AI Trajectory

null

{
  "EnableConfigs": [
    "IP_SCTP"
  ],
  "FocusSymbols": [
    "sctp_send_reset_streams",
    "sctp_process_strreset_inreq"
  ],
  "Reasoning": "The patch modifies SCTP stream reset logic, fixing a length calculation in sctp_send_reset_streams and adding a length check in sctp_process_strreset_inreq. This is a functional change in the SCTP protocol implementation and should be fuzzed.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit ba7391daf500b0fa342f2091e37a73ee1cf86c11\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Fri Jul 10 21:44:02 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/sctp/stream.c b/net/sctp/stream.c\nindex 5c2fdedea088ff..34ffe6c945a4bb 100644\n--- a/net/sctp/stream.c\n+++ b/net/sctp/stream.c\n@@ -308,7 +308,8 @@ int sctp_send_reset_streams(struct sctp_association *asoc,\n \t\t\t\t\tgoto out;\n \n \t\t\tparam_len += str_nums * sizeof(__u16) +\n-\t\t\t\t     sizeof(struct sctp_strreset_inreq);\n+\t\t\t\t     (out ? sizeof(struct sctp_strreset_inreq)\n+\t\t\t\t\t  : sizeof(struct sctp_strreset_outreq));\n \t\t}\n \n \t\tif (param_len \u003e SCTP_MAX_CHUNK_LEN -\n@@ -639,6 +640,9 @@ struct sctp_chunk *sctp_process_strreset_inreq(\n \n \tnums = (ntohs(param.p-\u003elength) - sizeof(*inreq)) / sizeof(__u16);\n \tstr_p = inreq-\u003elist_of_streams;\n+\tif (nums * sizeof(__u16) + sizeof(struct sctp_strreset_outreq) \u003e\n+\t    SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_reconf_chunk))\n+\t\tgoto out;\n \tfor (i = 0; i \u003c nums; i++) {\n \t\tif (ntohs(str_p[i]) \u003e= stream-\u003eoutcnt) {\n \t\t\tresult = SCTP_STRRESET_ERR_WRONG_SSN;\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": [
    "IP_SCTP"
  ],
  "FocusSymbols": [
    "sctp_send_reset_streams",
    "sctp_process_strreset_inreq"
  ],
  "Reasoning": "The patch modifies SCTP stream reset logic, fixing a length calculation in sctp_send_reset_streams and adding a length check in sctp_process_strreset_inreq. This is a functional change in the SCTP protocol implementation and should be fuzzed.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit ba7391daf500b0fa342f2091e37a73ee1cf86c11
Author: syz-cluster <triage@syzkaller.com>
Date:   Fri Jul 10 21:44:02 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index 5c2fdedea088ff..34ffe6c945a4bb 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -308,7 +308,8 @@ int sctp_send_reset_streams(struct sctp_association *asoc,
 					goto out;
 
 			param_len += str_nums * sizeof(__u16) +
-				     sizeof(struct sctp_strreset_inreq);
+				     (out ? sizeof(struct sctp_strreset_inreq)
+					  : sizeof(struct sctp_strreset_outreq));
 		}
 
 		if (param_len > SCTP_MAX_CHUNK_LEN -
@@ -639,6 +640,9 @@ struct sctp_chunk *sctp_process_strreset_inreq(
 
 	nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16);
 	str_p = inreq->list_of_streams;
+	if (nums * sizeof(__u16) + sizeof(struct sctp_strreset_outreq) >
+	    SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_reconf_chunk))
+		goto out;
 	for (i = 0; i < nums; i++) {
 		if (ntohs(str_p[i]) >= stream->outcnt) {
 			result = SCTP_STRRESET_ERR_WRONG_SSN;

gemini-3.1-pro-preview

null

null

							input: 2045
							output: 34
							thoughts: 195
						

**SCTP Stream Reset Patch Analysis**

Okay, so I've got a patch here in `net/sctp/stream.c` that seems to be touching the stream reset logic. Specifically, it's modifying `sctp_send_reset_streams` and `sctp_process_strreset_inreq`. From a quick glance, it looks like it's addressing a possible calculation error related to `param_len` in the sending function and adding a length validation to the incoming request processing. That's a definite functional change, right in the heart of SCTP stream management. Given that, I'm thinking this screams "fuzz me!" – we need to subject this to rigorous testing to make sure it's robust.

Now, let me just double-check the relevant configuration option. I'll open up `net/sctp/stream.c` quickly...Yep, `CONFIG_IP_SCTP` is the key. Got it. Always good to confirm these things.

And let's quickly jot down the two functions we're looking at again: `sctp_send_reset_streams` and `sctp_process_strreset_inreq`. Good to have those handy for reference.
Okay, now I want to confirm the SCTP config.

{
  "Expression": "config IP_SCTP",
  "PathPrefix": "net/sctp/Kconfig"
}

{
  "Output": "net/sctp/Kconfig-5-\nnet/sctp/Kconfig:6:menuconfig IP_SCTP\nnet/sctp/Kconfig-7-\ttristate \"The SCTP Protocol\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 2621
							output: 38
							thoughts: 48
						

Okay, here's my take on those thoughts, tailored for an expert audience:

**Analyzing SCTP Stream Reset Configurations**

Right, so we're dealing with `IP_SCTP`—got it. Let's dig into the details surrounding stream resets. My immediate focus is on the functions `sctp_send_reset_streams` and `sctp_process_strreset_inreq`. These are the key players in handling stream reset requests and responses within SCTP. I'm especially keen to see if there are any other configuration points that might influence how these functions behave, such as parameters controlling how aggressively stream resets are initiated, or how they are processed. Knowing those details can give a clearer understanding of the design philosophy.

{
  "Expression": "sctp_send_reset_streams",
  "PathPrefix": "net/sctp/stream.c"
}

{
  "Output": "net/sctp/stream.c=241=static bool sctp_stream_outq_is_empty(struct sctp_stream *stream,\n--\nnet/sctp/stream.c-264-\nnet/sctp/stream.c:265:int sctp_send_reset_streams(struct sctp_association *asoc,\nnet/sctp/stream.c-266-\t\t\t    struct sctp_reset_streams *params)\n"
}

gemini-3.1-pro-preview

null

null

							input: 2997
							output: 40
							thoughts: 17
						

Okay, let's dive into this. Here's my thought process on examining `sctp_process_strreset_inreq`:

**Analyzing `sctp_process_strreset_inreq`**

Alright, the first thing I'm doing is zeroing in on `sctp_process_strreset_inreq`. This function name immediately screams Stream Reset Request (STRRESET) handling within the SCTP protocol, so I'm already anticipating dealing with a rather specific and critical part of connection management. I need to understand exactly what happens here when a peer initiates a stream reset. What state transitions are involved? What data structures are manipulated? What potential error conditions need to be handled? I'll probably be tracing execution paths and looking at variable definitions to get a clear picture. I'll need to know: what are the implications on other streams, how does it interact with the transmission queue, and does this part have any security implications that I should keep in mind. I need to be thorough and precise.

{
  "Expression": "sctp_process_strreset_inreq",
  "PathPrefix": "net/sctp/stream.c"
}

{
  "Output": "net/sctp/stream.c=517=struct sctp_chunk *sctp_process_strreset_outreq(\n--\nnet/sctp/stream.c-605-\nnet/sctp/stream.c:606:struct sctp_chunk *sctp_process_strreset_inreq(\nnet/sctp/stream.c-607-\t\t\t\tstruct sctp_association *asoc,\n"
}

gemini-3.1-pro-preview

null

null

							input: 3393
							output: 122
							thoughts: 48
						

Okay, here's my interpretation of these functions and their context, as if they were my own thoughts:

**Analyzing SCTP Stream Reset Functionality**

Alright, I'm looking at two SCTP-related functions: `sctp_send_reset_streams` and `sctp_process_strreset_inreq`. The key here is the "stream reset" functionality. That's a critical part of SCTP, allowing for targeted stream disruption and recovery within an association. The presence of `sctp_process_strreset_inreq` suggests we're dealing with the reception and handling of stream reset requests from a peer. `sctp_send_reset_streams` is, logically, the counterpart that initiates such a request.

My initial thought is to relate this to the current IP configuration. The mention of `IP_SCTP` confirms we're in the realm of SCTP over IP, which seems straightforward enough.

Now, where do these functions fit into the larger scheme? How are they interacting with state machines or other control processes within the SCTP stack? Are these calls triggered by user-level requests, or are they internally initiated based on some detection of a problem in specific streams?

I think I will use set-results, this will help give context to my thoughts on the matter.

{
  "EnableConfigs": [
    "IP_SCTP"
  ],
  "FocusSymbols": [
    "sctp_send_reset_streams",
    "sctp_process_strreset_inreq"
  ],
  "Reasoning": "The patch modifies SCTP stream reset logic, fixing a length calculation in sctp_send_reset_streams and adding a length check in sctp_process_strreset_inreq. This is a functional change in the SCTP protocol implementation and should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "IP_SCTP"
  ],
  "FocusSymbols": [
    "sctp_send_reset_streams",
    "sctp_process_strreset_inreq"
  ],
  "Reasoning": "The patch modifies SCTP stream reset logic, fixing a length calculation in sctp_send_reset_streams and adding a length check in sctp_process_strreset_inreq. This is a functional change in the SCTP protocol implementation and should be fuzzed.",
  "WorthFuzzing": true
}