AI Trajectory

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Seq	Timestamp	Type	Name	Duration
0/0	2026/09/16 02:41	flow	patch-triage	1m Args: null Results: { "EnableConfigs": [ "CONFIGFS_FS", "NVME_TARGET", "NVME_TARGET_PASSTHRU", "BLK_DEV_NVME" ], "FocusSymbols": [ "nvmet_file_ns_enable", "nvmet_passthru_ctrl_enable", "configfs_path_is_configfs" ], "KMSANReasoning": "The patch series prevents NVMe target namespaces and passthru controllers from using backing files residing in configfs (which prevents recursion, deadlocks, and refcount issues). It introduces a helper `configfs_path_is_configfs` and replaces `filp_open` with `kern_path()`, validation, and `file_open_root()`.\n\nKMSAN vs KASAN applicability:\n- The stack-allocated `struct path path` in both `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` is only accessed after `kern_path()` returns success (0), guaranteeing full initialization before reading or releasing.\n- No data is copied to user space or exposed via ioctls/attributes, eliminating any risk of info-leaks.\n- There are no uninitialized variables, conditional branches on undefined data, or partial struct initializations.\n- Any potential issues in this patch (e.g., refcounting with `path_put`, locking, or invalid pointer dereferences) are caught by KASAN and standard kernel debuggers (LOCKDEP/refcount_t checking).\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false, "Reasoning": "The patch introduces configfs_path_is_configfs() and replaces filp_open() with kern_path() + file_open_root() in nvmet_file_ns_enable() and nvmet_passthru_ctrl_enable() to prevent configfs files from backing NVMe target namespaces or passthru controllers. This modifies reachable path lookup and file opening logic that is accessible from userspace via configfs writes to /sys/kernel/config/nvmet/.", "WorthFuzzing": true }
1/1	2026/09/16 02:41	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 66f39a483bed994e5175a582619864f05251d3eb\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Sep 16 02:41:04 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c\nindex 0b22d183f9279..fbe58aa4a85ac 100644\n--- a/drivers/nvme/target/io-cmd-file.c\n+++ b/drivers/nvme/target/io-cmd-file.c\n@@ -8,7 +8,9 @@\n #include \u003clinux/uio.h\u003e\n #include \u003clinux/falloc.h\u003e\n #include \u003clinux/file.h\u003e\n+#include \u003clinux/configfs.h\u003e\n #include \u003clinux/fs.h\u003e\n+#include \u003clinux/namei.h\u003e\n #include \"nvmet.h\"\n \n #define NVMET_MIN_MPOOL_OBJ\t\t16\n@@ -33,12 +35,28 @@ void nvmet_file_ns_disable(struct nvmet_ns ns)\n int nvmet_file_ns_enable(struct nvmet_ns ns)\n {\n \tint flags = O_RDWR \| O_LARGEFILE;\n+\tstruct path path;\n \tint ret = 0;\n \n \tif (!ns-\u003ebuffered_io)\n \t\tflags \|= O_DIRECT;\n \n-\tns-\u003efile = filp_open(ns-\u003edevice_path, flags, 0);\n+\tret = kern_path(ns-\u003edevice_path, LOOKUP_FOLLOW, \u0026path);\n+\tif (ret) {\n+\t\tpr_err(\"failed to open file %s: (%d)\\n\",\n+\t\t ns-\u003edevice_path, ret);\n+\t\treturn ret;\n+\t}\n+\n+\tif (configfs_path_is_configfs(\u0026path)) {\n+\t\tpr_err(\"configfs paths cannot back namespace %s\\n\",\n+\t\t ns-\u003edevice_path);\n+\t\tpath_put(\u0026path);\n+\t\treturn -EINVAL;\n+\t}\n+\n+\tns-\u003efile = file_open_root(\u0026path, \"\", flags, 0);\n+\tpath_put(\u0026path);\n \tif (IS_ERR(ns-\u003efile)) {\n \t\tret = PTR_ERR(ns-\u003efile);\n \t\tpr_err(\"failed to open file %s: (%d)\\n\",\ndiff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c\nindex fa6527c537e26..aa1778c9ee28d 100644\n--- a/drivers/nvme/target/passthru.c\n+++ b/drivers/nvme/target/passthru.c\n@@ -9,6 +9,8 @@\n /\n #define pr_fmt(fmt) KBUILD_MODNAME \": \" fmt\n #include \u003clinux/module.h\u003e\n+#include \u003clinux/configfs.h\u003e\n+#include \u003clinux/namei.h\u003e\n \n #include \"../host/nvme.h\"\n #include \"nvmet.h\"\n@@ -588,6 +590,7 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys)\n {\n \tstruct nvme_ctrl ctrl;\n \tstruct file file;\n+\tstruct path path;\n \tint ret = -EINVAL;\n \tvoid old;\n \n@@ -602,7 +605,19 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys)\n \t\tgoto out_unlock;\n \t}\n \n-\tfile = filp_open(subsys-\u003epassthru_ctrl_path, O_RDWR, 0);\n+\tret = kern_path(subsys-\u003epassthru_ctrl_path, LOOKUP_FOLLOW, \u0026path);\n+\tif (ret)\n+\t\tgoto out_unlock;\n+\n+\tif (configfs_path_is_configfs(\u0026path)) {\n+\t\tpr_err(\"configfs paths cannot back passthru controller %s\\n\",\n+\t\t subsys-\u003epassthru_ctrl_path);\n+\t\tpath_put(\u0026path);\n+\t\tgoto out_unlock;\n+\t}\n+\n+\tfile = file_open_root(\u0026path, \"\", O_RDWR, 0);\n+\tpath_put(\u0026path);\n \tif (IS_ERR(file)) {\n \t\tret = PTR_ERR(file);\n \t\tgoto out_unlock;\ndiff --git a/fs/configfs/mount.c b/fs/configfs/mount.c\nindex d8cac1cbf3bd5..8abbe3afaa5eb 100644\n--- a/fs/configfs/mount.c\n+++ b/fs/configfs/mount.c\n@@ -118,6 +118,12 @@ static struct file_system_type configfs_fs_type = {\n };\n MODULE_ALIAS_FS(\"configfs\");\n \n+bool configfs_path_is_configfs(const struct path path)\n+{\n+\treturn path-\u003edentry-\u003ed_sb-\u003es_type == \u0026configfs_fs_type;\n+}\n+EXPORT_SYMBOL_GPL(configfs_path_is_configfs);\n+\n struct dentry configfs_pin_fs(void)\n {\n \tint err = simple_pin_fs(\u0026configfs_fs_type, \u0026configfs_mount,\ndiff --git a/include/linux/configfs.h b/include/linux/configfs.h\nindex ef65c75beeaad..55df734da634b 100644\n--- a/include/linux/configfs.h\n+++ b/include/linux/configfs.h\n@@ -34,6 +34,7 @@ struct configfs_group_operations;\n struct configfs_attribute;\n struct configfs_bin_attribute;\n struct configfs_subsystem;\n+struct path;\n \n struct config_item {\n \tchar\t\t\tci_name;\n@@ -243,6 +244,7 @@ void configfs_unregister_subsystem(struct configfs_subsystem subsys);\n int configfs_register_group(struct config_group parent_group,\n \t\t\t struct config_group group);\n void configfs_unregister_group(struct config_group group);\n+bool configfs_path_is_configfs(const struct path path);\n \n void configfs_remove_default_groups(struct config_group *group);\n \n" }
2/1	2026/09/16 02:41	agent	patch-evaluator	1m Model: core Args: null Results: { "EnableConfigs": [ "CONFIGFS_FS", "NVME_TARGET", "NVME_TARGET_PASSTHRU", "BLK_DEV_NVME" ], "FocusSymbols": [ "nvmet_file_ns_enable", "nvmet_passthru_ctrl_enable", "configfs_path_is_configfs" ], "Reasoning": "The patch introduces configfs_path_is_configfs() and replaces filp_open() with kern_path() + file_open_root() in nvmet_file_ns_enable() and nvmet_passthru_ctrl_enable() to prevent configfs files from backing NVMe target namespaces or passthru controllers. This modifies reachable path lookup and file opening logic that is accessible from userspace via configfs writes to /sys/kernel/config/nvmet/.", "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 66f39a483bed994e5175a582619864f05251d3eb Author: syz-cluster <triage@syzkaller.com> Date: Wed Sep 16 02:41:04 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c index 0b22d183f9279..fbe58aa4a85ac 100644 --- a/drivers/nvme/target/io-cmd-file.c +++ b/drivers/nvme/target/io-cmd-file.c @@ -8,7 +8,9 @@ #include <linux/uio.h> #include <linux/falloc.h> #include <linux/file.h> +#include <linux/configfs.h> #include <linux/fs.h> +#include <linux/namei.h> #include "nvmet.h" #define NVMET_MIN_MPOOL_OBJ 16 @@ -33,12 +35,28 @@ void nvmet_file_ns_disable(struct nvmet_ns ns) int nvmet_file_ns_enable(struct nvmet_ns ns) { int flags = O_RDWR \| O_LARGEFILE; + struct path path; int ret = 0; if (!ns->buffered_io) flags \|= O_DIRECT; - ns->file = filp_open(ns->device_path, flags, 0); + ret = kern_path(ns->device_path, LOOKUP_FOLLOW, &path); + if (ret) { + pr_err("failed to open file %s: (%d)\n", + ns->device_path, ret); + return ret; + } + + if (configfs_path_is_configfs(&path)) { + pr_err("configfs paths cannot back namespace %s\n", + ns->device_path); + path_put(&path); + return -EINVAL; + } + + ns->file = file_open_root(&path, "", flags, 0); + path_put(&path); if (IS_ERR(ns->file)) { ret = PTR_ERR(ns->file); pr_err("failed to open file %s: (%d)\n", diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c index fa6527c537e26..aa1778c9ee28d 100644 --- a/drivers/nvme/target/passthru.c +++ b/drivers/nvme/target/passthru.c @@ -9,6 +9,8 @@ / #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> +#include <linux/configfs.h> +#include <linux/namei.h> #include "../host/nvme.h" #include "nvmet.h" @@ -588,6 +590,7 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys) { struct nvme_ctrl ctrl; struct file file; + struct path path; int ret = -EINVAL; void old; @@ -602,7 +605,19 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys) goto out_unlock; } - file = filp_open(subsys->passthru_ctrl_path, O_RDWR, 0); + ret = kern_path(subsys->passthru_ctrl_path, LOOKUP_FOLLOW, &path); + if (ret) + goto out_unlock; + + if (configfs_path_is_configfs(&path)) { + pr_err("configfs paths cannot back passthru controller %s\n", + subsys->passthru_ctrl_path); + path_put(&path); + goto out_unlock; + } + + file = file_open_root(&path, "", O_RDWR, 0); + path_put(&path); if (IS_ERR(file)) { ret = PTR_ERR(file); goto out_unlock; diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c index d8cac1cbf3bd5..8abbe3afaa5eb 100644 --- a/fs/configfs/mount.c +++ b/fs/configfs/mount.c @@ -118,6 +118,12 @@ static struct file_system_type configfs_fs_type = { }; MODULE_ALIAS_FS("configfs"); +bool configfs_path_is_configfs(const struct path path) +{ + return path->dentry->d_sb->s_type == &configfs_fs_type; +} +EXPORT_SYMBOL_GPL(configfs_path_is_configfs); + struct dentry configfs_pin_fs(void) { int err = simple_pin_fs(&configfs_fs_type, &configfs_mount, diff --git a/include/linux/configfs.h b/include/linux/configfs.h index ef65c75beeaad..55df734da634b 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -34,6 +34,7 @@ struct configfs_group_operations; struct configfs_attribute; struct configfs_bin_attribute; struct configfs_subsystem; +struct path; struct config_item { char ci_name; @@ -243,6 +244,7 @@ void configfs_unregister_subsystem(struct configfs_subsystem subsys); int configfs_register_group(struct config_group parent_group, struct config_group group); void configfs_unregister_group(struct config_group group); +bool configfs_path_is_configfs(const struct path path); void configfs_remove_default_groups(struct config_group *group);
3/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 4249 output: 20 thoughts: 785 Thoughts: Analyzing the NVMe Target Patch Okay, so this patch is touching the NVMe target driver (specifically `io-cmd-file.c`) and appears to be adding a check to ensure that the file backing an NVMe namespace isn't a configfs path. My initial reaction is that this is a good thing – we probably don't want NVMe namespaces pointing to configfs objects, it makes sense from a security and usability perspective. The patch introduces `configfs_path_is_configfs` to determine if a path leads into configfs. It then leverages `kern_path` and `file_open_root` in a safer manner as well. Now, my mind shifts to a few key questions as a researcher: 1. Why this change? Is there a known vulnerability or use-case that this is addressing? I need to dig into the commit message and any related bug reports to understand the why behind this fix. Is this related to some security hardening? 2. Implications for Existing Configurations: Will this break any existing configurations? I'll need to consider how this change might impact users who have non-standard setups. Is there an upgrade path described in the documentation? 3. Reachability and Fuzzing: The bigger question for me now is: how easily is this code path triggered? Can this `nvmet` target, especially the file-backed namespace part, be reached and fuzzed through something like syzkaller? I'll need to check if there are nvmet-related Kconfig options that I need to ensure are enabled to trigger this. I'll need to use grepper to see how nvmet target is used in syzkaller tests, and whether the configfs paths can be fuzzed or reached from syzkaller. I'll start by checking the patch's history, then move on to examining the Kconfig options related to NVMe target and syzkaller configurations. I need to understand the attack surface and if this change affects fuzzing, positive or negative.
4/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "CONFIG_NVME_TARGET" } Results: { "Output": "Documentation/ABI/stable/configfs-nvmet=84=Description:\n--\nDocumentation/ABI/stable/configfs-nvmet-86-\t\tTCP transport, accepted values: \"none\", \"tls1.3\" (requires\nDocumentation/ABI/stable/configfs-nvmet:87:\t\tCONFIG_NVME_TARGET_TCP_TLS). For RDMA transport, shows the\nDocumentation/ABI/stable/configfs-nvmet-88-\t\tQP type: \"connected\" or \"datagram\". The port must be\n--\nDocumentation/ABI/stable/configfs-nvmet=233=Description:\n--\nDocumentation/ABI/stable/configfs-nvmet-242-\nDocumentation/ABI/stable/configfs-nvmet:243:\t\tOnly available when CONFIG_NVME_TARGET_PASSTHRU is enabled.\nDocumentation/ABI/stable/configfs-nvmet-244-\n--\nDocumentation/ABI/stable/configfs-nvmet=250=Description:\n--\nDocumentation/ABI/stable/configfs-nvmet-256-\nDocumentation/ABI/stable/configfs-nvmet:257:\t\tOnly available when CONFIG_NVME_TARGET_PASSTHRU is enabled.\nDocumentation/ABI/stable/configfs-nvmet-258-\n--\nDocumentation/ABI/stable/configfs-nvmet=263=Description:\n--\nDocumentation/ABI/stable/configfs-nvmet-265-\t\tpassthrough mode. Only available when\nDocumentation/ABI/stable/configfs-nvmet:266:\t\tCONFIG_NVME_TARGET_PASSTHRU is enabled.\nDocumentation/ABI/stable/configfs-nvmet-267-\n--\nDocumentation/ABI/stable/configfs-nvmet=324=Description:\n--\nDocumentation/ABI/stable/configfs-nvmet-342-\nDocumentation/ABI/stable/configfs-nvmet:343:\t\tOnly available when CONFIG_NVME_TARGET_AUTH is enabled.\nDocumentation/ABI/stable/configfs-nvmet-344-\n--\nDocumentation/nvme/nvme-pci-endpoint-target.rst=144=The kernel must be compiled with the configuration options CONFIG_PCI_ENDPOINT,\nDocumentation/nvme/nvme-pci-endpoint-target.rst:145:CONFIG_PCI_ENDPOINT_CONFIGFS, and CONFIG_NVME_TARGET_PCI_EPF enabled.\nDocumentation/nvme/nvme-pci-endpoint-target.rst:146:CONFIG_PCI, CONFIG_BLK_DEV_NVME and CONFIG_NVME_TARGET must also be enabled\nDocumentation/nvme/nvme-pci-endpoint-target.rst-147-(obviously).\n--\narch/loongarch/configs/loongson32_defconfig=465=CONFIG_NVME_TCP=m\narch/loongarch/configs/loongson32_defconfig:466:CONFIG_NVME_TARGET=m\narch/loongarch/configs/loongson32_defconfig:467:CONFIG_NVME_TARGET_PASSTHRU=y\narch/loongarch/configs/loongson32_defconfig:468:CONFIG_NVME_TARGET_LOOP=m\narch/loongarch/configs/loongson32_defconfig:469:CONFIG_NVME_TARGET_RDMA=m\narch/loongarch/configs/loongson32_defconfig:470:CONFIG_NVME_TARGET_FC=m\narch/loongarch/configs/loongson32_defconfig:471:CONFIG_NVME_TARGET_TCP=m\narch/loongarch/configs/loongson32_defconfig-472-CONFIG_EEPROM_AT24=m\n--\narch/loongarch/configs/loongson64_defconfig=481=CONFIG_NVME_TCP=m\narch/loongarch/configs/loongson64_defconfig:482:CONFIG_NVME_TARGET=m\narch/loongarch/configs/loongson64_defconfig:483:CONFIG_NVME_TARGET_PASSTHRU=y\narch/loongarch/configs/loongson64_defconfig:484:CONFIG_NVME_TARGET_LOOP=m\narch/loongarch/configs/loongson64_defconfig:485:CONFIG_NVME_TARGET_RDMA=m\narch/loongarch/configs/loongson64_defconfig:486:CONFIG_NVME_TARGET_FC=m\narch/loongarch/configs/loongson64_defconfig:487:CONFIG_NVME_TARGET_TCP=m\narch/loongarch/configs/loongson64_defconfig-488-CONFIG_EEPROM_AT24=m\n--\ndrivers/nvme/target/Makefile=3=ccflags-y\t\t\t\t+= -I$(src)\ndrivers/nvme/target/Makefile-4-\ndrivers/nvme/target/Makefile:5:obj-$(CONFIG_NVME_TARGET)\t\t+= nvmet.o\ndrivers/nvme/target/Makefile:6:obj-$(CONFIG_NVME_TARGET_LOOP)\t\t+= nvme-loop.o\ndrivers/nvme/target/Makefile:7:obj-$(CONFIG_NVME_TARGET_RDMA)\t\t+= nvmet-rdma.o\ndrivers/nvme/target/Makefile:8:obj-$(CONFIG_NVME_TARGET_FC)\t\t+= nvmet-fc.o\ndrivers/nvme/target/Makefile:9:obj-$(CONFIG_NVME_TARGET_FCLOOP)\t+= nvme-fcloop.o\ndrivers/nvme/target/Makefile:10:obj-$(CONFIG_NVME_TARGET_TCP)\t\t+= nvmet-tcp.o\ndrivers/nvme/target/Makefile:11:obj-$(CONFIG_NVME_TARGET_PCI_EPF)\t+= nvmet-pci-epf.o\ndrivers/nvme/target/Makefile-12-\ndrivers/nvme/target/Makefile=13=nvmet-y\t\t+= core.o configfs.o admin-cmd.o fabrics-cmd.o \\\ndrivers/nvme/target/Makefile-14-\t\t\tdiscovery.o io-cmd-file.o io-cmd-bdev.o pr.o\ndrivers/nvme/target/Makefile:15:nvmet-$(CONFIG_NVME_TARGET_DEBUGFS)\t+= debugfs.o\ndrivers/nvme/target/Makefile:16:nvmet-$(CONFIG_NVME_TARGET_PASSTHRU)\t+= passthru.o\ndrivers/nvme/target/Makefile-17-nvmet-$(CONFIG_BLK_DEV_ZONED)\t\t+= zns.o\ndrivers/nvme/target/Makefile:18:nvmet-$(CONFIG_NVME_TARGET_AUTH)\t+= fabrics-cmd-auth.o auth.o\ndrivers/nvme/target/Makefile-19-nvme-loop-y\t+= loop.o\n--\ndrivers/nvme/target/auth.c=133=u8 nvmet_setup_auth(struct nvmet_ctrl ctrl, struct nvmet_sq sq, bool reset)\n--\ndrivers/nvme/target/auth.c-190-\t}\ndrivers/nvme/target/auth.c:191:#ifdef CONFIG_NVME_TARGET_AUTH_DEBUG\ndrivers/nvme/target/auth.c-192-\tpr_debug(\"%s: using hash %s key %ph\\n\", __func__,\n--\ndrivers/nvme/target/auth.c-209-\t}\ndrivers/nvme/target/auth.c:210:#ifdef CONFIG_NVME_TARGET_AUTH_DEBUG\ndrivers/nvme/target/auth.c-211-\tpr_debug(\"%s: using ctrl hash %s key %ph\\n\", __func__,\n--\ndrivers/nvme/target/auth.c=247=void nvmet_destroy_auth(struct nvmet_ctrl ctrl)\n--\ndrivers/nvme/target/auth.c-266-\t}\ndrivers/nvme/target/auth.c:267:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/auth.c-268-\tif (ctrl-\u003etls_key) {\n--\ndrivers/nvme/target/auth.c=427=int nvmet_auth_ctrl_exponential(struct nvmet_req req,\n--\ndrivers/nvme/target/auth.c-442-\t\tmemcpy(buf, ctrl-\u003edh_key, buf_size);\ndrivers/nvme/target/auth.c:443:#ifdef CONFIG_NVME_TARGET_AUTH_DEBUG\ndrivers/nvme/target/auth.c-444-\t\tpr_debug(\"%s: ctrl %d public key %ph\\n\", __func__,\n--\ndrivers/nvme/target/auth.c=452=int nvmet_auth_ctrl_sesskey(struct nvmet_req req,\n--\ndrivers/nvme/target/auth.c-468-\t\tpr_debug(\"failed to compute session key, err %d\\n\", ret);\ndrivers/nvme/target/auth.c:469:#ifdef CONFIG_NVME_TARGET_AUTH_DEBUG\ndrivers/nvme/target/auth.c-470-\telse\n--\ndrivers/nvme/target/auth.c=478=void nvmet_auth_insert_psk(struct nvmet_sq sq)\n--\ndrivers/nvme/target/auth.c-484-\tint ret;\ndrivers/nvme/target/auth.c:485:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/auth.c-486-\tstruct key tls_key = NULL;\n--\ndrivers/nvme/target/auth.c-513-\t}\ndrivers/nvme/target/auth.c:514:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/auth.c-515-\ttls_key = nvme_tls_psk_refresh(NULL, sq-\u003ectrl-\u003ehostnqn,\n--\ndrivers/nvme/target/configfs.c-15-#include \u003clinux/pci-p2pdma.h\u003e\ndrivers/nvme/target/configfs.c:16:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/configfs.c-17-#include \u003clinux/nvme-auth.h\u003e\n--\ndrivers/nvme/target/configfs.c=467=static ssize_t nvmet_addr_tsas_store(struct config_item item,\n--\ndrivers/nvme/target/configfs.c-491-\tif (sectype == NVMF_TCP_SECTYPE_TLS13) {\ndrivers/nvme/target/configfs.c:492:\t\tif (!IS_ENABLED(CONFIG_NVME_TARGET_TCP_TLS)) {\ndrivers/nvme/target/configfs.c-493-\t\t\tpr_err(\"TLS is not supported\\n\");\n--\ndrivers/nvme/target/configfs.c=894=static const struct config_item_type nvmet_namespaces_type = {\n--\ndrivers/nvme/target/configfs.c-898-\ndrivers/nvme/target/configfs.c:899:#ifdef CONFIG_NVME_TARGET_PASSTHRU\ndrivers/nvme/target/configfs.c-900-\n--\ndrivers/nvme/target/configfs.c=1040=static void nvmet_add_passthru_group(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/configfs.c-1047-\ndrivers/nvme/target/configfs.c:1048:#else /* CONFIG_NVME_TARGET_PASSTHRU /\ndrivers/nvme/target/configfs.c-1049-\ndrivers/nvme/target/configfs.c=1050=static void nvmet_add_passthru_group(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/configfs.c-1053-\ndrivers/nvme/target/configfs.c:1054:#endif /* CONFIG_NVME_TARGET_PASSTHRU /\ndrivers/nvme/target/configfs.c-1055-\n--\ndrivers/nvme/target/configfs.c=2041=static struct config_group nvmet_ports_make(struct config_group group,\n--\ndrivers/nvme/target/configfs.c-2054-\ndrivers/nvme/target/configfs.c:2055:\tif (IS_ENABLED(CONFIG_NVME_TARGET_TCP_TLS) \u0026\u0026 nvme_keyring_id()) {\ndrivers/nvme/target/configfs.c-2056-\t\tport-\u003ekeyring = key_lookup(nvme_keyring_id());\n--\ndrivers/nvme/target/configfs.c=2118=static struct config_group nvmet_ports_group;\ndrivers/nvme/target/configfs.c-2119-\ndrivers/nvme/target/configfs.c:2120:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/configfs.c-2121-static ssize_t nvmet_host_dhchap_key_show(struct config_item item,\n--\ndrivers/nvme/target/configfs.c=2241=static struct configfs_attribute nvmet_host_attrs[] = {\n--\ndrivers/nvme/target/configfs.c-2247-};\ndrivers/nvme/target/configfs.c:2248:#endif / CONFIG_NVME_TARGET_AUTH /\ndrivers/nvme/target/configfs.c-2249-\ndrivers/nvme/target/configfs.c=2250=static void nvmet_host_release(struct config_item item)\n--\ndrivers/nvme/target/configfs.c-2253-\ndrivers/nvme/target/configfs.c:2254:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/configfs.c-2255-\tkfree(host-\u003edhchap_secret);\n--\ndrivers/nvme/target/configfs.c=2265=static const struct config_item_type nvmet_host_type = {\ndrivers/nvme/target/configfs.c-2266-\t.ct_item_ops\t\t= \u0026nvmet_host_item_ops,\ndrivers/nvme/target/configfs.c:2267:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/configfs.c-2268-\t.ct_attrs\t\t= nvmet_host_attrs,\n--\ndrivers/nvme/target/configfs.c=2273=static struct config_group nvmet_hosts_make_group(struct config_group group,\n--\ndrivers/nvme/target/configfs.c-2281-\ndrivers/nvme/target/configfs.c:2282:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/configfs.c-2283-\t/* Default to SHA256 /\n--\ndrivers/nvme/target/core.c=1599=struct nvmet_ctrl nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args args)\n--\ndrivers/nvme/target/core.c-1637-\ndrivers/nvme/target/core.c:1638:#ifdef CONFIG_NVME_TARGET_PASSTHRU\ndrivers/nvme/target/core.c-1639-\t/ By default, set loop targets to clear IDS by default /\n--\ndrivers/nvme/target/debugfs.c=133=NVMET_DEBUGFS_ATTR(nvmet_ctrl_host_traddr);\ndrivers/nvme/target/debugfs.c-134-\ndrivers/nvme/target/debugfs.c:135:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/debugfs.c-136-static int nvmet_ctrl_tls_key_show(struct seq_file m, void p)\n--\ndrivers/nvme/target/debugfs.c=259=int nvmet_debugfs_ctrl_setup(struct nvmet_ctrl ctrl)\n--\ndrivers/nvme/target/debugfs.c-283-\t\t\t \u0026nvmet_ctrl_host_traddr_fops);\ndrivers/nvme/target/debugfs.c:284:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/debugfs.c-285-\tdebugfs_create_file(\"tls_concat\", S_IRUSR, ctrl-\u003edebugfs_dir, ctrl,\n--\ndrivers/nvme/target/debugfs.h-11-\ndrivers/nvme/target/debugfs.h:12:#ifdef CONFIG_NVME_TARGET_DEBUGFS\ndrivers/nvme/target/debugfs.h-13-int nvmet_debugfs_subsys_setup(struct nvmet_subsys subsys);\n--\ndrivers/nvme/target/fabrics-cmd-auth.c=34=static u8 nvmet_auth_negotiate(struct nvmet_req req, void d, u32 tl)\n--\ndrivers/nvme/target/fabrics-cmd-auth.c-51-\tif (data-\u003esc_c != NVME_AUTH_SECP_NOSC) {\ndrivers/nvme/target/fabrics-cmd-auth.c:52:\t\tif (!IS_ENABLED(CONFIG_NVME_TARGET_TCP_TLS))\ndrivers/nvme/target/fabrics-cmd-auth.c-53-\t\t\treturn NVME_AUTH_DHCHAP_FAILURE_CONCAT_MISMATCH;\n--\ndrivers/nvme/target/fabrics-cmd.c=88=u32 nvmet_fabrics_admin_cmd_data_len(struct nvmet_req req)\n--\ndrivers/nvme/target/fabrics-cmd.c-92-\tswitch (cmd-\u003efabrics.fctype) {\ndrivers/nvme/target/fabrics-cmd.c:93:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/fabrics-cmd.c-94-\tcase nvme_fabrics_type_auth_send:\n--\ndrivers/nvme/target/fabrics-cmd.c=104=u16 nvmet_parse_fabrics_admin_cmd(struct nvmet_req req)\n--\ndrivers/nvme/target/fabrics-cmd.c-114-\t\tbreak;\ndrivers/nvme/target/fabrics-cmd.c:115:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/fabrics-cmd.c-116-\tcase nvme_fabrics_type_auth_send:\n--\ndrivers/nvme/target/fabrics-cmd.c=133=u32 nvmet_fabrics_io_cmd_data_len(struct nvmet_req req)\n--\ndrivers/nvme/target/fabrics-cmd.c-137-\tswitch (cmd-\u003efabrics.fctype) {\ndrivers/nvme/target/fabrics-cmd.c:138:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/fabrics-cmd.c-139-\tcase nvme_fabrics_type_auth_send:\n--\ndrivers/nvme/target/fabrics-cmd.c=149=u16 nvmet_parse_fabrics_io_cmd(struct nvmet_req req)\n--\ndrivers/nvme/target/fabrics-cmd.c-153-\tswitch (cmd-\u003efabrics.fctype) {\ndrivers/nvme/target/fabrics-cmd.c:154:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/fabrics-cmd.c-155-\tcase nvme_fabrics_type_auth_send:\n--\ndrivers/nvme/target/nvmet.h=100=struct nvmet_ns {\n--\ndrivers/nvme/target/nvmet.h-130-\tstruct xarray\t\tpr_per_ctrl_refs;\ndrivers/nvme/target/nvmet.h:131:#ifdef CONFIG_NVME_TARGET_DEBUGFS\ndrivers/nvme/target/nvmet.h-132-\tstruct dentry\t\tdebugfs_dir;\n--\ndrivers/nvme/target/nvmet.h=153=struct nvmet_sq {\n--\ndrivers/nvme/target/nvmet.h-160-\tbool\t\t\tsqhd_disabled;\ndrivers/nvme/target/nvmet.h:161:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/nvmet.h-162-\tbool\t\t\tauthenticated;\n--\ndrivers/nvme/target/nvmet.h-174-#endif\ndrivers/nvme/target/nvmet.h:175:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/nvmet.h-176-\tstruct key\t\ttls_key;\n--\ndrivers/nvme/target/nvmet.h=255=struct nvmet_ctrl {\n--\ndrivers/nvme/target/nvmet.h-296-\tstruct radix_tree_root\tp2p_ns_map;\ndrivers/nvme/target/nvmet.h:297:#ifdef CONFIG_NVME_TARGET_DEBUGFS\ndrivers/nvme/target/nvmet.h-298-\tstruct dentry\t\tdebugfs_dir;\n--\ndrivers/nvme/target/nvmet.h-304-\tbool\t\t\tconcat;\ndrivers/nvme/target/nvmet.h:305:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/nvmet.h-306-\tstruct nvme_dhchap_key\thost_key;\n--\ndrivers/nvme/target/nvmet.h-313-#endif\ndrivers/nvme/target/nvmet.h:314:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/nvmet.h-315-\tstruct key\t\ttls_key;\n--\ndrivers/nvme/target/nvmet.h=320=struct nvmet_subsys {\n--\ndrivers/nvme/target/nvmet.h-335-\tbool\t\t\tallow_any_host;\ndrivers/nvme/target/nvmet.h:336:#ifdef CONFIG_NVME_TARGET_DEBUGFS\ndrivers/nvme/target/nvmet.h-337-\tstruct dentry\t\tdebugfs_dir;\n--\ndrivers/nvme/target/nvmet.h-357-\ndrivers/nvme/target/nvmet.h:358:#ifdef CONFIG_NVME_TARGET_PASSTHRU\ndrivers/nvme/target/nvmet.h-359-\tstruct nvme_ctrl\tpassthru_ctrl;\n--\ndrivers/nvme/target/nvmet.h-364-\tunsigned int\t\tclear_ids;\ndrivers/nvme/target/nvmet.h:365:#endif /* CONFIG_NVME_TARGET_PASSTHRU /\ndrivers/nvme/target/nvmet.h-366-\n--\ndrivers/nvme/target/nvmet.h=776=static inline u8 nvmet_ctrl_mdts(struct nvmet_req req)\n--\ndrivers/nvme/target/nvmet.h-785-\ndrivers/nvme/target/nvmet.h:786:#ifdef CONFIG_NVME_TARGET_PASSTHRU\ndrivers/nvme/target/nvmet.h-787-void nvmet_passthru_subsys_free(struct nvmet_subsys subsys);\n--\ndrivers/nvme/target/nvmet.h=792=static inline bool nvmet_is_passthru_subsys(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/nvmet.h-795-}\ndrivers/nvme/target/nvmet.h:796:#else /* CONFIG_NVME_TARGET_PASSTHRU /\ndrivers/nvme/target/nvmet.h-797-static inline void nvmet_passthru_subsys_free(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/nvmet.h=811=static inline bool nvmet_is_passthru_subsys(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/nvmet.h-814-}\ndrivers/nvme/target/nvmet.h:815:#endif / CONFIG_NVME_TARGET_PASSTHRU /\ndrivers/nvme/target/nvmet.h-816-\n--\ndrivers/nvme/target/nvmet.h=891=static inline void nvmet_req_bio_put(struct nvmet_req req, struct bio bio)\n--\ndrivers/nvme/target/nvmet.h-898-\ndrivers/nvme/target/nvmet.h:899:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/nvmet.h-900-static inline key_serial_t nvmet_queue_tls_keyid(struct nvmet_sq sq)\n--\ndrivers/nvme/target/nvmet.h=913=static inline void nvmet_sq_put_tls_key(struct nvmet_sq sq) {}\ndrivers/nvme/target/nvmet.h-914-#endif\ndrivers/nvme/target/nvmet.h:915:#ifdef CONFIG_NVME_TARGET_AUTH\ndrivers/nvme/target/nvmet.h-916-u32 nvmet_auth_send_data_len(struct nvmet_req req);\n--\ndrivers/nvme/target/tcp.c=72=MODULE_PARM_DESC(idle_poll_period_usecs,\n--\ndrivers/nvme/target/tcp.c-74-\ndrivers/nvme/target/tcp.c:75:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/tcp.c-76-/\n--\ndrivers/nvme/target/tcp.c=1724=static int nvmet_tcp_set_queue_sock(struct nvmet_tcp_queue queue)\n--\ndrivers/nvme/target/tcp.c-1778-\ndrivers/nvme/target/tcp.c:1779:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/tcp.c-1780-static int nvmet_tcp_try_peek_pdu(struct nvmet_tcp_queue queue)\n--\ndrivers/nvme/target/tcp.c=1936=static void nvmet_tcp_alloc_queue(struct nvmet_tcp_port port,\n--\ndrivers/nvme/target/tcp.c-1993-\t\t\t nvmet_tcp_tls_handshake_timeout);\ndrivers/nvme/target/tcp.c:1994:#ifdef CONFIG_NVME_TARGET_TCP_TLS\ndrivers/nvme/target/tcp.c-1995-\tif (queue-\u003estate == NVMET_TCP_Q_TLS_HANDSHAKE) {\n--\ndrivers/scsi/lpfc/lpfc_init.c=7919=lpfc_sli4_driver_resource_setup(struct lpfc_hba phba)\n--\ndrivers/scsi/lpfc/lpfc_init.c-8145-\t\t\tif (wwn == lpfc_enable_nvmet[i]) {\ndrivers/scsi/lpfc/lpfc_init.c:8146:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_init.c-8147-\t\t\t\tif (lpfc_nvmet_mem_alloc(phba))\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=78=lpfc_nvmet_cmd_template(void)\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-207-\ndrivers/scsi/lpfc/lpfc_nvmet.c:208:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-209-static struct lpfc_async_xchg_ctx \n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=379=lpfc_nvmet_ctxbuf_post(struct lpfc_hba phba, struct lpfc_nvmet_ctxbuf ctx_buf)\ndrivers/scsi/lpfc/lpfc_nvmet.c-380-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:381:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-382-\tstruct lpfc_async_xchg_ctx ctxp = ctx_buf-\u003econtext;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=1644=lpfc_nvmet_create_targetport(struct lpfc_hba phba)\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-1670-\ndrivers/scsi/lpfc/lpfc_nvmet.c:1671:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-1672-\terror = nvmet_fc_register_targetport(\u0026pinfo, \u0026lpfc_tgttemplate,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=1769=lpfc_sli4_nvmet_xri_aborted(struct lpfc_hba phba,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-1771-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:1772:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-1773-\tuint16_t xri = bf_get(lpfc_wcqe_xa_xri, axri);\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=1871=lpfc_nvmet_rcv_unsol_abort(struct lpfc_vport vport,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-1873-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:1874:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-1875-\tstruct lpfc_hba phba = vport-\u003ephba;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2055=lpfc_nvmet_wqfull_process(struct lpfc_hba phba,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-2057-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:2058:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2059-\tstruct lpfc_sli_ring pring;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2104=lpfc_nvmet_destroy_targetport(struct lpfc_hba phba)\ndrivers/scsi/lpfc/lpfc_nvmet.c-2105-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:2106:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2107-\tstruct lpfc_nvmet_tgtport tgtp;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2150=lpfc_nvmet_handle_lsreq(struct lpfc_hba phba,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-2152-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:2153:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2154-\tstruct lpfc_nvmet_tgtport tgtp = phba-\u003etargetport-\u003eprivate;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2185=lpfc_nvmet_process_rcv_fcp_req(struct lpfc_nvmet_ctxbuf ctx_buf)\ndrivers/scsi/lpfc/lpfc_nvmet.c-2186-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:2187:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2188-\tstruct lpfc_async_xchg_ctx ctxp = ctx_buf-\u003econtext;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2290=lpfc_nvmet_fcp_rqst_defer_work(struct work_struct work)\ndrivers/scsi/lpfc/lpfc_nvmet.c-2291-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:2292:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2293-\tstruct lpfc_nvmet_ctxbuf ctx_buf =\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2301=lpfc_nvmet_replenish_context(struct lpfc_hba phba,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-2303-{\ndrivers/scsi/lpfc/lpfc_nvmet.c:2304:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2305-\tstruct lpfc_nvmet_ctxbuf ctx_buf = NULL;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=2373=lpfc_nvmet_unsol_fcp_buffer(struct lpfc_hba phba,\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-2387-\ndrivers/scsi/lpfc/lpfc_nvmet.c:2388:\tif (!IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-2389-\t\treturn;\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c=3594=lpfc_nvmet_invalidate_host(struct lpfc_hba phba, struct lpfc_nodelist ndlp)\n--\ndrivers/scsi/lpfc/lpfc_nvmet.c-3622-\ndrivers/scsi/lpfc/lpfc_nvmet.c:3623:#if (IS_ENABLED(CONFIG_NVME_TARGET_FC))\ndrivers/scsi/lpfc/lpfc_nvmet.c-3624-\t/* Need to get the nvmet_fc_target_port pointer here.*/\n" }
5/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 14289 output: 35 thoughts: 17 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Diving into the NVMe Target Kconfig Alright, let's get down to brass tacks. I need to understand the configuration options for the NVMe target driver. Specifically, I'm digging into `drivers/nvme/target/Kconfig`. I'm going to start with a comprehensive review of this file. My plan is to see how the various features and functionalities of the NVMe target are exposed to the user and the kernel build system.
6/2	2026/09/16 02:41	tool	read-file	0m Args: { "File": "drivers/nvme/target/Kconfig", "FirstLine": 1, "LineCount": 80 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\t\n 3:\tconfig NVME_TARGET\n 4:\t\ttristate \"NVMe Target support\"\n 5:\t\tdepends on BLOCK\n 6:\t\tselect CONFIGFS_FS\n 7:\t\tselect NVME_KEYRING if NVME_TARGET_TCP_TLS\n 8:\t\tselect KEYS if NVME_TARGET_TCP_TLS\n 9:\t\tselect SGL_ALLOC\n 10:\t\thelp\n 11:\t\t This enabled target side support for the NVMe protocol, that is\n 12:\t\t it allows the Linux kernel to implement NVMe subsystems and\n 13:\t\t controllers and export Linux block devices as NVMe namespaces.\n 14:\t\t You need to select at least one of the transports below to make this\n 15:\t\t functionality useful.\n 16:\t\n 17:\t\t To configure the NVMe target you probably want to use the nvmetcli\n 18:\t\t tool from http://git.infradead.org/users/hch/nvmetcli.git.\n 19:\t\n 20:\tconfig NVME_TARGET_DEBUGFS\n 21:\t bool \"NVMe Target debugfs support\"\n 22:\t\tdepends on NVME_TARGET\n 23:\t\thelp\n 24:\t\t This enables debugfs support to display the connected controllers\n 25:\t\t to each subsystem\n 26:\t\n 27:\t\t If unsure, say N.\n 28:\t\n 29:\tconfig NVME_TARGET_PASSTHRU\n 30:\t\tbool \"NVMe Target Passthrough support\"\n 31:\t\tdepends on NVME_TARGET\n 32:\t\tdepends on NVME_CORE=y \|\| NVME_CORE=NVME_TARGET\n 33:\t\thelp\n 34:\t\t This enables target side NVMe passthru controller support for the\n 35:\t\t NVMe Over Fabrics protocol. It allows for hosts to manage and\n 36:\t\t directly access an actual NVMe controller residing on the target\n 37:\t\t side, including executing Vendor Unique Commands.\n 38:\t\n 39:\t\t If unsure, say N.\n 40:\t\n 41:\tconfig NVME_TARGET_LOOP\n 42:\t\ttristate \"NVMe loopback device support\"\n 43:\t\tdepends on NVME_TARGET\n 44:\t\tselect NVME_FABRICS\n 45:\t\tselect SG_POOL\n 46:\t\thelp\n 47:\t\t This enables the NVMe loopback device support, which can be useful\n 48:\t\t to test NVMe host and target side features.\n 49:\t\n 50:\t\t If unsure, say N.\n 51:\t\n 52:\tconfig NVME_TARGET_RDMA\n 53:\t\ttristate \"NVMe over Fabrics RDMA target support\"\n 54:\t\tdepends on INFINIBAND \u0026\u0026 INFINIBAND_ADDR_TRANS\n 55:\t\tdepends on NVME_TARGET\n 56:\t\tselect SGL_ALLOC\n 57:\t\thelp\n 58:\t\t This enables the NVMe RDMA target support, which allows exporting NVMe\n 59:\t\t devices over RDMA.\n 60:\t\n 61:\t\t If unsure, say N.\n 62:\t\n 63:\tconfig NVME_TARGET_FC\n 64:\t\ttristate \"NVMe over Fabrics FC target driver\"\n 65:\t\tdepends on NVME_TARGET\n 66:\t\tdepends on HAS_DMA\n 67:\t\tselect SGL_ALLOC\n 68:\t\thelp\n 69:\t\t This enables the NVMe FC target support, which allows exporting NVMe\n 70:\t\t devices over FC.\n 71:\t\n 72:\t\t If unsure, say N.\n 73:\t\n 74:\tconfig NVME_TARGET_FCLOOP\n 75:\t\ttristate \"NVMe over Fabrics FC Transport Loopback Test driver\"\n 76:\t\tdepends on NVME_TARGET\n 77:\t\tselect NVME_FABRICS\n 78:\t\tselect SG_POOL\n 79:\t\tdepends on NVME_FC\n 80:\t\tdepends on NVME_TARGET_FC\n" }
7/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 15514 output: 36 thoughts: 18 Thoughts: Here's my take on the contents of `drivers/nvme/target/Kconfig`, as if I were processing it: Digging into the NVMe Target Configuration Okay, so I'm diving into the Kconfig for the NVMe target driver. Time to see what features we can enable and disable. I expect a good bit of granularity here, given the complexity of NVMe and the various target controller implementations out there. I'm looking for options related to namespaces, admin commands, data protection, perhaps even specific controller models if they have notable quirks. And of course, the general enabling/disabling of the target itself. I'm also anticipating options for debugging and logging levels. I'll be looking to see how they've structured the dependencies; any clear groupings by functionality are a bonus. Hopefully, it's well-organized and doesn't make me hunt all over the place to understand the configuration options. Right, let's get to it. Time to see what secrets this configuration file holds.
8/2	2026/09/16 02:41	tool	read-file	0m Args: { "File": "drivers/nvme/target/Kconfig", "FirstLine": 81, "LineCount": 50 } Results: { "Contents": " 81:\t\thelp\n 82:\t\t This enables the NVMe FC loopback test support, which can be useful\n 83:\t\t to test NVMe-FC transport interfaces.\n 84:\t\n 85:\t\t If unsure, say N.\n 86:\t\n 87:\tconfig NVME_TARGET_TCP\n 88:\t\ttristate \"NVMe over Fabrics TCP target support\"\n 89:\t\tdepends on INET\n 90:\t\tdepends on NVME_TARGET\n 91:\t\thelp\n 92:\t\t This enables the NVMe TCP target support, which allows exporting NVMe\n 93:\t\t devices over TCP.\n 94:\t\n 95:\t\t If unsure, say N.\n 96:\t\n 97:\tconfig NVME_TARGET_TCP_TLS\n 98:\t\tbool \"NVMe over Fabrics TCP target TLS encryption support\"\n 99:\t\tdepends on NVME_TARGET_TCP\n 100:\t\tselect NET_HANDSHAKE\n 101:\t\tselect TLS\n 102:\t\thelp\n 103:\t\t Enables TLS encryption for the NVMe TCP target using the netlink handshake API.\n 104:\t\n 105:\t\t The TLS handshake daemon is available at\n 106:\t\t https://github.com/oracle/ktls-utils.\n 107:\t\n 108:\t\t If unsure, say N.\n 109:\t\n 110:\tconfig NVME_TARGET_AUTH\n 111:\t\tbool \"NVMe over Fabrics In-band Authentication in target side\"\n 112:\t\tdepends on NVME_TARGET\n 113:\t\tselect NVME_AUTH\n 114:\t\thelp\n 115:\t\t This enables support for NVMe over Fabrics In-band Authentication in\n 116:\t\t target side.\n 117:\t\n 118:\t\t If unsure, say N.\n 119:\t\n 120:\tconfig NVME_TARGET_AUTH_DEBUG\n 121:\t\tbool \"NVMe over Fabrics In-band Authentication debug messages\"\n 122:\t\tdepends on NVME_TARGET_AUTH\n 123:\t\thelp\n 124:\t\t This enables additional debug messages including the generated\n 125:\t\t DH-HMAC-CHAP secrets to help debugging authentication failures.\n 126:\t\n 127:\t\t If unsure, say N.\n 128:\t\n 129:\tconfig NVME_TARGET_PCI_EPF\n 130:\t\ttristate \"NVMe PCI Endpoint Function target support\"\n" }
9/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 16444 output: 22 thoughts: 63 Thoughts: Okay, let's dive into this. I need to understand the call flow here, specifically how `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` are actually used. I need to see how they're invoked within the broader system. Tracing the Execution Path My immediate next step is to locate all the places where these functions are called. I need to know the context, the arguments being passed, and the overall execution path that leads to their being invoked. This is crucial for understanding their role in the bigger picture, and any possible implications of their behavior. Time to fire up the search tools and identify the callers for both `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable`. Let's get to it!
10/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "nvmet_file_ns_enable" } Results: { "Output": "drivers/nvme/target/core.c=577=int nvmet_ns_enable(struct nvmet_ns ns)\n--\ndrivers/nvme/target/core.c-600-\tif (ret == -ENOTBLK)\ndrivers/nvme/target/core.c:601:\t\tret = nvmet_file_ns_enable(ns);\ndrivers/nvme/target/core.c-602-\tif (ret)\n--\ndrivers/nvme/target/io-cmd-file.c=23=void nvmet_file_ns_disable(struct nvmet_ns ns)\n--\ndrivers/nvme/target/io-cmd-file.c-34-\ndrivers/nvme/target/io-cmd-file.c:35:int nvmet_file_ns_enable(struct nvmet_ns ns)\ndrivers/nvme/target/io-cmd-file.c-36-{\n--\ndrivers/nvme/target/nvmet.h=716=int nvmet_bdev_ns_enable(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h:717:int nvmet_file_ns_enable(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h-718-void nvmet_bdev_ns_disable(struct nvmet_ns ns);\n" }
11/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 17052 output: 20 thoughts: 14 Thoughts: Okay, let's dive into this. Here's my take on those thoughts, as if they're my own: Analyzing `nvmet_ns_enable` Callers Alright, so the task at hand is to investigate who calls the `nvmet_ns_enable` function. This is a critical piece of the NVMe subsystem, so understanding its usage is paramount. My initial instinct is to track down all the call sites to this function. I need to understand the context in which namespace enabling happens. What triggers it? What conditions need to be met? Are there any potential concurrency issues I should be aware of, given that this likely involves modifying shared data structures? I need to look at both the straightforward direct calls and also consider any indirect calls through function pointers or macros. Understanding the control flow around these calls is going to be key to debugging, optimizing, and potentially hardening the code. Let's get to it.
12/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "nvmet_ns_enable" } Results: { "Output": "drivers/nvme/target/configfs.c=712=CONFIGFS_ATTR(nvmet_ns_, ana_grpid);\ndrivers/nvme/target/configfs.c-713-\ndrivers/nvme/target/configfs.c:714:static ssize_t nvmet_ns_enable_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-715-{\n--\ndrivers/nvme/target/configfs.c-718-\ndrivers/nvme/target/configfs.c:719:static ssize_t nvmet_ns_enable_store(struct config_item item,\ndrivers/nvme/target/configfs.c-720-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-736-\tif (enable)\ndrivers/nvme/target/configfs.c:737:\t\tret = nvmet_ns_enable(ns);\ndrivers/nvme/target/configfs.c-738-\telse\n--\ndrivers/nvme/target/core.c=565=bool nvmet_ns_revalidate(struct nvmet_ns ns)\n--\ndrivers/nvme/target/core.c-576-\ndrivers/nvme/target/core.c:577:int nvmet_ns_enable(struct nvmet_ns ns)\ndrivers/nvme/target/core.c-578-{\n--\ndrivers/nvme/target/nvmet.h=638=void nvmet_put_namespace(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h:639:int nvmet_ns_enable(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h-640-void nvmet_ns_disable(struct nvmet_ns ns);\n--\ndrivers/nvme/target/pr.c=1063=int nvmet_ctrl_init_pr(struct nvmet_ctrl ctrl)\n--\ndrivers/nvme/target/pr.c-1078-\t * we can make sure that ns is not enabled, and not call\ndrivers/nvme/target/pr.c:1079:\t * nvmet_pr_init_ns(), see more details in nvmet_ns_enable().\ndrivers/nvme/target/pr.c-1080-\t * So just check ns-\u003epr.enable.\n" }
13/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 17896 output: 24 thoughts: 78 Thoughts: Here's my take on those thoughts: Analyzing the NVMe-over-Fabrics Namespace Enablement Okay, so `nvmet_ns_enable_store` is definitely tied into ConfigFS, which makes sense for the subsystem configuration. That means that when a user writes to the `/sys/kernel/config/nvmet/subsystems/<subsys>/namespaces/<ns>/enable` attribute, the code path eventually leads to a call to `nvmet_ns_enable(ns)`. Classic. Now, the real question is, what happens after that point? I want to see what happens when the namespace is enabled, specifically, I want to see what `nvmet_passthru_ctrl_enable` does. I will check the call graph to this function, to understand how the pass-through controller is affected in the process.
14/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "nvmet_passthru_ctrl_enable" } Results: { "Output": "drivers/nvme/target/configfs.c=950=static ssize_t nvmet_passthru_enable_store(struct config_item item,\n--\ndrivers/nvme/target/configfs.c-960-\tif (enable)\ndrivers/nvme/target/configfs.c:961:\t\tret = nvmet_passthru_ctrl_enable(subsys);\ndrivers/nvme/target/configfs.c-962-\telse\n--\ndrivers/nvme/target/nvmet.h=787=void nvmet_passthru_subsys_free(struct nvmet_subsys subsys);\ndrivers/nvme/target/nvmet.h:788:int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys);\ndrivers/nvme/target/nvmet.h-789-void nvmet_passthru_ctrl_disable(struct nvmet_subsys subsys);\n--\ndrivers/nvme/target/passthru.c=501=u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req req)\n--\ndrivers/nvme/target/passthru.c-588-\ndrivers/nvme/target/passthru.c:589:int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys)\ndrivers/nvme/target/passthru.c-590-{\n" }
15/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18550 output: 23 thoughts: 55 Thoughts: Here's my summary, as though I'm thinking through this process: Diving into This ConfigFS Interaction Okay, so `nvmet_passthru_enable_store` is writing something to the `nvmet_passthru_enable_store` file within configfs. Right, that's the immediate action. But why? Why did someone introduce this specific change? I need to understand the rationale behind this commit. Let's see... the first thing I'll do is immediately fire up `git log`. I'll search for this exact commit hash, of course, to see the commit message and get the complete picture. But, just in case there's something slightly similar that has relevance here, I'll also do a fuzzy search of the repo for related commits. This should give me the broader context. Understanding the purpose of this write operation is critical to assessing its overall impact. I need to see what prompted this configuration change.
16/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "configfs_path_is_configfs" } Results: { "Output": "drivers/nvme/target/io-cmd-file.c=35=int nvmet_file_ns_enable(struct nvmet_ns ns)\n--\ndrivers/nvme/target/io-cmd-file.c-50-\ndrivers/nvme/target/io-cmd-file.c:51:\tif (configfs_path_is_configfs(\u0026path)) {\ndrivers/nvme/target/io-cmd-file.c-52-\t\tpr_err(\"configfs paths cannot back namespace %s\\n\",\n--\ndrivers/nvme/target/passthru.c=589=int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/passthru.c-611-\ndrivers/nvme/target/passthru.c:612:\tif (configfs_path_is_configfs(\u0026path)) {\ndrivers/nvme/target/passthru.c-613-\t\tpr_err(\"configfs paths cannot back passthru controller %s\\n\",\n--\nfs/configfs/mount.c=119=MODULE_ALIAS_FS(\"configfs\");\nfs/configfs/mount.c-120-\nfs/configfs/mount.c:121:bool configfs_path_is_configfs(const struct path path)\nfs/configfs/mount.c-122-{\n--\nfs/configfs/mount.c-124-}\nfs/configfs/mount.c:125:EXPORT_SYMBOL_GPL(configfs_path_is_configfs);\nfs/configfs/mount.c-126-\n--\ninclude/linux/configfs.h=246=void configfs_unregister_group(struct config_group group);\ninclude/linux/configfs.h:247:bool configfs_path_is_configfs(const struct path *path);\ninclude/linux/configfs.h-248-\n" }
17/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 19327 output: 19 thoughts: 837 Thoughts: Analyzing Potential ConfigFS Path Issues in NVMe Target Code Okay, so I'm thinking through a potential vulnerability here. What happens if someone tries to get clever and points the `device_path` or `passthru_ctrl_path` to a ConfigFS path? That could open a whole can of worms with deadlocks or invariant violations, especially when enabling the namespace or passthru controller. We're talking about reading or writing to ConfigFS files while those controllers are active. That sounds like a recipe for trouble. Let me take a look at the `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` functions. I really need to examine the diff closely to understand what's changed in the driver's code: ```diff diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c index 0b22d183f9279..fbe58aa4a85ac 100644 --- a/drivers/nvme/target/io-cmd-file.c +++ b/drivers/nvme/target/io-cmd-file.c @@ -8,7 +8,9 @@ #include <linux/uio.h> #include <linux/falloc.h> #include <linux/file.h> +#include <linux/configfs.h> #include <linux/fs.h> +#include <linux/namei.h> #include "nvmet.h" #define NVMET_MIN_MPOOL_OBJ 16 @@ -33,12 +35,28 @@ void nvmet_file_ns_disable(struct nvmet_ns ns) int nvmet_file_ns_enable(struct nvmet_ns ns) { int flags = O_RDWR \| O_LARGEFILE; + struct path path; int ret = 0; if (!ns->buffered_io) flags \|= O_DIRECT; - ns->file = filp_open(ns->device_path, flags, 0); + ret = kern_path(ns->device_path, LOOKUP_FOLLOW, &path); + if (ret) { + pr_err("failed to open file %s: (%d)\n", + ns->device_path, ret); + return ret; + } + + if (configfs_path_is_configfs(&path)) { + pr_err("configfs paths cannot back namespace %s\n", + ns->device_path); + path_put(&path); + return -EINVAL; + } + + ns->file = file_open_root(&path, "", flags, 0); + path_put(&path); if (IS_ERR(ns->file)) { ret = PTR_ERR(ns->file); pr_err("failed to open file %s: (%d)\n", ``` Alright, I see the change. It's no longer using `filp_open(ns->device_path, flags, 0)`. Instead, it uses `kern_path` to resolve the path and then checks if the path is ConfigFS. If it is a ConfigFS path, it correctly returns `-EINVAL`, preventing the dangerous scenario. That's good! But now I'm thinking about `ns->file = file_open_root(&path, "", flags, 0);`. That seems strange, particularly the empty string (`""`). I'm not entirely sure I understand the implications of providing an empty string for the second argument in `file_open_root`. I need to dig into the kernel source and understand exactly what this `file_open_root` function does with that empty string. I'll check its definition to clarify its behavior.
18/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "file_open_root" } Results: { "Output": "Documentation/filesystems/path-lookup.rst=428=the calling process. An alternate root can be provided as when\nDocumentation/filesystems/path-lookup.rst:429:``sysctl()`` calls ``file_open_root()``, and when NFSv4 or Btrfs call\nDocumentation/filesystems/path-lookup.rst-430-``mount_subtree()``. In each case a pathname is being looked up in a very\n--\nDocumentation/filesystems/path-lookup.rst=655=filename_parentat(),\nDocumentation/filesystems/path-lookup.rst:656:do_filp_open(), and do_file_open_root(). These four\nDocumentation/filesystems/path-lookup.rst-657-correspond roughly to the three ``path_()`` functions we met earlier,\n--\nDocumentation/filesystems/porting.rst=899=only a part of obtained data, you should do iov_iter_revert().\n--\nDocumentation/filesystems/porting.rst-904-\nDocumentation/filesystems/porting.rst:905:Calling conventions for file_open_root() changed; now it takes struct path \nDocumentation/filesystems/porting.rst-906-instead of passing mount and dentry separately. For callers that used to\nDocumentation/filesystems/porting.rst=907=pass \u003cmnt, mnt-\u003emnt_root\u003e pair (i.e. the root of given mount), a new helper\nDocumentation/filesystems/porting.rst:908:is provided - file_open_root_mnt(). In-tree users adjusted.\nDocumentation/filesystems/porting.rst-909-\n--\narch/um/drivers/mconsole_kern.c=127=void mconsole_proc(struct mc_request req)\n--\narch/um/drivers/mconsole_kern.c-143-\t}\narch/um/drivers/mconsole_kern.c:144:\tfile = file_open_root_mnt(mnt, ptr, O_RDONLY, 0);\narch/um/drivers/mconsole_kern.c-145-\tif (IS_ERR(file)) {\n--\ndrivers/nvme/target/io-cmd-file.c=35=int nvmet_file_ns_enable(struct nvmet_ns ns)\n--\ndrivers/nvme/target/io-cmd-file.c-57-\ndrivers/nvme/target/io-cmd-file.c:58:\tns-\u003efile = file_open_root(\u0026path, \"\", flags, 0);\ndrivers/nvme/target/io-cmd-file.c-59-\tpath_put(\u0026path);\n--\ndrivers/nvme/target/passthru.c=589=int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/passthru.c-618-\ndrivers/nvme/target/passthru.c:619:\tfile = file_open_root(\u0026path, \"\", O_RDWR, 0);\ndrivers/nvme/target/passthru.c-620-\tpath_put(\u0026path);\n--\nfs/fhandle.c=416=static struct file file_open_handle(struct path path, int open_flag)\n--\nfs/fhandle.c-423-\nfs/fhandle.c:424:\treturn file_open_root(path, \"\", open_flag, 0);\nfs/fhandle.c-425-}\n--\nfs/internal.h=194=extern struct file do_file_open(int dfd, struct filename pathname,\nfs/internal.h-195-\t\tconst struct open_flags op);\nfs/internal.h:196:extern struct file do_file_open_root(const struct path ,\nfs/internal.h-197-\t\tconst char , const struct open_flags );\n--\nfs/namei.c=5097=struct file do_file_open(int dfd, struct filename pathname,\n--\nfs/namei.c-5115-\nfs/namei.c:5116:struct file do_file_open_root(const struct path root,\nfs/namei.c-5117-\t\tconst char name, const struct open_flags op)\n--\nfs/nsfs.c=650=static struct file nsfs_export_open(const struct path path, unsigned int oflags)\nfs/nsfs.c-651-{\nfs/nsfs.c:652:\treturn file_open_root(path, \"\", oflags, 0);\nfs/nsfs.c-653-}\n--\nfs/open.c=1429=EXPORT_SYMBOL(filp_open);\nfs/open.c-1430-\nfs/open.c:1431:struct file file_open_root(const struct path root,\nfs/open.c-1432-\t\t\t const char filename, int flags, umode_t mode)\n--\nfs/open.c-1438-\t\treturn ERR_PTR(err);\nfs/open.c:1439:\treturn do_file_open_root(root, filename, \u0026op);\nfs/open.c-1440-}\nfs/open.c:1441:EXPORT_SYMBOL(file_open_root);\nfs/open.c-1442-\n--\nfs/proc/proc_sysctl.c=1614=static int process_sysctl_arg(char param, char val,\n--\nfs/proc/proc_sysctl.c-1671-\nfs/proc/proc_sysctl.c:1672:\tfile = file_open_root_mnt(proc_mnt, path, O_WRONLY, 0);\nfs/proc/proc_sysctl.c-1673-\tif (IS_ERR(file)) {\n--\ninclude/linux/exportfs.h=170=struct handle_to_path_ctx {\n--\ninclude/linux/exportfs.h-255- * Allow filesystems to specify a custom open function for the\ninclude/linux/exportfs.h:256: * open_by_handle_at(2) syscall instead of the default file_open_root().\ninclude/linux/exportfs.h-257- * This custom open function is not respected by nfsd.\n--\ninclude/linux/fs.h=2493=extern struct file filp_open(const char , int, umode_t);\ninclude/linux/fs.h:2494:extern struct file file_open_root(const struct path ,\ninclude/linux/fs.h-2495-\t\t\t\t const char , int, umode_t);\ninclude/linux/fs.h:2496:static inline struct file file_open_root_mnt(struct vfsmount mnt,\ninclude/linux/fs.h-2497-\t\t\t\t const char name, int flags, umode_t mode)\ninclude/linux/fs.h-2498-{\ninclude/linux/fs.h:2499:\treturn file_open_root(\u0026(struct path){.mnt = mnt, .dentry = mnt-\u003emnt_root},\ninclude/linux/fs.h-2500-\t\t\t name, flags, mode);\n" }
19/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22930 output: 18 thoughts: 478 Thoughts: My Assessment of the `file_open_root` Path and Potential Syzkaller Interaction Okay, so `file_open_root(path, "", flags, 0)` is a standard function, used within the kernel and called by things like `file_open_handle` and `nsfs_export_open`. That's good to know. Now, the question is, how does this relate to `configfs` and `nvmet`? And, crucially, can Syzkaller, in its tests, actually reach this code path? My initial thought is to investigate how `configfs` and `nvmet` are utilized. Does Syzkaller interact with them now, or could it interact with them? Let me verify if either an unprivileged or root user can mount and interact with `configfs`. Since Syzkaller operates with root or user namespace privileges, that part seems promising. We mount at `/sys/kernel/config`. Okay, next: does Syzkaller's syzlang have descriptions for `nvmet` or `configfs`? Wait! I've got to remember the critical instruction I read earlier! This tool isn't for searching those descriptions, especially for pseudo-syscalls like 'long syz_'. It's `read-syz-spec` and `syz-grepper` for those. But hold on... are those tools even available? Let me double-check the tool declaration list. Okay, I have `grepper`, `codesearch-dir-index`, `read-file`, and `set-results`. No `read-syz-spec` or `syz-grepper`! So I'm limited to what I can do here. I cannot call tools that are not declared! Right, back to the basics. Syzkaller is primarily using standard syscalls: `openat`, `mkdir`, `write`, etc. That's a key observation. Basically anyone interacting with the filesystem can mount `configfs`, `mkdir /sys/kernel/config/nvmet/...`, and write to files there. Now, let me confirm if `CONFIGFS_FS` and `NVME_TARGET` are enabled in the kernel config. Let me now examine `nvmet_init` and how `nvmet` is registered within the `configfs` framework.
20/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "nvmet_init" } Results: { "Output": "drivers/nvme/target/configfs.c=2356=static struct configfs_subsystem nvmet_configfs_subsystem = {\n--\ndrivers/nvme/target/configfs.c-2364-\ndrivers/nvme/target/configfs.c:2365:int __init nvmet_init_configfs(void)\ndrivers/nvme/target/configfs.c-2366-{\n--\ndrivers/nvme/target/core.c=1456=EXPORT_SYMBOL_GPL(nvmet_update_cc);\ndrivers/nvme/target/core.c-1457-\ndrivers/nvme/target/core.c:1458:static void nvmet_init_cap(struct nvmet_ctrl ctrl)\ndrivers/nvme/target/core.c-1459-{\n--\ndrivers/nvme/target/core.c=1599=struct nvmet_ctrl nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args args)\n--\ndrivers/nvme/target/core.c-1654-\tctrl-\u003epi_support = ctrl-\u003eport-\u003epi_enable \u0026\u0026 ctrl-\u003esubsys-\u003epi_support;\ndrivers/nvme/target/core.c:1655:\tnvmet_init_cap(ctrl);\ndrivers/nvme/target/core.c-1656-\tWRITE_ONCE(ctrl-\u003eaen_enabled, NVMET_AEN_CFG_OPTIONAL);\n--\ndrivers/nvme/target/core.c=1951=void nvmet_subsys_put(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/core.c-1955-\ndrivers/nvme/target/core.c:1956:static int __init nvmet_init(void)\ndrivers/nvme/target/core.c-1957-{\n--\ndrivers/nvme/target/core.c-1987-\ndrivers/nvme/target/core.c:1988:\terror = nvmet_init_debugfs();\ndrivers/nvme/target/core.c-1989-\tif (error)\n--\ndrivers/nvme/target/core.c-1991-\ndrivers/nvme/target/core.c:1992:\terror = nvmet_init_discovery();\ndrivers/nvme/target/core.c-1993-\tif (error)\n--\ndrivers/nvme/target/core.c-1995-\ndrivers/nvme/target/core.c:1996:\terror = nvmet_init_configfs();\ndrivers/nvme/target/core.c-1997-\tif (error)\n--\ndrivers/nvme/target/core.c=2019=static void __exit nvmet_exit(void)\n--\ndrivers/nvme/target/core.c-2034-\ndrivers/nvme/target/core.c:2035:module_init(nvmet_init);\ndrivers/nvme/target/core.c-2036-module_exit(nvmet_exit);\n--\ndrivers/nvme/target/debugfs.c=311=void nvmet_debugfs_subsys_free(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/debugfs.c-315-\ndrivers/nvme/target/debugfs.c:316:int __init nvmet_init_debugfs(void)\ndrivers/nvme/target/debugfs.c-317-{\n--\ndrivers/nvme/target/debugfs.h=18=void nvmet_debugfs_ns_free(struct nvmet_ns ns);\ndrivers/nvme/target/debugfs.h-19-\ndrivers/nvme/target/debugfs.h:20:int __init nvmet_init_debugfs(void);\ndrivers/nvme/target/debugfs.h-21-void nvmet_exit_debugfs(void);\n--\ndrivers/nvme/target/debugfs.h=36=static inline void nvmet_debugfs_ns_free(struct nvmet_ns ns) {}\ndrivers/nvme/target/debugfs.h-37-\ndrivers/nvme/target/debugfs.h:38:static inline int __init nvmet_init_debugfs(void)\ndrivers/nvme/target/debugfs.h-39-{\n--\ndrivers/nvme/target/discovery.c=393=u16 nvmet_parse_discovery_cmd(struct nvmet_req req)\n--\ndrivers/nvme/target/discovery.c-431-\ndrivers/nvme/target/discovery.c:432:int __init nvmet_init_discovery(void)\ndrivers/nvme/target/discovery.c-433-{\n--\ndrivers/nvme/target/nvmet.h=674=void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,\n--\ndrivers/nvme/target/nvmet.h-700-\ndrivers/nvme/target/nvmet.h:701:int __init nvmet_init_configfs(void);\ndrivers/nvme/target/nvmet.h-702-void __exit nvmet_exit_configfs(void);\ndrivers/nvme/target/nvmet.h-703-\ndrivers/nvme/target/nvmet.h:704:int __init nvmet_init_discovery(void);\ndrivers/nvme/target/nvmet.h-705-void nvmet_exit_discovery(void);\n" }
21/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 25326 output: 40 thoughts: 77 Thoughts: Here's my take on those steps: Diving into the NVMe-oF Initialization Sequence Okay, so I'm tracing the initialization of the NVMe-oF target code, and it looks like `nvmet_init()` is the entry point. Makes sense. Now, where does this lead? Ah, it calls `nvmet_init_configfs()`. That's interesting, I wonder what the configfs involvement is. I'm guessing it's how the NVMe subsystem is exposed for configuration. Time to find out! Let's see… I'll head over to `drivers/nvme/target/configfs.c` and zero in around line 2356. I'm betting that's where the critical registration happens. That's most likely where the details of `nvmet_configfs_subsystem` are being defined and integrated within configfs. Gotta dig in there and see how it's setting things up. This is likely how new NVMe-oF subsystems get created and managed through configfs. Let's see what goodies are in there!
22/2	2026/09/16 02:41	tool	read-file	0m Args: { "File": "drivers/nvme/target/configfs.c", "FirstLine": 2355, "LineCount": 40 } Results: { "Contents": "2355:\t\n2356:\tstatic struct configfs_subsystem nvmet_configfs_subsystem = {\n2357:\t\t.su_group = {\n2358:\t\t\t.cg_item = {\n2359:\t\t\t\t.ci_namebuf\t= \"nvmet\",\n2360:\t\t\t\t.ci_type\t= \u0026nvmet_root_type,\n2361:\t\t\t},\n2362:\t\t},\n2363:\t};\n2364:\t\n2365:\tint __init nvmet_init_configfs(void)\n2366:\t{\n2367:\t\tint ret;\n2368:\t\n2369:\t\tconfig_group_init(\u0026nvmet_configfs_subsystem.su_group);\n2370:\t\tmutex_init(\u0026nvmet_configfs_subsystem.su_mutex);\n2371:\t\n2372:\t\tconfig_group_init_type_name(\u0026nvmet_subsystems_group,\n2373:\t\t\t\t\"subsystems\", \u0026nvmet_subsystems_type);\n2374:\t\tconfigfs_add_default_group(\u0026nvmet_subsystems_group,\n2375:\t\t\t\t\u0026nvmet_configfs_subsystem.su_group);\n2376:\t\n2377:\t\tconfig_group_init_type_name(\u0026nvmet_ports_group,\n2378:\t\t\t\t\"ports\", \u0026nvmet_ports_type);\n2379:\t\tconfigfs_add_default_group(\u0026nvmet_ports_group,\n2380:\t\t\t\t\u0026nvmet_configfs_subsystem.su_group);\n2381:\t\n2382:\t\tconfig_group_init_type_name(\u0026nvmet_hosts_group,\n2383:\t\t\t\t\"hosts\", \u0026nvmet_hosts_type);\n2384:\t\tconfigfs_add_default_group(\u0026nvmet_hosts_group,\n2385:\t\t\t\t\u0026nvmet_configfs_subsystem.su_group);\n2386:\t\n2387:\t\tret = configfs_register_subsystem(\u0026nvmet_configfs_subsystem);\n2388:\t\tif (ret) {\n2389:\t\t\tpr_err(\"configfs_register_subsystem: %d\\n\", ret);\n2390:\t\t\treturn ret;\n2391:\t\t}\n2392:\t\n2393:\t\treturn 0;\n2394:\t}\n" }
23/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 26315 output: 32 thoughts: 107 Thoughts: Navigating the NVMe-oF Configuration Space Okay, so I'm thinking about how the NVMe-oF configuration works in the kernel. First, I need to confirm that `configfs` is mounted; that's the base. I'll check for `/sys/kernel/config`. If it's there, then `/sys/kernel/config/nvmet` should be accessible. That's the entry point for the NVMe-oF target setup. Now, within `/sys/kernel/config/nvmet`, the interesting part is `/subsystems`. This is where I create new subsystem configurations with `mkdir`. Each of those subsystems then contains a `namespaces/` directory. Inside that, I can create a namespace, let's say "1", using another `mkdir`. This is the namespace I'm going to work with. At this point, I need to carefully examine what's available inside that namespace directory. I'll need to pay close attention to the `nvmet_namespaces_type` file, because that's crucial. I'll also want to look at all the available namespace attributes to understand how I can fully configure and manage it. This is where the real work begins.
24/2	2026/09/16 02:41	tool	grepper	0m Args: { "Expression": "nvmet_ns_", "PathPrefix": "drivers/nvme/target/" } Results: { "Output": "drivers/nvme/target/admin-cmd.c=798=static void nvmet_execute_identify_ns(struct nvmet_req req)\n--\ndrivers/nvme/target/admin-cmd.c-821-\ndrivers/nvme/target/admin-cmd.c:822:\tif (nvmet_ns_revalidate(req-\u003ens)) {\ndrivers/nvme/target/admin-cmd.c-823-\t\tmutex_lock(\u0026req-\u003ens-\u003esubsys-\u003elock);\ndrivers/nvme/target/admin-cmd.c:824:\t\tnvmet_ns_changed(req-\u003ens-\u003esubsys, req-\u003ens-\u003ensid);\ndrivers/nvme/target/admin-cmd.c-825-\t\tmutex_unlock(\u0026req-\u003ens-\u003esubsys-\u003elock);\n--\ndrivers/nvme/target/admin-cmd.c-878-\ndrivers/nvme/target/admin-cmd.c:879:\tif (req-\u003esq-\u003ectrl-\u003epi_support \u0026\u0026 nvmet_ns_has_pi(req-\u003ens)) {\ndrivers/nvme/target/admin-cmd.c-880-\t\tid-\u003edpc = NVME_NS_DPC_PI_FIRST \| NVME_NS_DPC_PI_LAST \|\n--\ndrivers/nvme/target/admin-cmd.c=1192=static u16 nvmet_set_feat_write_protect(struct nvmet_req req)\n--\ndrivers/nvme/target/admin-cmd.c-1218-\tif (!status)\ndrivers/nvme/target/admin-cmd.c:1219:\t\tnvmet_ns_changed(subsys, req-\u003ens-\u003ensid);\ndrivers/nvme/target/admin-cmd.c-1220-\tmutex_unlock(\u0026subsys-\u003elock);\n--\ndrivers/nvme/target/configfs.c=520=CONFIGFS_ATTR(nvmet_, addr_tsas);\n--\ndrivers/nvme/target/configfs.c-524- /\ndrivers/nvme/target/configfs.c:525:static ssize_t nvmet_ns_device_path_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-526-{\n--\ndrivers/nvme/target/configfs.c-529-\ndrivers/nvme/target/configfs.c:530:static ssize_t nvmet_ns_device_path_store(struct config_item item,\ndrivers/nvme/target/configfs.c-531-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-561-\ndrivers/nvme/target/configfs.c:562:CONFIGFS_ATTR(nvmet_ns_, device_path);\ndrivers/nvme/target/configfs.c-563-\ndrivers/nvme/target/configfs.c-564-#ifdef CONFIG_PCI_P2PDMA\ndrivers/nvme/target/configfs.c:565:static ssize_t nvmet_ns_p2pmem_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-566-{\n--\ndrivers/nvme/target/configfs.c-571-\ndrivers/nvme/target/configfs.c:572:static ssize_t nvmet_ns_p2pmem_store(struct config_item item,\ndrivers/nvme/target/configfs.c-573-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-602-\ndrivers/nvme/target/configfs.c:603:CONFIGFS_ATTR(nvmet_ns_, p2pmem);\ndrivers/nvme/target/configfs.c-604-#endif / CONFIG_PCI_P2PDMA /\ndrivers/nvme/target/configfs.c-605-\ndrivers/nvme/target/configfs.c:606:static ssize_t nvmet_ns_device_uuid_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-607-{\n--\ndrivers/nvme/target/configfs.c-610-\ndrivers/nvme/target/configfs.c:611:static ssize_t nvmet_ns_device_uuid_store(struct config_item item,\ndrivers/nvme/target/configfs.c-612-\t\t\t\t\t const char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-631-\ndrivers/nvme/target/configfs.c:632:CONFIGFS_ATTR(nvmet_ns_, device_uuid);\ndrivers/nvme/target/configfs.c-633-\ndrivers/nvme/target/configfs.c:634:static ssize_t nvmet_ns_device_nguid_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-635-{\n--\ndrivers/nvme/target/configfs.c-638-\ndrivers/nvme/target/configfs.c:639:static ssize_t nvmet_ns_device_nguid_store(struct config_item item,\ndrivers/nvme/target/configfs.c-640-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-677-\ndrivers/nvme/target/configfs.c:678:CONFIGFS_ATTR(nvmet_ns_, device_nguid);\ndrivers/nvme/target/configfs.c-679-\ndrivers/nvme/target/configfs.c:680:static ssize_t nvmet_ns_ana_grpid_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-681-{\n--\ndrivers/nvme/target/configfs.c-684-\ndrivers/nvme/target/configfs.c:685:static ssize_t nvmet_ns_ana_grpid_store(struct config_item item,\ndrivers/nvme/target/configfs.c-686-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-711-\ndrivers/nvme/target/configfs.c:712:CONFIGFS_ATTR(nvmet_ns_, ana_grpid);\ndrivers/nvme/target/configfs.c-713-\ndrivers/nvme/target/configfs.c:714:static ssize_t nvmet_ns_enable_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-715-{\n--\ndrivers/nvme/target/configfs.c-718-\ndrivers/nvme/target/configfs.c:719:static ssize_t nvmet_ns_enable_store(struct config_item item,\ndrivers/nvme/target/configfs.c-720-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-736-\tif (enable)\ndrivers/nvme/target/configfs.c:737:\t\tret = nvmet_ns_enable(ns);\ndrivers/nvme/target/configfs.c-738-\telse\ndrivers/nvme/target/configfs.c:739:\t\tnvmet_ns_disable(ns);\ndrivers/nvme/target/configfs.c-740-\tup_write(\u0026nvmet_config_sem);\n--\ndrivers/nvme/target/configfs.c-744-\ndrivers/nvme/target/configfs.c:745:CONFIGFS_ATTR(nvmet_ns_, enable);\ndrivers/nvme/target/configfs.c-746-\ndrivers/nvme/target/configfs.c:747:static ssize_t nvmet_ns_buffered_io_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-748-{\n--\ndrivers/nvme/target/configfs.c-751-\ndrivers/nvme/target/configfs.c:752:static ssize_t nvmet_ns_buffered_io_store(struct config_item item,\ndrivers/nvme/target/configfs.c-753-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-772-\ndrivers/nvme/target/configfs.c:773:CONFIGFS_ATTR(nvmet_ns_, buffered_io);\ndrivers/nvme/target/configfs.c-774-\ndrivers/nvme/target/configfs.c:775:static ssize_t nvmet_ns_revalidate_size_store(struct config_item item,\ndrivers/nvme/target/configfs.c-776-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-792-\t}\ndrivers/nvme/target/configfs.c:793:\tif (nvmet_ns_revalidate(ns))\ndrivers/nvme/target/configfs.c:794:\t\tnvmet_ns_changed(ns-\u003esubsys, ns-\u003ensid);\ndrivers/nvme/target/configfs.c-795-\tmutex_unlock(\u0026ns-\u003esubsys-\u003elock);\n--\ndrivers/nvme/target/configfs.c-798-\ndrivers/nvme/target/configfs.c:799:CONFIGFS_ATTR_WO(nvmet_ns_, revalidate_size);\ndrivers/nvme/target/configfs.c-800-\ndrivers/nvme/target/configfs.c:801:static ssize_t nvmet_ns_resv_enable_show(struct config_item item, char page)\ndrivers/nvme/target/configfs.c-802-{\n--\ndrivers/nvme/target/configfs.c-805-\ndrivers/nvme/target/configfs.c:806:static ssize_t nvmet_ns_resv_enable_store(struct config_item item,\ndrivers/nvme/target/configfs.c-807-\t\tconst char page, size_t count)\n--\ndrivers/nvme/target/configfs.c-824-}\ndrivers/nvme/target/configfs.c:825:CONFIGFS_ATTR(nvmet_ns_, resv_enable);\ndrivers/nvme/target/configfs.c-826-\ndrivers/nvme/target/configfs.c:827:static struct configfs_attribute nvmet_ns_attrs[] = {\ndrivers/nvme/target/configfs.c:828:\t\u0026nvmet_ns_attr_device_path,\ndrivers/nvme/target/configfs.c:829:\t\u0026nvmet_ns_attr_device_nguid,\ndrivers/nvme/target/configfs.c:830:\t\u0026nvmet_ns_attr_device_uuid,\ndrivers/nvme/target/configfs.c:831:\t\u0026nvmet_ns_attr_ana_grpid,\ndrivers/nvme/target/configfs.c:832:\t\u0026nvmet_ns_attr_enable,\ndrivers/nvme/target/configfs.c:833:\t\u0026nvmet_ns_attr_buffered_io,\ndrivers/nvme/target/configfs.c:834:\t\u0026nvmet_ns_attr_revalidate_size,\ndrivers/nvme/target/configfs.c:835:\t\u0026nvmet_ns_attr_resv_enable,\ndrivers/nvme/target/configfs.c-836-#ifdef CONFIG_PCI_P2PDMA\ndrivers/nvme/target/configfs.c:837:\t\u0026nvmet_ns_attr_p2pmem,\ndrivers/nvme/target/configfs.c-838-#endif\n--\ndrivers/nvme/target/configfs.c-841-\ndrivers/nvme/target/configfs.c:842:static void nvmet_ns_release(struct config_item item)\ndrivers/nvme/target/configfs.c-843-{\n--\ndrivers/nvme/target/configfs.c-845-\ndrivers/nvme/target/configfs.c:846:\tnvmet_ns_free(ns);\ndrivers/nvme/target/configfs.c-847-}\ndrivers/nvme/target/configfs.c-848-\ndrivers/nvme/target/configfs.c:849:static struct configfs_item_operations nvmet_ns_item_ops = {\ndrivers/nvme/target/configfs.c:850:\t.release\t\t= nvmet_ns_release,\ndrivers/nvme/target/configfs.c-851-};\ndrivers/nvme/target/configfs.c-852-\ndrivers/nvme/target/configfs.c:853:static const struct config_item_type nvmet_ns_type = {\ndrivers/nvme/target/configfs.c:854:\t.ct_item_ops\t\t= \u0026nvmet_ns_item_ops,\ndrivers/nvme/target/configfs.c:855:\t.ct_attrs\t\t= nvmet_ns_attrs,\ndrivers/nvme/target/configfs.c-856-\t.ct_owner\t\t= THIS_MODULE,\n--\ndrivers/nvme/target/configfs.c-858-\ndrivers/nvme/target/configfs.c:859:static struct config_group nvmet_ns_make(struct config_group group,\ndrivers/nvme/target/configfs.c-860-\t\tconst char name)\n--\ndrivers/nvme/target/configfs.c-877-\tret = -ENOMEM;\ndrivers/nvme/target/configfs.c:878:\tns = nvmet_ns_alloc(subsys, nsid);\ndrivers/nvme/target/configfs.c-879-\tif (!ns)\ndrivers/nvme/target/configfs.c-880-\t\tgoto out;\ndrivers/nvme/target/configfs.c:881:\tconfig_group_init_type_name(\u0026ns-\u003egroup, name, \u0026nvmet_ns_type);\ndrivers/nvme/target/configfs.c-882-\n--\ndrivers/nvme/target/configfs.c=890=static struct configfs_group_operations nvmet_namespaces_group_ops = {\ndrivers/nvme/target/configfs.c:891:\t.make_group\t\t= nvmet_ns_make,\ndrivers/nvme/target/configfs.c-892-};\n--\ndrivers/nvme/target/core.c=214=static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl ctrl, __le32 nsid)\n--\ndrivers/nvme/target/core.c-237-\ndrivers/nvme/target/core.c:238:void nvmet_ns_changed(struct nvmet_subsys subsys, u32 nsid)\ndrivers/nvme/target/core.c-239-{\n--\ndrivers/nvme/target/core.c=472=void nvmet_put_namespace(struct nvmet_ns ns)\n--\ndrivers/nvme/target/core.c-476-\ndrivers/nvme/target/core.c:477:static void nvmet_ns_dev_disable(struct nvmet_ns ns)\ndrivers/nvme/target/core.c-478-{\n--\ndrivers/nvme/target/core.c=483=static int nvmet_p2pmem_ns_enable(struct nvmet_ns ns)\n--\ndrivers/nvme/target/core.c-502-\tif (ns-\u003ep2p_dev) {\ndrivers/nvme/target/core.c:503:\t\tret = pci_p2pdma_distance(ns-\u003ep2p_dev, nvmet_ns_dev(ns), true);\ndrivers/nvme/target/core.c-504-\t\tif (ret \u003c 0)\n--\ndrivers/nvme/target/core.c-513-\ndrivers/nvme/target/core.c:514:\t\tp2p_dev = pci_p2pmem_find(nvmet_ns_dev(ns));\ndrivers/nvme/target/core.c-515-\t\tif (!p2p_dev) {\n--\ndrivers/nvme/target/core.c=527=static void nvmet_p2pmem_ns_add_p2p(struct nvmet_ctrl ctrl,\n--\ndrivers/nvme/target/core.c-546-\t\tclients[0] = ctrl-\u003ep2p_client;\ndrivers/nvme/target/core.c:547:\t\tclients[1] = nvmet_ns_dev(ns);\ndrivers/nvme/target/core.c-548-\n--\ndrivers/nvme/target/core.c-564-\ndrivers/nvme/target/core.c:565:bool nvmet_ns_revalidate(struct nvmet_ns ns)\ndrivers/nvme/target/core.c-566-{\n--\ndrivers/nvme/target/core.c-576-\ndrivers/nvme/target/core.c:577:int nvmet_ns_enable(struct nvmet_ns ns)\ndrivers/nvme/target/core.c-578-{\n--\ndrivers/nvme/target/core.c-621-\ndrivers/nvme/target/core.c:622:\tnvmet_ns_changed(subsys, ns-\u003ensid);\ndrivers/nvme/target/core.c-623-\tns-\u003eenabled = true;\n--\ndrivers/nvme/target/core.c-636-out_dev_disable:\ndrivers/nvme/target/core.c:637:\tnvmet_ns_dev_disable(ns);\ndrivers/nvme/target/core.c-638-\tgoto out_unlock;\n--\ndrivers/nvme/target/core.c-640-\ndrivers/nvme/target/core.c:641:void nvmet_ns_disable(struct nvmet_ns ns)\ndrivers/nvme/target/core.c-642-{\n--\ndrivers/nvme/target/core.c-675-\tmutex_lock(\u0026subsys-\u003elock);\ndrivers/nvme/target/core.c:676:\tnvmet_ns_changed(subsys, ns-\u003ensid);\ndrivers/nvme/target/core.c:677:\tnvmet_ns_dev_disable(ns);\ndrivers/nvme/target/core.c-678-out_unlock:\n--\ndrivers/nvme/target/core.c-681-\ndrivers/nvme/target/core.c:682:void nvmet_ns_free(struct nvmet_ns ns)\ndrivers/nvme/target/core.c-683-{\n--\ndrivers/nvme/target/core.c-685-\ndrivers/nvme/target/core.c:686:\tnvmet_ns_disable(ns);\ndrivers/nvme/target/core.c-687-\n--\ndrivers/nvme/target/core.c-704-\ndrivers/nvme/target/core.c:705:struct nvmet_ns nvmet_ns_alloc(struct nvmet_subsys subsys, u32 nsid)\ndrivers/nvme/target/core.c-706-{\n--\ndrivers/nvme/target/core.c=1073=static u32 nvmet_io_cmd_transfer_len(struct nvmet_req req)\n--\ndrivers/nvme/target/core.c-1087-\tcase nvme_cmd_zone_append:\ndrivers/nvme/target/core.c:1088:\t\tif (req-\u003esq-\u003ectrl-\u003epi_support \u0026\u0026 nvmet_ns_has_pi(req-\u003ens))\ndrivers/nvme/target/core.c-1089-\t\t\tmetadata_len = nvmet_rw_metadata_len(req);\n--\ndrivers/nvme/target/debugfs.c=179=static void nvmet_pr_notify_mask_to_str(struct seq_file m, unsigned long mask)\n--\ndrivers/nvme/target/debugfs.c-198-\ndrivers/nvme/target/debugfs.c:199:static int nvmet_ns_pr_show(struct seq_file m, void p)\ndrivers/nvme/target/debugfs.c-200-{\n--\ndrivers/nvme/target/debugfs.c-233-}\ndrivers/nvme/target/debugfs.c:234:NVMET_DEBUGFS_ATTR(nvmet_ns_pr);\ndrivers/nvme/target/debugfs.c-235-\ndrivers/nvme/target/debugfs.c=236=void nvmet_debugfs_ns_setup(struct nvmet_ns ns)\n--\ndrivers/nvme/target/debugfs.c-249-\tdebugfs_create_file(\"reservation\", 0400, ns-\u003edebugfs_dir, ns,\ndrivers/nvme/target/debugfs.c:250:\t\t\t \u0026nvmet_ns_pr_fops);\ndrivers/nvme/target/debugfs.c-251-}\n--\ndrivers/nvme/target/io-cmd-bdev.c=454=u16 nvmet_bdev_parse_io_cmd(struct nvmet_req req)\n--\ndrivers/nvme/target/io-cmd-bdev.c-459-\t\treq-\u003eexecute = nvmet_bdev_execute_rw;\ndrivers/nvme/target/io-cmd-bdev.c:460:\t\tif (req-\u003esq-\u003ectrl-\u003epi_support \u0026\u0026 nvmet_ns_has_pi(req-\u003ens))\ndrivers/nvme/target/io-cmd-bdev.c-461-\t\t\treq-\u003emetadata_len = nvmet_rw_metadata_len(req);\n--\ndrivers/nvme/target/nvmet.h=136=static inline struct nvmet_ns to_nvmet_ns(struct config_item item)\n--\ndrivers/nvme/target/nvmet.h-140-\ndrivers/nvme/target/nvmet.h:141:static inline struct device nvmet_ns_dev(struct nvmet_ns ns)\ndrivers/nvme/target/nvmet.h-142-{\n--\ndrivers/nvme/target/nvmet.h=638=void nvmet_put_namespace(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h:639:int nvmet_ns_enable(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h:640:void nvmet_ns_disable(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h:641:struct nvmet_ns nvmet_ns_alloc(struct nvmet_subsys subsys, u32 nsid);\ndrivers/nvme/target/nvmet.h:642:void nvmet_ns_free(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h-643-\n--\ndrivers/nvme/target/nvmet.h=721=u16 nvmet_file_flush(struct nvmet_req req);\ndrivers/nvme/target/nvmet.h:722:void nvmet_ns_changed(struct nvmet_subsys subsys, u32 nsid);\ndrivers/nvme/target/nvmet.h-723-void nvmet_bdev_ns_revalidate(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h=724=void nvmet_file_ns_revalidate(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h:725:bool nvmet_ns_revalidate(struct nvmet_ns ns);\ndrivers/nvme/target/nvmet.h-726-u16 blk_to_nvme_status(struct nvmet_req req, blk_status_t blk_sts);\n--\ndrivers/nvme/target/nvmet.h=863=static inline __le16 to0based(u32 a)\n--\ndrivers/nvme/target/nvmet.h-867-\ndrivers/nvme/target/nvmet.h:868:static inline bool nvmet_ns_has_pi(struct nvmet_ns ns)\ndrivers/nvme/target/nvmet.h-869-{\n--\ndrivers/nvme/target/pr.c=1063=int nvmet_ctrl_init_pr(struct nvmet_ctrl ctrl)\n--\ndrivers/nvme/target/pr.c-1078-\t * we can make sure that ns is not enabled, and not call\ndrivers/nvme/target/pr.c:1079:\t * nvmet_pr_init_ns(), see more details in nvmet_ns_enable().\ndrivers/nvme/target/pr.c-1080-\t * So just check ns-\u003epr.enable.\n--\ndrivers/nvme/target/zns.c=90=void nvmet_execute_identify_ns_zns(struct nvmet_req *req)\n--\ndrivers/nvme/target/zns.c-112-\ndrivers/nvme/target/zns.c:113:\tif (nvmet_ns_revalidate(req-\u003ens)) {\ndrivers/nvme/target/zns.c-114-\t\tmutex_lock(\u0026req-\u003ens-\u003esubsys-\u003elock);\ndrivers/nvme/target/zns.c:115:\t\tnvmet_ns_changed(req-\u003ens-\u003esubsys, req-\u003ens-\u003ensid);\ndrivers/nvme/target/zns.c-116-\t\tmutex_unlock(\u0026req-\u003ens-\u003esubsys-\u003elock);\n" }
25/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33273 output: 38 thoughts: 54 Thoughts: Diving into NVMe Namespace Enablement Okay, so I need to understand how namespaces are enabled in the NVMe target driver. Let's start by digging into the code. The file `drivers/nvme/target/core.c` seems like the central point of interest here, and specifically around line 577. I'm guessing that's where the critical function calls reside. From the looks of it, `nvmet_ns_enable` is the key function to examine. It seems it delegates the enable process further, calling both `nvmet_bdev_ns_enable` and `nvmet_file_ns_enable`. This strongly suggests a separation of concerns based on the underlying namespace type. I need to understand the behavior of each of those two further functions to grasp the whole picture. So, the question remains: are the namespaces enabled as block devices or as file systems? I will need to inspect those two functions.
26/2	2026/09/16 02:41	tool	read-file	0m Args: { "File": "drivers/nvme/target/core.c", "FirstLine": 577, "LineCount": 40 } Results: { "Contents": " 577:\tint nvmet_ns_enable(struct nvmet_ns ns)\n 578:\t{\n 579:\t\tstruct nvmet_subsys subsys = ns-\u003esubsys;\n 580:\t\tstruct nvmet_ctrl *ctrl;\n 581:\t\tint ret;\n 582:\t\n 583:\t\tmutex_lock(\u0026subsys-\u003elock);\n 584:\t\tret = 0;\n 585:\t\n 586:\t\tif (nvmet_is_passthru_subsys(subsys)) {\n 587:\t\t\tpr_info(\"cannot enable both passthru and regular namespaces for a single subsystem\");\n 588:\t\t\tgoto out_unlock;\n 589:\t\t}\n 590:\t\n 591:\t\tif (ns-\u003eenabled)\n 592:\t\t\tgoto out_unlock;\n 593:\t\n 594:\t\tif (!ns-\u003edevice_path) {\n 595:\t\t\tret = -EINVAL;\n 596:\t\t\tgoto out_unlock;\n 597:\t\t}\n 598:\t\n 599:\t\tret = nvmet_bdev_ns_enable(ns);\n 600:\t\tif (ret == -ENOTBLK)\n 601:\t\t\tret = nvmet_file_ns_enable(ns);\n 602:\t\tif (ret)\n 603:\t\t\tgoto out_unlock;\n 604:\t\n 605:\t\tret = nvmet_p2pmem_ns_enable(ns);\n 606:\t\tif (ret)\n 607:\t\t\tgoto out_dev_disable;\n 608:\t\n 609:\t\tlist_for_each_entry(ctrl, \u0026subsys-\u003ectrls, subsys_entry)\n 610:\t\t\tnvmet_p2pmem_ns_add_p2p(ctrl, ns);\n 611:\t\n 612:\t\tif (ns-\u003epr.enable) {\n 613:\t\t\tret = nvmet_pr_init_ns(ns);\n 614:\t\t\tif (ret)\n 615:\t\t\t\tgoto out_dev_put;\n 616:\t\t}\n" }
27/2	2026/09/16 02:41	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 34137 output: 24 thoughts: 2131 Thoughts: Reaching a Potential Kernel Bug: An Analysis for Fuzzing Okay, so the code checks if `device_path` points to a block device. If it doesn't, like a regular file or, crucially, a configfs file, then the code calls `nvmet_file_ns_enable(ns)`. Previously, it just used `filp_open()` directly with the `device_path`. The current patch replaces this with `kern_path()` followed by a check using `configfs_path_is_configfs()` and then uses `file_open_root()`. The same refactoring is present in `nvmet_passthru_ctrl_enable`. I remember reading about some sort of deadlock or race condition. If the `device_path` was set to something within `/sys/kernel/config/nvmet/...`, which is a configfs path, and then someone enables the namespace by writing "1" to "enable", the original code would open a file while holding important locks, possibly leading to deadlocks if configfs was also using those locks, recursion, or other badness. The `configfs_path_is_configfs()` function was added to prevent this. Now, the important question: is this code reachable? The analysis guidelines are clear: reachability is the primary concern for fuzzing. I need to determine if this modified code can be executed in standard virtual environments like QEMU. It must not be fuzzed if modified code is not reachable! Also, refactorings and new assertions are important and must be fuzzed. So, is it? NVMe target support is reachable in QEMU! It uses configfs (`/sys/kernel/config/nvmet`). It also supports loopback and TCP transports and doesn't even need a transport to enable a namespace. This means this is reachable! To enable a namespace in nvmet you do this: 1. `mkdir /sys/kernel/config/nvmet/subsystems/test` 2. `mkdir /sys/kernel/config/nvmet/subsystems/test/namespaces/1` 3. `echo "/some/path" > /sys/kernel/config/nvmet/subsystems/test/namespaces/1/device_path` 4. `echo 1 > /sys/kernel/config/nvmet/subsystems/test/namespaces/1/enable` This sequence executes the code paths `nvmet_ns_enable_store` -> `nvmet_ns_enable` -> `nvmet_file_ns_enable`. And, the all-important check `configfs_path_is_configfs(&path)` from `fs/configfs/mount.c` is involved! And for passthru is the same: 1. `mkdir /sys/kernel/config/nvmet/subsystems/test` 2. `echo "/dev/nvme0" > /sys/kernel/config/nvmet/subsystems/test/passthru/device_path` 3. `echo 1 > /sys/kernel/config/nvmet/subsystems/test/passthru/enable` These are reachable through standard filesystem syscalls like `mkdir`, `write`, and `open`. Therefore, I conclude this is reachable. Now, let me apply the "negative criteria" to ensure I'm not missing anything. This code isn't: * Non-kernel / non-executable (it's kernel code and executable). * Structurally unreachable hardware (it uses configfs and loopback, which are virtual). * Teardown callbacks or arch-specific. Therefore, since the code modifies reachable executable code, my conclusion is WorthFuzzing = TRUE.
28/2	2026/09/16 02:42	tool	grepper	0m Args: { "Expression": "configfs", "PathPrefix": "fs/" } Results: { "Output": "\nFull output is too long, showing 500 out of 2003 lines.\nUse more precise expression if possible.\n\nfs/Kconfig=287=config ARCH_HAS_GIGANTIC_PAGE\n--\nfs/Kconfig-289-\nfs/Kconfig:290:source \"fs/configfs/Kconfig\"\nfs/Kconfig-291-source \"fs/efivarfs/Kconfig\"\n--\nfs/Makefile=57=obj-$(CONFIG_SYSFS)\t\t+= sysfs/\nfs/Makefile:58:obj-$(CONFIG_CONFIGFS_FS)\t+= configfs/\nfs/Makefile-59-obj-y\t\t\t\t+= devpts/\n--\nfs/configfs/Kconfig=2=config CONFIGFS_FS\n--\nfs/configfs/Kconfig-4-\thelp\nfs/configfs/Kconfig:5:\t configfs is a RAM-based filesystem that provides the converse\nfs/configfs/Kconfig-6-\t of sysfs's functionality. Where sysfs is a filesystem-based\nfs/configfs/Kconfig:7:\t view of kernel objects, configfs is a filesystem-based manager\nfs/configfs/Kconfig-8-\t of kernel objects, or config_items.\nfs/configfs/Kconfig-9-\nfs/configfs/Kconfig:10:\t Both sysfs and configfs can and should exist together on the\nfs/configfs/Kconfig-11-\t same system. One is not a replacement for the other.\n--\nfs/configfs/Makefile-2-#\nfs/configfs/Makefile:3:# Makefile for the configfs virtual filesystem\nfs/configfs/Makefile-4-#\nfs/configfs/Makefile-5-\nfs/configfs/Makefile:6:obj-$(CONFIG_CONFIGFS_FS)\t+= configfs.o\nfs/configfs/Makefile-7-\nfs/configfs/Makefile:8:configfs-objs\t:= inode.o file.o dir.o symlink.o mount.o item.o\n--\nfs/configfs/configfs_internal.h-2-/\nfs/configfs/configfs_internal.h:3: configfs_internal.h - Internal stuff for configfs\nfs/configfs/configfs_internal.h-4- \n--\nfs/configfs/configfs_internal.h-7- \nfs/configfs/configfs_internal.h:8: * configfs Copyright (C) 2005 Oracle. All rights reserved.\nfs/configfs/configfs_internal.h-9- /\n--\nfs/configfs/configfs_internal.h-20-\nfs/configfs/configfs_internal.h:21:struct configfs_fragment {\nfs/configfs/configfs_internal.h-22-\tatomic_t frag_count;\n--\nfs/configfs/configfs_internal.h-26-\nfs/configfs/configfs_internal.h:27:void put_fragment(struct configfs_fragment );\nfs/configfs/configfs_internal.h:28:struct configfs_fragment get_fragment(struct configfs_fragment );\nfs/configfs/configfs_internal.h-29-\nfs/configfs/configfs_internal.h:30:struct configfs_dirent {\nfs/configfs/configfs_internal.h-31-\tatomic_t\t\ts_count;\n--\nfs/configfs/configfs_internal.h-43-#endif\nfs/configfs/configfs_internal.h:44:\tstruct configfs_fragment s_frag;\nfs/configfs/configfs_internal.h-45-};\n--\nfs/configfs/configfs_internal.h-60-\nfs/configfs/configfs_internal.h:61:extern struct mutex configfs_symlink_mutex;\nfs/configfs/configfs_internal.h:62:extern spinlock_t configfs_dirent_lock;\nfs/configfs/configfs_internal.h-63-\nfs/configfs/configfs_internal.h:64:extern struct kmem_cache configfs_dir_cachep;\nfs/configfs/configfs_internal.h-65-\nfs/configfs/configfs_internal.h:66:extern int configfs_is_root(struct config_item item);\nfs/configfs/configfs_internal.h-67-\nfs/configfs/configfs_internal.h:68:extern struct inode configfs_new_inode(umode_t mode, struct configfs_dirent , struct super_block );\nfs/configfs/configfs_internal.h:69:extern struct inode configfs_create(struct dentry , umode_t mode);\nfs/configfs/configfs_internal.h-70-\nfs/configfs/configfs_internal.h:71:extern int configfs_create_file(struct config_item , const struct configfs_attribute );\nfs/configfs/configfs_internal.h:72:extern int configfs_create_bin_file(struct config_item ,\nfs/configfs/configfs_internal.h:73:\t\t\t\t const struct configfs_bin_attribute );\nfs/configfs/configfs_internal.h:74:extern int configfs_make_dirent(struct configfs_dirent , struct dentry ,\nfs/configfs/configfs_internal.h:75:\t\t\t\tvoid , umode_t, int, struct configfs_fragment );\nfs/configfs/configfs_internal.h:76:extern int configfs_dirent_is_ready(struct configfs_dirent );\nfs/configfs/configfs_internal.h-77-\nfs/configfs/configfs_internal.h:78:extern const unsigned char configfs_get_name(struct configfs_dirent sd);\nfs/configfs/configfs_internal.h:79:extern int configfs_setattr(struct mnt_idmap idmap,\nfs/configfs/configfs_internal.h-80-\t\t\t struct dentry dentry, struct iattr iattr);\nfs/configfs/configfs_internal.h-81-\nfs/configfs/configfs_internal.h:82:extern struct dentry configfs_pin_fs(void);\nfs/configfs/configfs_internal.h:83:extern void configfs_release_fs(void);\nfs/configfs/configfs_internal.h-84-\nfs/configfs/configfs_internal.h:85:extern const struct file_operations configfs_dir_operations;\nfs/configfs/configfs_internal.h:86:extern const struct file_operations configfs_file_operations;\nfs/configfs/configfs_internal.h:87:extern const struct file_operations configfs_bin_file_operations;\nfs/configfs/configfs_internal.h:88:extern const struct inode_operations configfs_dir_inode_operations;\nfs/configfs/configfs_internal.h:89:extern const struct inode_operations configfs_root_inode_operations;\nfs/configfs/configfs_internal.h:90:extern const struct inode_operations configfs_symlink_inode_operations;\nfs/configfs/configfs_internal.h:91:extern const struct dentry_operations configfs_dentry_ops;\nfs/configfs/configfs_internal.h-92-\nfs/configfs/configfs_internal.h:93:extern int configfs_symlink(struct mnt_idmap idmap,\nfs/configfs/configfs_internal.h-94-\t\t\t struct inode dir, struct dentry dentry,\nfs/configfs/configfs_internal.h-95-\t\t\t const char symname);\nfs/configfs/configfs_internal.h:96:extern int configfs_unlink(struct inode dir, struct dentry dentry);\nfs/configfs/configfs_internal.h-97-\nfs/configfs/configfs_internal.h:98:int configfs_create_link(struct configfs_dirent target, struct dentry parent,\nfs/configfs/configfs_internal.h-99-\t\tstruct dentry dentry, char body);\n--\nfs/configfs/configfs_internal.h=101=static inline struct config_item to_item(struct dentry * dentry)\nfs/configfs/configfs_internal.h-102-{\nfs/configfs/configfs_internal.h:103:\tstruct configfs_dirent * sd = dentry-\u003ed_fsdata;\nfs/configfs/configfs_internal.h-104-\treturn ((struct config_item ) sd-\u003es_element);\n--\nfs/configfs/configfs_internal.h-106-\nfs/configfs/configfs_internal.h:107:static inline struct configfs_attribute to_attr(struct dentry * dentry)\nfs/configfs/configfs_internal.h-108-{\nfs/configfs/configfs_internal.h:109:\tstruct configfs_dirent * sd = dentry-\u003ed_fsdata;\nfs/configfs/configfs_internal.h:110:\treturn ((struct configfs_attribute ) sd-\u003es_element);\nfs/configfs/configfs_internal.h-111-}\nfs/configfs/configfs_internal.h-112-\nfs/configfs/configfs_internal.h:113:static inline struct configfs_bin_attribute to_bin_attr(struct dentry dentry)\nfs/configfs/configfs_internal.h-114-{\nfs/configfs/configfs_internal.h:115:\tstruct configfs_attribute attr = to_attr(dentry);\nfs/configfs/configfs_internal.h-116-\nfs/configfs/configfs_internal.h:117:\treturn container_of(attr, struct configfs_bin_attribute, cb_attr);\nfs/configfs/configfs_internal.h-118-}\nfs/configfs/configfs_internal.h-119-\nfs/configfs/configfs_internal.h:120:static inline struct config_item configfs_get_config_item(struct dentry dentry)\nfs/configfs/configfs_internal.h-121-{\n--\nfs/configfs/configfs_internal.h-125-\tif (!d_unhashed(dentry)) {\nfs/configfs/configfs_internal.h:126:\t\tstruct configfs_dirent * sd = dentry-\u003ed_fsdata;\nfs/configfs/configfs_internal.h-127-\t\titem = config_item_get(sd-\u003es_element);\n--\nfs/configfs/configfs_internal.h-133-\nfs/configfs/configfs_internal.h:134:static inline void release_configfs_dirent(struct configfs_dirent * sd)\nfs/configfs/configfs_internal.h-135-{\n--\nfs/configfs/configfs_internal.h-138-\t\tput_fragment(sd-\u003es_frag);\nfs/configfs/configfs_internal.h:139:\t\tkmem_cache_free(configfs_dir_cachep, sd);\nfs/configfs/configfs_internal.h-140-\t}\n--\nfs/configfs/configfs_internal.h-142-\nfs/configfs/configfs_internal.h:143:static inline struct configfs_dirent * configfs_get(struct configfs_dirent * sd)\nfs/configfs/configfs_internal.h-144-{\n--\nfs/configfs/configfs_internal.h-151-\nfs/configfs/configfs_internal.h:152:static inline void configfs_put(struct configfs_dirent * sd)\nfs/configfs/configfs_internal.h-153-{\n--\nfs/configfs/configfs_internal.h-155-\tif (atomic_dec_and_test(\u0026sd-\u003es_count))\nfs/configfs/configfs_internal.h:156:\t\trelease_configfs_dirent(sd);\nfs/configfs/configfs_internal.h-157-}\n--\nfs/configfs/dir.c-2-/\nfs/configfs/dir.c:3: dir.c - Operations for configfs directories.\nfs/configfs/dir.c-4- \n--\nfs/configfs/dir.c-7- \nfs/configfs/dir.c:8: * configfs Copyright (C) 2005 Oracle. All rights reserved.\nfs/configfs/dir.c-9- /\n--\nfs/configfs/dir.c-19-\nfs/configfs/dir.c:20:#include \u003clinux/configfs.h\u003e\nfs/configfs/dir.c:21:#include \"configfs_internal.h\"\nfs/configfs/dir.c-22-\nfs/configfs/dir.c-23-/\nfs/configfs/dir.c:24: * Protects mutations of configfs_dirent linkage together with proper i_mutex\nfs/configfs/dir.c:25: * Also protects mutations of symlinks linkage to target configfs_dirent\nfs/configfs/dir.c:26: * Mutators of configfs_dirent linkage must both have the proper inode locked\nfs/configfs/dir.c:27: * and configfs_dirent_lock locked, in that order.\nfs/configfs/dir.c:28: * This allows one to safely traverse configfs_dirent trees and symlinks without\nfs/configfs/dir.c-29- * having to lock inodes.\n--\nfs/configfs/dir.c-32- * unlocked is not reliable unless in detach_groups() called from\nfs/configfs/dir.c:33: * rmdir()/unregister() and from configfs_attach_group()\nfs/configfs/dir.c-34- /\nfs/configfs/dir.c:35:DEFINE_SPINLOCK(configfs_dirent_lock);\nfs/configfs/dir.c-36-\n--\nfs/configfs/dir.c-39- subsys-\u003esu_mutex is held.\nfs/configfs/dir.c:40: * But parent configfs_subsystem is NULL when config_item is root.\nfs/configfs/dir.c-41- * Use this mutex when config_item is root.\nfs/configfs/dir.c-42- /\nfs/configfs/dir.c:43:static DEFINE_MUTEX(configfs_subsystem_mutex);\nfs/configfs/dir.c-44-\nfs/configfs/dir.c:45:static void configfs_d_iput(struct dentry dentry,\nfs/configfs/dir.c-46-\t\t\t struct inode * inode)\nfs/configfs/dir.c-47-{\nfs/configfs/dir.c:48:\tstruct configfs_dirent sd = dentry-\u003ed_fsdata;\nfs/configfs/dir.c-49-\nfs/configfs/dir.c-50-\tif (sd) {\nfs/configfs/dir.c:51:\t\t/ Coordinate with configfs_readdir /\nfs/configfs/dir.c:52:\t\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-53-\t\t/\nfs/configfs/dir.c-54-\t\t * Set sd-\u003es_dentry to null only when this dentry is the one\nfs/configfs/dir.c:55:\t\t * that is going to be killed. Otherwise configfs_d_iput may\nfs/configfs/dir.c:56:\t\t * run just after configfs_lookup and set sd-\u003es_dentry to\nfs/configfs/dir.c-57-\t\t * NULL even it's still in use.\n--\nfs/configfs/dir.c-61-\nfs/configfs/dir.c:62:\t\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c:63:\t\tconfigfs_put(sd);\nfs/configfs/dir.c-64-\t}\n--\nfs/configfs/dir.c-67-\nfs/configfs/dir.c:68:const struct dentry_operations configfs_dentry_ops = {\nfs/configfs/dir.c:69:\t.d_iput\t\t= configfs_d_iput,\nfs/configfs/dir.c-70-};\n--\nfs/configfs/dir.c-75- * Helpers to make lockdep happy with our recursive locking of default groups'\nfs/configfs/dir.c:76: * inodes (see configfs_attach_group() and configfs_detach_group()).\nfs/configfs/dir.c-77- * We put default groups i_mutexes in separate classes according to their depth\n--\nfs/configfs/dir.c-88- * default groups, and reset to -1 when all default groups are attached. During\nfs/configfs/dir.c:89: * attachment, if configfs_create() sees s_depth \u003e 0, the lock class of the new\nfs/configfs/dir.c-90- * inode's mutex is set to default_group_class[s_depth - 1].\n--\nfs/configfs/dir.c-92-\nfs/configfs/dir.c:93:static void configfs_init_dirent_depth(struct configfs_dirent sd)\nfs/configfs/dir.c-94-{\n--\nfs/configfs/dir.c-97-\nfs/configfs/dir.c:98:static void configfs_set_dir_dirent_depth(struct configfs_dirent parent_sd,\nfs/configfs/dir.c:99:\t\t\t\t\t struct configfs_dirent sd)\nfs/configfs/dir.c-100-{\n--\nfs/configfs/dir.c=107=static void\nfs/configfs/dir.c:108:configfs_adjust_dir_dirent_depth_before_populate(struct configfs_dirent sd)\nfs/configfs/dir.c-109-{\n--\nfs/configfs/dir.c=128=static void\nfs/configfs/dir.c:129:configfs_adjust_dir_dirent_depth_after_populate(struct configfs_dirent sd)\nfs/configfs/dir.c-130-{\n--\nfs/configfs/dir.c-136-\nfs/configfs/dir.c:137:static void configfs_init_dirent_depth(struct configfs_dirent sd)\nfs/configfs/dir.c-138-{\n--\nfs/configfs/dir.c-140-\nfs/configfs/dir.c:141:static void configfs_set_dir_dirent_depth(struct configfs_dirent parent_sd,\nfs/configfs/dir.c:142:\t\t\t\t\t struct configfs_dirent sd)\nfs/configfs/dir.c-143-{\n--\nfs/configfs/dir.c=146=static void\nfs/configfs/dir.c:147:configfs_adjust_dir_dirent_depth_before_populate(struct configfs_dirent sd)\nfs/configfs/dir.c-148-{\n--\nfs/configfs/dir.c=151=static void\nfs/configfs/dir.c:152:configfs_adjust_dir_dirent_depth_after_populate(struct configfs_dirent sd)\nfs/configfs/dir.c-153-{\n--\nfs/configfs/dir.c-157-\nfs/configfs/dir.c:158:static struct configfs_fragment new_fragment(void)\nfs/configfs/dir.c-159-{\nfs/configfs/dir.c:160:\tstruct configfs_fragment p;\nfs/configfs/dir.c-161-\nfs/configfs/dir.c:162:\tp = kmalloc_obj(struct configfs_fragment);\nfs/configfs/dir.c-163-\tif (p) {\n--\nfs/configfs/dir.c-170-\nfs/configfs/dir.c:171:void put_fragment(struct configfs_fragment frag)\nfs/configfs/dir.c-172-{\n--\nfs/configfs/dir.c-176-\nfs/configfs/dir.c:177:struct configfs_fragment get_fragment(struct configfs_fragment frag)\nfs/configfs/dir.c-178-{\n--\nfs/configfs/dir.c-184-/\nfs/configfs/dir.c:185: * Allocates a new configfs_dirent and links it to the parent configfs_dirent\nfs/configfs/dir.c-186- /\nfs/configfs/dir.c:187:static struct configfs_dirent configfs_new_dirent(struct configfs_dirent parent_sd,\nfs/configfs/dir.c-188-\t\t\t\t\t\t void element, int type,\nfs/configfs/dir.c:189:\t\t\t\t\t\t struct configfs_fragment frag)\nfs/configfs/dir.c-190-{\nfs/configfs/dir.c:191:\tstruct configfs_dirent sd;\nfs/configfs/dir.c-192-\nfs/configfs/dir.c:193:\tsd = kmem_cache_zalloc(configfs_dir_cachep, GFP_KERNEL);\nfs/configfs/dir.c-194-\tif (!sd)\n--\nfs/configfs/dir.c-200-\tsd-\u003es_type = type;\nfs/configfs/dir.c:201:\tconfigfs_init_dirent_depth(sd);\nfs/configfs/dir.c:202:\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-203-\tif (parent_sd-\u003es_type \u0026 CONFIGFS_USET_DROPPING) {\nfs/configfs/dir.c:204:\t\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c:205:\t\tkmem_cache_free(configfs_dir_cachep, sd);\nfs/configfs/dir.c-206-\t\treturn ERR_PTR(-ENOENT);\n--\nfs/configfs/dir.c-210-\t/\nfs/configfs/dir.c:211:\t configfs_lookup scans only for unpinned items. s_children is\nfs/configfs/dir.c:212:\t * partitioned so that configfs_lookup can bail out early.\nfs/configfs/dir.c-213-\t * CONFIGFS_PINNED and CONFIGFS_NOT_PINNED are not symmetrical. readdir\n--\nfs/configfs/dir.c-219-\t\tlist_add(\u0026sd-\u003es_sibling, \u0026parent_sd-\u003es_children);\nfs/configfs/dir.c:220:\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-221-\n--\nfs/configfs/dir.c-226- \nfs/configfs/dir.c:227: Return -EEXIST if there is already a configfs element with the same\nfs/configfs/dir.c-228- * name for the same parent.\n--\nfs/configfs/dir.c-231- /\nfs/configfs/dir.c:232:static int configfs_dirent_exists(struct dentry dentry)\nfs/configfs/dir.c-233-{\nfs/configfs/dir.c:234:\tstruct configfs_dirent parent_sd = dentry-\u003ed_parent-\u003ed_fsdata;\nfs/configfs/dir.c-235-\tconst unsigned char new = dentry-\u003ed_name.name;\nfs/configfs/dir.c:236:\tstruct configfs_dirent sd;\nfs/configfs/dir.c-237-\nfs/configfs/dir.c:238:\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-239-\tlist_for_each_entry(sd, \u0026parent_sd-\u003es_children, s_sibling) {\nfs/configfs/dir.c-240-\t\tif (sd-\u003es_element) {\nfs/configfs/dir.c:241:\t\t\tif (strcmp(configfs_get_name(sd), new) == 0) {\nfs/configfs/dir.c:242:\t\t\t\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-243-\t\t\t\treturn -EEXIST;\n--\nfs/configfs/dir.c-246-\t}\nfs/configfs/dir.c:247:\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-248-\n--\nfs/configfs/dir.c-252-\nfs/configfs/dir.c:253:int configfs_make_dirent(struct configfs_dirent parent_sd,\nfs/configfs/dir.c-254-\t\t\t struct dentry * dentry, void * element,\nfs/configfs/dir.c:255:\t\t\t umode_t mode, int type, struct configfs_fragment frag)\nfs/configfs/dir.c-256-{\nfs/configfs/dir.c:257:\tstruct configfs_dirent sd;\nfs/configfs/dir.c-258-\nfs/configfs/dir.c:259:\tsd = configfs_new_dirent(parent_sd, element, type, frag);\nfs/configfs/dir.c-260-\tif (IS_ERR(sd))\n--\nfs/configfs/dir.c-265-\tif (dentry)\nfs/configfs/dir.c:266:\t\tdentry-\u003ed_fsdata = configfs_get(sd);\nfs/configfs/dir.c-267-\n--\nfs/configfs/dir.c-270-\nfs/configfs/dir.c:271:static void configfs_remove_dirent(struct dentry dentry)\nfs/configfs/dir.c-272-{\nfs/configfs/dir.c:273:\tstruct configfs_dirent sd = dentry-\u003ed_fsdata;\nfs/configfs/dir.c-274-\n--\nfs/configfs/dir.c-276-\t\treturn;\nfs/configfs/dir.c:277:\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-278-\tlist_del_init(\u0026sd-\u003es_sibling);\nfs/configfs/dir.c:279:\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c:280:\tconfigfs_put(sd);\nfs/configfs/dir.c-281-}\n--\nfs/configfs/dir.c-283-/*\nfs/configfs/dir.c:284: \tconfigfs_create_dir - create a directory for an config_item.\nfs/configfs/dir.c-285- \t@item:\t\tconfig_itemwe're creating directory for.\n--\nfs/configfs/dir.c-289- \tNote: user-created entries won't be allowed under this new directory\nfs/configfs/dir.c:290: \tuntil it is validated by configfs_dir_set_ready()\nfs/configfs/dir.c-291- /\nfs/configfs/dir.c-292-\nfs/configfs/dir.c:293:static int configfs_create_dir(struct config_item item, struct dentry dentry,\nfs/configfs/dir.c:294:\t\t\t\tstruct configfs_fragment frag)\nfs/configfs/dir.c-295-{\n--\nfs/configfs/dir.c-303-\nfs/configfs/dir.c:304:\terror = configfs_make_dirent(p-\u003ed_fsdata, dentry, item, mode,\nfs/configfs/dir.c-305-\t\t\t\t CONFIGFS_DIR \| CONFIGFS_USET_CREATING,\n--\nfs/configfs/dir.c-309-\nfs/configfs/dir.c:310:\tconfigfs_set_dir_dirent_depth(p-\u003ed_fsdata, dentry-\u003ed_fsdata);\nfs/configfs/dir.c:311:\tinode = configfs_create(dentry, mode);\nfs/configfs/dir.c-312-\tif (IS_ERR(inode))\n--\nfs/configfs/dir.c-314-\nfs/configfs/dir.c:315:\tinode-\u003ei_op = \u0026configfs_dir_inode_operations;\nfs/configfs/dir.c:316:\tinode-\u003ei_fop = \u0026configfs_dir_operations;\nfs/configfs/dir.c-317-\t/ directory inodes start off with i_nlink == 2 (for \".\" entry) /\n--\nfs/configfs/dir.c-325-out_remove:\nfs/configfs/dir.c:326:\tconfigfs_put(dentry-\u003ed_fsdata);\nfs/configfs/dir.c:327:\tconfigfs_remove_dirent(dentry);\nfs/configfs/dir.c-328-\treturn PTR_ERR(inode);\n--\nfs/configfs/dir.c-332- Allow userspace to create new entries under a new directory created with\nfs/configfs/dir.c:333: * configfs_create_dir(), and under all of its chidlren directories recursively.\nfs/configfs/dir.c:334: * @sd\t\tconfigfs_dirent of the new directory to validate\nfs/configfs/dir.c-335- \nfs/configfs/dir.c:336: Caller must hold configfs_dirent_lock.\nfs/configfs/dir.c-337- /\nfs/configfs/dir.c:338:static void configfs_dir_set_ready(struct configfs_dirent sd)\nfs/configfs/dir.c-339-{\nfs/configfs/dir.c:340:\tstruct configfs_dirent child_sd;\nfs/configfs/dir.c-341-\n--\nfs/configfs/dir.c-344-\t\tif (child_sd-\u003es_type \u0026 CONFIGFS_USET_CREATING)\nfs/configfs/dir.c:345:\t\t\tconfigfs_dir_set_ready(child_sd);\nfs/configfs/dir.c-346-}\n--\nfs/configfs/dir.c-350- attached and not validated yet.\nfs/configfs/dir.c:351: * @sd\t\tconfigfs_dirent of the directory to check\nfs/configfs/dir.c-352- \n--\nfs/configfs/dir.c-354- \nfs/configfs/dir.c:355: * Note: takes configfs_dirent_lock, so the result may change from false to true\nfs/configfs/dir.c-356- * in two consecutive calls, but never from true to false.\nfs/configfs/dir.c-357- /\nfs/configfs/dir.c:358:int configfs_dirent_is_ready(struct configfs_dirent sd)\nfs/configfs/dir.c-359-{\n--\nfs/configfs/dir.c-361-\nfs/configfs/dir.c:362:\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-363-\tret = !(sd-\u003es_type \u0026 CONFIGFS_USET_CREATING);\nfs/configfs/dir.c:364:\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-365-\n--\nfs/configfs/dir.c-368-\nfs/configfs/dir.c:369:int configfs_create_link(struct configfs_dirent target, struct dentry parent,\nfs/configfs/dir.c-370-\t\tstruct dentry dentry, char body)\n--\nfs/configfs/dir.c-373-\tumode_t mode = S_IFLNK \| S_IRWXUGO;\nfs/configfs/dir.c:374:\tstruct configfs_dirent p = parent-\u003ed_fsdata;\nfs/configfs/dir.c-375-\tstruct inode p_inode = d_inode(parent);\n--\nfs/configfs/dir.c-377-\nfs/configfs/dir.c:378:\terr = configfs_make_dirent(p, dentry, target, mode, CONFIGFS_ITEM_LINK,\nfs/configfs/dir.c-379-\t\t\tp-\u003es_frag);\n--\nfs/configfs/dir.c-382-\nfs/configfs/dir.c:383:\tinode = configfs_create(dentry, mode);\nfs/configfs/dir.c-384-\tif (IS_ERR(inode))\n--\nfs/configfs/dir.c-387-\tinode-\u003ei_link = body;\nfs/configfs/dir.c:388:\tinode-\u003ei_op = \u0026configfs_symlink_inode_operations;\nfs/configfs/dir.c-389-\td_make_persistent(dentry, inode);\n--\nfs/configfs/dir.c-393-out_remove:\nfs/configfs/dir.c:394:\tconfigfs_put(dentry-\u003ed_fsdata);\nfs/configfs/dir.c:395:\tconfigfs_remove_dirent(dentry);\nfs/configfs/dir.c-396-\treturn PTR_ERR(inode);\n--\nfs/configfs/dir.c-399-/*\nfs/configfs/dir.c:400: configfs_remove_dir - remove an config_item's directory.\nfs/configfs/dir.c-401- * @d:\tdentry we're removing.\n--\nfs/configfs/dir.c-404- * the directory before we remove the directory, and we've inlined\nfs/configfs/dir.c:405: * what used to be configfs_rmdir() below, instead of calling separately.\nfs/configfs/dir.c-406- \n--\nfs/configfs/dir.c-409-\nfs/configfs/dir.c:410:static void configfs_remove_dir(struct dentry d)\nfs/configfs/dir.c-411-{\n--\nfs/configfs/dir.c-413-\nfs/configfs/dir.c:414:\tconfigfs_remove_dirent(d);\nfs/configfs/dir.c-415-\n--\nfs/configfs/dir.c-420-\t\t\t/\nfs/configfs/dir.c:421:\t\t\t configfs_get_config_item() takes a hashed dentry as\nfs/configfs/dir.c-422-\t\t\t * proof that -\u003es_element is still alive. Our caller\n--\nfs/configfs/dir.c-434-\nfs/configfs/dir.c:435:static struct dentry * configfs_lookup(struct inode dir,\nfs/configfs/dir.c-436-\t\t\t\t struct dentry dentry,\n--\nfs/configfs/dir.c-438-{\nfs/configfs/dir.c:439:\tstruct configfs_dirent * parent_sd = dentry-\u003ed_parent-\u003ed_fsdata;\nfs/configfs/dir.c:440:\tstruct configfs_dirent * sd;\nfs/configfs/dir.c-441-\tstruct inode inode = NULL;\n--\nfs/configfs/dir.c-453-\t /\nfs/configfs/dir.c:454:\tif (!configfs_dirent_is_ready(parent_sd))\nfs/configfs/dir.c-455-\t\treturn ERR_PTR(-ENOENT);\nfs/configfs/dir.c-456-\nfs/configfs/dir.c:457:\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-458-\tlist_for_each_entry(sd, \u0026parent_sd-\u003es_children, s_sibling) {\n--\nfs/configfs/dir.c-460-\t\t/\nfs/configfs/dir.c:461:\t\t s_children is partitioned, see configfs_new_dirent. The first\nfs/configfs/dir.c-462-\t\t * pinned item indicates we can stop scanning.\n--\nfs/configfs/dir.c-471-\t\tif ((sd-\u003es_type \u0026 CONFIGFS_NOT_PINNED) \u0026\u0026\nfs/configfs/dir.c:472:\t\t !strcmp(configfs_get_name(sd), dentry-\u003ed_name.name)) {\nfs/configfs/dir.c:473:\t\t\tstruct configfs_attribute attr = sd-\u003es_element;\nfs/configfs/dir.c-474-\t\t\tumode_t mode = (attr-\u003eca_mode \u0026 S_IALLUGO) \| S_IFREG;\nfs/configfs/dir.c-475-\nfs/configfs/dir.c:476:\t\t\tdentry-\u003ed_fsdata = configfs_get(sd);\nfs/configfs/dir.c-477-\t\t\tsd-\u003es_dentry = dentry;\nfs/configfs/dir.c:478:\t\t\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-479-\nfs/configfs/dir.c:480:\t\t\tinode = configfs_create(dentry, mode);\nfs/configfs/dir.c-481-\t\t\tif (IS_ERR(inode)) {\nfs/configfs/dir.c:482:\t\t\t\tspin_lock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-483-\t\t\t\tsd-\u003es_dentry = NULL;\nfs/configfs/dir.c:484:\t\t\t\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c:485:\t\t\t\tconfigfs_put(sd);\nfs/configfs/dir.c-486-\t\t\t\treturn ERR_CAST(inode);\n--\nfs/configfs/dir.c-489-\t\t\t\tinode-\u003ei_size = 0;\nfs/configfs/dir.c:490:\t\t\t\tinode-\u003ei_fop = \u0026configfs_bin_file_operations;\nfs/configfs/dir.c-491-\t\t\t} else {\nfs/configfs/dir.c-492-\t\t\t\tinode-\u003ei_size = PAGE_SIZE;\nfs/configfs/dir.c:493:\t\t\t\tinode-\u003ei_fop = \u0026configfs_file_operations;\nfs/configfs/dir.c-494-\t\t\t}\n--\nfs/configfs/dir.c-497-\t}\nfs/configfs/dir.c:498:\tspin_unlock(\u0026configfs_dirent_lock);\nfs/configfs/dir.c-499-done:\n--\nfs/configfs/dir.c-508- If there is an error, the caller will reset the flags via\nfs/configfs/dir.c:509: * configfs_detach_rollback().\nfs/configfs/dir.c-510- /\nfs/configfs/dir.c:511:static int configfs_detach_prep(struct configfs_dirent parent_sd, struct dentry *wait)\nfs/configfs/dir.c-512-{\nfs/configfs/dir.c:513:\tstruct configfs_dirent sd;\nfs/configfs/dir.c-514-\tint ret;\n--\nfs/configfs/dir.c-539-\t\t\t /\nfs/configfs/dir.c:540:\t\t\tret = configfs_detach_prep(sd, wait);\nfs/configfs/dir.c-541-\t\t\tif (!ret)\n--\nfs/configfs/dir.c-556- /\n\n" }
29/2	2026/09/16 02:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 47308 output: 19 thoughts: 1224 Thoughts: Analyzing the Dependencies and Impact of These NVMe Target Changes Okay, let's break this down. First, I see that `fs/configfs/mount.c` gets compiled with `CONFIGFS_FS` enabled, and the NVMe target components (`drivers/nvme/target/io-cmd-file.c` and `drivers/nvme/target/passthru.c`) are compiled based on `NVME_TARGET` and `NVME_TARGET_PASSTHRU`, respectively. That much is straightforward. Aha! The `Kconfig` files provide more information. `NVME_TARGET` selects `CONFIGFS_FS`. This is crucial. Also, `NVME_TARGET_PASSTHRU` depends on `NVME_TARGET` and, further, depends on `NVME_CORE` being either directly enabled or selected by `NVME_TARGET`. Right, `NVME_CORE=y \|\| NVME_CORE=NVME_TARGET`. Now, the core of the change: The diff shows additions/modifications to several functions: `nvmet_file_ns_enable`, `nvmet_passthru_ctrl_enable`, and `configfs_path_is_configfs`. The last one is declared in `include/linux/configfs.h`. I'll examine `configfs_path_is_configfs`. ```c bool configfs_path_is_configfs(const struct path path) { return path->dentry->d_sb->s_type == &configfs_fs_type; } EXPORT_SYMBOL_GPL(configfs_path_is_configfs); ``` Simple. It checks if a given `struct path` corresponds to a configfs file system. It's likely checking the superblock type. I'll have to keep this in mind when I read the callers. Looking at how `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` use it is next: In `nvmet_file_ns_enable`: ```c ret = kern_path(ns->device_path, LOOKUP_FOLLOW, &path); if (ret) { pr_err("failed to open file %s: (%d)\n", ns->device_path, ret); return ret; } if (configfs_path_is_configfs(&path)) { pr_err("configfs paths cannot back namespace %s\n", ns->device_path); path_put(&path); return -EINVAL; } ns->file = file_open_root(&path, "", flags, 0); path_put(&path); ``` Ah! `nvmet_file_ns_enable` is rejecting* configfs paths. That makes sense; it's preventing the NVMe target from using configfs as a backing store. This prevents a possible clash and keeps the target system coherent, as expected. My focus symbols are: - `nvmet_file_ns_enable` - `nvmet_passthru_ctrl_enable` - `configfs_path_is_configfs` No other functions seem to be affected, according to the provided diff. No ubiquity here; these functions are fairly specific in their purpose. So, the necessary configs are: `CONFIGFS_FS`, `NVME_TARGET`, and `NVME_TARGET_PASSTHRU`. I also need `NVME_CORE` since `NVME_TARGET_PASSTHRU` depends on it. I need to make sure to configure `NVME_CORE`, and this likely means, looking up, `BLK_DEV_NVME` as well. The dependencies all make sense. This patch prevents configfs paths from being used as backing namespaces for NVMe targets, which is a sensible restriction to maintain integrity.
30/2	2026/09/16 02:42	tool	grepper	0m Args: { "Expression": "config NVME_CORE" } Results: { "Output": "drivers/nvme/host/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/nvme/host/Kconfig:2:config NVME_CORE\ndrivers/nvme/host/Kconfig-3-\ttristate\n" }
31/2	2026/09/16 02:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 49507 output: 19 thoughts: 13 Thoughts: Okay, here's my interpretation of those thoughts, crafted with the understanding that I'm speaking to a fellow expert: Tracing the NVMe_CORE Activation Path Alright, so the initial thought process here is pretty straightforward. I'm hitting a point where I need to dig into the system and understand the control flow. My mental map is currently blank on precisely what enables or selects the NVME_CORE functionality. This isn't a "how does NVMe work" question, this is far more granular. I'm focusing on the activation, the specific mechanisms by which the core NVMe module gets hooked into the operating system and starts doing its thing. It's about nailing down the trigger, the dependencies, the build flags, the initialization routines... basically, the entire sequence of events that brings NVMe_CORE from a dormant state to operational. So, I'm thinking, where do I start my investigation? The goal is to efficiently locate the relevant code paths. The question is a call to action. The starting point is to find the places where the NVME_CORE option is either selected in a configuration, or enabled, presumably through a runtime process.
32/2	2026/09/16 02:42	tool	grepper	0m Args: { "Expression": "select NVME_CORE" } Results: { "Output": "drivers/nvme/host/Kconfig=5=config BLK_DEV_NVME\n--\ndrivers/nvme/host/Kconfig-7-\tdepends on PCI \u0026\u0026 BLOCK\ndrivers/nvme/host/Kconfig:8:\tselect NVME_CORE\ndrivers/nvme/host/Kconfig-9-\thelp\n--\ndrivers/nvme/host/Kconfig=47=config NVME_FABRICS\ndrivers/nvme/host/Kconfig:48:\tselect NVME_CORE\ndrivers/nvme/host/Kconfig-49-\tselect NVME_KEYRING if NVME_TCP_TLS\n--\ndrivers/nvme/host/Kconfig=125=config NVME_APPLE\n--\ndrivers/nvme/host/Kconfig-129-\tdepends on ARCH_APPLE \|\| COMPILE_TEST\ndrivers/nvme/host/Kconfig:130:\tselect NVME_CORE\ndrivers/nvme/host/Kconfig-131-\thelp\n" }
33/2	2026/09/16 02:42	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 50034 output: 201 thoughts: 1359 Thoughts: NVMe Target Configuration and Fuzzing Strategy Okay, so here's the breakdown of my thought process on this NVMe target configuration and how it relates to fuzzing. First, I'm noting the relationships between the various Kconfig options: `BLK_DEV_NVME` selects `NVME_CORE`, `NVME_TARGET_LOOP` selects `NVME_FABRICS`, which also selects `NVME_CORE`. The key is that enabling `NVME_CORE` and `NVME_TARGET` lets me also enable `NVME_TARGET_PASSTHRU`, and crucially, `CONFIGFS_FS` is selected by `NVME_TARGET`. My initial list of configs is: `CONFIGFS_FS`, `NVME_TARGET`, `NVME_TARGET_PASSTHRU`, and `BLK_DEV_NVME`. Now, `BLK_DEV_NVME` is the standard NVMe driver, specifically for amd64. `NVME_TARGET` relies on `BLOCK`. `NVME_TARGET_PASSTHRU` depends on `NVME_TARGET` and either `NVME_CORE` or `NVME_TARGET`. So, the list still holds. The critical question now is whether a transport is even required for namespaces and passthrough controllers in the NVMe target. I need to know if I can enable them without a specific transport. I dive into the code. Looking at `nvmet_ns_enable_store`, I see the `nvmet_ns_enable` function is called when a "1" is written to `/sys/kernel/config/nvmet/subsystems/<subsys>/namespaces/<ns>/enable`. Within `nvmet_ns_enable`, there's a check to prevent enabling both regular and passthru namespaces. But what's really interesting is that if `ns->device_path` isn't a block device, it can call `nvmet_file_ns_enable()`. And, similarly, writing "1" to `/sys/kernel/config/nvmet/subsystems/<subsys>/passthru/enable` executes `nvmet_passthru_ctrl_enable()`. So, it's confirmed: no transport is needed. I'm seeing that both functions now use `kern_path()`, `configfs_path_is_configfs()`, and `file_open_root()`. This is important. This is a change in the file path lookup (from `filp_open()` to `kern_path()` with validation plus `file_open_root()`), and it also adds a check against configfs backing storage to prevent potential recursive calls. This is critical because this code is reachable executable code. It's executed via standard configfs sysfs/VFS interactions. Therefore, `WorthFuzzing = true`. I now double-check the required fields for the "set-results" structure. - `WorthFuzzing`: true (as confirmed) - `Reasoning`: The patch introduces the `configfs_path_is_configfs` check to prevent recursive issues in the NVMe target file-backed namespaces and passthru controllers from using configfs paths as backing files. This patch refactors `filp_open` to `kern_path` with validation and `file_open_root`. The relevant code is located in `drivers/nvme/target` and `fs/configfs` and is reachable from userspace via configfs operations (`/sys/kernel/config/nvmet/...`). - `FocusSymbols`: `nvmet_file_ns_enable`, `nvmet_passthru_ctrl_enable`, and `configfs_path_is_configfs`. These are the key functions to target. - `EnableConfigs`: `CONFIGFS_FS`, `NVME_TARGET`, `NVME_TARGET_PASSTHRU`, and `BLK_DEV_NVME`. These are the configurations that need to be enabled to expose the functionality. Everything is clear, concise, and satisfies all the requirements.
34/2	2026/09/16 02:42	tool	set-results	0m Args: { "EnableConfigs": [ "CONFIGFS_FS", "NVME_TARGET", "NVME_TARGET_PASSTHRU", "BLK_DEV_NVME" ], "FocusSymbols": [ "nvmet_file_ns_enable", "nvmet_passthru_ctrl_enable", "configfs_path_is_configfs" ], "Reasoning": "The patch introduces configfs_path_is_configfs() and replaces filp_open() with kern_path() + file_open_root() in nvmet_file_ns_enable() and nvmet_passthru_ctrl_enable() to prevent configfs files from backing NVMe target namespaces or passthru controllers. This modifies reachable path lookup and file opening logic that is accessible from userspace via configfs writes to /sys/kernel/config/nvmet/.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "CONFIGFS_FS", "NVME_TARGET", "NVME_TARGET_PASSTHRU", "BLK_DEV_NVME" ], "FocusSymbols": [ "nvmet_file_ns_enable", "nvmet_passthru_ctrl_enable", "configfs_path_is_configfs" ], "Reasoning": "The patch introduces configfs_path_is_configfs() and replaces filp_open() with kern_path() + file_open_root() in nvmet_file_ns_enable() and nvmet_passthru_ctrl_enable() to prevent configfs files from backing NVMe target namespaces or passthru controllers. This modifies reachable path lookup and file opening logic that is accessible from userspace via configfs writes to /sys/kernel/config/nvmet/.", "WorthFuzzing": true }
35/1	2026/09/16 02:42	action	If	0m Args: { "WorthFuzzing": true } Results: null
36/2	2026/09/16 02:42	agent	kmsan-evaluator	0m Model: core Args: null Results: { "KMSANReasoning": "The patch series prevents NVMe target namespaces and passthru controllers from using backing files residing in configfs (which prevents recursion, deadlocks, and refcount issues). It introduces a helper `configfs_path_is_configfs` and replaces `filp_open` with `kern_path()`, validation, and `file_open_root()`.\n\nKMSAN vs KASAN applicability:\n- The stack-allocated `struct path path` in both `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` is only accessed after `kern_path()` returns success (0), guaranteeing full initialization before reading or releasing.\n- No data is copied to user space or exposed via ioctls/attributes, eliminating any risk of info-leaks.\n- There are no uninitialized variables, conditional branches on undefined data, or partial struct initializations.\n- Any potential issues in this patch (e.g., refcounting with `path_put`, locking, or invalid pointer dereferences) are caught by KASAN and standard kernel debuggers (LOCKDEP/refcount_t checking).\n\nTherefore, 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 66f39a483bed994e5175a582619864f05251d3eb Author: syz-cluster <triage@syzkaller.com> Date: Wed Sep 16 02:41:04 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c index 0b22d183f9279..fbe58aa4a85ac 100644 --- a/drivers/nvme/target/io-cmd-file.c +++ b/drivers/nvme/target/io-cmd-file.c @@ -8,7 +8,9 @@ #include <linux/uio.h> #include <linux/falloc.h> #include <linux/file.h> +#include <linux/configfs.h> #include <linux/fs.h> +#include <linux/namei.h> #include "nvmet.h" #define NVMET_MIN_MPOOL_OBJ 16 @@ -33,12 +35,28 @@ void nvmet_file_ns_disable(struct nvmet_ns ns) int nvmet_file_ns_enable(struct nvmet_ns ns) { int flags = O_RDWR \| O_LARGEFILE; + struct path path; int ret = 0; if (!ns->buffered_io) flags \|= O_DIRECT; - ns->file = filp_open(ns->device_path, flags, 0); + ret = kern_path(ns->device_path, LOOKUP_FOLLOW, &path); + if (ret) { + pr_err("failed to open file %s: (%d)\n", + ns->device_path, ret); + return ret; + } + + if (configfs_path_is_configfs(&path)) { + pr_err("configfs paths cannot back namespace %s\n", + ns->device_path); + path_put(&path); + return -EINVAL; + } + + ns->file = file_open_root(&path, "", flags, 0); + path_put(&path); if (IS_ERR(ns->file)) { ret = PTR_ERR(ns->file); pr_err("failed to open file %s: (%d)\n", diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c index fa6527c537e26..aa1778c9ee28d 100644 --- a/drivers/nvme/target/passthru.c +++ b/drivers/nvme/target/passthru.c @@ -9,6 +9,8 @@ / #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> +#include <linux/configfs.h> +#include <linux/namei.h> #include "../host/nvme.h" #include "nvmet.h" @@ -588,6 +590,7 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys) { struct nvme_ctrl ctrl; struct file file; + struct path path; int ret = -EINVAL; void old; @@ -602,7 +605,19 @@ int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys) goto out_unlock; } - file = filp_open(subsys->passthru_ctrl_path, O_RDWR, 0); + ret = kern_path(subsys->passthru_ctrl_path, LOOKUP_FOLLOW, &path); + if (ret) + goto out_unlock; + + if (configfs_path_is_configfs(&path)) { + pr_err("configfs paths cannot back passthru controller %s\n", + subsys->passthru_ctrl_path); + path_put(&path); + goto out_unlock; + } + + file = file_open_root(&path, "", O_RDWR, 0); + path_put(&path); if (IS_ERR(file)) { ret = PTR_ERR(file); goto out_unlock; diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c index d8cac1cbf3bd5..8abbe3afaa5eb 100644 --- a/fs/configfs/mount.c +++ b/fs/configfs/mount.c @@ -118,6 +118,12 @@ static struct file_system_type configfs_fs_type = { }; MODULE_ALIAS_FS("configfs"); +bool configfs_path_is_configfs(const struct path path) +{ + return path->dentry->d_sb->s_type == &configfs_fs_type; +} +EXPORT_SYMBOL_GPL(configfs_path_is_configfs); + struct dentry configfs_pin_fs(void) { int err = simple_pin_fs(&configfs_fs_type, &configfs_mount, diff --git a/include/linux/configfs.h b/include/linux/configfs.h index ef65c75beeaad..55df734da634b 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -34,6 +34,7 @@ struct configfs_group_operations; struct configfs_attribute; struct configfs_bin_attribute; struct configfs_subsystem; +struct path; struct config_item { char ci_name; @@ -243,6 +244,7 @@ void configfs_unregister_subsystem(struct configfs_subsystem subsys); int configfs_register_group(struct config_group parent_group, struct config_group group); void configfs_unregister_group(struct config_group group); +bool configfs_path_is_configfs(const struct path path); void configfs_remove_default_groups(struct config_group *group);
37/3	2026/09/16 02:42	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3461 output: 19 thoughts: 1014 Thoughts: KMSAN Fuzzing Session Justification: NVMe Target Patch Analysis Alright, let's break down this patch series and decide if it warrants a dedicated KMSAN fuzzing session. My initial thought is to analyze the changes and identify potential memory safety issues, especially since we're dealing with file path handling and potentially problematic interactions with `configfs`. First, the patch alters two key NVMe target drivers: `io-cmd-file.c` and `passthru.c`. The core change involves replacing direct calls to `filp_open` with a sequence using `kern_path` and `file_open_root`. The goal, I see, is to prevent users from accidentally configuring NVMe namespaces or passthru controllers to paths within `configfs`. This is a crucial safety measure; it's designed to avoid deadlocks or other filesystem corruption scenarios that can occur when the system tries to access a configfs file while it's being configured. The use of `configfs_path_is_configfs` to explicitly check if the path is within the configfs is a good safety check. The patch includes the `configfs_path_is_configfs` function and the necessary `struct path` declarations in `configfs.h`. This is just the supporting code required for the safety check. The rationale is clear: prevent users from shooting themselves in the foot by accidentally creating recursive configuration loops or other undesirable situations within the filesystem. That said, I need to make sure this doesn't introduce any new vulnerabilities. Now, let's scrutinize the potential memory safety implications. I've already scanned for obvious issues, such as uninitialized memory reads or writes. `kern_path` is the first key function. Based on the code, if `kern_path` fails, it returns an error, preventing `path` from being used. On success, `kern_path` initializes the `path` structure. Then, the path struct is used by `configfs_path_is_configfs` and then `file_open_root`. I've determined the following: * No user-space data exposure: The patch doesn't introduce or change any kernel structures sent to user space directly. * No conditional logic dependent on uninitialized variables: The `ret` variable is initialized before use in `kern_path`. Then conditional branching ensures correct `path` use. * No complex structure allocations: No new complex structures are allocated by this patch. * No bounds checks or length logic concerns: No concerns. * No direct uninitialized memory reads: The patch does not read uninitialized memory directly. Given that I don't see any obvious, direct memory safety risks in the patched code itself, let's now look deeper at the behavior of `kern_path` and, in particular, `file_open_root`. I'll need to confirm that these functions, and how they interact, are safe in the context of this specific use case, especially considering potential filesystem race conditions or unexpected side effects. I'm going to do a quick `grep` for `file_open_root` in the kernel to refresh my memory on the intricacies of that function. At this point, I don't see any immediate red flags, but I want to make certain that there are not deeper subtle interactions, so a grep search of the codebase would be useful. If my deeper dive into the kernel code yields no specific concerns, then my preliminary conclusion is that the patch improves memory safety by preventing a known class of filesystem deadlocks and doesn't introduce any new immediate vulnerabilities. However, the complexity of filesystem interactions means that a targeted KMSAN session might still be beneficial. I need more information to assess the value of a targeted session.
38/3	2026/09/16 02:42	tool	grepper	0m Args: { "Expression": "file_open_root" } Results: { "Output": "Documentation/filesystems/path-lookup.rst=428=the calling process. An alternate root can be provided as when\nDocumentation/filesystems/path-lookup.rst:429:``sysctl()`` calls ``file_open_root()``, and when NFSv4 or Btrfs call\nDocumentation/filesystems/path-lookup.rst-430-``mount_subtree()``. In each case a pathname is being looked up in a very\n--\nDocumentation/filesystems/path-lookup.rst=655=filename_parentat(),\nDocumentation/filesystems/path-lookup.rst:656:do_filp_open(), and do_file_open_root(). These four\nDocumentation/filesystems/path-lookup.rst-657-correspond roughly to the three ``path_()`` functions we met earlier,\n--\nDocumentation/filesystems/porting.rst=899=only a part of obtained data, you should do iov_iter_revert().\n--\nDocumentation/filesystems/porting.rst-904-\nDocumentation/filesystems/porting.rst:905:Calling conventions for file_open_root() changed; now it takes struct path \nDocumentation/filesystems/porting.rst-906-instead of passing mount and dentry separately. For callers that used to\nDocumentation/filesystems/porting.rst=907=pass \u003cmnt, mnt-\u003emnt_root\u003e pair (i.e. the root of given mount), a new helper\nDocumentation/filesystems/porting.rst:908:is provided - file_open_root_mnt(). In-tree users adjusted.\nDocumentation/filesystems/porting.rst-909-\n--\narch/um/drivers/mconsole_kern.c=127=void mconsole_proc(struct mc_request req)\n--\narch/um/drivers/mconsole_kern.c-143-\t}\narch/um/drivers/mconsole_kern.c:144:\tfile = file_open_root_mnt(mnt, ptr, O_RDONLY, 0);\narch/um/drivers/mconsole_kern.c-145-\tif (IS_ERR(file)) {\n--\ndrivers/nvme/target/io-cmd-file.c=35=int nvmet_file_ns_enable(struct nvmet_ns ns)\n--\ndrivers/nvme/target/io-cmd-file.c-57-\ndrivers/nvme/target/io-cmd-file.c:58:\tns-\u003efile = file_open_root(\u0026path, \"\", flags, 0);\ndrivers/nvme/target/io-cmd-file.c-59-\tpath_put(\u0026path);\n--\ndrivers/nvme/target/passthru.c=589=int nvmet_passthru_ctrl_enable(struct nvmet_subsys subsys)\n--\ndrivers/nvme/target/passthru.c-618-\ndrivers/nvme/target/passthru.c:619:\tfile = file_open_root(\u0026path, \"\", O_RDWR, 0);\ndrivers/nvme/target/passthru.c-620-\tpath_put(\u0026path);\n--\nfs/fhandle.c=416=static struct file file_open_handle(struct path path, int open_flag)\n--\nfs/fhandle.c-423-\nfs/fhandle.c:424:\treturn file_open_root(path, \"\", open_flag, 0);\nfs/fhandle.c-425-}\n--\nfs/internal.h=194=extern struct file do_file_open(int dfd, struct filename pathname,\nfs/internal.h-195-\t\tconst struct open_flags op);\nfs/internal.h:196:extern struct file do_file_open_root(const struct path ,\nfs/internal.h-197-\t\tconst char , const struct open_flags );\n--\nfs/namei.c=5097=struct file do_file_open(int dfd, struct filename pathname,\n--\nfs/namei.c-5115-\nfs/namei.c:5116:struct file do_file_open_root(const struct path root,\nfs/namei.c-5117-\t\tconst char name, const struct open_flags op)\n--\nfs/nsfs.c=650=static struct file nsfs_export_open(const struct path path, unsigned int oflags)\nfs/nsfs.c-651-{\nfs/nsfs.c:652:\treturn file_open_root(path, \"\", oflags, 0);\nfs/nsfs.c-653-}\n--\nfs/open.c=1429=EXPORT_SYMBOL(filp_open);\nfs/open.c-1430-\nfs/open.c:1431:struct file file_open_root(const struct path root,\nfs/open.c-1432-\t\t\t const char filename, int flags, umode_t mode)\n--\nfs/open.c-1438-\t\treturn ERR_PTR(err);\nfs/open.c:1439:\treturn do_file_open_root(root, filename, \u0026op);\nfs/open.c-1440-}\nfs/open.c:1441:EXPORT_SYMBOL(file_open_root);\nfs/open.c-1442-\n--\nfs/proc/proc_sysctl.c=1614=static int process_sysctl_arg(char param, char val,\n--\nfs/proc/proc_sysctl.c-1671-\nfs/proc/proc_sysctl.c:1672:\tfile = file_open_root_mnt(proc_mnt, path, O_WRONLY, 0);\nfs/proc/proc_sysctl.c-1673-\tif (IS_ERR(file)) {\n--\ninclude/linux/exportfs.h=170=struct handle_to_path_ctx {\n--\ninclude/linux/exportfs.h-255- * Allow filesystems to specify a custom open function for the\ninclude/linux/exportfs.h:256: * open_by_handle_at(2) syscall instead of the default file_open_root().\ninclude/linux/exportfs.h-257- * This custom open function is not respected by nfsd.\n--\ninclude/linux/fs.h=2493=extern struct file filp_open(const char , int, umode_t);\ninclude/linux/fs.h:2494:extern struct file file_open_root(const struct path ,\ninclude/linux/fs.h-2495-\t\t\t\t const char , int, umode_t);\ninclude/linux/fs.h:2496:static inline struct file file_open_root_mnt(struct vfsmount mnt,\ninclude/linux/fs.h-2497-\t\t\t\t const char name, int flags, umode_t mode)\ninclude/linux/fs.h-2498-{\ninclude/linux/fs.h:2499:\treturn file_open_root(\u0026(struct path){.mnt = mnt, .dentry = mnt-\u003emnt_root},\ninclude/linux/fs.h-2500-\t\t\t name, flags, mode);\n" }
39/3	2026/09/16 02:42	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7132 output: 41 thoughts: 30 Thoughts: Okay, here's my take on those code changes, rendered as if they're my internal thought process. Diving Deep into NVMe Target Code Alright, time to roll up my sleeves and really dig into these `drivers/nvme/target/io-cmd-file.c` and `passthru.c` modifications. I need to understand the nuances of these changes – they likely have pretty significant implications for NVMe target behavior. I'm going to start by comparing the versions, line by line if necessary. What's changed in how these files handle I/O command dispatch and, especially, any direct passthrough calls? Are we seeing improvements in performance, security, or perhaps the handling of specific NVMe features? I'll be looking for clues in the function calls, the data structures used, and the overall logic flow. Are we talking about enhancements in error handling, queue management, or maybe even new capabilities for managing file-backed NVMe namespaces? I'll pay close attention to the lock usage and synchronization primitives to rule out potential race conditions or performance bottlenecks. Specifically, I'll analyze how the passthrough functionality is integrated with the file-based I/O operations – any added security checks? Are we streamlining the interaction with the host controller or are we perhaps introducing a new abstraction layer? It’s crucial to understand how this impacts the overall system's response time and resource consumption. Ultimately, I need a very clear picture of the intent behind these changes and their potential impact on the NVMe target's stability, performance, and overall feature set. Let's get to it.
40/3	2026/09/16 02:42	tool	read-file	0m Args: { "File": "drivers/nvme/target/io-cmd-file.c", "FirstLine": 30, "LineCount": 45 } Results: { "Contents": " 30:\t\t\tfput(ns-\u003efile);\n 31:\t\t\tns-\u003efile = NULL;\n 32:\t\t}\n 33:\t}\n 34:\t\n 35:\tint nvmet_file_ns_enable(struct nvmet_ns ns)\n 36:\t{\n 37:\t\tint flags = O_RDWR \| O_LARGEFILE;\n 38:\t\tstruct path path;\n 39:\t\tint ret = 0;\n 40:\t\n 41:\t\tif (!ns-\u003ebuffered_io)\n 42:\t\t\tflags \|= O_DIRECT;\n 43:\t\n 44:\t\tret = kern_path(ns-\u003edevice_path, LOOKUP_FOLLOW, \u0026path);\n 45:\t\tif (ret) {\n 46:\t\t\tpr_err(\"failed to open file %s: (%d)\\n\",\n 47:\t\t\t ns-\u003edevice_path, ret);\n 48:\t\t\treturn ret;\n 49:\t\t}\n 50:\t\n 51:\t\tif (configfs_path_is_configfs(\u0026path)) {\n 52:\t\t\tpr_err(\"configfs paths cannot back namespace %s\\n\",\n 53:\t\t\t ns-\u003edevice_path);\n 54:\t\t\tpath_put(\u0026path);\n 55:\t\t\treturn -EINVAL;\n 56:\t\t}\n 57:\t\n 58:\t\tns-\u003efile = file_open_root(\u0026path, \"\", flags, 0);\n 59:\t\tpath_put(\u0026path);\n 60:\t\tif (IS_ERR(ns-\u003efile)) {\n 61:\t\t\tret = PTR_ERR(ns-\u003efile);\n 62:\t\t\tpr_err(\"failed to open file %s: (%d)\\n\",\n 63:\t\t\t\tns-\u003edevice_path, ret);\n 64:\t\t\tns-\u003efile = NULL;\n 65:\t\t\treturn ret;\n 66:\t\t}\n 67:\t\n 68:\t\tnvmet_file_ns_revalidate(ns);\n 69:\t\n 70:\t\t/\n 71:\t\t * i_blkbits can be greater than the universally accepted upper bound,\n 72:\t\t * so make sure we export a sane namespace lba_shift.\n 73:\t\t */\n 74:\t\tns-\u003eblksize_shift = min_t(u8,\n" }
41/3	2026/09/16 02:42	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8133 output: 40 thoughts: 19 Thoughts: Here's a summary of my thought process, as if I were the one thinking it: Diving into the NVMe Passthrough Implementation Okay, time to dig into this. I'm going to start by examining the `drivers/nvme/target/passthru.c` file. Given what I'm looking for, this seems like the logical place to start. I expect to find the core logic for how the NVMe target handles commands that are passed directly through to the underlying NVMe device. I'm anticipating seeing the command processing flow, interrupt handling (potentially), and any specific checks or configurations related to passthrough mode. Let's see what's actually in there.
42/3	2026/09/16 02:42	tool	read-file	0m Args: { "File": "drivers/nvme/target/passthru.c", "FirstLine": 595, "LineCount": 45 } Results: { "Contents": " 595:\t\tvoid *old;\n 596:\t\n 597:\t\tmutex_lock(\u0026subsys-\u003elock);\n 598:\t\tif (!subsys-\u003epassthru_ctrl_path)\n 599:\t\t\tgoto out_unlock;\n 600:\t\tif (subsys-\u003epassthru_ctrl)\n 601:\t\t\tgoto out_unlock;\n 602:\t\n 603:\t\tif (subsys-\u003enr_namespaces) {\n 604:\t\t\tpr_info(\"cannot enable both passthru and regular namespaces for a single subsystem\");\n 605:\t\t\tgoto out_unlock;\n 606:\t\t}\n 607:\t\n 608:\t\tret = kern_path(subsys-\u003epassthru_ctrl_path, LOOKUP_FOLLOW, \u0026path);\n 609:\t\tif (ret)\n 610:\t\t\tgoto out_unlock;\n 611:\t\n 612:\t\tif (configfs_path_is_configfs(\u0026path)) {\n 613:\t\t\tpr_err(\"configfs paths cannot back passthru controller %s\\n\",\n 614:\t\t\t subsys-\u003epassthru_ctrl_path);\n 615:\t\t\tpath_put(\u0026path);\n 616:\t\t\tgoto out_unlock;\n 617:\t\t}\n 618:\t\n 619:\t\tfile = file_open_root(\u0026path, \"\", O_RDWR, 0);\n 620:\t\tpath_put(\u0026path);\n 621:\t\tif (IS_ERR(file)) {\n 622:\t\t\tret = PTR_ERR(file);\n 623:\t\t\tgoto out_unlock;\n 624:\t\t}\n 625:\t\n 626:\t\tctrl = nvme_ctrl_from_file(file);\n 627:\t\tif (!ctrl) {\n 628:\t\t\tpr_err(\"failed to open nvme controller %s\\n\",\n 629:\t\t\t subsys-\u003epassthru_ctrl_path);\n 630:\t\n 631:\t\t\tgoto out_put_file;\n 632:\t\t}\n 633:\t\n 634:\t\told = xa_cmpxchg(\u0026passthru_subsystems, ctrl-\u003einstance, NULL,\n 635:\t\t\t\t subsys, GFP_KERNEL);\n 636:\t\tif (xa_is_err(old)) {\n 637:\t\t\tret = xa_err(old);\n 638:\t\t\tgoto out_put_file;\n 639:\t\t}\n" }
43/3	2026/09/16 02:42	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8997 output: 36 thoughts: 12 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: Navigating the Configuration Filesystem Mount Logic Right, so I'm digging into this... specifically, I need to understand how the configuration filesystem actually gets mounted. And the first place my mind jumps to is the core mount logic. I need to be absolutely sure I'm following the correct path, so I'm heading straight for the `fs/configfs/mount.c` file. That's usually the heart of the matter for these kinds of systems. That file is where the action is. This should hold the key.
44/3	2026/09/16 02:42	tool	read-file	0m Args: { "File": "fs/configfs/mount.c", "FirstLine": 110, "LineCount": 30 } Results: { "Contents": " 110:\t\treturn 0;\n 111:\t}\n 112:\t\n 113:\tstatic struct file_system_type configfs_fs_type = {\n 114:\t\t.owner\t\t= THIS_MODULE,\n 115:\t\t.name\t\t= \"configfs\",\n 116:\t\t.init_fs_context = configfs_init_fs_context,\n 117:\t\t.kill_sb\t= kill_anon_super,\n 118:\t};\n 119:\tMODULE_ALIAS_FS(\"configfs\");\n 120:\t\n 121:\tbool configfs_path_is_configfs(const struct path path)\n 122:\t{\n 123:\t\treturn path-\u003edentry-\u003ed_sb-\u003es_type == \u0026configfs_fs_type;\n 124:\t}\n 125:\tEXPORT_SYMBOL_GPL(configfs_path_is_configfs);\n 126:\t\n 127:\tstruct dentry configfs_pin_fs(void)\n 128:\t{\n 129:\t\tint err = simple_pin_fs(\u0026configfs_fs_type, \u0026configfs_mount,\n 130:\t\t\t\t \u0026configfs_mnt_count);\n 131:\t\treturn err ? ERR_PTR(err) : configfs_mount-\u003emnt_root;\n 132:\t}\n 133:\t\n 134:\tvoid configfs_release_fs(void)\n 135:\t{\n 136:\t\tsimple_release_fs(\u0026configfs_mount, \u0026configfs_mnt_count);\n 137:\t}\n 138:\t\n 139:\t\n" }
45/3	2026/09/16 02:42	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9633 output: 281 thoughts: 958 Thoughts: KMSAN Assessment: Confirmed False Okay, let's break this down meticulously. We're looking at whether this patch necessitates KMSAN. My initial read suggests it doesn't, but we need to verify rigorously against the defined criteria. The patch introduces a new helper, `configfs_path_is_configfs`, which immediately raises my attention. It checks if a given `path` is within the configfs filesystem. It uses `path->dentry->d_sb->s_type`, which, if `kern_path` returns success, is valid since `kern_path` is expected to populate the `path` struct with a valid `dentry`, `d_sb` etc. In `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable`, the patch replaces `filp_open` with a sequence of `kern_path`, then our `configfs_path_is_configfs` check, and finally `file_open_root`. The critical point is the error handling. If `kern_path` fails (returns a non-zero `ret`), the code correctly bails out before touching the `path` structure. If `kern_path` succeeds, `path` is populated as a result of VFS path lookup routines. `path_put` then releases the reference. Thinking through the criteria: * Criterion 1 (Kernel structures to userspace): Nope. No data from the kernel is being copied to userspace directly. The patch focuses on preventing the target from opening a file within configfs. * Criterion 2 (Uninitialized variables and conditionals): Absolutely not. The `path` struct, a stack variable, is only read after `kern_path` successfully populates it, or in the case of an error is not read at all. The branching logic depends on the return value of `kern_path`, which is fully initialized. The logic flow is simple: if path exists, perform some operations. * Criterion 3 (Complex data structures and initialization): There aren't any complex data structures being allocated or initialized here that have any risk of uninitialized fields. * Criterion 4 (Bounds checks and uninitialized bytes): The patch's purpose is to prevent access, but not change existing accesses, so this is not a concern. The logic prevents accessing the backing file. Therefore, the patch doesn't introduce or modify any code that could lead to uninitialized memory being used, or leaked. The goal is to prevent a path from the NVMe target, and this is achieved through the use of an existing kernel helper, `kern_path`, combined with the new helper. Standard KASAN/LOCKDEP/etc. should cover any other memory concerns. Let's do a final, double-check: In `nvmet_file_ns_enable`, the `path` struct is stack allocated, `kern_path` is called, and a return is performed if `kern_path` fails without touching `path`. If `kern_path` succeeds, a path is provided to `file_open_root`, and finally the path is released by `path_put`. In `nvmet_passthru_ctrl_enable`, it follows the exact same logic. `configfs_path_is_configfs` accesses only initialized fields of the `path` struct. No data is exposed to user space. There's no risk. I am completely confident. `NeedsKMSAN = false`. We're ready to submit.
46/3	2026/09/16 02:43	tool	set-results	0m Args: { "KMSANReasoning": "The patch series prevents NVMe target namespaces and passthru controllers from using backing files residing in configfs (which prevents recursion, deadlocks, and refcount issues). It introduces a helper `configfs_path_is_configfs` and replaces `filp_open` with `kern_path()`, validation, and `file_open_root()`.\n\nKMSAN vs KASAN applicability:\n- The stack-allocated `struct path path` in both `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` is only accessed after `kern_path()` returns success (0), guaranteeing full initialization before reading or releasing.\n- No data is copied to user space or exposed via ioctls/attributes, eliminating any risk of info-leaks.\n- There are no uninitialized variables, conditional branches on undefined data, or partial struct initializations.\n- Any potential issues in this patch (e.g., refcounting with `path_put`, locking, or invalid pointer dereferences) are caught by KASAN and standard kernel debuggers (LOCKDEP/refcount_t checking).\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch series prevents NVMe target namespaces and passthru controllers from using backing files residing in configfs (which prevents recursion, deadlocks, and refcount issues). It introduces a helper `configfs_path_is_configfs` and replaces `filp_open` with `kern_path()`, validation, and `file_open_root()`.\n\nKMSAN vs KASAN applicability:\n- The stack-allocated `struct path path` in both `nvmet_file_ns_enable` and `nvmet_passthru_ctrl_enable` is only accessed after `kern_path()` returns success (0), guaranteeing full initialization before reading or releasing.\n- No data is copied to user space or exposed via ioctls/attributes, eliminating any risk of info-leaks.\n- There are no uninitialized variables, conditional branches on undefined data, or partial struct initializations.\n- Any potential issues in this patch (e.g., refcounting with `path_put`, locking, or invalid pointer dereferences) are caught by KASAN and standard kernel debuggers (LOCKDEP/refcount_t checking).\n\nTherefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false }

LLM Calls Summary:
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Tool Calls Summary:
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