AI Trajectory

null

{
  "EnableConfigs": [
    "INET_PSP",
    "TLS",
    "NETDEVSIM"
  ],
  "FocusSymbols": [
    "sk_has_decrypt_user",
    "tcp_set_ulp",
    "psp_sock_assoc_set_rx",
    "psp_nl_rx_assoc_doit"
  ],
  "KMSANReasoning": "The patch introduces `sk_has_decrypt_user()` to enforce mutual exclusion between PSP (PSP association) and TCP ULP (such as kTLS), preventing both decryption offload/handling mechanisms from being configured on the same socket concurrently.\n\nThe changes only add conditional checks reading already initialized socket state pointers (`sk-\u003epsp_assoc` and `icsk-\u003eicsk_ulp_ops`) and returning `-EINVAL` when incompatible states are detected. There are no memory allocations, uninitialized variable accesses, data length/offset calculations, or copies to user space introduced or modified by this patch. Therefore, no uninitialized memory risks are present, and a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch introduces mutual exclusion between TCP Upper Layer Protocols (such as kTLS) and PSP (PSP Security Protocol) socket associations by adding sk_has_decrypt_user() and enforcing checks in __tcp_set_ulp() and psp_sock_assoc_set_rx(). This modifies reachable core networking and socket state management logic testable via setsockopt(TCP_ULP) and PSP netlink commands (emulated via netdevsim).",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 2187e3aa158434c2ad583bf577a35cf4f9083f2a\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Sep 17 11:13:46 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/net/sock.h b/include/net/sock.h\nindex 51185222aac29..60ea55dc18854 100644\n--- a/include/net/sock.h\n+++ b/include/net/sock.h\n@@ -2312,6 +2312,8 @@ static inline void sk_gso_disable(struct sock *sk)\n \tsk-\u003esk_route_caps \u0026= ~NETIF_F_GSO_MASK;\n }\n \n+bool sk_has_decrypt_user(const struct sock *sk);\n+\n static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,\n \t\t\t\t\t   struct iov_iter *from, char *to,\n \t\t\t\t\t   int copy, int offset)\ndiff --git a/net/core/sock.c b/net/core/sock.c\nindex fa60b7494c586..9489d9c479493 100644\n--- a/net/core/sock.c\n+++ b/net/core/sock.c\n@@ -142,6 +142,7 @@\n \n #include \u003ctrace/events/sock.h\u003e\n \n+#include \u003cnet/psp.h\u003e\n #include \u003cnet/tcp.h\u003e\n #include \u003cnet/busy_poll.h\u003e\n #include \u003cnet/phonet/phonet.h\u003e\n@@ -2670,6 +2671,12 @@ void sk_setup_caps(struct sock *sk, struct dst_entry *dst)\n }\n EXPORT_SYMBOL_GPL(sk_setup_caps);\n \n+bool sk_has_decrypt_user(const struct sock *sk)\n+{\n+\treturn psp_sk_assoc(sk) ||\n+\t       (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)); /* for tls */\n+}\n+\n /*\n  *\tSimple resource managers for sockets.\n  */\ndiff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c\nindex 2aa442128630e..b58045df101e5 100644\n--- a/net/ipv4/tcp_ulp.c\n+++ b/net/ipv4/tcp_ulp.c\n@@ -136,6 +136,10 @@ static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)\n \tif (icsk-\u003eicsk_ulp_ops)\n \t\tgoto out_err;\n \n+\terr = -EINVAL;\n+\tif (sk_has_decrypt_user(sk))\n+\t\tgoto out_err;\n+\n \tif (sk-\u003esk_socket)\n \t\tclear_bit(SOCK_SUPPORT_ZC, \u0026sk-\u003esk_socket-\u003eflags);\n \ndiff --git a/net/psp/psp_sock.c b/net/psp/psp_sock.c\nindex 1a2a6b7516b0f..e9b53eedf8dba 100644\n--- a/net/psp/psp_sock.c\n+++ b/net/psp/psp_sock.c\n@@ -143,6 +143,10 @@ int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n \t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n \t\terr = -EBUSY;\n \t\tgoto exit_unlock;\n+\t} else if (sk_has_decrypt_user(sk)) {\n+\t\tNL_SET_ERR_MSG(extack, \"Socket has incompatible state\");\n+\t\terr = -EINVAL;\n+\t\tgoto exit_unlock;\n \t}\n \n \trefcount_inc(\u0026pas-\u003erefcnt);\ndiff --git a/tools/testing/selftests/drivers/net/config b/tools/testing/selftests/drivers/net/config\nindex b6989c7d3d9d1..4838adf27fa1b 100644\n--- a/tools/testing/selftests/drivers/net/config\n+++ b/tools/testing/selftests/drivers/net/config\n@@ -21,5 +21,6 @@ CONFIG_NET_SCH_INGRESS=y\n CONFIG_NET_SCH_PRIO=m\n CONFIG_PPP=y\n CONFIG_PPPOE=y\n+CONFIG_TLS=y\n CONFIG_VLAN_8021Q=m\n CONFIG_XDP_SOCKETS=y\ndiff --git a/tools/testing/selftests/drivers/net/psp.py b/tools/testing/selftests/drivers/net/psp.py\nindex 315648a770d00..a5b1e14f120f0 100755\n--- a/tools/testing/selftests/drivers/net/psp.py\n+++ b/tools/testing/selftests/drivers/net/psp.py\n@@ -23,6 +23,8 @@ from lib.py import NetNSEnter\n from lib.py import bkg, rand_port, wait_port_listen\n from lib.py import ip\n \n+TCP_ULP = 31\n+\n \n def _get_outq(s):\n     one = b'\\0' * 4\n@@ -333,6 +335,50 @@ def assoc_version_mismatch(cfg):\n             ksft_eq(the_exception.nl_msg.error, -errno.EINVAL)\n \n \n+def _require_tls_ulp():\n+    with socket.create_server((\"localhost\", 0)) as srv, \\\n+         socket.create_connection(srv.getsockname()) as s:\n+        try:\n+            s.setsockopt(socket.SOL_TCP, TCP_ULP, b\"tls\")\n+        except OSError as exc:\n+            raise KsftSkipEx(\"kTLS not available\") from exc\n+\n+\n+def assoc_psp_ulp_exclusive(cfg):\n+    \"\"\" Test that a TCP ULP cannot be attached to a PSP socket \"\"\"\n+    _init_psp_dev(cfg)\n+    _require_tls_ulp()\n+\n+    with _make_clr_conn(cfg) as s:\n+        try:\n+            cfg.pspnl.rx_assoc({\"version\": 0,\n+                                \"dev-id\": cfg.psp_dev_id,\n+                                \"sock-fd\": s.fileno()})\n+            with ksft_raises(OSError) as cm:\n+                s.setsockopt(socket.SOL_TCP, TCP_ULP, b\"tls\")\n+            ksft_eq(cm.exception.errno, errno.EINVAL)\n+        finally:\n+            _close_conn(cfg, s)\n+\n+\n+def assoc_ulp_psp_exclusive(cfg):\n+    \"\"\" Test that a PSP assoc cannot be added to a socket with a TCP ULP \"\"\"\n+    _init_psp_dev(cfg)\n+    _require_tls_ulp()\n+\n+    with _make_clr_conn(cfg) as s:\n+        try:\n+            s.setsockopt(socket.SOL_TCP, TCP_ULP, b\"tls\")\n+            with ksft_raises(NlError) as cm:\n+                cfg.pspnl.rx_assoc({\"version\": 0,\n+                                    \"dev-id\": cfg.psp_dev_id,\n+                                    \"sock-fd\": s.fileno()})\n+            ksft_eq(cm.exception.nl_msg.error, -errno.EINVAL)\n+            ksft_eq(cm.exception.nl_msg.extack['bad-attr'], \".sock-fd\")\n+        finally:\n+            _close_conn(cfg, s)\n+\n+\n def assoc_twice(cfg):\n     \"\"\" Test reusing Tx assoc for two sockets \"\"\"\n     _init_psp_dev(cfg)\n"
}

core

null

{
  "EnableConfigs": [
    "INET_PSP",
    "TLS",
    "NETDEVSIM"
  ],
  "FocusSymbols": [
    "sk_has_decrypt_user",
    "tcp_set_ulp",
    "psp_sock_assoc_set_rx",
    "psp_nl_rx_assoc_doit"
  ],
  "Reasoning": "The patch introduces mutual exclusion between TCP Upper Layer Protocols (such as kTLS) and PSP (PSP Security Protocol) socket associations by adding sk_has_decrypt_user() and enforcing checks in __tcp_set_ulp() and psp_sock_assoc_set_rx(). This modifies reachable core networking and socket state management logic testable via setsockopt(TCP_ULP) and PSP netlink commands (emulated via netdevsim).",
  "WorthFuzzing": true
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 2187e3aa158434c2ad583bf577a35cf4f9083f2a
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Sep 17 11:13:46 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/net/sock.h b/include/net/sock.h
index 51185222aac29..60ea55dc18854 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2312,6 +2312,8 @@ static inline void sk_gso_disable(struct sock *sk)
 	sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
 }
 
+bool sk_has_decrypt_user(const struct sock *sk);
+
 static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
 					   struct iov_iter *from, char *to,
 					   int copy, int offset)
diff --git a/net/core/sock.c b/net/core/sock.c
index fa60b7494c586..9489d9c479493 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -142,6 +142,7 @@
 
 #include <trace/events/sock.h>
 
+#include <net/psp.h>
 #include <net/tcp.h>
 #include <net/busy_poll.h>
 #include <net/phonet/phonet.h>
@@ -2670,6 +2671,12 @@ void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
 }
 EXPORT_SYMBOL_GPL(sk_setup_caps);
 
+bool sk_has_decrypt_user(const struct sock *sk)
+{
+	return psp_sk_assoc(sk) ||
+	       (sk_is_inet(sk) && inet_csk_has_ulp(sk)); /* for tls */
+}
+
 /*
  *	Simple resource managers for sockets.
  */
diff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c
index 2aa442128630e..b58045df101e5 100644
--- a/net/ipv4/tcp_ulp.c
+++ b/net/ipv4/tcp_ulp.c
@@ -136,6 +136,10 @@ static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)
 	if (icsk->icsk_ulp_ops)
 		goto out_err;
 
+	err = -EINVAL;
+	if (sk_has_decrypt_user(sk))
+		goto out_err;
+
 	if (sk->sk_socket)
 		clear_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
 
diff --git a/net/psp/psp_sock.c b/net/psp/psp_sock.c
index 1a2a6b7516b0f..e9b53eedf8dba 100644
--- a/net/psp/psp_sock.c
+++ b/net/psp/psp_sock.c
@@ -143,6 +143,10 @@ int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,
 		NL_SET_ERR_MSG(extack, "Socket already has PSP state");
 		err = -EBUSY;
 		goto exit_unlock;
+	} else if (sk_has_decrypt_user(sk)) {
+		NL_SET_ERR_MSG(extack, "Socket has incompatible state");
+		err = -EINVAL;
+		goto exit_unlock;
 	}
 
 	refcount_inc(&pas->refcnt);
diff --git a/tools/testing/selftests/drivers/net/config b/tools/testing/selftests/drivers/net/config
index b6989c7d3d9d1..4838adf27fa1b 100644
--- a/tools/testing/selftests/drivers/net/config
+++ b/tools/testing/selftests/drivers/net/config
@@ -21,5 +21,6 @@ CONFIG_NET_SCH_INGRESS=y
 CONFIG_NET_SCH_PRIO=m
 CONFIG_PPP=y
 CONFIG_PPPOE=y
+CONFIG_TLS=y
 CONFIG_VLAN_8021Q=m
 CONFIG_XDP_SOCKETS=y
diff --git a/tools/testing/selftests/drivers/net/psp.py b/tools/testing/selftests/drivers/net/psp.py
index 315648a770d00..a5b1e14f120f0 100755
--- a/tools/testing/selftests/drivers/net/psp.py
+++ b/tools/testing/selftests/drivers/net/psp.py
@@ -23,6 +23,8 @@ from lib.py import NetNSEnter
 from lib.py import bkg, rand_port, wait_port_listen
 from lib.py import ip
 
+TCP_ULP = 31
+
 
 def _get_outq(s):
     one = b'\0' * 4
@@ -333,6 +335,50 @@ def assoc_version_mismatch(cfg):
             ksft_eq(the_exception.nl_msg.error, -errno.EINVAL)
 
 
+def _require_tls_ulp():
+    with socket.create_server(("localhost", 0)) as srv, \
+         socket.create_connection(srv.getsockname()) as s:
+        try:
+            s.setsockopt(socket.SOL_TCP, TCP_ULP, b"tls")
+        except OSError as exc:
+            raise KsftSkipEx("kTLS not available") from exc
+
+
+def assoc_psp_ulp_exclusive(cfg):
+    """ Test that a TCP ULP cannot be attached to a PSP socket """
+    _init_psp_dev(cfg)
+    _require_tls_ulp()
+
+    with _make_clr_conn(cfg) as s:
+        try:
+            cfg.pspnl.rx_assoc({"version": 0,
+                                "dev-id": cfg.psp_dev_id,
+                                "sock-fd": s.fileno()})
+            with ksft_raises(OSError) as cm:
+                s.setsockopt(socket.SOL_TCP, TCP_ULP, b"tls")
+            ksft_eq(cm.exception.errno, errno.EINVAL)
+        finally:
+            _close_conn(cfg, s)
+
+
+def assoc_ulp_psp_exclusive(cfg):
+    """ Test that a PSP assoc cannot be added to a socket with a TCP ULP """
+    _init_psp_dev(cfg)
+    _require_tls_ulp()
+
+    with _make_clr_conn(cfg) as s:
+        try:
+            s.setsockopt(socket.SOL_TCP, TCP_ULP, b"tls")
+            with ksft_raises(NlError) as cm:
+                cfg.pspnl.rx_assoc({"version": 0,
+                                    "dev-id": cfg.psp_dev_id,
+                                    "sock-fd": s.fileno()})
+            ksft_eq(cm.exception.nl_msg.error, -errno.EINVAL)
+            ksft_eq(cm.exception.nl_msg.extack['bad-attr'], ".sock-fd")
+        finally:
+            _close_conn(cfg, s)
+
+
 def assoc_twice(cfg):
     """ Test reusing Tx assoc for two sockets """
     _init_psp_dev(cfg)

gemini-3.8-flash

null

null

							input: 4636
							output: 25
							thoughts: 205
						

**Analyzing This Patch: A Quick Deep Dive**

Okay, let's get right into this patch. My initial thought is to quickly understand the scope of these changes. I see modifications across the networking stack, specifically dealing with the `sock` structure and potentially some offload functionality. It's touching `include/net/sock.h`, so it's defining a new function, `sk_has_decrypt_user`, and implementing it in `net/core/sock.c`. That's standard practice, nothing alarming there.

Now, the interesting bits. It seems like we're integrating this decryption check within the TCP User-Level Protocol (ULP) setup in `net/ipv4/tcp_ulp.c`, indicating some conditional behavior during TCP ULP configuration. The check is also in `net/psp/psp_sock.c`. That's where it gets more interesting. This means there's a link to PSP, so I need to quickly recall my knowledge on that area. I know PSP refers to either "PSP Security Protocol" or "PSP Encryption Offload" or maybe "PSP Networking". Given the context of a decryption check, I suspect we're dealing with the latter and need to explore it further.

The `tools/testing/selftests/...` inclusion suggests this functionality is being rigorously tested, which is good.

I need to quickly locate the `net/psp/` directory in the kernel source. Now, it's time to check which configuration options control its inclusion, so I know whether or not this change will affect the systems I am responsible for.

{
  "Expression": "PSP",
  "PathPrefix": "net/psp/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 621 lines.\nUse more precise expression if possible.\n\nnet/psp/Kconfig-2-#\nnet/psp/Kconfig:3:# PSP configuration\nnet/psp/Kconfig-4-#\nnet/psp/Kconfig:5:config INET_PSP\nnet/psp/Kconfig:6:\tbool \"PSP Security Protocol support\"\nnet/psp/Kconfig-7-\tdepends on INET\n--\nnet/psp/Kconfig-11-\thelp\nnet/psp/Kconfig:12:\tEnable kernel support for the PSP Security Protocol (PSP).\nnet/psp/Kconfig-13-\tFor more information see:\nnet/psp/Kconfig:14:\t  https://raw.githubusercontent.com/google/psp/main/doc/PSP_Arch_Spec.pdf\nnet/psp/Kconfig-15-\n--\nnet/psp/Makefile-2-\nnet/psp/Makefile:3:obj-$(CONFIG_INET_PSP) += psp.o\nnet/psp/Makefile-4-\n--\nnet/psp/psp-nl-gen.c-14-/* Common nested types */\nnet/psp/psp-nl-gen.c:15:const struct nla_policy psp_keys_nl_policy[PSP_A_KEYS_SPI + 1] = {\nnet/psp/psp-nl-gen.c:16:\t[PSP_A_KEYS_KEY] = { .type = NLA_BINARY, },\nnet/psp/psp-nl-gen.c:17:\t[PSP_A_KEYS_SPI] = { .type = NLA_U32, },\nnet/psp/psp-nl-gen.c-18-};\nnet/psp/psp-nl-gen.c-19-\nnet/psp/psp-nl-gen.c:20:/* PSP_CMD_DEV_GET - do */\nnet/psp/psp-nl-gen.c:21:static const struct nla_policy psp_dev_get_nl_policy[PSP_A_DEV_ID + 1] = {\nnet/psp/psp-nl-gen.c:22:\t[PSP_A_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c-23-};\nnet/psp/psp-nl-gen.c-24-\nnet/psp/psp-nl-gen.c:25:/* PSP_CMD_DEV_SET - do */\nnet/psp/psp-nl-gen.c:26:static const struct nla_policy psp_dev_set_nl_policy[PSP_A_DEV_PSP_VERSIONS_ENA + 1] = {\nnet/psp/psp-nl-gen.c:27:\t[PSP_A_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c:28:\t[PSP_A_DEV_PSP_VERSIONS_ENA] = NLA_POLICY_MASK(NLA_U32, 0xf),\nnet/psp/psp-nl-gen.c-29-};\nnet/psp/psp-nl-gen.c-30-\nnet/psp/psp-nl-gen.c:31:/* PSP_CMD_KEY_ROTATE - do */\nnet/psp/psp-nl-gen.c:32:static const struct nla_policy psp_key_rotate_nl_policy[PSP_A_DEV_ID + 1] = {\nnet/psp/psp-nl-gen.c:33:\t[PSP_A_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c-34-};\nnet/psp/psp-nl-gen.c-35-\nnet/psp/psp-nl-gen.c:36:/* PSP_CMD_RX_ASSOC - do */\nnet/psp/psp-nl-gen.c:37:static const struct nla_policy psp_rx_assoc_nl_policy[PSP_A_ASSOC_SOCK_FD + 1] = {\nnet/psp/psp-nl-gen.c:38:\t[PSP_A_ASSOC_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c:39:\t[PSP_A_ASSOC_VERSION] = NLA_POLICY_MAX(NLA_U32, 3),\nnet/psp/psp-nl-gen.c:40:\t[PSP_A_ASSOC_SOCK_FD] = { .type = NLA_U32, },\nnet/psp/psp-nl-gen.c-41-};\nnet/psp/psp-nl-gen.c-42-\nnet/psp/psp-nl-gen.c:43:/* PSP_CMD_TX_ASSOC - do */\nnet/psp/psp-nl-gen.c:44:static const struct nla_policy psp_tx_assoc_nl_policy[PSP_A_ASSOC_SOCK_FD + 1] = {\nnet/psp/psp-nl-gen.c:45:\t[PSP_A_ASSOC_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c:46:\t[PSP_A_ASSOC_VERSION] = NLA_POLICY_MAX(NLA_U32, 3),\nnet/psp/psp-nl-gen.c:47:\t[PSP_A_ASSOC_TX_KEY] = NLA_POLICY_NESTED(psp_keys_nl_policy),\nnet/psp/psp-nl-gen.c:48:\t[PSP_A_ASSOC_SOCK_FD] = { .type = NLA_U32, },\nnet/psp/psp-nl-gen.c-49-};\nnet/psp/psp-nl-gen.c-50-\nnet/psp/psp-nl-gen.c:51:/* PSP_CMD_GET_STATS - do */\nnet/psp/psp-nl-gen.c:52:static const struct nla_policy psp_get_stats_nl_policy[PSP_A_STATS_DEV_ID + 1] = {\nnet/psp/psp-nl-gen.c:53:\t[PSP_A_STATS_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c-54-};\nnet/psp/psp-nl-gen.c-55-\nnet/psp/psp-nl-gen.c:56:/* PSP_CMD_DEV_ASSOC - do */\nnet/psp/psp-nl-gen.c:57:static const struct nla_policy psp_dev_assoc_nl_policy[PSP_A_DEV_NSID + 1] = {\nnet/psp/psp-nl-gen.c:58:\t[PSP_A_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c:59:\t[PSP_A_DEV_IFINDEX] = { .type = NLA_U32, },\nnet/psp/psp-nl-gen.c:60:\t[PSP_A_DEV_NSID] = { .type = NLA_S32, },\nnet/psp/psp-nl-gen.c-61-};\nnet/psp/psp-nl-gen.c-62-\nnet/psp/psp-nl-gen.c:63:/* PSP_CMD_DEV_DISASSOC - do */\nnet/psp/psp-nl-gen.c:64:static const struct nla_policy psp_dev_disassoc_nl_policy[PSP_A_DEV_NSID + 1] = {\nnet/psp/psp-nl-gen.c:65:\t[PSP_A_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\nnet/psp/psp-nl-gen.c:66:\t[PSP_A_DEV_IFINDEX] = { .type = NLA_U32, },\nnet/psp/psp-nl-gen.c:67:\t[PSP_A_DEV_NSID] = { .type = NLA_S32, },\nnet/psp/psp-nl-gen.c-68-};\n--\nnet/psp/psp-nl-gen.c=71=static const struct genl_split_ops psp_nl_ops[] = {\nnet/psp/psp-nl-gen.c-72-\t{\nnet/psp/psp-nl-gen.c:73:\t\t.cmd\t\t= PSP_CMD_DEV_GET,\nnet/psp/psp-nl-gen.c-74-\t\t.pre_doit\t= psp_device_get_locked,\n--\nnet/psp/psp-nl-gen.c-77-\t\t.policy\t\t= psp_dev_get_nl_policy,\nnet/psp/psp-nl-gen.c:78:\t\t.maxattr\t= PSP_A_DEV_ID,\nnet/psp/psp-nl-gen.c-79-\t\t.flags\t\t= GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-81-\t{\nnet/psp/psp-nl-gen.c:82:\t\t.cmd\t= PSP_CMD_DEV_GET,\nnet/psp/psp-nl-gen.c-83-\t\t.dumpit\t= psp_nl_dev_get_dumpit,\n--\nnet/psp/psp-nl-gen.c-86-\t{\nnet/psp/psp-nl-gen.c:87:\t\t.cmd\t\t= PSP_CMD_DEV_SET,\nnet/psp/psp-nl-gen.c-88-\t\t.pre_doit\t= psp_device_get_locked_admin,\n--\nnet/psp/psp-nl-gen.c-91-\t\t.policy\t\t= psp_dev_set_nl_policy,\nnet/psp/psp-nl-gen.c:92:\t\t.maxattr\t= PSP_A_DEV_PSP_VERSIONS_ENA,\nnet/psp/psp-nl-gen.c-93-\t\t.flags\t\t= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-95-\t{\nnet/psp/psp-nl-gen.c:96:\t\t.cmd\t\t= PSP_CMD_KEY_ROTATE,\nnet/psp/psp-nl-gen.c-97-\t\t.pre_doit\t= psp_device_get_locked_admin,\n--\nnet/psp/psp-nl-gen.c-100-\t\t.policy\t\t= psp_key_rotate_nl_policy,\nnet/psp/psp-nl-gen.c:101:\t\t.maxattr\t= PSP_A_DEV_ID,\nnet/psp/psp-nl-gen.c-102-\t\t.flags\t\t= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-104-\t{\nnet/psp/psp-nl-gen.c:105:\t\t.cmd\t\t= PSP_CMD_RX_ASSOC,\nnet/psp/psp-nl-gen.c-106-\t\t.pre_doit\t= psp_assoc_device_get_locked,\n--\nnet/psp/psp-nl-gen.c-109-\t\t.policy\t\t= psp_rx_assoc_nl_policy,\nnet/psp/psp-nl-gen.c:110:\t\t.maxattr\t= PSP_A_ASSOC_SOCK_FD,\nnet/psp/psp-nl-gen.c-111-\t\t.flags\t\t= GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-113-\t{\nnet/psp/psp-nl-gen.c:114:\t\t.cmd\t\t= PSP_CMD_TX_ASSOC,\nnet/psp/psp-nl-gen.c-115-\t\t.pre_doit\t= psp_assoc_device_get_locked,\n--\nnet/psp/psp-nl-gen.c-118-\t\t.policy\t\t= psp_tx_assoc_nl_policy,\nnet/psp/psp-nl-gen.c:119:\t\t.maxattr\t= PSP_A_ASSOC_SOCK_FD,\nnet/psp/psp-nl-gen.c-120-\t\t.flags\t\t= GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-122-\t{\nnet/psp/psp-nl-gen.c:123:\t\t.cmd\t\t= PSP_CMD_GET_STATS,\nnet/psp/psp-nl-gen.c-124-\t\t.pre_doit\t= psp_device_get_locked,\n--\nnet/psp/psp-nl-gen.c-127-\t\t.policy\t\t= psp_get_stats_nl_policy,\nnet/psp/psp-nl-gen.c:128:\t\t.maxattr\t= PSP_A_STATS_DEV_ID,\nnet/psp/psp-nl-gen.c-129-\t\t.flags\t\t= GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-131-\t{\nnet/psp/psp-nl-gen.c:132:\t\t.cmd\t= PSP_CMD_GET_STATS,\nnet/psp/psp-nl-gen.c-133-\t\t.dumpit\t= psp_nl_get_stats_dumpit,\n--\nnet/psp/psp-nl-gen.c-136-\t{\nnet/psp/psp-nl-gen.c:137:\t\t.cmd\t\t= PSP_CMD_DEV_ASSOC,\nnet/psp/psp-nl-gen.c-138-\t\t.pre_doit\t= psp_device_get_locked_dev_assoc,\n--\nnet/psp/psp-nl-gen.c-141-\t\t.policy\t\t= psp_dev_assoc_nl_policy,\nnet/psp/psp-nl-gen.c:142:\t\t.maxattr\t= PSP_A_DEV_NSID,\nnet/psp/psp-nl-gen.c-143-\t\t.flags\t\t= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c-145-\t{\nnet/psp/psp-nl-gen.c:146:\t\t.cmd\t\t= PSP_CMD_DEV_DISASSOC,\nnet/psp/psp-nl-gen.c-147-\t\t.pre_doit\t= psp_device_get_locked,\n--\nnet/psp/psp-nl-gen.c-150-\t\t.policy\t\t= psp_dev_disassoc_nl_policy,\nnet/psp/psp-nl-gen.c:151:\t\t.maxattr\t= PSP_A_DEV_NSID,\nnet/psp/psp-nl-gen.c-152-\t\t.flags\t\t= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,\n--\nnet/psp/psp-nl-gen.c=156=static const struct genl_multicast_group psp_nl_mcgrps[] = {\nnet/psp/psp-nl-gen.c:157:\t[PSP_NLGRP_MGMT] = { \"mgmt\", },\nnet/psp/psp-nl-gen.c:158:\t[PSP_NLGRP_USE] = { \"use\", },\nnet/psp/psp-nl-gen.c-159-};\n--\nnet/psp/psp-nl-gen.c=161=struct genl_family psp_nl_family __ro_after_init = {\nnet/psp/psp-nl-gen.c:162:\t.name\t\t= PSP_FAMILY_NAME,\nnet/psp/psp-nl-gen.c:163:\t.version\t= PSP_FAMILY_VERSION,\nnet/psp/psp-nl-gen.c-164-\t.netnsok\t= true,\n--\nnet/psp/psp-nl-gen.h-6-\nnet/psp/psp-nl-gen.h:7:#ifndef _LINUX_PSP_GEN_H\nnet/psp/psp-nl-gen.h:8:#define _LINUX_PSP_GEN_H\nnet/psp/psp-nl-gen.h-9-\n--\nnet/psp/psp-nl-gen.h-15-/* Common nested types */\nnet/psp/psp-nl-gen.h:16:extern const struct nla_policy psp_keys_nl_policy[PSP_A_KEYS_SPI + 1];\nnet/psp/psp-nl-gen.h-17-\n--\nnet/psp/psp-nl-gen.h=42=enum {\nnet/psp/psp-nl-gen.h:43:\tPSP_NLGRP_MGMT,\nnet/psp/psp-nl-gen.h:44:\tPSP_NLGRP_USE,\nnet/psp/psp-nl-gen.h-45-};\n--\nnet/psp/psp-nl-gen.h=47=extern struct genl_family psp_nl_family;\nnet/psp/psp-nl-gen.h-48-\nnet/psp/psp-nl-gen.h:49:#endif /* _LINUX_PSP_GEN_H */\n--\nnet/psp/psp.h-2-\nnet/psp/psp.h:3:#ifndef __PSP_PSP_H\nnet/psp/psp.h:4:#define __PSP_PSP_H\nnet/psp/psp.h-5-\n--\nnet/psp/psp.h=50=static inline bool psp_dev_is_registered(struct psp_dev *psd)\n--\nnet/psp/psp.h-55-\nnet/psp/psp.h:56:#endif /* __PSP_PSP_H */\n--\nnet/psp/psp_main.c=15=struct mutex psp_devs_lock;\n--\nnet/psp/psp_main.c-17-/**\nnet/psp/psp_main.c:18: * DOC: PSP locking\nnet/psp/psp_main.c-19- *\n--\nnet/psp/psp_main.c-26-/**\nnet/psp/psp_main.c:27: * psp_dev_check_access() - check if user in a given net ns can access PSP dev\nnet/psp/psp_main.c:28: * @psd:\tPSP device structure user is trying to access\nnet/psp/psp_main.c-29- * @net:\tnet namespace user is in\n--\nnet/psp/psp_main.c-35- *\nnet/psp/psp_main.c:36: * Return: 0 if PSP device should be visible in @net, errno otherwise.\nnet/psp/psp_main.c-37- */\nnet/psp/psp_main.c=38=int psp_dev_check_access(struct psp_dev *psd, struct net *net, bool admin)\n--\nnet/psp/psp_main.c-49-/**\nnet/psp/psp_main.c:50: * psp_dev_create() - create and register PSP device\nnet/psp/psp_main.c-51- * @netdev:\tmain netdevice\n--\nnet/psp/psp_main.c-55- *\nnet/psp/psp_main.c:56: * Return: pointer to allocated PSP device, or ERR_PTR.\nnet/psp/psp_main.c-57- */\n--\nnet/psp/psp_main.c=59=psp_dev_create(struct net_device *netdev,\n--\nnet/psp/psp_main.c-104-\t * There's no strong reason for it, but thinking is to avoid creating\nnet/psp/psp_main.c:105:\t * implicit expectations about the PSP dev \u003c\u003e netdev relationship.\nnet/psp/psp_main.c-106-\t */\nnet/psp/psp_main.c:107:\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_ADD_NTF);\nnet/psp/psp_main.c-108-\n--\nnet/psp/psp_main.c=117=void psp_dev_free(struct psp_dev *psd)\n--\nnet/psp/psp_main.c-127-/**\nnet/psp/psp_main.c:128: * psp_dev_unregister() - unregister PSP device\nnet/psp/psp_main.c:129: * @psd:\tPSP device structure\nnet/psp/psp_main.c-130- */\nnet/psp/psp_main.c=131=void psp_dev_unregister(struct psp_dev *psd)\n--\nnet/psp/psp_main.c-138-\nnet/psp/psp_main.c:139:\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_DEL_NTF);\nnet/psp/psp_main.c-140-\n--\nnet/psp/psp_main.c=173=unsigned int psp_key_size(u32 version)\n--\nnet/psp/psp_main.c-175-\tswitch (version) {\nnet/psp/psp_main.c:176:\tcase PSP_VERSION_HDR0_AES_GCM_128:\nnet/psp/psp_main.c:177:\tcase PSP_VERSION_HDR0_AES_GMAC_128:\nnet/psp/psp_main.c-178-\t\treturn 16;\nnet/psp/psp_main.c:179:\tcase PSP_VERSION_HDR0_AES_GCM_256:\nnet/psp/psp_main.c:180:\tcase PSP_VERSION_HDR0_AES_GMAC_256:\nnet/psp/psp_main.c-181-\t\treturn 32;\n--\nnet/psp/psp_main.c=188=static void psp_write_headers(struct net *net, struct sk_buff *skb, __be32 spi,\n--\nnet/psp/psp_main.c-194-\nnet/psp/psp_main.c:195:\tuh-\u003edest = htons(PSP_DEFAULT_UDP_PORT);\nnet/psp/psp_main.c-196-\n--\nnet/psp/psp_main.c-236-\tpsph-\u003enexthdr = IPPROTO_TCP;\nnet/psp/psp_main.c:237:\tpsph-\u003ehdrlen = PSP_HDRLEN_NOOPT;\nnet/psp/psp_main.c-238-\tpsph-\u003ecrypt_offset = 0;\nnet/psp/psp_main.c:239:\tpsph-\u003everfl = FIELD_PREP(PSPHDR_VERFL_VERSION, ver) |\nnet/psp/psp_main.c:240:\t\t      FIELD_PREP(PSPHDR_VERFL_ONE, 1);\nnet/psp/psp_main.c-241-\tpsph-\u003espi = spi;\n--\nnet/psp/psp_main.c-244-\nnet/psp/psp_main.c:245:/* Encapsulate a TCP packet with PSP by adding the UDP+PSP headers and filling\nnet/psp/psp_main.c-246- * them in.\n--\nnet/psp/psp_main.c=248=bool psp_dev_encapsulate(struct net *net, struct sk_buff *skb, __be32 spi,\n--\nnet/psp/psp_main.c-258-\nnet/psp/psp_main.c:259:\tif (skb_cow_head(skb, PSP_ENCAP_HLEN))\nnet/psp/psp_main.c-260-\t\treturn false;\nnet/psp/psp_main.c-261-\nnet/psp/psp_main.c:262:\tskb_push(skb, PSP_ENCAP_HLEN);\nnet/psp/psp_main.c:263:\tskb-\u003emac_header\t\t-= PSP_ENCAP_HLEN;\nnet/psp/psp_main.c:264:\tskb-\u003enetwork_header\t-= PSP_ENCAP_HLEN;\nnet/psp/psp_main.c:265:\tskb-\u003etransport_header\t-= PSP_ENCAP_HLEN;\nnet/psp/psp_main.c:266:\tmemmove(skb-\u003edata, skb-\u003edata + PSP_ENCAP_HLEN, bufflen);\nnet/psp/psp_main.c-267-\n--\nnet/psp/psp_main.c-269-\t\tip_hdr(skb)-\u003eprotocol = IPPROTO_UDP;\nnet/psp/psp_main.c:270:\t\tbe16_add_cpu(\u0026ip_hdr(skb)-\u003etot_len, PSP_ENCAP_HLEN);\nnet/psp/psp_main.c-271-\t\tip_hdr(skb)-\u003echeck = 0;\n--\nnet/psp/psp_main.c-275-\t\tipv6_hdr(skb)-\u003enexthdr = IPPROTO_UDP;\nnet/psp/psp_main.c:276:\t\tbe16_add_cpu(\u0026ipv6_hdr(skb)-\u003epayload_len, PSP_ENCAP_HLEN);\nnet/psp/psp_main.c-277-\t}\n--\nnet/psp/psp_main.c-280-\tskb_set_inner_transport_header(skb, skb_transport_offset(skb) +\nnet/psp/psp_main.c:281:\t\t\t\t\t\t    PSP_ENCAP_HLEN);\nnet/psp/psp_main.c-282-\tskb-\u003eencapsulation = 1;\n--\nnet/psp/psp_main.c=288=EXPORT_SYMBOL(psp_dev_encapsulate);\nnet/psp/psp_main.c-289-\nnet/psp/psp_main.c:290:/* Receive handler for PSP packets.\nnet/psp/psp_main.c-291- *\nnet/psp/psp_main.c:292: * Accepts only already-authenticated packets. The full PSP header is\nnet/psp/psp_main.c-293- * stripped according to psph-\u003ehdrlen; any optional fields it advertises\n--\nnet/psp/psp_main.c=299=int psp_dev_rcv(struct sk_buff *skb, u16 dev_id, u8 generation, bool strip_icv)\n--\nnet/psp/psp_main.c-317-\nnet/psp/psp_main.c:318:\tif (unlikely(!pskb_may_pull(skb, l2_hlen + l3_hlen + PSP_ENCAP_HLEN)))\nnet/psp/psp_main.c-319-\t\treturn -EINVAL;\n--\nnet/psp/psp_main.c-329-\t\tif (l3_hlen != sizeof(struct iphdr) \u0026\u0026\nnet/psp/psp_main.c:330:\t\t    !pskb_may_pull(skb, l2_hlen + l3_hlen + PSP_ENCAP_HLEN))\nnet/psp/psp_main.c-331-\t\t\treturn -EINVAL;\n--\nnet/psp/psp_main.c-341-\tuh = (struct udphdr *)(skb-\u003edata + l2_hlen + l3_hlen);\nnet/psp/psp_main.c:342:\tif (unlikely(uh-\u003edest != htons(PSP_DEFAULT_UDP_PORT)))\nnet/psp/psp_main.c-343-\t\treturn -EINVAL;\n--\nnet/psp/psp_main.c-347-\nnet/psp/psp_main.c:348:\t/* Strip the full PSP header per psph-\u003ehdrlen; VC/options are pulled\nnet/psp/psp_main.c-349-\t * into the linear region only so they can be discarded with the\n--\nnet/psp/psp_main.c-364-\nnet/psp/psp_main.c:365:\tpse = skb_ext_add(skb, SKB_EXT_PSP);\nnet/psp/psp_main.c-366-\tif (!pse)\n--\nnet/psp/psp_main.c-371-\tpse-\u003egeneration = generation;\nnet/psp/psp_main.c:372:\tpse-\u003eversion = FIELD_GET(PSPHDR_VERFL_VERSION, psph-\u003everfl);\nnet/psp/psp_main.c-373-\nnet/psp/psp_main.c-374-\tencap = sizeof(struct udphdr) + psp_hlen;\nnet/psp/psp_main.c:375:\tencap += strip_icv ? PSP_TRL_SIZE : 0;\nnet/psp/psp_main.c-376-\n--\nnet/psp/psp_main.c-401-\tif (strip_icv)\nnet/psp/psp_main.c:402:\t\tpskb_trim(skb, skb-\u003elen - PSP_TRL_SIZE);\nnet/psp/psp_main.c-403-\n--\nnet/psp/psp_main.c=424=static int psp_netdev_event(struct notifier_block *nb, unsigned long event,\n--\nnet/psp/psp_main.c-438-\t\tif (psp_dev_is_registered(psd))\nnet/psp/psp_main.c:439:\t\t\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_CHANGE_NTF);\nnet/psp/psp_main.c-440-\t\tpsp_dev_disassoc_one(psd, dev);\n--\nnet/psp/psp_nl.c=34=static int psp_nl_reply_send(struct sk_buff *rsp, struct genl_info *info)\n--\nnet/psp/psp_nl.c-43- * psp_nl_multicast_per_ns() - multicast a notification to each unique netns\nnet/psp/psp_nl.c:44: * @psd: PSP device (must be locked)\nnet/psp/psp_nl.c-45- * @group: multicast group\n--\nnet/psp/psp_nl.c=145=static int __psp_device_get_locked(const struct genl_split_ops *ops,\n--\nnet/psp/psp_nl.c-148-{\nnet/psp/psp_nl.c:149:\tif (GENL_REQ_ATTR_CHECK(info, PSP_A_DEV_ID))\nnet/psp/psp_nl.c-150-\t\treturn -EINVAL;\n--\nnet/psp/psp_nl.c-152-\tinfo-\u003euser_ptr[0] = psp_device_get_and_lock(genl_info_net(info),\nnet/psp/psp_nl.c:153:\t\t\t\t\t\t    info-\u003eattrs[PSP_A_DEV_ID],\nnet/psp/psp_nl.c-154-\t\t\t\t\t\t    admin);\n--\nnet/psp/psp_nl.c=186=static struct net *psp_nl_resolve_assoc_dev_ns(struct psp_dev *psd,\n--\nnet/psp/psp_nl.c-191-\nnet/psp/psp_nl.c:192:\tif (GENL_REQ_ATTR_CHECK(info, PSP_A_DEV_IFINDEX))\nnet/psp/psp_nl.c-193-\t\treturn ERR_PTR(-EINVAL);\nnet/psp/psp_nl.c-194-\nnet/psp/psp_nl.c:195:\tif (info-\u003eattrs[PSP_A_DEV_NSID]) {\nnet/psp/psp_nl.c-196-\t\t/* Only callers in the main netns may specify nsid */\n--\nnet/psp/psp_nl.c-198-\t\t\tNL_SET_BAD_ATTR(info-\u003eextack,\nnet/psp/psp_nl.c:199:\t\t\t\t\tinfo-\u003eattrs[PSP_A_DEV_NSID]);\nnet/psp/psp_nl.c-200-\t\t\treturn ERR_PTR(-EPERM);\n--\nnet/psp/psp_nl.c-202-\nnet/psp/psp_nl.c:203:\t\tnsid = nla_get_s32(info-\u003eattrs[PSP_A_DEV_NSID]);\nnet/psp/psp_nl.c-204-\n--\nnet/psp/psp_nl.c-207-\t\t\tNL_SET_BAD_ATTR(info-\u003eextack,\nnet/psp/psp_nl.c:208:\t\t\t\t\tinfo-\u003eattrs[PSP_A_DEV_NSID]);\nnet/psp/psp_nl.c-209-\t\t\treturn ERR_PTR(-EINVAL);\n--\nnet/psp/psp_nl.c=242=static int psp_nl_fill_assoc_dev_list(struct psp_dev *psd, struct sk_buff *rsp,\n--\nnet/psp/psp_nl.c-264-\nnet/psp/psp_nl.c:265:\t\tnest = nla_nest_start(rsp, PSP_A_DEV_ASSOC_LIST);\nnet/psp/psp_nl.c-266-\t\tif (!nest)\n--\nnet/psp/psp_nl.c-268-\nnet/psp/psp_nl.c:269:\t\tif (nla_put_u32(rsp, PSP_A_ASSOC_DEV_INFO_IFINDEX,\nnet/psp/psp_nl.c-270-\t\t\t\tentry-\u003eassoc_dev-\u003eifindex) ||\nnet/psp/psp_nl.c:271:\t\t    nla_put_s32(rsp, PSP_A_ASSOC_DEV_INFO_NSID, nsid)) {\nnet/psp/psp_nl.c-272-\t\t\tnla_nest_cancel(rsp, nest);\n--\nnet/psp/psp_nl.c=283=psp_nl_dev_fill(struct psp_dev *psd, struct sk_buff *rsp,\n--\nnet/psp/psp_nl.c-295-\nnet/psp/psp_nl.c:296:\tif (nla_put_u32(rsp, PSP_A_DEV_ID, psd-\u003eid) ||\nnet/psp/psp_nl.c:297:\t    nla_put_u32(rsp, PSP_A_DEV_IFINDEX, psd-\u003emain_netdev-\u003eifindex) ||\nnet/psp/psp_nl.c:298:\t    nla_put_u32(rsp, PSP_A_DEV_PSP_VERSIONS_CAP, psd-\u003ecaps-\u003eversions) ||\nnet/psp/psp_nl.c:299:\t    nla_put_u32(rsp, PSP_A_DEV_PSP_VERSIONS_ENA, psd-\u003econfig.versions))\nnet/psp/psp_nl.c-300-\t\tgoto err_cancel_msg;\n--\nnet/psp/psp_nl.c-310-\t\t */\nnet/psp/psp_nl.c:311:\t\tif (nla_put_flag(rsp, PSP_A_DEV_BY_ASSOCIATION))\nnet/psp/psp_nl.c-312-\t\t\tgoto err_cancel_msg;\n--\nnet/psp/psp_nl.c=326=static struct sk_buff *psp_nl_build_dev_ntf(struct psp_dev *psd,\n--\nnet/psp/psp_nl.c-332-\nnet/psp/psp_nl.c:333:\tif (!genl_has_listeners(\u0026psp_nl_family, net, PSP_NLGRP_MGMT))\nnet/psp/psp_nl.c-334-\t\treturn NULL;\n--\nnet/psp/psp_nl.c=350=void psp_nl_notify_dev(struct psp_dev *psd, u32 cmd)\nnet/psp/psp_nl.c-351-{\nnet/psp/psp_nl.c:352:\tpsp_nl_multicast_per_ns(psd, PSP_NLGRP_MGMT,\nnet/psp/psp_nl.c-353-\t\t\t\tpsp_nl_build_dev_ntf, \u0026cmd);\n--\nnet/psp/psp_nl.c=405=int psp_nl_dev_set_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-413-\nnet/psp/psp_nl.c:414:\tif (info-\u003eattrs[PSP_A_DEV_PSP_VERSIONS_ENA]) {\nnet/psp/psp_nl.c-415-\t\tnew_config.versions =\nnet/psp/psp_nl.c:416:\t\t\tnla_get_u32(info-\u003eattrs[PSP_A_DEV_PSP_VERSIONS_ENA]);\nnet/psp/psp_nl.c-417-\t\tif (new_config.versions \u0026 ~psd-\u003ecaps-\u003eversions) {\nnet/psp/psp_nl.c:418:\t\t\tNL_SET_ERR_MSG(info-\u003eextack, \"Requested PSP versions not supported by the device\");\nnet/psp/psp_nl.c-419-\t\t\treturn -EINVAL;\n--\nnet/psp/psp_nl.c-437-\nnet/psp/psp_nl.c:438:\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_CHANGE_NTF);\nnet/psp/psp_nl.c-439-\n--\nnet/psp/psp_nl.c=447=int psp_nl_key_rotate_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-458-\nnet/psp/psp_nl.c:459:\tgenl_info_init_ntf(\u0026ntf_info, \u0026psp_nl_family, PSP_CMD_KEY_ROTATE_NTF);\nnet/psp/psp_nl.c-460-\tntf = psp_nl_reply_new(\u0026ntf_info);\n--\nnet/psp/psp_nl.c-465-\nnet/psp/psp_nl.c:466:\tif (nla_put_u32(rsp, PSP_A_DEV_ID, psd-\u003eid) ||\nnet/psp/psp_nl.c:467:\t    nla_put_u32(ntf, PSP_A_DEV_ID, psd-\u003eid)) {\nnet/psp/psp_nl.c-468-\t\terr = -EMSGSIZE;\n--\nnet/psp/psp_nl.c-473-\tprev_gen = psd-\u003egeneration;\nnet/psp/psp_nl.c:474:\tpsd-\u003egeneration = (prev_gen + 1) \u0026 PSP_GEN_VALID_MASK;\nnet/psp/psp_nl.c-475-\n--\nnet/psp/psp_nl.c-480-\tWARN_ON_ONCE((psd-\u003egeneration \u0026\u0026 psd-\u003egeneration == prev_gen) ||\nnet/psp/psp_nl.c:481:\t\t     psd-\u003egeneration \u0026 ~PSP_GEN_VALID_MASK);\nnet/psp/psp_nl.c-482-\n--\nnet/psp/psp_nl.c-487-\nnet/psp/psp_nl.c:488:\tpsp_nl_multicast_all_ns(psd, ntf, PSP_NLGRP_USE);\nnet/psp/psp_nl.c-489-\n--\nnet/psp/psp_nl.c=499=int psp_nl_dev_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-508-\nnet/psp/psp_nl.c:509:\tif (psd-\u003eassoc_dev_cnt \u003e= PSP_ASSOC_DEV_MAX) {\nnet/psp/psp_nl.c-510-\t\tNL_SET_ERR_MSG(info-\u003eextack,\n--\nnet/psp/psp_nl.c-524-\nnet/psp/psp_nl.c:525:\tassoc_ifindex = nla_get_u32(info-\u003eattrs[PSP_A_DEV_IFINDEX]);\nnet/psp/psp_nl.c-526-\tassoc_dev = netdev_get_by_index(net, assoc_ifindex,\n--\nnet/psp/psp_nl.c-529-\tif (!assoc_dev) {\nnet/psp/psp_nl.c:530:\t\tNL_SET_BAD_ATTR(info-\u003eextack, info-\u003eattrs[PSP_A_DEV_IFINDEX]);\nnet/psp/psp_nl.c-531-\t\terr = -ENODEV;\n--\nnet/psp/psp_nl.c-534-\nnet/psp/psp_nl.c:535:\t/* Check if device is already associated with a PSP device */\nnet/psp/psp_nl.c-536-\tif (unrcu_pointer(cmpxchg(\u0026assoc_dev-\u003epsp_dev, NULL,\n--\nnet/psp/psp_nl.c-538-\t\tNL_SET_ERR_MSG(info-\u003eextack,\nnet/psp/psp_nl.c:539:\t\t\t       \"Device already associated with a PSP device\");\nnet/psp/psp_nl.c-540-\t\terr = -EBUSY;\n--\nnet/psp/psp_nl.c-568-\nnet/psp/psp_nl.c:569:\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_CHANGE_NTF);\nnet/psp/psp_nl.c-570-\n--\nnet/psp/psp_nl.c=585=int psp_nl_dev_disassoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-596-\nnet/psp/psp_nl.c:597:\tassoc_ifindex = nla_get_u32(info-\u003eattrs[PSP_A_DEV_IFINDEX]);\nnet/psp/psp_nl.c-598-\n--\nnet/psp/psp_nl.c-609-\t\tput_net(net);\nnet/psp/psp_nl.c:610:\t\tNL_SET_BAD_ATTR(info-\u003eextack, info-\u003eattrs[PSP_A_DEV_IFINDEX]);\nnet/psp/psp_nl.c-611-\t\treturn -ENODEV;\n--\nnet/psp/psp_nl.c-624-\t */\nnet/psp/psp_nl.c:625:\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_CHANGE_NTF);\nnet/psp/psp_nl.c-626-\n--\nnet/psp/psp_nl.c=639=int psp_assoc_device_get_locked(const struct genl_split_ops *ops,\n--\nnet/psp/psp_nl.c-646-\nnet/psp/psp_nl.c:647:\tif (GENL_REQ_ATTR_CHECK(info, PSP_A_ASSOC_SOCK_FD))\nnet/psp/psp_nl.c-648-\t\treturn -EINVAL;\nnet/psp/psp_nl.c-649-\nnet/psp/psp_nl.c:650:\tfd = nla_get_u32(info-\u003eattrs[PSP_A_ASSOC_SOCK_FD]);\nnet/psp/psp_nl.c-651-\tsocket = sockfd_lookup(fd, \u0026err);\n--\nnet/psp/psp_nl.c-656-\t\tNL_SET_ERR_MSG_ATTR(info-\u003eextack,\nnet/psp/psp_nl.c:657:\t\t\t\t    info-\u003eattrs[PSP_A_ASSOC_SOCK_FD],\nnet/psp/psp_nl.c-658-\t\t\t\t    \"Unsupported socket family and type\");\n--\nnet/psp/psp_nl.c-676-\nnet/psp/psp_nl.c:677:\tif (!psd \u0026\u0026 GENL_REQ_ATTR_CHECK(info, PSP_A_ASSOC_DEV_ID)) {\nnet/psp/psp_nl.c-678-\t\terr = -EINVAL;\n--\nnet/psp/psp_nl.c-681-\nnet/psp/psp_nl.c:682:\tid = info-\u003eattrs[PSP_A_ASSOC_DEV_ID];\nnet/psp/psp_nl.c-683-\tif (psd) {\n--\nnet/psp/psp_nl.c=714=psp_nl_parse_key(struct genl_info *info, u32 attr, struct psp_key_parsed *key,\n--\nnet/psp/psp_nl.c-717-\tstruct nlattr *nest = info-\u003eattrs[attr];\n\n"
}

gemini-3.8-flash

null

null

							input: 16502
							output: 36
							thoughts: 34
						

**Diving into the Net/Core Socket Logic**

Alright, let's get down to brass tacks. I need to understand these patch changes thoroughly. My immediate focus is on the `net/core/sock.c` file, specifically the area surrounding `sk_has_decrypt_user`. I'll zero in on that section of the code and analyze what's been modified. This seems crucial, so let's start reading.

{
  "File": "net/core/sock.c",
  "FirstLine": 2665,
  "LineCount": 25
}

{
  "Contents": "2665:\t\t\t\tmax_segs = max_t(u32, READ_ONCE(dev-\u003egso_max_segs), 1);\n2666:\t\t\t}\n2667:\t\t}\n2668:\t\tsk-\u003esk_gso_max_segs = max_segs;\n2669:\t\tsk_dst_set(sk, dst);\n2670:\t\trcu_read_unlock();\n2671:\t}\n2672:\tEXPORT_SYMBOL_GPL(sk_setup_caps);\n2673:\t\n2674:\tbool sk_has_decrypt_user(const struct sock *sk)\n2675:\t{\n2676:\t\treturn psp_sk_assoc(sk) ||\n2677:\t\t       (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)); /* for tls */\n2678:\t}\n2679:\t\n2680:\t/*\n2681:\t *\tSimple resource managers for sockets.\n2682:\t */\n2683:\t\n2684:\t\n2685:\t/*\n2686:\t * Write buffer destructor automatically called from kfree_skb.\n2687:\t */\n2688:\tvoid sock_wfree(struct sk_buff *skb)\n2689:\t{\n"
}

gemini-3.8-flash

null

null

							input: 17029
							output: 19
							thoughts: 20
						

**My Thought Process: Navigating the Code**

Okay, so I need to understand `psp_sk_assoc(sk)`. Before I dig in too deep, let's just make sure I have the definition handy. I'm going to have to quickly locate where that function is actually *defined*. I can't really make any headway with this code until I have the base definition in front of me.

{
  "Expression": "psp_sk_assoc"
}

{
  "Output": "include/net/psp/functions.h=33=unsigned int psp_key_size(u32 version);\ninclude/net/psp/functions.h:34:void psp_sk_assoc_free(struct sock *sk);\ninclude/net/psp/functions.h-35-void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk);\n--\ninclude/net/psp/functions.h=37=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb);\ninclude/net/psp/functions.h-38-\ninclude/net/psp/functions.h:39:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-40-{\n--\ninclude/net/psp/functions.h=45=psp_enqueue_set_decrypted(struct sock *sk, struct sk_buff *skb)\n--\ninclude/net/psp/functions.h-48-\ninclude/net/psp/functions.h:49:\tpas = psp_sk_assoc(sk);\ninclude/net/psp/functions.h-50-\tif (pas \u0026\u0026 pas-\u003etx.spi)\n--\ninclude/net/psp/functions.h=116=psp_sk_rx_policy_check(struct sock *sk, struct sk_buff *skb)\ninclude/net/psp/functions.h-117-{\ninclude/net/psp/functions.h:118:\treturn __psp_sk_rx_policy_check(skb, psp_sk_assoc(sk));\ninclude/net/psp/functions.h-119-}\n--\ninclude/net/psp/functions.h=150=static inline unsigned int psp_sk_overhead(const struct sock *sk)\n--\ninclude/net/psp/functions.h-157-#else\ninclude/net/psp/functions.h:158:static inline void psp_sk_assoc_free(struct sock *sk) { }\ninclude/net/psp/functions.h-159-static inline void\n--\ninclude/net/psp/functions.h=163=psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb) { }\ninclude/net/psp/functions.h-164-\ninclude/net/psp/functions.h:165:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-166-{\n--\nnet/core/sock.c=2674=bool sk_has_decrypt_user(const struct sock *sk)\nnet/core/sock.c-2675-{\nnet/core/sock.c:2676:\treturn psp_sk_assoc(sk) ||\nnet/core/sock.c-2677-\t       (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)); /* for tls */\n--\nnet/ipv4/af_inet.c=140=void inet_sock_destruct(struct sock *sk)\n--\nnet/ipv4/af_inet.c-166-\tdst_release(rcu_dereference_protected(sk-\u003esk_rx_dst, 1));\nnet/ipv4/af_inet.c:167:\tpsp_sk_assoc_free(sk);\nnet/ipv4/af_inet.c-168-}\n--\nnet/psp/psp_sock.c=118=void psp_assoc_put(struct psp_assoc *pas)\n--\nnet/psp/psp_sock.c-123-\nnet/psp/psp_sock.c:124:void psp_sk_assoc_free(struct sock *sk)\nnet/psp/psp_sock.c-125-{\n--\nnet/psp/psp_sock.c=132=int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n--\nnet/psp/psp_sock.c-141-\nnet/psp/psp_sock.c:142:\tif (psp_sk_assoc(sk)) {\nnet/psp/psp_sock.c-143-\t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n--\nnet/psp/psp_sock.c=181=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp_sock.c-190-\nnet/psp/psp_sock.c:191:\tpas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-192-\tif (!pas) {\n--\nnet/psp/psp_sock.c=270=void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk)\nnet/psp/psp_sock.c-271-{\nnet/psp/psp_sock.c:272:\tstruct psp_assoc *pas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-273-\n"
}

gemini-3.8-flash

null

null

							input: 18450
							output: 38
							thoughts: 23
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into TCP ULP Implementation**

Okay, so I need to understand this specific behavior. Let's start by pinpointing the area of interest. My gut feeling is that the issue is likely within the TCP User-Level Protocol (ULP) handling. Therefore, I should check the core implementation, specifically `net/ipv4/tcp_ulp.c`... and I have a strong hunch that the relevant logic is centered around line 136. I'll need to scrutinize what's happening there to understand the control flow and data manipulation in that region, or at the very least get an understanding of the functions that are being called there. Let's see what's happening.

{
  "File": "net/ipv4/tcp_ulp.c",
  "FirstLine": 125,
  "LineCount": 35
}

{
  "Contents": " 125:\t\tmodule_put(icsk-\u003eicsk_ulp_ops-\u003eowner);\n 126:\t\n 127:\t\ticsk-\u003eicsk_ulp_ops = NULL;\n 128:\t}\n 129:\t\n 130:\tstatic int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)\n 131:\t{\n 132:\t\tstruct inet_connection_sock *icsk = inet_csk(sk);\n 133:\t\tint err;\n 134:\t\n 135:\t\terr = -EEXIST;\n 136:\t\tif (icsk-\u003eicsk_ulp_ops)\n 137:\t\t\tgoto out_err;\n 138:\t\n 139:\t\terr = -EINVAL;\n 140:\t\tif (sk_has_decrypt_user(sk))\n 141:\t\t\tgoto out_err;\n 142:\t\n 143:\t\tif (sk-\u003esk_socket)\n 144:\t\t\tclear_bit(SOCK_SUPPORT_ZC, \u0026sk-\u003esk_socket-\u003eflags);\n 145:\t\n 146:\t\terr = -ENOTCONN;\n 147:\t\tif (!ulp_ops-\u003eclone \u0026\u0026 sk-\u003esk_state == TCP_LISTEN)\n 148:\t\t\tgoto out_err;\n 149:\t\n 150:\t\terr = ulp_ops-\u003einit(sk);\n 151:\t\tif (err)\n 152:\t\t\tgoto out_err;\n 153:\t\n 154:\t\ticsk-\u003eicsk_ulp_ops = ulp_ops;\n 155:\t\treturn 0;\n 156:\tout_err:\n 157:\t\tmodule_put(ulp_ops-\u003eowner);\n 158:\t\treturn err;\n 159:\t}\n"
}

gemini-3.8-flash

null

null

							input: 19171
							output: 37
							thoughts: 22
						

Here's my summary, as if I were thinking these thoughts:

**Analyzing the PSP Socket Code**

Okay, time to dive into this. Based on what we're troubleshooting, my instinct is pointing towards a potential issue within the PSP socket code, specifically in the `net/psp/psp_sock.c` file. The problem area seems to be around line 143. I need to take a look at the code there to see if I can spot anything out of the ordinary, anything that could be contributing to the observed behavior. It's a targeted investigation, focusing on a specific part of the codebase where a socket is created or handled. Let's see what's going on...

{
  "File": "net/psp/psp_sock.c",
  "FirstLine": 130,
  "LineCount": 35
}

{
  "Contents": " 130:\t}\n 131:\t\n 132:\tint psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n 133:\t\t\t\t  struct psp_key_parsed *key,\n 134:\t\t\t\t  struct netlink_ext_ack *extack)\n 135:\t{\n 136:\t\tint err;\n 137:\t\n 138:\t\tmemcpy(\u0026pas-\u003erx, key, sizeof(*key));\n 139:\t\n 140:\t\tlock_sock(sk);\n 141:\t\n 142:\t\tif (psp_sk_assoc(sk)) {\n 143:\t\t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n 144:\t\t\terr = -EBUSY;\n 145:\t\t\tgoto exit_unlock;\n 146:\t\t} else if (sk_has_decrypt_user(sk)) {\n 147:\t\t\tNL_SET_ERR_MSG(extack, \"Socket has incompatible state\");\n 148:\t\t\terr = -EINVAL;\n 149:\t\t\tgoto exit_unlock;\n 150:\t\t}\n 151:\t\n 152:\t\trefcount_inc(\u0026pas-\u003erefcnt);\n 153:\t\trcu_assign_pointer(sk-\u003epsp_assoc, pas);\n 154:\t\terr = 0;\n 155:\t\n 156:\texit_unlock:\n 157:\t\trelease_sock(sk);\n 158:\t\n 159:\t\treturn err;\n 160:\t}\n 161:\t\n 162:\tstatic int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n 163:\t{\n 164:\t\tstruct psp_skb_ext *pse;\n"
}

gemini-3.8-flash

null

null

							input: 19874
							output: 21
							thoughts: 508
						

**Analyzing the ULP and PSP Association Logic**

Okay, let's break this down. First, I'm looking at `sk_has_decrypt_user`. It seems straightforward: it checks if a socket has a PSP association or if it's an inet socket with a User-Level Protocol (ULP) attached, specifically TLS. Now, the `__tcp_set_ulp` function has an interesting check. It's supposed to set a ULP, but it first makes sure one isn't already set (`icsk->icsk_ulp_ops`). And here's the kicker: it *also* checks `sk_has_decrypt_user`. If a socket already has a decrypting user (meaning either a PSP association or TLS, according to `sk_has_decrypt_user`), it bails.

My mind immediately starts putting the pieces together. If `icsk->icsk_ulp_ops` is NULL (no ULP), `inet_csk_has_ulp(sk)` will also be false, however, if `psp_sk_assoc(sk)` is set, `sk_has_decrypt_user(sk)` is true.

Then I get to `psp_sock_assoc_set_rx`. This is where it starts to get interesting. It *also* checks if the socket already has a PSP state. But if it doesn't, it checks `sk_has_decrypt_user`. Here's the key: if `psp_sk_assoc(sk)` is false, and `sk_has_decrypt_user(sk)` returns true, it results in an `-EINVAL` error in `psp_sock_assoc_set_rx`. This means that if a socket has, for example, a TLS ULP attached, `psp_sock_assoc_set_rx` will fail!

The current code flow says if a ULP is set, then no PSP state can be set. This seems to be a conflict.

My next step is to see if `sk_has_decrypt_user` is called from *anywhere else*. This could provide more context on the intended behavior and whether this observed behavior is actually a bug.

{
  "Expression": "sk_has_decrypt_user"
}

{
  "Output": "include/net/sock.h=2309=static inline void sk_gso_disable(struct sock *sk)\n--\ninclude/net/sock.h-2314-\ninclude/net/sock.h:2315:bool sk_has_decrypt_user(const struct sock *sk);\ninclude/net/sock.h-2316-\n--\nnet/core/sock.c=2672=EXPORT_SYMBOL_GPL(sk_setup_caps);\nnet/core/sock.c-2673-\nnet/core/sock.c:2674:bool sk_has_decrypt_user(const struct sock *sk)\nnet/core/sock.c-2675-{\n--\nnet/ipv4/tcp_ulp.c=130=static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)\n--\nnet/ipv4/tcp_ulp.c-139-\terr = -EINVAL;\nnet/ipv4/tcp_ulp.c:140:\tif (sk_has_decrypt_user(sk))\nnet/ipv4/tcp_ulp.c-141-\t\tgoto out_err;\n--\nnet/psp/psp_sock.c=132=int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n--\nnet/psp/psp_sock.c-145-\t\tgoto exit_unlock;\nnet/psp/psp_sock.c:146:\t} else if (sk_has_decrypt_user(sk)) {\nnet/psp/psp_sock.c-147-\t\tNL_SET_ERR_MSG(extack, \"Socket has incompatible state\");\n"
}

gemini-3.8-flash

null

null

							input: 21304
							output: 19
							thoughts: 136
						

**Investigating This Patch**

Okay, so I need to get a handle on this patch. My initial instinct is to jump into the `git` history – a quick `git show` or `git log` would usually give me the context I need. Damn, we're not using Git directly here. No problem, let's work with what we *do* have. We've got `grepper` and `read-file` which can fill in some blanks.

Hold on, before I dive too deep, I need to understand the practical implications of this. Is this even relevant to the QEMU environment, or our typical fuzzing setup? That's the real question. Also, what the heck is "PSP" here? Gotta clear that up immediately.

Alright, let's switch gears. Let me search for how a PSP device gets created. Let's see how the kernel handles PSP devices. I need to understand the driver interactions. Does it have hardware dependencies? Can this be instantiated on a network device, either real or virtual?

Okay, let's start with a focused grep. I'll search for `psp_dev_create` – that's gotta be the key.

{
  "Expression": "psp_dev_create"
}

{
  "Output": "drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c=1031=int mlx5e_psp_register(struct mlx5e_priv *priv)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-1045-\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:1046:\tpsd = psp_dev_create(priv-\u003enetdev, \u0026mlx5_psp_ops, \u0026psp-\u003ecaps, NULL);\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-1047-\tif (IS_ERR(psd)) {\n--\ndrivers/net/netdevsim/psp.c=244=nsim_psp_rereg_write(struct file *file, const char __user *data, size_t count,\n--\ndrivers/net/netdevsim/psp.c-253-\ndrivers/net/netdevsim/psp.c:254:\tpsd = psp_dev_create(ns-\u003enetdev, \u0026nsim_psp_ops, \u0026nsim_psp_caps, ns);\ndrivers/net/netdevsim/psp.c-255-\tif (IS_ERR(psd)) {\n--\ndrivers/net/netdevsim/psp.c=274=int nsim_psp_init(struct netdevsim *ns)\n--\ndrivers/net/netdevsim/psp.c-278-\ndrivers/net/netdevsim/psp.c:279:\tpsd = psp_dev_create(ns-\u003enetdev, \u0026nsim_psp_ops, \u0026nsim_psp_caps, ns);\ndrivers/net/netdevsim/psp.c-280-\tif (IS_ERR(psd))\n--\ninclude/net/psp/functions.h=16=struct psp_dev *\ninclude/net/psp/functions.h:17:psp_dev_create(struct net_device *netdev, struct psp_dev_ops *psd_ops,\ninclude/net/psp/functions.h-18-\t       struct psp_dev_caps *psd_caps, void *priv_ptr);\n--\nnet/psp/psp_main.c=38=int psp_dev_check_access(struct psp_dev *psd, struct net *net, bool admin)\n--\nnet/psp/psp_main.c-49-/**\nnet/psp/psp_main.c:50: * psp_dev_create() - create and register PSP device\nnet/psp/psp_main.c-51- * @netdev:\tmain netdevice\n--\nnet/psp/psp_main.c=58=struct psp_dev *\nnet/psp/psp_main.c:59:psp_dev_create(struct net_device *netdev,\nnet/psp/psp_main.c-60-\t       struct psp_dev_ops *psd_ops, struct psp_dev_caps *psd_caps,\n--\nnet/psp/psp_main.c-114-}\nnet/psp/psp_main.c:115:EXPORT_SYMBOL(psp_dev_create);\nnet/psp/psp_main.c-116-\n"
}

gemini-3.8-flash

null

null

							input: 22547
							output: 20
							thoughts: 165
						

**My Initial Thoughts on TCP ULP and Netdevsim**

Okay, so `netdevsim` has PSP support – that's a good starting point (found it in `drivers/net/netdevsim/psp.c`). Now, what's really catching my attention is that `__tcp_set_ulp` is right there in `net/ipv4/tcp_ulp.c`, which is *the* core TCP ULP mechanism. It's used by `setsockopt(TCP_ULP)` for important things like kTLS, BPF sockops, and so on.

Hang on a second… I'm noticing something crucial. `__tcp_set_ulp` is invoked *every* single time a TCP socket configures a ULP, particularly when using `setsockopt(fd, SOL_TCP, TCP_ULP, ...)`. And look at this: `sk_has_decrypt_user` is being called unconditionally from *within* `__tcp_set_ulp` on *every* TCP ULP attachment. That's a key observation.

Alright, let's step back and take a look at the call sites for `__tcp_set_ulp` to get a better handle on the bigger picture.

{
  "Expression": "__tcp_set_ulp"
}

{
  "Output": "net/ipv4/tcp_ulp.c=112=void tcp_cleanup_ulp(struct sock *sk)\n--\nnet/ipv4/tcp_ulp.c-129-\nnet/ipv4/tcp_ulp.c:130:static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)\nnet/ipv4/tcp_ulp.c-131-{\n--\nnet/ipv4/tcp_ulp.c=161=int tcp_set_ulp(struct sock *sk, const char *name)\n--\nnet/ipv4/tcp_ulp.c-170-\nnet/ipv4/tcp_ulp.c:171:\treturn __tcp_set_ulp(sk, ulp_ops);\nnet/ipv4/tcp_ulp.c-172-}\n"
}

gemini-3.8-flash

null

null

							input: 23217
							output: 19
							thoughts: 52
						

Here's my summary, as the expert:

**Investigating TCP User-Level Protocol (ULP) Configuration**

Okay, so I'm digging into how the User-Level Protocol (ULP) is set up with TCP. I see `tcp_set_ulp` is called, specifically within `do_tcp_setsockopt` when the `TCP_ULP` option is used. Interesting. And it appears `tcp_set_ulp_id` is called too. That's a good starting point. Now, to truly understand the mechanics, I need to delve deeper into the implementation of `tcp_set_ulp`. I'll want to see how the ULP ID is handled, how the socket options relate to the TCP control block, and what specific states or conditions trigger this function. Knowing how these things are related will give me the information I need.

{
  "Expression": "tcp_set_ulp"
}

{
  "Output": "include/net/tcp.h=2829=void tcp_unregister_ulp(struct tcp_ulp_ops *type);\ninclude/net/tcp.h:2830:int tcp_set_ulp(struct sock *sk, const char *name);\ninclude/net/tcp.h-2831-void tcp_get_available_ulp(char *buf, size_t len);\n--\nnet/ipv4/tcp.c=3836=int do_tcp_setsockopt(struct sock *sk, int level, int optname,\n--\nnet/ipv4/tcp.c-3879-\t\tsockopt_lock_sock(sk);\nnet/ipv4/tcp.c:3880:\t\terr = tcp_set_ulp(sk, name);\nnet/ipv4/tcp.c-3881-\t\tsockopt_release_sock(sk);\n--\nnet/ipv4/tcp_ulp.c=112=void tcp_cleanup_ulp(struct sock *sk)\n--\nnet/ipv4/tcp_ulp.c-129-\nnet/ipv4/tcp_ulp.c:130:static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)\nnet/ipv4/tcp_ulp.c-131-{\n--\nnet/ipv4/tcp_ulp.c-160-\nnet/ipv4/tcp_ulp.c:161:int tcp_set_ulp(struct sock *sk, const char *name)\nnet/ipv4/tcp_ulp.c-162-{\n--\nnet/ipv4/tcp_ulp.c-170-\nnet/ipv4/tcp_ulp.c:171:\treturn __tcp_set_ulp(sk, ulp_ops);\nnet/ipv4/tcp_ulp.c-172-}\n--\nnet/mptcp/subflow.c=1781=int mptcp_subflow_create_socket(struct sock *sk, unsigned short family,\n--\nnet/mptcp/subflow.c-1812-\tsk_net_refcnt_upgrade(sf-\u003esk);\nnet/mptcp/subflow.c:1813:\terr = tcp_set_ulp(sf-\u003esk, \"mptcp\");\nnet/mptcp/subflow.c-1814-\tif (err)\n"
}

gemini-3.8-flash

null

null

							input: 24065
							output: 19
							thoughts: 98
						

**Diving into the PSP Codebase**

Okay, so I'm looking at this PSP implementation, and my initial instinct is to go straight to the foundational stuff. I know that `net/ipv4/tcp_ulp.c` and `net/core/sock.c` are going to be critical – the core networking infrastructure is always a good starting point. Understanding how PSP interacts with those fundamental layers is key to understanding its overall functionality.

Then, I remember there are specific testing methods for PSP. I need to refresh my memory on the tools available. Ah, yes, `netdevsim` and generic netlink, particularly the `PSP_CMD_RX_ASSOC` command. That's a great lead. Now I need to figure out where that `PSP_CMD_RX_ASSOC` command is actually being invoked. Let's see... a quick search should turn up the calling function. Okay, it looks like `psp_rx_assoc_doit` is the key. That suggests that the relevant code should be in `net/psp/`, which makes sense. I will start there to see how this association command works!

{
  "Expression": "psp_rx_assoc"
}

{
  "Output": "net/psp/psp-nl-gen.c=32=static const struct nla_policy psp_key_rotate_nl_policy[PSP_A_DEV_ID + 1] = {\n--\nnet/psp/psp-nl-gen.c-36-/* PSP_CMD_RX_ASSOC - do */\nnet/psp/psp-nl-gen.c:37:static const struct nla_policy psp_rx_assoc_nl_policy[PSP_A_ASSOC_SOCK_FD + 1] = {\nnet/psp/psp-nl-gen.c-38-\t[PSP_A_ASSOC_DEV_ID] = NLA_POLICY_MIN(NLA_U32, 1),\n--\nnet/psp/psp-nl-gen.c=71=static const struct genl_split_ops psp_nl_ops[] = {\n--\nnet/psp/psp-nl-gen.c-108-\t\t.post_doit\t= psp_device_unlock,\nnet/psp/psp-nl-gen.c:109:\t\t.policy\t\t= psp_rx_assoc_nl_policy,\nnet/psp/psp-nl-gen.c-110-\t\t.maxattr\t= PSP_A_ASSOC_SOCK_FD,\n--\ntools/testing/selftests/drivers/net/psp_responder.c=40=static int conn_setup_psp(struct ynl_sock *ys, struct opts *opts, int data_sock)\ntools/testing/selftests/drivers/net/psp_responder.c-41-{\ntools/testing/selftests/drivers/net/psp_responder.c:42:\tstruct psp_rx_assoc_rsp *rsp;\ntools/testing/selftests/drivers/net/psp_responder.c:43:\tstruct psp_rx_assoc_req *req;\ntools/testing/selftests/drivers/net/psp_responder.c-44-\tstruct psp_tx_assoc_rsp *tsp;\n--\ntools/testing/selftests/drivers/net/psp_responder.c-53-\t// Rx assoc alloc\ntools/testing/selftests/drivers/net/psp_responder.c:54:\treq = psp_rx_assoc_req_alloc();\ntools/testing/selftests/drivers/net/psp_responder.c-55-\ntools/testing/selftests/drivers/net/psp_responder.c:56:\tpsp_rx_assoc_req_set_sock_fd(req, data_sock);\ntools/testing/selftests/drivers/net/psp_responder.c:57:\tpsp_rx_assoc_req_set_version(req, psp_vers.rx);\ntools/testing/selftests/drivers/net/psp_responder.c-58-\ntools/testing/selftests/drivers/net/psp_responder.c:59:\trsp = psp_rx_assoc(ys, req);\ntools/testing/selftests/drivers/net/psp_responder.c:60:\tpsp_rx_assoc_req_free(req);\ntools/testing/selftests/drivers/net/psp_responder.c-61-\n--\ntools/testing/selftests/drivers/net/psp_responder.c-73-\tsend(data_sock, info, sz, MSG_WAITALL);\ntools/testing/selftests/drivers/net/psp_responder.c:74:\tpsp_rx_assoc_rsp_free(rsp);\ntools/testing/selftests/drivers/net/psp_responder.c-75-\n"
}

gemini-3.8-flash

null

null

							input: 25304
							output: 23
							thoughts: 19
						

Here's my thought process, as if I were analyzing that code:

**Analyzing the Callers of `psp_sock_assoc_set_rx`**

Okay, so I need to understand where `psp_sock_assoc_set_rx` is being invoked. That's the key to understanding its overall impact and how it fits into the broader architecture. I'll need to trace its calls to see which other functions or modules depend on it. This will show me the data flow and any side effects. I'm going to carefully note the context of each call, paying close attention to any parameters passed and how the return value of `psp_sock_assoc_set_rx` is handled. Depending on the complexity and scope of the code base, I might use a debugger, a static analyzer, or good old-fashioned code search and grep to find the call sites. I'm also going to watch out for indirect calls or function pointers, because those can often be the trickiest to track down. This could lead to a deeper understanding of the system's socket association management strategy and potentially highlight areas for optimization or potential issues.

{
  "Expression": "psp_sock_assoc_set_rx"
}

{
  "Output": "net/psp/psp.h=25=void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas);\nnet/psp/psp.h:26:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp.h-27-\t\t\t  struct psp_key_parsed *key,\n--\nnet/psp/psp_nl.c=770=int psp_nl_rx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-809-\nnet/psp/psp_nl.c:810:\terr = psp_sock_assoc_set_rx(socket-\u003esk, pas, \u0026key, info-\u003eextack);\nnet/psp/psp_nl.c-811-\tif (err) {\n--\nnet/psp/psp_sock.c=124=void psp_sk_assoc_free(struct sock *sk)\n--\nnet/psp/psp_sock.c-131-\nnet/psp/psp_sock.c:132:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp_sock.c-133-\t\t\t  struct psp_key_parsed *key,\n"
}

gemini-3.8-flash

null

null

							input: 25941
							output: 32
							thoughts: 102
						

**Diving into the PSP Codebase**

Okay, so I'm digging into this PSP stuff, and my first stop is `net/psp/psp_nl.c`. Right away, `psp_nl_rx_assoc_doit` jumps out at me – it's a generic netlink handler. I need to understand what's triggering this function. Naturally, I want to see if PSP has any associated configuration options. `net/psp/Kconfig` is the obvious place to look.

Aha! `INET_PSP`: "bool PSP Security Protocol support". That makes sense, a security protocol usually has dependencies. It looks like it depends on `INET`. But I need to double-check that this is the only dependency, as the context is key. Let me inspect `net/psp/Kconfig` again to make sure there aren't any other gotchas.

{
  "File": "net/psp/Kconfig",
  "FirstLine": 1,
  "LineCount": 25
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# PSP configuration\n   4:\t#\n   5:\tconfig INET_PSP\n   6:\t\tbool \"PSP Security Protocol support\"\n   7:\t\tdepends on INET\n   8:\t\tselect SKB_DECRYPTED\n   9:\t\tselect SKB_EXTENSIONS\n  10:\t\tselect SOCK_VALIDATE_XMIT\n  11:\t\thelp\n  12:\t\tEnable kernel support for the PSP Security Protocol (PSP).\n  13:\t\tFor more information see:\n  14:\t\t  https://raw.githubusercontent.com/google/psp/main/doc/PSP_Arch_Spec.pdf\n  15:\t\n  16:\t\tIf unsure, say N.\n"
}

gemini-3.8-flash

null

null

							input: 26467
							output: 17
							thoughts: 23
						

**Investigating the INET_PSP Source**

Okay, so I need to figure out where `INET_PSP` is defined, or at least sourced from, within the kernel config files. My intuition tells me to start in `net/ipv4/Kconfig` – that's the most logical place given what it relates to – but it could potentially be elsewhere. It's a key configuration option, so I need to understand its dependencies and how it's being used. Best to go straight to the source and verify its location. I'll take a look at that file first and trace through any includes if it's not immediately obvious. Knowing exactly where this setting is defined is crucial for understanding its impact on the network stack. Let's see what that file reveals...

{
  "Expression": "INET_PSP"
}

{
  "Output": "drivers/net/ethernet/mellanox/mlx5/core/Kconfig=210=config MLX5_EN_PSP\ndrivers/net/ethernet/mellanox/mlx5/core/Kconfig-211-\tbool \"Mellanox Technologies support for PSP cryptography-offload acceleration\"\ndrivers/net/ethernet/mellanox/mlx5/core/Kconfig:212:\tdepends on INET_PSP\ndrivers/net/ethernet/mellanox/mlx5/core/Kconfig-213-\tdepends on MLX5_CORE_EN\n--\ndrivers/net/netdevsim/Makefile=19=endif\ndrivers/net/netdevsim/Makefile-20-\ndrivers/net/netdevsim/Makefile:21:ifneq ($(CONFIG_INET_PSP),)\ndrivers/net/netdevsim/Makefile-22-netdevsim-objs += psp.o\n--\ndrivers/net/netdevsim/netdevsim.h=445=static inline void nsim_macsec_teardown(struct netdevsim *ns)\n--\ndrivers/net/netdevsim/netdevsim.h-449-\ndrivers/net/netdevsim/netdevsim.h:450:#if IS_ENABLED(CONFIG_INET_PSP)\ndrivers/net/netdevsim/netdevsim.h-451-int nsim_psp_init(struct netdevsim *ns);\n--\ninclude/linux/netdevice.h=2158=struct net_device {\n--\ninclude/linux/netdevice.h-2388-#endif\ninclude/linux/netdevice.h:2389:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/linux/netdevice.h-2390-\tstruct psp_dev __rcu\t*psp_dev;\n--\ninclude/linux/skbuff.h=5043=enum skb_ext_id {\n--\ninclude/linux/skbuff.h-5058-#endif\ninclude/linux/skbuff.h:5059:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/linux/skbuff.h-5060-\tSKB_EXT_PSP,\n--\ninclude/net/inet_timewait_sock.h=33=struct inet_timewait_sock {\n--\ninclude/net/inet_timewait_sock.h-84-\tstruct inet_bind2_bucket\t*tw_tb2;\ninclude/net/inet_timewait_sock.h:85:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/inet_timewait_sock.h-86-\tstruct psp_assoc __rcu\t  *psp_assoc;\n--\ninclude/net/psp/functions.h=27=static inline void *psp_assoc_drv_data(struct psp_assoc *pas)\n--\ninclude/net/psp/functions.h-31-\ninclude/net/psp/functions.h:32:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/psp/functions.h-33-unsigned int psp_key_size(u32 version);\n--\ninclude/net/sock.h=365=struct sock {\n--\ninclude/net/sock.h-466-#endif\ninclude/net/sock.h:467:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/sock.h-468-\tstruct psp_assoc __rcu\t*psp_assoc;\n--\nnet/Makefile=20=obj-$(CONFIG_UNIX)\t\t+= unix/\nnet/Makefile:21:obj-$(CONFIG_INET_PSP)\t\t+= psp/\nnet/Makefile-22-obj-y\t\t\t\t+= ipv6/\n--\nnet/core/skbuff.c=5150=static const u8 skb_ext_type_len[] = {\n--\nnet/core/skbuff.c-5165-#endif\nnet/core/skbuff.c:5166:#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/skbuff.c-5167-\t[SKB_EXT_PSP] = SKB_EXT_CHUNKSIZEOF(struct psp_skb_ext),\n--\nnet/core/sock.c=2480=struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n--\nnet/core/sock.c-2497-#endif\nnet/core/sock.c:2498:#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/sock.c-2499-\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\n--\nnet/psp/Kconfig-4-#\nnet/psp/Kconfig:5:config INET_PSP\nnet/psp/Kconfig-6-\tbool \"PSP Security Protocol support\"\n--\nnet/psp/Makefile-2-\nnet/psp/Makefile:3:obj-$(CONFIG_INET_PSP) += psp.o\nnet/psp/Makefile-4-\n--\ntools/testing/selftests/drivers/net/config=3=CONFIG_DEBUG_INFO_BTF_MODULES=n\ntools/testing/selftests/drivers/net/config:4:CONFIG_INET_PSP=y\ntools/testing/selftests/drivers/net/config-5-CONFIG_IPV6=y\n"
}

gemini-3.8-flash

null

null

							input: 27986
							output: 37
							thoughts: 159
						

**My Configuration Investigation**

Okay, let's break this down. First, `INET_PSP` enables the `net/psp/` directory, that much is clear. And, `NETDEVSIM` brings in `drivers/net/netdevsim/psp.c`. Now, I need to understand the dependencies for `TCP_ULP`. It seems it's always available within `net/ipv4/tcp_ulp.c` as long as `INET` is defined. Excellent. And, as expected, `TLS`, or kTLS as it's often called, is simply controlled by `CONFIG_TLS`.

But I have a nagging question: what happens if `INET_PSP` *isn't* set? It's essential to understand the fallback, right? I'll need to look at `include/net/psp/functions.h` to see how it's handled in that scenario. That's the key now. Time to dive into that header file.

{
  "File": "include/net/psp/functions.h",
  "FirstLine": 150,
  "LineCount": 40
}

{
  "Contents": " 150:\tstatic inline unsigned int psp_sk_overhead(const struct sock *sk)\n 151:\t{\n 152:\t\tint psp_encap = sizeof(struct udphdr) + PSP_HDR_SIZE + PSP_TRL_SIZE;\n 153:\t\tbool has_psp = rcu_access_pointer(sk-\u003epsp_assoc);\n 154:\t\n 155:\t\treturn has_psp ? psp_encap : 0;\n 156:\t}\n 157:\t#else\n 158:\tstatic inline void psp_sk_assoc_free(struct sock *sk) { }\n 159:\tstatic inline void\n 160:\tpsp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk) { }\n 161:\tstatic inline void psp_twsk_assoc_free(struct inet_timewait_sock *tw) { }\n 162:\tstatic inline void\n 163:\tpsp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb) { }\n 164:\t\n 165:\tstatic inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\n 166:\t{\n 167:\t\treturn NULL;\n 168:\t}\n 169:\t\n 170:\tstatic inline void\n 171:\tpsp_enqueue_set_decrypted(struct sock *sk, struct sk_buff *skb) { }\n 172:\t\n 173:\tstatic inline unsigned long\n 174:\t__psp_skb_coalesce_diff(const struct sk_buff *one, const struct sk_buff *two,\n 175:\t\t\t\tunsigned long diffs)\n 176:\t{\n 177:\t\treturn diffs;\n 178:\t}\n 179:\t\n 180:\tstatic inline enum skb_drop_reason\n 181:\tpsp_sk_rx_policy_check(struct sock *sk, struct sk_buff *skb)\n 182:\t{\n 183:\t\treturn 0;\n 184:\t}\n 185:\t\n 186:\tstatic inline enum skb_drop_reason\n 187:\tpsp_twsk_rx_policy_check(struct inet_timewait_sock *tw, struct sk_buff *skb)\n 188:\t{\n 189:\t\treturn 0;\n"
}

gemini-3.8-flash

null

null

							input: 29046
							output: 22
							thoughts: 1516
						

**Analysis of Potential Fuzzing Targets in Network Socket State Validation**

Alright, let's break this down. My initial assessment is that this patch introduces interesting changes related to socket state validation and mutual exclusion between PSP (likely for packet-processing offload) and TCP ULP (User-Level Protocol), like kTLS. It seems this is a prime candidate for fuzzing.

My thinking is this:

The patch introduces a new function, `sk_has_decrypt_user(const struct sock *sk)`, which seems critical. Its purpose appears to be determining if a socket *can* handle decryption (whether PSP or ULP is associated). The logic appears to short-circuit if `psp_sk_assoc(sk)` returns a value. If not, and it is an inet socket, it checks `inet_csk_has_ulp(sk)` which is for kTLS. The key changes are in `net/core/sock.c`, `net/ipv4/tcp_ulp.c`, and `net/psp/psp_sock.c`. These are core networking components, and I see direct code modification. These are definitely worth our attention.

The patch seems to affect socket state management in the following ways:

*   In `net/ipv4/tcp_ulp.c`, `__tcp_set_ulp` (which is called by the exported function `tcp_set_ulp`) is now checked against `sk_has_decrypt_user(sk)`. This prevents a ULP (like kTLS) from being set on a socket that *already* has PSP state, or vice-versa.
*   In `net/psp/psp_sock.c`, `psp_sock_assoc_set_rx` (called via netlink) now checks `sk_has_decrypt_user(sk)` as well, to maintain the mutual exclusion, and errors out with -EINVAL.

This suggests a race condition or state corruption is possible if an attacker or fuzzer can set both PSP and ULP simultaneously, or in a specific order via setsockopt and netlink. This is a very interesting vector. The self-tests in `tools/testing/selftests/drivers/net/psp.py` (specifically `assoc_psp_ulp_exclusive` and `assoc_ulp_psp_exclusive`) confirm this and seem designed to trigger such conditions. Given that the configuration has `CONFIG_TLS=y` in the associated configuration, kTLS is also available on the system.

This definitely aligns with my "WorthFuzzing=true" criteria: core subsystem modifications, protocol handling changes, and reachable code. It’s accessible via generic netlink (PSP) and standard TCP `setsockopt` (TCP_ULP), making it an approachable target.

My focus should be on these symbols:

*   `sk_has_decrypt_user`: This is the linchpin function, it directly controls access to conflicting states.
*   `tcp_set_ulp`: This is the TCP User Level Protocol set function and exposed to userspace.
*   `psp_sock_assoc_set_rx`: This function is called from the netlink `doit` handler.
*   `psp_nl_rx_assoc_doit`: The netlink doit handler.

I think fuzzing these symbols and the state transition logic around them will be fruitful. I'll need to pay close attention to the error codes returned and how the socket state changes. Fuzzing with both setsockopt and netlink messages, and in various orderings/concurrently, will be key to uncovering any vulnerabilities. I also need to make sure that the fuzzer covers the kTLS configuration path.

{
  "Expression": "inet_csk_has_ulp"
}

{
  "Output": "include/net/inet_connection_sock.h=338=static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)\n--\ninclude/net/inet_connection_sock.h-345-\ninclude/net/inet_connection_sock.h:346:static inline bool inet_csk_has_ulp(const struct sock *sk)\ninclude/net/inet_connection_sock.h-347-{\n--\nnet/core/skmsg.c=750=struct sk_psock *sk_psock_init(struct sock *sk, int node)\n--\nnet/core/skmsg.c-756-\nnet/core/skmsg.c:757:\tif (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)) {\nnet/core/skmsg.c-758-\t\tpsock = ERR_PTR(-EINVAL);\n--\nnet/core/sock.c=2674=bool sk_has_decrypt_user(const struct sock *sk)\n--\nnet/core/sock.c-2676-\treturn psp_sk_assoc(sk) ||\nnet/core/sock.c:2677:\t       (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)); /* for tls */\nnet/core/sock.c-2678-}\n--\nnet/ipv4/tcp_bpf.c=725=int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)\n--\nnet/ipv4/tcp_bpf.c-734-\tif (restore) {\nnet/ipv4/tcp_bpf.c:735:\t\tif (inet_csk_has_ulp(sk)) {\nnet/ipv4/tcp_bpf.c-736-\t\t\t/* TLS does not have an unhash proto in SW cases,\n"
}

gemini-3.8-flash

null

null

							input: 31854
							output: 37
							thoughts: 263
						

**My Configuration Deep Dive**

Okay, time to make sure my configuration is sound. Let's break down these requirements piece by piece. First up, `INET_PSP`. I know the net/psp/ directory only gets built if `CONFIG_INET_PSP` is enabled. A quick glance at the Makefile confirms this with `obj-$(CONFIG_INET_PSP) += psp/`. Also, I'm already aware that `psp_sock_assoc_set_rx` is sitting comfortably within `net/psp/psp_sock.c`. Now, looking at `net/psp/Kconfig`, it's clear: `CONFIG_INET_PSP` is a boolean, depends on `INET`, and selectively enables `SKB_DECRYPTED`, `SKB_EXTENSIONS`, and `SOCK_VALIDATE_XMIT`. So far, so good.

Next, `NETDEVSIM`. Right, PSP devices can be simulated using netdevsim, which makes sense. But, and this is the important question, do I *need* `NETDEVSIM` to execute `psp_sock_assoc_set_rx`? That's the real crux. To be certain, I need to trace the call. I'll check how `psp_sock_assoc_set_rx` is invoked, and that means diving into `psp_nl_rx_assoc_doit`. I'll find that in `net/psp/psp_nl.c` for sure. That's my next stop.

{
  "File": "net/psp/psp_nl.c",
  "FirstLine": 770,
  "LineCount": 60
}

{
  "Contents": " 770:\tint psp_nl_rx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n 771:\t{\n 772:\t\tstruct socket *socket = info-\u003euser_ptr[1];\n 773:\t\tstruct psp_dev *psd = info-\u003euser_ptr[0];\n 774:\t\tstruct psp_key_parsed key;\n 775:\t\tstruct psp_assoc *pas;\n 776:\t\tstruct sk_buff *rsp;\n 777:\t\tu32 version;\n 778:\t\tint err;\n 779:\t\n 780:\t\tif (GENL_REQ_ATTR_CHECK(info, PSP_A_ASSOC_VERSION))\n 781:\t\t\treturn -EINVAL;\n 782:\t\n 783:\t\tversion = nla_get_u32(info-\u003eattrs[PSP_A_ASSOC_VERSION]);\n 784:\t\tif (!(psd-\u003ecaps-\u003eversions \u0026 (1 \u003c\u003c version))) {\n 785:\t\t\tNL_SET_BAD_ATTR(info-\u003eextack, info-\u003eattrs[PSP_A_ASSOC_VERSION]);\n 786:\t\t\treturn -EOPNOTSUPP;\n 787:\t\t}\n 788:\t\n 789:\t\trsp = psp_nl_reply_new(info);\n 790:\t\tif (!rsp)\n 791:\t\t\treturn -ENOMEM;\n 792:\t\n 793:\t\tpas = psp_assoc_create(psd);\n 794:\t\tif (!pas) {\n 795:\t\t\terr = -ENOMEM;\n 796:\t\t\tgoto err_free_rsp;\n 797:\t\t}\n 798:\t\tpas-\u003eversion = version;\n 799:\t\n 800:\t\terr = psd-\u003eops-\u003erx_spi_alloc(psd, version, \u0026key, info-\u003eextack);\n 801:\t\tif (err)\n 802:\t\t\tgoto err_free_pas;\n 803:\t\n 804:\t\tif (nla_put_u32(rsp, PSP_A_ASSOC_DEV_ID, psd-\u003eid) ||\n 805:\t\t    psp_nl_put_key(rsp, PSP_A_ASSOC_RX_KEY, version, \u0026key)) {\n 806:\t\t\terr = -EMSGSIZE;\n 807:\t\t\tgoto err_free_pas;\n 808:\t\t}\n 809:\t\n 810:\t\terr = psp_sock_assoc_set_rx(socket-\u003esk, pas, \u0026key, info-\u003eextack);\n 811:\t\tif (err) {\n 812:\t\t\tNL_SET_BAD_ATTR(info-\u003eextack, info-\u003eattrs[PSP_A_ASSOC_SOCK_FD]);\n 813:\t\t\tgoto err_free_pas;\n 814:\t\t}\n 815:\t\tpsp_assoc_put(pas);\n 816:\t\n 817:\t\treturn psp_nl_reply_send(rsp, info);\n 818:\t\n 819:\terr_free_pas:\n 820:\t\tpsp_assoc_put(pas);\n 821:\terr_free_rsp:\n 822:\t\tnlmsg_free(rsp);\n 823:\t\treturn err;\n 824:\t}\n 825:\t\n 826:\tint psp_nl_tx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n 827:\t{\n 828:\t\tstruct socket *socket = info-\u003euser_ptr[1];\n 829:\t\tstruct psp_dev *psd = info-\u003euser_ptr[0];\n"
}

gemini-3.8-flash

null

null

							input: 33451
							output: 19
							thoughts: 129
						

**Analyzing the PSP Device Setup**

Okay, so looking at this code, `info->user_ptr[0]` clearly points to a `psd`, a `struct psp_dev *`. Now, where does this `psp_dev` come from? Right, netdevsim! When `CONFIG_NETDEVSIM` and `CONFIG_INET_PSP` are both enabled, netdevsim kicks in and creates one. And the comments specifically mention TLS, which means `CONFIG_TLS` for kTLS is likely in play here too. The test is specific about TLS, so it makes sense.

Just to be thorough, I should verify that `INET` is also required. `INET_PSP` is typically dependent on `INET`, but it's always a good habit to double-check these base dependencies in this kind of scenario.

My next step is to head over to Kconfig and confirm all of these dependencies for `NETDEVSIM`. It's all about ensuring that the configuration is solid and all the right pieces are in place for the `psp_dev` to function as expected.

{
  "Expression": "config NETDEVSIM"
}

{
  "Output": "drivers/net/Kconfig=602=source \"drivers/net/hyperv/Kconfig\"\ndrivers/net/Kconfig-603-\ndrivers/net/Kconfig:604:config NETDEVSIM\ndrivers/net/Kconfig-605-\ttristate \"Simulated networking device\"\n"
}

gemini-3.8-flash

null

null

							input: 33919
							output: 34
							thoughts: 19
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into the Network Driver Configuration**

Okay, so I need to zero in on a specific network configuration. Let's start with `drivers/net/Kconfig` – that's where I'd expect the main definitions and dependencies to reside. I'm thinking around line 604, based on my previous experiences working with this area, that's generally where I'd find the relevant config options. That line range usually covers the core networking module configurations. My goal is to quickly locate and understand the options that define the build environment. This particular investigation may point out the dependencies of modules. I need to get this nailed down. Let's see what that Kconfig file has to offer.

{
  "File": "drivers/net/Kconfig",
  "FirstLine": 602,
  "LineCount": 20
}

{
  "Contents": " 602:\tsource \"drivers/net/hyperv/Kconfig\"\n 603:\t\n 604:\tconfig NETDEVSIM\n 605:\t\ttristate \"Simulated networking device\"\n 606:\t\tdepends on DEBUG_FS\n 607:\t\tdepends on INET\n 608:\t\tdepends on PSAMPLE || PSAMPLE=n\n 609:\t\tdepends on PTP_1588_CLOCK_MOCK || PTP_1588_CLOCK_MOCK=n\n 610:\t\tselect NET_DEVLINK\n 611:\t\tselect PAGE_POOL\n 612:\t\tselect NET_SHAPER\n 613:\t\thelp\n 614:\t\t  This driver is a developer testing tool and software model that can\n 615:\t\t  be used to test various control path networking APIs, especially\n 616:\t\t  HW-offload related.\n 617:\t\n 618:\t\t  To compile this driver as a module, choose M here: the module\n 619:\t\t  will be called netdevsim.\n 620:\t\n 621:\tconfig NET_FAILOVER\n"
}

gemini-3.8-flash

null

null

							input: 34440
							output: 26
							thoughts: 48
						

Okay, here's my take on those configurations, thinking through them as I would when assessing their relevance:

**My Initial Assessment of Configuration Relevance**

Alright, let's see. My mind is immediately drawn to a few key configurations: `NETDEVSIM`, `INET_PSP`, and `TLS`. Based on my experience and initial understanding, these feel like they're directly related to the task at hand. However, I can't let it sit there. Something niggles... is there not something missing? Ah yes, `TCP_ULP`! Is it a configuration option? I'm pretty sure it is. Best to confirm that though, before proceeding any further.

{
  "Expression": "TCP_ULP",
  "PathPrefix": "net/"
}

{
  "Output": "net/ipv4/sysctl_net_ipv4.c=379=static int proc_tcp_available_ulp(const struct ctl_table *ctl,\n--\nnet/ipv4/sysctl_net_ipv4.c-382-{\nnet/ipv4/sysctl_net_ipv4.c:383:\tstruct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };\nnet/ipv4/sysctl_net_ipv4.c-384-\tint ret;\n--\nnet/ipv4/sysctl_net_ipv4.c-388-\t\treturn -ENOMEM;\nnet/ipv4/sysctl_net_ipv4.c:389:\ttcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);\nnet/ipv4/sysctl_net_ipv4.c-390-\tret = proc_dostring(\u0026tbl, write, buffer, lenp, ppos);\n--\nnet/ipv4/sysctl_net_ipv4.c=532=static struct ctl_table ipv4_table[] = {\n--\nnet/ipv4/sysctl_net_ipv4.c-606-\t\t.procname\t= \"tcp_available_ulp\",\nnet/ipv4/sysctl_net_ipv4.c:607:\t\t.maxlen\t\t= TCP_ULP_BUF_MAX,\nnet/ipv4/sysctl_net_ipv4.c-608-\t\t.mode\t\t= 0444,\n--\nnet/ipv4/tcp.c=3836=int do_tcp_setsockopt(struct sock *sk, int level, int optname,\n--\nnet/ipv4/tcp.c-3865-\t}\nnet/ipv4/tcp.c:3866:\tcase TCP_ULP: {\nnet/ipv4/tcp.c:3867:\t\tchar name[TCP_ULP_NAME_MAX];\nnet/ipv4/tcp.c-3868-\n--\nnet/ipv4/tcp.c-3872-\t\tval = strncpy_from_sockptr(name, optval,\nnet/ipv4/tcp.c:3873:\t\t\t\t\tmin_t(long, TCP_ULP_NAME_MAX - 1,\nnet/ipv4/tcp.c-3874-\t\t\t\t\t      optlen));\n--\nnet/ipv4/tcp.c=4480=int do_tcp_getsockopt(struct sock *sk, int level,\n--\nnet/ipv4/tcp.c-4597-\t}\nnet/ipv4/tcp.c:4598:\tcase TCP_ULP:\nnet/ipv4/tcp.c-4599-\t\tif (copy_from_sockptr(\u0026len, optlen, sizeof(int)))\nnet/ipv4/tcp.c-4600-\t\t\treturn -EFAULT;\nnet/ipv4/tcp.c:4601:\t\tlen = min_t(unsigned int, len, TCP_ULP_NAME_MAX);\nnet/ipv4/tcp.c-4602-\t\tif (!icsk-\u003eicsk_ulp_ops) {\n--\nnet/ipv4/tcp_diag.c=146=static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)\n--\nnet/ipv4/tcp_diag.c-174-\t\t\tsize += nla_total_size(0) +\nnet/ipv4/tcp_diag.c:175:\t\t\t\tnla_total_size(TCP_ULP_NAME_MAX);\nnet/ipv4/tcp_diag.c-176-\t\t\tif (ulp_ops-\u003eget_info_size)\n--\nnet/mptcp/sockopt.c=833=static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,\n--\nnet/mptcp/sockopt.c-839-\tswitch (optname) {\nnet/mptcp/sockopt.c:840:\tcase TCP_ULP:\nnet/mptcp/sockopt.c-841-\t\treturn -EOPNOTSUPP;\n--\nnet/mptcp/sockopt.c=1411=static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,\n--\nnet/mptcp/sockopt.c-1416-\tswitch (optname) {\nnet/mptcp/sockopt.c:1417:\tcase TCP_ULP:\nnet/mptcp/sockopt.c-1418-\tcase TCP_CONGESTION:\n--\nnet/smc/af_smc.c=3084=int smc_setsockopt(struct socket *sock, int level, int optname,\n--\nnet/smc/af_smc.c-3090-\nnet/smc/af_smc.c:3091:\tif (level == SOL_TCP \u0026\u0026 optname == TCP_ULP)\nnet/smc/af_smc.c-3092-\t\treturn -EOPNOTSUPP;\n--\nnet/tls/tls_main.c=50=MODULE_LICENSE(\"Dual BSD/GPL\");\nnet/tls/tls_main.c:51:MODULE_ALIAS_TCP_ULP(\"tls\");\nnet/tls/tls_main.c-52-\n"
}

gemini-3.8-flash

null

null

							input: 36011
							output: 182
							thoughts: 407
						

**My Assessment of the TCP_ULP, PSP, and TLS Integration**

Okay, let's break this down. From what I'm seeing, `TCP_ULP` is fundamentally integrated within the `net/ipv4` stack, under `CONFIG_INET`, as expected. To enable PSP, we need `CONFIG_INET_PSP`, and for TLS ULP, `CONFIG_TLS` is the key. Plus, for simulation and testing without real hardware, `CONFIG_NETDEVSIM` is available, which is very helpful.

Now, let's verify those `FocusSymbols`. I need to ensure these are specific to the relevant logic.
-   `sk_has_decrypt_user`: That's in `net/core/sock.c`. Seems to be tied to attaching ULPs and setting PSP RX associations. Okay, makes sense.
-   `tcp_set_ulp`: This is right where it should be, `net/ipv4/tcp_ulp.c`, and I'm seeing it relates to `setsockopt` with `TCP_ULP` or mptcp subflow socket creation.
-   `psp_sock_assoc_set_rx`: Found in `net/psp/psp_sock.c`. That's where I would expect it, and it's used during PSP RX association netlink requests. Good.
-   `psp_nl_rx_assoc_doit`: Finally, `net/psp/psp_nl.c` gives us the generic netlink handler for `PSP_CMD_RX_ASSOC`.

These symbols appear targeted and not globally ubiquitous in the code. `sk_has_decrypt_user` is not called anywhere that isn't ULP or PSP related, `tcp_set_ulp` only relates to `TCP_ULP` calls and mptcp subflows, `psp_sock_assoc_set_rx` just responds to PSP association netlink requests, and `psp_nl_rx_assoc_doit` is exclusively a PSP netlink handler.

I think that's it; nothing else is jumping out. The "WorthFuzzing" flag being set is accurate. I'm confident about these symbols. The `EnableConfigs` are sensible – `INET_PSP`, `TLS`, and `NETDEVSIM` – that all fits. And the `FocusSymbols` are correct. This looks complete and well justified. All good. Let's call `set-results`.

{
  "EnableConfigs": [
    "INET_PSP",
    "TLS",
    "NETDEVSIM"
  ],
  "FocusSymbols": [
    "sk_has_decrypt_user",
    "tcp_set_ulp",
    "psp_sock_assoc_set_rx",
    "psp_nl_rx_assoc_doit"
  ],
  "Reasoning": "The patch introduces mutual exclusion between TCP Upper Layer Protocols (such as kTLS) and PSP (PSP Security Protocol) socket associations by adding sk_has_decrypt_user() and enforcing checks in __tcp_set_ulp() and psp_sock_assoc_set_rx(). This modifies reachable core networking and socket state management logic testable via setsockopt(TCP_ULP) and PSP netlink commands (emulated via netdevsim).",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "INET_PSP",
    "TLS",
    "NETDEVSIM"
  ],
  "FocusSymbols": [
    "sk_has_decrypt_user",
    "tcp_set_ulp",
    "psp_sock_assoc_set_rx",
    "psp_nl_rx_assoc_doit"
  ],
  "Reasoning": "The patch introduces mutual exclusion between TCP Upper Layer Protocols (such as kTLS) and PSP (PSP Security Protocol) socket associations by adding sk_has_decrypt_user() and enforcing checks in __tcp_set_ulp() and psp_sock_assoc_set_rx(). This modifies reachable core networking and socket state management logic testable via setsockopt(TCP_ULP) and PSP netlink commands (emulated via netdevsim).",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

null

core

null

{
  "KMSANReasoning": "The patch introduces `sk_has_decrypt_user()` to enforce mutual exclusion between PSP (PSP association) and TCP ULP (such as kTLS), preventing both decryption offload/handling mechanisms from being configured on the same socket concurrently.\n\nThe changes only add conditional checks reading already initialized socket state pointers (`sk-\u003epsp_assoc` and `icsk-\u003eicsk_ulp_ops`) and returning `-EINVAL` when incompatible states are detected. There are no memory allocations, uninitialized variable accesses, data length/offset calculations, or copies to user space introduced or modified by this patch. Therefore, no uninitialized memory risks are present, and a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

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.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 2187e3aa158434c2ad583bf577a35cf4f9083f2a
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Sep 17 11:13:46 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/net/sock.h b/include/net/sock.h
index 51185222aac29..60ea55dc18854 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2312,6 +2312,8 @@ static inline void sk_gso_disable(struct sock *sk)
 	sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
 }
 
+bool sk_has_decrypt_user(const struct sock *sk);
+
 static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
 					   struct iov_iter *from, char *to,
 					   int copy, int offset)
diff --git a/net/core/sock.c b/net/core/sock.c
index fa60b7494c586..9489d9c479493 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -142,6 +142,7 @@
 
 #include <trace/events/sock.h>
 
+#include <net/psp.h>
 #include <net/tcp.h>
 #include <net/busy_poll.h>
 #include <net/phonet/phonet.h>
@@ -2670,6 +2671,12 @@ void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
 }
 EXPORT_SYMBOL_GPL(sk_setup_caps);
 
+bool sk_has_decrypt_user(const struct sock *sk)
+{
+	return psp_sk_assoc(sk) ||
+	       (sk_is_inet(sk) && inet_csk_has_ulp(sk)); /* for tls */
+}
+
 /*
  *	Simple resource managers for sockets.
  */
diff --git a/net/ipv4/tcp_ulp.c b/net/ipv4/tcp_ulp.c
index 2aa442128630e..b58045df101e5 100644
--- a/net/ipv4/tcp_ulp.c
+++ b/net/ipv4/tcp_ulp.c
@@ -136,6 +136,10 @@ static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)
 	if (icsk->icsk_ulp_ops)
 		goto out_err;
 
+	err = -EINVAL;
+	if (sk_has_decrypt_user(sk))
+		goto out_err;
+
 	if (sk->sk_socket)
 		clear_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
 
diff --git a/net/psp/psp_sock.c b/net/psp/psp_sock.c
index 1a2a6b7516b0f..e9b53eedf8dba 100644
--- a/net/psp/psp_sock.c
+++ b/net/psp/psp_sock.c
@@ -143,6 +143,10 @@ int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,
 		NL_SET_ERR_MSG(extack, "Socket already has PSP state");
 		err = -EBUSY;
 		goto exit_unlock;
+	} else if (sk_has_decrypt_user(sk)) {
+		NL_SET_ERR_MSG(extack, "Socket has incompatible state");
+		err = -EINVAL;
+		goto exit_unlock;
 	}
 
 	refcount_inc(&pas->refcnt);
diff --git a/tools/testing/selftests/drivers/net/config b/tools/testing/selftests/drivers/net/config
index b6989c7d3d9d1..4838adf27fa1b 100644
--- a/tools/testing/selftests/drivers/net/config
+++ b/tools/testing/selftests/drivers/net/config
@@ -21,5 +21,6 @@ CONFIG_NET_SCH_INGRESS=y
 CONFIG_NET_SCH_PRIO=m
 CONFIG_PPP=y
 CONFIG_PPPOE=y
+CONFIG_TLS=y
 CONFIG_VLAN_8021Q=m
 CONFIG_XDP_SOCKETS=y
diff --git a/tools/testing/selftests/drivers/net/psp.py b/tools/testing/selftests/drivers/net/psp.py
index 315648a770d00..a5b1e14f120f0 100755
--- a/tools/testing/selftests/drivers/net/psp.py
+++ b/tools/testing/selftests/drivers/net/psp.py
@@ -23,6 +23,8 @@ from lib.py import NetNSEnter
 from lib.py import bkg, rand_port, wait_port_listen
 from lib.py import ip
 
+TCP_ULP = 31
+
 
 def _get_outq(s):
     one = b'\0' * 4
@@ -333,6 +335,50 @@ def assoc_version_mismatch(cfg):
             ksft_eq(the_exception.nl_msg.error, -errno.EINVAL)
 
 
+def _require_tls_ulp():
+    with socket.create_server(("localhost", 0)) as srv, \
+         socket.create_connection(srv.getsockname()) as s:
+        try:
+            s.setsockopt(socket.SOL_TCP, TCP_ULP, b"tls")
+        except OSError as exc:
+            raise KsftSkipEx("kTLS not available") from exc
+
+
+def assoc_psp_ulp_exclusive(cfg):
+    """ Test that a TCP ULP cannot be attached to a PSP socket """
+    _init_psp_dev(cfg)
+    _require_tls_ulp()
+
+    with _make_clr_conn(cfg) as s:
+        try:
+            cfg.pspnl.rx_assoc({"version": 0,
+                                "dev-id": cfg.psp_dev_id,
+                                "sock-fd": s.fileno()})
+            with ksft_raises(OSError) as cm:
+                s.setsockopt(socket.SOL_TCP, TCP_ULP, b"tls")
+            ksft_eq(cm.exception.errno, errno.EINVAL)
+        finally:
+            _close_conn(cfg, s)
+
+
+def assoc_ulp_psp_exclusive(cfg):
+    """ Test that a PSP assoc cannot be added to a socket with a TCP ULP """
+    _init_psp_dev(cfg)
+    _require_tls_ulp()
+
+    with _make_clr_conn(cfg) as s:
+        try:
+            s.setsockopt(socket.SOL_TCP, TCP_ULP, b"tls")
+            with ksft_raises(NlError) as cm:
+                cfg.pspnl.rx_assoc({"version": 0,
+                                    "dev-id": cfg.psp_dev_id,
+                                    "sock-fd": s.fileno()})
+            ksft_eq(cm.exception.nl_msg.error, -errno.EINVAL)
+            ksft_eq(cm.exception.nl_msg.extack['bad-attr'], ".sock-fd")
+        finally:
+            _close_conn(cfg, s)
+
+
 def assoc_twice(cfg):
     """ Test reusing Tx assoc for two sockets """
     _init_psp_dev(cfg)

gemini-3.8-flash

null

null

							input: 3848
							output: 19
							thoughts: 363
						

**My Analysis of the Network Code Patch**

Okay, so this patch is aimed at preventing some undesirable interactions within the networking stack. Specifically, it's about enforcing a restriction where you can't attach a TCP ULP (like kTLS) to a socket that's already associated with a PSP-based socket or, conversely, attach PSP receive functionality to a socket that *already* has a TCP ULP configured. That makes sense, avoiding potential conflicts and ensuring proper handling within the kernel's networking layers.

Let's break down the changes. The first change is in `include/net/sock.h`: a new function `sk_has_decrypt_user(const struct sock *sk)` is declared. This function is key. Its purpose is presumably to determine if a socket has a "decrypt user" associated with it, where "decrypt user" seems to imply either PSP association or the use of a TCP ULP for TLS.

The definition of `sk_has_decrypt_user` is added in `net/core/sock.c`. Here it looks for either a PSP association via `psp_sk_assoc(sk)` or, for IPv4 sockets, checks if it has a TCP ULP via `inet_csk_has_ulp(sk)`. This is a crucial check; if either is true, then `sk_has_decrypt_user` returns `true`.

Next, in `net/ipv4/tcp_ulp.c`, within the `__tcp_set_ulp` function, a check is introduced: `if (sk_has_decrypt_user(sk))`. If that returns `true`, indicating the socket is already handling decryption, the new ULP attachment is rejected with an `-EINVAL` error. This prevents conflicting ULP attachments, ensuring only one is active at a time.

Similar protection is added within `net/psp/psp_sock.c`, specifically in `psp_sock_assoc_set_rx`. If a socket attempts to use PSP rx and *already* has a decrypt user (meaning a TCP ULP is active), an error is returned. That's good, explicitly blocking the illegal state.

Finally, there are updates to the selftests. No doubt the new tests are verifying the restrictions imposed by this patch, making sure the code behaves as expected and that attempts to create these invalid configurations are caught and reported correctly.

Now, let's drill down and see how `psp_sk_assoc` and `inet_csk_has_ulp` are *actually* defined. I'll use grepper to see where their definitions are and exactly how they determine the state of the socket. Understanding those functions will be essential to understanding the full implications of this change and confirming its correctness.

{
  "Expression": "psp_sk_assoc"
}

{
  "Output": "include/net/psp/functions.h=33=unsigned int psp_key_size(u32 version);\ninclude/net/psp/functions.h:34:void psp_sk_assoc_free(struct sock *sk);\ninclude/net/psp/functions.h-35-void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk);\n--\ninclude/net/psp/functions.h=37=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb);\ninclude/net/psp/functions.h-38-\ninclude/net/psp/functions.h:39:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-40-{\n--\ninclude/net/psp/functions.h=45=psp_enqueue_set_decrypted(struct sock *sk, struct sk_buff *skb)\n--\ninclude/net/psp/functions.h-48-\ninclude/net/psp/functions.h:49:\tpas = psp_sk_assoc(sk);\ninclude/net/psp/functions.h-50-\tif (pas \u0026\u0026 pas-\u003etx.spi)\n--\ninclude/net/psp/functions.h=116=psp_sk_rx_policy_check(struct sock *sk, struct sk_buff *skb)\ninclude/net/psp/functions.h-117-{\ninclude/net/psp/functions.h:118:\treturn __psp_sk_rx_policy_check(skb, psp_sk_assoc(sk));\ninclude/net/psp/functions.h-119-}\n--\ninclude/net/psp/functions.h=150=static inline unsigned int psp_sk_overhead(const struct sock *sk)\n--\ninclude/net/psp/functions.h-157-#else\ninclude/net/psp/functions.h:158:static inline void psp_sk_assoc_free(struct sock *sk) { }\ninclude/net/psp/functions.h-159-static inline void\n--\ninclude/net/psp/functions.h=163=psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb) { }\ninclude/net/psp/functions.h-164-\ninclude/net/psp/functions.h:165:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-166-{\n--\nnet/core/sock.c=2674=bool sk_has_decrypt_user(const struct sock *sk)\nnet/core/sock.c-2675-{\nnet/core/sock.c:2676:\treturn psp_sk_assoc(sk) ||\nnet/core/sock.c-2677-\t       (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)); /* for tls */\n--\nnet/ipv4/af_inet.c=140=void inet_sock_destruct(struct sock *sk)\n--\nnet/ipv4/af_inet.c-166-\tdst_release(rcu_dereference_protected(sk-\u003esk_rx_dst, 1));\nnet/ipv4/af_inet.c:167:\tpsp_sk_assoc_free(sk);\nnet/ipv4/af_inet.c-168-}\n--\nnet/psp/psp_sock.c=118=void psp_assoc_put(struct psp_assoc *pas)\n--\nnet/psp/psp_sock.c-123-\nnet/psp/psp_sock.c:124:void psp_sk_assoc_free(struct sock *sk)\nnet/psp/psp_sock.c-125-{\n--\nnet/psp/psp_sock.c=132=int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n--\nnet/psp/psp_sock.c-141-\nnet/psp/psp_sock.c:142:\tif (psp_sk_assoc(sk)) {\nnet/psp/psp_sock.c-143-\t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n--\nnet/psp/psp_sock.c=181=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp_sock.c-190-\nnet/psp/psp_sock.c:191:\tpas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-192-\tif (!pas) {\n--\nnet/psp/psp_sock.c=270=void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk)\nnet/psp/psp_sock.c-271-{\nnet/psp/psp_sock.c:272:\tstruct psp_assoc *pas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-273-\n"
}

gemini-3.8-flash

null

null

							input: 6106
							output: 22
							thoughts: 14
						

Here's my take on those thoughts, from my perspective as an expert:

**Investigating `inet_csk_has_ulp`**

Okay, so I'm thinking about `inet_csk_has_ulp`. That function is crucial in the connection setup process for IPv4 sockets using the Common Sockets Kernel (CSK) layer, particularly when dealing with User-Level Protocols (ULPs). I need to check its implementation, and how and when it's called. My primary focus is likely understanding how the ULP information is associated with a connection, and how the kernel determines if a specific ULP is in use during the connection establishment. Knowing this will help me trace a connection to see what specific ULP is associated with it, or troubleshoot issues if one isn't associated, or is incorrectly associated. Understanding the relationship between the `inet_connection_sock`, and the `ulp` field within it, is the goal here. It is used to determine whether or not a ULP (User Level Protocol) is attached to a connection or not. This is critical in the context of advanced networking and custom protocols. Time to dive in!

{
  "Expression": "inet_csk_has_ulp"
}

{
  "Output": "include/net/inet_connection_sock.h=338=static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)\n--\ninclude/net/inet_connection_sock.h-345-\ninclude/net/inet_connection_sock.h:346:static inline bool inet_csk_has_ulp(const struct sock *sk)\ninclude/net/inet_connection_sock.h-347-{\n--\nnet/core/skmsg.c=750=struct sk_psock *sk_psock_init(struct sock *sk, int node)\n--\nnet/core/skmsg.c-756-\nnet/core/skmsg.c:757:\tif (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)) {\nnet/core/skmsg.c-758-\t\tpsock = ERR_PTR(-EINVAL);\n--\nnet/core/sock.c=2674=bool sk_has_decrypt_user(const struct sock *sk)\n--\nnet/core/sock.c-2676-\treturn psp_sk_assoc(sk) ||\nnet/core/sock.c:2677:\t       (sk_is_inet(sk) \u0026\u0026 inet_csk_has_ulp(sk)); /* for tls */\nnet/core/sock.c-2678-}\n--\nnet/ipv4/tcp_bpf.c=725=int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)\n--\nnet/ipv4/tcp_bpf.c-734-\tif (restore) {\nnet/ipv4/tcp_bpf.c:735:\t\tif (inet_csk_has_ulp(sk)) {\nnet/ipv4/tcp_bpf.c-736-\t\t\t/* TLS does not have an unhash proto in SW cases,\n"
}

gemini-3.8-flash

null

null

							input: 6867
							output: 37
							thoughts: 15
						

Here's a summary of my thought process, as if I were considering that function:

**Analyzing `psp_sock_assoc_set_rx`**

Okay, let's take a look at `psp_sock_assoc_set_rx`. This likely deals with setting up the receive-side association for a socket within the PSP (presumably Packet Stream Processing or similar). Given the naming convention, it's probably part of a low-level network stack. I need to understand what this function does at a granular level. Is it associating a socket with a specific receive queue or buffer? Does it configure filtering criteria? Are there any data structures this function manipulates that would be of interest in a security context? Any potential race conditions? I should check the surrounding code for how this function is *used* to understand its purpose and context. I'll need to look at any associated documentation as well, just to clarify any assumptions I might make. This is a critical point that requires careful consideration. I am now going to examine that function in the code.

{
  "File": "net/psp/psp_sock.c",
  "FirstLine": 130,
  "LineCount": 40
}

{
  "Contents": " 130:\t}\n 131:\t\n 132:\tint psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n 133:\t\t\t\t  struct psp_key_parsed *key,\n 134:\t\t\t\t  struct netlink_ext_ack *extack)\n 135:\t{\n 136:\t\tint err;\n 137:\t\n 138:\t\tmemcpy(\u0026pas-\u003erx, key, sizeof(*key));\n 139:\t\n 140:\t\tlock_sock(sk);\n 141:\t\n 142:\t\tif (psp_sk_assoc(sk)) {\n 143:\t\t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n 144:\t\t\terr = -EBUSY;\n 145:\t\t\tgoto exit_unlock;\n 146:\t\t} else if (sk_has_decrypt_user(sk)) {\n 147:\t\t\tNL_SET_ERR_MSG(extack, \"Socket has incompatible state\");\n 148:\t\t\terr = -EINVAL;\n 149:\t\t\tgoto exit_unlock;\n 150:\t\t}\n 151:\t\n 152:\t\trefcount_inc(\u0026pas-\u003erefcnt);\n 153:\t\trcu_assign_pointer(sk-\u003epsp_assoc, pas);\n 154:\t\terr = 0;\n 155:\t\n 156:\texit_unlock:\n 157:\t\trelease_sock(sk);\n 158:\t\n 159:\t\treturn err;\n 160:\t}\n 161:\t\n 162:\tstatic int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n 163:\t{\n 164:\t\tstruct psp_skb_ext *pse;\n 165:\t\tstruct sk_buff *skb;\n 166:\t\n 167:\t\tskb_rbtree_walk(skb, \u0026tcp_sk(sk)-\u003eout_of_order_queue) {\n 168:\t\t\tpse = skb_ext_find(skb, SKB_EXT_PSP);\n 169:\t\t\tif (!psp_pse_matches_pas(pse, pas))\n"
}

gemini-3.8-flash

null

null

							input: 7737
							output: 38
							thoughts: 12
						

Here's my attempt at summarizing the thought process, tailored for an expert audience and written in the first person:

**Diving into `__tcp_set_ulp`**

Okay, so I need to take a look at `__tcp_set_ulp`. Right, let's see what's going on in there. I'm assuming this is related to User-Level Protocol (ULP) configuration within the TCP stack, so likely a key part of how applications interact with the TCP protocol at a finer grain, and potentially manage offloading or specific features like transport protocol selection. My initial hunch is this is the low-level function that links a specific ULP implementation with a particular TCP socket. I'll need to verify if it manages the socket options and control path for ULP, or perhaps it just deals with setting up the internal data structures that manage the mapping. I need to understand what this function does with the socket's internal data structures, if it touches the flow control or congestion control settings, or even if it modifies the transmission policy directly. Let's see if this function is responsible for the actual binding of the ULP's control function to a specific socket. Or is it merely setting an internal flag, with some other function responsible for the binding operation? That's what I'll be looking for.

{
  "File": "net/ipv4/tcp_ulp.c",
  "FirstLine": 125,
  "LineCount": 40
}

{
  "Contents": " 125:\t\tmodule_put(icsk-\u003eicsk_ulp_ops-\u003eowner);\n 126:\t\n 127:\t\ticsk-\u003eicsk_ulp_ops = NULL;\n 128:\t}\n 129:\t\n 130:\tstatic int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)\n 131:\t{\n 132:\t\tstruct inet_connection_sock *icsk = inet_csk(sk);\n 133:\t\tint err;\n 134:\t\n 135:\t\terr = -EEXIST;\n 136:\t\tif (icsk-\u003eicsk_ulp_ops)\n 137:\t\t\tgoto out_err;\n 138:\t\n 139:\t\terr = -EINVAL;\n 140:\t\tif (sk_has_decrypt_user(sk))\n 141:\t\t\tgoto out_err;\n 142:\t\n 143:\t\tif (sk-\u003esk_socket)\n 144:\t\t\tclear_bit(SOCK_SUPPORT_ZC, \u0026sk-\u003esk_socket-\u003eflags);\n 145:\t\n 146:\t\terr = -ENOTCONN;\n 147:\t\tif (!ulp_ops-\u003eclone \u0026\u0026 sk-\u003esk_state == TCP_LISTEN)\n 148:\t\t\tgoto out_err;\n 149:\t\n 150:\t\terr = ulp_ops-\u003einit(sk);\n 151:\t\tif (err)\n 152:\t\t\tgoto out_err;\n 153:\t\n 154:\t\ticsk-\u003eicsk_ulp_ops = ulp_ops;\n 155:\t\treturn 0;\n 156:\tout_err:\n 157:\t\tmodule_put(ulp_ops-\u003eowner);\n 158:\t\treturn err;\n 159:\t}\n 160:\t\n 161:\tint tcp_set_ulp(struct sock *sk, const char *name)\n 162:\t{\n 163:\t\tconst struct tcp_ulp_ops *ulp_ops;\n 164:\t\n"
}

gemini-3.8-flash

null

null

							input: 8624
							output: 170
							thoughts: 829
						

**Analyzing the Patch for Uninitialized Memory Risks**

Okay, let's break this down. This patch is essentially adding a mutual exclusion check using `sk_has_decrypt_user(sk)`. This function is making sure a socket can't have both a PSP association *and* a TCP ULP (like kTLS) simultaneously. It achieves this by checking `psp_sk_assoc(sk)` and `sk_is_inet(sk) && inet_csk_has_ulp(sk)`. If either is true, the ULP or PSP association is rejected, respectively, during setting.

Now, my main concern is whether this introduces any uninitialized memory risks, and I need to methodically check for them:

1.  **Kernel structures exposed to user space:** No, there's no data copying or structure exposure to user space happening here. We're not sending any new structures or modified data through `copy_to_user`, `put_user`, netlink, ioctls, socket options, or BPF buffers. So this is not an issue.
2.  **Uninitialized variables in conditional logic:** Nope. `sk_has_decrypt_user(sk)` is reading `sk->psp_assoc` and `icsk->icsk_ulp_ops`. These are standard socket fields, which are initialized when the socket is created. The check is on initialized values.
3.  **Complex data structure initialization:** No, the patch doesn't involve any new complex data structure allocation or initialization where uninitialized fields could be a problem later.
4.  **Bounds checks or length issues:** No. This code is only restricting the setting of ULP or PSP state on existing sockets based on whether they *already* have one or the other set. It's not messing with buffer lengths or potentially exposing uninitialized bytes.

So, from what I can see, there's no KMSAN-detectable uninitialized memory risk here. The check is purely a state validation and mutual exclusion check between PSP and TCP ULP.

And remember the distinction between KASAN and KMSAN. Standard KASAN builds catch most issues. KMSAN is for detecting *reads* of uninitialized memory and kernel-to-user memory leaks. KMSAN is expensive, and should only be used if there's no other way to detect the problem. Since this patch doesn't allocate or expose uninitialized memory, KASAN and/or LOCKDEP (if there's a concurrency issue) would suffice. So, `NeedsKMSAN` is clearly false.

In summary, this patch is introducing a mutual exclusion mechanism, not an uninitialized memory risk. We are good to go. Let's call it `set-results`.

{
  "KMSANReasoning": "The patch introduces `sk_has_decrypt_user()` to enforce mutual exclusion between PSP (PSP association) and TCP ULP (such as kTLS), preventing both decryption offload/handling mechanisms from being configured on the same socket concurrently.\n\nThe changes only add conditional checks reading already initialized socket state pointers (`sk-\u003epsp_assoc` and `icsk-\u003eicsk_ulp_ops`) and returning `-EINVAL` when incompatible states are detected. There are no memory allocations, uninitialized variable accesses, data length/offset calculations, or copies to user space introduced or modified by this patch. Therefore, no uninitialized memory risks are present, and a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch introduces `sk_has_decrypt_user()` to enforce mutual exclusion between PSP (PSP association) and TCP ULP (such as kTLS), preventing both decryption offload/handling mechanisms from being configured on the same socket concurrently.\n\nThe changes only add conditional checks reading already initialized socket state pointers (`sk-\u003epsp_assoc` and `icsk-\u003eicsk_ulp_ops`) and returning `-EINVAL` when incompatible states are detected. There are no memory allocations, uninitialized variable accesses, data length/offset calculations, or copies to user space introduced or modified by this patch. Therefore, no uninitialized memory risks are present, and a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}