1048: * port switchover, which could cause loss of data on USB storage devices, or\ndrivers/usb/host/pci-quirks.c:1049: * failed boot when the root file system is on a USB mass storage device and is\ndrivers/usb/host/pci-quirks.c-1050- * enumerated under EHCI first.\n--\ndrivers/usb/host/sl811-hcd.c-22- * Status: Passed basic stress testing, works with hubs, mice, keyboards,\ndrivers/usb/host/sl811-hcd.c:23: * and usb-storage.\ndrivers/usb/host/sl811-hcd.c-24- \n--\ndrivers/usb/host/xhci.c=3543=static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd xhci,\n--\ndrivers/usb/host/xhci.c-3586- * core) to prepare a set of bulk endpoints to use streams. Streams are used to\ndrivers/usb/host/xhci.c:3587: * coordinate mass storage command queueing across multiple endpoints (basically\ndrivers/usb/host/xhci.c-3588- * a stream ID == a task ID).\n--\ndrivers/usb/host/xhci.c=4202=int xhci_alloc_dev(struct usb_hcd hcd, struct usb_device udev)\n--\ndrivers/usb/host/xhci.c-4253-\t * xhci_discover_or_reset_device(), which may be called as part of\ndrivers/usb/host/xhci.c:4254:\t * mass storage driver error handling.\ndrivers/usb/host/xhci.c-4255-\t /\n--\ndrivers/usb/host/xhci.h=652=struct xhci_virt_ep {\n--\ndrivers/usb/host/xhci.h-657-\tstruct xhci_stream_info\t\tstream_info;\ndrivers/usb/host/xhci.h:658:\t/* Temporary storage in case the configure endpoint command fails and we\ndrivers/usb/host/xhci.h-659-\t * have to restore the device state to the previous state\n--\ndrivers/usb/host/xhci.h-692-\tbool\t\t\tskip;\ndrivers/usb/host/xhci.h:693:\t/* Bandwidth checking storage /\ndrivers/usb/host/xhci.h-694-\tstruct xhci_bw_info\tbw_info;\n--\ndrivers/usb/host/xhci.h-696-\tunsigned long\t\tstop_time;\ndrivers/usb/host/xhci.h:697:\t/ Isoch Frame ID checking storage /\ndrivers/usb/host/xhci.h-698-\tint\t\t\tnext_frame_id;\n--\ndrivers/usb/image/microtek.c-6- \ndrivers/usb/image/microtek.c:7: * Parts shamelessly stolen from usb-storage and copyright by their\ndrivers/usb/image/microtek.c-8- * authors. Thanks to Matt Dharm for giving us permission!\n--\ndrivers/usb/image/microtek.c=522=mts_build_transfer_context(struct scsi_cmnd srb, struct mts_desc desc)\n--\ndrivers/usb/image/microtek.c-543-\ndrivers/usb/image/microtek.c:544:\t/* Brutally ripped from usb-storage /\ndrivers/usb/image/microtek.c-545-\n--\ndrivers/usb/isp1760/isp1760-hcd.c=1770=static void packetize_urb(struct usb_hcd hcd,\n--\ndrivers/usb/isp1760/isp1760-hcd.c-1784-\tif (!urb-\u003etransfer_buffer \u0026\u0026 urb-\u003etransfer_buffer_length) {\ndrivers/usb/isp1760/isp1760-hcd.c:1785:\t\t/* XXX This looks like usb storage / SCSI bug /\ndrivers/usb/isp1760/isp1760-hcd.c-1786-\t\tdev_err(hcd-\u003eself.controller,\n--\ndrivers/usb/musb/musb_gadget.c=519=static void rxstate(struct musb musb, struct musb_request req)\n--\ndrivers/usb/musb/musb_gadget.c-589-\t\t is set. Currently short_not_ok flag is set only from\ndrivers/usb/musb/musb_gadget.c:590:\t\t * file_storage and f_mass_storage drivers\ndrivers/usb/musb/musb_gadget.c-591-\t\t /\n--\ndrivers/usb/musb/musb_gadget.c-615-\t We could operate in DMA mode 1 if we knew the size of the transfer\ndrivers/usb/musb/musb_gadget.c:616:\t * in advance. For mass storage class, request-\u003elength = what the host\ndrivers/usb/musb/musb_gadget.c-617-\t * sends, so that'd work. But for pretty much everything else,\n--\ndrivers/usb/musb/musb_gadget.c-627-\t \ndrivers/usb/musb/musb_gadget.c:628:\t REVISIT an updated g_file_storage can set req-\u003eshort_not_ok, which\ndrivers/usb/musb/musb_gadget.c-629-\t * then becomes usable as a runtime \"use mode 1\" hint...\n--\ndrivers/usb/musb/musb_gadget.c-631-\ndrivers/usb/musb/musb_gadget.c:632:\t\t\t\t/* Experimental: Mode1 works with mass storage use cases /\ndrivers/usb/musb/musb_gadget.c-633-\t\t\t\tif (use_mode_1) {\n--\ndrivers/usb/musb/musb_gadget_ep0.c=641=irqreturn_t musb_g_ep0_irq(struct musb musb)\n--\ndrivers/usb/musb/musb_gadget_ep0.c-871-\t\t/* This should not happen. But happens with tusb6010 with\ndrivers/usb/musb/musb_gadget_ep0.c:872:\t\t * g_file_storage and high speed. Do nothing.\ndrivers/usb/musb/musb_gadget_ep0.c-873-\t\t /\n--\ndrivers/usb/musb/musb_host.c=1489=static inline int musb_rx_dma_iso_cppi41(struct dma_controller dma,\n--\ndrivers/usb/musb/musb_host.c-1530- \ndrivers/usb/musb/musb_host.c:1531: \tSo for example, usb-storage sets URB_SHORT_NOT_OK, and would\ndrivers/usb/musb/musb_host.c-1532- \tthus be a great candidate for using mode 1 ... for all but the\n--\ndrivers/usb/musb/musb_host.c=1535=static int musb_rx_dma_inventra_cppi41(struct dma_controller dma,\n--\ndrivers/usb/musb/musb_host.c-1589-/* Disadvantage of using mode 1:\ndrivers/usb/musb/musb_host.c:1590: \tIt's basically usable only for mass storage class; essentially all\ndrivers/usb/musb/musb_host.c-1591- \tother protocols also terminate transfers on short packets.\n--\ndrivers/usb/serial/f81534.c=762=static bool f81534_check_port_hw_disabled(struct usb_serial serial, int phy)\n--\ndrivers/usb/serial/f81534.c-819-/\ndrivers/usb/serial/f81534.c:820: * We had 2 generation of F81532/534 IC. All has an internal storage.\ndrivers/usb/serial/f81534.c-821- \n--\ndrivers/usb/serial/f81534.c-823- internal data will used. All mode and gpio control should manually set\ndrivers/usb/serial/f81534.c:824: * by AP or Driver and all storage space value are 0xff. The\ndrivers/usb/serial/f81534.c-825- * f81534_calc_num_ports() will run to final we marked as \"oldest version\"\n--\ndrivers/usb/storage/Kconfig=8=config USB_STORAGE\n--\ndrivers/usb/storage/Kconfig-11-\thelp\ndrivers/usb/storage/Kconfig:12:\t Say Y here if you want to connect USB mass storage devices to your\ndrivers/usb/storage/Kconfig-13-\t computer's USB port. This is the driver you need for USB\n--\ndrivers/usb/storage/Kconfig-20-\t probably also need 'SCSI device support: SCSI disk support'\ndrivers/usb/storage/Kconfig:21:\t (BLK_DEV_SD) for most USB storage devices.\ndrivers/usb/storage/Kconfig-22-\ndrivers/usb/storage/Kconfig-23-\t To compile this driver as a module, choose M here: the\ndrivers/usb/storage/Kconfig:24:\t module will be called usb-storage.\ndrivers/usb/storage/Kconfig-25-\n--\ndrivers/usb/storage/Kconfig=80=config USB_STORAGE_USBAT\ndrivers/usb/storage/Kconfig:81:\ttristate \"USBAT/USBAT02-based storage support\"\ndrivers/usb/storage/Kconfig-82-\thelp\ndrivers/usb/storage/Kconfig:83:\t Say Y here to include additional code to support storage devices\ndrivers/usb/storage/Kconfig-84-\t based on the SCM/Shuttle USBAT/USBAT02 processors.\n--\ndrivers/usb/storage/Kconfig=152=config USB_STORAGE_KARMA\n--\ndrivers/usb/storage/Kconfig-157-\ndrivers/usb/storage/Kconfig:158:\t This code places the Rio Karma into mass storage mode, enabling\n\n" }
23/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30875 output: 34 thoughts: 17 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Diving into the Kconfig - USB Drivers Okay, time to get to the heart of the matter. Based on the task at hand, I need to get into the nitty-gritty configuration. I'm going to start by focusing on the `drivers/usb/Kconfig` file. I'll zero in around line 116. This is generally where the core USB driver configuration options tend to reside. From experience, this section often contains the conditional dependencies and options that govern the enabling or disabling of specific USB features or controller support. It will be the jump off point to see what can be configured, and what the dependencies are.
24/2	2026/09/16 21:42	tool	read-file	0m Args: { "File": "drivers/usb/Kconfig", "FirstLine": 110, "LineCount": 20 } Results: { "Contents": " 110:\tsource \"drivers/usb/host/Kconfig\"\n 111:\t\n 112:\tsource \"drivers/usb/renesas_usbhs/Kconfig\"\n 113:\t\n 114:\tsource \"drivers/usb/class/Kconfig\"\n 115:\t\n 116:\tsource \"drivers/usb/storage/Kconfig\"\n 117:\t\n 118:\tsource \"drivers/usb/image/Kconfig\"\n 119:\t\n 120:\tsource \"drivers/usb/usbip/Kconfig\"\n 121:\t\n 122:\tendif\n 123:\t\n 124:\tcomment \"USB dual-mode controller drivers\"\n 125:\t\n 126:\tsource \"drivers/usb/cdns3/Kconfig\"\n 127:\t\n 128:\tsource \"drivers/usb/fotg210/Kconfig\"\n 129:\t\n" }
25/2	2026/09/16 21:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 31343 output: 149 thoughts: 1769 Thoughts: Fuzzing Analysis for USB Storage Driver Patch Alright, let's break this down. First, the code: the patch resides within the USB storage subsystem, specifically the `sierra_ms` module. We need to ensure `USB_STORAGE`, `USB` (or `USB_SUPPORT`), and `SCSI` are enabled in the kernel configuration. I've double-checked that those dependencies are correctly reflected in the Kconfig and Makefile files. The crucial function modified is `sierra_get_swoc_info`. It's statically defined, but used in `sierra_ms_init` and `truinst_show`. My immediate concern is: Is this code actually reachable? Syzkaller's USB emulation (specifically Raw Gadget) provides a positive answer. It simulates USB devices, and when it emulates a Sierra device, the USB storage driver binds and calls `sierra_ms_init`. This means the functions are exercised in a controlled, emulated environment. The patch introduces a check on the number of bytes returned by a control request, guarding against the use of uninitialized data which is a good thing and could be tested by fuzzing. Now, considering the patch's impact, the fuzzing criteria: We're introducing a defensive check, which is a prime target for fuzzing. This patch modifies reachable code that's used via virtual USB buses emulated in standard QEMU. Given the focus on error handling and the potential for regressions related to how incomplete responses are handled, I'm confident we have a valid target. It avoids the negative criteria as well as we can reach the drivers using a standard USB Gadget. Therefore, the "WorthFuzzing" flag should be set to TRUE. For `FocusSymbols`, I'll list the key functions involved: `sierra_get_swoc_info` (even though it's static, it's a specific entry point in the execution flow), `sierra_ms_init` (the initialization function, exported) and `truinst_show` because it's relevant to a potential regression as well. In summary: * `EnableConfigs`: `["USB_STORAGE", "USB", "SCSI"]` * `FocusSymbols`: `["sierra_get_swoc_info", "sierra_ms_init", "truinst_show"]` * `WorthFuzzing`: `true` * `Reasoning`: The patch modifies reachable code within a USB storage driver. The new check can be exercised through USB emulation and could reveal regressions in error handling.
26/2	2026/09/16 21:43	tool	set-results	0m Args: { "EnableConfigs": [ "USB_STORAGE", "USB", "SCSI" ], "FocusSymbols": [ "sierra_get_swoc_info", "sierra_ms_init", "truinst_show" ], "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "USB_STORAGE", "USB", "SCSI" ], "FocusSymbols": [ "sierra_get_swoc_info", "sierra_ms_init", "truinst_show" ], "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.", "WorthFuzzing": true }
27/1	2026/09/16 21:43	action	If	0m Args: { "WorthFuzzing": true } Results: null
28/2	2026/09/16 21:43	agent	kmsan-evaluator	0m Model: core Args: null Results: { "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, 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 8176a97483e2ad011dcc3443b1fcdd8fc17fc6d7 Author: syz-cluster <triage@syzkaller.com> Date: Wed Sep 16 21:42:05 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c index 177fa6cd143ab..8755fda42eed2 100644 --- a/drivers/usb/storage/sierra_ms.c +++ b/drivers/usb/storage/sierra_ms.c @@ -76,6 +76,12 @@ static int sierra_get_swoc_info(struct usb_device udev, (void ) swocInfo, /* void data / sizeof(struct swoc_info), /* __u16 size / USB_CTRL_SET_TIMEOUT); / int timeout / + / + * A short IN transfer leaves the tail of swocInfo uninitialized; + * only a full transfer is valid. + */ + if (result != sizeof(struct swoc_info)) + return -EIO; swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU); swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer);
29/3	2026/09/16 21:43	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2170 output: 39 thoughts: 65 Thoughts: Analyzing the Sierra MS Driver Patch Okay, so the user wants me to dive into a patch affecting the `drivers/usb/storage/sierra_ms.c` file. Right, let's get down to brass tacks. My initial thought is to, of course, understand the context. I'll need to see the actual patch first, to be able to assess its impact. But, before I even get into that, let me ensure I have a good grasp of the surrounding code for that file, specifically around line 76 – that seems like a good place to start my investigation. Let's start with a `read-file` command to load up the relevant section of `sierra_ms.c` and take a look. From that, I can get a feel for what might be impacted by this patch, any dependencies or interactions it may have with other parts of the driver, and formulate some hypotheses about its purpose.
30/3	2026/09/16 21:43	tool	read-file	0m Args: { "File": "drivers/usb/storage/sierra_ms.c", "FirstLine": 50, "LineCount": 80 } Results: { "Contents": " 50:\t\tint result;\n 51:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: %s\", \"DEVICE MODE SWITCH\\n\");\n 52:\t\tresult = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),\n 53:\t\t\t\tSWIMS_USB_REQUEST_SetSwocMode,\t/* __u8 request /\n 54:\t\t\t\tUSB_TYPE_VENDOR \| USB_DIR_OUT,\t/ __u8 request type /\n 55:\t\t\t\teSWocMode,\t\t\t/ __u16 value /\n 56:\t\t\t\t0x0000,\t\t\t\t/ __u16 index /\n 57:\t\t\t\tNULL,\t\t\t\t/ void data /\n 58:\t\t\t\t0,\t\t\t\t/* __u16 size \t /\n 59:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/ int timeout /\n 60:\t\treturn result;\n 61:\t}\n 62:\t\n 63:\t\n 64:\tstatic int sierra_get_swoc_info(struct usb_device udev,\n 65:\t\t\t\t\tstruct swoc_info swocInfo)\n 66:\t{\n 67:\t\tint result;\n 68:\t\n 69:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: Attempting to get TRU-Install info\\n\");\n 70:\t\n 71:\t\tresult = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),\n 72:\t\t\t\tSWIMS_USB_REQUEST_GetSwocInfo,\t/ __u8 request /\n 73:\t\t\t\tUSB_TYPE_VENDOR \| USB_DIR_IN,\t/ __u8 request type /\n 74:\t\t\t\t0,\t\t\t\t/ __u16 value /\n 75:\t\t\t\t0,\t\t\t\t/ __u16 index /\n 76:\t\t\t\t(void ) swocInfo,\t\t/* void data /\n 77:\t\t\t\tsizeof(struct swoc_info),\t/* __u16 size \t /\n 78:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/ int timeout \t /\n 79:\t\t/\n 80:\t\t * A short IN transfer leaves the tail of swocInfo uninitialized;\n 81:\t\t * only a full transfer is valid.\n 82:\t\t /\n 83:\t\tif (result != sizeof(struct swoc_info))\n 84:\t\t\treturn -EIO;\n 85:\t\n 86:\t\tswocInfo-\u003eLinuxSKU = le16_to_cpu(swocInfo-\u003eLinuxSKU);\n 87:\t\tswocInfo-\u003eLinuxVer = le16_to_cpu(swocInfo-\u003eLinuxVer);\n 88:\t\treturn result;\n 89:\t}\n 90:\t\n 91:\tstatic void debug_swoc(const struct device dev, struct swoc_info swocInfo)\n 92:\t{\n 93:\t\tdev_dbg(dev, \"SWIMS: SWoC Rev: %02d\\n\", swocInfo-\u003erev);\n 94:\t\tdev_dbg(dev, \"SWIMS: Linux SKU: %04X\\n\", swocInfo-\u003eLinuxSKU);\n 95:\t\tdev_dbg(dev, \"SWIMS: Linux Version: %04X\\n\", swocInfo-\u003eLinuxVer);\n 96:\t}\n 97:\t\n 98:\t\n 99:\tstatic ssize_t truinst_show(struct device dev, struct device_attribute attr,\n 100:\t\t\t\tchar buf)\n 101:\t{\n 102:\t\tstruct swoc_info swocInfo;\n 103:\t\tstruct usb_interface intf = to_usb_interface(dev);\n 104:\t\tstruct usb_device *udev = interface_to_usbdev(intf);\n 105:\t\tint result;\n 106:\t\tif (swi_tru_install == TRU_FORCE_MS) {\n 107:\t\t\tresult = sysfs_emit(buf, \"Forced Mass Storage\\n\");\n 108:\t\t} else {\n 109:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);\n 110:\t\t\tif (!swocInfo) {\n 111:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 112:\t\t\t\treturn -ENOMEM;\n 113:\t\t\t}\n 114:\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 115:\t\t\tif (result \u003c 0) {\n 116:\t\t\t\tdev_dbg(dev, \"SWIMS: failed SWoC query\\n\");\n 117:\t\t\t\tkfree(swocInfo);\n 118:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 119:\t\t\t\treturn -EIO;\n 120:\t\t\t}\n 121:\t\t\tdebug_swoc(dev, swocInfo);\n 122:\t\t\tresult = sysfs_emit(buf,\n 123:\t\t\t\t\t \"REV=%02d SKU=%04X VER=%04X\\n\",\n 124:\t\t\t\t\t swocInfo-\u003erev,\n 125:\t\t\t\t\t swocInfo-\u003eLinuxSKU,\n 126:\t\t\t\t\t swocInfo-\u003eLinuxVer);\n 127:\t\t\tkfree(swocInfo);\n 128:\t\t}\n 129:\t\treturn result;\n" }
31/3	2026/09/16 21:43	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3835 output: 40 thoughts: 21 Thoughts: Okay, let's dive into the rest of `drivers/usb/storage/sierra_ms.c`. I need to get a clear picture of how this driver handles Mass Storage devices from Sierra Wireless modems, specifically. I know this file likely contains the critical functions for initializing the device, managing its communication with the USB interface, and interpreting the SCSI commands related to storage operations. I need to understand how it deals with device-specific quirks or workarounds, as I'm sure there are plenty. I'm especially interested in whether it uses any custom vendor-specific commands, or relies solely on standard SCSI commands. I'll be looking for the standard functions: probe, disconnect, and the bulk transfer implementations for data in and data out and whether or not it handles multiple LUNs. I want to see how the code handles error conditions, particularly those common with unreliable mobile devices. I'll pay close attention to the use of any specific USB request blocks (URBs) or data structures, any vendor specific USB endpoints. I will check for any unusual data buffering techniques. Any power management considerations? I will check for any issues. I'll be looking for ways to improve performance, add device support, or address any known bugs.
32/3	2026/09/16 21:43	tool	read-file	0m Args: { "File": "drivers/usb/storage/sierra_ms.c", "FirstLine": 130, "LineCount": 60 } Results: { "Contents": " 130:\t}\n 131:\tstatic DEVICE_ATTR_RO(truinst);\n 132:\t\n 133:\tint sierra_ms_init(struct us_data us)\n 134:\t{\n 135:\t\tint result, retries;\n 136:\t\tstruct swoc_info swocInfo;\n 137:\t\tstruct usb_device udev;\n 138:\t\n 139:\t\tudev = us-\u003epusb_dev;\n 140:\t\n 141:\t\t/ Force Modem mode /\n 142:\t\tif (swi_tru_install == TRU_FORCE_MODEM) {\n 143:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Modem Mode\\n\");\n 144:\t\t\tresult = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem);\n 145:\t\t\tif (result \u003c 0)\n 146:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed to switch to modem mode\\n\");\n 147:\t\t\treturn -EIO;\n 148:\t\t}\n 149:\t\t/ Force Mass Storage mode (keep CD-Rom) /\n 150:\t\telse if (swi_tru_install == TRU_FORCE_MS) {\n 151:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Mass Storage Mode\\n\");\n 152:\t\t\tgoto complete;\n 153:\t\t}\n 154:\t\t/ Normal TRU-Install Logic /\n 155:\t\telse {\n 156:\t\t\tusb_stor_dbg(us, \"SWIMS: Normal SWoC Logic\\n\");\n 157:\t\n 158:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info),\n 159:\t\t\t\t\tGFP_KERNEL);\n 160:\t\t\tif (!swocInfo)\n 161:\t\t\t\treturn -ENOMEM;\n 162:\t\n 163:\t\t\tretries = 3;\n 164:\t\t\tdo {\n 165:\t\t\t\tretries--;\n 166:\t\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 167:\t\t\t\tif (result \u003c 0) {\n 168:\t\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed SWoC query\\n\");\n 169:\t\t\t\t\tschedule_timeout_uninterruptible(2HZ);\n 170:\t\t\t\t}\n 171:\t\t\t} while (retries \u0026\u0026 result \u003c 0);\n 172:\t\n 173:\t\t\tif (result \u003c 0) {\n 174:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Completely failed SWoC query\\n\");\n 175:\t\t\t\tkfree(swocInfo);\n 176:\t\t\t\treturn -EIO;\n 177:\t\t\t}\n 178:\t\n 179:\t\t\tdebug_swoc(\u0026us-\u003epusb_dev-\u003edev, swocInfo);\n 180:\t\n 181:\t\t\t/\n 182:\t\t\t If there is not Linux software on the TRU-Install device\n 183:\t\t\t * then switch to modem mode\n 184:\t\t\t */\n 185:\t\t\tif (!containsFullLinuxPackage(swocInfo)) {\n 186:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Switching to Modem Mode\\n\");\n 187:\t\t\t\tresult = sierra_set_ms_mode(udev,\n 188:\t\t\t\t\tSWIMS_SET_MODE_Modem);\n 189:\t\t\t\tif (result \u003c 0)\n" }
33/3	2026/09/16 21:43	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5075 output: 19 thoughts: 2023 Thoughts: Analysis of the SWIMS SWoC Information Retrieval Patch Okay, let's break this down. My initial assessment is that this patch fixes a potential uninitialized memory read, not introduces one. The code, before the patch, calls `usb_control_msg` to retrieve SWoC information into a `swocInfo` struct. The critical point is that `usb_control_msg` returns the number of bytes transferred. If the transfer is short, the tail of `swocInfo` would be uninitialized, leading to a possible uninitialized read later. The patch explicitly addresses this by adding a check: if the returned size from `usb_control_msg` isn't the full `sizeof(struct swoc_info)`, the function now returns `-EIO`, preventing access to the uninitialized data. The previous logic would proceed to read `swocInfo->LinuxSKU` and potentially perform operations on potentially garbage data, which the patch prevents. Subsequent code paths, in `truinst_show` and `sierra_ms_init`, correctly handle the `-EIO` error by freeing the allocated `swocInfo` and returning `-EIO`. This is the correct behavior because `usb_control_msg` either successfully transfers the entire struct, leaving all members initialized, or it returns an error and aborts. The key question is whether this warrants a dedicated KMSAN session. The instructions are very clear: KMSAN is only needed if the code changes introduce or expose uninitialized memory risks that are detected ONLY by KMSAN. This patch removes an uninitialized read scenario. It doesn't introduce any new risks, nor does it modify structures sent to userspace, introduce conditional logic based on potentially uninitialized fields, modify allocation or initialization of complex data structures, or change bounds checks in a way that allows access to uninitialized data. While the patch is a fix that may have been triggered by KMSAN or other bug detectors, it does not itself introduce a new KMSAN problem. I'm confident that KASAN or other standard bug detectors are sufficient for this patch and the scenario it addresses. Therefore, `NeedsKMSAN` should be set to `false`. I would still need to review the structure definition to ensure my analysis is complete, but I am confident.
34/3	2026/09/16 21:43	tool	grepper	0m Args: { "Expression": "struct swoc_info" } Results: { "Output": "drivers/usb/storage/sierra_ms.c=28=MODULE_PARM_DESC(swi_tru_install, \"TRU-Install mode (1=Full Logic (def),\"\n--\ndrivers/usb/storage/sierra_ms.c-30-\ndrivers/usb/storage/sierra_ms.c:31:struct swoc_info {\ndrivers/usb/storage/sierra_ms.c-32-\t__u8 rev;\n--\ndrivers/usb/storage/sierra_ms.c-38-\ndrivers/usb/storage/sierra_ms.c:39:static bool containsFullLinuxPackage(struct swoc_info swocInfo)\ndrivers/usb/storage/sierra_ms.c-40-{\n--\ndrivers/usb/storage/sierra_ms.c=64=static int sierra_get_swoc_info(struct usb_device udev,\ndrivers/usb/storage/sierra_ms.c:65:\t\t\t\tstruct swoc_info swocInfo)\ndrivers/usb/storage/sierra_ms.c-66-{\n--\ndrivers/usb/storage/sierra_ms.c-76-\t\t\t(void ) swocInfo,\t\t/* void data /\ndrivers/usb/storage/sierra_ms.c:77:\t\t\tsizeof(struct swoc_info),\t/* __u16 size \t /\ndrivers/usb/storage/sierra_ms.c-78-\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/ int timeout \t /\n--\ndrivers/usb/storage/sierra_ms.c-82-\t /\ndrivers/usb/storage/sierra_ms.c:83:\tif (result != sizeof(struct swoc_info))\ndrivers/usb/storage/sierra_ms.c-84-\t\treturn -EIO;\n--\ndrivers/usb/storage/sierra_ms.c-90-\ndrivers/usb/storage/sierra_ms.c:91:static void debug_swoc(const struct device dev, struct swoc_info swocInfo)\ndrivers/usb/storage/sierra_ms.c-92-{\n--\ndrivers/usb/storage/sierra_ms.c=99=static ssize_t truinst_show(struct device dev, struct device_attribute attr,\n--\ndrivers/usb/storage/sierra_ms.c-101-{\ndrivers/usb/storage/sierra_ms.c:102:\tstruct swoc_info swocInfo;\ndrivers/usb/storage/sierra_ms.c-103-\tstruct usb_interface intf = to_usb_interface(dev);\n--\ndrivers/usb/storage/sierra_ms.c-108-\t} else {\ndrivers/usb/storage/sierra_ms.c:109:\t\tswocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);\ndrivers/usb/storage/sierra_ms.c-110-\t\tif (!swocInfo) {\n--\ndrivers/usb/storage/sierra_ms.c=133=int sierra_ms_init(struct us_data us)\n--\ndrivers/usb/storage/sierra_ms.c-135-\tint result, retries;\ndrivers/usb/storage/sierra_ms.c:136:\tstruct swoc_info swocInfo;\ndrivers/usb/storage/sierra_ms.c-137-\tstruct usb_device *udev;\n--\ndrivers/usb/storage/sierra_ms.c-157-\ndrivers/usb/storage/sierra_ms.c:158:\t\tswocInfo = kmalloc(sizeof(struct swoc_info),\ndrivers/usb/storage/sierra_ms.c-159-\t\t\t\tGFP_KERNEL);\n" }
35/3	2026/09/16 21:43	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8540 output: 39 thoughts: 26 Thoughts: Here's a summary of my thought process, as if I were analyzing that specific code section: Analyzing `sierra_ms.c` (Lines 30-45) Alright, let's dive into lines 30-45 of `drivers/usb/storage/sierra_ms.c`. My initial expectation is this section likely deals with device setup or perhaps probing of some kind, given the file path and driver name. The "ms" in `sierra_ms.c` strongly suggests this driver handles mass storage devices from Sierra Wireless, which are often used in cellular modems. So, I'm expecting to see code specific to that vendor's hardware. Now, I need to look closely for anything that immediately jumps out. Specifically, I'm watching for: * Any mention of specific USB descriptors. Are they identifying the Sierra device? What are the bInterfaceClass, bInterfaceSubClass, and bInterfaceProtocol values defined here? * Do I see the code checking for a particular USB VID/PID combination? Is it specifically looking for Sierra devices, and what version, or does it try to generalize a bit? This will be crucial. * Are there any data structures or function calls that suggest an initial setup sequence? I'm hoping to see how the code identifies the mass storage LUN(s). * Any error handling or conditional logic is also very important. What's the fall-back behavior if something goes wrong during the initialization? * Are there any assumptions made about the device configuration? Does the code take into account the various ways in which the device is configured. This is all to get a high-level understanding of what happens when the device is first plugged in. I need to understand how the driver determines whether this is a Sierra device and, if so, how it handles the initial setup. My goal is to quickly grasp the logical flow of this part of the driver. Let's see what's actually in those lines...
36/3	2026/09/16 21:43	tool	read-file	0m Args: { "File": "drivers/usb/storage/sierra_ms.c", "FirstLine": 30, "LineCount": 20 } Results: { "Contents": " 30:\t\n 31:\tstruct swoc_info {\n 32:\t\t__u8 rev;\n 33:\t\t__u8 reserved[8];\n 34:\t\t__u16 LinuxSKU;\n 35:\t\t__u16 LinuxVer;\n 36:\t\t__u8 reserved2[47];\n 37:\t} __attribute__((__packed__));\n 38:\t\n 39:\tstatic bool containsFullLinuxPackage(struct swoc_info swocInfo)\n 40:\t{\n 41:\t\tif ((swocInfo-\u003eLinuxSKU \u003e= 0x2100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x2FFF) \|\|\n 42:\t\t (swocInfo-\u003eLinuxSKU \u003e= 0x7100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x7FFF))\n 43:\t\t\treturn true;\n 44:\t\telse\n 45:\t\t\treturn false;\n 46:\t}\n 47:\t\n 48:\tstatic int sierra_set_ms_mode(struct usb_device udev, __u16 eSWocMode)\n 49:\t{\n" }
37/3	2026/09/16 21:43	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9330 output: 167 thoughts: 388 Thoughts: My Analysis of the Uninitialized Memory Fix Alright, let's break this down. That `struct swoc_info` is 60 bytes, I see that right away. And here's the core issue: the `usb_control_msg` call, when it short-reads, leaves the tail of that `swoc_info` structure filled with uninitialized heap memory allocated by `kmalloc()`. Then, fields like `swocInfo->LinuxSKU` and `swocInfo->LinuxVer`, at offsets 9 and 11, and possibly others, get read before they're properly set. This data could leak into sysfs or be used in `containsFullLinuxPackage(swocInfo)`, and that's a security risk. The patch itself is simple but effective. It introduces this essential check: ```c if (result != sizeof(struct swoc_info)) return -EIO; ``` Basically, if the `usb_control_msg` doesn't return the full expected structure, it returns an error. This prevents any of that partially initialized data from ever being used. The function now ensures a complete read before processing, which eliminates the potential read of uninitialized data. As for KMSAN, I concur. The patch addresses an existing uninitialized memory vulnerability by adding this check. It's not creating new memory, passing uninitialized kernel structures to user space, nor altering any boundaries. It's simply ensuring a complete read. Therefore, no KMSAN fuzzing is necessary here, it's a closed loop, problem solved. The patch directly targets the source of the issue without introducing any new areas for concern.
38/3	2026/09/16 21:43	tool	set-results	0m Args: { "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false }

{
  "EnableConfigs": [
    "USB_STORAGE",
    "USB",
    "SCSI"
  ],
  "FocusSymbols": [
    "sierra_get_swoc_info",
    "sierra_ms_init",
    "truinst_show"
  ],
  "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit 8176a97483e2ad011dcc3443b1fcdd8fc17fc6d7\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Sep 16 21:42:05 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c\nindex 177fa6cd143ab..8755fda42eed2 100644\n--- a/drivers/usb/storage/sierra_ms.c\n+++ b/drivers/usb/storage/sierra_ms.c\n@@ -76,6 +76,12 @@ static int sierra_get_swoc_info(struct usb_device *udev,\n \t\t\t(void *) swocInfo,\t\t/* void *data        */\n \t\t\tsizeof(struct swoc_info),\t/* __u16 size \t     */\n \t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/* int timeout \t     */\n+\t/*\n+\t * A short IN transfer leaves the tail of swocInfo uninitialized;\n+\t * only a full transfer is valid.\n+\t */\n+\tif (result != sizeof(struct swoc_info))\n+\t\treturn -EIO;\n \n \tswocInfo-\u003eLinuxSKU = le16_to_cpu(swocInfo-\u003eLinuxSKU);\n \tswocInfo-\u003eLinuxVer = le16_to_cpu(swocInfo-\u003eLinuxVer);\n"
}

{
  "EnableConfigs": [
    "USB_STORAGE",
    "USB",
    "SCSI"
  ],
  "FocusSymbols": [
    "sierra_get_swoc_info",
    "sierra_ms_init",
    "truinst_show"
  ],
  "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.

================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.

- REACHABILITY IS THE PRIMARY GATE:
  Fuzzing can only discover bugs in code that can actually execute in standard virtualized
  environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
  If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
  regardless of whether it adds assertions or complex logic.

- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
  Patch authors routinely label changes as "cleanups", "refactorings", or state
  "No functional change intended". Do NOT take these claims at face value.
  Code refactorings that rearrange logic, introduce helper functions, or alter state management
  in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
  If reachable executable code is modified or refactored, it MUST be fuzzed.

- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
  When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
  BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
  Even if the author believes the invariant always holds, fuzzing is essential to verify whether
  an unusual sequence of operations can violate it.

================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:

- Non-kernel and non-executable changes:
  * Modifications to Documentation/, comments, or spelling fixes.
  * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
    that do not affect the compiled kernel image (vmlinux) or kernel modules.
  * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
    that do not alter control flow or data structures.
  * Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
  * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
    ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
  * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
    physical PCI hot-unplug or manual sysfs driver unbinding.
  * Code paths exclusive to architectures other than the target architecture.

================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
  * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
    BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
  * Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
  * Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
  * Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).

================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:

- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
  Do NOT list generic, ubiquitous functions called by almost every program in the corpus
  (including, but not limited to: general memory allocators and deallocators, page fault
  and trap handlers, or core synchronization primitives; this is not an exhaustive list).
  Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
  which severely dilutes fuzzing effort away from the actual changes.

- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
  List functions that specifically implement the logic being added or altered, or direct API entrypoints
  for the subsystem feature under review.

- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
  Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
  distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
  If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
  functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).

================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 8176a97483e2ad011dcc3443b1fcdd8fc17fc6d7
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Sep 16 21:42:05 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c
index 177fa6cd143ab..8755fda42eed2 100644
--- a/drivers/usb/storage/sierra_ms.c
+++ b/drivers/usb/storage/sierra_ms.c
@@ -76,6 +76,12 @@ static int sierra_get_swoc_info(struct usb_device *udev,
 			(void *) swocInfo,		/* void *data        */
 			sizeof(struct swoc_info),	/* __u16 size 	     */
 			USB_CTRL_SET_TIMEOUT);		/* int timeout 	     */
+	/*
+	 * A short IN transfer leaves the tail of swocInfo uninitialized;
+	 * only a full transfer is valid.
+	 */
+	if (result != sizeof(struct swoc_info))
+		return -EIO;
 
 	swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU);
 	swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer);

							input: 2958
							output: 39
							thoughts: 338

**Analyzing a Linux Kernel Patch**

Okay, so I've been asked to review a patch for `drivers/usb/storage/sierra_ms.c`. My initial thought is to get the lay of the land, understand the "why" of this change. It seems to be related to the `sierra_get_swoc_info` function, which deals with retrieving some sort of Software Object Code (SWOC) information from a USB device. The core of the patch is a check on the result of a USB control transfer. Specifically, it's adding an error check after the `usb_control_msg` call.

Looking closer, the comment provides the key insight: a short IN transfer, that is one that returns fewer bytes than expected, leaves parts of the `swocInfo` structure uninitialized. The patch is then adding a check for the result of the transfer, ensuring it's the expected size (`sizeof(struct swoc_info)`). If not, it returns `-EIO`, which signals an Input/Output error. This is a good defensive programming approach, preventing the driver from potentially using uninitialized data, or worse, corrupted data.

I'll want to use `git blame` and cross-reference with any relevant bug reports or mailing list discussions to understand the original problem this patch addresses. I'd like to also look into similar functions in this driver and other USB storage drivers to see if similar error handling patterns are present. It's possible this check should be generalized somehow. Finally, I'll need to think about potential side effects or edge cases, like what happens if this check fails in practice? What would be the implications on the user?

{
  "File": "drivers/usb/storage/sierra_ms.c",
  "FirstLine": 50,
  "LineCount": 70
}

{
  "Contents": "  50:\t\tint result;\n  51:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: %s\", \"DEVICE MODE SWITCH\\n\");\n  52:\t\tresult = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),\n  53:\t\t\t\tSWIMS_USB_REQUEST_SetSwocMode,\t/* __u8 request      */\n  54:\t\t\t\tUSB_TYPE_VENDOR | USB_DIR_OUT,\t/* __u8 request type */\n  55:\t\t\t\teSWocMode,\t\t\t/* __u16 value       */\n  56:\t\t\t\t0x0000,\t\t\t\t/* __u16 index       */\n  57:\t\t\t\tNULL,\t\t\t\t/* void *data        */\n  58:\t\t\t\t0,\t\t\t\t/* __u16 size \t     */\n  59:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/* int timeout       */\n  60:\t\treturn result;\n  61:\t}\n  62:\t\n  63:\t\n  64:\tstatic int sierra_get_swoc_info(struct usb_device *udev,\n  65:\t\t\t\t\tstruct swoc_info *swocInfo)\n  66:\t{\n  67:\t\tint result;\n  68:\t\n  69:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: Attempting to get TRU-Install info\\n\");\n  70:\t\n  71:\t\tresult = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),\n  72:\t\t\t\tSWIMS_USB_REQUEST_GetSwocInfo,\t/* __u8 request      */\n  73:\t\t\t\tUSB_TYPE_VENDOR | USB_DIR_IN,\t/* __u8 request type */\n  74:\t\t\t\t0,\t\t\t\t/* __u16 value       */\n  75:\t\t\t\t0,\t\t\t\t/* __u16 index       */\n  76:\t\t\t\t(void *) swocInfo,\t\t/* void *data        */\n  77:\t\t\t\tsizeof(struct swoc_info),\t/* __u16 size \t     */\n  78:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/* int timeout \t     */\n  79:\t\t/*\n  80:\t\t * A short IN transfer leaves the tail of swocInfo uninitialized;\n  81:\t\t * only a full transfer is valid.\n  82:\t\t */\n  83:\t\tif (result != sizeof(struct swoc_info))\n  84:\t\t\treturn -EIO;\n  85:\t\n  86:\t\tswocInfo-\u003eLinuxSKU = le16_to_cpu(swocInfo-\u003eLinuxSKU);\n  87:\t\tswocInfo-\u003eLinuxVer = le16_to_cpu(swocInfo-\u003eLinuxVer);\n  88:\t\treturn result;\n  89:\t}\n  90:\t\n  91:\tstatic void debug_swoc(const struct device *dev, struct swoc_info *swocInfo)\n  92:\t{\n  93:\t\tdev_dbg(dev, \"SWIMS: SWoC Rev: %02d\\n\", swocInfo-\u003erev);\n  94:\t\tdev_dbg(dev, \"SWIMS: Linux SKU: %04X\\n\", swocInfo-\u003eLinuxSKU);\n  95:\t\tdev_dbg(dev, \"SWIMS: Linux Version: %04X\\n\", swocInfo-\u003eLinuxVer);\n  96:\t}\n  97:\t\n  98:\t\n  99:\tstatic ssize_t truinst_show(struct device *dev, struct device_attribute *attr,\n 100:\t\t\t\tchar *buf)\n 101:\t{\n 102:\t\tstruct swoc_info *swocInfo;\n 103:\t\tstruct usb_interface *intf = to_usb_interface(dev);\n 104:\t\tstruct usb_device *udev = interface_to_usbdev(intf);\n 105:\t\tint result;\n 106:\t\tif (swi_tru_install == TRU_FORCE_MS) {\n 107:\t\t\tresult = sysfs_emit(buf, \"Forced Mass Storage\\n\");\n 108:\t\t} else {\n 109:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);\n 110:\t\t\tif (!swocInfo) {\n 111:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 112:\t\t\t\treturn -ENOMEM;\n 113:\t\t\t}\n 114:\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 115:\t\t\tif (result \u003c 0) {\n 116:\t\t\t\tdev_dbg(dev, \"SWIMS: failed SWoC query\\n\");\n 117:\t\t\t\tkfree(swocInfo);\n 118:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 119:\t\t\t\treturn -EIO;\n"
}

							input: 4904
							output: 38
							thoughts: 37

Okay, let's dive into this code.

**Analyzing the Call Sites of `sierra_get_swoc_info`**

Alright, my immediate thought is to understand the context of `sierra_get_swoc_info`. Where is it being used? To gain that understanding, I'll start by tracing its call sites. My initial plan is to zoom in on the code between lines 1 and 50, then skip ahead to lines 120 through 200. This should provide a reasonable overview of the function's usage, and likely give me some important clues about how it interacts with other components of this system. I suspect a quick scan of these sections will give me the essential pieces of information for further analysis. I am looking for the logical flow of the program and the data it deals with.

{
  "File": "drivers/usb/storage/sierra_ms.c",
  "FirstLine": 1,
  "LineCount": 50
}

{
  "Contents": "   1:\t// SPDX-License-Identifier: GPL-2.0\n   2:\t#include \u003cscsi/scsi.h\u003e\n   3:\t#include \u003cscsi/scsi_host.h\u003e\n   4:\t#include \u003cscsi/scsi_cmnd.h\u003e\n   5:\t#include \u003cscsi/scsi_device.h\u003e\n   6:\t#include \u003clinux/usb.h\u003e\n   7:\t#include \u003clinux/module.h\u003e\n   8:\t#include \u003clinux/slab.h\u003e\n   9:\t\n  10:\t#include \"usb.h\"\n  11:\t#include \"transport.h\"\n  12:\t#include \"protocol.h\"\n  13:\t#include \"scsiglue.h\"\n  14:\t#include \"sierra_ms.h\"\n  15:\t#include \"debug.h\"\n  16:\t\n  17:\t#define SWIMS_USB_REQUEST_SetSwocMode\t0x0B\n  18:\t#define SWIMS_USB_REQUEST_GetSwocInfo\t0x0A\n  19:\t#define SWIMS_USB_INDEX_SetMode\t\t0x0000\n  20:\t#define SWIMS_SET_MODE_Modem\t\t0x0001\n  21:\t\n  22:\t#define TRU_NORMAL \t\t\t0x01\n  23:\t#define TRU_FORCE_MS \t\t\t0x02\n  24:\t#define TRU_FORCE_MODEM \t\t0x03\n  25:\t\n  26:\tstatic unsigned int swi_tru_install = 1;\n  27:\tmodule_param(swi_tru_install, uint, S_IRUGO | S_IWUSR);\n  28:\tMODULE_PARM_DESC(swi_tru_install, \"TRU-Install mode (1=Full Logic (def),\"\n  29:\t\t\t \" 2=Force CD-Rom, 3=Force Modem)\");\n  30:\t\n  31:\tstruct swoc_info {\n  32:\t\t__u8 rev;\n  33:\t\t__u8 reserved[8];\n  34:\t\t__u16 LinuxSKU;\n  35:\t\t__u16 LinuxVer;\n  36:\t\t__u8 reserved2[47];\n  37:\t} __attribute__((__packed__));\n  38:\t\n  39:\tstatic bool containsFullLinuxPackage(struct swoc_info *swocInfo)\n  40:\t{\n  41:\t\tif ((swocInfo-\u003eLinuxSKU \u003e= 0x2100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x2FFF) ||\n  42:\t\t   (swocInfo-\u003eLinuxSKU \u003e= 0x7100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x7FFF))\n  43:\t\t\treturn true;\n  44:\t\telse\n  45:\t\t\treturn false;\n  46:\t}\n  47:\t\n  48:\tstatic int sierra_set_ms_mode(struct usb_device *udev, __u16 eSWocMode)\n  49:\t{\n  50:\t\tint result;\n"
}

							input: 5962
							output: 41
							thoughts: 10

Okay, here's my attempt at summarizing the thought process, tailored for an expert audience, and written in the first person:

**Navigating the Script**

Alright, I've got the initial snippet, but I need to get a handle on the broader context. My immediate instinct is to delve deeper. I need to understand the complete scope of this file before I can draw any concrete conclusions. I'm thinking, let's parse the rest of it. There could be critical dependencies or conflicting ideas further along that will change my initial interpretation. Going forward blindly would be risky at this point. I need to avoid jumping to assumptions and make an informed decision by taking a look at everything.

{
  "File": "drivers/usb/storage/sierra_ms.c",
  "FirstLine": 120,
  "LineCount": 100
}

{
  "Contents": " 120:\t\t\t}\n 121:\t\t\tdebug_swoc(dev, swocInfo);\n 122:\t\t\tresult = sysfs_emit(buf,\n 123:\t\t\t\t\t    \"REV=%02d SKU=%04X VER=%04X\\n\",\n 124:\t\t\t\t\t    swocInfo-\u003erev,\n 125:\t\t\t\t\t    swocInfo-\u003eLinuxSKU,\n 126:\t\t\t\t\t    swocInfo-\u003eLinuxVer);\n 127:\t\t\tkfree(swocInfo);\n 128:\t\t}\n 129:\t\treturn result;\n 130:\t}\n 131:\tstatic DEVICE_ATTR_RO(truinst);\n 132:\t\n 133:\tint sierra_ms_init(struct us_data *us)\n 134:\t{\n 135:\t\tint result, retries;\n 136:\t\tstruct swoc_info *swocInfo;\n 137:\t\tstruct usb_device *udev;\n 138:\t\n 139:\t\tudev = us-\u003epusb_dev;\n 140:\t\n 141:\t\t/* Force Modem mode */\n 142:\t\tif (swi_tru_install == TRU_FORCE_MODEM) {\n 143:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Modem Mode\\n\");\n 144:\t\t\tresult = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem);\n 145:\t\t\tif (result \u003c 0)\n 146:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed to switch to modem mode\\n\");\n 147:\t\t\treturn -EIO;\n 148:\t\t}\n 149:\t\t/* Force Mass Storage mode (keep CD-Rom) */\n 150:\t\telse if (swi_tru_install == TRU_FORCE_MS) {\n 151:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Mass Storage Mode\\n\");\n 152:\t\t\tgoto complete;\n 153:\t\t}\n 154:\t\t/* Normal TRU-Install Logic */\n 155:\t\telse {\n 156:\t\t\tusb_stor_dbg(us, \"SWIMS: Normal SWoC Logic\\n\");\n 157:\t\n 158:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info),\n 159:\t\t\t\t\tGFP_KERNEL);\n 160:\t\t\tif (!swocInfo)\n 161:\t\t\t\treturn -ENOMEM;\n 162:\t\n 163:\t\t\tretries = 3;\n 164:\t\t\tdo {\n 165:\t\t\t\tretries--;\n 166:\t\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 167:\t\t\t\tif (result \u003c 0) {\n 168:\t\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed SWoC query\\n\");\n 169:\t\t\t\t\tschedule_timeout_uninterruptible(2*HZ);\n 170:\t\t\t\t}\n 171:\t\t\t} while (retries \u0026\u0026 result \u003c 0);\n 172:\t\n 173:\t\t\tif (result \u003c 0) {\n 174:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Completely failed SWoC query\\n\");\n 175:\t\t\t\tkfree(swocInfo);\n 176:\t\t\t\treturn -EIO;\n 177:\t\t\t}\n 178:\t\n 179:\t\t\tdebug_swoc(\u0026us-\u003epusb_dev-\u003edev, swocInfo);\n 180:\t\n 181:\t\t\t/*\n 182:\t\t\t * If there is not Linux software on the TRU-Install device\n 183:\t\t\t * then switch to modem mode\n 184:\t\t\t */\n 185:\t\t\tif (!containsFullLinuxPackage(swocInfo)) {\n 186:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Switching to Modem Mode\\n\");\n 187:\t\t\t\tresult = sierra_set_ms_mode(udev,\n 188:\t\t\t\t\tSWIMS_SET_MODE_Modem);\n 189:\t\t\t\tif (result \u003c 0)\n 190:\t\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed to switch modem\\n\");\n 191:\t\t\t\tkfree(swocInfo);\n 192:\t\t\t\treturn -EIO;\n 193:\t\t\t}\n 194:\t\t\tkfree(swocInfo);\n 195:\t\t}\n 196:\tcomplete:\n 197:\t\treturn device_create_file(\u0026us-\u003epusb_intf-\u003edev, \u0026dev_attr_truinst);\n 198:\t}\n 199:\t\n"
}

							input: 7363
							output: 20
							thoughts: 14

Here's my take on those thoughts:

**Tracing the Lineage of `sierra_ms_init`**

Alright, let's get down to brass tacks. I need to understand the control flow here, specifically how the `sierra_ms_init` function gets invoked. My goal is to map out its role within the larger system. Time to crack open the source code and start tracing those calls. I want to see exactly where `sierra_ms_init` is called from. This is the first step in understanding its dependencies and impact.

{
  "Expression": "sierra_ms_init"
}

{
  "Output": "drivers/usb/storage/sierra_ms.c=131=static DEVICE_ATTR_RO(truinst);\ndrivers/usb/storage/sierra_ms.c-132-\ndrivers/usb/storage/sierra_ms.c:133:int sierra_ms_init(struct us_data *us)\ndrivers/usb/storage/sierra_ms.c-134-{\n--\ndrivers/usb/storage/sierra_ms.h-3-#define _SIERRA_MS_H_\ndrivers/usb/storage/sierra_ms.h:4:extern int sierra_ms_init(struct us_data *us);\ndrivers/usb/storage/sierra_ms.h-5-#endif\n--\ndrivers/usb/storage/unusual_devs.h=1772=UNUSUAL_DEV(  0x1199, 0x0fff, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1774-\t\t\"USB MMC Storage\",\ndrivers/usb/storage/unusual_devs.h:1775:\t\tUSB_SC_DEVICE, USB_PR_DEVICE, sierra_ms_init,\ndrivers/usb/storage/unusual_devs.h-1776-\t\t0),\n"
}

							input: 7848
							output: 29
							thoughts: 28

Okay, let's dive into this. Here's how I'd approach that query, as an expert:

**Investigating the Sierra Wireless USB Storage Driver Build Configuration**

Alright, so the user wants to understand how the `sierra_ms` driver in `drivers/usb/storage/` is configured and built within the kernel. My first instinct, and the correct approach, is to go directly to the source. I need to understand the dependencies and build process. I'm going to immediately check the `Makefile` in that directory. I'll be looking for clues – conditional compilation, object file inclusions, any specific flags related to the `sierra_ms` driver. Then, I'll move on to the `Kconfig` file in the same directory. This is where I'll find the configuration options. I'll need to identify the relevant `CONFIG_` options that enable or disable the driver, and understand any dependencies on other kernel features or hardware configurations. I'm hoping to quickly identify which kernel configurations, perhaps `CONFIG_USB_STORAGE` or `CONFIG_SCSI`, are required. I'll also look for any specific `CONFIG_SIERRA_MS` or similar options that directly control this driver's inclusion. By examining these two files in tandem, I should get a complete picture of the build process and the necessary configurations to support Sierra Wireless USB storage devices. This will provide the crucial insights the user is looking for.

{
  "Expression": "sierra_ms",
  "PathPrefix": "drivers/usb/storage"
}

{
  "Output": "drivers/usb/storage/Makefile=16=usb-storage-y := scsiglue.o protocol.o transport.o usb.o\ndrivers/usb/storage/Makefile:17:usb-storage-y += initializers.o sierra_ms.o option_ms.o\ndrivers/usb/storage/Makefile-18-usb-storage-y += usual-tables.o\n--\ndrivers/usb/storage/option_ms.c-6- *\ndrivers/usb/storage/option_ms.c:7: * Inspiration taken from sierra_ms.c by Kevin Lloyd \u003cklloyd@sierrawireless.com\u003e\ndrivers/usb/storage/option_ms.c-8- */\n--\ndrivers/usb/storage/sierra_ms.c-13-#include \"scsiglue.h\"\ndrivers/usb/storage/sierra_ms.c:14:#include \"sierra_ms.h\"\ndrivers/usb/storage/sierra_ms.c-15-#include \"debug.h\"\n--\ndrivers/usb/storage/sierra_ms.c=131=static DEVICE_ATTR_RO(truinst);\ndrivers/usb/storage/sierra_ms.c-132-\ndrivers/usb/storage/sierra_ms.c:133:int sierra_ms_init(struct us_data *us)\ndrivers/usb/storage/sierra_ms.c-134-{\n--\ndrivers/usb/storage/sierra_ms.h-3-#define _SIERRA_MS_H_\ndrivers/usb/storage/sierra_ms.h:4:extern int sierra_ms_init(struct us_data *us);\ndrivers/usb/storage/sierra_ms.h-5-#endif\n--\ndrivers/usb/storage/unusual_devs.h=1772=UNUSUAL_DEV(  0x1199, 0x0fff, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1774-\t\t\"USB MMC Storage\",\ndrivers/usb/storage/unusual_devs.h:1775:\t\tUSB_SC_DEVICE, USB_PR_DEVICE, sierra_ms_init,\ndrivers/usb/storage/unusual_devs.h-1776-\t\t0),\n--\ndrivers/usb/storage/usb.c-56-\ndrivers/usb/storage/usb.c:57:#include \"sierra_ms.h\"\ndrivers/usb/storage/usb.c-58-#include \"option_ms.h\"\n"
}

							input: 8844
							output: 28
							thoughts: 48

**USB Storage Module Inclusion**

Alright, let's break this down. Seeing `usb-storage-y += initializers.o sierra_ms.o option_ms.o` immediately tells me that those object files are being included as part of the `usb-storage` module. That's the obvious conclusion, and it gives us the context we need.

Now, to understand the broader implications of this, my next step is clear. I need to dive into the `Kconfig` file associated with `usb-storage`. That configuration file is where the dependencies, build options, and overall structure of the module are defined. By examining it, I can clarify the inclusion of these specific components. This should give me a solid understanding of how those objects are getting linked in.

{
  "Expression": "usb-storage",
  "PathPrefix": "drivers/usb/storage"
}

{
  "Output": "drivers/usb/storage/Kconfig=8=config USB_STORAGE\n--\ndrivers/usb/storage/Kconfig-23-\t  To compile this driver as a module, choose M here: the\ndrivers/usb/storage/Kconfig:24:\t  module will be called usb-storage.\ndrivers/usb/storage/Kconfig-25-\n--\ndrivers/usb/storage/Makefile=13=obj-$(CONFIG_USB_UAS)\t\t+= uas.o\ndrivers/usb/storage/Makefile:14:obj-$(CONFIG_USB_STORAGE)\t+= usb-storage.o\ndrivers/usb/storage/Makefile-15-\ndrivers/usb/storage/Makefile:16:usb-storage-y := scsiglue.o protocol.o transport.o usb.o\ndrivers/usb/storage/Makefile:17:usb-storage-y += initializers.o sierra_ms.o option_ms.o\ndrivers/usb/storage/Makefile:18:usb-storage-y += usual-tables.o\ndrivers/usb/storage/Makefile:19:usb-storage-$(CONFIG_USB_STORAGE_DEBUG) += debug.o\ndrivers/usb/storage/Makefile-20-\n--\ndrivers/usb/storage/freecom.c-9- * Current development and maintenance by:\ndrivers/usb/storage/freecom.c:10: *   (C) 2000 David Brown \u003cusb-storage@davidb.org\u003e\ndrivers/usb/storage/freecom.c-11- *\n--\ndrivers/usb/storage/freecom.c=29=MODULE_DESCRIPTION(\"Driver for Freecom USB/IDE adaptor\");\ndrivers/usb/storage/freecom.c:30:MODULE_AUTHOR(\"David Brown \u003cusb-storage@davidb.org\u003e\");\ndrivers/usb/storage/freecom.c-31-MODULE_LICENSE(\"GPL\");\n--\ndrivers/usb/storage/protocol.c-8- * Developed with the assistance of:\ndrivers/usb/storage/protocol.c:9: *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/protocol.c-10- *   (c) 2002 Alan Stern (stern@rowland.org)\n--\ndrivers/usb/storage/scsiglue.c-9- * Developed with the assistance of:\ndrivers/usb/storage/scsiglue.c:10: *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/scsiglue.c-11- *   (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)\n--\ndrivers/usb/storage/scsiglue.c=527=static int show_info (struct seq_file *m, struct Scsi_Host *host)\n--\ndrivers/usb/storage/scsiglue.c-532-\t/* print the controller name */\ndrivers/usb/storage/scsiglue.c:533:\tseq_printf(m, \"   Host scsi%d: usb-storage\\n\", host-\u003ehost_no);\ndrivers/usb/storage/scsiglue.c-534-\n--\ndrivers/usb/storage/scsiglue.c=615=static const struct scsi_host_template usb_stor_host_template = {\ndrivers/usb/storage/scsiglue.c-616-\t/* basic userland interface stuff */\ndrivers/usb/storage/scsiglue.c:617:\t.name =\t\t\t\t\"usb-storage\",\ndrivers/usb/storage/scsiglue.c:618:\t.proc_name =\t\t\t\"usb-storage\",\ndrivers/usb/storage/scsiglue.c-619-\t.show_info =\t\t\tshow_info,\n--\ndrivers/usb/storage/transport.c-8- * Developed with the assistance of:\ndrivers/usb/storage/transport.c:9: *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/transport.c-10- *   (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)\n--\ndrivers/usb/storage/transport.c=101=static void usb_stor_blocking_completion(struct urb *urb)\n--\ndrivers/usb/storage/transport.c-110- *\ndrivers/usb/storage/transport.c:111: * All URBs from the usb-storage driver involved in handling a queued scsi\ndrivers/usb/storage/transport.c-112- * command _must_ pass through this function (or something like it) for the\n--\ndrivers/usb/storage/uas-detect.h=55=static int uas_use_uas_driver(struct usb_interface *intf,\n--\ndrivers/usb/storage/uas-detect.h-135-\t\tdev_warn(\u0026udev-\u003edev,\ndrivers/usb/storage/uas-detect.h:136:\t\t\t\"UAS is ignored for this device, using usb-storage instead\\n\");\ndrivers/usb/storage/uas-detect.h-137-\t\treturn 0;\n--\ndrivers/usb/storage/uas.c=1214=static void uas_disconnect(struct usb_interface *intf)\n--\ndrivers/usb/storage/uas.c-1241-/*\ndrivers/usb/storage/uas.c:1242: * Put the device back in usb-storage mode on shutdown, as some BIOS-es\ndrivers/usb/storage/uas.c-1243- * hang on reboot when the device is still in uas mode. Note the reset is\ndrivers/usb/storage/uas.c:1244: * necessary as some devices won't revert to usb-storage mode without it.\ndrivers/usb/storage/uas.c-1245- */\n--\ndrivers/usb/storage/unusual_devs.h=1370=UNUSUAL_DEV(  0x0af0, 0x6971, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1378- * This device (wrongly) has a vendor-specific device descriptor.\ndrivers/usb/storage/unusual_devs.h:1379: * The entry is needed so usb-storage can bind to it's mass-storage\ndrivers/usb/storage/unusual_devs.h-1380- * interface as an interface driver\n--\ndrivers/usb/storage/unusual_devs.h=1382=UNUSUAL_DEV( 0x0af0, 0x7401, 0x0000, 0x0000,\n--\ndrivers/usb/storage/unusual_devs.h-1390- * These devices (wrongly) have a vendor-specific device descriptor.\ndrivers/usb/storage/unusual_devs.h:1391: * These entries are needed so usb-storage can bind to their mass-storage\ndrivers/usb/storage/unusual_devs.h-1392- * interface as an interface driver\n--\ndrivers/usb/storage/unusual_devs.h=1772=UNUSUAL_DEV(  0x1199, 0x0fff, 0x0000, 0x9999,\n--\ndrivers/usb/storage/unusual_devs.h-1779- * Reported by Jaco Kroon \u003cjaco@kroon.co.za\u003e\ndrivers/usb/storage/unusual_devs.h:1780: * The usb-storage module found on the Digitech GNX4 (and supposedly other\ndrivers/usb/storage/unusual_devs.h-1781- * devices) misbehaves and causes a bunch of invalid I/O errors.\n--\ndrivers/usb/storage/unusual_devs.h=2302=UNUSUAL_DEV(  0x1b1c, 0x1ab5, 0x0200, 0x0200,\n--\ndrivers/usb/storage/unusual_devs.h-2310- * These are mini projectors using USB for both power and video data transport\ndrivers/usb/storage/unusual_devs.h:2311: * The usb-storage interface is a virtual windows driver CD, which the gm12u320\ndrivers/usb/storage/unusual_devs.h-2312- * driver automatically converts into framebuffer \u0026 kms dri device nodes.\n--\ndrivers/usb/storage/unusual_onetouch.h-10- * Submitted by: Nick Sillik \u003cn.sillik@temple.edu\u003e\ndrivers/usb/storage/unusual_onetouch.h:11: * Needed for OneTouch extension to usb-storage\ndrivers/usb/storage/unusual_onetouch.h-12- */\n--\ndrivers/usb/storage/unusual_uas.h-6- *\ndrivers/usb/storage/unusual_uas.h:7: * Based on the same file for the usb-storage driver, which is:\ndrivers/usb/storage/unusual_uas.h-8- *   (c) 2000-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)\n--\ndrivers/usb/storage/usb.c-8- * Developed with the assistance of:\ndrivers/usb/storage/usb.c:9: *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)\ndrivers/usb/storage/usb.c-10- *   (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu)\n--\ndrivers/usb/storage/usb.c-63-\ndrivers/usb/storage/usb.c:64:#define DRV_NAME \"usb-storage\"\ndrivers/usb/storage/usb.c-65-\n--\ndrivers/usb/storage/usb.c=670=static int get_device_info(struct us_data *us, const struct usb_device_id *id,\n--\ndrivers/usb/storage/usb.c-733-\t\t\t\t\t\"\u003clinux-usb@vger.kernel.org\u003e and \"\ndrivers/usb/storage/usb.c:734:\t\t\t\t\t\"\u003cusb-storage@lists.one-eyed-alien.net\u003e\\n\",\ndrivers/usb/storage/usb.c-735-\t\t\t\t\tle16_to_cpu(ddesc-\u003eidVendor),\n--\ndrivers/usb/storage/usb.c=855=static int usb_stor_acquire_resources(struct us_data *us)\n--\ndrivers/usb/storage/usb.c-874-\t/* Start up our control thread */\ndrivers/usb/storage/usb.c:875:\tth = kthread_run(usb_stor_control_thread, us, \"usb-storage\");\ndrivers/usb/storage/usb.c-876-\tif (IS_ERR(th)) {\n--\ndrivers/usb/storage/usb.c=1098=int usb_stor_probe2(struct us_data *us)\n--\ndrivers/usb/storage/usb.c-1152-\tusb_autopm_get_interface_no_resume(us-\u003epusb_intf);\ndrivers/usb/storage/usb.c:1153:\tsnprintf(us-\u003escsi_name, sizeof(us-\u003escsi_name), \"usb-storage %s\",\ndrivers/usb/storage/usb.c-1154-\t\t\t\t\tdev_name(\u0026us-\u003epusb_intf-\u003edev));\n--\ndrivers/usb/storage/usb.h=162=extern void fill_inquiry_response(struct us_data *us,\n--\ndrivers/usb/storage/usb.h-171-\ndrivers/usb/storage/usb.h:172:/* General routines provided by the usb-storage standard core */\ndrivers/usb/storage/usb.h-173-#ifdef CONFIG_PM\n--\ndrivers/usb/storage/usual-tables.c-3- * Driver for USB Mass Storage devices\ndrivers/usb/storage/usual-tables.c:4: * Usual Tables File for usb-storage and libusual\ndrivers/usb/storage/usual-tables.c-5- *\n"
}

							input: 12096
							output: 42
							thoughts: 159

**Syzkaller's USB Fuzzing Approach**

Okay, let's dive into how syzkaller handles testing USB devices. My immediate thought is, "Ah, right, it leverages the USB raw gadget and `syz_usb_connect` system call for emulation. Clever." Now, I'm curious if it's capable of fuzzing something specific, like usb-storage devices. I seem to recall it does, and yep, syzkaller does a pretty thorough job by regularly spinning up emulated USB devices with all sorts of vendor and product ID combinations, like the ubiquitous 0x1199 and 0x0fff, to target `usb-storage` and also those `unusual_devs`.

Thinking further, I should verify that syzkaller also can read some sysfs attributes of these devices, like `truinst` (it probably does, but let's confirm). Hold on a second, what's this `unusual_devs.h` file and why is it popping into my head? Line 1772 in particular... I'm going to have to go and check out lines 1765 through 1785 of that file, `drivers/usb/storage/unusual_devs.h`, to refresh my memory and understand the context.

{
  "File": "drivers/usb/storage/unusual_devs.h",
  "FirstLine": 1765,
  "LineCount": 25
}

{
  "Contents": "1765:\t\n1766:\t/*\n1767:\t * Reported by Kevin Lloyd \u003clinux@sierrawireless.com\u003e\n1768:\t * Entry is needed for the initializer function override,\n1769:\t * which instructs the device to load as a modem\n1770:\t * device.\n1771:\t */\n1772:\tUNUSUAL_DEV(  0x1199, 0x0fff, 0x0000, 0x9999,\n1773:\t\t\t\"Sierra Wireless\",\n1774:\t\t\t\"USB MMC Storage\",\n1775:\t\t\tUSB_SC_DEVICE, USB_PR_DEVICE, sierra_ms_init,\n1776:\t\t\t0),\n1777:\t\n1778:\t/*\n1779:\t * Reported by Jaco Kroon \u003cjaco@kroon.co.za\u003e\n1780:\t * The usb-storage module found on the Digitech GNX4 (and supposedly other\n1781:\t * devices) misbehaves and causes a bunch of invalid I/O errors.\n1782:\t */\n1783:\tUNUSUAL_DEV(  0x1210, 0x0003, 0x0100, 0x0100,\n1784:\t\t\t\"Digitech HMG\",\n1785:\t\t\t\"DigiTech Mass Storage\",\n1786:\t\t\tUSB_SC_DEVICE, USB_PR_DEVICE, NULL,\n1787:\t\t\tUS_FL_IGNORE_RESIDUE ),\n1788:\t\n1789:\t/*\n"
}

							input: 13003
							output: 27
							thoughts: 75

**Analyzing USB Device Initialization**

Okay, so a USB device with the specific vendor and product IDs, `0x1199` and `0x0fff` respectively, has been plugged in.  This happened through syzkaller's USB raw gadget emulation, which is interesting in itself. The important thing now is that the `usb-storage` driver has correctly matched this device.  My first instinct is to immediately jump to the `usb-storage` probe function and trace the initialization process. Let's see what happens from the call to `sierra_ms_init`. I need to understand this whole chain of events, from device detection all the way through to actual operation, so I'll check `usb.c` to understand the bigger picture. Time to dive into the code.

{
  "Expression": "initFunction",
  "PathPrefix": "drivers/usb/storage"
}

{
  "Output": "drivers/usb/storage/alauda.c=123=static int init_alauda(struct us_data *us);\n--\ndrivers/usb/storage/alauda.c-130-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/alauda.c:131:\t\t    initFunction, flags) \\\ndrivers/usb/storage/alauda.c-132-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/alauda.c=139=MODULE_DEVICE_TABLE(usb, alauda_usb_ids);\n--\ndrivers/usb/storage/alauda.c-153-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/alauda.c:154:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/alauda.c-155-}\n--\ndrivers/usb/storage/cypress_atacb.c=25=MODULE_IMPORT_NS(\"USB_STORAGE\");\n--\ndrivers/usb/storage/cypress_atacb.c-31-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/cypress_atacb.c:32:\t\t    initFunction, flags) \\\ndrivers/usb/storage/cypress_atacb.c-33-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/cypress_atacb.c=40=MODULE_DEVICE_TABLE(usb, cypress_usb_ids);\n--\ndrivers/usb/storage/cypress_atacb.c-54-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/cypress_atacb.c:55:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/cypress_atacb.c-56-}\n--\ndrivers/usb/storage/datafab.c=70=static int datafab_determine_lun(struct us_data *us,\n--\ndrivers/usb/storage/datafab.c-78-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/datafab.c:79:\t\t    initFunction, flags) \\\ndrivers/usb/storage/datafab.c-80-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/datafab.c=87=MODULE_DEVICE_TABLE(usb, datafab_usb_ids);\n--\ndrivers/usb/storage/datafab.c-101-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/datafab.c:102:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/datafab.c-103-}\n--\ndrivers/usb/storage/ene_ub6250.c=35=MODULE_FIRMWARE(MS_RW_FIRMWARE);\n--\ndrivers/usb/storage/ene_ub6250.c-41-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/ene_ub6250.c:42:\t\t    initFunction, flags) \\\ndrivers/usb/storage/ene_ub6250.c-43-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/ene_ub6250.c=50=MODULE_DEVICE_TABLE(usb, ene_ub6250_usb_ids);\n--\ndrivers/usb/storage/ene_ub6250.c-64-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/ene_ub6250.c:65:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/ene_ub6250.c-66-}\n--\ndrivers/usb/storage/freecom.c=110=static int init_freecom(struct us_data *us);\n--\ndrivers/usb/storage/freecom.c-117-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/freecom.c:118:\t\t    initFunction, flags) \\\ndrivers/usb/storage/freecom.c-119-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/freecom.c=126=MODULE_DEVICE_TABLE(usb, freecom_usb_ids);\n--\ndrivers/usb/storage/freecom.c-140-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/freecom.c:141:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/freecom.c-142-}\n--\ndrivers/usb/storage/isd200.c=58=static int isd200_Initialization(struct us_data *us);\n--\ndrivers/usb/storage/isd200.c-65-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/isd200.c:66:\t\t    initFunction, flags) \\\ndrivers/usb/storage/isd200.c-67-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/isd200.c=74=MODULE_DEVICE_TABLE(usb, isd200_usb_ids);\n--\ndrivers/usb/storage/isd200.c-88-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/isd200.c:89:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/isd200.c-90-}\n--\ndrivers/usb/storage/jumpshot.c=54=MODULE_IMPORT_NS(\"USB_STORAGE\");\n--\ndrivers/usb/storage/jumpshot.c-60-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/jumpshot.c:61:\t\t    initFunction, flags) \\\ndrivers/usb/storage/jumpshot.c-62-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/jumpshot.c=69=MODULE_DEVICE_TABLE(usb, jumpshot_usb_ids);\n--\ndrivers/usb/storage/jumpshot.c-83-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/jumpshot.c:84:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/jumpshot.c-85-}\n--\ndrivers/usb/storage/karma.c=42=static int rio_karma_init(struct us_data *us);\n--\ndrivers/usb/storage/karma.c-49-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/karma.c:50:\t\t    initFunction, flags) \\\ndrivers/usb/storage/karma.c-51-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/karma.c=58=MODULE_DEVICE_TABLE(usb, karma_usb_ids);\n--\ndrivers/usb/storage/karma.c-72-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/karma.c:73:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/karma.c-74-}\n--\ndrivers/usb/storage/onetouch.c=36=struct usb_onetouch {\n--\ndrivers/usb/storage/onetouch.c-53-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/onetouch.c:54:\t\t    initFunction, flags) \\\ndrivers/usb/storage/onetouch.c-55-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/onetouch.c=62=MODULE_DEVICE_TABLE(usb, onetouch_usb_ids);\n--\ndrivers/usb/storage/onetouch.c-76-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/onetouch.c:77:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/onetouch.c-78-}\n--\ndrivers/usb/storage/realtek_cr.c=158=static int init_realtek_cr(struct us_data *us);\n--\ndrivers/usb/storage/realtek_cr.c-164-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/realtek_cr.c:165:\t\t    initFunction, flags) \\\ndrivers/usb/storage/realtek_cr.c-166-{\\\n--\ndrivers/usb/storage/realtek_cr.c=176=MODULE_DEVICE_TABLE(usb, realtek_cr_ids);\n--\ndrivers/usb/storage/realtek_cr.c-190-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/realtek_cr.c:191:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/realtek_cr.c-192-}\n--\ndrivers/usb/storage/sddr09.c=54=static int usb_stor_sddr09_init(struct us_data *us);\n--\ndrivers/usb/storage/sddr09.c-61-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/sddr09.c:62:\t\t    initFunction, flags) \\\ndrivers/usb/storage/sddr09.c-63-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/sddr09.c=70=MODULE_DEVICE_TABLE(usb, sddr09_usb_ids);\n--\ndrivers/usb/storage/sddr09.c-84-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/sddr09.c:85:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/sddr09.c-86-}\n--\ndrivers/usb/storage/sddr55.c=32=MODULE_IMPORT_NS(\"USB_STORAGE\");\n--\ndrivers/usb/storage/sddr55.c-38-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/sddr55.c:39:\t\t    initFunction, flags) \\\ndrivers/usb/storage/sddr55.c-40-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/sddr55.c=47=MODULE_DEVICE_TABLE(usb, sddr55_usb_ids);\n--\ndrivers/usb/storage/sddr55.c-61-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/sddr55.c:62:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/sddr55.c-63-}\n--\ndrivers/usb/storage/shuttle_usbat.c=154=static int init_usbat_flash(struct us_data *us);\n--\ndrivers/usb/storage/shuttle_usbat.c-161-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/shuttle_usbat.c:162:\t\t    initFunction, flags) \\\ndrivers/usb/storage/shuttle_usbat.c-163-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/shuttle_usbat.c=170=MODULE_DEVICE_TABLE(usb, usbat_usb_ids);\n--\ndrivers/usb/storage/shuttle_usbat.c-184-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/shuttle_usbat.c:185:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/shuttle_usbat.c-186-}\n--\ndrivers/usb/storage/uas.c=913=static const struct scsi_host_template uas_host_template = {\n--\ndrivers/usb/storage/uas.c-935-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/uas.c:936:\t\t    initFunction, flags) \\\ndrivers/usb/storage/uas.c-937-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/usb.c=170=MODULE_PARM_DESC(quirks, \"supplemental list of device IDs and their quirks\");\n--\ndrivers/usb/storage/usb.c-195-\t.useTransport = use_transport,\t\\\ndrivers/usb/storage/usb.c:196:\t.initFunction = init_function,\t\\\ndrivers/usb/storage/usb.c-197-}\n--\ndrivers/usb/storage/usb.c=855=static int usb_stor_acquire_resources(struct us_data *us)\n--\ndrivers/usb/storage/usb.c-867-\t */\ndrivers/usb/storage/usb.c:868:\tif (us-\u003eunusual_dev-\u003einitFunction) {\ndrivers/usb/storage/usb.c:869:\t\tp = us-\u003eunusual_dev-\u003einitFunction(us);\ndrivers/usb/storage/usb.c-870-\t\tif (p)\n--\ndrivers/usb/storage/usb.h=45=struct us_unusual_dev {\n--\ndrivers/usb/storage/usb.h-49-\t__u8  useTransport;\ndrivers/usb/storage/usb.h:50:\tint (*initFunction)(struct us_data *);\ndrivers/usb/storage/usb.h-51-};\n--\ndrivers/usb/storage/usual-tables.c-19-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/usual-tables.c:20:\t\t    initFunction, flags) \\\ndrivers/usb/storage/usual-tables.c-21-{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \\\n--\ndrivers/usb/storage/usual-tables.c=42=struct ignore_entry {\n--\ndrivers/usb/storage/usual-tables.c-47-\t\t    vendorName, productName, useProtocol, useTransport, \\\ndrivers/usb/storage/usual-tables.c:48:\t\t    initFunction, flags) \\\ndrivers/usb/storage/usual-tables.c-49-{\t\t\t\t\t\\\n"
}

							input: 17058
							output: 34
							thoughts: 1259

**Analysis of USB Control Message Handling in sierra_ms Driver**

Okay, let's break this down. I'm looking at `usb.c:869` and see that `sierra_ms_init` is called as the initialization function for the Sierra Wireless device with vendor ID 0x1199 and product ID 0x0fff. This function calls `sierra_get_swoc_info`.  Inside `sierra_get_swoc_info`, we have a `usb_control_msg` call using `SWIMS_USB_REQUEST_GetSwocInfo` to retrieve some information, `swocInfo`.  Previously, there was no check on the result of this control message!

The current patch *now* checks the size of the returned data. Specifically, `if (result != sizeof(struct swoc_info))` returns `-EIO`.  Before this, a short transfer or an error wouldn't necessarily be handled correctly, and `swocInfo->LinuxSKU` and `swocInfo->LinuxVer` might have been read from uninitialized memory if `usb_control_msg` returned a value less than the expected size but greater than zero.  This is a critical vulnerability. KMSAN would likely detect the use of uninitialized values.  The new check ensures that only a full, valid transfer is accepted, essentially treating any short read as an error.

The important point here is that previously if `result` was negative, the function returned `result`, which was negative, and `sierra_ms_init` correctly checked for this case. However, the use of `result != sizeof(struct swoc_info)` now also correctly handles the scenario when `result` is negative, because in C, the negative `int` `result` is promoted to `unsigned long` (or `size_t`) and therefore returns `-EIO` because it's *not* equal to `sizeof(struct swoc_info)`.

So, the new code is *much* better.

Next, I need to consider the exploitability of this.  Can we trigger this condition easily? Definitely!  Syzkaller can fuzz USB devices via emulation. It explicitly targets drivers accessible through virtual buses, including USB gadgets.  It should be easy to create test cases.  The mention of "syz_usb_connect," USB Raw Gadget, and dummy_hcd confirms that `usb-storage` and `sierra_ms` are reachable via USB emulation in syzkaller. Now, let's verify which configs are needed for `sierra_ms.c` and figure out how to best trigger this. I'll need to check `drivers/usb/storage/Makefile` and `drivers/usb/storage/Kconfig`.

{
  "File": "drivers/usb/storage/Kconfig",
  "FirstLine": 1,
  "LineCount": 40
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t#\n   3:\t# USB Storage driver configuration\n   4:\t#\n   5:\t\n   6:\tcomment \"NOTE: USB_STORAGE depends on SCSI but BLK_DEV_SD may also be needed; see USB_STORAGE Help for more info\"\n   7:\t\n   8:\tconfig USB_STORAGE\n   9:\t\ttristate \"USB Mass Storage support\"\n  10:\t\tdepends on SCSI\n  11:\t\thelp\n  12:\t\t  Say Y here if you want to connect USB mass storage devices to your\n  13:\t\t  computer's USB port. This is the driver you need for USB\n  14:\t\t  floppy drives, USB hard disks, USB tape drives, USB CD-ROMs,\n  15:\t\t  USB flash devices, and memory sticks, along with\n  16:\t\t  similar devices. This driver may also be used for some cameras\n  17:\t\t  and card readers.\n  18:\t\n  19:\t\t  This option depends on 'SCSI' support being enabled, but you\n  20:\t\t  probably also need 'SCSI device support: SCSI disk support'\n  21:\t\t  (BLK_DEV_SD) for most USB storage devices.\n  22:\t\n  23:\t\t  To compile this driver as a module, choose M here: the\n  24:\t\t  module will be called usb-storage.\n  25:\t\n  26:\tif USB_STORAGE\n  27:\t\n  28:\tconfig USB_STORAGE_DEBUG\n  29:\t\tbool \"USB Mass Storage verbose debug\"\n  30:\t\thelp\n  31:\t\t  Say Y here in order to have the USB Mass Storage code generate\n  32:\t\t  verbose debugging messages.\n  33:\t\n  34:\tconfig USB_STORAGE_REALTEK\n  35:\t\ttristate \"Realtek Card Reader support\"\n  36:\t\thelp\n  37:\t\t  Say Y here to include additional code to support the power-saving function\n  38:\t\t  for Realtek RTS51xx USB card readers.\n  39:\t\n  40:\t\t  If this driver is compiled as a module, it will be named ums-realtek.\n"
}

							input: 19499
							output: 24
							thoughts: 27

Here's my thinking process:

**Investigating USB Storage Driver Enablement**

Okay, so I need to figure out what's enabling the USB storage driver, specifically `drivers/usb/storage/`. My initial thought is to trace the configuration options. A good starting point is always the `Makefile` in the directory I'm interested in (`drivers/usb/`). This `Makefile` should reveal which Kconfig options, if any, control the compilation of the USB storage module. If it doesn't give me the full picture, I'll need to look at parent directories' `Kconfig` files and work my way up the kernel's source tree. I'm expecting this is a fairly standard configuration dependency, but I need to confirm and identify the specific option(s) responsible for enabling this particular module.

{
  "Expression": "storage",
  "PathPrefix": "drivers/usb"
}

{
  "Output": "\nFull output is too long, showing 500 out of 816 lines.\nUse more precise expression if possible.\n\ndrivers/usb/Kconfig=114=source \"drivers/usb/class/Kconfig\"\ndrivers/usb/Kconfig-115-\ndrivers/usb/Kconfig:116:source \"drivers/usb/storage/Kconfig\"\ndrivers/usb/Kconfig-117-\n--\ndrivers/usb/Makefile=45=obj-$(CONFIG_USB_TMC)\t\t+= class/\ndrivers/usb/Makefile-46-\ndrivers/usb/Makefile:47:obj-$(CONFIG_USB_STORAGE)\t+= storage/\ndrivers/usb/Makefile:48:obj-$(CONFIG_USB)\t\t+= storage/\ndrivers/usb/Makefile-49-\n--\ndrivers/usb/core/hub.c=3738=static int wait_for_connected(struct usb_device *udev,\n--\ndrivers/usb/core/hub.c-3777- * power sessions below it will be broken.  This is especially troublesome\ndrivers/usb/core/hub.c:3778: * for mass-storage devices containing mounted filesystems, since the\ndrivers/usb/core/hub.c-3779- * device will appear to have disconnected and all the memory mappings\n--\ndrivers/usb/core/hub.c=4106=static int usb_req_set_sel(struct usb_device *udev)\n--\ndrivers/usb/core/hub.c-4141-\t * usb_enable_lpm() can be called as part of a failed device reset,\ndrivers/usb/core/hub.c:4142:\t * which may be initiated by an error path of a mass storage driver.\ndrivers/usb/core/hub.c-4143-\t * Therefore, use GFP_NOIO.\n--\ndrivers/usb/core/hub.c=6349=int usb_reset_device(struct usb_device *udev)\n--\ndrivers/usb/core/hub.c-6378-\t * context to avoid possible deadlock if usb mass\ndrivers/usb/core/hub.c:6379:\t * storage interface or usbnet interface(iSCSI case)\ndrivers/usb/core/hub.c-6380-\t * is included in current configuration. The easist\n--\ndrivers/usb/core/message.c=1207=int usb_clear_halt(struct usb_device *dev, int pipe)\n--\ndrivers/usb/core/message.c-1232-\t * NOTE:  make sure the logic here doesn't diverge much from\ndrivers/usb/core/message.c:1233:\t * the copy in usb-storage, for as long as we need two copies.\ndrivers/usb/core/message.c-1234-\t */\n--\ndrivers/usb/core/urb.c=229=EXPORT_SYMBOL_GPL(usb_urb_ep_type_check);\n--\ndrivers/usb/core/urb.c-348- *\ndrivers/usb/core/urb.c:349: * GFP_NOIO is used in the block io path and error handling of storage\ndrivers/usb/core/urb.c-350- * devices.\n--\ndrivers/usb/core/urb.c-361- *  (4) after you have done a down() you can use GFP_KERNEL, unless (b) or (c)\ndrivers/usb/core/urb.c:362: *      apply or your are in a storage driver's block io path;\ndrivers/usb/core/urb.c-363- *  (5) USB probe and disconnect can use GFP_KERNEL unless (b) or (c) apply; and\ndrivers/usb/core/urb.c:364: *  (6) changing firmware on a running storage or net device uses\ndrivers/usb/core/urb.c-365- *      GFP_NOIO, unless b) or c) apply\n--\ndrivers/usb/core/usb.c=862=EXPORT_SYMBOL_GPL(usb_intf_get_dma_device);\n--\ndrivers/usb/core/usb.c-888- * lock, the routine polls repeatedly.  This is to prevent deadlock with\ndrivers/usb/core/usb.c:889: * disconnect; in some drivers (such as usb-storage) the disconnect()\ndrivers/usb/core/usb.c-890- * or suspend() method will block waiting for a device reset to complete.\n--\ndrivers/usb/dwc2/hcd.c=4991=static struct hc_driver dwc2_hc_driver = {\n--\ndrivers/usb/dwc2/hcd.c-5018-/*\ndrivers/usb/dwc2/hcd.c:5019: * Frees secondary storage associated with the dwc2_hsotg structure contained\ndrivers/usb/dwc2/hcd.c-5020- * in the struct usb_hcd field\n--\ndrivers/usb/dwc3/gadget.c=4102=static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)\n--\ndrivers/usb/dwc3/gadget.c-4111-\t * However, for functions which defer ep disable, such as mass\ndrivers/usb/dwc3/gadget.c:4112:\t * storage, we will need to rely on the call to stop active\ndrivers/usb/dwc3/gadget.c-4113-\t * transfers here, and avoid allowing of request queuing.\n--\ndrivers/usb/fotg210/fotg210-hcd.c=4889=static int hcd_fotg210_init(struct usb_hcd *hcd)\n--\ndrivers/usb/fotg210/fotg210-hcd.c-4970-\t\t *\ndrivers/usb/fotg210/fotg210-hcd.c:4971:\t\t * With fast usb storage devices and NForce2, \"park\" seems to\ndrivers/usb/fotg210/fotg210-hcd.c-4972-\t\t * make problems:  throughput reduction (!), data errors...\n--\ndrivers/usb/gadget/Kconfig=116=config USB_GADGET_STORAGE_NUM_BUFFERS\ndrivers/usb/gadget/Kconfig:117:\tint \"Number of storage pipeline buffers\"\ndrivers/usb/gadget/Kconfig-118-\trange 2 256\n--\ndrivers/usb/gadget/Kconfig=345=config USB_CONFIGFS_MASS_STORAGE\ndrivers/usb/gadget/Kconfig:346:\tbool \"Mass storage\"\ndrivers/usb/gadget/Kconfig-347-\tdepends on USB_CONFIGFS\n--\ndrivers/usb/gadget/Kconfig-351-\t  The Mass Storage Gadget acts as a USB Mass Storage disk drive.\ndrivers/usb/gadget/Kconfig:352:\t  As its storage repository it can use a regular file or a block\ndrivers/usb/gadget/Kconfig-353-\t  device (in much the same way as the \"loop\" device driver),\n--\ndrivers/usb/gadget/Kconfig=369=config USB_CONFIGFS_F_FS\n--\ndrivers/usb/gadget/Kconfig-378-\t  implemented in kernel space (for instance Ethernet, serial or\ndrivers/usb/gadget/Kconfig:379:\t  mass storage) and other are implemented in user space.\ndrivers/usb/gadget/Kconfig-380-\n--\ndrivers/usb/gadget/function/Makefile=31=obj-$(CONFIG_USB_F_RNDIS)\t+= usb_f_rndis.o\ndrivers/usb/gadget/function/Makefile:32:usb_f_mass_storage-y\t\t:= f_mass_storage.o storage_common.o\ndrivers/usb/gadget/function/Makefile:33:obj-$(CONFIG_USB_F_MASS_STORAGE)+= usb_f_mass_storage.o\ndrivers/usb/gadget/function/Makefile-34-usb_f_fs-y\t\t\t:= f_fs.o\n--\ndrivers/usb/gadget/function/f_fs.c=234=struct ffs_buffer {\n--\ndrivers/usb/gadget/function/f_fs.c-236-\tchar *data;\ndrivers/usb/gadget/function/f_fs.c:237:\tchar storage[] __counted_by(length);\ndrivers/usb/gadget/function/f_fs.c-238-};\n--\ndrivers/usb/gadget/function/f_fs.c=941=static ssize_t __ffs_epfile_read_data(struct ffs_epfile *epfile,\n--\ndrivers/usb/gadget/function/f_fs.c-958-\tdata_len -= ret;\ndrivers/usb/gadget/function/f_fs.c:959:\tbuf = kmalloc(struct_size(buf, storage, data_len), GFP_KERNEL);\ndrivers/usb/gadget/function/f_fs.c-960-\tif (!buf)\n--\ndrivers/usb/gadget/function/f_fs.c-962-\tbuf-\u003elength = data_len;\ndrivers/usb/gadget/function/f_fs.c:963:\tbuf-\u003edata = buf-\u003estorage;\ndrivers/usb/gadget/function/f_fs.c:964:\tmemcpy(buf-\u003estorage, data + ret, flex_array_size(buf, storage, data_len));\ndrivers/usb/gadget/function/f_fs.c-965-\n--\ndrivers/usb/gadget/function/f_mass_storage.c-2-/*\ndrivers/usb/gadget/function/f_mass_storage.c:3: * f_mass_storage.c -- Mass Storage USB Composite Function\ndrivers/usb/gadget/function/f_mass_storage.c-4- *\n--\ndrivers/usb/gadget/function/f_mass_storage.c-19- * parameters and sysfs interface read the\ndrivers/usb/gadget/function/f_mass_storage.c:20: * \u003cDocumentation/usb/mass-storage.rst\u003e file.\ndrivers/usb/gadget/function/f_mass_storage.c-21- */\n--\ndrivers/usb/gadget/function/f_mass_storage.c=207=static const char fsg_string_interface[] = \"Mass Storage\";\ndrivers/usb/gadget/function/f_mass_storage.c-208-\ndrivers/usb/gadget/function/f_mass_storage.c:209:#include \"storage_common.h\"\ndrivers/usb/gadget/function/f_mass_storage.c:210:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/function/f_mass_storage.c-211-\n--\ndrivers/usb/gadget/function/f_mass_storage.c=234=struct fsg_common {\n--\ndrivers/usb/gadget/function/f_mass_storage.c-275-\tunsigned int\t\tcan_stall:1;\ndrivers/usb/gadget/function/f_mass_storage.c:276:\tunsigned int\t\tfree_storage_on_release:1;\ndrivers/usb/gadget/function/f_mass_storage.c-277-\tunsigned int\t\tphase_error:1;\n--\ndrivers/usb/gadget/function/f_mass_storage.c=2699=static struct fsg_common *fsg_common_setup(struct fsg_common *common)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-2704-\t\t\treturn ERR_PTR(-ENOMEM);\ndrivers/usb/gadget/function/f_mass_storage.c:2705:\t\tcommon-\u003efree_storage_on_release = 1;\ndrivers/usb/gadget/function/f_mass_storage.c-2706-\t} else {\ndrivers/usb/gadget/function/f_mass_storage.c:2707:\t\tcommon-\u003efree_storage_on_release = 0;\ndrivers/usb/gadget/function/f_mass_storage.c-2708-\t}\n--\ndrivers/usb/gadget/function/f_mass_storage.c=2995=static void fsg_common_release(struct fsg_common *common)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-3015-\t_fsg_common_free_buffers(common-\u003ebuffhds, common-\u003efsg_num_buffers);\ndrivers/usb/gadget/function/f_mass_storage.c:3016:\tif (common-\u003efree_storage_on_release)\ndrivers/usb/gadget/function/f_mass_storage.c-3017-\t\tkfree(common);\n--\ndrivers/usb/gadget/function/f_mass_storage.c=3023=static int fsg_bind(struct usb_configuration *c, struct usb_function *f)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-3052-\t\tcommon-\u003ethread_task =\ndrivers/usb/gadget/function/f_mass_storage.c:3053:\t\t\tkthread_run(fsg_main_thread, common, \"file-storage\");\ndrivers/usb/gadget/function/f_mass_storage.c-3054-\t\tif (IS_ERR(common-\u003ethread_task)) {\n--\ndrivers/usb/gadget/function/f_mass_storage.c=3551=static struct usb_function *fsg_alloc(struct usb_function_instance *fi)\n--\ndrivers/usb/gadget/function/f_mass_storage.c-3577-\ndrivers/usb/gadget/function/f_mass_storage.c:3578:DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc);\ndrivers/usb/gadget/function/f_mass_storage.c-3579-MODULE_DESCRIPTION(\"Mass Storage USB Composite Function\");\n--\ndrivers/usb/gadget/function/f_mass_storage.h-5-#include \u003clinux/usb/composite.h\u003e\ndrivers/usb/gadget/function/f_mass_storage.h:6:#include \"storage_common.h\"\ndrivers/usb/gadget/function/f_mass_storage.h-7-\n--\ndrivers/usb/gadget/function/f_tcm.c-18-#include \u003clinux/usb/gadget.h\u003e\ndrivers/usb/gadget/function/f_tcm.c:19:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/function/f_tcm.c-20-#include \u003cscsi/scsi_tcq.h\u003e\n--\ndrivers/usb/gadget/function/storage_common.c-2-/*\ndrivers/usb/gadget/function/storage_common.c:3: * storage_common.c -- Common definitions for mass storage functionality\ndrivers/usb/gadget/function/storage_common.c-4- *\n--\ndrivers/usb/gadget/function/storage_common.c-28-\ndrivers/usb/gadget/function/storage_common.c:29:#include \"storage_common.h\"\ndrivers/usb/gadget/function/storage_common.c-30-\n--\ndrivers/usb/gadget/function/storage_common.c=538=EXPORT_SYMBOL_GPL(fsg_store_forced_eject);\ndrivers/usb/gadget/function/storage_common.c-539-\ndrivers/usb/gadget/function/storage_common.c:540:MODULE_DESCRIPTION(\"Common definitions for mass storage functionality\");\ndrivers/usb/gadget/function/storage_common.c-541-MODULE_LICENSE(\"GPL\");\n--\ndrivers/usb/gadget/function/storage_common.h-5-#include \u003clinux/device.h\u003e\ndrivers/usb/gadget/function/storage_common.h:6:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/function/storage_common.h-7-#include \u003cscsi/scsi.h\u003e\n--\ndrivers/usb/gadget/function/storage_common.h=125=static inline bool fsg_lun_is_open(struct fsg_lun *curlun)\n--\ndrivers/usb/gadget/function/storage_common.h-132-\ndrivers/usb/gadget/function/storage_common.h:133:/* Maximal number of LUNs supported in mass storage function */\ndrivers/usb/gadget/function/storage_common.h-134-#define FSG_MAX_LUNS\t(US_BULK_MAX_LUN_LIMIT + 1)\n--\ndrivers/usb/gadget/function/tcm.h-9-#include \u003clinux/usb/uas.h\u003e\ndrivers/usb/gadget/function/tcm.h:10:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/function/tcm.h-11-#include \u003ctarget/target_core_base.h\u003e\n--\ndrivers/usb/gadget/legacy/Kconfig=218=config USB_FUNCTIONFS\n--\ndrivers/usb/gadget/legacy/Kconfig-228-\t  implemented in kernel space (for instance Ethernet, serial or\ndrivers/usb/gadget/legacy/Kconfig:229:\t  mass storage) and other are implemented in user space.\ndrivers/usb/gadget/legacy/Kconfig-230-\n--\ndrivers/usb/gadget/legacy/Kconfig=262=config USB_MASS_STORAGE\n--\ndrivers/usb/gadget/legacy/Kconfig-268-\t  The Mass Storage Gadget acts as a USB Mass Storage disk drive.\ndrivers/usb/gadget/legacy/Kconfig:269:\t  As its storage repository it can use a regular file or a block\ndrivers/usb/gadget/legacy/Kconfig-270-\t  device (in much the same way as the \"loop\" device driver),\n--\ndrivers/usb/gadget/legacy/Kconfig-273-\t  This driver is a replacement for now removed File-backed\ndrivers/usb/gadget/legacy/Kconfig:274:\t  Storage Gadget (g_file_storage).\ndrivers/usb/gadget/legacy/Kconfig-275-\ndrivers/usb/gadget/legacy/Kconfig-276-\t  Say \"y\" to link the driver statically, or \"m\" to build\ndrivers/usb/gadget/legacy/Kconfig:277:\t  a dynamically linked module called \"g_mass_storage\".\ndrivers/usb/gadget/legacy/Kconfig-278-\n--\ndrivers/usb/gadget/legacy/Kconfig=389=config USB_G_ACM_MS\ndrivers/usb/gadget/legacy/Kconfig:390:\ttristate \"CDC Composite Device (ACM and mass storage)\"\ndrivers/usb/gadget/legacy/Kconfig-391-\tdepends on BLOCK\n--\ndrivers/usb/gadget/legacy/Kconfig-397-\t  This driver provides two functions in one configuration:\ndrivers/usb/gadget/legacy/Kconfig:398:\t  a mass storage, and a CDC ACM (serial port) link.\ndrivers/usb/gadget/legacy/Kconfig-399-\n--\ndrivers/usb/gadget/legacy/Kconfig=403=config USB_G_MULTI\n--\ndrivers/usb/gadget/legacy/Kconfig-413-\t  The Multifunction Composite Gadget provides Ethernet (RNDIS\ndrivers/usb/gadget/legacy/Kconfig:414:\t  and/or CDC Ethernet), mass storage and ACM serial link\ndrivers/usb/gadget/legacy/Kconfig-415-\t  interfaces.\n--\ndrivers/usb/gadget/legacy/Makefile=15=gadgetfs-y\t\t\t:= inode.o\ndrivers/usb/gadget/legacy/Makefile:16:g_mass_storage-y\t\t:= mass_storage.o\ndrivers/usb/gadget/legacy/Makefile-17-g_printer-y\t\t\t:= printer.o\n--\ndrivers/usb/gadget/legacy/Makefile=32=obj-$(CONFIG_USB_FUNCTIONFS)\t+= g_ffs.o\ndrivers/usb/gadget/legacy/Makefile:33:obj-$(CONFIG_USB_MASS_STORAGE)\t+= g_mass_storage.o\ndrivers/usb/gadget/legacy/Makefile-34-obj-$(CONFIG_USB_G_SERIAL)\t+= g_serial.o\n--\ndrivers/usb/gadget/legacy/acm_ms.c-2-/*\ndrivers/usb/gadget/legacy/acm_ms.c:3: * acm_ms.c -- Composite driver, with ACM and mass storage support\ndrivers/usb/gadget/legacy/acm_ms.c-4- *\n--\ndrivers/usb/gadget/legacy/acm_ms.c-29-\ndrivers/usb/gadget/legacy/acm_ms.c:30:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/acm_ms.c-31-\n--\ndrivers/usb/gadget/legacy/acm_ms.c=101=static struct usb_function *f_msg;\n--\ndrivers/usb/gadget/legacy/acm_ms.c-103-/*\ndrivers/usb/gadget/legacy/acm_ms.c:104: * We _always_ have both ACM and mass storage functions.\ndrivers/usb/gadget/legacy/acm_ms.c-105- */\n--\ndrivers/usb/gadget/legacy/acm_ms.c=152=static int acm_ms_bind(struct usb_composite_dev *cdev)\n--\ndrivers/usb/gadget/legacy/acm_ms.c-162-\ndrivers/usb/gadget/legacy/acm_ms.c:163:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/acm_ms.c-164-\tif (IS_ERR(fi_msg)) {\n--\ndrivers/usb/gadget/legacy/acm_ms.c-168-\ndrivers/usb/gadget/legacy/acm_ms.c:169:\t/* set up mass storage function */\ndrivers/usb/gadget/legacy/acm_ms.c-170-\tfsg_config_from_params(\u0026config, \u0026fsg_mod_data, fsg_num_buffers);\n--\ndrivers/usb/gadget/legacy/mass_storage.c-2-/*\ndrivers/usb/gadget/legacy/mass_storage.c:3: * mass_storage.c -- Mass Storage USB Gadget\ndrivers/usb/gadget/legacy/mass_storage.c-4- *\n--\ndrivers/usb/gadget/legacy/mass_storage.c-21- * Since this file serves only administrative purposes and all the\ndrivers/usb/gadget/legacy/mass_storage.c:22: * business logic is implemented in f_mass_storage.* file.  Read\ndrivers/usb/gadget/legacy/mass_storage.c-23- * comments in this file for more detailed description.\n--\ndrivers/usb/gadget/legacy/mass_storage.c-44-\ndrivers/usb/gadget/legacy/mass_storage.c:45:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/mass_storage.c-46-\n--\ndrivers/usb/gadget/legacy/mass_storage.c=139=static int msg_bind(struct usb_composite_dev *cdev)\n--\ndrivers/usb/gadget/legacy/mass_storage.c-144-\ndrivers/usb/gadget/legacy/mass_storage.c:145:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/mass_storage.c-146-\tif (IS_ERR(fi_msg))\n--\ndrivers/usb/gadget/legacy/mass_storage.c=224=static struct usb_composite_driver msg_driver = {\ndrivers/usb/gadget/legacy/mass_storage.c:225:\t.name\t\t= \"g_mass_storage\",\ndrivers/usb/gadget/legacy/mass_storage.c-226-\t.dev\t\t= \u0026msg_device_desc,\n--\ndrivers/usb/gadget/legacy/multi.c=29=MODULE_LICENSE(\"GPL\");\n--\ndrivers/usb/gadget/legacy/multi.c-31-\ndrivers/usb/gadget/legacy/multi.c:32:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/multi.c-33-\n--\ndrivers/usb/gadget/legacy/multi.c=294=static int multi_bind(struct usb_composite_dev *cdev)\n--\ndrivers/usb/gadget/legacy/multi.c-365-\ndrivers/usb/gadget/legacy/multi.c:366:\t/* set up mass storage function */\ndrivers/usb/gadget/legacy/multi.c:367:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/multi.c-368-\tif (IS_ERR(fi_msg)) {\n--\ndrivers/usb/gadget/legacy/nokia.c-22-#include \"u_ecm.h\"\ndrivers/usb/gadget/legacy/nokia.c:23:#include \"f_mass_storage.h\"\ndrivers/usb/gadget/legacy/nokia.c-24-\n--\ndrivers/usb/gadget/legacy/nokia.c=267=static int nokia_bind(struct usb_composite_dev *cdev)\n--\ndrivers/usb/gadget/legacy/nokia.c-311-\ndrivers/usb/gadget/legacy/nokia.c:312:\tfi_msg = usb_get_function_instance(\"mass_storage\");\ndrivers/usb/gadget/legacy/nokia.c-313-\tif (IS_ERR(fi_msg)) {\n--\ndrivers/usb/gadget/legacy/nokia.c-317-\ndrivers/usb/gadget/legacy/nokia.c:318:\t/* set up mass storage function */\ndrivers/usb/gadget/legacy/nokia.c-319-\tfsg_config_from_params(\u0026fsg_config, \u0026fsg_mod_data, fsg_num_buffers);\n--\ndrivers/usb/gadget/legacy/tcm_usb_gadget.c-17-#include \u003clinux/usb/gadget.h\u003e\ndrivers/usb/gadget/legacy/tcm_usb_gadget.c:18:#include \u003clinux/usb/storage.h\u003e\ndrivers/usb/gadget/legacy/tcm_usb_gadget.c-19-#include \u003cscsi/scsi_tcq.h\u003e\n--\ndrivers/usb/gadget/udc/amd5536udc.h-51-\ndrivers/usb/gadget/udc/amd5536udc.h:52:/* Mass storage reset */\ndrivers/usb/gadget/udc/amd5536udc.h-53-#define UDC_MSCRES_DWORD0\t\t\t0x0000ff21\n--\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c=217=int ast_vhub_std_dev_request(struct ast_vhub_ep *ep,\n--\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c-233-\t * we don't do that anymore as we seem to have cases of\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c:234:\t * mass storage getting very upset.\ndrivers/usb/gadget/udc/aspeed-vhub/dev.c-235-\t */\n--\ndrivers/usb/gadget/udc/pch_udc.c=2307=static void pch_udc_svc_control_out(struct pch_udc_dev *dev)\n--\ndrivers/usb/gadget/udc/pch_udc.c-2333-\t\t\tdev-\u003egadget.ep0 = \u0026ep-\u003eep;\ndrivers/usb/gadget/udc/pch_udc.c:2334:\t\t/* If Mass storage Reset */\ndrivers/usb/gadget/udc/pch_udc.c-2335-\t\tif ((dev-\u003esetup_data.bRequestType == 0x21) \u0026\u0026\n--\ndrivers/usb/gadget/udc/pxa25x_udc.c=720=read_fifo (struct pxa25x_ep *ep, struct pxa25x_request *req)\n--\ndrivers/usb/gadget/udc/pxa25x_udc.c-792- * handshaking is magic.  most device protocols don't need control-OUT.\ndrivers/usb/gadget/udc/pxa25x_udc.c:793: * CDC vendor commands (and RNDIS), mass storage CB/CBI, and some other\ndrivers/usb/gadget/udc/pxa25x_udc.c-794- * protocols do use them.\n--\ndrivers/usb/gadget/udc/pxa27x_udc.c-60- *  - zero gadget\ndrivers/usb/gadget/udc/pxa27x_udc.c:61: *  - file storage gadget\ndrivers/usb/gadget/udc/pxa27x_udc.c-62- *  - ether gadget\n--\ndrivers/usb/gadget/udc/pxa27x_udc.c=2292=static struct pxa_udc memory = {\n--\ndrivers/usb/gadget/udc/pxa27x_udc.c-2315-\t\tPXA_EP_IN_BULK(2,  2, 3, 0, 0),\ndrivers/usb/gadget/udc/pxa27x_udc.c:2316:\t\t/* Endpoints for ether gadget, file storage gadget */\ndrivers/usb/gadget/udc/pxa27x_udc.c-2317-\t\tPXA_EP_OUT_BULK(3, 1, 1, 0, 0),\n--\ndrivers/usb/gadget/udc/pxa27x_udc.h=411=struct udc_stats {\n--\ndrivers/usb/gadget/udc/pxa27x_udc.h-426- * @usb_gadget: udc gadget structure\ndrivers/usb/gadget/udc/pxa27x_udc.h:427: * @driver: bound gadget (zero, g_ether, g_mass_storage, ...)\ndrivers/usb/gadget/udc/pxa27x_udc.h-428- * @dev: device\n--\ndrivers/usb/gadget/udc/snps_udc_core.c=1755=static void udc_handle_halt_state(struct udc_ep *ep)\n--\ndrivers/usb/gadget/udc/snps_udc_core.c-1766-\t\t\t * we would set STALL again here to be compliant.\ndrivers/usb/gadget/udc/snps_udc_core.c:1767:\t\t\t * But with current mass storage drivers this does\ndrivers/usb/gadget/udc/snps_udc_core.c-1768-\t\t\t * not work (would produce endless host retries).\n--\ndrivers/usb/gadget/udc/snps_udc_core.c=2425=__acquires(dev-\u003elock)\n--\ndrivers/usb/gadget/udc/snps_udc_core.c-2520-\t\t/*\ndrivers/usb/gadget/udc/snps_udc_core.c:2521:\t\t * mass storage reset must be processed here because\ndrivers/usb/gadget/udc/snps_udc_core.c-2522-\t\t * next packet may be a CLEAR_FEATURE HALT which would not\n--\ndrivers/usb/gadget/udc/udc-xilinx.c=376=static int xudc_dma_send(struct xusb_ep *ep, struct xusb_req *req,\n--\ndrivers/usb/gadget/udc/udc-xilinx.c-421- * @req: pointer to the usb request structure.\ndrivers/usb/gadget/udc/udc-xilinx.c:422: * @buffer: pointer to storage buffer of received data.\ndrivers/usb/gadget/udc/udc-xilinx.c-423- * @length: number of bytes to receive.\n--\ndrivers/usb/host/ehci-hcd.c=454=static int ehci_init(struct usb_hcd *hcd)\n--\ndrivers/usb/host/ehci-hcd.c-544-\t\t *\ndrivers/usb/host/ehci-hcd.c:545:\t\t * With fast usb storage devices and NForce2, \"park\" seems to\ndrivers/usb/host/ehci-hcd.c-546-\t\t * make problems:  throughput reduction (!), data errors...\n--\ndrivers/usb/host/oxu210hp-hcd.c=2985=static int oxu_hcd_init(struct usb_hcd *hcd)\n--\ndrivers/usb/host/oxu210hp-hcd.c-3039-\t\t *\ndrivers/usb/host/oxu210hp-hcd.c:3040:\t\t * With fast usb storage devices and NForce2, \"park\" seems to\ndrivers/usb/host/oxu210hp-hcd.c-3041-\t\t * make problems:  throughput reduction (!), data errors...\n--\ndrivers/usb/host/pci-quirks.c=1030=static int handshake(void __iomem *ptr, u32 mask, u32 done,\n--\ndrivers/usb/host/pci-quirks.c-1047- * start.  This avoids active devices under EHCI being disconnected during the\ndrivers/usb/host/pci-quirks.c:1048: * port switchover, which could cause loss of data on USB storage devices, or\ndrivers/usb/host/pci-quirks.c:1049: * failed boot when the root file system is on a USB mass storage device and is\ndrivers/usb/host/pci-quirks.c-1050- * enumerated under EHCI first.\n--\ndrivers/usb/host/sl811-hcd.c-22- * Status:  Passed basic stress testing, works with hubs, mice, keyboards,\ndrivers/usb/host/sl811-hcd.c:23: * and usb-storage.\ndrivers/usb/host/sl811-hcd.c-24- *\n--\ndrivers/usb/host/xhci.c=3543=static u32 xhci_calculate_no_streams_bitmask(struct xhci_hcd *xhci,\n--\ndrivers/usb/host/xhci.c-3586- * core) to prepare a set of bulk endpoints to use streams.  Streams are used to\ndrivers/usb/host/xhci.c:3587: * coordinate mass storage command queueing across multiple endpoints (basically\ndrivers/usb/host/xhci.c-3588- * a stream ID == a task ID).\n--\ndrivers/usb/host/xhci.c=4202=int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)\n--\ndrivers/usb/host/xhci.c-4253-\t * xhci_discover_or_reset_device(), which may be called as part of\ndrivers/usb/host/xhci.c:4254:\t * mass storage driver error handling.\ndrivers/usb/host/xhci.c-4255-\t */\n--\ndrivers/usb/host/xhci.h=652=struct xhci_virt_ep {\n--\ndrivers/usb/host/xhci.h-657-\tstruct xhci_stream_info\t\t*stream_info;\ndrivers/usb/host/xhci.h:658:\t/* Temporary storage in case the configure endpoint command fails and we\ndrivers/usb/host/xhci.h-659-\t * have to restore the device state to the previous state\n--\ndrivers/usb/host/xhci.h-692-\tbool\t\t\tskip;\ndrivers/usb/host/xhci.h:693:\t/* Bandwidth checking storage */\ndrivers/usb/host/xhci.h-694-\tstruct xhci_bw_info\tbw_info;\n--\ndrivers/usb/host/xhci.h-696-\tunsigned long\t\tstop_time;\ndrivers/usb/host/xhci.h:697:\t/* Isoch Frame ID checking storage */\ndrivers/usb/host/xhci.h-698-\tint\t\t\tnext_frame_id;\n--\ndrivers/usb/image/microtek.c-6- *\ndrivers/usb/image/microtek.c:7: * Parts shamelessly stolen from usb-storage and copyright by their\ndrivers/usb/image/microtek.c-8- * authors. Thanks to Matt Dharm for giving us permission!\n--\ndrivers/usb/image/microtek.c=522=mts_build_transfer_context(struct scsi_cmnd *srb, struct mts_desc* desc)\n--\ndrivers/usb/image/microtek.c-543-\ndrivers/usb/image/microtek.c:544:\t/* Brutally ripped from usb-storage */\ndrivers/usb/image/microtek.c-545-\n--\ndrivers/usb/isp1760/isp1760-hcd.c=1770=static void packetize_urb(struct usb_hcd *hcd,\n--\ndrivers/usb/isp1760/isp1760-hcd.c-1784-\tif (!urb-\u003etransfer_buffer \u0026\u0026 urb-\u003etransfer_buffer_length) {\ndrivers/usb/isp1760/isp1760-hcd.c:1785:\t\t/* XXX This looks like usb storage / SCSI bug */\ndrivers/usb/isp1760/isp1760-hcd.c-1786-\t\tdev_err(hcd-\u003eself.controller,\n--\ndrivers/usb/musb/musb_gadget.c=519=static void rxstate(struct musb *musb, struct musb_request *req)\n--\ndrivers/usb/musb/musb_gadget.c-589-\t\t * is set. Currently short_not_ok flag is set only from\ndrivers/usb/musb/musb_gadget.c:590:\t\t * file_storage and f_mass_storage drivers\ndrivers/usb/musb/musb_gadget.c-591-\t\t */\n--\ndrivers/usb/musb/musb_gadget.c-615-\t * We could operate in DMA mode 1 if we knew the size of the transfer\ndrivers/usb/musb/musb_gadget.c:616:\t * in advance. For mass storage class, request-\u003elength = what the host\ndrivers/usb/musb/musb_gadget.c-617-\t * sends, so that'd work.  But for pretty much everything else,\n--\ndrivers/usb/musb/musb_gadget.c-627-\t *\ndrivers/usb/musb/musb_gadget.c:628:\t * REVISIT an updated g_file_storage can set req-\u003eshort_not_ok, which\ndrivers/usb/musb/musb_gadget.c-629-\t * then becomes usable as a runtime \"use mode 1\" hint...\n--\ndrivers/usb/musb/musb_gadget.c-631-\ndrivers/usb/musb/musb_gadget.c:632:\t\t\t\t/* Experimental: Mode1 works with mass storage use cases */\ndrivers/usb/musb/musb_gadget.c-633-\t\t\t\tif (use_mode_1) {\n--\ndrivers/usb/musb/musb_gadget_ep0.c=641=irqreturn_t musb_g_ep0_irq(struct musb *musb)\n--\ndrivers/usb/musb/musb_gadget_ep0.c-871-\t\t/* This should not happen. But happens with tusb6010 with\ndrivers/usb/musb/musb_gadget_ep0.c:872:\t\t * g_file_storage and high speed. Do nothing.\ndrivers/usb/musb/musb_gadget_ep0.c-873-\t\t */\n--\ndrivers/usb/musb/musb_host.c=1489=static inline int musb_rx_dma_iso_cppi41(struct dma_controller *dma,\n--\ndrivers/usb/musb/musb_host.c-1530- *\ndrivers/usb/musb/musb_host.c:1531: *\tSo for example, usb-storage sets URB_SHORT_NOT_OK, and would\ndrivers/usb/musb/musb_host.c-1532- *\tthus be a great candidate for using mode 1 ... for all but the\n--\ndrivers/usb/musb/musb_host.c=1535=static int musb_rx_dma_inventra_cppi41(struct dma_controller *dma,\n--\ndrivers/usb/musb/musb_host.c-1589-/* Disadvantage of using mode 1:\ndrivers/usb/musb/musb_host.c:1590: *\tIt's basically usable only for mass storage class; essentially all\ndrivers/usb/musb/musb_host.c-1591- *\tother protocols also terminate transfers on short packets.\n--\ndrivers/usb/serial/f81534.c=762=static bool f81534_check_port_hw_disabled(struct usb_serial *serial, int phy)\n--\ndrivers/usb/serial/f81534.c-819-/*\ndrivers/usb/serial/f81534.c:820: * We had 2 generation of F81532/534 IC. All has an internal storage.\ndrivers/usb/serial/f81534.c-821- *\n--\ndrivers/usb/serial/f81534.c-823- * internal data will used. All mode and gpio control should manually set\ndrivers/usb/serial/f81534.c:824: * by AP or Driver and all storage space value are 0xff. The\ndrivers/usb/serial/f81534.c-825- * f81534_calc_num_ports() will run to final we marked as \"oldest version\"\n--\ndrivers/usb/storage/Kconfig=8=config USB_STORAGE\n--\ndrivers/usb/storage/Kconfig-11-\thelp\ndrivers/usb/storage/Kconfig:12:\t  Say Y here if you want to connect USB mass storage devices to your\ndrivers/usb/storage/Kconfig-13-\t  computer's USB port. This is the driver you need for USB\n--\ndrivers/usb/storage/Kconfig-20-\t  probably also need 'SCSI device support: SCSI disk support'\ndrivers/usb/storage/Kconfig:21:\t  (BLK_DEV_SD) for most USB storage devices.\ndrivers/usb/storage/Kconfig-22-\ndrivers/usb/storage/Kconfig-23-\t  To compile this driver as a module, choose M here: the\ndrivers/usb/storage/Kconfig:24:\t  module will be called usb-storage.\ndrivers/usb/storage/Kconfig-25-\n--\ndrivers/usb/storage/Kconfig=80=config USB_STORAGE_USBAT\ndrivers/usb/storage/Kconfig:81:\ttristate \"USBAT/USBAT02-based storage support\"\ndrivers/usb/storage/Kconfig-82-\thelp\ndrivers/usb/storage/Kconfig:83:\t  Say Y here to include additional code to support storage devices\ndrivers/usb/storage/Kconfig-84-\t  based on the SCM/Shuttle USBAT/USBAT02 processors.\n--\ndrivers/usb/storage/Kconfig=152=config USB_STORAGE_KARMA\n--\ndrivers/usb/storage/Kconfig-157-\ndrivers/usb/storage/Kconfig:158:\t  This code places the Rio Karma into mass storage mode, enabling\n\n"
}

							input: 30875
							output: 34
							thoughts: 17

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into the Kconfig - USB Drivers**

Okay, time to get to the heart of the matter. Based on the task at hand, I need to get into the nitty-gritty configuration. I'm going to start by focusing on the `drivers/usb/Kconfig` file. I'll zero in around line 116. This is generally where the core USB driver configuration options tend to reside. From experience, this section often contains the conditional dependencies and options that govern the enabling or disabling of specific USB features or controller support. It will be the jump off point to see what can be configured, and what the dependencies are.

{
  "File": "drivers/usb/Kconfig",
  "FirstLine": 110,
  "LineCount": 20
}

{
  "Contents": " 110:\tsource \"drivers/usb/host/Kconfig\"\n 111:\t\n 112:\tsource \"drivers/usb/renesas_usbhs/Kconfig\"\n 113:\t\n 114:\tsource \"drivers/usb/class/Kconfig\"\n 115:\t\n 116:\tsource \"drivers/usb/storage/Kconfig\"\n 117:\t\n 118:\tsource \"drivers/usb/image/Kconfig\"\n 119:\t\n 120:\tsource \"drivers/usb/usbip/Kconfig\"\n 121:\t\n 122:\tendif\n 123:\t\n 124:\tcomment \"USB dual-mode controller drivers\"\n 125:\t\n 126:\tsource \"drivers/usb/cdns3/Kconfig\"\n 127:\t\n 128:\tsource \"drivers/usb/fotg210/Kconfig\"\n 129:\t\n"
}

							input: 31343
							output: 149
							thoughts: 1769

**Fuzzing Analysis for USB Storage Driver Patch**

Alright, let's break this down. First, the code: the patch resides within the USB storage subsystem, specifically the `sierra_ms` module. We need to ensure `USB_STORAGE`, `USB` (or `USB_SUPPORT`), and `SCSI` are enabled in the kernel configuration. I've double-checked that those dependencies are correctly reflected in the Kconfig and Makefile files. The crucial function modified is `sierra_get_swoc_info`. It's statically defined, but used in `sierra_ms_init` and `truinst_show`.

My immediate concern is: Is this code actually reachable? Syzkaller's USB emulation (specifically Raw Gadget) provides a positive answer. It simulates USB devices, and when it emulates a Sierra device, the USB storage driver binds and calls `sierra_ms_init`. This means the functions are exercised in a controlled, emulated environment. The patch introduces a check on the number of bytes returned by a control request, guarding against the use of uninitialized data which is a good thing and could be tested by fuzzing.

Now, considering the patch's impact, the fuzzing criteria: We're introducing a defensive check, which is a prime target for fuzzing. This patch modifies reachable code that's used via virtual USB buses emulated in standard QEMU. Given the focus on error handling and the potential for regressions related to how incomplete responses are handled, I'm confident we have a valid target. It avoids the negative criteria as well as we can reach the drivers using a standard USB Gadget. Therefore, the "WorthFuzzing" flag should be set to TRUE.

For `FocusSymbols`, I'll list the key functions involved: `sierra_get_swoc_info` (even though it's static, it's a specific entry point in the execution flow), `sierra_ms_init` (the initialization function, exported) and `truinst_show` because it's relevant to a potential regression as well.

In summary:

* `EnableConfigs`: `["USB_STORAGE", "USB", "SCSI"]`
* `FocusSymbols`: `["sierra_get_swoc_info", "sierra_ms_init", "truinst_show"]`
* `WorthFuzzing`: `true`
* `Reasoning`: The patch modifies reachable code within a USB storage driver. The new check can be exercised through USB emulation and could reveal regressions in error handling.

{
  "EnableConfigs": [
    "USB_STORAGE",
    "USB",
    "SCSI"
  ],
  "FocusSymbols": [
    "sierra_get_swoc_info",
    "sierra_ms_init",
    "truinst_show"
  ],
  "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "USB_STORAGE",
    "USB",
    "SCSI"
  ],
  "FocusSymbols": [
    "sierra_get_swoc_info",
    "sierra_ms_init",
    "truinst_show"
  ],
  "Reasoning": "The patch adds a validation check for short USB IN transfers in sierra_get_swoc_info() to prevent using uninitialized memory. This code is in the USB mass storage driver for Sierra Wireless devices, which is reachable in virtualized fuzzing environments via emulated USB devices (e.g., Syzkaller USB Raw Gadget) during device initialization and sysfs queries.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

{
  "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 8176a97483e2ad011dcc3443b1fcdd8fc17fc6d7
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Sep 16 21:42:05 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/usb/storage/sierra_ms.c b/drivers/usb/storage/sierra_ms.c
index 177fa6cd143ab..8755fda42eed2 100644
--- a/drivers/usb/storage/sierra_ms.c
+++ b/drivers/usb/storage/sierra_ms.c
@@ -76,6 +76,12 @@ static int sierra_get_swoc_info(struct usb_device *udev,
 			(void *) swocInfo,		/* void *data        */
 			sizeof(struct swoc_info),	/* __u16 size 	     */
 			USB_CTRL_SET_TIMEOUT);		/* int timeout 	     */
+	/*
+	 * A short IN transfer leaves the tail of swocInfo uninitialized;
+	 * only a full transfer is valid.
+	 */
+	if (result != sizeof(struct swoc_info))
+		return -EIO;
 
 	swocInfo->LinuxSKU = le16_to_cpu(swocInfo->LinuxSKU);
 	swocInfo->LinuxVer = le16_to_cpu(swocInfo->LinuxVer);

							input: 2170
							output: 39
							thoughts: 65

**Analyzing the Sierra MS Driver Patch**

Okay, so the user wants me to dive into a patch affecting the `drivers/usb/storage/sierra_ms.c` file. Right, let's get down to brass tacks. My initial thought is to, of course, understand the context. I'll need to see the actual patch first, to be able to assess its impact. But, before I even get into that, let me ensure I have a good grasp of the surrounding code for that file, specifically around line 76 – that seems like a good place to start my investigation. Let's start with a `read-file` command to load up the relevant section of `sierra_ms.c` and take a look. From that, I can get a feel for what might be impacted by this patch, any dependencies or interactions it may have with other parts of the driver, and formulate some hypotheses about its purpose.

{
  "File": "drivers/usb/storage/sierra_ms.c",
  "FirstLine": 50,
  "LineCount": 80
}

{
  "Contents": "  50:\t\tint result;\n  51:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: %s\", \"DEVICE MODE SWITCH\\n\");\n  52:\t\tresult = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),\n  53:\t\t\t\tSWIMS_USB_REQUEST_SetSwocMode,\t/* __u8 request      */\n  54:\t\t\t\tUSB_TYPE_VENDOR | USB_DIR_OUT,\t/* __u8 request type */\n  55:\t\t\t\teSWocMode,\t\t\t/* __u16 value       */\n  56:\t\t\t\t0x0000,\t\t\t\t/* __u16 index       */\n  57:\t\t\t\tNULL,\t\t\t\t/* void *data        */\n  58:\t\t\t\t0,\t\t\t\t/* __u16 size \t     */\n  59:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/* int timeout       */\n  60:\t\treturn result;\n  61:\t}\n  62:\t\n  63:\t\n  64:\tstatic int sierra_get_swoc_info(struct usb_device *udev,\n  65:\t\t\t\t\tstruct swoc_info *swocInfo)\n  66:\t{\n  67:\t\tint result;\n  68:\t\n  69:\t\tdev_dbg(\u0026udev-\u003edev, \"SWIMS: Attempting to get TRU-Install info\\n\");\n  70:\t\n  71:\t\tresult = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),\n  72:\t\t\t\tSWIMS_USB_REQUEST_GetSwocInfo,\t/* __u8 request      */\n  73:\t\t\t\tUSB_TYPE_VENDOR | USB_DIR_IN,\t/* __u8 request type */\n  74:\t\t\t\t0,\t\t\t\t/* __u16 value       */\n  75:\t\t\t\t0,\t\t\t\t/* __u16 index       */\n  76:\t\t\t\t(void *) swocInfo,\t\t/* void *data        */\n  77:\t\t\t\tsizeof(struct swoc_info),\t/* __u16 size \t     */\n  78:\t\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/* int timeout \t     */\n  79:\t\t/*\n  80:\t\t * A short IN transfer leaves the tail of swocInfo uninitialized;\n  81:\t\t * only a full transfer is valid.\n  82:\t\t */\n  83:\t\tif (result != sizeof(struct swoc_info))\n  84:\t\t\treturn -EIO;\n  85:\t\n  86:\t\tswocInfo-\u003eLinuxSKU = le16_to_cpu(swocInfo-\u003eLinuxSKU);\n  87:\t\tswocInfo-\u003eLinuxVer = le16_to_cpu(swocInfo-\u003eLinuxVer);\n  88:\t\treturn result;\n  89:\t}\n  90:\t\n  91:\tstatic void debug_swoc(const struct device *dev, struct swoc_info *swocInfo)\n  92:\t{\n  93:\t\tdev_dbg(dev, \"SWIMS: SWoC Rev: %02d\\n\", swocInfo-\u003erev);\n  94:\t\tdev_dbg(dev, \"SWIMS: Linux SKU: %04X\\n\", swocInfo-\u003eLinuxSKU);\n  95:\t\tdev_dbg(dev, \"SWIMS: Linux Version: %04X\\n\", swocInfo-\u003eLinuxVer);\n  96:\t}\n  97:\t\n  98:\t\n  99:\tstatic ssize_t truinst_show(struct device *dev, struct device_attribute *attr,\n 100:\t\t\t\tchar *buf)\n 101:\t{\n 102:\t\tstruct swoc_info *swocInfo;\n 103:\t\tstruct usb_interface *intf = to_usb_interface(dev);\n 104:\t\tstruct usb_device *udev = interface_to_usbdev(intf);\n 105:\t\tint result;\n 106:\t\tif (swi_tru_install == TRU_FORCE_MS) {\n 107:\t\t\tresult = sysfs_emit(buf, \"Forced Mass Storage\\n\");\n 108:\t\t} else {\n 109:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);\n 110:\t\t\tif (!swocInfo) {\n 111:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 112:\t\t\t\treturn -ENOMEM;\n 113:\t\t\t}\n 114:\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 115:\t\t\tif (result \u003c 0) {\n 116:\t\t\t\tdev_dbg(dev, \"SWIMS: failed SWoC query\\n\");\n 117:\t\t\t\tkfree(swocInfo);\n 118:\t\t\t\tsysfs_emit(buf, \"Error\\n\");\n 119:\t\t\t\treturn -EIO;\n 120:\t\t\t}\n 121:\t\t\tdebug_swoc(dev, swocInfo);\n 122:\t\t\tresult = sysfs_emit(buf,\n 123:\t\t\t\t\t    \"REV=%02d SKU=%04X VER=%04X\\n\",\n 124:\t\t\t\t\t    swocInfo-\u003erev,\n 125:\t\t\t\t\t    swocInfo-\u003eLinuxSKU,\n 126:\t\t\t\t\t    swocInfo-\u003eLinuxVer);\n 127:\t\t\tkfree(swocInfo);\n 128:\t\t}\n 129:\t\treturn result;\n"
}

							input: 3835
							output: 40
							thoughts: 21

Okay, let's dive into the rest of `drivers/usb/storage/sierra_ms.c`. I need to get a clear picture of how this driver handles Mass Storage devices from Sierra Wireless modems, specifically. I know this file likely contains the critical functions for initializing the device, managing its communication with the USB interface, and interpreting the SCSI commands related to storage operations. I need to understand how it deals with device-specific quirks or workarounds, as I'm sure there are plenty. I'm especially interested in whether it uses any custom vendor-specific commands, or relies solely on standard SCSI commands. I'll be looking for the standard functions: probe, disconnect, and the bulk transfer implementations for data in and data out and whether or not it handles multiple LUNs. I want to see how the code handles error conditions, particularly those common with unreliable mobile devices. I'll pay close attention to the use of any specific USB request blocks (URBs) or data structures, any vendor specific USB endpoints. I will check for any unusual data buffering techniques. Any power management considerations? I will check for any issues. I'll be looking for ways to improve performance, add device support, or address any known bugs.

{
  "File": "drivers/usb/storage/sierra_ms.c",
  "FirstLine": 130,
  "LineCount": 60
}

{
  "Contents": " 130:\t}\n 131:\tstatic DEVICE_ATTR_RO(truinst);\n 132:\t\n 133:\tint sierra_ms_init(struct us_data *us)\n 134:\t{\n 135:\t\tint result, retries;\n 136:\t\tstruct swoc_info *swocInfo;\n 137:\t\tstruct usb_device *udev;\n 138:\t\n 139:\t\tudev = us-\u003epusb_dev;\n 140:\t\n 141:\t\t/* Force Modem mode */\n 142:\t\tif (swi_tru_install == TRU_FORCE_MODEM) {\n 143:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Modem Mode\\n\");\n 144:\t\t\tresult = sierra_set_ms_mode(udev, SWIMS_SET_MODE_Modem);\n 145:\t\t\tif (result \u003c 0)\n 146:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed to switch to modem mode\\n\");\n 147:\t\t\treturn -EIO;\n 148:\t\t}\n 149:\t\t/* Force Mass Storage mode (keep CD-Rom) */\n 150:\t\telse if (swi_tru_install == TRU_FORCE_MS) {\n 151:\t\t\tusb_stor_dbg(us, \"SWIMS: Forcing Mass Storage Mode\\n\");\n 152:\t\t\tgoto complete;\n 153:\t\t}\n 154:\t\t/* Normal TRU-Install Logic */\n 155:\t\telse {\n 156:\t\t\tusb_stor_dbg(us, \"SWIMS: Normal SWoC Logic\\n\");\n 157:\t\n 158:\t\t\tswocInfo = kmalloc(sizeof(struct swoc_info),\n 159:\t\t\t\t\tGFP_KERNEL);\n 160:\t\t\tif (!swocInfo)\n 161:\t\t\t\treturn -ENOMEM;\n 162:\t\n 163:\t\t\tretries = 3;\n 164:\t\t\tdo {\n 165:\t\t\t\tretries--;\n 166:\t\t\t\tresult = sierra_get_swoc_info(udev, swocInfo);\n 167:\t\t\t\tif (result \u003c 0) {\n 168:\t\t\t\t\tusb_stor_dbg(us, \"SWIMS: Failed SWoC query\\n\");\n 169:\t\t\t\t\tschedule_timeout_uninterruptible(2*HZ);\n 170:\t\t\t\t}\n 171:\t\t\t} while (retries \u0026\u0026 result \u003c 0);\n 172:\t\n 173:\t\t\tif (result \u003c 0) {\n 174:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Completely failed SWoC query\\n\");\n 175:\t\t\t\tkfree(swocInfo);\n 176:\t\t\t\treturn -EIO;\n 177:\t\t\t}\n 178:\t\n 179:\t\t\tdebug_swoc(\u0026us-\u003epusb_dev-\u003edev, swocInfo);\n 180:\t\n 181:\t\t\t/*\n 182:\t\t\t * If there is not Linux software on the TRU-Install device\n 183:\t\t\t * then switch to modem mode\n 184:\t\t\t */\n 185:\t\t\tif (!containsFullLinuxPackage(swocInfo)) {\n 186:\t\t\t\tusb_stor_dbg(us, \"SWIMS: Switching to Modem Mode\\n\");\n 187:\t\t\t\tresult = sierra_set_ms_mode(udev,\n 188:\t\t\t\t\tSWIMS_SET_MODE_Modem);\n 189:\t\t\t\tif (result \u003c 0)\n"
}

							input: 5075
							output: 19
							thoughts: 2023

**Analysis of the SWIMS SWoC Information Retrieval Patch**

Okay, let's break this down. My initial assessment is that this patch *fixes* a potential uninitialized memory read, not introduces one. The code, before the patch, calls `usb_control_msg` to retrieve SWoC information into a `swocInfo` struct. The critical point is that `usb_control_msg` returns the number of bytes transferred. If the transfer is short, the tail of `swocInfo` would be uninitialized, leading to a possible uninitialized read later. The patch explicitly addresses this by adding a check: if the returned size from `usb_control_msg` isn't the full `sizeof(struct swoc_info)`, the function now returns `-EIO`, preventing access to the uninitialized data.

The previous logic would proceed to read `swocInfo->LinuxSKU` and potentially perform operations on potentially garbage data, which the patch prevents. Subsequent code paths, in `truinst_show` and `sierra_ms_init`, correctly handle the `-EIO` error by freeing the allocated `swocInfo` and returning `-EIO`. This is the correct behavior because `usb_control_msg` either successfully transfers the entire struct, leaving all members initialized, or it returns an error and aborts.

The key question is whether this warrants a dedicated KMSAN session. The instructions are very clear: KMSAN is only needed if the code changes *introduce or expose* uninitialized memory risks *that are detected ONLY by KMSAN*. This patch *removes* an uninitialized read scenario. It *doesn't* introduce any new risks, nor does it modify structures sent to userspace, introduce conditional logic based on potentially uninitialized fields, modify allocation or initialization of complex data structures, or change bounds checks in a way that allows access to uninitialized data.

While the patch is a *fix* that may have been *triggered by KMSAN* or other bug detectors, it does not itself introduce a new KMSAN problem. I'm confident that KASAN or other standard bug detectors are sufficient for this patch and the scenario it addresses. Therefore, `NeedsKMSAN` should be set to `false`. I would still need to review the structure definition to ensure my analysis is complete, but I am confident.

{
  "Expression": "struct swoc_info"
}

{
  "Output": "drivers/usb/storage/sierra_ms.c=28=MODULE_PARM_DESC(swi_tru_install, \"TRU-Install mode (1=Full Logic (def),\"\n--\ndrivers/usb/storage/sierra_ms.c-30-\ndrivers/usb/storage/sierra_ms.c:31:struct swoc_info {\ndrivers/usb/storage/sierra_ms.c-32-\t__u8 rev;\n--\ndrivers/usb/storage/sierra_ms.c-38-\ndrivers/usb/storage/sierra_ms.c:39:static bool containsFullLinuxPackage(struct swoc_info *swocInfo)\ndrivers/usb/storage/sierra_ms.c-40-{\n--\ndrivers/usb/storage/sierra_ms.c=64=static int sierra_get_swoc_info(struct usb_device *udev,\ndrivers/usb/storage/sierra_ms.c:65:\t\t\t\tstruct swoc_info *swocInfo)\ndrivers/usb/storage/sierra_ms.c-66-{\n--\ndrivers/usb/storage/sierra_ms.c-76-\t\t\t(void *) swocInfo,\t\t/* void *data        */\ndrivers/usb/storage/sierra_ms.c:77:\t\t\tsizeof(struct swoc_info),\t/* __u16 size \t     */\ndrivers/usb/storage/sierra_ms.c-78-\t\t\tUSB_CTRL_SET_TIMEOUT);\t\t/* int timeout \t     */\n--\ndrivers/usb/storage/sierra_ms.c-82-\t */\ndrivers/usb/storage/sierra_ms.c:83:\tif (result != sizeof(struct swoc_info))\ndrivers/usb/storage/sierra_ms.c-84-\t\treturn -EIO;\n--\ndrivers/usb/storage/sierra_ms.c-90-\ndrivers/usb/storage/sierra_ms.c:91:static void debug_swoc(const struct device *dev, struct swoc_info *swocInfo)\ndrivers/usb/storage/sierra_ms.c-92-{\n--\ndrivers/usb/storage/sierra_ms.c=99=static ssize_t truinst_show(struct device *dev, struct device_attribute *attr,\n--\ndrivers/usb/storage/sierra_ms.c-101-{\ndrivers/usb/storage/sierra_ms.c:102:\tstruct swoc_info *swocInfo;\ndrivers/usb/storage/sierra_ms.c-103-\tstruct usb_interface *intf = to_usb_interface(dev);\n--\ndrivers/usb/storage/sierra_ms.c-108-\t} else {\ndrivers/usb/storage/sierra_ms.c:109:\t\tswocInfo = kmalloc(sizeof(struct swoc_info), GFP_KERNEL);\ndrivers/usb/storage/sierra_ms.c-110-\t\tif (!swocInfo) {\n--\ndrivers/usb/storage/sierra_ms.c=133=int sierra_ms_init(struct us_data *us)\n--\ndrivers/usb/storage/sierra_ms.c-135-\tint result, retries;\ndrivers/usb/storage/sierra_ms.c:136:\tstruct swoc_info *swocInfo;\ndrivers/usb/storage/sierra_ms.c-137-\tstruct usb_device *udev;\n--\ndrivers/usb/storage/sierra_ms.c-157-\ndrivers/usb/storage/sierra_ms.c:158:\t\tswocInfo = kmalloc(sizeof(struct swoc_info),\ndrivers/usb/storage/sierra_ms.c-159-\t\t\t\tGFP_KERNEL);\n"
}

							input: 8540
							output: 39
							thoughts: 26

Here's a summary of my thought process, as if I were analyzing that specific code section:

**Analyzing `sierra_ms.c` (Lines 30-45)**

Alright, let's dive into lines 30-45 of `drivers/usb/storage/sierra_ms.c`. My initial expectation is this section likely deals with device setup or perhaps probing of some kind, given the file path and driver name. The "ms" in `sierra_ms.c` strongly suggests this driver handles mass storage devices from Sierra Wireless, which are often used in cellular modems. So, I'm expecting to see code specific to that vendor's hardware.

Now, I need to look closely for anything that immediately jumps out. Specifically, I'm watching for:

* Any mention of specific USB descriptors. Are they identifying the Sierra device? What are the bInterfaceClass, bInterfaceSubClass, and bInterfaceProtocol values defined here?
* Do I see the code checking for a particular USB VID/PID combination? Is it specifically looking for Sierra devices, and what version, or does it try to generalize a bit? This will be crucial.
* Are there any data structures or function calls that suggest an initial setup sequence? I'm hoping to see how the code identifies the mass storage LUN(s).
* Any error handling or conditional logic is also very important. What's the fall-back behavior if something goes wrong during the initialization?
* Are there any assumptions made about the device configuration? Does the code take into account the various ways in which the device is configured.

This is all to get a high-level understanding of what happens when the device is first plugged in. I need to understand how the driver determines whether this is a Sierra device and, if so, how it handles the initial setup. My goal is to quickly grasp the logical flow of this part of the driver. Let's see what's actually in those lines...

{
  "File": "drivers/usb/storage/sierra_ms.c",
  "FirstLine": 30,
  "LineCount": 20
}

{
  "Contents": "  30:\t\n  31:\tstruct swoc_info {\n  32:\t\t__u8 rev;\n  33:\t\t__u8 reserved[8];\n  34:\t\t__u16 LinuxSKU;\n  35:\t\t__u16 LinuxVer;\n  36:\t\t__u8 reserved2[47];\n  37:\t} __attribute__((__packed__));\n  38:\t\n  39:\tstatic bool containsFullLinuxPackage(struct swoc_info *swocInfo)\n  40:\t{\n  41:\t\tif ((swocInfo-\u003eLinuxSKU \u003e= 0x2100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x2FFF) ||\n  42:\t\t   (swocInfo-\u003eLinuxSKU \u003e= 0x7100 \u0026\u0026 swocInfo-\u003eLinuxSKU \u003c= 0x7FFF))\n  43:\t\t\treturn true;\n  44:\t\telse\n  45:\t\t\treturn false;\n  46:\t}\n  47:\t\n  48:\tstatic int sierra_set_ms_mode(struct usb_device *udev, __u16 eSWocMode)\n  49:\t{\n"
}

							input: 9330
							output: 167
							thoughts: 388

**My Analysis of the Uninitialized Memory Fix**

Alright, let's break this down. That `struct swoc_info` is 60 bytes, I see that right away. And here's the core issue: the `usb_control_msg` call, when it short-reads, leaves the tail of that `swoc_info` structure filled with uninitialized heap memory allocated by `kmalloc()`. Then, fields like `swocInfo->LinuxSKU` and `swocInfo->LinuxVer`, at offsets 9 and 11, and possibly others, get read before they're properly set. This data could leak into sysfs or be used in `containsFullLinuxPackage(swocInfo)`, and that's a security risk.

The patch itself is simple but effective. It introduces this essential check:

```c
	if (result != sizeof(struct swoc_info))
		return -EIO;
```

Basically, if the `usb_control_msg` doesn't return the full expected structure, it returns an error. This prevents any of that partially initialized data from ever being used. The function now ensures a complete read before processing, which eliminates the potential read of uninitialized data.

As for KMSAN, I concur. The patch addresses an existing uninitialized memory vulnerability by adding this check. It's not creating new memory, passing uninitialized kernel structures to user space, nor altering any boundaries. It's simply ensuring a complete read. Therefore, no KMSAN fuzzing is necessary here, it's a closed loop, problem solved. The patch directly targets the source of the issue without introducing any new areas for concern.

{
  "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch in drivers/usb/storage/sierra_ms.c fixes an uninitialized heap memory issue rather than introducing one. Previously, a short IN transfer from usb_control_msg() could leave the trailing bytes of swocInfo (allocated via kmalloc) uninitialized, leading to reads of uninitialized data in LinuxSKU and LinuxVer. The patch adds a check (result != sizeof(struct swoc_info)) that immediately bails out with -EIO on short or failed transfers. The patch does not introduce new structures, modify uninitialized variable usage, or expose any uninitialized memory to user space. Therefore, 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)