| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/11/02 10:48 | flow | patch-triage |
5mArgs:null Results: {
"EnableConfigs": [
"INFINIBAND_SRP",
"INFINIBAND",
"INFINIBAND_ADDR_TRANS",
"SCSI"
],
"FocusSymbols": [
"srp_recv_done",
"srp_cm_rep_handler",
"srp_ib_cm_handler",
"srp_rdma_cm_handler"
],
"KMSANReasoning": "The patch addresses a potential out-of-bounds access and DMA sync length mismatch in the InfiniBand SRP driver:\n1. In `srp_cm_rep_handler`, it adds a bounds check ensuring that `ch-\u003emax_ti_iu_len` is at least `sizeof(struct srp_rsp)`, preventing subsequent out-of-bounds access when processing response headers in `iu-\u003ebuf`. Out-of-bounds reads and writes are detected by KASAN.\n2. In `srp_recv_done`, it updates the DMA sync length to use `iu-\u003esize` instead of `ch-\u003emax_ti_iu_len`. The underlying buffer is allocated with `kzalloc()`, and DMA sync operations deal with cache coherency rather than uninitialized memory tracking.\n\nThe changes do not touch any kernel-to-user copy interfaces, do not introduce uninitialized stack or heap variables, and do not introduce control flow dependent on uninitialized data. Therefore, standard KASAN and DMA debugging are appropriate, and a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false,
"Reasoning": "The patch modifies the SCSI RDMA Protocol (SRP) initiator driver (drivers/infiniband/ulp/srp/ib_srp.c). Specifically, it updates DMA buffer sync sizes in srp_recv_done() and adds validation logic in srp_cm_rep_handler() to check that target-reported max_ti_iu_len is large enough for a struct srp_rsp. SRP is reachable in virtualized environments via software RDMA transports (e.g. rdma_rxe, siw) over standard network devices and sysfs configuration. Therefore, this represents reachable protocol handling and validation logic that warrants fuzzing.",
"WorthFuzzing": true
} |
| 1/1 | 2026/11/02 10:48 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 32ec8b0a0d47355606a8a93ea4e70d6e6a526de9\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Nov 2 10:47:59 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c\nindex 5811f02df98053..159d6b6aa93e3a 100644\n--- a/drivers/infiniband/ulp/srp/ib_srp.c\n+++ b/drivers/infiniband/ulp/srp/ib_srp.c\n@@ -2111,7 +2111,7 @@ static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\n \t\treturn;\n \t}\n \n-\tib_dma_sync_single_for_cpu(dev, iu-\u003edma, ch-\u003emax_ti_iu_len,\n+\tib_dma_sync_single_for_cpu(dev, iu-\u003edma, iu-\u003esize,\n \t\t\t\t DMA_FROM_DEVICE);\n \n \topcode = *(u8 *) iu-\u003ebuf;\n@@ -2148,7 +2148,7 @@ static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\n \t\tbreak;\n \t}\n \n-\tib_dma_sync_single_for_device(dev, iu-\u003edma, ch-\u003emax_ti_iu_len,\n+\tib_dma_sync_single_for_device(dev, iu-\u003edma, iu-\u003esize,\n \t\t\t\t DMA_FROM_DEVICE);\n \n \tres = srp_post_recv(ch, iu);\n@@ -2379,6 +2379,13 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,\n \n \tif (lrsp-\u003eopcode == SRP_LOGIN_RSP) {\n \t\tch-\u003emax_ti_iu_len = be32_to_cpu(lrsp-\u003emax_ti_iu_len);\n+\t\tif (ch-\u003emax_ti_iu_len \u003c sizeof(struct srp_rsp)) {\n+\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host, PFX\n+\t\t\t\t \"Target reported max_ti_iu_len %u, too small for a %zu byte SRP_RSP\\n\",\n+\t\t\t\t ch-\u003emax_ti_iu_len, sizeof(struct srp_rsp));\n+\t\t\tret = -ECONNRESET;\n+\t\t\tgoto error;\n+\t\t}\n \t\tch-\u003ereq_lim = be32_to_cpu(lrsp-\u003ereq_lim_delta);\n \t\tch-\u003euse_imm_data = srp_use_imm_data \u0026\u0026\n \t\t\t(lrsp-\u003ersp_flags \u0026 SRP_LOGIN_RSP_IMMED_SUPP);\n"
} |
| 2/1 | 2026/11/02 10:48 | agent | patch-evaluator |
3mModel:core Args: null Results: {
"EnableConfigs": [
"INFINIBAND_SRP",
"INFINIBAND",
"INFINIBAND_ADDR_TRANS",
"SCSI"
],
"FocusSymbols": [
"srp_recv_done",
"srp_cm_rep_handler",
"srp_ib_cm_handler",
"srp_rdma_cm_handler"
],
"Reasoning": "The patch modifies the SCSI RDMA Protocol (SRP) initiator driver (drivers/infiniband/ulp/srp/ib_srp.c). Specifically, it updates DMA buffer sync sizes in srp_recv_done() and adds validation logic in srp_cm_rep_handler() to check that target-reported max_ti_iu_len is large enough for a struct srp_rsp. SRP is reachable in virtualized environments via software RDMA transports (e.g. rdma_rxe, siw) over standard network devices and sysfs configuration. Therefore, this represents reachable protocol handling and validation logic that warrants fuzzing.",
"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 32ec8b0a0d47355606a8a93ea4e70d6e6a526de9
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Nov 2 10:47:59 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 5811f02df98053..159d6b6aa93e3a 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -2111,7 +2111,7 @@ static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
return;
}
- ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
+ ib_dma_sync_single_for_cpu(dev, iu->dma, iu->size,
DMA_FROM_DEVICE);
opcode = *(u8 *) iu->buf;
@@ -2148,7 +2148,7 @@ static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
break;
}
- ib_dma_sync_single_for_device(dev, iu->dma, ch->max_ti_iu_len,
+ ib_dma_sync_single_for_device(dev, iu->dma, iu->size,
DMA_FROM_DEVICE);
res = srp_post_recv(ch, iu);
@@ -2379,6 +2379,13 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
if (lrsp->opcode == SRP_LOGIN_RSP) {
ch->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
+ if (ch->max_ti_iu_len < sizeof(struct srp_rsp)) {
+ shost_printk(KERN_ERR, target->scsi_host, PFX
+ "Target reported max_ti_iu_len %u, too small for a %zu byte SRP_RSP\n",
+ ch->max_ti_iu_len, sizeof(struct srp_rsp));
+ ret = -ECONNRESET;
+ goto error;
+ }
ch->req_lim = be32_to_cpu(lrsp->req_lim_delta);
ch->use_imm_data = srp_use_imm_data &&
(lrsp->rsp_flags & SRP_LOGIN_RSP_IMMED_SUPP);
|
| 3/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 3483 output: 33 thoughts: 186 Thoughts: Here's my analysis of the situation: **Initial Assessment of the Code Patch** Okay, let's break this down. First, the task focuses on this patch, and I see it modifies `drivers/infiniband/ulp/srp/ib_srp.c`. That's the SCSI RDMA Protocol initiator driver, `ib_srp`. My immediate instinct is to figure out if this is even relevant in the environments we're testing. Is `ib_srp` something we'd encounter in a standard virtualized setup like QEMU or Google Compute Engine? Could it be using software RDMA solutions like `rdma_rxe` or `siw`, or even just a loopback configuration? Hold on a second, let's not jump to conclusions. I need a refresher on SRP itself. Does SRP work with software RDMA implementations like `rxe` and `siw`, or does it inherently depend on specific hardware RDMA adapters? I need to clarify that before I get too deep. Alright, back to the source. The best approach is to use my tools. I'll fire up `grepper` and a `read-file` operation on the modified file, `drivers/infiniband/ulp/srp/ib_srp.c`. I need to understand its core functionality: How does it connect, what's its sysfs interface look like, how does it initialize through module loading, and what configuration options are available via Kconfig. That will give me a solid foundation for understanding the patch's impact. |
| 4/2 | 2026/11/02 10:48 | tool | grepper |
0mArgs:{
"Expression": "config INFINIBAND_SRP",
"PathPrefixes": [
"drivers/infiniband"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/infiniband/ulp/srp/Kconfig:2:config INFINIBAND_SRP\ndrivers/infiniband/ulp/srp/Kconfig-3-\ttristate \"InfiniBand SCSI RDMA Protocol\"\n--\ndrivers/infiniband/ulp/srpt/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/infiniband/ulp/srpt/Kconfig:2:config INFINIBAND_SRPT\ndrivers/infiniband/ulp/srpt/Kconfig-3-\ttristate \"InfiniBand SCSI RDMA Protocol target support\"\n"
} |
| 5/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4225 output: 40 thoughts: 41 Thoughts: Okay, let's dive into this. Here's my thought process on the matter: **Examining SRP Driver Configuration and Implementation** Right, so I need to get a handle on the SRP driver. My initial thought is to zero in on `drivers/infiniband/ulp/srp/Kconfig` and `drivers/infiniband/ulp/srp/ib_srp.c`. The Kconfig will outline the configuration options, dependencies, and ultimately, whether the driver is even *built* into the kernel image or available as a module. I need to understand how it's controlled and what features are exposed to the user, this is where I would look at the relevant `#define` macros and any help text. Then, `drivers/infiniband/ulp/srp/ib_srp.c` is going to be the heart of the driver's implementation. It should contain the core functionality, the registration of the SRP protocol with the InfiniBand stack, device probe/remove routines, and probably the meat of the data transfer handling. I'll need to scrutinize the data structures, the event handling, and the interaction with the IB verbs. I also need to see how the connection is set up and teared down, error handling, and resource management. I'll want to quickly see how it's architected: where are the major functions, how's it integrated with the larger InfiniBand stack, and I will be looking for any potential performance bottlenecks or memory leaks. This pair of files is the obvious starting point. Time to get to work. |
| 6/2 | 2026/11/02 10:48 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/Kconfig",
"FirstLine": 1,
"LineCount": 30
}Results: {
"Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tconfig INFINIBAND_SRP\n 3:\t\ttristate \"InfiniBand SCSI RDMA Protocol\"\n 4:\t\tdepends on SCSI \u0026\u0026 INFINIBAND_ADDR_TRANS\n 5:\t\tselect SCSI_SRP_ATTRS\n 6:\t\thelp\n 7:\t\t Support for the SCSI RDMA Protocol over InfiniBand. This\n 8:\t\t allows you to access storage devices that speak SRP over\n 9:\t\t InfiniBand.\n 10:\t\n 11:\t\t The SRP protocol is defined by the INCITS T10 technical\n 12:\t\t committee. See \u003chttp://www.t10.org/\u003e.\n 13:\t\n"
} |
| 7/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4840 output: 36 thoughts: 45 Thoughts: Okay, let's dive into this SRP initiator configuration and how it's activated from userspace. My first thought is to see if this process interacts with sysfs. Specifically, I need to know if it's responsible for creating attributes like `add_target`, which is a common way to manage such things. My next step is clear – I'm going to jump into `ib_srp.c` directly. That's the core of the SRP implementation, so it's the most logical place to dissect the initiation process and track down the userspace interface. This should give me the details I need to understand the control flow. |
| 8/2 | 2026/11/02 10:48 | tool | grepper |
0mArgs:{
"Expression": "add_target",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=3138=static int srp_sdev_count(struct Scsi_Host *host)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3155- */\ndrivers/infiniband/ulp/srp/ib_srp.c:3156:static int srp_add_target(struct srp_host *host, struct srp_target_port *target)\ndrivers/infiniband/ulp/srp/ib_srp.c-3157-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=3245=static bool srp_conn_unique(struct srp_host *host,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3280- *\ndrivers/infiniband/ulp/srp/ib_srp.c:3281: * to the add_target sysfs attribute.\ndrivers/infiniband/ulp/srp/ib_srp.c-3282- */\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=3383=static int srp_parse_options(struct net *net, const char *buf,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3742-\ndrivers/infiniband/ulp/srp/ib_srp.c:3743:static ssize_t add_target_store(struct device *dev,\ndrivers/infiniband/ulp/srp/ib_srp.c-3744-\t\t\t\tstruct device_attribute *attr, const char *buf,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3794-\ndrivers/infiniband/ulp/srp/ib_srp.c:3795:\tret = mutex_lock_interruptible(\u0026host-\u003eadd_target_mutex);\ndrivers/infiniband/ulp/srp/ib_srp.c-3796-\tif (ret \u003c 0)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3931-\ndrivers/infiniband/ulp/srp/ib_srp.c:3932:\tret = srp_add_target(host, target);\ndrivers/infiniband/ulp/srp/ib_srp.c-3933-\tif (ret)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3957-out:\ndrivers/infiniband/ulp/srp/ib_srp.c:3958:\tmutex_unlock(\u0026host-\u003eadd_target_mutex);\ndrivers/infiniband/ulp/srp/ib_srp.c-3959-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-3987-\ndrivers/infiniband/ulp/srp/ib_srp.c:3988:static DEVICE_ATTR_WO(add_target);\ndrivers/infiniband/ulp/srp/ib_srp.c-3989-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=4010=static struct attribute *srp_class_attrs[] = {\ndrivers/infiniband/ulp/srp/ib_srp.c:4011:\t\u0026dev_attr_add_target.attr,\ndrivers/infiniband/ulp/srp/ib_srp.c-4012-\t\u0026dev_attr_ibdev.attr,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=4017=static struct srp_host *srp_add_port(struct srp_device *device, u32 port)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-4026-\tspin_lock_init(\u0026host-\u003etarget_lock);\ndrivers/infiniband/ulp/srp/ib_srp.c:4027:\tmutex_init(\u0026host-\u003eadd_target_mutex);\ndrivers/infiniband/ulp/srp/ib_srp.c-4028-\thost-\u003esrp_dev = device;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=4140=static void srp_remove_one(struct ib_device *device, void *client_data)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-4149-\t\t/*\ndrivers/infiniband/ulp/srp/ib_srp.c:4150:\t\t * Remove the add_target sysfs entry so that no new target ports\ndrivers/infiniband/ulp/srp/ib_srp.c-4151-\t\t * can be created.\n--\ndrivers/infiniband/ulp/srp/ib_srp.h=123=struct srp_host {\n--\ndrivers/infiniband/ulp/srp/ib_srp.h-129-\tstruct list_head\tlist;\ndrivers/infiniband/ulp/srp/ib_srp.h:130:\tstruct mutex\t\tadd_target_mutex;\ndrivers/infiniband/ulp/srp/ib_srp.h-131-};\n"
} |
| 9/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6434 output: 38 thoughts: 99 Thoughts: **SRP Device Initialization: A Deep Dive** Okay, here's what's going through my mind as I dig into this. I see that `srp_class_attrs` function is responsible for creating the `add_target` sysfs attribute for SRP devices. That's straightforward enough. But immediately, a question pops into my head: can we actually *create* SRP devices on top of software RDMA transports like `rdma_rxe` or `siw`? This could open up some interesting possibilities if it's supported. To understand that better, I should look at how `srp_add_one` is actually getting called. Okay, it's registered as an `ib_client`. This gives me a direction for checking if the SRP driver can be integrated with software RDMA. I should see if the generic `ib_register_client` function has what it needs. |
| 10/2 | 2026/11/02 10:48 | tool | grepper |
0mArgs:{
"Expression": "ib_register_client",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=4190=static int __init srp_init_module(void)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-4249-\ndrivers/infiniband/ulp/srp/ib_srp.c:4250:\tret = ib_register_client(\u0026srp_client);\ndrivers/infiniband/ulp/srp/ib_srp.c-4251-\tif (ret) {\n"
} |
| 11/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6909 output: 47 thoughts: 233 Thoughts: **RDMA Device Creation and Syzkaller Exploration** Okay, so whenever an RDMA device pops into existence – and that includes these software RDMA devices like `rdma_rxe` or `siw`, created via netlink, which is interesting in itself – the `ib_register_client(&srp_client)` function gets a heads-up. That, in turn, triggers a call to `srp_add_one`. Got it. Now, wait a minute, doesn't syzkaller actually support RDMA? Specifically, I'm thinking about those `rdma_rxe` and `siw` setups, using the netlink rdma interface. This could be a good angle for fuzzing. Let me check if there are any syzkaller descriptions, or perhaps a way to reach those functionalities. I need to make sure I'm not duplicating effort, or missing a way in. Hold on, before I dive too deep, let's take a look for any syzkaller functions related to `rdma_*`, maybe something like `syz_rdma_*`, or even see if sysfs `/sys/class/infiniband_srp/...` might give me some clues. Actually, how does `srp_cm_rep_handler` even get invoked? I need to understand the connection between that and the initial device registration. Time to dig into the source code, specifically `srp_cm_rep_handler` and `srp_recv_done` in `drivers/infiniband/ulp/srp/ib_srp.c`. That should give me the crucial information I need. |
| 12/2 | 2026/11/02 10:48 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 2100,
"LineCount": 60
}Results: {
"Contents": "2100:\tstatic void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\n2101:\t{\n2102:\t\tstruct srp_iu *iu = container_of(wc-\u003ewr_cqe, struct srp_iu, cqe);\n2103:\t\tstruct srp_rdma_ch *ch = cq-\u003ecq_context;\n2104:\t\tstruct srp_target_port *target = ch-\u003etarget;\n2105:\t\tstruct ib_device *dev = target-\u003esrp_host-\u003esrp_dev-\u003edev;\n2106:\t\tint res;\n2107:\t\tu8 opcode;\n2108:\t\n2109:\t\tif (unlikely(wc-\u003estatus != IB_WC_SUCCESS)) {\n2110:\t\t\tsrp_handle_qp_err(cq, wc, \"RECV\");\n2111:\t\t\treturn;\n2112:\t\t}\n2113:\t\n2114:\t\tib_dma_sync_single_for_cpu(dev, iu-\u003edma, iu-\u003esize,\n2115:\t\t\t\t\t DMA_FROM_DEVICE);\n2116:\t\n2117:\t\topcode = *(u8 *) iu-\u003ebuf;\n2118:\t\n2119:\t\tif (0) {\n2120:\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n2121:\t\t\t\t PFX \"recv completion, opcode 0x%02x\\n\", opcode);\n2122:\t\t\tprint_hex_dump(KERN_ERR, \"\", DUMP_PREFIX_OFFSET, 8, 1,\n2123:\t\t\t\t iu-\u003ebuf, wc-\u003ebyte_len, true);\n2124:\t\t}\n2125:\t\n2126:\t\tswitch (opcode) {\n2127:\t\tcase SRP_RSP:\n2128:\t\t\tsrp_process_rsp(ch, iu-\u003ebuf, wc-\u003ebyte_len);\n2129:\t\t\tbreak;\n2130:\t\n2131:\t\tcase SRP_CRED_REQ:\n2132:\t\t\tsrp_process_cred_req(ch, iu-\u003ebuf, wc-\u003ebyte_len);\n2133:\t\t\tbreak;\n2134:\t\n2135:\t\tcase SRP_AER_REQ:\n2136:\t\t\tsrp_process_aer_req(ch, iu-\u003ebuf, wc-\u003ebyte_len);\n2137:\t\t\tbreak;\n2138:\t\n2139:\t\tcase SRP_T_LOGOUT:\n2140:\t\t\t/* XXX Handle target logout */\n2141:\t\t\tshost_printk(KERN_WARNING, target-\u003escsi_host,\n2142:\t\t\t\t PFX \"Got target logout request\\n\");\n2143:\t\t\tbreak;\n2144:\t\n2145:\t\tdefault:\n2146:\t\t\tshost_printk(KERN_WARNING, target-\u003escsi_host,\n2147:\t\t\t\t PFX \"Unhandled SRP opcode 0x%02x\\n\", opcode);\n2148:\t\t\tbreak;\n2149:\t\t}\n2150:\t\n2151:\t\tib_dma_sync_single_for_device(dev, iu-\u003edma, iu-\u003esize,\n2152:\t\t\t\t\t DMA_FROM_DEVICE);\n2153:\t\n2154:\t\tres = srp_post_recv(ch, iu);\n2155:\t\tif (res != 0)\n2156:\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n2157:\t\t\t\t PFX \"Recv failed with error code %d\\n\", res);\n2158:\t}\n2159:\t\n"
} |
| 13/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8502 output: 47 thoughts: 14 Thoughts: Okay, let's dive into this. Here's how I'd approach summarizing the prompt, keeping in mind my own expert understanding: **Analyzing the Call for Summary: SRP_CM_REP_HANDLER** Alright, the request is straightforward. I'm being prompted to examine something related to `srp_cm_rep_handler` and provide a summary of the situation. This tells me that the focus is likely on an aspect of code, a system component, or possibly a data structure with that name. Given the naming conventions used, I'd immediately jump to the assumptions: `srp` suggests a secure remote password or similar authentication protocol, `cm` could stand for something like connection management, configuration management, or component manager and `rep` might imply something like a request/response or representation handler. The term *handler* strongly suggests that we are talking about a function, module or even a class within a piece of software. In my expertise, I'm going to look at the context of what needs to be summarized, and infer from that what the handler does within its environment. Now I'm ready for the input to clarify the specifics. |
| 14/2 | 2026/11/02 10:48 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 2370,
"LineCount": 40
}Results: {
"Contents": "2370:\tstatic void srp_cm_rep_handler(struct ib_cm_id *cm_id,\n2371:\t\t\t\t const struct srp_login_rsp *lrsp,\n2372:\t\t\t\t struct srp_rdma_ch *ch)\n2373:\t{\n2374:\t\tstruct srp_target_port *target = ch-\u003etarget;\n2375:\t\tstruct ib_qp_attr *qp_attr = NULL;\n2376:\t\tint attr_mask = 0;\n2377:\t\tint ret = 0;\n2378:\t\tint i;\n2379:\t\n2380:\t\tif (lrsp-\u003eopcode == SRP_LOGIN_RSP) {\n2381:\t\t\tch-\u003emax_ti_iu_len = be32_to_cpu(lrsp-\u003emax_ti_iu_len);\n2382:\t\t\tif (ch-\u003emax_ti_iu_len \u003c sizeof(struct srp_rsp)) {\n2383:\t\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host, PFX\n2384:\t\t\t\t\t \"Target reported max_ti_iu_len %u, too small for a %zu byte SRP_RSP\\n\",\n2385:\t\t\t\t\t ch-\u003emax_ti_iu_len, sizeof(struct srp_rsp));\n2386:\t\t\t\tret = -ECONNRESET;\n2387:\t\t\t\tgoto error;\n2388:\t\t\t}\n2389:\t\t\tch-\u003ereq_lim = be32_to_cpu(lrsp-\u003ereq_lim_delta);\n2390:\t\t\tch-\u003euse_imm_data = srp_use_imm_data \u0026\u0026\n2391:\t\t\t\t(lrsp-\u003ersp_flags \u0026 SRP_LOGIN_RSP_IMMED_SUPP);\n2392:\t\t\tch-\u003emax_it_iu_len = srp_max_it_iu_len(target-\u003ecmd_sg_cnt,\n2393:\t\t\t\t\t\t\t ch-\u003euse_imm_data,\n2394:\t\t\t\t\t\t\t target-\u003emax_it_iu_size);\n2395:\t\t\tWARN_ON_ONCE(ch-\u003emax_it_iu_len \u003e\n2396:\t\t\t\t be32_to_cpu(lrsp-\u003emax_it_iu_len));\n2397:\t\n2398:\t\t\tif (ch-\u003euse_imm_data)\n2399:\t\t\t\tshost_printk(KERN_DEBUG, target-\u003escsi_host,\n2400:\t\t\t\t\t PFX \"using immediate data\\n\");\n2401:\t\n2402:\t\t\t/*\n2403:\t\t\t * Reserve credits for task management so we don't\n2404:\t\t\t * bounce requests back to the SCSI mid-layer.\n2405:\t\t\t */\n2406:\t\t\ttarget-\u003escsi_host-\u003ecan_queue\n2407:\t\t\t\t= min(ch-\u003ereq_lim - SRP_TSK_MGMT_SQ_SIZE,\n2408:\t\t\t\t target-\u003escsi_host-\u003ecan_queue);\n2409:\t\t\ttarget-\u003escsi_host-\u003ecmd_per_lun\n"
} |
| 15/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9594 output: 36 thoughts: 240 Thoughts: **Analyzing a Recent Commit** Okay, let's dive into this commit and figure out its purpose. I need to understand what problem this change was addressing, or what new functionality it's introducing. The first thing to do is inspect the git commit message and diff – that's where the real story lives. Alright, here's what jumps out: in the `srp_recv_done` function, I see a change to the `ib_dma_sync_single_for_cpu` call. Previously, it used `ch->max_ti_iu_len` as the size argument, but now it's using `iu->size`. Hmm, interesting. And now, I see that the code in the `srp_cm_rep_handler` has an `if` statement related to `ch->max_ti_iu_len`. Wait a second. What's the *reasoning* behind this change? Before this patch, `srp_recv_done()` was *explicitly* using `ch->max_ti_iu_len` for the size when syncing the DMA buffer for the CPU and device. Something is wrong, and I need to figure out why they were different. Now, how is the `iu` structure allocated? I need to track down the allocation and initialization of `iu` to grasp the intent here. I'll check `srp_alloc_iu_bufs` or wherever this is done. That’s the key to understanding the context of the change and determining if it makes sense. |
| 16/2 | 2026/11/02 10:48 | tool | grepper |
0mArgs:{
"Expression": "iu-\u003esize",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=223=static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-241-\ndrivers/infiniband/ulp/srp/ib_srp.c:242:\tiu-\u003esize = size;\ndrivers/infiniband/ulp/srp/ib_srp.c-243-\tiu-\u003edirection = direction;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=255=static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-259-\ndrivers/infiniband/ulp/srp/ib_srp.c:260:\tib_dma_unmap_single(host-\u003esrp_dev-\u003edev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-261-\t\t\t iu-\u003edirection);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=1921=static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-1927-\tlist.addr = iu-\u003edma;\ndrivers/infiniband/ulp/srp/ib_srp.c:1928:\tlist.length = iu-\u003esize;\ndrivers/infiniband/ulp/srp/ib_srp.c-1929-\tlist.lkey = target-\u003elkey;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2100=static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2113-\ndrivers/infiniband/ulp/srp/ib_srp.c:2114:\tib_dma_sync_single_for_cpu(dev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-2115-\t\t\t\t DMA_FROM_DEVICE);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2150-\ndrivers/infiniband/ulp/srp/ib_srp.c:2151:\tib_dma_sync_single_for_device(dev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-2152-\t\t\t\t DMA_FROM_DEVICE);\n"
} |
| 17/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10945 output: 41 thoughts: 499 Thoughts: **Analyzing the Reachability of `ib_srp` for Fuzzing** Okay, let's break this down. First, I need to understand the potential for issues with buffer sizes and DMA mapping related to `iu->size` and `ch->max_ti_iu_len`. I get that syncing these values, especially if there's a mismatch or the target reports a too-small `max_ti_iu_len`, could lead to DMA errors or partial data transfer. Now, the big question is whether `drivers/infiniband/ulp/srp/ib_srp.c` is actually reachable and worth dedicating fuzzing resources to. The key is reachability: can this code *actually* run in a typical virtualized environment? The documentation I'm reading stresses that unreachable code shouldn't be fuzzed, no matter how complex it looks. So, how does `ib_srp` fit into the picture? What's its execution path? Let's see… it's the initiator driver for SRP over InfiniBand/RDMA. Okay, can SRP connect over RDMA to SRPT (the target)? Wait, both the initiator *and* the target driver, `ib_srpt`, are in the kernel! Can `rdma_rxe` (software RoCE) or `siw` (software iWARP) be run in QEMU? Yes! I know that `rdma_rxe` can work on an Ethernet device like loopback, veth, or virtio-net, no physical hardware needed! But wait, does SRP support RoCE or iWARP? Or just InfiniBand? Time to check `srp_parse_options` and `srp_create_ch_ib` / `srp_connect_ch`! Need to dive into `ib_srp.c` itself. I need to look at what transport options SRP offers and the specific code that handles those connections. That should give me the final answer. |
| 18/2 | 2026/11/02 10:48 | tool | grepper |
0mArgs:{
"Expression": "rdma_cm|ib_cm",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "\nFull output is too long, showing 200 out of 375 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (2 files in total):\ndrivers/infiniband/ulp/srp/ib_srp.c:109\ndrivers/infiniband/ulp/srp/ib_srp.h:11\n\ndrivers/infiniband/ulp/srp/ib_srp.c=145=static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,\ndrivers/infiniband/ulp/srp/ib_srp.c-146-\t\tconst char *opname);\ndrivers/infiniband/ulp/srp/ib_srp.c:147:static int srp_ib_cm_handler(struct ib_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c:148:\t\t\t const struct ib_cm_event *event);\ndrivers/infiniband/ulp/srp/ib_srp.c:149:static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c:150:\t\t\t struct rdma_cm_event *event);\ndrivers/infiniband/ulp/srp/ib_srp.c-151-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=272=static int srp_init_ib_qp(struct srp_target_port *target,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-283-\t\t\t\t target-\u003esrp_host-\u003eport,\ndrivers/infiniband/ulp/srp/ib_srp.c:284:\t\t\t\t be16_to_cpu(target-\u003eib_cm.pkey),\ndrivers/infiniband/ulp/srp/ib_srp.c-285-\t\t\t\t \u0026attr-\u003epkey_index);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-304-\ndrivers/infiniband/ulp/srp/ib_srp.c:305:static int srp_new_ib_cm_id(struct srp_rdma_ch *ch)\ndrivers/infiniband/ulp/srp/ib_srp.c-306-{\ndrivers/infiniband/ulp/srp/ib_srp.c-307-\tstruct srp_target_port *target = ch-\u003etarget;\ndrivers/infiniband/ulp/srp/ib_srp.c:308:\tstruct ib_cm_id *new_cm_id;\ndrivers/infiniband/ulp/srp/ib_srp.c-309-\ndrivers/infiniband/ulp/srp/ib_srp.c-310-\tnew_cm_id = ib_create_cm_id(target-\u003esrp_host-\u003esrp_dev-\u003edev,\ndrivers/infiniband/ulp/srp/ib_srp.c:311:\t\t\t\t srp_ib_cm_handler, ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-312-\tif (IS_ERR(new_cm_id))\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-314-\ndrivers/infiniband/ulp/srp/ib_srp.c:315:\tif (ch-\u003eib_cm.cm_id)\ndrivers/infiniband/ulp/srp/ib_srp.c:316:\t\tib_destroy_cm_id(ch-\u003eib_cm.cm_id);\ndrivers/infiniband/ulp/srp/ib_srp.c:317:\tch-\u003eib_cm.cm_id = new_cm_id;\ndrivers/infiniband/ulp/srp/ib_srp.c-318-\tif (rdma_cap_opa_ah(target-\u003esrp_host-\u003esrp_dev-\u003edev,\ndrivers/infiniband/ulp/srp/ib_srp.c-319-\t\t\t target-\u003esrp_host-\u003eport))\ndrivers/infiniband/ulp/srp/ib_srp.c:320:\t\tch-\u003eib_cm.path.rec_type = SA_PATH_REC_TYPE_OPA;\ndrivers/infiniband/ulp/srp/ib_srp.c-321-\telse\ndrivers/infiniband/ulp/srp/ib_srp.c:322:\t\tch-\u003eib_cm.path.rec_type = SA_PATH_REC_TYPE_IB;\ndrivers/infiniband/ulp/srp/ib_srp.c:323:\tch-\u003eib_cm.path.sgid = target-\u003esgid;\ndrivers/infiniband/ulp/srp/ib_srp.c:324:\tch-\u003eib_cm.path.dgid = target-\u003eib_cm.orig_dgid;\ndrivers/infiniband/ulp/srp/ib_srp.c:325:\tch-\u003eib_cm.path.pkey = target-\u003eib_cm.pkey;\ndrivers/infiniband/ulp/srp/ib_srp.c:326:\tch-\u003eib_cm.path.service_id = target-\u003eib_cm.service_id;\ndrivers/infiniband/ulp/srp/ib_srp.c-327-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-330-\ndrivers/infiniband/ulp/srp/ib_srp.c:331:static int srp_new_rdma_cm_id(struct srp_rdma_ch *ch)\ndrivers/infiniband/ulp/srp/ib_srp.c-332-{\ndrivers/infiniband/ulp/srp/ib_srp.c-333-\tstruct srp_target_port *target = ch-\u003etarget;\ndrivers/infiniband/ulp/srp/ib_srp.c:334:\tstruct rdma_cm_id *new_cm_id;\ndrivers/infiniband/ulp/srp/ib_srp.c-335-\tint ret;\ndrivers/infiniband/ulp/srp/ib_srp.c-336-\ndrivers/infiniband/ulp/srp/ib_srp.c:337:\tnew_cm_id = rdma_create_id(target-\u003enet, srp_rdma_cm_handler, ch,\ndrivers/infiniband/ulp/srp/ib_srp.c-338-\t\t\t\t RDMA_PS_TCP, IB_QPT_RC);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-345-\tinit_completion(\u0026ch-\u003edone);\ndrivers/infiniband/ulp/srp/ib_srp.c:346:\tret = rdma_resolve_addr(new_cm_id, target-\u003erdma_cm.src_specified ?\ndrivers/infiniband/ulp/srp/ib_srp.c:347:\t\t\t\t\u0026target-\u003erdma_cm.src.sa : NULL,\ndrivers/infiniband/ulp/srp/ib_srp.c:348:\t\t\t\t\u0026target-\u003erdma_cm.dst.sa,\ndrivers/infiniband/ulp/srp/ib_srp.c-349-\t\t\t\tSRP_PATH_REC_TIMEOUT_MS);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-351-\t\tpr_err(\"No route available from %pISpsc to %pISpsc (%d)\\n\",\ndrivers/infiniband/ulp/srp/ib_srp.c:352:\t\t \u0026target-\u003erdma_cm.src, \u0026target-\u003erdma_cm.dst, ret);\ndrivers/infiniband/ulp/srp/ib_srp.c-353-\t\tgoto out;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-361-\t\tpr_err(\"Resolving address %pISpsc failed (%d)\\n\",\ndrivers/infiniband/ulp/srp/ib_srp.c:362:\t\t \u0026target-\u003erdma_cm.dst, ret);\ndrivers/infiniband/ulp/srp/ib_srp.c-363-\t\tgoto out;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-365-\ndrivers/infiniband/ulp/srp/ib_srp.c:366:\tswap(ch-\u003erdma_cm.cm_id, new_cm_id);\ndrivers/infiniband/ulp/srp/ib_srp.c-367-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=375=static int srp_new_cm_id(struct srp_rdma_ch *ch)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-378-\ndrivers/infiniband/ulp/srp/ib_srp.c:379:\treturn target-\u003eusing_rdma_cm ? srp_new_rdma_cm_id(ch) :\ndrivers/infiniband/ulp/srp/ib_srp.c:380:\t\tsrp_new_ib_cm_id(ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-381-}\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=525=static int srp_create_ch_ib(struct srp_rdma_ch *ch)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-567-\ndrivers/infiniband/ulp/srp/ib_srp.c:568:\tif (target-\u003eusing_rdma_cm) {\ndrivers/infiniband/ulp/srp/ib_srp.c:569:\t\tret = rdma_create_qp(ch-\u003erdma_cm.cm_id, dev-\u003epd, init_attr);\ndrivers/infiniband/ulp/srp/ib_srp.c:570:\t\tqp = ch-\u003erdma_cm.cm_id-\u003eqp;\ndrivers/infiniband/ulp/srp/ib_srp.c-571-\t} else {\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-617-err_qp:\ndrivers/infiniband/ulp/srp/ib_srp.c:618:\tif (target-\u003eusing_rdma_cm)\ndrivers/infiniband/ulp/srp/ib_srp.c:619:\t\trdma_destroy_qp(ch-\u003erdma_cm.cm_id);\ndrivers/infiniband/ulp/srp/ib_srp.c-620-\telse\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=638=static void srp_free_ch_ib(struct srp_target_port *target,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-646-\ndrivers/infiniband/ulp/srp/ib_srp.c:647:\tif (target-\u003eusing_rdma_cm) {\ndrivers/infiniband/ulp/srp/ib_srp.c:648:\t\tif (ch-\u003erdma_cm.cm_id) {\ndrivers/infiniband/ulp/srp/ib_srp.c:649:\t\t\trdma_destroy_id(ch-\u003erdma_cm.cm_id);\ndrivers/infiniband/ulp/srp/ib_srp.c:650:\t\t\tch-\u003erdma_cm.cm_id = NULL;\ndrivers/infiniband/ulp/srp/ib_srp.c-651-\t\t}\ndrivers/infiniband/ulp/srp/ib_srp.c-652-\t} else {\ndrivers/infiniband/ulp/srp/ib_srp.c:653:\t\tif (ch-\u003eib_cm.cm_id) {\ndrivers/infiniband/ulp/srp/ib_srp.c:654:\t\t\tib_destroy_cm_id(ch-\u003eib_cm.cm_id);\ndrivers/infiniband/ulp/srp/ib_srp.c:655:\t\t\tch-\u003eib_cm.cm_id = NULL;\ndrivers/infiniband/ulp/srp/ib_srp.c-656-\t\t}\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=697=static void srp_path_rec_completion(int status,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-708-\telse\ndrivers/infiniband/ulp/srp/ib_srp.c:709:\t\tch-\u003eib_cm.path = *pathrec;\ndrivers/infiniband/ulp/srp/ib_srp.c-710-\tcomplete(\u0026ch-\u003edone);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=713=static int srp_ib_lookup_path(struct srp_rdma_ch *ch)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-717-\ndrivers/infiniband/ulp/srp/ib_srp.c:718:\tch-\u003eib_cm.path.numb_path = 1;\ndrivers/infiniband/ulp/srp/ib_srp.c-719-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-721-\ndrivers/infiniband/ulp/srp/ib_srp.c:722:\tch-\u003eib_cm.path_query_id = ib_sa_path_rec_get(\u0026srp_sa_client,\ndrivers/infiniband/ulp/srp/ib_srp.c-723-\t\t\t\t\t target-\u003esrp_host-\u003esrp_dev-\u003edev,\ndrivers/infiniband/ulp/srp/ib_srp.c-724-\t\t\t\t\t target-\u003esrp_host-\u003eport,\ndrivers/infiniband/ulp/srp/ib_srp.c:725:\t\t\t\t\t \u0026ch-\u003eib_cm.path,\ndrivers/infiniband/ulp/srp/ib_srp.c-726-\t\t\t\t\t IB_SA_PATH_REC_SERVICE_ID |\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-733-\t\t\t\t\t srp_path_rec_completion,\ndrivers/infiniband/ulp/srp/ib_srp.c:734:\t\t\t\t\t ch, \u0026ch-\u003eib_cm.path_query);\ndrivers/infiniband/ulp/srp/ib_srp.c:735:\tif (ch-\u003eib_cm.path_query_id \u003c 0)\ndrivers/infiniband/ulp/srp/ib_srp.c:736:\t\treturn ch-\u003eib_cm.path_query_id;\ndrivers/infiniband/ulp/srp/ib_srp.c-737-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-744-\t\t\t PFX \"Path record query failed: sgid %pI6, dgid %pI6, pkey %#04x, service_id %#16llx\\n\",\ndrivers/infiniband/ulp/srp/ib_srp.c:745:\t\t\t ch-\u003eib_cm.path.sgid.raw, ch-\u003eib_cm.path.dgid.raw,\ndrivers/infiniband/ulp/srp/ib_srp.c:746:\t\t\t be16_to_cpu(target-\u003eib_cm.pkey),\ndrivers/infiniband/ulp/srp/ib_srp.c:747:\t\t\t be64_to_cpu(target-\u003eib_cm.service_id));\ndrivers/infiniband/ulp/srp/ib_srp.c-748-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=752=static int srp_rdma_lookup_path(struct srp_rdma_ch *ch)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-758-\ndrivers/infiniband/ulp/srp/ib_srp.c:759:\tret = rdma_resolve_route(ch-\u003erdma_cm.cm_id, SRP_PATH_REC_TIMEOUT_MS);\ndrivers/infiniband/ulp/srp/ib_srp.c-760-\tif (ret)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=772=static int srp_lookup_path(struct srp_rdma_ch *ch)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-775-\ndrivers/infiniband/ulp/srp/ib_srp.c:776:\treturn target-\u003eusing_rdma_cm ? srp_rdma_lookup_path(ch) :\ndrivers/infiniband/ulp/srp/ib_srp.c-777-\t\tsrp_ib_lookup_path(ch);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=797=static int srp_send_req(struct srp_rdma_ch *ch, uint32_t max_iu_len,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-803-\t\tstruct srp_login_req_rdma rdma_req;\ndrivers/infiniband/ulp/srp/ib_srp.c:804:\t\tstruct ib_cm_req_param\t ib_param;\ndrivers/infiniband/ulp/srp/ib_srp.c-805-\t\tstruct srp_login_req\t ib_req;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-836-\ndrivers/infiniband/ulp/srp/ib_srp.c:837:\tif (target-\u003eusing_rdma_cm) {\ndrivers/infiniband/ulp/srp/ib_srp.c-838-\t\treq-\u003erdma_param.flow_control = req-\u003eib_param.flow_control;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-860-\ndrivers/infiniband/ulp/srp/ib_srp.c:861:\t\treq-\u003eib_param.primary_path = \u0026ch-\u003eib_cm.path;\ndrivers/infiniband/ulp/srp/ib_srp.c-862-\t\treq-\u003eib_param.alternate_path = NULL;\ndrivers/infiniband/ulp/srp/ib_srp.c:863:\t\treq-\u003eib_param.service_id = target-\u003eib_cm.service_id;\ndrivers/infiniband/ulp/srp/ib_srp.c-864-\t\tget_random_bytes(\u0026req-\u003eib_param.starting_psn, 4);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-911-\ndrivers/infiniband/ulp/srp/ib_srp.c:912:\tif (target-\u003eusing_rdma_cm)\ndrivers/infiniband/ulp/srp/ib_srp.c:913:\t\tstatus = rdma_connect(ch-\u003erdma_cm.cm_id, \u0026req-\u003erdma_param);\ndrivers/infiniband/ulp/srp/ib_srp.c-914-\telse\ndrivers/infiniband/ulp/srp/ib_srp.c:915:\t\tstatus = ib_send_cm_req(ch-\u003eib_cm.cm_id, \u0026req-\u003eib_param);\ndrivers/infiniband/ulp/srp/ib_srp.c-916-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=939=static void srp_disconnect_target(struct srp_target_port *target)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-949-\t\tret = 0;\ndrivers/infiniband/ulp/srp/ib_srp.c:950:\t\tif (target-\u003eusing_rdma_cm) {\ndrivers/infiniband/ulp/srp/ib_srp.c:951:\t\t\tif (ch-\u003erdma_cm.cm_id)\ndrivers/infiniband/ulp/srp/ib_srp.c:952:\t\t\t\trdma_disconnect(ch-\u003erdma_cm.cm_id);\ndrivers/infiniband/ulp/srp/ib_srp.c-953-\t\t} else {\ndrivers/infiniband/ulp/srp/ib_srp.c:954:\t\t\tif (ch-\u003eib_cm.cm_id)\ndrivers/infiniband/ulp/srp/ib_srp.c:955:\t\t\t\tret = ib_send_cm_dreq(ch-\u003eib_cm.cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c-956-\t\t\t\t\t\t NULL, 0);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2343=static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2369-\ndrivers/infiniband/ulp/srp/ib_srp.c:2370:static void srp_cm_rep_handler(struct ib_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c-2371-\t\t\t const struct srp_login_rsp *lrsp,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2432-\ndrivers/infiniband/ulp/srp/ib_srp.c:2433:\tif (!target-\u003eusing_rdma_cm) {\ndrivers/infiniband/ulp/srp/ib_srp.c-2434-\t\tret = -ENOMEM;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2439-\t\tqp_attr-\u003eqp_state = IB_QPS_RTR;\ndrivers/infiniband/ulp/srp/ib_srp.c:2440:\t\tret = ib_cm_init_qp_attr(cm_id, qp_attr, \u0026attr_mask);\ndrivers/infiniband/ulp/srp/ib_srp.c-2441-\t\tif (ret)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2448-\t\tqp_attr-\u003eqp_state = IB_QPS_RTS;\ndrivers/infiniband/ulp/srp/ib_srp.c:2449:\t\tret = ib_cm_init_qp_attr(cm_id, qp_attr, \u0026attr_mask);\ndrivers/infiniband/ulp/srp/ib_srp.c-2450-\t\tif (ret)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2468-\ndrivers/infiniband/ulp/srp/ib_srp.c:2469:static void srp_ib_cm_rej_handler(struct ib_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c:2470:\t\t\t\t const struct ib_cm_event *event,\ndrivers/infiniband/ulp/srp/ib_srp.c-2471-\t\t\t\t struct srp_rdma_ch *ch)\n\n"
} |
| 19/2 | 2026/11/02 10:48 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18090 output: 41 thoughts: 57 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: **Investigating the `srp_cm_rep_handler` Callers** Alright, so `srp_cm_rep_handler`… that's an interesting one. I know it's a critical piece of the SRP connection management puzzle. But I've just realized that both `srp_ib_cm_handler` and `srp_rdma_cm_handler` are calling into it. That's a potential area for either refactoring or at least really careful analysis. I need to understand the relationship and if there's any duplication of effort. I should immediately examine the call sites. Specifically, I'll need to figure out the context of each call to `srp_cm_rep_handler` to identify any shared states, assumptions, or any possibilities for race conditions. Any shared context or data structures involved? Is the control flow identical, or are there subtle differences in how the connection response is handled? I need to build a comprehensive picture of how this function is used and any dependencies it introduces. |
| 20/2 | 2026/11/02 10:49 | tool | grepper |
0mArgs:{
"Expression": "srp_cm_rep_handler",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=2343=static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2369-\ndrivers/infiniband/ulp/srp/ib_srp.c:2370:static void srp_cm_rep_handler(struct ib_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c-2371-\t\t\t const struct srp_login_rsp *lrsp,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2555=static int srp_ib_cm_handler(struct ib_cm_id *cm_id,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2571-\t\tcomp = 1;\ndrivers/infiniband/ulp/srp/ib_srp.c:2572:\t\tsrp_cm_rep_handler(cm_id, event-\u003eprivate_data, ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-2573-\t\tbreak;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2667=static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2704-\t\tcomp = 1;\ndrivers/infiniband/ulp/srp/ib_srp.c:2705:\t\tsrp_cm_rep_handler(NULL, event-\u003eparam.conn.private_data, ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-2706-\t\tbreak;\n"
} |
| 21/2 | 2026/11/02 10:49 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18929 output: 47 thoughts: 152 Thoughts: **My Current Line of Reasoning** Okay, so I'm seeing that `srp_cm_rep_handler` gets called by both `srp_ib_cm_handler` (for the InfiniBand Connection Manager) and `srp_rdma_cm_handler`. Now, the fact that `srp_rdma_cm_handler` is involved is significant because that means it handles the RDMA Connection Manager, which, of course, covers RoCE and iWARP, even software RDMA implementations like `rdma_rxe` and `siw`! This is starting to make sense... But, hold on a second... how does someone actually *use* `ib_srp`? I need to refresh my memory on that. Let's see... Ah, yes, the `add_target` sysfs entry. That's the key. Let's dig into the code. I need to check how `add_target_store` in `ib_srp.c` works. I want to see the exact mechanism it uses and, critically, what parameters it actually takes. I need to understand this better. |
| 22/2 | 2026/11/02 10:49 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 3740,
"LineCount": 60
}Results: {
"Contents": "3740:\t\treturn ret;\n3741:\t}\n3742:\t\n3743:\tstatic ssize_t add_target_store(struct device *dev,\n3744:\t\t\t\t\tstruct device_attribute *attr, const char *buf,\n3745:\t\t\t\t\tsize_t count)\n3746:\t{\n3747:\t\tstruct srp_host *host =\n3748:\t\t\tcontainer_of(dev, struct srp_host, dev);\n3749:\t\tstruct Scsi_Host *target_host;\n3750:\t\tstruct srp_target_port *target;\n3751:\t\tstruct srp_rdma_ch *ch;\n3752:\t\tstruct srp_device *srp_dev = host-\u003esrp_dev;\n3753:\t\tstruct ib_device *ibdev = srp_dev-\u003edev;\n3754:\t\tint ret, i, ch_idx;\n3755:\t\tunsigned int max_sectors_per_mr, mr_per_cmd = 0;\n3756:\t\tbool multich = false;\n3757:\t\tuint32_t max_iu_len;\n3758:\t\n3759:\t\ttarget_host = scsi_host_alloc(\u0026srp_template,\n3760:\t\t\t\t\t sizeof (struct srp_target_port));\n3761:\t\tif (!target_host)\n3762:\t\t\treturn -ENOMEM;\n3763:\t\n3764:\t\ttarget_host-\u003etransportt = ib_srp_transport_template;\n3765:\t\ttarget_host-\u003emax_channel = 0;\n3766:\t\ttarget_host-\u003emax_id = 1;\n3767:\t\ttarget_host-\u003emax_lun = -1LL;\n3768:\t\ttarget_host-\u003emax_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)-\u003ecdb;\n3769:\t\n3770:\t\tif (ibdev-\u003eattrs.kernel_cap_flags \u0026 IBK_SG_GAPS_REG)\n3771:\t\t\ttarget_host-\u003emax_segment_size = ib_dma_max_seg_size(ibdev);\n3772:\t\telse\n3773:\t\t\ttarget_host-\u003evirt_boundary_mask = ~srp_dev-\u003emr_page_mask;\n3774:\t\n3775:\t\ttarget = host_to_target(target_host);\n3776:\t\n3777:\t\ttarget-\u003enet\t\t= to_net_ns(kobj_ns_grab_current(KOBJ_NS_TYPE_NET));\n3778:\t\ttarget-\u003eio_class\t= SRP_REV16A_IB_IO_CLASS;\n3779:\t\ttarget-\u003escsi_host\t= target_host;\n3780:\t\ttarget-\u003esrp_host\t= host;\n3781:\t\ttarget-\u003elkey\t\t= host-\u003esrp_dev-\u003epd-\u003elocal_dma_lkey;\n3782:\t\ttarget-\u003eglobal_rkey\t= host-\u003esrp_dev-\u003eglobal_rkey;\n3783:\t\ttarget-\u003ecmd_sg_cnt\t= cmd_sg_entries;\n3784:\t\ttarget-\u003esg_tablesize\t= indirect_sg_entries ? : cmd_sg_entries;\n3785:\t\ttarget-\u003eallow_ext_sg\t= allow_ext_sg;\n3786:\t\ttarget-\u003etl_retry_count\t= 7;\n3787:\t\ttarget-\u003equeue_size\t= SRP_DEFAULT_QUEUE_SIZE;\n3788:\t\n3789:\t\t/*\n3790:\t\t * Avoid that the SCSI host can be removed by srp_remove_target()\n3791:\t\t * before this function returns.\n3792:\t\t */\n3793:\t\tscsi_host_get(target-\u003escsi_host);\n3794:\t\n3795:\t\tret = mutex_lock_interruptible(\u0026host-\u003eadd_target_mutex);\n3796:\t\tif (ret \u003c 0)\n3797:\t\t\tgoto put;\n3798:\t\n3799:\t\tret = srp_parse_options(target-\u003enet, buf, target);\n"
} |
| 23/2 | 2026/11/02 10:49 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20451 output: 39 thoughts: 2044 Thoughts: **RDMA SRP Code Analysis for Fuzzing Reachability** Okay, so I'm looking at this `add_target_store` function and how it sets up connections using RDMA. The patch I'm examining modifies `ib_srp.c`, specifically `srp_recv_done` and `srp_cm_rep_handler`. My immediate thought is, can this code *actually* run in a typical virtualized environment like QEMU or GCE? Can `ib_srp` receive completions or login responses? And can an SRP target even be set up locally? I need to figure out if it's reachable. Let's check the target driver, `drivers/infiniband/ulp/srpt/`. Since I'm looking at the core of SRP, this would be a good place to look for connectivity. I remember that userspace can act as an RDMA target, or communicate via `rdma_rxe` and `siw` right? Yep, `rdma_rxe` allows loopback RDMA! But does syzkaller test this? There are no declared tools to search syzkaller files, so I need to carefully evaluate reachability. The instructions emphasize that fuzzing only works on code that *can* execute in standard virtualized environments. The "reachability is the primary gate". Code that requires specific hardware or is structurally unreachable isn't worth fuzzing. The key is to avoid vendor-specific hardware or driver tear-down code that runs only on physical unplug. Now, is `INFINIBAND_SRP` vendor-specific or reliant on physical hardware? I need to check the dependencies. Looking at `drivers/infiniband/ulp/srp/Kconfig`, it *only* depends on `SCSI` and `INFINIBAND_ADDR_TRANS` (which itself depends on `INFINIBAND`). Neither requires physical hardware! `INFINIBAND_ADDR_TRANS` is a generic kernel subsystem. So, `ib_srp` is *not* a vendor-specific PCIe driver. It's an RDMA Upper Layer Protocol (ULP) that runs on top of the generic RDMA subsystem, which, crucially, supports software RDMA drivers like `rdma_rxe` and `siw`. I need to verify that `ib_srp.c` doesn't have device restrictions. This code is likely reachable through loopback or virtio-net. |
| 24/2 | 2026/11/02 10:49 | tool | grepper |
0mArgs:{
"Expression": "srp_add_one",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=138=MODULE_PARM_DESC(ch_count,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-140-\ndrivers/infiniband/ulp/srp/ib_srp.c:141:static int srp_add_one(struct ib_device *device);\ndrivers/infiniband/ulp/srp/ib_srp.c-142-static void srp_remove_one(struct ib_device *device, void *client_data);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=155=static struct ib_client srp_client = {\ndrivers/infiniband/ulp/srp/ib_srp.c-156-\t.name = \"srp\",\ndrivers/infiniband/ulp/srp/ib_srp.c:157:\t.add = srp_add_one,\ndrivers/infiniband/ulp/srp/ib_srp.c-158-\t.remove = srp_remove_one,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=4047=static void srp_rename_dev(struct ib_device *device, void *client_data)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-4060-\ndrivers/infiniband/ulp/srp/ib_srp.c:4061:static int srp_add_one(struct ib_device *device)\ndrivers/infiniband/ulp/srp/ib_srp.c-4062-{\n"
} |
| 25/2 | 2026/11/02 10:49 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 23508 output: 47 thoughts: 12 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Analyzing the Function Call** Alright, the instruction is to "read `srp_add_one`". Immediately, my mind starts to fill with context. Given the naming convention, `srp_` likely indicates something related to a specific protocol or module. "Add_one" is pretty straightforward: it's a function that increments something by one. The key questions now are: what is being incremented, how is it being done, and what potential side effects exist? Is this a simple integer increment, or is it more complex, perhaps dealing with pointers, object references, or some kind of custom data type? The "SRP" prefix is interesting: is this a Single Responsibility Principle (SRP) implementation, or something specific to an SRP (Secure Remote Password) algorithm, for example? I'm already mentally creating a list of hypotheses to test as I begin to dig deeper. Let's see what's actually under the hood. Time to get coding! |
| 26/2 | 2026/11/02 10:49 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 4061,
"LineCount": 70
}Results: {
"Contents": "4061:\tstatic int srp_add_one(struct ib_device *device)\n4062:\t{\n4063:\t\tstruct srp_device *srp_dev;\n4064:\t\tstruct ib_device_attr *attr = \u0026device-\u003eattrs;\n4065:\t\tstruct srp_host *host;\n4066:\t\tint mr_page_shift;\n4067:\t\tu32 p;\n4068:\t\tu64 max_pages_per_mr;\n4069:\t\tunsigned int flags = 0;\n4070:\t\n4071:\t\tsrp_dev = kzalloc_obj(*srp_dev);\n4072:\t\tif (!srp_dev)\n4073:\t\t\treturn -ENOMEM;\n4074:\t\n4075:\t\t/*\n4076:\t\t * Use the smallest page size supported by the HCA, down to a\n4077:\t\t * minimum of 4096 bytes. We're unlikely to build large sglists\n4078:\t\t * out of smaller entries.\n4079:\t\t */\n4080:\t\tmr_page_shift\t\t= max(12, ffs(attr-\u003epage_size_cap) - 1);\n4081:\t\tsrp_dev-\u003emr_page_size\t= 1 \u003c\u003c mr_page_shift;\n4082:\t\tsrp_dev-\u003emr_page_mask\t= ~((u64) srp_dev-\u003emr_page_size - 1);\n4083:\t\tmax_pages_per_mr\t= attr-\u003emax_mr_size;\n4084:\t\tdo_div(max_pages_per_mr, srp_dev-\u003emr_page_size);\n4085:\t\tpr_debug(\"%s: %llu / %u = %llu \u003c\u003e %u\\n\", __func__,\n4086:\t\t\t attr-\u003emax_mr_size, srp_dev-\u003emr_page_size,\n4087:\t\t\t max_pages_per_mr, SRP_MAX_PAGES_PER_MR);\n4088:\t\tsrp_dev-\u003emax_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,\n4089:\t\t\t\t\t\t max_pages_per_mr);\n4090:\t\n4091:\t\tsrp_dev-\u003ehas_fr = (attr-\u003edevice_cap_flags \u0026\n4092:\t\t\t\t IB_DEVICE_MEM_MGT_EXTENSIONS);\n4093:\t\tif (!never_register \u0026\u0026 !srp_dev-\u003ehas_fr)\n4094:\t\t\tdev_warn(\u0026device-\u003edev, \"FR is not supported\\n\");\n4095:\t\telse if (!never_register \u0026\u0026\n4096:\t\t\t attr-\u003emax_mr_size \u003e= 2 * srp_dev-\u003emr_page_size)\n4097:\t\t\tsrp_dev-\u003euse_fast_reg = srp_dev-\u003ehas_fr;\n4098:\t\n4099:\t\tif (never_register || !register_always || !srp_dev-\u003ehas_fr)\n4100:\t\t\tflags |= IB_PD_UNSAFE_GLOBAL_RKEY;\n4101:\t\n4102:\t\tif (srp_dev-\u003euse_fast_reg) {\n4103:\t\t\tsrp_dev-\u003emax_pages_per_mr =\n4104:\t\t\t\tmin_t(u32, srp_dev-\u003emax_pages_per_mr,\n4105:\t\t\t\t attr-\u003emax_fast_reg_page_list_len);\n4106:\t\t}\n4107:\t\tsrp_dev-\u003emr_max_size\t= srp_dev-\u003emr_page_size *\n4108:\t\t\t\t\t srp_dev-\u003emax_pages_per_mr;\n4109:\t\tpr_debug(\"%s: mr_page_shift = %d, device-\u003emax_mr_size = %#llx, device-\u003emax_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\\n\",\n4110:\t\t\t dev_name(\u0026device-\u003edev), mr_page_shift, attr-\u003emax_mr_size,\n4111:\t\t\t attr-\u003emax_fast_reg_page_list_len,\n4112:\t\t\t srp_dev-\u003emax_pages_per_mr, srp_dev-\u003emr_max_size);\n4113:\t\n4114:\t\tINIT_LIST_HEAD(\u0026srp_dev-\u003edev_list);\n4115:\t\n4116:\t\tsrp_dev-\u003edev = device;\n4117:\t\tsrp_dev-\u003epd = ib_alloc_pd(device, flags);\n4118:\t\tif (IS_ERR(srp_dev-\u003epd)) {\n4119:\t\t\tint ret = PTR_ERR(srp_dev-\u003epd);\n4120:\t\n4121:\t\t\tkfree(srp_dev);\n4122:\t\t\treturn ret;\n4123:\t\t}\n4124:\t\n4125:\t\tif (flags \u0026 IB_PD_UNSAFE_GLOBAL_RKEY) {\n4126:\t\t\tsrp_dev-\u003eglobal_rkey = srp_dev-\u003epd-\u003eunsafe_global_rkey;\n4127:\t\t\tWARN_ON_ONCE(srp_dev-\u003eglobal_rkey == 0);\n4128:\t\t}\n4129:\t\n4130:\t\trdma_for_each_port (device, p) {\n"
} |
| 27/2 | 2026/11/02 10:49 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25204 output: 47 thoughts: 14 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Delving Deeper: `srp_add_one` Investigation** Right, so we're looking at code, and my mental radar's pinging on `srp_add_one`. My immediate thought is, let's just *see* what this function's doing. No assumptions, no jumping to conclusions. I need the raw data, the actual implementation. It's time to dive into that specific function. I'm expecting this to be a crucial component in whatever broader system we're examining, because we are here. Time to get down to it, and see the details. |
| 28/2 | 2026/11/02 10:49 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 4130,
"LineCount": 35
}Results: {
"Contents": "4130:\t\trdma_for_each_port (device, p) {\n4131:\t\t\thost = srp_add_port(srp_dev, p);\n4132:\t\t\tif (host)\n4133:\t\t\t\tlist_add_tail(\u0026host-\u003elist, \u0026srp_dev-\u003edev_list);\n4134:\t\t}\n4135:\t\n4136:\t\tib_set_client_data(device, \u0026srp_client, srp_dev);\n4137:\t\treturn 0;\n4138:\t}\n4139:\t\n4140:\tstatic void srp_remove_one(struct ib_device *device, void *client_data)\n4141:\t{\n4142:\t\tstruct srp_device *srp_dev;\n4143:\t\tstruct srp_host *host, *tmp_host;\n4144:\t\tstruct srp_target_port *target;\n4145:\t\n4146:\t\tsrp_dev = client_data;\n4147:\t\n4148:\t\tlist_for_each_entry_safe(host, tmp_host, \u0026srp_dev-\u003edev_list, list) {\n4149:\t\t\t/*\n4150:\t\t\t * Remove the add_target sysfs entry so that no new target ports\n4151:\t\t\t * can be created.\n4152:\t\t\t */\n4153:\t\t\tdevice_del(\u0026host-\u003edev);\n4154:\t\n4155:\t\t\t/*\n4156:\t\t\t * Remove all target ports.\n4157:\t\t\t */\n4158:\t\t\tspin_lock(\u0026host-\u003etarget_lock);\n4159:\t\t\tlist_for_each_entry(target, \u0026host-\u003etarget_list, list)\n4160:\t\t\t\tsrp_queue_remove_work(target);\n4161:\t\t\tspin_unlock(\u0026host-\u003etarget_lock);\n4162:\t\n4163:\t\t\t/*\n4164:\t\t\t * srp_queue_remove_work() queues a call to\n"
} |
| 29/2 | 2026/11/02 10:49 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 25957 output: 47 thoughts: 15 Thoughts: Okay, let's dive into this. Here's my take on those thoughts, as if they're my own: **Investigating `srp_add_port`** Alright, time to get my hands dirty. I need to understand the function `srp_add_port`. I know SRP, I know port management, but let's see how *this* particular function handles the intricacies of adding a port to whatever system it's managing. I'm especially interested in the nuances of its implementation – the error handling, any resource allocation, how it interacts with the underlying hardware or driver, and of course, how it interacts with the SRP protocol itself. What are the key elements of its design? Is this a relatively straightforward function, or is there some clever logic baked in that I need to unpack? I'm expecting to see things like sanity checks, resource locking, and probably some sort of notification mechanism for the rest of the system. Let's see if my initial assumptions align with the actual code. Let's get to the bottom of this! |
| 30/2 | 2026/11/02 10:49 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 4015,
"LineCount": 40
}Results: {
"Contents": "4015:\t};\n4016:\t\n4017:\tstatic struct srp_host *srp_add_port(struct srp_device *device, u32 port)\n4018:\t{\n4019:\t\tstruct srp_host *host;\n4020:\t\n4021:\t\thost = kzalloc_obj(*host);\n4022:\t\tif (!host)\n4023:\t\t\treturn NULL;\n4024:\t\n4025:\t\tINIT_LIST_HEAD(\u0026host-\u003etarget_list);\n4026:\t\tspin_lock_init(\u0026host-\u003etarget_lock);\n4027:\t\tmutex_init(\u0026host-\u003eadd_target_mutex);\n4028:\t\thost-\u003esrp_dev = device;\n4029:\t\thost-\u003eport = port;\n4030:\t\n4031:\t\tdevice_initialize(\u0026host-\u003edev);\n4032:\t\thost-\u003edev.class = \u0026srp_class;\n4033:\t\thost-\u003edev.parent = device-\u003edev-\u003edev.parent;\n4034:\t\tif (dev_set_name(\u0026host-\u003edev, \"srp-%s-%u\", dev_name(\u0026device-\u003edev-\u003edev),\n4035:\t\t\t\t port))\n4036:\t\t\tgoto put_host;\n4037:\t\tif (device_add(\u0026host-\u003edev))\n4038:\t\t\tgoto put_host;\n4039:\t\n4040:\t\treturn host;\n4041:\t\n4042:\tput_host:\n4043:\t\tput_device(\u0026host-\u003edev);\n4044:\t\treturn NULL;\n4045:\t}\n4046:\t\n4047:\tstatic void srp_rename_dev(struct ib_device *device, void *client_data)\n4048:\t{\n4049:\t\tstruct srp_device *srp_dev = client_data;\n4050:\t\tstruct srp_host *host, *tmp_host;\n4051:\t\n4052:\t\tlist_for_each_entry_safe(host, tmp_host, \u0026srp_dev-\u003edev_list, list) {\n4053:\t\t\tchar name[IB_DEVICE_NAME_MAX + 8];\n4054:\t\n"
} |
| 31/2 | 2026/11/02 10:49 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 26839 output: 39 thoughts: 1271 Thoughts: **WorthFuzzing Evaluation for SRP Initiator Code** Okay, so I'm looking at this patch and how it impacts the SRP initiator implementation. My initial thought is that the SRP initiator is reachable. I see that whenever an RDMA device is created (like with `rdma link add rxe0` or `siw_dev`), this triggers the creation of `/sys/class/infiniband_srp/srp-rxe0-1/add_target`. Writing to `add_target` then kicks off a chain: `add_target_store` -> `srp_parse_options`, `srp_new_rdma_cm_id`, `srp_connect_ch`, `srp_send_req`, etc. And when connections are established or responses are received, `srp_cm_rep_handler` takes care of the login responses, and `srp_recv_done` handles incoming SRP responses. Now, focusing on the patch, it looks like it modifies `srp_recv_done` and `srp_cm_rep_handler`. Specifically, `srp_recv_done` has a DMA synchronization change related to the data size, and `srp_cm_rep_handler` now includes a check to ensure `max_ti_iu_len` reported by the target is large enough to contain an SRP response. That's a potentially important addition, a defensive check. The next question is, are these functions even *reachable* in a fuzzing context? They're in `drivers/infiniband/ulp/srp/ib_srp.c`, which is part of the SRP initiator implementation. Yes, that is reachable! Now, let's apply the fuzzing criteria. The instructions are clear: *Reachable* code is the primary gate. Is this code structurally unreachable? Let's review the negative criteria. It's not non-kernel. It's not non-executable. It's not vendor-specific hardware requiring special physical cards. It's not a driver teardown callback. It's not architecture-specific code. This is a protocol driver, accessible via virtual buses, loopback, and sysfs/RDMA CM. Thus, *it is not strictly within any of the negative criteria*. Therefore, by process of elimination, and according to the positive criteria, I conclude this *is* WorthFuzzing=true. Wait, I need to verify something though: are the modified functions static or global? Let's check `srp_recv_done`! Aha! It is declared `static`. So `srp_recv_done` *is* static! What does that mean for inlining? Time to review where `srp_recv_done` is referenced! That will help inform whether fuzzing is beneficial! |
| 32/2 | 2026/11/02 10:50 | tool | grepper |
0mArgs:{
"Expression": "srp_recv_done",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=143=static void srp_rename_dev(struct ib_device *device, void *client_data);\ndrivers/infiniband/ulp/srp/ib_srp.c:144:static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);\ndrivers/infiniband/ulp/srp/ib_srp.c-145-static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=1921=static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-1930-\ndrivers/infiniband/ulp/srp/ib_srp.c:1931:\tiu-\u003ecqe.done = srp_recv_done;\ndrivers/infiniband/ulp/srp/ib_srp.c-1932-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2075=static void srp_process_aer_req(struct srp_rdma_ch *ch,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2099-\ndrivers/infiniband/ulp/srp/ib_srp.c:2100:static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\ndrivers/infiniband/ulp/srp/ib_srp.c-2101-{\n"
} |
| 33/2 | 2026/11/02 10:50 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 29215 output: 41 thoughts: 116 Thoughts: Okay, let's break this down. **Analyzing Function Pointers and Inlining** Alright, that line there: `iu->cqe.done = srp_recv_done;` - that's interesting. I see that the address of `srp_recv_done` is being assigned to `iu->cqe.done`, and it's being treated as a function pointer. This means the compiler is *forced* to keep a separate symbol for it, whether it's in the kernel's `vmlinux` or a loadable module. It can't just inline that function call, which has implications for optimization and debugging, because the address is being explicitly stored and used. Now I need to check the potential for `srp_cm_rep_handler` being inlined. The next thing is to look at how `srp_cm_rep_handler` is used. Where is it called? By tracing its uses I can determine whether it's potentially inlined by the compiler. |
| 34/2 | 2026/11/02 10:50 | tool | grepper |
0mArgs:{
"Expression": "srp_cm_rep_handler",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=2343=static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2369-\ndrivers/infiniband/ulp/srp/ib_srp.c:2370:static void srp_cm_rep_handler(struct ib_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c-2371-\t\t\t const struct srp_login_rsp *lrsp,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2555=static int srp_ib_cm_handler(struct ib_cm_id *cm_id,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2571-\t\tcomp = 1;\ndrivers/infiniband/ulp/srp/ib_srp.c:2572:\t\tsrp_cm_rep_handler(cm_id, event-\u003eprivate_data, ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-2573-\t\tbreak;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2667=static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2704-\t\tcomp = 1;\ndrivers/infiniband/ulp/srp/ib_srp.c:2705:\t\tsrp_cm_rep_handler(NULL, event-\u003eparam.conn.private_data, ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-2706-\t\tbreak;\n"
} |
| 35/2 | 2026/11/02 10:50 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 30089 output: 47 thoughts: 244 Thoughts: **Analyzing the SRP Connection Management Flow** Okay, so I'm looking at how SRP connection management works, specifically the calls to `srp_cm_rep_handler`. It's pretty clear that this function is central to the process, because it's called from both `srp_ib_cm_handler` and `srp_rdma_cm_handler`. First, I needed to confirm that the handlers I mentioned are indeed callbacks, and it looks like the code confirms this. `srp_new_ib_cm_id` creates an Infiniband CM ID using `ib_create_cm_id` and passes `srp_ib_cm_handler` as the callback. Similarly, `srp_new_rdma_cm_id` creates an RDMA CM ID via `rdma_create_id` and uses `srp_rdma_cm_handler` as a callback. Since `srp_cm_rep_handler` is called from both callbacks, it handles the connection management responses, that makes sense. I see that `srp_cm_rep_handler` is a sizable function, about 100 lines long, so I better understand it in detail. To get a better handle on this, I'm going to review lines 2370 to 2470 of `drivers/infiniband/ulp/srp/ib_srp.c`. That should give me a good picture of what's happening within that function. |
| 36/2 | 2026/11/02 10:50 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 2410,
"LineCount": 60
}Results: {
"Contents": "2410:\t\t\t\t= min_t(int, target-\u003escsi_host-\u003ecan_queue,\n2411:\t\t\t\t\ttarget-\u003escsi_host-\u003ecmd_per_lun);\n2412:\t\t} else {\n2413:\t\t\tshost_printk(KERN_WARNING, target-\u003escsi_host,\n2414:\t\t\t\t PFX \"Unhandled RSP opcode %#x\\n\", lrsp-\u003eopcode);\n2415:\t\t\tret = -ECONNRESET;\n2416:\t\t\tgoto error;\n2417:\t\t}\n2418:\t\n2419:\t\tif (!ch-\u003erx_ring) {\n2420:\t\t\tret = srp_alloc_iu_bufs(ch);\n2421:\t\t\tif (ret)\n2422:\t\t\t\tgoto error;\n2423:\t\t}\n2424:\t\n2425:\t\tfor (i = 0; i \u003c target-\u003equeue_size; i++) {\n2426:\t\t\tstruct srp_iu *iu = ch-\u003erx_ring[i];\n2427:\t\n2428:\t\t\tret = srp_post_recv(ch, iu);\n2429:\t\t\tif (ret)\n2430:\t\t\t\tgoto error;\n2431:\t\t}\n2432:\t\n2433:\t\tif (!target-\u003eusing_rdma_cm) {\n2434:\t\t\tret = -ENOMEM;\n2435:\t\t\tqp_attr = kmalloc_obj(*qp_attr);\n2436:\t\t\tif (!qp_attr)\n2437:\t\t\t\tgoto error;\n2438:\t\n2439:\t\t\tqp_attr-\u003eqp_state = IB_QPS_RTR;\n2440:\t\t\tret = ib_cm_init_qp_attr(cm_id, qp_attr, \u0026attr_mask);\n2441:\t\t\tif (ret)\n2442:\t\t\t\tgoto error_free;\n2443:\t\n2444:\t\t\tret = ib_modify_qp(ch-\u003eqp, qp_attr, attr_mask);\n2445:\t\t\tif (ret)\n2446:\t\t\t\tgoto error_free;\n2447:\t\n2448:\t\t\tqp_attr-\u003eqp_state = IB_QPS_RTS;\n2449:\t\t\tret = ib_cm_init_qp_attr(cm_id, qp_attr, \u0026attr_mask);\n2450:\t\t\tif (ret)\n2451:\t\t\t\tgoto error_free;\n2452:\t\n2453:\t\t\ttarget-\u003erq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);\n2454:\t\n2455:\t\t\tret = ib_modify_qp(ch-\u003eqp, qp_attr, attr_mask);\n2456:\t\t\tif (ret)\n2457:\t\t\t\tgoto error_free;\n2458:\t\n2459:\t\t\tret = ib_send_cm_rtu(cm_id, NULL, 0);\n2460:\t\t}\n2461:\t\n2462:\terror_free:\n2463:\t\tkfree(qp_attr);\n2464:\t\n2465:\terror:\n2466:\t\tch-\u003estatus = ret;\n2467:\t}\n2468:\t\n2469:\tstatic void srp_ib_cm_rej_handler(struct ib_cm_id *cm_id,\n"
} |
| 37/2 | 2026/11/02 10:50 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 31597 output: 39 thoughts: 558 Thoughts: **Focusing on Function Inclusion** Okay, let's nail down which functions are crucial for inclusion in FocusSymbols. The patch directly touches `srp_recv_done` and `srp_cm_rep_handler`. My initial thought is whether we can inline `srp_cm_rep_handler` into `srp_ib_cm_handler` or `srp_rdma_cm_handler`. Given that `srp_cm_rep_handler` is called from *two* places, the compiler's probably not going to automatically inline it unless LTO or size optimizations are in play. However, I need to be thorough, so I'll consider whether either of the callers, `srp_ib_cm_handler` or `srp_rdma_cm_handler`, might make sense. To be sure, let's list them all: `srp_recv_done`, `srp_cm_rep_handler`, `srp_ib_cm_handler`, and `srp_rdma_cm_handler`. Ah, but wait, instruction four tells us to list functions that specifically implement the *altered* logic or are direct entrypoints. So, that means `srp_recv_done` and `srp_cm_rep_handler` are *exactly* what's modified! And, `srp_ib_cm_handler` and `srp_rdma_cm_handler` are their direct callers, handling the login response. Hmm, what about `srp_post_recv` or `add_target_store`? `srp_recv_done` calls `srp_post_recv`, but again, the modification is *specific* to `srp_recv_done` and `srp_cm_rep_handler`. So, the question is, are `srp_recv_done` and `srp_cm_rep_handler` enough? Or should I include their callers? I think including `srp_recv_done`, `srp_cm_rep_handler`, `srp_ib_cm_handler`, and `srp_rdma_cm_handler` should cover it - both the direct symbols and any potential inlining scenarios. Good. Now, on to the EnableConfigs. I need to figure out the relevant Kconfig options. I'll need to dig into `drivers/infiniband/ulp/srp/Makefile`, `drivers/infiniband/ulp/srp/Kconfig`, and parent Kconfigs. That should give me what I need. |
| 38/2 | 2026/11/02 10:50 | tool | read-file |
0mError:the file does not exist Args: {
"File": "drivers/infiniband/ulp/srp/Makefile",
"FirstLine": 1,
"LineCount": 10
}Results: {
"error": "the file does not exist"
} |
| 39/2 | 2026/11/02 10:50 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 32767 output: 26 thoughts: 36 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Debugging a Missing Makefile** Right, so I'm digging around in the kernel source, specifically looking for the Makefile associated with `drivers/infiniband/ulp/srp`. Hmm, it's not where I instinctively expected it to be. Time to take a step back and zoom out a bit. Let me check the parent directory, `drivers/infiniband/ulp/`, to see if the build system has been organized differently than I initially assumed. Maybe the SRP build process has been modularized or handled in a more generic way within the ULP framework. Let's see what we can find there. This is where I'd normally start looking for clues about the overall build structure. |
| 40/2 | 2026/11/02 10:50 | tool | codesearch-dir-index |
0mArgs:{
"Dir": "drivers/infiniband/ulp"
}Results: {
"Files": null,
"Subdirs": [
"ipoib",
"iser",
"isert",
"rtrs",
"srp",
"srpt"
]
} |
| 41/2 | 2026/11/02 10:50 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 33038 output: 29 thoughts: 17 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: **Diving into the SRP Driver** Alright, time to refocus. Let's see... the problem is likely related to the SRP stack. I need to get my head back into that code. My immediate thought is to start with the `drivers/infiniband/ulp/srp` directory. That's the logical starting point for investigating anything SRP-related. Let's see what's happening there, understand its structure, refresh my memory on the interactions with the HCA, and the likely data structures. From there I'll drill down to relevant files and functions. I need to quickly identify the modules involved in the error. Gotta get to the root of this. |
| 42/2 | 2026/11/02 10:50 | tool | codesearch-dir-index |
0mArgs:{
"Dir": "drivers/infiniband/ulp/srp"
}Results: {
"Files": [
"ib_srp.c",
"ib_srp.h"
],
"Subdirs": null
} |
| 43/2 | 2026/11/02 10:50 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 33282 output: 30 thoughts: 36 Thoughts: Here's my thought process, as requested: **Navigating the Infiniband Makefile Hunt** Okay, so I need to find the Makefile related to Infiniband, likely to make changes to the existing build process, or perhaps just to understand its structure. Where would the relevant file logically reside? Given the common directory structure of the kernel, it's almost certainly nested within the `drivers/infiniband/` directory. Now, within *that* directory, there's a good chance it's in `drivers/infiniband/ulp/Makefile` considering ULP drivers are a pretty common sub-component. But it could also just be a top-level Makefile in `drivers/infiniband/`. I'll have to investigate and see which one, or both, are present and where the appropriate one is. It's time to check the file system. |
| 44/2 | 2026/11/02 10:50 | tool | grepper |
0mArgs:{
"Expression": "srp",
"PathPrefixes": [
"drivers/infiniband/"
]
}Results: {
"Output": "\nFull output is too long, showing 200 out of 4111 lines.\nUse more precise expression or PathPrefixes if possible.\n\nNumber of matching lines per file (12 files in total):\ndrivers/infiniband/Kconfig:2\ndrivers/infiniband/hw/mthca/mthca_cq.c:4\ndrivers/infiniband/hw/mthca/mthca_eq.c:3\ndrivers/infiniband/hw/mthca/mthca_srq.c:4\ndrivers/infiniband/ulp/Makefile:2\ndrivers/infiniband/ulp/srp/Kbuild:1\ndrivers/infiniband/ulp/srp/ib_srp.c:637\ndrivers/infiniband/ulp/srp/ib_srp.h:37\ndrivers/infiniband/ulp/srpt/Makefile:1\ndrivers/infiniband/ulp/srpt/ib_dm_mad.h:1\ndrivers/infiniband/ulp/srpt/ib_srpt.c:665\ndrivers/infiniband/ulp/srpt/ib_srpt.h:67\n\ndrivers/infiniband/Kconfig=109=source \"drivers/infiniband/ulp/ipoib/Kconfig\"\ndrivers/infiniband/Kconfig-110-\ndrivers/infiniband/Kconfig:111:source \"drivers/infiniband/ulp/srp/Kconfig\"\ndrivers/infiniband/Kconfig:112:source \"drivers/infiniband/ulp/srpt/Kconfig\"\ndrivers/infiniband/Kconfig-113-\n--\ndrivers/infiniband/hw/mthca/mthca_cq.c=64=struct mthca_cq_context {\n--\ndrivers/infiniband/hw/mthca/mthca_cq.c-66-\t__be64 start;\ndrivers/infiniband/hw/mthca/mthca_cq.c:67:\t__be32 logsize_usrpage;\ndrivers/infiniband/hw/mthca/mthca_cq.c-68-\t__be32 error_eqn;\t/* Tavor only */\n--\ndrivers/infiniband/hw/mthca/mthca_cq.c=769=int mthca_init_cq(struct mthca_dev *dev, int nent,\n--\ndrivers/infiniband/hw/mthca/mthca_cq.c-828-\t\t\t\t\t\t MTHCA_CQ_FLAG_TR);\ndrivers/infiniband/hw/mthca/mthca_cq.c:829:\tcq_context-\u003elogsize_usrpage = cpu_to_be32((ffs(nent) - 1) \u003c\u003c 24);\ndrivers/infiniband/hw/mthca/mthca_cq.c-830-\tif (ctx)\ndrivers/infiniband/hw/mthca/mthca_cq.c:831:\t\tcq_context-\u003elogsize_usrpage |= cpu_to_be32(ctx-\u003euar.index);\ndrivers/infiniband/hw/mthca/mthca_cq.c-832-\telse\ndrivers/infiniband/hw/mthca/mthca_cq.c:833:\t\tcq_context-\u003elogsize_usrpage |= cpu_to_be32(dev-\u003edriver_uar.index);\ndrivers/infiniband/hw/mthca/mthca_cq.c-834-\tcq_context-\u003eerror_eqn = cpu_to_be32(dev-\u003eeq_table.eq[MTHCA_EQ_ASYNC].eqn);\n--\ndrivers/infiniband/hw/mthca/mthca_eq.c=53=struct mthca_eq_context {\n--\ndrivers/infiniband/hw/mthca/mthca_eq.c-55-\t__be64 start;\ndrivers/infiniband/hw/mthca/mthca_eq.c:56:\t__be32 logsize_usrpage;\ndrivers/infiniband/hw/mthca/mthca_eq.c-57-\t__be32 tavor_pd;\t/* reserved for Arbel */\n--\ndrivers/infiniband/hw/mthca/mthca_eq.c=465=static int mthca_create_eq(struct mthca_dev *dev,\n--\ndrivers/infiniband/hw/mthca/mthca_eq.c-533-\ndrivers/infiniband/hw/mthca/mthca_eq.c:534:\teq_context-\u003elogsize_usrpage = cpu_to_be32((ffs(eq-\u003enent) - 1) \u003c\u003c 24);\ndrivers/infiniband/hw/mthca/mthca_eq.c-535-\tif (mthca_is_memfree(dev)) {\n--\ndrivers/infiniband/hw/mthca/mthca_eq.c-537-\t} else {\ndrivers/infiniband/hw/mthca/mthca_eq.c:538:\t\teq_context-\u003elogsize_usrpage |= cpu_to_be32(dev-\u003edriver_uar.index);\ndrivers/infiniband/hw/mthca/mthca_eq.c-539-\t\teq_context-\u003etavor_pd = cpu_to_be32(dev-\u003edriver_pd.pd_num);\n--\ndrivers/infiniband/hw/mthca/mthca_srq.c=60=struct mthca_arbel_srq_context {\n--\ndrivers/infiniband/hw/mthca/mthca_srq.c-63-\t__be32 db_index;\ndrivers/infiniband/hw/mthca/mthca_srq.c:64:\t__be32 logstride_usrpage;\ndrivers/infiniband/hw/mthca/mthca_srq.c-65-\t__be64 wqe_base;\n--\ndrivers/infiniband/hw/mthca/mthca_srq.c=118=static void mthca_arbel_init_srq_context(struct mthca_dev *dev,\n--\ndrivers/infiniband/hw/mthca/mthca_srq.c-138-\tcontext-\u003edb_index = cpu_to_be32(srq-\u003edb_index);\ndrivers/infiniband/hw/mthca/mthca_srq.c:139:\tcontext-\u003elogstride_usrpage = cpu_to_be32((srq-\u003ewqe_shift - 4) \u003c\u003c 29);\ndrivers/infiniband/hw/mthca/mthca_srq.c-140-\tif (udata)\ndrivers/infiniband/hw/mthca/mthca_srq.c:141:\t\tcontext-\u003elogstride_usrpage |= cpu_to_be32(ucontext-\u003euar.index);\ndrivers/infiniband/hw/mthca/mthca_srq.c-142-\telse\ndrivers/infiniband/hw/mthca/mthca_srq.c:143:\t\tcontext-\u003elogstride_usrpage |= cpu_to_be32(dev-\u003edriver_uar.index);\ndrivers/infiniband/hw/mthca/mthca_srq.c-144-\tcontext-\u003eeq_pd = cpu_to_be32(MTHCA_EQ_ASYNC \u003c\u003c 24 | pd-\u003epd_num);\n--\ndrivers/infiniband/ulp/Makefile=2=obj-$(CONFIG_INFINIBAND_IPOIB)\t\t+= ipoib/\ndrivers/infiniband/ulp/Makefile:3:obj-$(CONFIG_INFINIBAND_SRP)\t\t+= srp/\ndrivers/infiniband/ulp/Makefile:4:obj-$(CONFIG_INFINIBAND_SRPT)\t\t+= srpt/\ndrivers/infiniband/ulp/Makefile-5-obj-$(CONFIG_INFINIBAND_ISER)\t\t+= iser/\n--\ndrivers/infiniband/ulp/srp/Kbuild-1-# SPDX-License-Identifier: GPL-2.0\ndrivers/infiniband/ulp/srp/Kbuild:2:obj-$(CONFIG_INFINIBAND_SRP)\t\t\t+= ib_srp.o\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-54-#include \u003cscsi/scsi_tcq.h\u003e\ndrivers/infiniband/ulp/srp/ib_srp.c:55:#include \u003cscsi/srp.h\u003e\ndrivers/infiniband/ulp/srp/ib_srp.c:56:#include \u003cscsi/scsi_transport_srp.h\u003e\ndrivers/infiniband/ulp/srp/ib_srp.c-57-\ndrivers/infiniband/ulp/srp/ib_srp.c:58:#include \"ib_srp.h\"\ndrivers/infiniband/ulp/srp/ib_srp.c-59-\ndrivers/infiniband/ulp/srp/ib_srp.c:60:#define DRV_NAME\t\"ib_srp\"\ndrivers/infiniband/ulp/srp/ib_srp.c-61-#define PFX\t\tDRV_NAME \": \"\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=65=MODULE_LICENSE(\"Dual BSD/GPL\");\ndrivers/infiniband/ulp/srp/ib_srp.c-66-\ndrivers/infiniband/ulp/srp/ib_srp.c:67:static unsigned int srp_sg_tablesize;\ndrivers/infiniband/ulp/srp/ib_srp.c-68-static unsigned int cmd_sg_entries;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=73=static int topspin_workarounds = 1;\ndrivers/infiniband/ulp/srp/ib_srp.c-74-\ndrivers/infiniband/ulp/srp/ib_srp.c:75:module_param(srp_sg_tablesize, uint, 0444);\ndrivers/infiniband/ulp/srp/ib_srp.c:76:MODULE_PARM_DESC(srp_sg_tablesize, \"Deprecated name for cmd_sg_entries\");\ndrivers/infiniband/ulp/srp/ib_srp.c-77-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=99=MODULE_PARM_DESC(never_register, \"Never register memory\");\ndrivers/infiniband/ulp/srp/ib_srp.c-100-\ndrivers/infiniband/ulp/srp/ib_srp.c:101:static const struct kernel_param_ops srp_tmo_ops;\ndrivers/infiniband/ulp/srp/ib_srp.c-102-\ndrivers/infiniband/ulp/srp/ib_srp.c:103:static int srp_reconnect_delay = 10;\ndrivers/infiniband/ulp/srp/ib_srp.c:104:module_param_cb(reconnect_delay, \u0026srp_tmo_ops, \u0026srp_reconnect_delay,\ndrivers/infiniband/ulp/srp/ib_srp.c-105-\t\tS_IRUGO | S_IWUSR);\ndrivers/infiniband/ulp/srp/ib_srp.c=106=MODULE_PARM_DESC(reconnect_delay, \"Time between successive reconnect attempts\");\ndrivers/infiniband/ulp/srp/ib_srp.c-107-\ndrivers/infiniband/ulp/srp/ib_srp.c:108:static int srp_fast_io_fail_tmo = 15;\ndrivers/infiniband/ulp/srp/ib_srp.c:109:module_param_cb(fast_io_fail_tmo, \u0026srp_tmo_ops, \u0026srp_fast_io_fail_tmo,\ndrivers/infiniband/ulp/srp/ib_srp.c-110-\t\tS_IRUGO | S_IWUSR);\ndrivers/infiniband/ulp/srp/ib_srp.c=111=MODULE_PARM_DESC(fast_io_fail_tmo,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-115-\ndrivers/infiniband/ulp/srp/ib_srp.c:116:static int srp_dev_loss_tmo = 600;\ndrivers/infiniband/ulp/srp/ib_srp.c:117:module_param_cb(dev_loss_tmo, \u0026srp_tmo_ops, \u0026srp_dev_loss_tmo,\ndrivers/infiniband/ulp/srp/ib_srp.c-118-\t\tS_IRUGO | S_IWUSR);\ndrivers/infiniband/ulp/srp/ib_srp.c=119=MODULE_PARM_DESC(dev_loss_tmo,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-126-\ndrivers/infiniband/ulp/srp/ib_srp.c:127:static bool srp_use_imm_data = true;\ndrivers/infiniband/ulp/srp/ib_srp.c:128:module_param_named(use_imm_data, srp_use_imm_data, bool, 0644);\ndrivers/infiniband/ulp/srp/ib_srp.c-129-MODULE_PARM_DESC(use_imm_data,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-131-\ndrivers/infiniband/ulp/srp/ib_srp.c:132:static unsigned int srp_max_imm_data = 8 * 1024;\ndrivers/infiniband/ulp/srp/ib_srp.c:133:module_param_named(max_imm_data, srp_max_imm_data, uint, 0644);\ndrivers/infiniband/ulp/srp/ib_srp.c-134-MODULE_PARM_DESC(max_imm_data, \"Maximum immediate data size.\");\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=138=MODULE_PARM_DESC(ch_count,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-140-\ndrivers/infiniband/ulp/srp/ib_srp.c:141:static int srp_add_one(struct ib_device *device);\ndrivers/infiniband/ulp/srp/ib_srp.c:142:static void srp_remove_one(struct ib_device *device, void *client_data);\ndrivers/infiniband/ulp/srp/ib_srp.c:143:static void srp_rename_dev(struct ib_device *device, void *client_data);\ndrivers/infiniband/ulp/srp/ib_srp.c:144:static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);\ndrivers/infiniband/ulp/srp/ib_srp.c:145:static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,\ndrivers/infiniband/ulp/srp/ib_srp.c-146-\t\tconst char *opname);\ndrivers/infiniband/ulp/srp/ib_srp.c:147:static int srp_ib_cm_handler(struct ib_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c-148-\t\t\t const struct ib_cm_event *event);\ndrivers/infiniband/ulp/srp/ib_srp.c:149:static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,\ndrivers/infiniband/ulp/srp/ib_srp.c-150-\t\t\t struct rdma_cm_event *event);\ndrivers/infiniband/ulp/srp/ib_srp.c-151-\ndrivers/infiniband/ulp/srp/ib_srp.c:152:static struct scsi_transport_template *ib_srp_transport_template;\ndrivers/infiniband/ulp/srp/ib_srp.c:153:static struct workqueue_struct *srp_remove_wq;\ndrivers/infiniband/ulp/srp/ib_srp.c-154-\ndrivers/infiniband/ulp/srp/ib_srp.c:155:static struct ib_client srp_client = {\ndrivers/infiniband/ulp/srp/ib_srp.c:156:\t.name = \"srp\",\ndrivers/infiniband/ulp/srp/ib_srp.c:157:\t.add = srp_add_one,\ndrivers/infiniband/ulp/srp/ib_srp.c:158:\t.remove = srp_remove_one,\ndrivers/infiniband/ulp/srp/ib_srp.c:159:\t.rename = srp_rename_dev\ndrivers/infiniband/ulp/srp/ib_srp.c-160-};\ndrivers/infiniband/ulp/srp/ib_srp.c-161-\ndrivers/infiniband/ulp/srp/ib_srp.c:162:static struct ib_sa_client srp_sa_client;\ndrivers/infiniband/ulp/srp/ib_srp.c-163-\ndrivers/infiniband/ulp/srp/ib_srp.c:164:static int srp_tmo_get(char *buffer, const struct kernel_param *kp)\ndrivers/infiniband/ulp/srp/ib_srp.c-165-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-173-\ndrivers/infiniband/ulp/srp/ib_srp.c:174:static int srp_tmo_set(const char *val, const struct kernel_param *kp)\ndrivers/infiniband/ulp/srp/ib_srp.c-175-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-177-\ndrivers/infiniband/ulp/srp/ib_srp.c:178:\tres = srp_parse_tmo(\u0026tmo, val);\ndrivers/infiniband/ulp/srp/ib_srp.c-179-\tif (res)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-181-\ndrivers/infiniband/ulp/srp/ib_srp.c:182:\tif (kp-\u003earg == \u0026srp_reconnect_delay)\ndrivers/infiniband/ulp/srp/ib_srp.c:183:\t\tres = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,\ndrivers/infiniband/ulp/srp/ib_srp.c:184:\t\t\t\t srp_dev_loss_tmo);\ndrivers/infiniband/ulp/srp/ib_srp.c:185:\telse if (kp-\u003earg == \u0026srp_fast_io_fail_tmo)\ndrivers/infiniband/ulp/srp/ib_srp.c:186:\t\tres = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);\ndrivers/infiniband/ulp/srp/ib_srp.c-187-\telse\ndrivers/infiniband/ulp/srp/ib_srp.c:188:\t\tres = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,\ndrivers/infiniband/ulp/srp/ib_srp.c-189-\t\t\t\t tmo);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-197-\ndrivers/infiniband/ulp/srp/ib_srp.c:198:static const struct kernel_param_ops srp_tmo_ops = {\ndrivers/infiniband/ulp/srp/ib_srp.c:199:\t.get = srp_tmo_get,\ndrivers/infiniband/ulp/srp/ib_srp.c:200:\t.set = srp_tmo_set,\ndrivers/infiniband/ulp/srp/ib_srp.c-201-};\ndrivers/infiniband/ulp/srp/ib_srp.c-202-\ndrivers/infiniband/ulp/srp/ib_srp.c:203:static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)\ndrivers/infiniband/ulp/srp/ib_srp.c-204-{\ndrivers/infiniband/ulp/srp/ib_srp.c:205:\treturn (struct srp_target_port *) host-\u003ehostdata;\ndrivers/infiniband/ulp/srp/ib_srp.c-206-}\ndrivers/infiniband/ulp/srp/ib_srp.c-207-\ndrivers/infiniband/ulp/srp/ib_srp.c:208:static const char *srp_target_info(struct Scsi_Host *host)\ndrivers/infiniband/ulp/srp/ib_srp.c-209-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-212-\ndrivers/infiniband/ulp/srp/ib_srp.c:213:static int srp_target_is_topspin(struct srp_target_port *target)\ndrivers/infiniband/ulp/srp/ib_srp.c-214-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-222-\ndrivers/infiniband/ulp/srp/ib_srp.c:223:static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,\ndrivers/infiniband/ulp/srp/ib_srp.c-224-\t\t\t\t gfp_t gfp_mask,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-226-{\ndrivers/infiniband/ulp/srp/ib_srp.c:227:\tstruct srp_iu *iu;\ndrivers/infiniband/ulp/srp/ib_srp.c-228-\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-236-\ndrivers/infiniband/ulp/srp/ib_srp.c:237:\tiu-\u003edma = ib_dma_map_single(host-\u003esrp_dev-\u003edev, iu-\u003ebuf, size,\ndrivers/infiniband/ulp/srp/ib_srp.c-238-\t\t\t\t direction);\ndrivers/infiniband/ulp/srp/ib_srp.c:239:\tif (ib_dma_mapping_error(host-\u003esrp_dev-\u003edev, iu-\u003edma))\ndrivers/infiniband/ulp/srp/ib_srp.c-240-\t\tgoto out_free_buf;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-254-\ndrivers/infiniband/ulp/srp/ib_srp.c:255:static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)\ndrivers/infiniband/ulp/srp/ib_srp.c-256-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-259-\ndrivers/infiniband/ulp/srp/ib_srp.c:260:\tib_dma_unmap_single(host-\u003esrp_dev-\u003edev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-261-\t\t\t iu-\u003edirection);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-265-\n\n"
} |
| 45/2 | 2026/11/02 10:51 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 39910 output: 36 thoughts: 141 Thoughts: **Examining Infiniband SRP Dependencies** Okay, let's dive into this. I need to understand the configuration dependencies for `INFINIBAND_SRP`. My initial thought is to check `drivers/infiniband/Kconfig` for the overall `INFINIBAND` dependencies and then drill down into the SRP-specific configuration. Alright, here we go, looking in `drivers/infiniband/ulp/srp/Kconfig`. Ah, there it is: `config INFINIBAND_SRP` depends on `SCSI` and `INFINIBAND_ADDR_TRANS`, and it *selects* `SCSI_SRP_ATTRS`. Makes sense. Now, that `INFINIBAND_ADDR_TRANS`... I remember seeing that one somewhere else. I need to find out what *that* depends on. Okay, let me go back to `drivers/infiniband/Kconfig` and see what's what with `INFINIBAND_ADDR_TRANS`. |
| 46/2 | 2026/11/02 10:51 | tool | grepper |
0mArgs:{
"Expression": "config INFINIBAND_ADDR_TRANS",
"PathPrefixes": [
"drivers/infiniband/"
]
}Results: {
"Output": "drivers/infiniband/Kconfig=51=config INFINIBAND_ON_DEMAND_PAGING\n--\ndrivers/infiniband/Kconfig-63-\ndrivers/infiniband/Kconfig:64:config INFINIBAND_ADDR_TRANS\ndrivers/infiniband/Kconfig-65-\tbool \"RDMA/CM\"\n--\ndrivers/infiniband/Kconfig-71-\ndrivers/infiniband/Kconfig:72:config INFINIBAND_ADDR_TRANS_CONFIGFS\ndrivers/infiniband/Kconfig-73-\tbool\n"
} |
| 47/2 | 2026/11/02 10:51 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 40453 output: 36 thoughts: 21 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Analyzing the Infiniband Kconfig File** Alright, I'm thinking we need to dive into the `drivers/infiniband/Kconfig` file, specifically around line 64. I'm guessing there's something specific in that section related to a recent change, issue, or configuration I'm trying to understand or modify. My immediate assumption is that line 64 is the likely spot because of some information I have about the project. Whether I'm debugging a build issue, looking at a new feature, or perhaps trying to trace a dependency, that seems to be the critical area to check in terms of understanding the existing state of the project. I'm preparing to parse the logic there – likely a conditional statement, a dependency definition, or maybe a configuration option declaration. From here I anticipate further analysis depending on what the code reveals. |
| 48/2 | 2026/11/02 10:51 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/Kconfig",
"FirstLine": 55,
"LineCount": 30
}Results: {
"Contents": " 55:\t\tselect INTERVAL_TREE\n 56:\t\tselect HMM_MIRROR\n 57:\t\tdefault y\n 58:\t\thelp\n 59:\t\t On demand paging support for the InfiniBand subsystem.\n 60:\t\t Together with driver support this allows registration of\n 61:\t\t memory regions without pinning their pages, fetching the\n 62:\t\t pages on demand instead.\n 63:\t\n 64:\tconfig INFINIBAND_ADDR_TRANS\n 65:\t\tbool \"RDMA/CM\"\n 66:\t\tdepends on INFINIBAND\n 67:\t\tdefault y\n 68:\t\thelp\n 69:\t\t Support for RDMA communication manager (CM).\n 70:\t\t This allows for a generic connection abstraction over RDMA.\n 71:\t\n 72:\tconfig INFINIBAND_ADDR_TRANS_CONFIGFS\n 73:\t\tbool\n 74:\t\tdepends on INFINIBAND_ADDR_TRANS \u0026\u0026 CONFIGFS_FS \u0026\u0026 !(INFINIBAND=y \u0026\u0026 CONFIGFS_FS=m)\n 75:\t\tdefault y\n 76:\t\thelp\n 77:\t\t ConfigFS support for RDMA communication manager (CM).\n 78:\t\t This allows the user to config the default GID type that the CM\n 79:\t\t uses for each device, when initiaing new connections.\n 80:\t\n 81:\tconfig INFINIBAND_VIRT_DMA\n 82:\t\tdef_bool !HIGHMEM\n 83:\t\n 84:\tif INFINIBAND_USER_ACCESS || !INFINIBAND_USER_ACCESS\n"
} |
| 49/2 | 2026/11/02 10:51 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 41120 output: 238 thoughts: 501 Thoughts: **Fuzzing Configuration for INFINIBAND_SRP** Okay, so I'm putting together a fuzzing configuration. `INFINIBAND_SRP`, the SCSI RDMA Protocol, is my target here. It depends on `SCSI` and `INFINIBAND_ADDR_TRANS`, which, in turn, needs `INFINIBAND`. Essentially, I'm setting up to potentially exercise the SRP driver, likely in conjunction with software RDMA layers like `RDMA_RXE` or `RDMA_SIW`. I confirmed that `INFINIBAND_SRP` *is* the primary config. The dependency chain is verified; `SCSI_SRP_ATTRS` is automatically selected by `INFINIBAND_SRP`. Now, for the `set-results` parameters. I need to define `WorthFuzzing`, `Reasoning`, `FocusSymbols`, and `EnableConfigs`. Let me review: * `WorthFuzzing`: Definitely `true`. This patch touches `drivers/infiniband/ulp/srp/ib_srp.c`, specifically `srp_recv_done` and `srp_cm_rep_handler`. This is key, since `ib_srp` is the initiator driver that handles incoming protocol packets and completions over RDMA. The changes relate to DMA sync lengths and a new validation check, which could expose errors related to memory/DMA. Because it operates over RDMA layers and changes how it processes packets, this is a prime candidate for fuzzing. * `FocusSymbols`: I need to specify the functions of interest. So, I have `srp_recv_done`, `srp_cm_rep_handler`, `srp_ib_cm_handler`, and `srp_rdma_cm_handler`. These seem like the right entry points to explore. * `EnableConfigs`: I need to enable the core configurations: `INFINIBAND_SRP`, obviously, and then also its dependencies: `INFINIBAND`, `INFINIBAND_ADDR_TRANS`, and `SCSI`. Everything lines up perfectly. I've got a solid rationale, the correct symbols, and the necessary configs. Time to call `set-results`. |
| 50/2 | 2026/11/02 10:51 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"INFINIBAND_SRP",
"INFINIBAND",
"INFINIBAND_ADDR_TRANS",
"SCSI"
],
"FocusSymbols": [
"srp_recv_done",
"srp_cm_rep_handler",
"srp_ib_cm_handler",
"srp_rdma_cm_handler"
],
"Reasoning": "The patch modifies the SCSI RDMA Protocol (SRP) initiator driver (drivers/infiniband/ulp/srp/ib_srp.c). Specifically, it updates DMA buffer sync sizes in srp_recv_done() and adds validation logic in srp_cm_rep_handler() to check that target-reported max_ti_iu_len is large enough for a struct srp_rsp. SRP is reachable in virtualized environments via software RDMA transports (e.g. rdma_rxe, siw) over standard network devices and sysfs configuration. Therefore, this represents reachable protocol handling and validation logic that warrants fuzzing.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"INFINIBAND_SRP",
"INFINIBAND",
"INFINIBAND_ADDR_TRANS",
"SCSI"
],
"FocusSymbols": [
"srp_recv_done",
"srp_cm_rep_handler",
"srp_ib_cm_handler",
"srp_rdma_cm_handler"
],
"Reasoning": "The patch modifies the SCSI RDMA Protocol (SRP) initiator driver (drivers/infiniband/ulp/srp/ib_srp.c). Specifically, it updates DMA buffer sync sizes in srp_recv_done() and adds validation logic in srp_cm_rep_handler() to check that target-reported max_ti_iu_len is large enough for a struct srp_rsp. SRP is reachable in virtualized environments via software RDMA transports (e.g. rdma_rxe, siw) over standard network devices and sysfs configuration. Therefore, this represents reachable protocol handling and validation logic that warrants fuzzing.",
"WorthFuzzing": true
} |
| 51/1 | 2026/11/02 10:51 | action | If |
1mArgs:{
"WorthFuzzing": true
}Results: null |
| 52/2 | 2026/11/02 10:51 | agent | kmsan-evaluator |
1mModel:core Args: null Results: {
"KMSANReasoning": "The patch addresses a potential out-of-bounds access and DMA sync length mismatch in the InfiniBand SRP driver:\n1. In `srp_cm_rep_handler`, it adds a bounds check ensuring that `ch-\u003emax_ti_iu_len` is at least `sizeof(struct srp_rsp)`, preventing subsequent out-of-bounds access when processing response headers in `iu-\u003ebuf`. Out-of-bounds reads and writes are detected by KASAN.\n2. In `srp_recv_done`, it updates the DMA sync length to use `iu-\u003esize` instead of `ch-\u003emax_ti_iu_len`. The underlying buffer is allocated with `kzalloc()`, and DMA sync operations deal with cache coherency rather than uninitialized memory tracking.\n\nThe changes do not touch any kernel-to-user copy interfaces, do not introduce uninitialized stack or heap variables, and do not introduce control flow dependent on uninitialized data. Therefore, standard KASAN and DMA debugging are appropriate, and 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 32ec8b0a0d47355606a8a93ea4e70d6e6a526de9
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Nov 2 10:47:59 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 5811f02df98053..159d6b6aa93e3a 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -2111,7 +2111,7 @@ static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
return;
}
- ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
+ ib_dma_sync_single_for_cpu(dev, iu->dma, iu->size,
DMA_FROM_DEVICE);
opcode = *(u8 *) iu->buf;
@@ -2148,7 +2148,7 @@ static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
break;
}
- ib_dma_sync_single_for_device(dev, iu->dma, ch->max_ti_iu_len,
+ ib_dma_sync_single_for_device(dev, iu->dma, iu->size,
DMA_FROM_DEVICE);
res = srp_post_recv(ch, iu);
@@ -2379,6 +2379,13 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
if (lrsp->opcode == SRP_LOGIN_RSP) {
ch->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
+ if (ch->max_ti_iu_len < sizeof(struct srp_rsp)) {
+ shost_printk(KERN_ERR, target->scsi_host, PFX
+ "Target reported max_ti_iu_len %u, too small for a %zu byte SRP_RSP\n",
+ ch->max_ti_iu_len, sizeof(struct srp_rsp));
+ ret = -ECONNRESET;
+ goto error;
+ }
ch->req_lim = be32_to_cpu(lrsp->req_lim_delta);
ch->use_imm_data = srp_use_imm_data &&
(lrsp->rsp_flags & SRP_LOGIN_RSP_IMMED_SUPP);
|
| 53/3 | 2026/11/02 10:51 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 2695 output: 47 thoughts: 490 Thoughts: **Analyzing a Patch to `ib_srp.c`** Okay, let's dive into this patch targeting `drivers/infiniband/ulp/srp/ib_srp.c`. I see two main areas of interest. First, within `srp_recv_done`, the code's making a critical adjustment to how DMA synchronization is handled. Specifically, it seems like the original code was using `ch->max_ti_iu_len` for both `ib_dma_sync_single_for_cpu` and `ib_dma_sync_single_for_device` calls, which is now being replaced with `iu->size`. This change is definitely significant because it ensures that we are synchronizing the *actual* amount of data transferred in the InfiniBand communication, not a potentially misconfigured maximum. Using the correct size avoids potential data corruption issues. I need to keep an eye out for potential DMA-related bugs. Secondly, and this is crucial, the patch includes a new sanity check in `srp_cm_rep_handler`. We're now validating `ch->max_ti_iu_len` after receiving it from the target during a login response (SRP_LOGIN_RSP). The added check ensures that `ch->max_ti_iu_len` is at least large enough to accommodate an `srp_rsp` struct. If it's *too* small, we're now correctly logging an error and gracefully handling the situation with a `-ECONNRESET` error. This is good defensive programming, preventing a likely buffer overflow or other memory corruption. This addition is important to avoid a class of bugs I've seen in the past where a misconfigured target can lead to system instability. I should probably use `read-file` or `grepper` to get a better grasp of the overall context and possible interactions within `ib_srp.c`. I'm curious to see how `max_ti_iu_len` is used elsewhere, and I should also verify the impact of the DMA changes on performance and potential race conditions. |
| 54/3 | 2026/11/02 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 2100,
"LineCount": 60
}Results: {
"Contents": "2100:\tstatic void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\n2101:\t{\n2102:\t\tstruct srp_iu *iu = container_of(wc-\u003ewr_cqe, struct srp_iu, cqe);\n2103:\t\tstruct srp_rdma_ch *ch = cq-\u003ecq_context;\n2104:\t\tstruct srp_target_port *target = ch-\u003etarget;\n2105:\t\tstruct ib_device *dev = target-\u003esrp_host-\u003esrp_dev-\u003edev;\n2106:\t\tint res;\n2107:\t\tu8 opcode;\n2108:\t\n2109:\t\tif (unlikely(wc-\u003estatus != IB_WC_SUCCESS)) {\n2110:\t\t\tsrp_handle_qp_err(cq, wc, \"RECV\");\n2111:\t\t\treturn;\n2112:\t\t}\n2113:\t\n2114:\t\tib_dma_sync_single_for_cpu(dev, iu-\u003edma, iu-\u003esize,\n2115:\t\t\t\t\t DMA_FROM_DEVICE);\n2116:\t\n2117:\t\topcode = *(u8 *) iu-\u003ebuf;\n2118:\t\n2119:\t\tif (0) {\n2120:\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n2121:\t\t\t\t PFX \"recv completion, opcode 0x%02x\\n\", opcode);\n2122:\t\t\tprint_hex_dump(KERN_ERR, \"\", DUMP_PREFIX_OFFSET, 8, 1,\n2123:\t\t\t\t iu-\u003ebuf, wc-\u003ebyte_len, true);\n2124:\t\t}\n2125:\t\n2126:\t\tswitch (opcode) {\n2127:\t\tcase SRP_RSP:\n2128:\t\t\tsrp_process_rsp(ch, iu-\u003ebuf, wc-\u003ebyte_len);\n2129:\t\t\tbreak;\n2130:\t\n2131:\t\tcase SRP_CRED_REQ:\n2132:\t\t\tsrp_process_cred_req(ch, iu-\u003ebuf, wc-\u003ebyte_len);\n2133:\t\t\tbreak;\n2134:\t\n2135:\t\tcase SRP_AER_REQ:\n2136:\t\t\tsrp_process_aer_req(ch, iu-\u003ebuf, wc-\u003ebyte_len);\n2137:\t\t\tbreak;\n2138:\t\n2139:\t\tcase SRP_T_LOGOUT:\n2140:\t\t\t/* XXX Handle target logout */\n2141:\t\t\tshost_printk(KERN_WARNING, target-\u003escsi_host,\n2142:\t\t\t\t PFX \"Got target logout request\\n\");\n2143:\t\t\tbreak;\n2144:\t\n2145:\t\tdefault:\n2146:\t\t\tshost_printk(KERN_WARNING, target-\u003escsi_host,\n2147:\t\t\t\t PFX \"Unhandled SRP opcode 0x%02x\\n\", opcode);\n2148:\t\t\tbreak;\n2149:\t\t}\n2150:\t\n2151:\t\tib_dma_sync_single_for_device(dev, iu-\u003edma, iu-\u003esize,\n2152:\t\t\t\t\t DMA_FROM_DEVICE);\n2153:\t\n2154:\t\tres = srp_post_recv(ch, iu);\n2155:\t\tif (res != 0)\n2156:\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n2157:\t\t\t\t PFX \"Recv failed with error code %d\\n\", res);\n2158:\t}\n2159:\t\n"
} |
| 55/3 | 2026/11/02 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4639 output: 46 thoughts: 44 Thoughts: Okay, let's dive into this. Here's how I'd approach understanding the memory allocation of `iu` and its size: **Investigating `iu` Allocation and Size** My first instinct is to confirm exactly how `iu` is being allocated and understand what the `iu->size` field represents. I need to know where this memory comes from. My goal is to determine the context of this pointer. To start, I'll focus my search within `ib_srp.c` – that's where I'd expect to find the allocation function. I'll search for either `srp_alloc_iu` or a function with a similar naming convention, one that likely handles the memory setup. I want to see how `iu` is initialized, if it's a static allocation, dynamic allocation, how its memory is managed. Understanding how `iu` gets allocated and the intent of the `size` field is crucial for any deeper analysis. I'll make sure to note if it involves a device context or memory region. |
| 56/3 | 2026/11/02 10:52 | tool | grepper |
0mArgs:{
"Expression": "alloc.*iu|iu-\u003esize",
"PathPrefixes": [
"drivers/infiniband/ulp/srp/ib_srp.c"
]
}Results: {
"Output": "drivers/infiniband/ulp/srp/ib_srp.c=213=static int srp_target_is_topspin(struct srp_target_port *target)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-222-\ndrivers/infiniband/ulp/srp/ib_srp.c:223:static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,\ndrivers/infiniband/ulp/srp/ib_srp.c-224-\t\t\t\t gfp_t gfp_mask,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-228-\ndrivers/infiniband/ulp/srp/ib_srp.c:229:\tiu = kmalloc_obj(*iu, gfp_mask);\ndrivers/infiniband/ulp/srp/ib_srp.c-230-\tif (!iu)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-241-\ndrivers/infiniband/ulp/srp/ib_srp.c:242:\tiu-\u003esize = size;\ndrivers/infiniband/ulp/srp/ib_srp.c-243-\tiu-\u003edirection = direction;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=255=static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-259-\ndrivers/infiniband/ulp/srp/ib_srp.c:260:\tib_dma_unmap_single(host-\u003esrp_dev-\u003edev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-261-\t\t\t iu-\u003edirection);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=525=static int srp_create_ch_ib(struct srp_rdma_ch *ch)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-634-/*\ndrivers/infiniband/ulp/srp/ib_srp.c:635: * Note: this function may be called without srp_alloc_iu_bufs() having been\ndrivers/infiniband/ulp/srp/ib_srp.c-636- * invoked. Hence the ch-\u003e[rt]x_ring checks.\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=1921=static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-1927-\tlist.addr = iu-\u003edma;\ndrivers/infiniband/ulp/srp/ib_srp.c:1928:\tlist.length = iu-\u003esize;\ndrivers/infiniband/ulp/srp/ib_srp.c-1929-\tlist.lkey = target-\u003elkey;\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2100=static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2113-\ndrivers/infiniband/ulp/srp/ib_srp.c:2114:\tib_dma_sync_single_for_cpu(dev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-2115-\t\t\t\t DMA_FROM_DEVICE);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2150-\ndrivers/infiniband/ulp/srp/ib_srp.c:2151:\tib_dma_sync_single_for_device(dev, iu-\u003edma, iu-\u003esize,\ndrivers/infiniband/ulp/srp/ib_srp.c-2152-\t\t\t\t DMA_FROM_DEVICE);\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2192=static enum scsi_qc_status srp_queuecommand(struct Scsi_Host *shost,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2294- */\ndrivers/infiniband/ulp/srp/ib_srp.c:2295:static int srp_alloc_iu_bufs(struct srp_rdma_ch *ch)\ndrivers/infiniband/ulp/srp/ib_srp.c-2296-{\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2307-\tfor (i = 0; i \u003c target-\u003equeue_size; ++i) {\ndrivers/infiniband/ulp/srp/ib_srp.c:2308:\t\tch-\u003erx_ring[i] = srp_alloc_iu(target-\u003esrp_host,\ndrivers/infiniband/ulp/srp/ib_srp.c-2309-\t\t\t\t\t ch-\u003emax_ti_iu_len,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2315-\tfor (i = 0; i \u003c target-\u003equeue_size; ++i) {\ndrivers/infiniband/ulp/srp/ib_srp.c:2316:\t\tch-\u003etx_ring[i] = srp_alloc_iu(target-\u003esrp_host,\ndrivers/infiniband/ulp/srp/ib_srp.c-2317-\t\t\t\t\t ch-\u003emax_it_iu_len,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c=2370=static void srp_cm_rep_handler(struct ib_cm_id *cm_id,\n--\ndrivers/infiniband/ulp/srp/ib_srp.c-2419-\tif (!ch-\u003erx_ring) {\ndrivers/infiniband/ulp/srp/ib_srp.c:2420:\t\tret = srp_alloc_iu_bufs(ch);\ndrivers/infiniband/ulp/srp/ib_srp.c-2421-\t\tif (ret)\n"
} |
| 57/3 | 2026/11/02 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 6627 output: 47 thoughts: 47 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, and delivered as a first-person summary: **Digging into the SRP Code: Context is Key** Alright, I need to understand what's going on with this issue/patch. My initial thought is to dive straight into the kernel's history. First, I'm thinking, "Where does this change actually sit within the broader context of the SRP driver?" I'll start by checking the relevant commit(s). Looking at the `git log`, focusing on the vicinity of `srp_alloc_iu` and `srp_cm_rep_handler`, are essential entry points. I know these functions are critical parts of the SRP communication, so they'll likely give me a good picture. I need to see what surrounding commits might have introduced this problem or interact with it. I'm after the surrounding context to understand the intention of these specific functions and any potential interactions that might be at play here. Ultimately, the goal is to pinpoint the specific area of code responsible. |
| 58/3 | 2026/11/02 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 2370,
"LineCount": 60
}Results: {
"Contents": "2370:\tstatic void srp_cm_rep_handler(struct ib_cm_id *cm_id,\n2371:\t\t\t\t const struct srp_login_rsp *lrsp,\n2372:\t\t\t\t struct srp_rdma_ch *ch)\n2373:\t{\n2374:\t\tstruct srp_target_port *target = ch-\u003etarget;\n2375:\t\tstruct ib_qp_attr *qp_attr = NULL;\n2376:\t\tint attr_mask = 0;\n2377:\t\tint ret = 0;\n2378:\t\tint i;\n2379:\t\n2380:\t\tif (lrsp-\u003eopcode == SRP_LOGIN_RSP) {\n2381:\t\t\tch-\u003emax_ti_iu_len = be32_to_cpu(lrsp-\u003emax_ti_iu_len);\n2382:\t\t\tif (ch-\u003emax_ti_iu_len \u003c sizeof(struct srp_rsp)) {\n2383:\t\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host, PFX\n2384:\t\t\t\t\t \"Target reported max_ti_iu_len %u, too small for a %zu byte SRP_RSP\\n\",\n2385:\t\t\t\t\t ch-\u003emax_ti_iu_len, sizeof(struct srp_rsp));\n2386:\t\t\t\tret = -ECONNRESET;\n2387:\t\t\t\tgoto error;\n2388:\t\t\t}\n2389:\t\t\tch-\u003ereq_lim = be32_to_cpu(lrsp-\u003ereq_lim_delta);\n2390:\t\t\tch-\u003euse_imm_data = srp_use_imm_data \u0026\u0026\n2391:\t\t\t\t(lrsp-\u003ersp_flags \u0026 SRP_LOGIN_RSP_IMMED_SUPP);\n2392:\t\t\tch-\u003emax_it_iu_len = srp_max_it_iu_len(target-\u003ecmd_sg_cnt,\n2393:\t\t\t\t\t\t\t ch-\u003euse_imm_data,\n2394:\t\t\t\t\t\t\t target-\u003emax_it_iu_size);\n2395:\t\t\tWARN_ON_ONCE(ch-\u003emax_it_iu_len \u003e\n2396:\t\t\t\t be32_to_cpu(lrsp-\u003emax_it_iu_len));\n2397:\t\n2398:\t\t\tif (ch-\u003euse_imm_data)\n2399:\t\t\t\tshost_printk(KERN_DEBUG, target-\u003escsi_host,\n2400:\t\t\t\t\t PFX \"using immediate data\\n\");\n2401:\t\n2402:\t\t\t/*\n2403:\t\t\t * Reserve credits for task management so we don't\n2404:\t\t\t * bounce requests back to the SCSI mid-layer.\n2405:\t\t\t */\n2406:\t\t\ttarget-\u003escsi_host-\u003ecan_queue\n2407:\t\t\t\t= min(ch-\u003ereq_lim - SRP_TSK_MGMT_SQ_SIZE,\n2408:\t\t\t\t target-\u003escsi_host-\u003ecan_queue);\n2409:\t\t\ttarget-\u003escsi_host-\u003ecmd_per_lun\n2410:\t\t\t\t= min_t(int, target-\u003escsi_host-\u003ecan_queue,\n2411:\t\t\t\t\ttarget-\u003escsi_host-\u003ecmd_per_lun);\n2412:\t\t} else {\n2413:\t\t\tshost_printk(KERN_WARNING, target-\u003escsi_host,\n2414:\t\t\t\t PFX \"Unhandled RSP opcode %#x\\n\", lrsp-\u003eopcode);\n2415:\t\t\tret = -ECONNRESET;\n2416:\t\t\tgoto error;\n2417:\t\t}\n2418:\t\n2419:\t\tif (!ch-\u003erx_ring) {\n2420:\t\t\tret = srp_alloc_iu_bufs(ch);\n2421:\t\t\tif (ret)\n2422:\t\t\t\tgoto error;\n2423:\t\t}\n2424:\t\n2425:\t\tfor (i = 0; i \u003c target-\u003equeue_size; i++) {\n2426:\t\t\tstruct srp_iu *iu = ch-\u003erx_ring[i];\n2427:\t\n2428:\t\t\tret = srp_post_recv(ch, iu);\n2429:\t\t\tif (ret)\n"
} |
| 59/3 | 2026/11/02 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8032 output: 47 thoughts: 317 Thoughts: **Analyzing Potential DMA Buffer Size Mismatches in SRP Reconnections**
Okay, let's think this through. I need to consider what happens if the receive ring, `ch->rx_ring`, is already allocated. This scenario could arise during a reconnect, multiple channel configurations, or a reconnection where the existing `ch->rx_ring` is reused. I'm focusing on the allocation of the inbound buffers. I see that on line 2419, there's a conditional: `if (!ch->rx_ring) { ret = srp_alloc_iu_bufs(ch); ... }`. That's where the initial buffer allocation occurs via `srp_alloc_iu_bufs(ch)`.
The crucial point here is that during the buffer allocation, the `iu` buffers are created using `ch->max_ti_iu_len`. Now, consider a reconnection scenario. The `lrsp->max_ti_iu_len` value *could* change during that reconnection process. And, if that happens, `ch->max_ti_iu_len` is updated with this new value. The problem is that the buffers within `ch->rx_ring` would have been allocated using the *old* value of `ch->max_ti_iu_len`. This immediately raises a red flag.
The implication is that in `srp_recv_done`, we'd perform `ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len, ...)` to sync the buffer. But, the buffer `iu->size` is the *old* length. Therefore, we're at risk of syncing more data than the allocated buffer size. This could lead to out-of-bounds DMA syncs, or at a minimum, syncing the wrong length.
That's not the only concern. If `lrsp->max_ti_iu_len` becomes smaller than the size of the SRP response header (`sizeof(struct srp_rsp)`), `srp_process_rsp` would have an issue, as it's expecting at least that many bytes to be present. I'll need to examine `srp_process_rsp` to confirm that assumption. I want to see how that function handles potentially smaller receive buffers.
|
| 60/3 | 2026/11/02 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 1980,
"LineCount": 60
}Results: {
"Contents": "1980:\t\t\t}\n1981:\t\t\tscmnd-\u003eresult = rsp-\u003estatus;\n1982:\t\n1983:\t\t\tif (rsp-\u003eflags \u0026 SRP_RSP_FLAG_SNSVALID) {\n1984:\t\t\t\tu32 resp_len = be32_to_cpu(rsp-\u003eresp_data_len);\n1985:\t\t\t\tu32 sense_len = be32_to_cpu(rsp-\u003esense_data_len);\n1986:\t\n1987:\t\t\t\t/*\n1988:\t\t\t\t * The sense data starts resp_data_len bytes past the\n1989:\t\t\t\t * response data area; both lengths come from the\n1990:\t\t\t\t * target-controlled response. Copy the sense data\n1991:\t\t\t\t * only if it has not been truncated, that is, only if\n1992:\t\t\t\t * the full sense region fits within the bytes actually\n1993:\t\t\t\t * received. Otherwise the copy source would run past\n1994:\t\t\t\t * the receive buffer (sized to the target-chosen\n1995:\t\t\t\t * max_ti_iu_len), reading out of bounds.\n1996:\t\t\t\t */\n1997:\t\t\t\tif (sizeof(*rsp) + (u64)resp_len + sense_len \u003c= byte_len)\n1998:\t\t\t\t\tmemcpy(scmnd-\u003esense_buffer,\n1999:\t\t\t\t\t rsp-\u003edata + resp_len,\n2000:\t\t\t\t\t min(sense_len, SCSI_SENSE_BUFFERSIZE));\n2001:\t\t\t\telse\n2002:\t\t\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n2003:\t\t\t\t\t\t \"dropping truncated sense data (resp_data_len %u sense_data_len %u, %u bytes received)\\n\",\n2004:\t\t\t\t\t\t resp_len, sense_len, byte_len);\n2005:\t\t\t}\n2006:\t\n2007:\t\t\tif (unlikely(rsp-\u003eflags \u0026 SRP_RSP_FLAG_DIUNDER))\n2008:\t\t\t\tscsi_set_resid(scmnd, be32_to_cpu(rsp-\u003edata_in_res_cnt));\n2009:\t\t\telse if (unlikely(rsp-\u003eflags \u0026 SRP_RSP_FLAG_DOUNDER))\n2010:\t\t\t\tscsi_set_resid(scmnd, be32_to_cpu(rsp-\u003edata_out_res_cnt));\n2011:\t\n2012:\t\t\tsrp_free_req(ch, req, scmnd,\n2013:\t\t\t\t be32_to_cpu(rsp-\u003ereq_lim_delta));\n2014:\t\n2015:\t\t\tscsi_done(scmnd);\n2016:\t\t}\n2017:\t}\n2018:\t\n2019:\tstatic int srp_response_common(struct srp_rdma_ch *ch, s32 req_delta,\n2020:\t\t\t\t void *rsp, int len)\n2021:\t{\n2022:\t\tstruct srp_target_port *target = ch-\u003etarget;\n2023:\t\tstruct ib_device *dev = target-\u003esrp_host-\u003esrp_dev-\u003edev;\n2024:\t\tunsigned long flags;\n2025:\t\tstruct srp_iu *iu;\n2026:\t\tint err;\n2027:\t\n2028:\t\tspin_lock_irqsave(\u0026ch-\u003elock, flags);\n2029:\t\tch-\u003ereq_lim += req_delta;\n2030:\t\tiu = __srp_get_tx_iu(ch, SRP_IU_RSP);\n2031:\t\tspin_unlock_irqrestore(\u0026ch-\u003elock, flags);\n2032:\t\n2033:\t\tif (!iu) {\n2034:\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host, PFX\n2035:\t\t\t\t \"no IU available to send response\\n\");\n2036:\t\t\treturn 1;\n2037:\t\t}\n2038:\t\n2039:\t\tiu-\u003enum_sge = 1;\n"
} |
| 61/3 | 2026/11/02 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9942 output: 47 thoughts: 23 Thoughts: Here's a summary of my thought process: **Diving into `srp_process_rsp`** Okay, so I need to understand how `srp_process_rsp` handles the `rsp` variable. To get a handle on this, I'm going to jump back in the code and start looking at the lines before `srp_process_rsp` is called. The goal is to establish the context, trace the usage of `rsp`, and figure out how it’s being initialized and modified prior to the function's execution. Knowing how it's set up initially will be key to understanding the function's role. Essentially, I need to see what's being fed *into* this function, to understand what it's supposed to do with it. This is a crucial step for dissecting the function's internal logic later on. |
| 62/3 | 2026/11/02 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 1940,
"LineCount": 45
}Results: {
"Contents": "1940:\t\n1941:\tstatic void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp,\n1942:\t\t\t\t u32 byte_len)\n1943:\t{\n1944:\t\tstruct srp_target_port *target = ch-\u003etarget;\n1945:\t\tstruct srp_request *req;\n1946:\t\tstruct scsi_cmnd *scmnd;\n1947:\t\tunsigned long flags;\n1948:\t\n1949:\t\tif (unlikely(rsp-\u003etag \u0026 SRP_TAG_TSK_MGMT)) {\n1950:\t\t\tspin_lock_irqsave(\u0026ch-\u003elock, flags);\n1951:\t\t\tch-\u003ereq_lim += be32_to_cpu(rsp-\u003ereq_lim_delta);\n1952:\t\t\tif (rsp-\u003etag == ch-\u003etsk_mgmt_tag) {\n1953:\t\t\t\tch-\u003etsk_mgmt_status = -1;\n1954:\t\t\t\tif (be32_to_cpu(rsp-\u003eresp_data_len) \u003e= 4 \u0026\u0026\n1955:\t\t\t\t byte_len \u003e= sizeof(*rsp) + 4)\n1956:\t\t\t\t\tch-\u003etsk_mgmt_status = rsp-\u003edata[3];\n1957:\t\t\t\tcomplete(\u0026ch-\u003etsk_mgmt_done);\n1958:\t\t\t} else {\n1959:\t\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n1960:\t\t\t\t\t \"Received tsk mgmt response too late for tag %#llx\\n\",\n1961:\t\t\t\t\t rsp-\u003etag);\n1962:\t\t\t}\n1963:\t\t\tspin_unlock_irqrestore(\u0026ch-\u003elock, flags);\n1964:\t\t} else {\n1965:\t\t\tscmnd = scsi_host_find_tag(target-\u003escsi_host, rsp-\u003etag);\n1966:\t\t\tif (scmnd) {\n1967:\t\t\t\treq = scsi_cmd_priv(scmnd);\n1968:\t\t\t\tscmnd = srp_claim_req(ch, req, NULL, scmnd);\n1969:\t\t\t}\n1970:\t\t\tif (!scmnd) {\n1971:\t\t\t\tshost_printk(KERN_ERR, target-\u003escsi_host,\n1972:\t\t\t\t\t \"Null scmnd for RSP w/tag %#016llx received on ch %td / QP %#x\\n\",\n1973:\t\t\t\t\t rsp-\u003etag, ch - target-\u003ech, ch-\u003eqp-\u003eqp_num);\n1974:\t\n1975:\t\t\t\tspin_lock_irqsave(\u0026ch-\u003elock, flags);\n1976:\t\t\t\tch-\u003ereq_lim += be32_to_cpu(rsp-\u003ereq_lim_delta);\n1977:\t\t\t\tspin_unlock_irqrestore(\u0026ch-\u003elock, flags);\n1978:\t\n1979:\t\t\t\treturn;\n1980:\t\t\t}\n1981:\t\t\tscmnd-\u003eresult = rsp-\u003estatus;\n1982:\t\n1983:\t\t\tif (rsp-\u003eflags \u0026 SRP_RSP_FLAG_SNSVALID) {\n1984:\t\t\t\tu32 resp_len = be32_to_cpu(rsp-\u003eresp_data_len);\n"
} |
| 63/3 | 2026/11/02 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 11030 output: 46 thoughts: 431 Thoughts: **Analyzing a Potential Out-of-Bounds Read in SRP Processing** Okay, let's dive into this `srp_process_rsp` function. The first thing that jumps out is how `rsp` is directly cast from `iu->buf`. Now, if `ch->max_ti_iu_len` is smaller than the actual size of `struct srp_rsp`, it means `srp_alloc_iu` might have allocated a smaller buffer – say, only 10 bytes. But then, when a packet arrives, the code goes ahead and accesses fields like `rsp->tag`, `rsp->req_lim_delta`, `rsp->flags`, and so on, *way* past the allocated buffer! That's a classic out-of-bounds read, and KASAN should be detecting it. Then, I see in `srp_recv_done` that `ib_dma_sync_single_for_cpu` is using `ch->max_ti_iu_len` instead of `iu->size`. If `ch->max_ti_iu_len` were to change between reconnects, syncing using `ch->max_ti_iu_len` could sync past `iu->size` or the length of the DMA allocation. That's a significant potential DMA issue. Alright, let's pivot and check for uninitialized memory issues. Does this patch introduce or change anything that could lead to uninitialized memory being exposed? * No kernel structures are sent to user space, so no issues there. * No conditional logic depends on uninitialized variables, so that's good. * No allocations of complex data structures with uninitialized fields. * But hold on... are there any bounds checks that might expose uninitialized bytes? Wait, I need to go back and check... Does `iu->buf` come from `kzalloc` or `kmalloc`? Let's check `srp_alloc_iu`! |
| 64/3 | 2026/11/02 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/infiniband/ulp/srp/ib_srp.c",
"FirstLine": 220,
"LineCount": 40
}Results: {
"Contents": " 220:\t\t\t !memcmp(\u0026target-\u003eioc_guid, cisco_oui, sizeof cisco_oui));\n 221:\t}\n 222:\t\n 223:\tstatic struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,\n 224:\t\t\t\t\t gfp_t gfp_mask,\n 225:\t\t\t\t\t enum dma_data_direction direction)\n 226:\t{\n 227:\t\tstruct srp_iu *iu;\n 228:\t\n 229:\t\tiu = kmalloc_obj(*iu, gfp_mask);\n 230:\t\tif (!iu)\n 231:\t\t\tgoto out;\n 232:\t\n 233:\t\tiu-\u003ebuf = kzalloc(size, gfp_mask);\n 234:\t\tif (!iu-\u003ebuf)\n 235:\t\t\tgoto out_free_iu;\n 236:\t\n 237:\t\tiu-\u003edma = ib_dma_map_single(host-\u003esrp_dev-\u003edev, iu-\u003ebuf, size,\n 238:\t\t\t\t\t direction);\n 239:\t\tif (ib_dma_mapping_error(host-\u003esrp_dev-\u003edev, iu-\u003edma))\n 240:\t\t\tgoto out_free_buf;\n 241:\t\n 242:\t\tiu-\u003esize = size;\n 243:\t\tiu-\u003edirection = direction;\n 244:\t\n 245:\t\treturn iu;\n 246:\t\n 247:\tout_free_buf:\n 248:\t\tkfree(iu-\u003ebuf);\n 249:\tout_free_iu:\n 250:\t\tkfree(iu);\n 251:\tout:\n 252:\t\treturn NULL;\n 253:\t}\n 254:\t\n 255:\tstatic void srp_free_iu(struct srp_host *host, struct srp_iu *iu)\n 256:\t{\n 257:\t\tif (!iu)\n 258:\t\t\treturn;\n 259:\t\n"
} |
| 65/3 | 2026/11/02 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12490 output: 253 thoughts: 676 Thoughts: **KMSAN Assessment: No Need for KMSAN** Okay, let's break this down. First, the core of the patch involves buffer allocation with `kzalloc` for `iu->buf`, so it's zero-initialized by default. We're dealing with DMA receive operations here, pulling data from the device or InfiniBand network. The patch is about two key changes: adjusting the DMA sync size and adding a validation check. The DMA sync size change in `srp_recv_done` goes from `ch->max_ti_iu_len` to `iu->size`. Then, in `srp_cm_rep_handler`, a check is added: `ch->max_ti_iu_len < sizeof(struct srp_rsp)`. This prevents allocating buffers that are too small and avoids an out-of-bounds access within `srp_process_rsp`, specifically the dereferencing of `rsp->...`. Now, the main concern regarding KMSAN is uninitialized memory. KMSAN is for catching those sneaky uninitialized memory risks. But, these changes are addressing potential out-of-bounds reads and writes, standard memory safety bugs that KASAN already detects. It's about DMA sync bounds, which relate to buffer length and DMA API, not uninitialized memory. Nothing here is reading uninitialized memory, leaking it to userspace, or using it in any conditional branches. There's no involvement with any user-copy functions either. This patch is all about fixing OOB accesses and protocol validation problems. Looking at the KMSAN guidelines, this is a clear `NeedsKMSAN=false` situation. * No introduction or exposure of uninitialized memory. * Zeroing is prevalent, with `kzalloc` providing it, and the check. * The code addresses OOB access and DMA sync issues, which are already caught by KASAN. I've double-checked: `ib_dma_sync_single_for_cpu` and `ib_dma_sync_single_for_device` are now using `iu->size`, and the new check, `ch->max_ti_iu_len < sizeof(struct srp_rsp)` doesn't reveal or introduce any uninitialized memory read or info-leak risk. Any bugs fixed or addressed here are related to out-of-bounds access or incorrect DMA sync lengths, which KASAN and DMA-debug already detect. Therefore, we're good to go with the `KMSANReasoning` and `set-results`. |
| 66/3 | 2026/11/02 10:53 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch addresses a potential out-of-bounds access and DMA sync length mismatch in the InfiniBand SRP driver:\n1. In `srp_cm_rep_handler`, it adds a bounds check ensuring that `ch-\u003emax_ti_iu_len` is at least `sizeof(struct srp_rsp)`, preventing subsequent out-of-bounds access when processing response headers in `iu-\u003ebuf`. Out-of-bounds reads and writes are detected by KASAN.\n2. In `srp_recv_done`, it updates the DMA sync length to use `iu-\u003esize` instead of `ch-\u003emax_ti_iu_len`. The underlying buffer is allocated with `kzalloc()`, and DMA sync operations deal with cache coherency rather than uninitialized memory tracking.\n\nThe changes do not touch any kernel-to-user copy interfaces, do not introduce uninitialized stack or heap variables, and do not introduce control flow dependent on uninitialized data. Therefore, standard KASAN and DMA debugging are appropriate, and a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch addresses a potential out-of-bounds access and DMA sync length mismatch in the InfiniBand SRP driver:\n1. In `srp_cm_rep_handler`, it adds a bounds check ensuring that `ch-\u003emax_ti_iu_len` is at least `sizeof(struct srp_rsp)`, preventing subsequent out-of-bounds access when processing response headers in `iu-\u003ebuf`. Out-of-bounds reads and writes are detected by KASAN.\n2. In `srp_recv_done`, it updates the DMA sync length to use `iu-\u003esize` instead of `ch-\u003emax_ti_iu_len`. The underlying buffer is allocated with `kzalloc()`, and DMA sync operations deal with cache coherency rather than uninitialized memory tracking.\n\nThe changes do not touch any kernel-to-user copy interfaces, do not introduce uninitialized stack or heap variables, and do not introduce control flow dependent on uninitialized data. Therefore, standard KASAN and DMA debugging are appropriate, and a dedicated KMSAN fuzzing session is not warranted.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
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| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
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