AI Trajectory

null

{
  "EnableConfigs": [
    "RDS",
    "RDS_TCP"
  ],
  "FocusSymbols": [
    "rds_info_getsockopt",
    "rds_getsockopt"
  ],
  "Reasoning": "The patch modifies the RDS getsockopt implementation to use SRCU for protecting the rds_info_funcs array, fixing a race condition with module unloading. This is a functional change in reachable core kernel logic.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 31c85b6b4472196884c26b07fea67e122a940481\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Jul 21 03:08:04 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/rds/af_rds.c b/net/rds/af_rds.c\nindex d5defe9172e365..b3fe2bd6ea3547 100644\n--- a/net/rds/af_rds.c\n+++ b/net/rds/af_rds.c\n@@ -925,6 +925,12 @@ static void rds6_sock_info(struct socket *sock, unsigned int len,\n static void rds_exit(void)\n {\n \tsock_unregister(rds_family_ops.family);\n+\trds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);\n+\trds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);\n+#if IS_ENABLED(CONFIG_IPV6)\n+\trds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);\n+\trds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);\n+#endif\n \tproto_unregister(\u0026rds_proto);\n \trds_conn_exit();\n \trds_cong_exit();\n@@ -933,12 +939,6 @@ static void rds_exit(void)\n \trds_stats_exit();\n \trds_page_exit();\n \trds_bind_lock_destroy();\n-\trds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);\n-\trds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);\n-#if IS_ENABLED(CONFIG_IPV6)\n-\trds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);\n-\trds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);\n-#endif\n }\n module_exit(rds_exit);\n \ndiff --git a/net/rds/info.c b/net/rds/info.c\nindex 21b32eb1655997..7d6f3552d65b61 100644\n--- a/net/rds/info.c\n+++ b/net/rds/info.c\n@@ -32,6 +32,7 @@\n  */\n #include \u003clinux/percpu.h\u003e\n #include \u003clinux/seq_file.h\u003e\n+#include \u003clinux/srcu.h\u003e\n #include \u003clinux/slab.h\u003e\n #include \u003clinux/proc_fs.h\u003e\n #include \u003clinux/export.h\u003e\n@@ -68,8 +69,9 @@ struct rds_info_iterator {\n \tunsigned long offset;\n };\n \n+DEFINE_STATIC_SRCU(rds_info_srcu);\n static DEFINE_SPINLOCK(rds_info_lock);\n-static rds_info_func rds_info_funcs[RDS_INFO_LAST - RDS_INFO_FIRST + 1];\n+static rds_info_func __rcu rds_info_funcs[RDS_INFO_LAST - RDS_INFO_FIRST + 1];\n \n void rds_info_register_func(int optname, rds_info_func func)\n {\n@@ -78,8 +80,8 @@ void rds_info_register_func(int optname, rds_info_func func)\n \tBUG_ON(optname \u003c RDS_INFO_FIRST || optname \u003e RDS_INFO_LAST);\n \n \tspin_lock(\u0026rds_info_lock);\n-\tBUG_ON(rds_info_funcs[offset]);\n-\trds_info_funcs[offset] = func;\n+\tBUG_ON(rcu_access_pointer(rds_info_funcs[offset]));\n+\trcu_assign_pointer(rds_info_funcs[offset], func);\n \tspin_unlock(\u0026rds_info_lock);\n }\n EXPORT_SYMBOL_GPL(rds_info_register_func);\n@@ -91,9 +93,10 @@ void rds_info_deregister_func(int optname, rds_info_func func)\n \tBUG_ON(optname \u003c RDS_INFO_FIRST || optname \u003e RDS_INFO_LAST);\n \n \tspin_lock(\u0026rds_info_lock);\n-\tBUG_ON(rds_info_funcs[offset] != func);\n-\trds_info_funcs[offset] = NULL;\n+\tBUG_ON(rcu_access_pointer(rds_info_funcs[offset]) != func);\n+\tRCU_INIT_POINTER(rds_info_funcs[offset], NULL);\n \tspin_unlock(\u0026rds_info_lock);\n+\tsynchronize_srcu(\u0026rds_info_srcu);\n }\n EXPORT_SYMBOL_GPL(rds_info_deregister_func);\n \n@@ -165,6 +168,7 @@ int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)\n \tint npages = 0;\n \tint ret;\n \tint len;\n+\tint srcu_idx;\n \tint total;\n \n \tlen = opt-\u003eoptlen;\n@@ -214,8 +218,11 @@ int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)\n \trdsdebug(\"len %d nr_pages %lu\\n\", len, nr_pages);\n \n call_func:\n-\tfunc = rds_info_funcs[optname - RDS_INFO_FIRST];\n+\tsrcu_idx = srcu_read_lock(\u0026rds_info_srcu);\n+\tfunc = srcu_dereference(rds_info_funcs[optname - RDS_INFO_FIRST],\n+\t\t\t\t\u0026rds_info_srcu);\n \tif (!func) {\n+\t\tsrcu_read_unlock(\u0026rds_info_srcu, srcu_idx);\n \t\tret = -ENOPROTOOPT;\n \t\tgoto out;\n \t}\n@@ -225,6 +232,7 @@ int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)\n \titer.offset = offset0;\n \n \tfunc(sock, len, \u0026iter, \u0026lens);\n+\tsrcu_read_unlock(\u0026rds_info_srcu, srcu_idx);\n \tBUG_ON(lens.each == 0);\n \n \ttotal = lens.nr * lens.each;\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "RDS",
    "RDS_TCP"
  ],
  "FocusSymbols": [
    "rds_info_getsockopt",
    "rds_getsockopt"
  ],
  "Reasoning": "The patch modifies the RDS getsockopt implementation to use SRCU for protecting the rds_info_funcs array, fixing a race condition with module unloading. This is a functional change in reachable core kernel logic.",
  "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 31c85b6b4472196884c26b07fea67e122a940481
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Jul 21 03:08:04 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index d5defe9172e365..b3fe2bd6ea3547 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -925,6 +925,12 @@ static void rds6_sock_info(struct socket *sock, unsigned int len,
 static void rds_exit(void)
 {
 	sock_unregister(rds_family_ops.family);
+	rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
+	rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
+#if IS_ENABLED(CONFIG_IPV6)
+	rds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);
+	rds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
+#endif
 	proto_unregister(&rds_proto);
 	rds_conn_exit();
 	rds_cong_exit();
@@ -933,12 +939,6 @@ static void rds_exit(void)
 	rds_stats_exit();
 	rds_page_exit();
 	rds_bind_lock_destroy();
-	rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
-	rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
-#if IS_ENABLED(CONFIG_IPV6)
-	rds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);
-	rds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
-#endif
 }
 module_exit(rds_exit);
 
diff --git a/net/rds/info.c b/net/rds/info.c
index 21b32eb1655997..7d6f3552d65b61 100644
--- a/net/rds/info.c
+++ b/net/rds/info.c
@@ -32,6 +32,7 @@
  */
 #include <linux/percpu.h>
 #include <linux/seq_file.h>
+#include <linux/srcu.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
 #include <linux/export.h>
@@ -68,8 +69,9 @@ struct rds_info_iterator {
 	unsigned long offset;
 };
 
+DEFINE_STATIC_SRCU(rds_info_srcu);
 static DEFINE_SPINLOCK(rds_info_lock);
-static rds_info_func rds_info_funcs[RDS_INFO_LAST - RDS_INFO_FIRST + 1];
+static rds_info_func __rcu rds_info_funcs[RDS_INFO_LAST - RDS_INFO_FIRST + 1];
 
 void rds_info_register_func(int optname, rds_info_func func)
 {
@@ -78,8 +80,8 @@ void rds_info_register_func(int optname, rds_info_func func)
 	BUG_ON(optname < RDS_INFO_FIRST || optname > RDS_INFO_LAST);
 
 	spin_lock(&rds_info_lock);
-	BUG_ON(rds_info_funcs[offset]);
-	rds_info_funcs[offset] = func;
+	BUG_ON(rcu_access_pointer(rds_info_funcs[offset]));
+	rcu_assign_pointer(rds_info_funcs[offset], func);
 	spin_unlock(&rds_info_lock);
 }
 EXPORT_SYMBOL_GPL(rds_info_register_func);
@@ -91,9 +93,10 @@ void rds_info_deregister_func(int optname, rds_info_func func)
 	BUG_ON(optname < RDS_INFO_FIRST || optname > RDS_INFO_LAST);
 
 	spin_lock(&rds_info_lock);
-	BUG_ON(rds_info_funcs[offset] != func);
-	rds_info_funcs[offset] = NULL;
+	BUG_ON(rcu_access_pointer(rds_info_funcs[offset]) != func);
+	RCU_INIT_POINTER(rds_info_funcs[offset], NULL);
 	spin_unlock(&rds_info_lock);
+	synchronize_srcu(&rds_info_srcu);
 }
 EXPORT_SYMBOL_GPL(rds_info_deregister_func);
 
@@ -165,6 +168,7 @@ int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)
 	int npages = 0;
 	int ret;
 	int len;
+	int srcu_idx;
 	int total;
 
 	len = opt->optlen;
@@ -214,8 +218,11 @@ int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)
 	rdsdebug("len %d nr_pages %lu\n", len, nr_pages);
 
 call_func:
-	func = rds_info_funcs[optname - RDS_INFO_FIRST];
+	srcu_idx = srcu_read_lock(&rds_info_srcu);
+	func = srcu_dereference(rds_info_funcs[optname - RDS_INFO_FIRST],
+				&rds_info_srcu);
 	if (!func) {
+		srcu_read_unlock(&rds_info_srcu, srcu_idx);
 		ret = -ENOPROTOOPT;
 		goto out;
 	}
@@ -225,6 +232,7 @@ int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)
 	iter.offset = offset0;
 
 	func(sock, len, &iter, &lens);
+	srcu_read_unlock(&rds_info_srcu, srcu_idx);
 	BUG_ON(lens.each == 0);
 
 	total = lens.nr * lens.each;

gemini-3.1-pro-preview

null

null

							input: 3317
							output: 28
							thoughts: 311
						

**Analyzing a Recent RDS Patch**

Okay, so I'm looking at this patch for `net/rds/af_rds.c` and `net/rds/info.c`. The core change is making the `rds_info_funcs` array RCU-protected – specifically, using SRCU. I see it's employing `DEFINE_STATIC_SRCU(rds_info_srcu)` and `synchronize_srcu(&rds_info_srcu)` in `rds_info_deregister_func`. Smart move, that handles the write side. On the read side, `rds_info_getsockopt` now uses `srcu_read_lock` and `srcu_dereference` – standard for SRCU protection, ensuring read-side access to the array is consistent.

I'm also noting that the patch modifies the cleanup order in `rds_exit`, moving the unregistration of `rds_info_funcs` earlier. Wait a second, `rds_exit` is the module exit function, isn't it? So, this isn't something that's touched during normal operation, only module unload. But, `rds_info_getsockopt` is absolutely part of normal execution and can be hit through a `getsockopt` call on an RDS socket.

Ah, I see it now. The patch is addressing a race condition between `getsockopt` and the module unloading. That's the key. This prevents a use-after-free scenario. It's subtle, but important.

Should I fuzz this? Absolutely. It touches `rds_info_getsockopt`, which is a core part of how RDS socket options work, and we know there's a race condition. Fuzzing `getsockopt` with RDS sockets is definitely possible, especially with concurrent reads and unload attempts.

Let me check the `net/rds/Kconfig` file, I need to see how RDS is configured to get started.

{
  "Expression": "config RDS",
  "PathPrefix": "net/rds/Kconfig"
}

{
  "Output": "net/rds/Kconfig-2-\nnet/rds/Kconfig:3:config RDS\nnet/rds/Kconfig-4-\ttristate \"The Reliable Datagram Sockets Protocol\"\n--\nnet/rds/Kconfig-9-\nnet/rds/Kconfig:10:config RDS_RDMA\nnet/rds/Kconfig-11-\ttristate \"RDS over Infiniband\"\n--\nnet/rds/Kconfig-16-\nnet/rds/Kconfig:17:config RDS_TCP\nnet/rds/Kconfig-18-\ttristate \"RDS over TCP\"\n--\nnet/rds/Kconfig-24-\nnet/rds/Kconfig:25:config RDS_DEBUG\nnet/rds/Kconfig-26-\tbool \"RDS debugging messages\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 4276
							output: 31
							thoughts: 87
						

Okay, here's my breakdown of what's going on, thinking like a seasoned kernel developer:

**Decoding the RDS Configuration Changes**

Right, so `CONFIG_RDS` – that's the primary configuration switch we're dealing with. My first instinct is always to see if this is just the tip of the iceberg, or if there are related configurations that are also being tweaked or impacted. Gotta check for any associated `#ifdef` blocks or dependencies to get the complete picture.

Now, looking at the patch, I see modifications to `net/rds/info.c` and `net/rds/af_rds.c`. Okay, so it's touching the RDS (Reliable Datagram Sockets) infrastructure, specifically related to getting information and probably address family management. The key function that's being directly changed is `rds_info_getsockopt`. Let's zero in on that function in `net/rds/info.c`. That's where the real meat of the change is likely to be. I'll need to understand what that function does, what it used to do, and what the modification actually entails to understand the purpose of this change.

{
  "Expression": "rds_info_getsockopt",
  "PathPrefix": "net/rds/"
}

{
  "Output": "net/rds/af_rds.c=488=static int rds_getsockopt(struct socket *sock, int level, int optname,\n--\nnet/rds/af_rds.c-502-\tcase RDS_INFO_FIRST ... RDS_INFO_LAST:\nnet/rds/af_rds.c:503:\t\tret = rds_info_getsockopt(sock, optname, opt);\nnet/rds/af_rds.c-504-\t\tbreak;\n--\nnet/rds/info.c=148=EXPORT_SYMBOL_GPL(rds_info_copy);\n--\nnet/rds/info.c-159- */\nnet/rds/info.c:160:int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt)\nnet/rds/info.c-161-{\n--\nnet/rds/info.h=23=void rds_info_deregister_func(int optname, rds_info_func func);\nnet/rds/info.h:24:int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt);\nnet/rds/info.h-25-void rds_info_copy(struct rds_info_iterator *iter, void *data,\n"
}

gemini-3.1-pro-preview

null

null

							input: 4977
							output: 28
							thoughts: 104
						

**My Initial Assessment of the RDS Socket Information Flow**

Okay, so I'm zeroing in on this `rds_info` structure and its related functions within the RDS subsystem. My primary target is the `rds_info_getsockopt` function; that's where the core socket option retrieval logic seems to reside. Let's make sure I haven't missed anything obvious. Aha, there's also `rds_info_register_func` and `rds_info_deregister_func`. I see that `rds_info_deregister_func` is critical for cleanup, specifically during module exit or when a transport is unregistered – important for resource management. The `rds_info_getsockopt` function seems to be called from `rds_getsockopt`, which makes sense. Socket option retrieval is its primary responsibility.

Now, from the perspective of enabling the feature, I'll need the `RDS` configuration to be enabled. I wonder if that’s the only dependency, or if there are other, more granular dependencies that I might need to consider for more advanced or specific functionalities. I will need to verify if `RDS` is the correct level for my goal.

{
  "Expression": "config RDS",
  "PathPrefix": "net/rds/Kconfig"
}

{
  "Output": "net/rds/Kconfig-2-\nnet/rds/Kconfig:3:config RDS\nnet/rds/Kconfig-4-\ttristate \"The Reliable Datagram Sockets Protocol\"\n--\nnet/rds/Kconfig-9-\nnet/rds/Kconfig:10:config RDS_RDMA\nnet/rds/Kconfig-11-\ttristate \"RDS over Infiniband\"\n--\nnet/rds/Kconfig-16-\nnet/rds/Kconfig:17:config RDS_TCP\nnet/rds/Kconfig-18-\ttristate \"RDS over TCP\"\n--\nnet/rds/Kconfig-24-\nnet/rds/Kconfig:25:config RDS_DEBUG\nnet/rds/Kconfig-26-\tbool \"RDS debugging messages\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 5560
							output: 32
							thoughts: 270
						

**Analyzing the RDS Code Patch**

Okay, so this patch messes with `CONFIG_IPV6` within `af_rds.c`, specifically around the `rds6_sock_info` functions. Interesting, although `IPV6` is almost always enabled these days, it's worth noting. My main concern right now is the implications.

My focus is on these symbols: `rds_info_getsockopt`, `rds_info_register_func`, `rds_info_deregister_func`, and `rds_getsockopt`. I need to ensure they are all accounted for, and it looks like `rds_info_getsockopt` is triggered directly from a socket `getsockopt` call, as expected for RDS. `rds_info_deregister_func` is also clearly callable during module unloading, which makes sense.

Wait, looking a bit deeper, I see `rds_info_register_func` and `rds_info_deregister_func` are *also* used in `net/rds/tcp.c`, and `net/rds/ib.c`. Now I need to see exactly where they're being called; I'll need to trace those calls through the code. This is definitely worth a more detailed investigation.

{
  "Expression": "rds_info_deregister_func",
  "PathPrefix": "net/rds/"
}

{
  "Output": "net/rds/af_rds.c=925=static void rds_exit(void)\n--\nnet/rds/af_rds.c-927-\tsock_unregister(rds_family_ops.family);\nnet/rds/af_rds.c:928:\trds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);\nnet/rds/af_rds.c:929:\trds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);\nnet/rds/af_rds.c-930-#if IS_ENABLED(CONFIG_IPV6)\nnet/rds/af_rds.c:931:\trds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);\nnet/rds/af_rds.c:932:\trds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);\nnet/rds/af_rds.c-933-#endif\n--\nnet/rds/connection.c=910=void rds_conn_exit(void)\n--\nnet/rds/connection.c-918-\nnet/rds/connection.c:919:\trds_info_deregister_func(RDS_INFO_CONNECTIONS, rds_conn_info);\nnet/rds/connection.c:920:\trds_info_deregister_func(RDS_INFO_SEND_MESSAGES,\nnet/rds/connection.c-921-\t\t\t\t rds_conn_message_info_send);\nnet/rds/connection.c:922:\trds_info_deregister_func(RDS_INFO_RETRANS_MESSAGES,\nnet/rds/connection.c-923-\t\t\t\t rds_conn_message_info_retrans);\nnet/rds/connection.c-924-#if IS_ENABLED(CONFIG_IPV6)\nnet/rds/connection.c:925:\trds_info_deregister_func(RDS6_INFO_CONNECTIONS, rds6_conn_info);\nnet/rds/connection.c:926:\trds_info_deregister_func(RDS6_INFO_SEND_MESSAGES,\nnet/rds/connection.c-927-\t\t\t\t rds6_conn_message_info_send);\nnet/rds/connection.c:928:\trds_info_deregister_func(RDS6_INFO_RETRANS_MESSAGES,\nnet/rds/connection.c-929-\t\t\t\t rds6_conn_message_info_retrans);\n--\nnet/rds/ib.c=530=void rds_ib_exit(void)\n--\nnet/rds/ib.c-533-\tsynchronize_rcu();\nnet/rds/ib.c:534:\trds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);\nnet/rds/ib.c-535-#if IS_ENABLED(CONFIG_IPV6)\nnet/rds/ib.c:536:\trds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);\nnet/rds/ib.c-537-#endif\n--\nnet/rds/info.c=87=EXPORT_SYMBOL_GPL(rds_info_register_func);\nnet/rds/info.c-88-\nnet/rds/info.c:89:void rds_info_deregister_func(int optname, rds_info_func func)\nnet/rds/info.c-90-{\n--\nnet/rds/info.c-100-}\nnet/rds/info.c:101:EXPORT_SYMBOL_GPL(rds_info_deregister_func);\nnet/rds/info.c-102-\n--\nnet/rds/info.h=22=void rds_info_register_func(int optname, rds_info_func func);\nnet/rds/info.h:23:void rds_info_deregister_func(int optname, rds_info_func func);\nnet/rds/info.h-24-int rds_info_getsockopt(struct socket *sock, int optname, sockopt_t *opt);\n--\nnet/rds/stats.c=146=void rds_stats_exit(void)\nnet/rds/stats.c-147-{\nnet/rds/stats.c:148:\trds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);\nnet/rds/stats.c-149-}\n--\nnet/rds/tcp.c=747=static void rds_tcp_exit(void)\n--\nnet/rds/tcp.c-750-\tsynchronize_rcu();\nnet/rds/tcp.c:751:\trds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);\nnet/rds/tcp.c-752-#if IS_ENABLED(CONFIG_IPV6)\nnet/rds/tcp.c:753:\trds_info_deregister_func(RDS6_INFO_TCP_SOCKETS, rds6_tcp_tc_info);\nnet/rds/tcp.c-754-#endif\n"
}

gemini-3.1-pro-preview

null

null

							input: 7467
							output: 100
							thoughts: 142
						

**Analyzing Potential Fuzzing Targets in the RDS Kernel Module**

Okay, so I'm looking at this `rds_info_deregister_func` and it seems like it's only called during module exit. Now, module unloading, that's not something we typically see during a fuzzing campaign unless we've specifically set it up that way. Which makes me think that the race condition we might be chasing here is going to be incredibly difficult to trigger just through standard fuzzing. The likelihood is low.

But then there's `rds_info_getsockopt`. Now *that's* reachable, and I see it's been updated to use SRCU. That's a functional change, a core RDS logic change. Absolutely worth investigating. Definitely going to be on the fuzzing list.

Let me take a look at the relationship of `rds_info_getsockopt` with `rds_getsockopt` to start. Time to dive in.

{
  "EnableConfigs": [
    "RDS",
    "RDS_TCP"
  ],
  "FocusSymbols": [
    "rds_info_getsockopt",
    "rds_getsockopt"
  ],
  "Reasoning": "The patch modifies the RDS getsockopt implementation to use SRCU for protecting the rds_info_funcs array, fixing a race condition with module unloading. This is a functional change in reachable core kernel logic.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "RDS",
    "RDS_TCP"
  ],
  "FocusSymbols": [
    "rds_info_getsockopt",
    "rds_getsockopt"
  ],
  "Reasoning": "The patch modifies the RDS getsockopt implementation to use SRCU for protecting the rds_info_funcs array, fixing a race condition with module unloading. This is a functional change in reachable core kernel logic.",
  "WorthFuzzing": true
}