| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/18 19:07 | flow | patch-triage |
0mArgs:null Results: {
"EnableConfigs": [
"TIPC"
],
"FocusSymbols": [
"tipc_link_rcv",
"tipc_rcv"
],
"KMSANReasoning": "The patch addresses a potential memory exhaustion (DoS) vulnerability in the TIPC subsystem where a peer could stream incomplete fragment chains to unboundedly grow kernel memory. The fix introduces a size limit check (`truesize \u003e 2 * MAX_MSG_SIZE`) for incomplete reassembled messages and frees the skb if the limit is exceeded. This change does not introduce any new data structures, allocations, or user-space copies that could expose uninitialized memory. The bug being fixed is related to resource management and memory leaks, which are not in the scope of KMSAN (KernelMemorySanitizer). Standard fuzzing with KASAN and kmemleak is sufficient for detecting memory corruption or leak issues in this context.",
"NeedsKMSAN": false,
"Reasoning": "The patch introduces a functional change in the TIPC fragment reassembly logic to prevent unbounded memory growth. It adds a check to drop incomplete fragment chains if their size exceeds `2 * MAX_MSG_SIZE`. This code is reachable via normal TIPC packet processing paths, specifically through `tipc_rcv` and `tipc_link_rcv`.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/18 19:07 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit d1479caab492d1ab8a235688ef318669bd51aec9\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Aug 18 19:07:07 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/net/tipc/link.c b/net/tipc/link.c\nindex 49dfc098d89b2..bf61c9ac4ea21 100644\n--- a/net/tipc/link.c\n+++ b/net/tipc/link.c\n@@ -1315,7 +1315,22 @@ static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,\n \t\tif (tipc_buf_append(reasm_skb, \u0026skb)) {\n \t\t\tl-\u003estats.recv_fragmented++;\n \t\t\ttipc_data_input(l, skb, inputq);\n-\t\t} else if (!*reasm_skb \u0026\u0026 !link_is_bc_rcvlink(l)) {\n+\t\t} else if (*reasm_skb) {\n+\t\t\t/* A legitimate reassembled message can never exceed\n+\t\t\t * MAX_MSG_SIZE. Limit the memory one incomplete\n+\t\t\t * fragment chain can pin, otherwise a peer can grow\n+\t\t\t * kernel memory unboundedly by streaming fragment\n+\t\t\t * chains that never complete: received traffic also\n+\t\t\t * resets the link silence counter, so the link never\n+\t\t\t * times out and the chains are never freed.\n+\t\t\t */\n+\t\t\tif ((*reasm_skb)-\u003etruesize \u003e 2 * MAX_MSG_SIZE) {\n+\t\t\t\tpr_warn_ratelimited(\"Fragment chain larger than %u bytes, dropping\\n\",\n+\t\t\t\t\t\t 2 * MAX_MSG_SIZE);\n+\t\t\t\tkfree_skb(*reasm_skb);\n+\t\t\t\t*reasm_skb = NULL;\n+\t\t\t}\n+\t\t} else if (!link_is_bc_rcvlink(l)) {\n \t\t\tpr_warn_ratelimited(\"Unable to build fragment list\\n\");\n \t\t\treturn tipc_link_fsm_evt(l, LINK_FAILURE_EVT);\n \t\t}\n"
} |
| 2/1 | 2026/08/18 19:07 | agent | patch-evaluator |
0mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"TIPC"
],
"FocusSymbols": [
"tipc_link_rcv",
"tipc_rcv"
],
"Reasoning": "The patch introduces a functional change in the TIPC fragment reassembly logic to prevent unbounded memory growth. It adds a check to drop incomplete fragment chains if their size exceeds `2 * MAX_MSG_SIZE`. This code is reachable via normal TIPC packet processing paths, specifically through `tipc_rcv` and `tipc_link_rcv`.",
"WorthFuzzing": true
}Instruction: 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). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. 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. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 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. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. 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. Prompt: For your convenience, here is the diff of the changes:
commit d1479caab492d1ab8a235688ef318669bd51aec9
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Aug 18 19:07:07 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 49dfc098d89b2..bf61c9ac4ea21 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1315,7 +1315,22 @@ static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
if (tipc_buf_append(reasm_skb, &skb)) {
l->stats.recv_fragmented++;
tipc_data_input(l, skb, inputq);
- } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
+ } else if (*reasm_skb) {
+ /* A legitimate reassembled message can never exceed
+ * MAX_MSG_SIZE. Limit the memory one incomplete
+ * fragment chain can pin, otherwise a peer can grow
+ * kernel memory unboundedly by streaming fragment
+ * chains that never complete: received traffic also
+ * resets the link silence counter, so the link never
+ * times out and the chains are never freed.
+ */
+ if ((*reasm_skb)->truesize > 2 * MAX_MSG_SIZE) {
+ pr_warn_ratelimited("Fragment chain larger than %u bytes, dropping\n",
+ 2 * MAX_MSG_SIZE);
+ kfree_skb(*reasm_skb);
+ *reasm_skb = NULL;
+ }
+ } else if (!link_is_bc_rcvlink(l)) {
pr_warn_ratelimited("Unable to build fragment list\n");
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
}
|
| 3/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2247 output: 31 thoughts: 185 Thoughts: **Analyzing the TIPC Link Input Patch** Okay, so I'm looking at this patch for `net/tipc/link.c`, specifically the `tipc_link_input` function. It seems they've added a crucial check within the fragment reassembly process. The core of it involves preventing excessive memory usage when dealing with incomplete fragment chains, which is a classic potential vulnerability. The patch's logic is pretty straightforward: it's adding an explicit check for `(*reasm_skb)->truesize > 2 * MAX_MSG_SIZE` within that `tipc_link_input` function. If the reassembled fragment chain gets too large – exceeding twice the maximum message size – it's going to drop the chain entirely, setting `*reasm_skb` to `NULL`. This is a solid, functional fix to prevent unbounded memory growth, essentially a DoS protection in the making, and it's good to see proactive measures like this. I'll quickly pull up `net/tipc/link.c` and take a look at `tipc_link_input` directly to verify the implementation. Then I'll look for `tipc_link_input` and `tipc_buf_append` to get a better sense of how those functions are called and where the patch is operating in the wider TIPC context. It's always important to fully understand the surrounding code when evaluating a change like this. The fact that `CONFIG_TIPC` is involved helps to quickly understand the wider context. |
| 4/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "tipc_link_input",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/link.c=338=unsigned long tipc_link_tolerance(struct tipc_link *l)\n--\nnet/tipc/link.c-342-\nnet/tipc/link.c:343:struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)\nnet/tipc/link.c-344-{\n--\nnet/tipc/link.c=1244=static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1290-\nnet/tipc/link.c:1291:/* tipc_link_input - process packet that has passed link protocol check\nnet/tipc/link.c-1292- *\n--\nnet/tipc/link.c-1294- */\nnet/tipc/link.c:1295:static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,\nnet/tipc/link.c-1296-\t\t\t struct sk_buff_head *inputq,\n--\nnet/tipc/link.c=1355=static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1411-\t\tif (!tipc_data_input(l, iskb, inputq))\nnet/tipc/link.c:1412:\t\t\trc |= tipc_link_input(l, iskb, inputq, reasm_skb);\nnet/tipc/link.c-1413-\t\tif (unlikely(rc))\n--\nnet/tipc/link.c=1777=int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1829-\t\telse if (!tipc_data_input(l, skb, l-\u003einputq))\nnet/tipc/link.c:1830:\t\t\trc |= tipc_link_input(l, skb, l-\u003einputq, \u0026l-\u003ereasm_buf);\nnet/tipc/link.c-1831-\t\tif (unlikely(++l-\u003ercv_unacked \u003e= TIPC_MIN_LINK_WIN))\n--\nnet/tipc/link.h=107=int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,\nnet/tipc/link.h-108-\t\t struct sk_buff_head *xmitq);\nnet/tipc/link.h:109:struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);\nnet/tipc/link.h-110-u16 tipc_link_rcv_nxt(struct tipc_link *l);\n--\nnet/tipc/node.c=1938=static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,\n--\nnet/tipc/node.c-2008-\t\t\t\t\t\t \"node link down \u003c- failover!\");\nnet/tipc/node.c:2009:\t\t\ttipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),\nnet/tipc/node.c:2010:\t\t\t\t\t\t\ttipc_link_inputq(l));\nnet/tipc/node.c-2011-\t\t}\n--\nnet/tipc/node.c-2063-\t\t}\nnet/tipc/node.c:2064:\t\tinputq_len = skb_queue_len(tipc_link_inputq(pl));\nnet/tipc/node.c-2065-\t\tdlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;\n"
} |
| 5/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3788 output: 32 thoughts: 58 Thoughts: **Analyzing the TIPC Link Input Function** Okay, so `tipc_link_input` is a static function. That immediately narrows down the scope of where I need to look for its usage. It's called from `tipc_link_tnl_rcv` and `tipc_link_rcv`, which makes sense given the function name. Now, to understand the broader implications of `tipc_link_input` and its place in the system, I need to know the calling context of `tipc_link_rcv`. Let's trace back and see where that function is actually invoked. I need to understand the control flow to grasp the potential impact of changes or issues within `tipc_link_input`. |
| 6/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "tipc_link_rcv",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/bcast.c=436=int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb)\n--\nnet/tipc/bcast.c-453-\telse\nnet/tipc/bcast.c:454:\t\trc = tipc_link_rcv(l, skb, NULL);\nnet/tipc/bcast.c-455-\ttipc_bcast_unlock(net);\n--\nnet/tipc/link.c=423=int tipc_link_mss(struct tipc_link *l)\n--\nnet/tipc/link.c-431-\nnet/tipc/link.c:432:u16 tipc_link_rcv_nxt(struct tipc_link *l)\nnet/tipc/link.c-433-{\n--\nnet/tipc/link.c=1747=static int tipc_link_build_nack_msg(struct tipc_link *l,\n--\nnet/tipc/link.c-1771-\nnet/tipc/link.c:1772:/* tipc_link_rcv - process TIPC packets/messages arriving from off-node\nnet/tipc/link.c-1773- * @l: the link that should handle the message\n--\nnet/tipc/link.c-1776- */\nnet/tipc/link.c:1777:int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,\nnet/tipc/link.c-1778-\t\t struct sk_buff_head *xmitq)\n--\nnet/tipc/link.h=109=struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);\nnet/tipc/link.h:110:u16 tipc_link_rcv_nxt(struct tipc_link *l);\nnet/tipc/link.h-111-u16 tipc_link_acked(struct tipc_link *l);\n--\nnet/tipc/link.h=131=int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);\nnet/tipc/link.h:132:int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,\nnet/tipc/link.h-133-\t\t struct sk_buff_head *xmitq);\n--\nnet/tipc/node.c=958=static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,\n--\nnet/tipc/node.c-972-\nnet/tipc/node.c:973:\tn-\u003esync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);\nnet/tipc/node.c-974-\ttipc_link_failover_prepare(l, tnl, xmitq);\n--\nnet/tipc/node.c=988=static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,\n--\nnet/tipc/node.c-1051-\ttipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);\nnet/tipc/node.c:1052:\tn-\u003esync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);\nnet/tipc/node.c-1053-\ttipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);\n--\nnet/tipc/node.c=1938=static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,\n--\nnet/tipc/node.c-1958-\t\treturn false;\nnet/tipc/node.c:1959:\trcv_nxt = tipc_link_rcv_nxt(l);\nnet/tipc/node.c-1960-\n--\nnet/tipc/node.c-2064-\t\tinputq_len = skb_queue_len(tipc_link_inputq(pl));\nnet/tipc/node.c:2065:\t\tdlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;\nnet/tipc/node.c-2066-\t\tif (more(dlv_nxt, n-\u003esync_point)) {\n--\nnet/tipc/node.c=2091=void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)\n--\nnet/tipc/node.c-2171-\t\tif (le-\u003elink) {\nnet/tipc/node.c:2172:\t\t\trc = tipc_link_rcv(le-\u003elink, skb, \u0026xmitq);\nnet/tipc/node.c-2173-\t\t\tskb = NULL;\n--\nnet/tipc/node.c-2185-\t\t\tif (le-\u003elink) {\nnet/tipc/node.c:2186:\t\t\t\trc = tipc_link_rcv(le-\u003elink, skb, \u0026xmitq);\nnet/tipc/node.c-2187-\t\t\t\tskb = NULL;\n"
} |
| 7/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5436 output: 30 thoughts: 39 Thoughts: Here's my take on the thought process, summarized as you requested: **Deconstructing the TIPC Receive Path** Alright, so `tipc_rcv` is the central function for receiving TIPC packets. If I'm going to understand the whole receive process, I need to know where this thing is actually called. Let's fire up the search tools and see where this key function is invoked within the kernel. Time to trace the execution path. |
| 8/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "tipc_rcv",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/bearer.c=657=static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,\n--\nnet/tipc/bearer.c-668-\t\tTIPC_SKB_CB(skb)-\u003eflags = 0;\nnet/tipc/bearer.c:669:\t\ttipc_rcv(dev_net(b-\u003ept.dev), skb, b);\nnet/tipc/bearer.c-670-\t\trcu_read_unlock();\n--\nnet/tipc/bearer.h=179=struct tipc_bearer_names {\n--\nnet/tipc/bearer.h-187-\nnet/tipc/bearer.h:188:void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b);\nnet/tipc/bearer.h-189-\n--\nnet/tipc/crypto.c=965=static void tipc_aead_decrypt_done(void *data, int err)\n--\nnet/tipc/crypto.c-988-\t\tif (likely(test_bit(0, \u0026b-\u003eup)))\nnet/tipc/crypto.c:989:\t\t\ttipc_rcv(net, skb, b);\nnet/tipc/crypto.c-990-\t\telse\n--\nnet/tipc/crypto.c=1689=int tipc_crypto_xmit(struct net *net, struct sk_buff **skb,\n--\nnet/tipc/crypto.c-1800- * as the callback, the encryption header and auth tag will be trimmed out\nnet/tipc/crypto.c:1801: * before forwarding to tipc_rcv() via the tipc_crypto_rcv_complete().\nnet/tipc/crypto.c-1802- * Otherwise, the skb will be freed!\n--\nnet/tipc/crypto.c=1897=static void tipc_crypto_rcv_complete(struct net *net, struct tipc_aead *aead,\n--\nnet/tipc/crypto.c-1918-\t\t\tif (err == -EBADMSG \u0026\u0026 (*skb)-\u003enext)\nnet/tipc/crypto.c:1919:\t\t\t\ttipc_rcv(net, (*skb)-\u003enext, b);\nnet/tipc/crypto.c-1920-\t\t\tgoto free_skb;\n--\nnet/tipc/crypto.c-1962-rcv:\nnet/tipc/crypto.c:1963:\t/* Remove ehdr \u0026 auth. tag prior to tipc_rcv() */\nnet/tipc/crypto.c-1964-\tehdr = (struct tipc_ehdr *)(*skb)-\u003edata;\n--\nnet/tipc/node.c=1938=static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,\n--\nnet/tipc/node.c-2082-/**\nnet/tipc/node.c:2083: * tipc_rcv - process TIPC packets/messages arriving from off-node\nnet/tipc/node.c-2084- * @net: the applicable net namespace\n--\nnet/tipc/node.c-2090- */\nnet/tipc/node.c:2091:void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)\nnet/tipc/node.c-2092-{\n--\nnet/tipc/topsrv.c=633=static int tipc_topsrv_work_start(struct tipc_topsrv *s)\nnet/tipc/topsrv.c-634-{\nnet/tipc/topsrv.c:635:\ts-\u003ercv_wq = alloc_ordered_workqueue(\"tipc_rcv\", 0);\nnet/tipc/topsrv.c-636-\tif (!s-\u003ercv_wq) {\n--\nnet/tipc/udp_media.c=368=static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)\n--\nnet/tipc/udp_media.c-388-\t\tTIPC_SKB_CB(skb)-\u003eflags = 0;\nnet/tipc/udp_media.c:389:\t\ttipc_rcv(sock_net(sk), skb, b);\nnet/tipc/udp_media.c-390-\t\treturn 0;\n"
} |
| 9/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 6746 output: 30 thoughts: 133 Thoughts: **Analyzing the TIPC Packet Reception Path** Okay, so I'm looking at how TIPC messages are received, and `tipc_rcv` is the central function here. I see it's triggered from two distinct paths: `tipc_l2_rcv_msg`, which handles the Ethernet-based direct transmission using the ETH_P_TIPC protocol, and `tipc_udp_recv`, which is handling the UDP encapsulation of TIPC messages. That confirms the code path I'm examining is definitely reachable through network packets, and any changes I make here will have a functional impact. Now, this particular change limits the total size of a reassembled fragment chain. It seems the limit is set at `2 * MAX_MSG_SIZE`. This is the important part - the size of fragments is now double that of `MAX_MSG_SIZE`, which is defined somewhere in `net/tipc/msg.h` or a related header file. I need to verify what the actual value of `MAX_MSG_SIZE` is to understand the implications of this change. Let's go check that definition to get the full picture. |
| 10/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "MAX_MSG_SIZE",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/group.c-47-\nnet/tipc/group.c:48:#define ADV_UNIT (((MAX_MSG_SIZE + MAX_H_SIZE) / FLOWCTL_BLK_SZ) + 1)\nnet/tipc/group.c-49-#define ADV_IDLE ADV_UNIT\n--\nnet/tipc/link.c=1295=static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1319-\t\t\t/* A legitimate reassembled message can never exceed\nnet/tipc/link.c:1320:\t\t\t * MAX_MSG_SIZE. Limit the memory one incomplete\nnet/tipc/link.c-1321-\t\t\t * fragment chain can pin, otherwise a peer can grow\n--\nnet/tipc/link.c-1326-\t\t\t */\nnet/tipc/link.c:1327:\t\t\tif ((*reasm_skb)-\u003etruesize \u003e 2 * MAX_MSG_SIZE) {\nnet/tipc/link.c-1328-\t\t\t\tpr_warn_ratelimited(\"Fragment chain larger than %u bytes, dropping\\n\",\nnet/tipc/link.c:1329:\t\t\t\t\t\t 2 * MAX_MSG_SIZE);\nnet/tipc/link.c-1330-\t\t\t\tkfree_skb(*reasm_skb);\n--\nnet/tipc/msg.c=384=int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset,\n--\nnet/tipc/msg.c-405-\t\tif (unlikely(!skb)) {\nnet/tipc/msg.c:406:\t\t\tif (pktmax != MAX_MSG_SIZE)\nnet/tipc/msg.c-407-\t\t\t\treturn -ENOMEM;\n--\nnet/tipc/msg.h=49=struct plist;\n--\nnet/tipc/msg.h-100-\nnet/tipc/msg.h:101:#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)\nnet/tipc/msg.h-102-#define TIPC_MEDIA_INFO_OFFSET\t5\n--\nnet/tipc/node.c=205=int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel, bool connected)\n--\nnet/tipc/node.c-208-\tint bearer_id;\nnet/tipc/node.c:209:\tunsigned int mtu = MAX_MSG_SIZE;\nnet/tipc/node.c-210-\n--\nnet/tipc/node.c-214-\nnet/tipc/node.c:215:\t/* Allow MAX_MSG_SIZE when building connection oriented message\nnet/tipc/node.c-216-\t * if they are in the same core network\n--\nnet/tipc/socket.c=253=static void tsk_set_nagle(struct tipc_sock *tsk)\n--\nnet/tipc/socket.c-264-\t/* Limit node local buffer size to avoid receive queue overflow */\nnet/tipc/socket.c:265:\tif (tsk-\u003emax_pkt == MAX_MSG_SIZE)\nnet/tipc/socket.c-266-\t\ttsk-\u003emaxnagle = 1500;\n--\nnet/tipc/socket.h-42-#define FLOWCTL_MSG_WIN 512\nnet/tipc/socket.h:43:#define FLOWCTL_MSG_LIM ((FLOWCTL_MSG_WIN * 2 + 1) * SKB_TRUESIZE(MAX_MSG_SIZE))\nnet/tipc/socket.h-44-\n"
} |
| 11/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 8101 output: 32 thoughts: 71 Thoughts: **Analyzing the TIPC Link Input Change** Okay, so the change I need to understand is specifically within `tipc_link_input`. My initial thought is to trace the execution path. It looks like `tipc_rcv` is the entry point, which calls `tipc_node_check_state`. I'm reasonably confident that `tipc_node_check_state` then calls `tipc_link_rcv`, and finally, we arrive at `tipc_link_input`. That seems like the most probable flow. Given this, I should start my deeper dive into the code by focusing on `tipc_link_rcv`. This is the logical next step to properly understand the impact of the modifications made. |
| 12/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "tipc_link_rcv",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/bcast.c=436=int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb)\n--\nnet/tipc/bcast.c-453-\telse\nnet/tipc/bcast.c:454:\t\trc = tipc_link_rcv(l, skb, NULL);\nnet/tipc/bcast.c-455-\ttipc_bcast_unlock(net);\n--\nnet/tipc/link.c=423=int tipc_link_mss(struct tipc_link *l)\n--\nnet/tipc/link.c-431-\nnet/tipc/link.c:432:u16 tipc_link_rcv_nxt(struct tipc_link *l)\nnet/tipc/link.c-433-{\n--\nnet/tipc/link.c=1747=static int tipc_link_build_nack_msg(struct tipc_link *l,\n--\nnet/tipc/link.c-1771-\nnet/tipc/link.c:1772:/* tipc_link_rcv - process TIPC packets/messages arriving from off-node\nnet/tipc/link.c-1773- * @l: the link that should handle the message\n--\nnet/tipc/link.c-1776- */\nnet/tipc/link.c:1777:int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,\nnet/tipc/link.c-1778-\t\t struct sk_buff_head *xmitq)\n--\nnet/tipc/link.h=109=struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);\nnet/tipc/link.h:110:u16 tipc_link_rcv_nxt(struct tipc_link *l);\nnet/tipc/link.h-111-u16 tipc_link_acked(struct tipc_link *l);\n--\nnet/tipc/link.h=131=int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);\nnet/tipc/link.h:132:int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,\nnet/tipc/link.h-133-\t\t struct sk_buff_head *xmitq);\n--\nnet/tipc/node.c=958=static void tipc_node_link_failover(struct tipc_node *n, struct tipc_link *l,\n--\nnet/tipc/node.c-972-\nnet/tipc/node.c:973:\tn-\u003esync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);\nnet/tipc/node.c-974-\ttipc_link_failover_prepare(l, tnl, xmitq);\n--\nnet/tipc/node.c=988=static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,\n--\nnet/tipc/node.c-1051-\ttipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);\nnet/tipc/node.c:1052:\tn-\u003esync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);\nnet/tipc/node.c-1053-\ttipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);\n--\nnet/tipc/node.c=1938=static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,\n--\nnet/tipc/node.c-1958-\t\treturn false;\nnet/tipc/node.c:1959:\trcv_nxt = tipc_link_rcv_nxt(l);\nnet/tipc/node.c-1960-\n--\nnet/tipc/node.c-2064-\t\tinputq_len = skb_queue_len(tipc_link_inputq(pl));\nnet/tipc/node.c:2065:\t\tdlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;\nnet/tipc/node.c-2066-\t\tif (more(dlv_nxt, n-\u003esync_point)) {\n--\nnet/tipc/node.c=2091=void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)\n--\nnet/tipc/node.c-2171-\t\tif (le-\u003elink) {\nnet/tipc/node.c:2172:\t\t\trc = tipc_link_rcv(le-\u003elink, skb, \u0026xmitq);\nnet/tipc/node.c-2173-\t\t\tskb = NULL;\n--\nnet/tipc/node.c-2185-\t\t\tif (le-\u003elink) {\nnet/tipc/node.c:2186:\t\t\t\trc = tipc_link_rcv(le-\u003elink, skb, \u0026xmitq);\nnet/tipc/node.c-2187-\t\t\t\tskb = NULL;\n"
} |
| 13/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9762 output: 31 thoughts: 205 Thoughts: **Analyzing the TIPC Memory Growth Prevention Change** Okay, so the core of this change seems to be within `tipc_link_input`. It looks like this is a functional improvement, specifically designed to address and prevent unbounded memory growth – a critical issue in any network protocol implementation. The good news is, based on the information, this is reachable through standard TIPC packet processing, so we're not looking at some obscure edge case here. The relevant configuration is straightforward: `TIPC`. That's reasonable. Now, where do we trace this through the code? The focus symbols for tracing the path through the functions should be either `tipc_link_rcv` or `tipc_rcv`. Let's check those out. `tipc_rcv` looks like the main entry point, as you'd expect. Then, `tipc_link_rcv`, which is specific to link reception, probably gets us closer to `tipc_link_input`. We also have `tipc_bcast_rcv` for broadcast, `tipc_link_tnl_rcv` for tunnels, `tipc_udp_recv` for UDP, and `tipc_l2_rcv_msg` for L2 messages. Alright, let's circle back to `tipc_link_input` and start digging in from there. |
| 14/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "tipc_link_input",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/link.c=338=unsigned long tipc_link_tolerance(struct tipc_link *l)\n--\nnet/tipc/link.c-342-\nnet/tipc/link.c:343:struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)\nnet/tipc/link.c-344-{\n--\nnet/tipc/link.c=1244=static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1290-\nnet/tipc/link.c:1291:/* tipc_link_input - process packet that has passed link protocol check\nnet/tipc/link.c-1292- *\n--\nnet/tipc/link.c-1294- */\nnet/tipc/link.c:1295:static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,\nnet/tipc/link.c-1296-\t\t\t struct sk_buff_head *inputq,\n--\nnet/tipc/link.c=1355=static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1411-\t\tif (!tipc_data_input(l, iskb, inputq))\nnet/tipc/link.c:1412:\t\t\trc |= tipc_link_input(l, iskb, inputq, reasm_skb);\nnet/tipc/link.c-1413-\t\tif (unlikely(rc))\n--\nnet/tipc/link.c=1777=int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,\n--\nnet/tipc/link.c-1829-\t\telse if (!tipc_data_input(l, skb, l-\u003einputq))\nnet/tipc/link.c:1830:\t\t\trc |= tipc_link_input(l, skb, l-\u003einputq, \u0026l-\u003ereasm_buf);\nnet/tipc/link.c-1831-\t\tif (unlikely(++l-\u003ercv_unacked \u003e= TIPC_MIN_LINK_WIN))\n--\nnet/tipc/link.h=107=int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,\nnet/tipc/link.h-108-\t\t struct sk_buff_head *xmitq);\nnet/tipc/link.h:109:struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);\nnet/tipc/link.h-110-u16 tipc_link_rcv_nxt(struct tipc_link *l);\n--\nnet/tipc/node.c=1938=static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,\n--\nnet/tipc/node.c-2008-\t\t\t\t\t\t \"node link down \u003c- failover!\");\nnet/tipc/node.c:2009:\t\t\ttipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),\nnet/tipc/node.c:2010:\t\t\t\t\t\t\ttipc_link_inputq(l));\nnet/tipc/node.c-2011-\t\t}\n--\nnet/tipc/node.c-2063-\t\t}\nnet/tipc/node.c:2064:\t\tinputq_len = skb_queue_len(tipc_link_inputq(pl));\nnet/tipc/node.c-2065-\t\tdlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;\n"
} |
| 15/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11287 output: 28 thoughts: 55 Thoughts: Okay, let's see, my initial impression is that `tipc_link_rcv` seems like a really solid focus for this. I've always found that function to be particularly insightful in this area. And, you know, `tipc_rcv` is also a very compelling candidate for closer examination. But before I get too deep into either of those, I should probably take a more comprehensive look at the configuration. I want to make sure I'm not missing any important settings. The primary one, of course, is `CONFIG_TIPC`. I'll want to verify that. Let's see if there are any other supporting configurations that need a closer look. I'll need to double check those. |
| 16/2 | 2026/08/18 19:07 | tool | grepper |
0mArgs:{
"Expression": "config TIPC",
"PathPrefix": "net/tipc/"
}Results: {
"Output": "net/tipc/Kconfig-5-\nnet/tipc/Kconfig:6:menuconfig TIPC\nnet/tipc/Kconfig-7-\ttristate \"The TIPC Protocol\"\n--\nnet/tipc/Kconfig-23-\nnet/tipc/Kconfig:24:config TIPC_MEDIA_IB\nnet/tipc/Kconfig-25-\tbool \"InfiniBand media type support\"\n--\nnet/tipc/Kconfig-29-\t IP-over-InfiniBand devices.\nnet/tipc/Kconfig:30:config TIPC_MEDIA_UDP\nnet/tipc/Kconfig-31-\tbool \"IP/UDP media type support\"\n--\nnet/tipc/Kconfig-37-\nnet/tipc/Kconfig:38:config TIPC_CRYPTO\nnet/tipc/Kconfig-39-\tbool \"TIPC encryption support\"\n--\nnet/tipc/Kconfig-52-\nnet/tipc/Kconfig:53:config TIPC_DIAG\nnet/tipc/Kconfig-54-\ttristate \"TIPC: socket monitoring interface\"\n"
} |
| 17/2 | 2026/08/18 19:07 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11812 output: 125 thoughts: 437 Thoughts: **My Analysis of the TIPC Configuration Change**
Okay, so the core of this change lies within `TIPC`, the main configuration file, as expected. The patch itself focuses on preventing a potential denial-of-service vulnerability related to reassembled fragment chains. Specifically, it introduces a crucial check to drop a reassembled fragment chain if its size exceeds `2 * MAX_MSG_SIZE`. This is a functional alteration; we're actively changing how the system handles certain network packets based on size. That screams "fuzzing target" to me, right away. So the focus symbols for testing will definitely be `tipc_link_rcv` and `tipc_rcv`.
Now, let's just make absolutely sure I've got this right. I'm going to quickly double-check the `tipc_link_input` function within `net/tipc/link.c`. Ah, yes, here it is:
```c
if (tipc_buf_append(reasm_skb, &skb)) {
l->stats.recv_fragmented++;
tipc_data_input(l, skb, inputq);
} else if (*reasm_skb) {
/* A legitimate reassembled message can never exceed
* MAX_MSG_SIZE. Limit the memory one incomplete
* fragment chain can pin, otherwise a peer can grow
* kernel memory unboundedly by streaming fragment
* chains that never complete: received traffic also
* resets the link silence counter, so the link never
* times out and the chains are never freed.
*/
if ((*reasm_skb)->truesize > 2 * MAX_MSG_SIZE) {
pr_warn_ratelimited("Fragment chain larger than %u bytes, dropping\n",
2 * MAX_MSG_SIZE);
kfree_skb(*reasm_skb);
*reasm_skb = NULL;
}
} else if (!link_is_bc_rcvlink(l)) {
pr_warn_ratelimited("Unable to build fragment list\n");
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
}
```
Yup, that confirms it. This is a solid, functional change. It directly addresses the issue of potentially unbounded memory consumption by intentionally dropping excessively large, incomplete fragment chains and freeing the memory associated with them. This is accessible from the `tipc_link_rcv` path, which is exactly where I thought it would be. Okay, I'm satisfied. Now I'm going to set up the appropriate configurations based on these findings.
|
| 18/2 | 2026/08/18 19:07 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"TIPC"
],
"FocusSymbols": [
"tipc_link_rcv",
"tipc_rcv"
],
"Reasoning": "The patch introduces a functional change in the TIPC fragment reassembly logic to prevent unbounded memory growth. It adds a check to drop incomplete fragment chains if their size exceeds `2 * MAX_MSG_SIZE`. This code is reachable via normal TIPC packet processing paths, specifically through `tipc_rcv` and `tipc_link_rcv`.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"TIPC"
],
"FocusSymbols": [
"tipc_link_rcv",
"tipc_rcv"
],
"Reasoning": "The patch introduces a functional change in the TIPC fragment reassembly logic to prevent unbounded memory growth. It adds a check to drop incomplete fragment chains if their size exceeds `2 * MAX_MSG_SIZE`. This code is reachable via normal TIPC packet processing paths, specifically through `tipc_rcv` and `tipc_link_rcv`.",
"WorthFuzzing": true
} |
| 19/1 | 2026/08/18 19:07 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 20/2 | 2026/08/18 19:07 | agent | kmsan-evaluator |
0mModel:best-expensive Args: null Results: {
"KMSANReasoning": "The patch addresses a potential memory exhaustion (DoS) vulnerability in the TIPC subsystem where a peer could stream incomplete fragment chains to unboundedly grow kernel memory. The fix introduces a size limit check (`truesize \u003e 2 * MAX_MSG_SIZE`) for incomplete reassembled messages and frees the skb if the limit is exceeded. This change does not introduce any new data structures, allocations, or user-space copies that could expose uninitialized memory. The bug being fixed is related to resource management and memory leaks, which are not in the scope of KMSAN (KernelMemorySanitizer). Standard fuzzing with KASAN and kmemleak is sufficient for detecting memory corruption or leak issues in this context.",
"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: For your convenience, here is the diff of the changes:
commit d1479caab492d1ab8a235688ef318669bd51aec9
Author: syz-cluster <triage@syzkaller.com>
Date: Tue Aug 18 19:07:07 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 49dfc098d89b2..bf61c9ac4ea21 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1315,7 +1315,22 @@ static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
if (tipc_buf_append(reasm_skb, &skb)) {
l->stats.recv_fragmented++;
tipc_data_input(l, skb, inputq);
- } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
+ } else if (*reasm_skb) {
+ /* A legitimate reassembled message can never exceed
+ * MAX_MSG_SIZE. Limit the memory one incomplete
+ * fragment chain can pin, otherwise a peer can grow
+ * kernel memory unboundedly by streaming fragment
+ * chains that never complete: received traffic also
+ * resets the link silence counter, so the link never
+ * times out and the chains are never freed.
+ */
+ if ((*reasm_skb)->truesize > 2 * MAX_MSG_SIZE) {
+ pr_warn_ratelimited("Fragment chain larger than %u bytes, dropping\n",
+ 2 * MAX_MSG_SIZE);
+ kfree_skb(*reasm_skb);
+ *reasm_skb = NULL;
+ }
+ } else if (!link_is_bc_rcvlink(l)) {
pr_warn_ratelimited("Unable to build fragment list\n");
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
}
|
| 21/3 | 2026/08/18 19:07 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2244 output: 171 thoughts: 585 Thoughts: **My Assessment of the TIPC Fragment Handling Patch** Okay, so this patch is in `net/tipc/link.c` and targets the `tipc_link_input` function. It's designed to address a potential denial-of-service vulnerability related to fragmented TIPC messages. The core of the fix is a size check on `reasm_skb` after `tipc_buf_append` returns false. Essentially, if the fragment chain isn't complete (or there's an error in appending), and if `reasm_skb` exists and its `truesize` exceeds `2 * MAX_MSG_SIZE`, then it's freed. This prevents an attacker from sending a flood of fragmented messages that never fully reassemble, thereby consuming unbounded amounts of kernel memory. Crucially, the check and free operation is performed only if the maximum message size is exceeded. My initial thought is to assess the potential for uninitialized memory issues. However, after careful review, it seems there's no risk in this area. The patch doesn't introduce any new memory allocations, it's not copying data to user space, and it doesn't appear to be using any uninitialized variables. This is purely a defense against a memory leak/DoS scenario. KMSAN (Kernel Memory Sanitizer) is specifically designed to detect uninitialized memory reads, but this fix doesn't introduce any such risk. The vulnerability being addressed is a memory exhaustion issue. Standard fuzzing, memory leak detection tools (like `kmemleak`), or OOM detectors *could* catch related issues, but KMSAN is not relevant here. I double-checked the code snippet to be certain: the added `if` statement clearly checks the size of the reassembled SKB and frees it if too large, in order to limit the amount of memory a single incomplete fragment chain can occupy. This is a very targeted fix against an observed behavior that is likely related to the link's keep-alive mechanisms and the link's ability to time out incomplete transmissions. No uninitialized memory is touched, no pointers are left dangling and no memory is allocated within the scope of this vulnerability's mitigation. Therefore, the `NeedsKMSAN` flag is definitely `false`. This patch is a straightforward defense against memory exhaustion. |
| 22/3 | 2026/08/18 19:07 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch addresses a potential memory exhaustion (DoS) vulnerability in the TIPC subsystem where a peer could stream incomplete fragment chains to unboundedly grow kernel memory. The fix introduces a size limit check (`truesize \u003e 2 * MAX_MSG_SIZE`) for incomplete reassembled messages and frees the skb if the limit is exceeded. This change does not introduce any new data structures, allocations, or user-space copies that could expose uninitialized memory. The bug being fixed is related to resource management and memory leaks, which are not in the scope of KMSAN (KernelMemorySanitizer). Standard fuzzing with KASAN and kmemleak is sufficient for detecting memory corruption or leak issues in this context.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch addresses a potential memory exhaustion (DoS) vulnerability in the TIPC subsystem where a peer could stream incomplete fragment chains to unboundedly grow kernel memory. The fix introduces a size limit check (`truesize \u003e 2 * MAX_MSG_SIZE`) for incomplete reassembled messages and frees the skb if the limit is exceeded. This change does not introduce any new data structures, allocations, or user-space copies that could expose uninitialized memory. The bug being fixed is related to resource management and memory leaks, which are not in the scope of KMSAN (KernelMemorySanitizer). Standard fuzzing with KASAN and kmemleak is sufficient for detecting memory corruption or leak issues in this context.",
"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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