| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/09/05 10:51 | flow | patch-triage |
1mArgs:null Results: {
"EnableConfigs": [
"INET_PSP",
"NETDEVSIM"
],
"FocusSymbols": [
"psp_sock_assoc_set_tx",
"psp_sock_set_tx_key",
"psp_dev_tx_key_add",
"psp_dev_tx_key_del",
"psp_assoc_free",
"psp_dev_create",
"psp_dev_unregister",
"nsim_do_psp"
],
"KMSANReasoning": "The patch makes the `tx_key_add` and `tx_key_del` driver callbacks optional for PSP devices without SADB support, refactoring Tx key association management and removing unused key handling hooks from netdevsim. All allocated data structures continue to be fully zero-initialized via `kzalloc_flex`, `kzalloc_obj`, or `kmemdup`. The changes do not introduce or expose uninitialized memory, info-leaks, or reads of uninitialized struct fields. Any potential issues with pointer checks, list manipulation, or lifecycle handling fall strictly under the domain of KASAN and LOCKDEP. Therefore, dedicated KMSAN fuzzing is not warranted.",
"NeedsKMSAN": false,
"Reasoning": "The patch modifies core networking PSP (PSP Security Protocol) subsystem logic and netdevsim device driver code. It makes Tx key offload callbacks optional for devices without SADB, refactors key allocation/deallocation in psp_sock.c, updates device registration checks in psp_main.c, and removes obsolete assoc tracking in netdevsim. These code paths are fully reachable via netlink commands and netdevsim interfaces in standard QEMU environments.",
"WorthFuzzing": true
} |
| 1/1 | 2026/09/05 10:51 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 2702790def9417fe11fe7245d887573e871af31b\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sat Sep 5 10:51:50 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h\nindex 55aec41237b9b..181b6baaba7af 100644\n--- a/drivers/net/netdevsim/netdevsim.h\n+++ b/drivers/net/netdevsim/netdevsim.h\n@@ -122,7 +122,6 @@ struct netdevsim {\n \t\tstruct dentry *rereg;\n \t\tstruct mutex rereg_lock;\n \t\tu32 spi;\n-\t\tu32 assoc_cnt;\n \t} psp;\n \n \tstruct nsim_bus_dev *nsim_bus_dev;\ndiff --git a/drivers/net/netdevsim/psp.c b/drivers/net/netdevsim/psp.c\nindex 6b3532b5e360d..b7452c49b581d 100644\n--- a/drivers/net/netdevsim/psp.c\n+++ b/drivers/net/netdevsim/psp.c\n@@ -23,7 +23,6 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,\n \tstruct psp_assoc *pas;\n \tstruct net *net;\n \tint psp_len;\n-\tvoid **ptr;\n \n \trcu_read_lock();\n \tpas = psp_skb_get_assoc_rcu(skb);\n@@ -37,12 +36,6 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,\n \t\tgoto out_unlock;\n \t}\n \n-\tptr = psp_assoc_drv_data(pas);\n-\tif (*ptr != ns) {\n-\t\trc = SKB_DROP_REASON_PSP_OUTPUT;\n-\t\tgoto out_unlock;\n-\t}\n-\n \tnet = sock_net(skb-\u003esk);\n \tif (!psp_dev_encapsulate(net, skb, pas-\u003etx.spi, pas-\u003eversion, 0)) {\n \t\trc = SKB_DROP_REASON_PSP_OUTPUT;\n@@ -149,19 +142,6 @@ nsim_rx_spi_alloc(struct psp_dev *psd, u32 version,\n \treturn 0;\n }\n \n-static int nsim_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,\n-\t\t\t struct netlink_ext_ack *extack)\n-{\n-\tstruct netdevsim *ns = psd-\u003edrv_priv;\n-\tvoid **ptr = psp_assoc_drv_data(pas);\n-\n-\t/* Copy drv_priv from psd to assoc */\n-\t*ptr = psd-\u003edrv_priv;\n-\tns-\u003epsp.assoc_cnt++;\n-\n-\treturn 0;\n-}\n-\n static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)\n {\n \tstruct netdevsim *ns = psd-\u003edrv_priv;\n@@ -177,15 +157,6 @@ static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)\n \treturn 0;\n }\n \n-static void nsim_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)\n-{\n-\tstruct netdevsim *ns = psd-\u003edrv_priv;\n-\tvoid **ptr = psp_assoc_drv_data(pas);\n-\n-\t*ptr = NULL;\n-\tns-\u003epsp.assoc_cnt--;\n-}\n-\n static void nsim_get_stats(struct psp_dev *psd, struct psp_dev_stats *stats)\n {\n \tstruct netdevsim *ns = psd-\u003edrv_priv;\n@@ -204,8 +175,6 @@ static void nsim_get_stats(struct psp_dev *psd, struct psp_dev_stats *stats)\n static struct psp_dev_ops nsim_psp_ops = {\n \t.set_config\t= nsim_psp_set_config,\n \t.rx_spi_alloc\t= nsim_rx_spi_alloc,\n-\t.tx_key_add\t= nsim_assoc_add,\n-\t.tx_key_del\t= nsim_assoc_del,\n \t.key_rotate\t= nsim_key_rotate,\n \t.get_stats\t= nsim_get_stats,\n };\n@@ -215,7 +184,6 @@ static struct psp_dev_caps nsim_psp_caps = {\n \t\t 1 \u003c\u003c PSP_VERSION_HDR0_AES_GMAC_128 |\n \t\t 1 \u003c\u003c PSP_VERSION_HDR0_AES_GCM_256 |\n \t\t 1 \u003c\u003c PSP_VERSION_HDR0_AES_GMAC_256,\n-\t.assoc_drv_spc = sizeof(void *),\n };\n \n static void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)\n@@ -230,7 +198,6 @@ static void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)\n \t\tsynchronize_rcu();\n \t\tpsp_dev_unregister(psd);\n \t}\n-\tWARN_ON(ns-\u003epsp.assoc_cnt);\n }\n \n void nsim_psp_uninit(struct netdevsim *ns)\ndiff --git a/include/net/psp/functions.h b/include/net/psp/functions.h\nindex c5c23a54774e6..b23c30898389c 100644\n--- a/include/net/psp/functions.h\n+++ b/include/net/psp/functions.h\n@@ -24,11 +24,6 @@ int psp_dev_rcv(struct sk_buff *skb, u16 dev_id, u8 generation, bool strip_icv);\n /* Kernel-facing API */\n void psp_assoc_put(struct psp_assoc *pas);\n \n-static inline void *psp_assoc_drv_data(struct psp_assoc *pas)\n-{\n-\treturn pas-\u003edrv_data;\n-}\n-\n #if IS_ENABLED(CONFIG_INET_PSP)\n unsigned int psp_key_size(u32 version);\n void psp_sk_assoc_free(struct sock *sk);\ndiff --git a/include/net/psp/types.h b/include/net/psp/types.h\nindex 87991a1ea02d0..b8905efbd604e 100644\n--- a/include/net/psp/types.h\n+++ b/include/net/psp/types.h\n@@ -219,12 +219,16 @@ struct psp_dev_ops {\n \t * @tx_key_add: add a Tx key to the device\n \t * Install an association in the device. Core will allocate space\n \t * for the driver to use at drv_data.\n+\t * Can be left NULL if device does not store Tx keys and @tx_key_del\n+\t * is also NULL.\n \t */\n \tint (*tx_key_add)(struct psp_dev *psd, struct psp_assoc *pas,\n \t\t\t struct netlink_ext_ack *extack);\n \t/**\n \t * @tx_key_del: remove a Tx key from the device\n \t * Remove an association from the device.\n+\t * Can be left NULL if device does not store Tx keys and @tx_key_add\n+\t * is also NULL.\n \t */\n \tvoid (*tx_key_del)(struct psp_dev *psd, struct psp_assoc *pas);\n \ndiff --git a/net/psp/psp.h b/net/psp/psp.h\nindex 86eeba823ced1..bbb39e2f5b0ab 100644\n--- a/net/psp/psp.h\n+++ b/net/psp/psp.h\n@@ -53,4 +53,16 @@ static inline bool psp_dev_is_registered(struct psp_dev *psd)\n \treturn !!psd-\u003eops;\n }\n \n+static inline bool psp_dev_has_sadb(struct psp_dev *psd)\n+{\n+\tlockdep_assert_held(\u0026psd-\u003elock);\n+\treturn !!psd-\u003eops-\u003etx_key_del;\n+}\n+\n+static inline bool psp_assoc_needs_tx_key_del(struct psp_assoc *pas)\n+{\n+\tlockdep_assert_held(\u0026pas-\u003epsd-\u003elock);\n+\treturn psp_dev_has_sadb(pas-\u003epsd) \u0026\u0026 pas-\u003etx.spi;\n+}\n+\n #endif /* __PSP_PSP_H */\ndiff --git a/net/psp/psp_main.c b/net/psp/psp_main.c\nindex c9c1a8826b7f9..91473f96ad211 100644\n--- a/net/psp/psp_main.c\n+++ b/net/psp/psp_main.c\n@@ -68,9 +68,9 @@ psp_dev_create(struct net_device *netdev,\n \t\t !psd_ops-\u003eset_config ||\n \t\t !psd_ops-\u003ekey_rotate ||\n \t\t !psd_ops-\u003erx_spi_alloc ||\n-\t\t !psd_ops-\u003etx_key_add ||\n-\t\t !psd_ops-\u003etx_key_del ||\n-\t\t !psd_ops-\u003eget_stats))\n+\t\t !psd_ops-\u003eget_stats ||\n+\t\t (!psd_ops-\u003etx_key_add != !psd_ops-\u003etx_key_del) ||\n+\t\t (psd_caps-\u003eassoc_drv_spc \u0026\u0026 !psd_ops-\u003etx_key_add)))\n \t\treturn ERR_PTR(-EINVAL);\n \n \tpsd = kzalloc_obj(*psd);\n@@ -147,8 +147,11 @@ void psp_dev_unregister(struct psp_dev *psd)\n \n \tlist_splice_init(\u0026psd-\u003eactive_assocs, \u0026psd-\u003eprev_assocs);\n \tlist_splice_init(\u0026psd-\u003eprev_assocs, \u0026psd-\u003estale_assocs);\n-\tlist_for_each_entry_safe(pas, next, \u0026psd-\u003estale_assocs, assocs_list)\n-\t\tpsp_dev_tx_key_del(psd, pas);\n+\tlist_for_each_entry_safe(pas, next, \u0026psd-\u003estale_assocs, assocs_list) {\n+\t\tif (psp_assoc_needs_tx_key_del(pas))\n+\t\t\tpsp_dev_tx_key_del(psd, pas);\n+\t\tlist_del(\u0026pas-\u003eassocs_list);\n+\t}\n \n \tlist_for_each_entry_safe(entry, entry_tmp, \u0026psd-\u003eassoc_dev_list,\n \t\t\t\t dev_list) {\ndiff --git a/net/psp/psp_sock.c b/net/psp/psp_sock.c\nindex 1a2a6b7516b0f..6a4becc38b55a 100644\n--- a/net/psp/psp_sock.c\n+++ b/net/psp/psp_sock.c\n@@ -78,16 +78,33 @@ static struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)\n }\n \n static int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,\n+\t\t\t struct psp_key_parsed *key,\n \t\t\t struct netlink_ext_ack *extack)\n {\n-\treturn psd-\u003eops-\u003etx_key_add(psd, pas, extack);\n+\tstruct psp_assoc *dummy;\n+\tint err;\n+\n+\t/* Pass a fake association to drivers to make sure they don't\n+\t * try to store pointers to it. For re-keying we'll need to\n+\t * re-allocate the assoc structures.\n+\t */\n+\tdummy = psp_assoc_dummy(pas);\n+\tif (!dummy)\n+\t\treturn -ENOMEM;\n+\n+\tmemcpy(\u0026dummy-\u003etx, key, sizeof(*key));\n+\terr = psd-\u003eops-\u003etx_key_add(psd, dummy, extack);\n+\tif (!err)\n+\t\tmemcpy(pas-\u003edrv_data, dummy-\u003edrv_data,\n+\t\t psd-\u003ecaps-\u003eassoc_drv_spc);\n+\n+\tkfree(dummy);\n+\treturn err;\n }\n \n void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)\n {\n-\tif (pas-\u003etx.spi)\n-\t\tpsd-\u003eops-\u003etx_key_del(psd, pas);\n-\tlist_del(\u0026pas-\u003eassocs_list);\n+\tpsd-\u003eops-\u003etx_key_del(psd, pas);\n }\n \n static void psp_assoc_free(struct work_struct *work)\n@@ -96,8 +113,11 @@ static void psp_assoc_free(struct work_struct *work)\n \tstruct psp_dev *psd = pas-\u003epsd;\n \n \tmutex_lock(\u0026psd-\u003elock);\n-\tif (psp_dev_is_registered(psd))\n-\t\tpsp_dev_tx_key_del(psd, pas);\n+\tif (psp_dev_is_registered(psd)) {\n+\t\tif (psp_assoc_needs_tx_key_del(pas))\n+\t\t\tpsp_dev_tx_key_del(psd, pas);\n+\t\tlist_del(\u0026pas-\u003eassocs_list);\n+\t}\n \tmutex_unlock(\u0026psd-\u003elock);\n \tpsp_dev_put(psd);\n \tkfree(pas);\n@@ -155,6 +175,22 @@ int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n \treturn err;\n }\n \n+static int psp_assoc_set_tx(struct psp_dev *psd, struct psp_assoc *pas,\n+\t\t\t struct psp_key_parsed *key,\n+\t\t\t struct netlink_ext_ack *extack)\n+{\n+\tint err;\n+\n+\tif (psp_dev_has_sadb(psd)) {\n+\t\terr = psp_dev_tx_key_add(psd, pas, key, extack);\n+\t\tif (err)\n+\t\t\treturn err;\n+\t}\n+\n+\tmemcpy(\u0026pas-\u003etx, key, sizeof(*key));\n+\treturn 0;\n+}\n+\n static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n {\n \tstruct psp_skb_ext *pse;\n@@ -174,12 +210,40 @@ static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n \treturn 0;\n }\n \n+static int\n+psp_sock_set_tx_key(struct sock *sk, struct psp_dev *psd, struct psp_assoc *pas,\n+\t\t struct psp_key_parsed *key, struct netlink_ext_ack *extack)\n+{\n+\tstruct inet_connection_sock *icsk;\n+\tint err;\n+\n+\terr = psp_sock_recv_queue_check(sk, pas);\n+\tif (err) {\n+\t\tNL_SET_ERR_MSG(extack,\n+\t\t\t \"Socket has incompatible segments already in the recv queue\");\n+\t\treturn err;\n+\t}\n+\n+\terr = psp_assoc_set_tx(psd, pas, key, extack);\n+\tif (err)\n+\t\treturn err;\n+\n+\tWRITE_ONCE(sk-\u003esk_validate_xmit_skb, psp_validate_xmit);\n+\ttcp_write_collapse_fence(sk);\n+\tpas-\u003eupgrade_seq = tcp_sk(sk)-\u003ercv_nxt;\n+\n+\ticsk = inet_csk(sk);\n+\ticsk-\u003eicsk_ext_hdr_len += psp_sk_overhead(sk);\n+\ticsk-\u003eicsk_sync_mss(sk, icsk-\u003eicsk_pmtu_cookie);\n+\n+\treturn err;\n+}\n+\n int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n \t\t\t u32 version, struct psp_key_parsed *key,\n \t\t\t struct netlink_ext_ack *extack)\n {\n-\tstruct inet_connection_sock *icsk;\n-\tstruct psp_assoc *pas, *dummy;\n+\tstruct psp_assoc *pas;\n \tint err;\n \n \tlock_sock(sk);\n@@ -207,40 +271,7 @@ int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n \t\tgoto exit_unlock;\n \t}\n \n-\terr = psp_sock_recv_queue_check(sk, pas);\n-\tif (err) {\n-\t\tNL_SET_ERR_MSG(extack, \"Socket has incompatible segments already in the recv queue\");\n-\t\tgoto exit_unlock;\n-\t}\n-\n-\t/* Pass a fake association to drivers to make sure they don't\n-\t * try to store pointers to it. For re-keying we'll need to\n-\t * re-allocate the assoc structures.\n-\t */\n-\tdummy = psp_assoc_dummy(pas);\n-\tif (!dummy) {\n-\t\terr = -ENOMEM;\n-\t\tgoto exit_unlock;\n-\t}\n-\n-\tmemcpy(\u0026dummy-\u003etx, key, sizeof(*key));\n-\terr = psp_dev_tx_key_add(psd, dummy, extack);\n-\tif (err)\n-\t\tgoto exit_free_dummy;\n-\n-\tmemcpy(pas-\u003edrv_data, dummy-\u003edrv_data, psd-\u003ecaps-\u003eassoc_drv_spc);\n-\tmemcpy(\u0026pas-\u003etx, key, sizeof(*key));\n-\n-\tWRITE_ONCE(sk-\u003esk_validate_xmit_skb, psp_validate_xmit);\n-\ttcp_write_collapse_fence(sk);\n-\tpas-\u003eupgrade_seq = tcp_sk(sk)-\u003ercv_nxt;\n-\n-\ticsk = inet_csk(sk);\n-\ticsk-\u003eicsk_ext_hdr_len += psp_sk_overhead(sk);\n-\ticsk-\u003eicsk_sync_mss(sk, icsk-\u003eicsk_pmtu_cookie);\n-\n-exit_free_dummy:\n-\tkfree(dummy);\n+\terr = psp_sock_set_tx_key(sk, psd, pas, key, extack);\n exit_unlock:\n \trelease_sock(sk);\n \treturn err;\n"
} |
| 2/1 | 2026/09/05 10:51 | agent | patch-evaluator |
0mModel:core Args: null Results: {
"EnableConfigs": [
"INET_PSP",
"NETDEVSIM"
],
"FocusSymbols": [
"psp_sock_assoc_set_tx",
"psp_sock_set_tx_key",
"psp_dev_tx_key_add",
"psp_dev_tx_key_del",
"psp_assoc_free",
"psp_dev_create",
"psp_dev_unregister",
"nsim_do_psp"
],
"Reasoning": "The patch modifies core networking PSP (PSP Security Protocol) subsystem logic and netdevsim device driver code. It makes Tx key offload callbacks optional for devices without SADB, refactors key allocation/deallocation in psp_sock.c, updates device registration checks in psp_main.c, and removes obsolete assoc tracking in netdevsim. These code paths are fully reachable via netlink commands and netdevsim interfaces in standard QEMU environments.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.
IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.
================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.
- REACHABILITY IS THE PRIMARY GATE:
Fuzzing can only discover bugs in code that can actually execute in standard virtualized
environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
regardless of whether it adds assertions or complex logic.
- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
Patch authors routinely label changes as "cleanups", "refactorings", or state
"No functional change intended". Do NOT take these claims at face value.
Code refactorings that rearrange logic, introduce helper functions, or alter state management
in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
If reachable executable code is modified or refactored, it MUST be fuzzed.
- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
Even if the author believes the invariant always holds, fuzzing is essential to verify whether
an unusual sequence of operations can violate it.
================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:
- Non-kernel and non-executable changes:
* Modifications to Documentation/, comments, or spelling fixes.
* User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
that do not affect the compiled kernel image (vmlinux) or kernel modules.
* Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
that do not alter control flow or data structures.
* Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
* Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
* Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
physical PCI hot-unplug or manual sysfs driver unbinding.
* Code paths exclusive to architectures other than the target architecture.
================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
* Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
* Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
* Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
* Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).
================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:
- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
Do NOT list generic, ubiquitous functions called by almost every program in the corpus
(including, but not limited to: general memory allocators and deallocators, page fault
and trap handlers, or core synchronization primitives; this is not an exhaustive list).
Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
which severely dilutes fuzzing effort away from the actual changes.
- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
List functions that specifically implement the logic being added or altered, or direct API entrypoints
for the subsystem feature under review.
- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).
================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit 2702790def9417fe11fe7245d887573e871af31b
Author: syz-cluster <triage@syzkaller.com>
Date: Sat Sep 5 10:51:50 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 55aec41237b9b..181b6baaba7af 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -122,7 +122,6 @@ struct netdevsim {
struct dentry *rereg;
struct mutex rereg_lock;
u32 spi;
- u32 assoc_cnt;
} psp;
struct nsim_bus_dev *nsim_bus_dev;
diff --git a/drivers/net/netdevsim/psp.c b/drivers/net/netdevsim/psp.c
index 6b3532b5e360d..b7452c49b581d 100644
--- a/drivers/net/netdevsim/psp.c
+++ b/drivers/net/netdevsim/psp.c
@@ -23,7 +23,6 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,
struct psp_assoc *pas;
struct net *net;
int psp_len;
- void **ptr;
rcu_read_lock();
pas = psp_skb_get_assoc_rcu(skb);
@@ -37,12 +36,6 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,
goto out_unlock;
}
- ptr = psp_assoc_drv_data(pas);
- if (*ptr != ns) {
- rc = SKB_DROP_REASON_PSP_OUTPUT;
- goto out_unlock;
- }
-
net = sock_net(skb->sk);
if (!psp_dev_encapsulate(net, skb, pas->tx.spi, pas->version, 0)) {
rc = SKB_DROP_REASON_PSP_OUTPUT;
@@ -149,19 +142,6 @@ nsim_rx_spi_alloc(struct psp_dev *psd, u32 version,
return 0;
}
-static int nsim_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,
- struct netlink_ext_ack *extack)
-{
- struct netdevsim *ns = psd->drv_priv;
- void **ptr = psp_assoc_drv_data(pas);
-
- /* Copy drv_priv from psd to assoc */
- *ptr = psd->drv_priv;
- ns->psp.assoc_cnt++;
-
- return 0;
-}
-
static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)
{
struct netdevsim *ns = psd->drv_priv;
@@ -177,15 +157,6 @@ static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)
return 0;
}
-static void nsim_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)
-{
- struct netdevsim *ns = psd->drv_priv;
- void **ptr = psp_assoc_drv_data(pas);
-
- *ptr = NULL;
- ns->psp.assoc_cnt--;
-}
-
static void nsim_get_stats(struct psp_dev *psd, struct psp_dev_stats *stats)
{
struct netdevsim *ns = psd->drv_priv;
@@ -204,8 +175,6 @@ static void nsim_get_stats(struct psp_dev *psd, struct psp_dev_stats *stats)
static struct psp_dev_ops nsim_psp_ops = {
.set_config = nsim_psp_set_config,
.rx_spi_alloc = nsim_rx_spi_alloc,
- .tx_key_add = nsim_assoc_add,
- .tx_key_del = nsim_assoc_del,
.key_rotate = nsim_key_rotate,
.get_stats = nsim_get_stats,
};
@@ -215,7 +184,6 @@ static struct psp_dev_caps nsim_psp_caps = {
1 << PSP_VERSION_HDR0_AES_GMAC_128 |
1 << PSP_VERSION_HDR0_AES_GCM_256 |
1 << PSP_VERSION_HDR0_AES_GMAC_256,
- .assoc_drv_spc = sizeof(void *),
};
static void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)
@@ -230,7 +198,6 @@ static void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)
synchronize_rcu();
psp_dev_unregister(psd);
}
- WARN_ON(ns->psp.assoc_cnt);
}
void nsim_psp_uninit(struct netdevsim *ns)
diff --git a/include/net/psp/functions.h b/include/net/psp/functions.h
index c5c23a54774e6..b23c30898389c 100644
--- a/include/net/psp/functions.h
+++ b/include/net/psp/functions.h
@@ -24,11 +24,6 @@ int psp_dev_rcv(struct sk_buff *skb, u16 dev_id, u8 generation, bool strip_icv);
/* Kernel-facing API */
void psp_assoc_put(struct psp_assoc *pas);
-static inline void *psp_assoc_drv_data(struct psp_assoc *pas)
-{
- return pas->drv_data;
-}
-
#if IS_ENABLED(CONFIG_INET_PSP)
unsigned int psp_key_size(u32 version);
void psp_sk_assoc_free(struct sock *sk);
diff --git a/include/net/psp/types.h b/include/net/psp/types.h
index 87991a1ea02d0..b8905efbd604e 100644
--- a/include/net/psp/types.h
+++ b/include/net/psp/types.h
@@ -219,12 +219,16 @@ struct psp_dev_ops {
* @tx_key_add: add a Tx key to the device
* Install an association in the device. Core will allocate space
* for the driver to use at drv_data.
+ * Can be left NULL if device does not store Tx keys and @tx_key_del
+ * is also NULL.
*/
int (*tx_key_add)(struct psp_dev *psd, struct psp_assoc *pas,
struct netlink_ext_ack *extack);
/**
* @tx_key_del: remove a Tx key from the device
* Remove an association from the device.
+ * Can be left NULL if device does not store Tx keys and @tx_key_add
+ * is also NULL.
*/
void (*tx_key_del)(struct psp_dev *psd, struct psp_assoc *pas);
diff --git a/net/psp/psp.h b/net/psp/psp.h
index 86eeba823ced1..bbb39e2f5b0ab 100644
--- a/net/psp/psp.h
+++ b/net/psp/psp.h
@@ -53,4 +53,16 @@ static inline bool psp_dev_is_registered(struct psp_dev *psd)
return !!psd->ops;
}
+static inline bool psp_dev_has_sadb(struct psp_dev *psd)
+{
+ lockdep_assert_held(&psd->lock);
+ return !!psd->ops->tx_key_del;
+}
+
+static inline bool psp_assoc_needs_tx_key_del(struct psp_assoc *pas)
+{
+ lockdep_assert_held(&pas->psd->lock);
+ return psp_dev_has_sadb(pas->psd) && pas->tx.spi;
+}
+
#endif /* __PSP_PSP_H */
diff --git a/net/psp/psp_main.c b/net/psp/psp_main.c
index c9c1a8826b7f9..91473f96ad211 100644
--- a/net/psp/psp_main.c
+++ b/net/psp/psp_main.c
@@ -68,9 +68,9 @@ psp_dev_create(struct net_device *netdev,
!psd_ops->set_config ||
!psd_ops->key_rotate ||
!psd_ops->rx_spi_alloc ||
- !psd_ops->tx_key_add ||
- !psd_ops->tx_key_del ||
- !psd_ops->get_stats))
+ !psd_ops->get_stats ||
+ (!psd_ops->tx_key_add != !psd_ops->tx_key_del) ||
+ (psd_caps->assoc_drv_spc && !psd_ops->tx_key_add)))
return ERR_PTR(-EINVAL);
psd = kzalloc_obj(*psd);
@@ -147,8 +147,11 @@ void psp_dev_unregister(struct psp_dev *psd)
list_splice_init(&psd->active_assocs, &psd->prev_assocs);
list_splice_init(&psd->prev_assocs, &psd->stale_assocs);
- list_for_each_entry_safe(pas, next, &psd->stale_assocs, assocs_list)
- psp_dev_tx_key_del(psd, pas);
+ list_for_each_entry_safe(pas, next, &psd->stale_assocs, assocs_list) {
+ if (psp_assoc_needs_tx_key_del(pas))
+ psp_dev_tx_key_del(psd, pas);
+ list_del(&pas->assocs_list);
+ }
list_for_each_entry_safe(entry, entry_tmp, &psd->assoc_dev_list,
dev_list) {
diff --git a/net/psp/psp_sock.c b/net/psp/psp_sock.c
index 1a2a6b7516b0f..6a4becc38b55a 100644
--- a/net/psp/psp_sock.c
+++ b/net/psp/psp_sock.c
@@ -78,16 +78,33 @@ static struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)
}
static int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,
+ struct psp_key_parsed *key,
struct netlink_ext_ack *extack)
{
- return psd->ops->tx_key_add(psd, pas, extack);
+ struct psp_assoc *dummy;
+ int err;
+
+ /* Pass a fake association to drivers to make sure they don't
+ * try to store pointers to it. For re-keying we'll need to
+ * re-allocate the assoc structures.
+ */
+ dummy = psp_assoc_dummy(pas);
+ if (!dummy)
+ return -ENOMEM;
+
+ memcpy(&dummy->tx, key, sizeof(*key));
+ err = psd->ops->tx_key_add(psd, dummy, extack);
+ if (!err)
+ memcpy(pas->drv_data, dummy->drv_data,
+ psd->caps->assoc_drv_spc);
+
+ kfree(dummy);
+ return err;
}
void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)
{
- if (pas->tx.spi)
- psd->ops->tx_key_del(psd, pas);
- list_del(&pas->assocs_list);
+ psd->ops->tx_key_del(psd, pas);
}
static void psp_assoc_free(struct work_struct *work)
@@ -96,8 +113,11 @@ static void psp_assoc_free(struct work_struct *work)
struct psp_dev *psd = pas->psd;
mutex_lock(&psd->lock);
- if (psp_dev_is_registered(psd))
- psp_dev_tx_key_del(psd, pas);
+ if (psp_dev_is_registered(psd)) {
+ if (psp_assoc_needs_tx_key_del(pas))
+ psp_dev_tx_key_del(psd, pas);
+ list_del(&pas->assocs_list);
+ }
mutex_unlock(&psd->lock);
psp_dev_put(psd);
kfree(pas);
@@ -155,6 +175,22 @@ int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,
return err;
}
+static int psp_assoc_set_tx(struct psp_dev *psd, struct psp_assoc *pas,
+ struct psp_key_parsed *key,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+
+ if (psp_dev_has_sadb(psd)) {
+ err = psp_dev_tx_key_add(psd, pas, key, extack);
+ if (err)
+ return err;
+ }
+
+ memcpy(&pas->tx, key, sizeof(*key));
+ return 0;
+}
+
static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)
{
struct psp_skb_ext *pse;
@@ -174,12 +210,40 @@ static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)
return 0;
}
+static int
+psp_sock_set_tx_key(struct sock *sk, struct psp_dev *psd, struct psp_assoc *pas,
+ struct psp_key_parsed *key, struct netlink_ext_ack *extack)
+{
+ struct inet_connection_sock *icsk;
+ int err;
+
+ err = psp_sock_recv_queue_check(sk, pas);
+ if (err) {
+ NL_SET_ERR_MSG(extack,
+ "Socket has incompatible segments already in the recv queue");
+ return err;
+ }
+
+ err = psp_assoc_set_tx(psd, pas, key, extack);
+ if (err)
+ return err;
+
+ WRITE_ONCE(sk->sk_validate_xmit_skb, psp_validate_xmit);
+ tcp_write_collapse_fence(sk);
+ pas->upgrade_seq = tcp_sk(sk)->rcv_nxt;
+
+ icsk = inet_csk(sk);
+ icsk->icsk_ext_hdr_len += psp_sk_overhead(sk);
+ icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
+
+ return err;
+}
+
int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,
u32 version, struct psp_key_parsed *key,
struct netlink_ext_ack *extack)
{
- struct inet_connection_sock *icsk;
- struct psp_assoc *pas, *dummy;
+ struct psp_assoc *pas;
int err;
lock_sock(sk);
@@ -207,40 +271,7 @@ int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,
goto exit_unlock;
}
- err = psp_sock_recv_queue_check(sk, pas);
- if (err) {
- NL_SET_ERR_MSG(extack, "Socket has incompatible segments already in the recv queue");
- goto exit_unlock;
- }
-
- /* Pass a fake association to drivers to make sure they don't
- * try to store pointers to it. For re-keying we'll need to
- * re-allocate the assoc structures.
- */
- dummy = psp_assoc_dummy(pas);
- if (!dummy) {
- err = -ENOMEM;
- goto exit_unlock;
- }
-
- memcpy(&dummy->tx, key, sizeof(*key));
- err = psp_dev_tx_key_add(psd, dummy, extack);
- if (err)
- goto exit_free_dummy;
-
- memcpy(pas->drv_data, dummy->drv_data, psd->caps->assoc_drv_spc);
- memcpy(&pas->tx, key, sizeof(*key));
-
- WRITE_ONCE(sk->sk_validate_xmit_skb, psp_validate_xmit);
- tcp_write_collapse_fence(sk);
- pas->upgrade_seq = tcp_sk(sk)->rcv_nxt;
-
- icsk = inet_csk(sk);
- icsk->icsk_ext_hdr_len += psp_sk_overhead(sk);
- icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
-
-exit_free_dummy:
- kfree(dummy);
+ err = psp_sock_set_tx_key(sk, psd, pas, key, extack);
exit_unlock:
release_sock(sk);
return err;
|
| 3/2 | 2026/09/05 10:51 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 7470 output: 19 thoughts: 159 Thoughts: **Analyzing the Patch for Fuzzing Potential** Okay, let's dive in. My initial thought is to figure out if this patch is even *worth* fuzzing, and if so, what the best approach is. I need to nail down the optimal configuration and identify the right focus symbols. First step: get a good look at the changes. I see that the patch touches: * `drivers/net/netdevsim/netdevsim.h` * `drivers/net/netdevsim/psp.c` * `include/net/psp/functions.h` * `include/net/psp/types.h` * `net/psp/psp.h` * `net/psp/psp_main.c` * `net/psp/psp_sock.c` Right, so we're dealing with the network device simulator and some kind of "psp" (likely packet scheduling or processing, based on the include paths). Definitely interesting. Next, I need to understand the context of these modifications. I'll need to use `grepper` or `read-file` to get the full picture and see what's actually being changed. That'll let me decide whether we're looking at something that could be hit by fuzzing, and if so, what the most vulnerable areas are. |
| 4/2 | 2026/09/05 10:52 | tool | grepper |
0mArgs:{
"Expression": "CONFIG_INET_PSP"
}Results: {
"Output": "drivers/net/netdevsim/Makefile=19=endif\ndrivers/net/netdevsim/Makefile-20-\ndrivers/net/netdevsim/Makefile:21:ifneq ($(CONFIG_INET_PSP),)\ndrivers/net/netdevsim/Makefile-22-netdevsim-objs += psp.o\n--\ndrivers/net/netdevsim/netdevsim.h=444=static inline void nsim_macsec_teardown(struct netdevsim *ns)\n--\ndrivers/net/netdevsim/netdevsim.h-448-\ndrivers/net/netdevsim/netdevsim.h:449:#if IS_ENABLED(CONFIG_INET_PSP)\ndrivers/net/netdevsim/netdevsim.h-450-int nsim_psp_init(struct netdevsim *ns);\n--\ninclude/linux/netdevice.h=2158=struct net_device {\n--\ninclude/linux/netdevice.h-2388-#endif\ninclude/linux/netdevice.h:2389:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/linux/netdevice.h-2390-\tstruct psp_dev __rcu\t*psp_dev;\n--\ninclude/linux/skbuff.h=5043=enum skb_ext_id {\n--\ninclude/linux/skbuff.h-5058-#endif\ninclude/linux/skbuff.h:5059:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/linux/skbuff.h-5060-\tSKB_EXT_PSP,\n--\ninclude/net/inet_timewait_sock.h=33=struct inet_timewait_sock {\n--\ninclude/net/inet_timewait_sock.h-84-\tstruct inet_bind2_bucket\t*tw_tb2;\ninclude/net/inet_timewait_sock.h:85:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/inet_timewait_sock.h-86-\tstruct psp_assoc __rcu\t *psp_assoc;\n--\ninclude/net/psp/functions.h=25=void psp_assoc_put(struct psp_assoc *pas);\ninclude/net/psp/functions.h-26-\ninclude/net/psp/functions.h:27:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/psp/functions.h-28-unsigned int psp_key_size(u32 version);\n--\ninclude/net/sock.h=365=struct sock {\n--\ninclude/net/sock.h-466-#endif\ninclude/net/sock.h:467:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/sock.h-468-\tstruct psp_assoc __rcu\t*psp_assoc;\n--\nnet/Makefile=20=obj-$(CONFIG_UNIX)\t\t+= unix/\nnet/Makefile:21:obj-$(CONFIG_INET_PSP)\t\t+= psp/\nnet/Makefile-22-obj-y\t\t\t\t+= ipv6/\n--\nnet/core/skbuff.c=5150=static const u8 skb_ext_type_len[] = {\n--\nnet/core/skbuff.c-5165-#endif\nnet/core/skbuff.c:5166:#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/skbuff.c-5167-\t[SKB_EXT_PSP] = SKB_EXT_CHUNKSIZEOF(struct psp_skb_ext),\n--\nnet/core/sock.c=2479=struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n--\nnet/core/sock.c-2496-#endif\nnet/core/sock.c:2497:#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/sock.c-2498-\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\n--\nnet/psp/Makefile-2-\nnet/psp/Makefile:3:obj-$(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"
} |
| 5/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 9068 output: 19 thoughts: 17 Thoughts: Okay, here's my attempt at summarizing those thoughts from a first-person, expert perspective, focusing on the assumed knowledge the user has: **Diving into the Kernel Configuration for Network Simulation** Alright, time to get my hands dirty. I need to figure out the configuration dependencies for a particular aspect of my work that deals with networking simulation. My first instinct, as always, is to check the kernel's Kconfig system. Specifically, I'm thinking I need to understand how `INET_PSP` and `NETDEVSIM` relate within the configuration framework. I already have a pretty good mental map of the general network configuration structure, but these two, in this particular scenario, need a closer look. I need to quickly establish if one depends on the other, if they're mutually exclusive in some combinations, or if they’re independent features that can interact. It's time to parse the Kconfig files and see exactly how these things are defined and constrained. I expect there might be some conditional dependencies or default values I need to internalize to ensure I set up my simulation environment correctly. I'll need to pay close attention to the `select` and `depends on` statements to get a full picture. |
| 6/2 | 2026/09/05 10:52 | tool | grepper |
0mArgs:{
"Expression": "config INET_PSP"
}Results: {
"Output": "net/psp/Kconfig-4-#\nnet/psp/Kconfig:5:config INET_PSP\nnet/psp/Kconfig-6-\tbool \"PSP Security Protocol support\"\n"
} |
| 7/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 9413 output: 32 thoughts: 25 Thoughts: Here's a summary of my thought process, as if I were the one thinking it: **Examining Kconfig Files for Network Device Configuration** Okay, time to dig into the configuration aspects of these network drivers. I need to understand how the user configures these specific network devices within the kernel. The obvious starting points are the `net/psp/Kconfig` and `drivers/net/netdevsim/Kconfig` files. I'm expecting these to outline the menu entries, dependencies, default values, and help text that guide the user's choices during the kernel configuration phase (using `make menuconfig`, `make defconfig`, or similar). I’ll be looking for things like: * **Dependencies:** What other kernel features need to be enabled before these devices become available? Are there specific hardware or driver requirements? * **Default Values:** What's the initial state of the configuration? Is the driver enabled by default, or disabled? What are any default parameters like buffer sizes or queue lengths? * **Menu Structure:** How are the configuration options grouped? Are they organized logically by feature, device type, or network protocol? How deeply nested are they? * **Help Text:** Is the help text clear and informative? Does it explain the purpose of each option and the implications of enabling or disabling it? Does it provide guidance on which settings are suitable for different use cases? * **Compatibility:** Are there any known compatibility issues or limitations? Is there any indication of which hardware versions or software versions the drivers are designed for? Understanding these `Kconfig` files is foundational. It's the key to understanding how these drivers are integrated and how end-users interact with them in the larger kernel ecosystem. This is where the story begins. |
| 8/2 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "net/psp/Kconfig",
"FirstLine": 1,
"LineCount": 50
}Results: {
"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"
} |
| 9/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 10045 output: 19 thoughts: 18 Thoughts: Here's my thought process, as it went: **Examining Kconfig for Netdevsim Configuration** Okay, so I'm looking at something network-related, and I'm pretty sure I need to check the configuration options. My mind immediately goes to where these things are usually defined in the kernel source, and that's the `Kconfig` files. Since we're dealing with the network device simulator, `netdevsim`, I need to make sure I don't overlook anything specific to it. To ensure I cover all relevant aspects of the build, I need to open and read the `drivers/net/netdevsim/Kconfig` file, since that's likely where the configuration options specific to this module are defined. I have to make sure to examine this file thoroughly as part of my investigation. |
| 10/2 | 2026/09/05 10:52 | tool | grepper |
0mArgs:{
"Expression": "config NETDEVSIM"
}Results: {
"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"
} |
| 11/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 10343 output: 21 thoughts: 107 Thoughts: **Diving into the Net/PSP Implementation** Alright, let's get down to brass tacks and understand how this net/psp module works, and more specifically, how it's integrated. PSP, as I recall, is the PSP Security Protocol – that Google initiative for IP/TCP crypto offload. We know it interacts with the system via netlink and sockets, and I'm pretty sure it has some netdevsim support baked in. Time to get my hands dirty. I'm going to start by examining the core files: `net/psp/psp_main.c` should be the entry point, `net/psp/psp_sock.c` will hold the socket-related code, and then I'll be looking for `net/psp/psp_nl.c` for any Netlink interactions. Let's see if the Netlink implementation is in that specific file. To start I'll list the files in the `net/psp` directory to get a comprehensive overview of the architecture. Let's see what gems we can find. |
| 12/2 | 2026/09/05 10:52 | tool | codesearch-dir-index |
0mArgs:{
"Dir": "net/psp"
}Results: {
"Files": [
"psp-nl-gen.c",
"psp-nl-gen.h",
"psp.h",
"psp_main.c",
"psp_nl.c",
"psp_sock.c"
],
"Subdirs": null
} |
| 13/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 10759 output: 23 thoughts: 1266 Thoughts: **Patch Analysis and Fuzzing Target Identification** Okay, let's break this down. My initial assessment is that this is *definitely* worth a deeper look for fuzzing purposes. `netdevsim` is a prime target for fuzzing because it is easily accessible within QEMU, making it perfect for syzkaller. The PSP protocol itself, located in `net/psp/`, is core networking logic. We need to understand how these changes interact and see if they introduce any new avenues for exploitation. First, I'll analyze the patch diff. 1. **`drivers/net/netdevsim/psp.c`**: It looks like the patch is simplifying netdevsim's PSP implementation. We are removing some internal tracking mechanisms (`assoc_cnt`, `nsim_assoc_add`, `nsim_assoc_del`, `assoc_drv_spc`). The interesting part is that `netdevsim` isn't storing Tx keys in hardware (SADB), so it's making `tx_key_add` and `tx_key_del` operations optional within `struct psp_dev_ops`. This is a simplification which might lead to edge cases. 2. **`include/net/psp/functions.h` and `include/net/psp/types.h`**: We're seeing more simplifications. The removal of `psp_assoc_drv_data(pas)` and the documentation of the optional nature of `tx_key_add` and `tx_key_del` further clarify the intention of the changes. 3. **`net/psp/psp.h`**: The introduction of `psp_dev_has_sadb` and `psp_assoc_needs_tx_key_del` is crucial. They are defining the conditions for when Tx key operations are necessary. We're seeing lockdep assertions (`lockdep_assert_held`) which, if violated, is an indicator of a locking issue. 4. **`net/psp/psp_main.c`**: The update to `psp_dev_create` allows for NULL `tx_key_add` / `tx_key_del`, adding flexibility to the code. However, the logic regarding `assoc_drv_spc` adds a check to ensure that *both* can be null or must be set. `psp_dev_unregister` now conditionally calls `psp_dev_tx_key_del` based on the conditions. 5. **`net/psp/psp_sock.c`**: This is where it gets interesting. We're seeing modifications to `psp_dev_tx_key_add` and `psp_dev_tx_key_del` concerning dummy associations, copying of driver data and changes to the list handling. The introduction of `psp_assoc_set_tx`, `psp_sock_set_tx_key` and updates to `psp_sock_assoc_set_tx` represent changes in key management. My intuition says *this is reachable and worth targeting.* Here's why: * **Core Networking Impact**: The changes affect the PSP subsystem (`net/psp/`) and `netdevsim`, which are fundamental networking components. * **Key Lifecycle Modifications**: We're dealing with Tx key lifecycle, socket associations, device registration/unregistration, and the netlink PSP interface. These are all high-value targets for fuzzing. * **Concurrency/Locking**: The presence of `lockdep_assert_held` suggests potential concurrency issues. * **Data Structure Manipulation**: There's allocation/deallocation of data structures (like `psp_assoc_dummy`). Memory corruption is always a concern. * **Accessibility**: It's all reachable in QEMU, which is ideal for fuzzing with syzkaller. Now, let's identify the specific functions that are added or modified, focusing on entry points that can be fuzzed: * **Modified Functions**: `psp_dev_create`, `psp_dev_unregister` in `net/psp/psp_main.c`, `psp_dev_tx_key_add`, `psp_dev_tx_key_del`, `psp_assoc_free`, and `psp_sock_assoc_set_tx` in `net/psp/psp_sock.c`, `nsim_do_psp` and `nsim_psp_uninit` in `drivers/net/netdevsim/psp.c`. * **Added Static Functions**: `psp_assoc_set_tx` and `psp_sock_set_tx_key` in `net/psp/psp_sock.c`. I need to check whether these are inlined or have entry points. I'll |
| 14/2 | 2026/09/05 10:52 | tool | grepper |
0mArgs:{
"Expression": "psp_sock_assoc_set_tx"
}Results: {
"Output": "net/psp/psp.h=26=int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n--\nnet/psp/psp.h-28-\t\t\t struct netlink_ext_ack *extack);\nnet/psp/psp.h:29:int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\nnet/psp/psp.h-30-\t\t\t u32 version, struct psp_key_parsed *key,\n--\nnet/psp/psp_nl.c=826=int psp_nl_tx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-857-\nnet/psp/psp_nl.c:858:\terr = psp_sock_assoc_set_tx(socket-\u003esk, psd, version, \u0026key,\nnet/psp/psp_nl.c-859-\t\t\t\t info-\u003eextack);\n--\nnet/psp/psp_sock.c=214=psp_sock_set_tx_key(struct sock *sk, struct psp_dev *psd, struct psp_assoc *pas,\n--\nnet/psp/psp_sock.c-241-\nnet/psp/psp_sock.c:242:int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\nnet/psp/psp_sock.c-243-\t\t\t u32 version, struct psp_key_parsed *key,\n"
} |
| 15/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 13481 output: 36 thoughts: 56 Thoughts: Here's my summary, as if I were thinking these thoughts: **Diving into PSP Socket Management** Alright, time to dig into the `net/psp/psp_sock.c` file. I need to refresh my memory on how this PSP socket association process works. Specifically, I'm going to focus on the key functions related to managing transmit keys and associations. Let's start by looking closely at `psp_assoc_free`. I want to understand exactly how resources are cleaned up when an association is terminated. What happens to the underlying data structures? What's the complete teardown process? Then, I'll move on to `psp_dev_tx_key_add` and `psp_dev_tx_key_del`. I need to ensure I have a solid grasp of how transmit keys are added and removed for the associated devices. What are the key management mechanics? How does it interact with the hardware? Any potential race conditions I should be mindful of? I need to look at the locking strategy within these functions. Finally, the `psp_sock_assoc_set_tx` function. This likely orchestrates the overall process of setting up the transmit configuration for the socket association, so I should be able to get a good sense of the complete flow by studying the function. I need to be sure I am very clear on the parameters here and what they are used for. I will check for error handling here too. |
| 16/2 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "net/psp/psp_sock.c",
"FirstLine": 70,
"LineCount": 80
}Results: {
"Contents": " 70:\t{\n 71:\t\tstruct psp_dev *psd = pas-\u003epsd;\n 72:\t\tsize_t sz;\n 73:\t\n 74:\t\tlockdep_assert_held(\u0026psd-\u003elock);\n 75:\t\n 76:\t\tsz = struct_size(pas, drv_data, psd-\u003ecaps-\u003eassoc_drv_spc);\n 77:\t\treturn kmemdup(pas, sz, GFP_KERNEL);\n 78:\t}\n 79:\t\n 80:\tstatic int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,\n 81:\t\t\t\t struct psp_key_parsed *key,\n 82:\t\t\t\t struct netlink_ext_ack *extack)\n 83:\t{\n 84:\t\tstruct psp_assoc *dummy;\n 85:\t\tint err;\n 86:\t\n 87:\t\t/* Pass a fake association to drivers to make sure they don't\n 88:\t\t * try to store pointers to it. For re-keying we'll need to\n 89:\t\t * re-allocate the assoc structures.\n 90:\t\t */\n 91:\t\tdummy = psp_assoc_dummy(pas);\n 92:\t\tif (!dummy)\n 93:\t\t\treturn -ENOMEM;\n 94:\t\n 95:\t\tmemcpy(\u0026dummy-\u003etx, key, sizeof(*key));\n 96:\t\terr = psd-\u003eops-\u003etx_key_add(psd, dummy, extack);\n 97:\t\tif (!err)\n 98:\t\t\tmemcpy(pas-\u003edrv_data, dummy-\u003edrv_data,\n 99:\t\t\t psd-\u003ecaps-\u003eassoc_drv_spc);\n 100:\t\n 101:\t\tkfree(dummy);\n 102:\t\treturn err;\n 103:\t}\n 104:\t\n 105:\tvoid psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)\n 106:\t{\n 107:\t\tpsd-\u003eops-\u003etx_key_del(psd, pas);\n 108:\t}\n 109:\t\n 110:\tstatic void psp_assoc_free(struct work_struct *work)\n 111:\t{\n 112:\t\tstruct psp_assoc *pas = container_of(work, struct psp_assoc, work);\n 113:\t\tstruct psp_dev *psd = pas-\u003epsd;\n 114:\t\n 115:\t\tmutex_lock(\u0026psd-\u003elock);\n 116:\t\tif (psp_dev_is_registered(psd)) {\n 117:\t\t\tif (psp_assoc_needs_tx_key_del(pas))\n 118:\t\t\t\tpsp_dev_tx_key_del(psd, pas);\n 119:\t\t\tlist_del(\u0026pas-\u003eassocs_list);\n 120:\t\t}\n 121:\t\tmutex_unlock(\u0026psd-\u003elock);\n 122:\t\tpsp_dev_put(psd);\n 123:\t\tkfree(pas);\n 124:\t}\n 125:\t\n 126:\tstatic void psp_assoc_free_queue(struct rcu_head *head)\n 127:\t{\n 128:\t\tstruct psp_assoc *pas = container_of(head, struct psp_assoc, rcu);\n 129:\t\n 130:\t\tINIT_WORK(\u0026pas-\u003ework, psp_assoc_free);\n 131:\t\tschedule_work(\u0026pas-\u003ework);\n 132:\t}\n 133:\t\n 134:\t/**\n 135:\t * psp_assoc_put() - release a reference on a PSP association\n 136:\t * @pas: association to release\n 137:\t */\n 138:\tvoid psp_assoc_put(struct psp_assoc *pas)\n 139:\t{\n 140:\t\tif (pas \u0026\u0026 refcount_dec_and_test(\u0026pas-\u003erefcnt))\n 141:\t\t\tcall_rcu(\u0026pas-\u003ercu, psp_assoc_free_queue);\n 142:\t}\n 143:\t\n 144:\tvoid psp_sk_assoc_free(struct sock *sk)\n 145:\t{\n 146:\t\tstruct psp_assoc *pas = rcu_dereference_protected(sk-\u003epsp_assoc, 1);\n 147:\t\n 148:\t\trcu_assign_pointer(sk-\u003epsp_assoc, NULL);\n 149:\t\tpsp_assoc_put(pas);\n"
} |
| 17/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 15090 output: 37 thoughts: 25 Thoughts: Here's a summary of my thought process, as requested: **Diving into `psp_sock.c`** Alright, time to get specific. I need to take a look at the `net/psp/psp_sock.c` file again. My focus is going to be on lines 200 through 280. That section likely contains the socket-specific functions or structures I'm interested in, given the context. I'm hoping to quickly identify the relevant data structures or function calls related to the issue I'm investigating. I know I have a good handle on this code, so I anticipate being able to grasp the core logic there quickly and determine its role in the larger picture. I'm expecting to either refresh my memory on the handling of specific socket operations or perhaps get a hint about how this part of the network stack interacts with other modules. Let's see what we can find. |
| 18/2 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "net/psp/psp_sock.c",
"FirstLine": 170,
"LineCount": 90
}Results: {
"Contents": " 170:\t\terr = 0;\n 171:\t\n 172:\texit_unlock:\n 173:\t\trelease_sock(sk);\n 174:\t\n 175:\t\treturn err;\n 176:\t}\n 177:\t\n 178:\tstatic int psp_assoc_set_tx(struct psp_dev *psd, struct psp_assoc *pas,\n 179:\t\t\t\t struct psp_key_parsed *key,\n 180:\t\t\t\t struct netlink_ext_ack *extack)\n 181:\t{\n 182:\t\tint err;\n 183:\t\n 184:\t\tif (psp_dev_has_sadb(psd)) {\n 185:\t\t\terr = psp_dev_tx_key_add(psd, pas, key, extack);\n 186:\t\t\tif (err)\n 187:\t\t\t\treturn err;\n 188:\t\t}\n 189:\t\n 190:\t\tmemcpy(\u0026pas-\u003etx, key, sizeof(*key));\n 191:\t\treturn 0;\n 192:\t}\n 193:\t\n 194:\tstatic int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n 195:\t{\n 196:\t\tstruct psp_skb_ext *pse;\n 197:\t\tstruct sk_buff *skb;\n 198:\t\n 199:\t\tskb_rbtree_walk(skb, \u0026tcp_sk(sk)-\u003eout_of_order_queue) {\n 200:\t\t\tpse = skb_ext_find(skb, SKB_EXT_PSP);\n 201:\t\t\tif (!psp_pse_matches_pas(pse, pas))\n 202:\t\t\t\treturn -EBUSY;\n 203:\t\t}\n 204:\t\n 205:\t\tskb_queue_walk(\u0026sk-\u003esk_receive_queue, skb) {\n 206:\t\t\tpse = skb_ext_find(skb, SKB_EXT_PSP);\n 207:\t\t\tif (!psp_pse_matches_pas(pse, pas))\n 208:\t\t\t\treturn -EBUSY;\n 209:\t\t}\n 210:\t\treturn 0;\n 211:\t}\n 212:\t\n 213:\tstatic int\n 214:\tpsp_sock_set_tx_key(struct sock *sk, struct psp_dev *psd, struct psp_assoc *pas,\n 215:\t\t\t struct psp_key_parsed *key, struct netlink_ext_ack *extack)\n 216:\t{\n 217:\t\tstruct inet_connection_sock *icsk;\n 218:\t\tint err;\n 219:\t\n 220:\t\terr = psp_sock_recv_queue_check(sk, pas);\n 221:\t\tif (err) {\n 222:\t\t\tNL_SET_ERR_MSG(extack,\n 223:\t\t\t\t \"Socket has incompatible segments already in the recv queue\");\n 224:\t\t\treturn err;\n 225:\t\t}\n 226:\t\n 227:\t\terr = psp_assoc_set_tx(psd, pas, key, extack);\n 228:\t\tif (err)\n 229:\t\t\treturn err;\n 230:\t\n 231:\t\tWRITE_ONCE(sk-\u003esk_validate_xmit_skb, psp_validate_xmit);\n 232:\t\ttcp_write_collapse_fence(sk);\n 233:\t\tpas-\u003eupgrade_seq = tcp_sk(sk)-\u003ercv_nxt;\n 234:\t\n 235:\t\ticsk = inet_csk(sk);\n 236:\t\ticsk-\u003eicsk_ext_hdr_len += psp_sk_overhead(sk);\n 237:\t\ticsk-\u003eicsk_sync_mss(sk, icsk-\u003eicsk_pmtu_cookie);\n 238:\t\n 239:\t\treturn err;\n 240:\t}\n 241:\t\n 242:\tint psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n 243:\t\t\t\t u32 version, struct psp_key_parsed *key,\n 244:\t\t\t\t struct netlink_ext_ack *extack)\n 245:\t{\n 246:\t\tstruct psp_assoc *pas;\n 247:\t\tint err;\n 248:\t\n 249:\t\tlock_sock(sk);\n 250:\t\n 251:\t\tpas = psp_sk_assoc(sk);\n 252:\t\tif (!pas) {\n 253:\t\t\tNL_SET_ERR_MSG(extack, \"Socket has no Rx key\");\n 254:\t\t\terr = -EINVAL;\n 255:\t\t\tgoto exit_unlock;\n 256:\t\t}\n 257:\t\tif (pas-\u003epsd != psd) {\n 258:\t\t\tNL_SET_ERR_MSG(extack, \"Rx key from different device\");\n 259:\t\t\terr = -EINVAL;\n"
} |
| 19/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 16714 output: 37 thoughts: 31 Thoughts: Here's my take on the thought process, as if it were my own: **Investigating Potential PSP Device Driver Issues** Okay, I need to dive into this problem. Based on what I've seen, it seems like the issue might be related to the creation or destruction of the PSP device within the kernel. Let's start by zeroing in on `net/psp/psp_main.c`. My instinct is to examine the areas around `psp_dev_create` and `psp_dev_unregister` functions. These are likely the core functions responsible for managing the lifecycle of the PSP device, so any issues during device initialization or cleanup would manifest around those calls. I want to see how these functions are being called, what checks are being performed, and if any errors are being handled appropriately. That's the logical place to begin my debugging process. |
| 20/2 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "net/psp/psp_main.c",
"FirstLine": 55,
"LineCount": 110
}Results: {
"Contents": " 55:\t *\n 56:\t * Return: pointer to allocated PSP device, or ERR_PTR.\n 57:\t */\n 58:\tstruct psp_dev *\n 59:\tpsp_dev_create(struct net_device *netdev,\n 60:\t\t struct psp_dev_ops *psd_ops, struct psp_dev_caps *psd_caps,\n 61:\t\t void *priv_ptr)\n 62:\t{\n 63:\t\tstruct psp_dev *psd;\n 64:\t\tstatic u32 last_id;\n 65:\t\tint err;\n 66:\t\n 67:\t\tif (WARN_ON(!psd_caps-\u003eversions ||\n 68:\t\t\t !psd_ops-\u003eset_config ||\n 69:\t\t\t !psd_ops-\u003ekey_rotate ||\n 70:\t\t\t !psd_ops-\u003erx_spi_alloc ||\n 71:\t\t\t !psd_ops-\u003eget_stats ||\n 72:\t\t\t (!psd_ops-\u003etx_key_add != !psd_ops-\u003etx_key_del) ||\n 73:\t\t\t (psd_caps-\u003eassoc_drv_spc \u0026\u0026 !psd_ops-\u003etx_key_add)))\n 74:\t\t\treturn ERR_PTR(-EINVAL);\n 75:\t\n 76:\t\tpsd = kzalloc_obj(*psd);\n 77:\t\tif (!psd)\n 78:\t\t\treturn ERR_PTR(-ENOMEM);\n 79:\t\n 80:\t\tpsd-\u003emain_netdev = netdev;\n 81:\t\tINIT_LIST_HEAD(\u0026psd-\u003eassoc_dev_list);\n 82:\t\tpsd-\u003eops = psd_ops;\n 83:\t\tpsd-\u003ecaps = psd_caps;\n 84:\t\tpsd-\u003edrv_priv = priv_ptr;\n 85:\t\n 86:\t\tmutex_init(\u0026psd-\u003elock);\n 87:\t\tINIT_LIST_HEAD(\u0026psd-\u003eactive_assocs);\n 88:\t\tINIT_LIST_HEAD(\u0026psd-\u003eprev_assocs);\n 89:\t\tINIT_LIST_HEAD(\u0026psd-\u003estale_assocs);\n 90:\t\trefcount_set(\u0026psd-\u003erefcnt, 1);\n 91:\t\n 92:\t\tmutex_lock(\u0026psp_devs_lock);\n 93:\t\terr = xa_alloc_cyclic(\u0026psp_devs, \u0026psd-\u003eid, psd, xa_limit_16b,\n 94:\t\t\t\t \u0026last_id, GFP_KERNEL);\n 95:\t\tif (err) {\n 96:\t\t\tmutex_unlock(\u0026psp_devs_lock);\n 97:\t\t\tkfree(psd);\n 98:\t\t\treturn ERR_PTR(err);\n 99:\t\t}\n 100:\t\tmutex_lock(\u0026psd-\u003elock);\n 101:\t\tmutex_unlock(\u0026psp_devs_lock);\n 102:\t\n 103:\t\t/* notify before netdev assignment\n 104:\t\t * There's no strong reason for it, but thinking is to avoid creating\n 105:\t\t * implicit expectations about the PSP dev \u003c\u003e netdev relationship.\n 106:\t\t */\n 107:\t\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_ADD_NTF);\n 108:\t\n 109:\t\trcu_assign_pointer(netdev-\u003epsp_dev, psd);\n 110:\t\n 111:\t\tmutex_unlock(\u0026psd-\u003elock);\n 112:\t\n 113:\t\treturn psd;\n 114:\t}\n 115:\tEXPORT_SYMBOL(psp_dev_create);\n 116:\t\n 117:\tvoid psp_dev_free(struct psp_dev *psd)\n 118:\t{\n 119:\t\tmutex_lock(\u0026psp_devs_lock);\n 120:\t\txa_erase(\u0026psp_devs, psd-\u003eid);\n 121:\t\tmutex_unlock(\u0026psp_devs_lock);\n 122:\t\n 123:\t\tmutex_destroy(\u0026psd-\u003elock);\n 124:\t\tkfree_rcu(psd, rcu);\n 125:\t}\n 126:\t\n 127:\t/**\n 128:\t * psp_dev_unregister() - unregister PSP device\n 129:\t * @psd:\tPSP device structure\n 130:\t */\n 131:\tvoid psp_dev_unregister(struct psp_dev *psd)\n 132:\t{\n 133:\t\tstruct psp_assoc_dev *entry, *entry_tmp;\n 134:\t\tstruct psp_assoc *pas, *next;\n 135:\t\n 136:\t\tmutex_lock(\u0026psp_devs_lock);\n 137:\t\tmutex_lock(\u0026psd-\u003elock);\n 138:\t\n 139:\t\tpsp_nl_notify_dev(psd, PSP_CMD_DEV_DEL_NTF);\n 140:\t\n 141:\t\t/* Wait until psp_dev_free() to call xa_erase() to prevent a\n 142:\t\t * different psd from being added to the xarray with this id, while\n 143:\t\t * there are still references to this psd being held.\n 144:\t\t */\n 145:\t\txa_store(\u0026psp_devs, psd-\u003eid, NULL, GFP_KERNEL);\n 146:\t\tmutex_unlock(\u0026psp_devs_lock);\n 147:\t\n 148:\t\tlist_splice_init(\u0026psd-\u003eactive_assocs, \u0026psd-\u003eprev_assocs);\n 149:\t\tlist_splice_init(\u0026psd-\u003eprev_assocs, \u0026psd-\u003estale_assocs);\n 150:\t\tlist_for_each_entry_safe(pas, next, \u0026psd-\u003estale_assocs, assocs_list) {\n 151:\t\t\tif (psp_assoc_needs_tx_key_del(pas))\n 152:\t\t\t\tpsp_dev_tx_key_del(psd, pas);\n 153:\t\t\tlist_del(\u0026pas-\u003eassocs_list);\n 154:\t\t}\n"
} |
| 21/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 18573 output: 37 thoughts: 17 Thoughts: Here's a summary of my thought process: **Diving into the Netdevsim PSP Driver** Okay, time to get to the heart of the matter. I need to refresh my memory on the specifics of how the Netdevsim's PSP (Packet-Scheduling Processor) driver operates. I'm going to jump straight into the code and start with `drivers/net/netdevsim/psp.c`. That's the logical starting point for understanding its implementation details. From there, I can delve into the architecture. |
| 22/2 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/net/netdevsim/psp.c",
"FirstLine": 1,
"LineCount": 70
}Results: {
"Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0\n 2:\t\n 3:\t#include \u003clinux/ip.h\u003e\n 4:\t#include \u003clinux/skbuff.h\u003e\n 5:\t#include \u003cnet/ip6_checksum.h\u003e\n 6:\t#include \u003cnet/psp.h\u003e\n 7:\t#include \u003cnet/sock.h\u003e\n 8:\t\n 9:\t#include \"netdevsim.h\"\n 10:\t\n 11:\tvoid nsim_psp_handle_ext(struct sk_buff *skb, struct skb_ext *psp_ext)\n 12:\t{\n 13:\t\tif (psp_ext)\n 14:\t\t\t__skb_ext_set(skb, SKB_EXT_PSP, psp_ext);\n 15:\t}\n 16:\t\n 17:\tenum skb_drop_reason\n 18:\tnsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,\n 19:\t\t struct netdevsim *peer_ns, struct skb_ext **psp_ext)\n 20:\t{\n 21:\t\tenum skb_drop_reason rc = 0;\n 22:\t\tstruct psp_dev *peer_psd;\n 23:\t\tstruct psp_assoc *pas;\n 24:\t\tstruct net *net;\n 25:\t\tint psp_len;\n 26:\t\n 27:\t\trcu_read_lock();\n 28:\t\tpas = psp_skb_get_assoc_rcu(skb);\n 29:\t\tif (!pas) {\n 30:\t\t\trc = SKB_NOT_DROPPED_YET;\n 31:\t\t\tgoto out_unlock;\n 32:\t\t}\n 33:\t\n 34:\t\tif (!skb_transport_header_was_set(skb)) {\n 35:\t\t\trc = SKB_DROP_REASON_PSP_OUTPUT;\n 36:\t\t\tgoto out_unlock;\n 37:\t\t}\n 38:\t\n 39:\t\tnet = sock_net(skb-\u003esk);\n 40:\t\tif (!psp_dev_encapsulate(net, skb, pas-\u003etx.spi, pas-\u003eversion, 0)) {\n 41:\t\t\trc = SKB_DROP_REASON_PSP_OUTPUT;\n 42:\t\t\tgoto out_unlock;\n 43:\t\t}\n 44:\t\n 45:\t\tpsp_len = skb-\u003elen - skb_inner_transport_offset(skb);\n 46:\t\tatomic64_inc(\u0026ns-\u003epsp.tx_packets);\n 47:\t\tatomic64_add(psp_len, \u0026ns-\u003epsp.tx_bytes);\n 48:\t\n 49:\t\t/* Now pretend we just received this frame */\n 50:\t\tpeer_psd = rcu_dereference(peer_ns-\u003epsp.dev);\n 51:\t\tif (peer_psd \u0026\u0026 peer_psd-\u003econfig.versions \u0026 (1 \u003c\u003c pas-\u003eversion)) {\n 52:\t\t\tbool strip_icv = false;\n 53:\t\t\tu8 generation;\n 54:\t\n 55:\t\t\t/* We cheat a bit and put the generation in the key.\n 56:\t\t\t * In real life if generation was too old, then decryption would\n 57:\t\t\t * fail. Here, we just make it so a bad key causes a bad\n 58:\t\t\t * generation too, and psp_sk_rx_policy_check() will fail.\n 59:\t\t\t */\n 60:\t\t\tgeneration = pas-\u003etx.key[0];\n 61:\t\n 62:\t\t\tskb_ext_reset(skb);\n 63:\t\t\tskb-\u003emac_len = ETH_HLEN;\n 64:\t\t\tif (psp_dev_rcv(skb, peer_psd-\u003eid, generation, strip_icv)) {\n 65:\t\t\t\trc = SKB_DROP_REASON_PSP_OUTPUT;\n 66:\t\t\t\tgoto out_unlock;\n 67:\t\t\t}\n 68:\t\n 69:\t\t\t*psp_ext = skb-\u003eextensions;\n 70:\t\t\trefcount_inc(\u0026(*psp_ext)-\u003erefcnt);\n"
} |
| 23/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 19812 output: 39 thoughts: 28 Thoughts: Here's a summary of my thought process, as requested: **Diving into `psp.c`** Okay, time to get to the heart of the matter. I need to investigate the behavior of `__nsim_psp_uninit`. I immediately know that it's located within `drivers/net/netdevsim/psp.c`, so that's where I'll be starting. I'm expecting this function to be critical for uninitializing or cleaning up after a simulated network device, likely pertaining to the Packet Switching Path (PSP) component, since that seems to be the context. I'm hoping I can glean some insights from how it's implemented and where it's called, specifically about resource management or potential race conditions. Let's see what's actually going on in there. |
| 24/2 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "drivers/net/netdevsim/psp.c",
"FirstLine": 180,
"LineCount": 40
}Results: {
"Contents": " 180:\t};\n 181:\t\n 182:\tstatic struct psp_dev_caps nsim_psp_caps = {\n 183:\t\t.versions = 1 \u003c\u003c PSP_VERSION_HDR0_AES_GCM_128 |\n 184:\t\t\t 1 \u003c\u003c PSP_VERSION_HDR0_AES_GMAC_128 |\n 185:\t\t\t 1 \u003c\u003c PSP_VERSION_HDR0_AES_GCM_256 |\n 186:\t\t\t 1 \u003c\u003c PSP_VERSION_HDR0_AES_GMAC_256,\n 187:\t};\n 188:\t\n 189:\tstatic void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)\n 190:\t{\n 191:\t\tstruct psp_dev *psd;\n 192:\t\n 193:\t\tpsd = rcu_dereference_protected(ns-\u003epsp.dev,\n 194:\t\t\t\t\t\tteardown ||\n 195:\t\t\t\t\t\tlockdep_is_held(\u0026ns-\u003epsp.rereg_lock));\n 196:\t\tif (psd) {\n 197:\t\t\trcu_assign_pointer(ns-\u003epsp.dev, NULL);\n 198:\t\t\tsynchronize_rcu();\n 199:\t\t\tpsp_dev_unregister(psd);\n 200:\t\t}\n 201:\t}\n 202:\t\n 203:\tvoid nsim_psp_uninit(struct netdevsim *ns)\n 204:\t{\n 205:\t\tdebugfs_remove(ns-\u003epsp.rereg);\n 206:\t\tmutex_destroy(\u0026ns-\u003epsp.rereg_lock);\n 207:\t\t__nsim_psp_uninit(ns, true);\n 208:\t}\n 209:\t\n 210:\tstatic ssize_t\n 211:\tnsim_psp_rereg_write(struct file *file, const char __user *data, size_t count,\n 212:\t\t\t loff_t *ppos)\n 213:\t{\n 214:\t\tstruct netdevsim *ns = file-\u003eprivate_data;\n 215:\t\tstruct psp_dev *psd;\n 216:\t\tssize_t ret;\n 217:\t\n 218:\t\tmutex_lock(\u0026ns-\u003epsp.rereg_lock);\n 219:\t\t__nsim_psp_uninit(ns, false);\n"
} |
| 25/2 | 2026/09/05 10:52 | llm | patch-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 20700 output: 217 thoughts: 501 Thoughts: **Analysis of PSP and Netdevsim Integration** Okay, let's break this down systematically. First, I need to identify the core configuration requirements. Clearly, `CONFIG_INET_PSP` is essential since this patch targets the `net/psp/` directory and enables PSP support in the `netdevsim` driver. `CONFIG_NETDEVSIM` is also critical, it's the simulated network device driver itself. It's obvious that `INET_PSP` hinges on `INET` and `NETDEVSIM` depends on `NET_CORE`, `SYSFS` and the like, as expected. Next, I need to verify the critical symbols. My attention goes to: `psp_dev_create`, `psp_dev_unregister`, `psp_dev_tx_key_add`, `psp_dev_tx_key_del`, `psp_assoc_free`, `psp_sock_assoc_set_tx`, `psp_sock_set_tx_key`, and `nsim_do_psp`. Are these genuinely *specific* to PSP logic within netdevsim, or are they more generic? Yes, confirmed. They are all directly tied to PSP and the netdevsim implementation. Now, let's create a clear summary of the changes: * **Reachability:** These modifications impact both the PSP subsystem and the simulated netdevsim driver. In a virtualized environment, this functionality is fully accessible through netlink commands, socket operations, and netdevsim virtual devices. * **Changes:** This patch makes some Tx key offloading callbacks optional for devices lacking Tx SADB, addresses driver registration validation in `psp_dev_create`, refactors association cleanup in `psp_dev_unregister` and `psp_assoc_free`, and updates key assignment in `psp_sock_assoc_set_tx`. * **Configs:** We have `INET_PSP` and `NETDEVSIM`. * **Focus Symbols:** The most important functions are `psp_sock_assoc_set_tx`, `psp_sock_set_tx_key`, `psp_dev_tx_key_add`, `psp_dev_tx_key_del`, `psp_assoc_free`, `psp_dev_create`, `psp_dev_unregister`, and `nsim_do_psp`. Right, that covers the essentials. Time for the tool call. |
| 26/2 | 2026/09/05 10:52 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"INET_PSP",
"NETDEVSIM"
],
"FocusSymbols": [
"psp_sock_assoc_set_tx",
"psp_sock_set_tx_key",
"psp_dev_tx_key_add",
"psp_dev_tx_key_del",
"psp_assoc_free",
"psp_dev_create",
"psp_dev_unregister",
"nsim_do_psp"
],
"Reasoning": "The patch modifies core networking PSP (PSP Security Protocol) subsystem logic and netdevsim device driver code. It makes Tx key offload callbacks optional for devices without SADB, refactors key allocation/deallocation in psp_sock.c, updates device registration checks in psp_main.c, and removes obsolete assoc tracking in netdevsim. These code paths are fully reachable via netlink commands and netdevsim interfaces in standard QEMU environments.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"INET_PSP",
"NETDEVSIM"
],
"FocusSymbols": [
"psp_sock_assoc_set_tx",
"psp_sock_set_tx_key",
"psp_dev_tx_key_add",
"psp_dev_tx_key_del",
"psp_assoc_free",
"psp_dev_create",
"psp_dev_unregister",
"nsim_do_psp"
],
"Reasoning": "The patch modifies core networking PSP (PSP Security Protocol) subsystem logic and netdevsim device driver code. It makes Tx key offload callbacks optional for devices without SADB, refactors key allocation/deallocation in psp_sock.c, updates device registration checks in psp_main.c, and removes obsolete assoc tracking in netdevsim. These code paths are fully reachable via netlink commands and netdevsim interfaces in standard QEMU environments.",
"WorthFuzzing": true
} |
| 27/1 | 2026/09/05 10:52 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 28/2 | 2026/09/05 10:52 | agent | kmsan-evaluator |
0mModel:core Args: null Results: {
"KMSANReasoning": "The patch makes the `tx_key_add` and `tx_key_del` driver callbacks optional for PSP devices without SADB support, refactoring Tx key association management and removing unused key handling hooks from netdevsim. All allocated data structures continue to be fully zero-initialized via `kzalloc_flex`, `kzalloc_obj`, or `kmemdup`. The changes do not introduce or expose uninitialized memory, info-leaks, or reads of uninitialized struct fields. Any potential issues with pointer checks, list manipulation, or lifecycle handling fall strictly under the domain of KASAN and LOCKDEP. Therefore, dedicated KMSAN fuzzing is not warranted.",
"NeedsKMSAN": false
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit 2702790def9417fe11fe7245d887573e871af31b
Author: syz-cluster <triage@syzkaller.com>
Date: Sat Sep 5 10:51:50 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 55aec41237b9b..181b6baaba7af 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -122,7 +122,6 @@ struct netdevsim {
struct dentry *rereg;
struct mutex rereg_lock;
u32 spi;
- u32 assoc_cnt;
} psp;
struct nsim_bus_dev *nsim_bus_dev;
diff --git a/drivers/net/netdevsim/psp.c b/drivers/net/netdevsim/psp.c
index 6b3532b5e360d..b7452c49b581d 100644
--- a/drivers/net/netdevsim/psp.c
+++ b/drivers/net/netdevsim/psp.c
@@ -23,7 +23,6 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,
struct psp_assoc *pas;
struct net *net;
int psp_len;
- void **ptr;
rcu_read_lock();
pas = psp_skb_get_assoc_rcu(skb);
@@ -37,12 +36,6 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,
goto out_unlock;
}
- ptr = psp_assoc_drv_data(pas);
- if (*ptr != ns) {
- rc = SKB_DROP_REASON_PSP_OUTPUT;
- goto out_unlock;
- }
-
net = sock_net(skb->sk);
if (!psp_dev_encapsulate(net, skb, pas->tx.spi, pas->version, 0)) {
rc = SKB_DROP_REASON_PSP_OUTPUT;
@@ -149,19 +142,6 @@ nsim_rx_spi_alloc(struct psp_dev *psd, u32 version,
return 0;
}
-static int nsim_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,
- struct netlink_ext_ack *extack)
-{
- struct netdevsim *ns = psd->drv_priv;
- void **ptr = psp_assoc_drv_data(pas);
-
- /* Copy drv_priv from psd to assoc */
- *ptr = psd->drv_priv;
- ns->psp.assoc_cnt++;
-
- return 0;
-}
-
static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)
{
struct netdevsim *ns = psd->drv_priv;
@@ -177,15 +157,6 @@ static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)
return 0;
}
-static void nsim_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)
-{
- struct netdevsim *ns = psd->drv_priv;
- void **ptr = psp_assoc_drv_data(pas);
-
- *ptr = NULL;
- ns->psp.assoc_cnt--;
-}
-
static void nsim_get_stats(struct psp_dev *psd, struct psp_dev_stats *stats)
{
struct netdevsim *ns = psd->drv_priv;
@@ -204,8 +175,6 @@ static void nsim_get_stats(struct psp_dev *psd, struct psp_dev_stats *stats)
static struct psp_dev_ops nsim_psp_ops = {
.set_config = nsim_psp_set_config,
.rx_spi_alloc = nsim_rx_spi_alloc,
- .tx_key_add = nsim_assoc_add,
- .tx_key_del = nsim_assoc_del,
.key_rotate = nsim_key_rotate,
.get_stats = nsim_get_stats,
};
@@ -215,7 +184,6 @@ static struct psp_dev_caps nsim_psp_caps = {
1 << PSP_VERSION_HDR0_AES_GMAC_128 |
1 << PSP_VERSION_HDR0_AES_GCM_256 |
1 << PSP_VERSION_HDR0_AES_GMAC_256,
- .assoc_drv_spc = sizeof(void *),
};
static void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)
@@ -230,7 +198,6 @@ static void __nsim_psp_uninit(struct netdevsim *ns, bool teardown)
synchronize_rcu();
psp_dev_unregister(psd);
}
- WARN_ON(ns->psp.assoc_cnt);
}
void nsim_psp_uninit(struct netdevsim *ns)
diff --git a/include/net/psp/functions.h b/include/net/psp/functions.h
index c5c23a54774e6..b23c30898389c 100644
--- a/include/net/psp/functions.h
+++ b/include/net/psp/functions.h
@@ -24,11 +24,6 @@ int psp_dev_rcv(struct sk_buff *skb, u16 dev_id, u8 generation, bool strip_icv);
/* Kernel-facing API */
void psp_assoc_put(struct psp_assoc *pas);
-static inline void *psp_assoc_drv_data(struct psp_assoc *pas)
-{
- return pas->drv_data;
-}
-
#if IS_ENABLED(CONFIG_INET_PSP)
unsigned int psp_key_size(u32 version);
void psp_sk_assoc_free(struct sock *sk);
diff --git a/include/net/psp/types.h b/include/net/psp/types.h
index 87991a1ea02d0..b8905efbd604e 100644
--- a/include/net/psp/types.h
+++ b/include/net/psp/types.h
@@ -219,12 +219,16 @@ struct psp_dev_ops {
* @tx_key_add: add a Tx key to the device
* Install an association in the device. Core will allocate space
* for the driver to use at drv_data.
+ * Can be left NULL if device does not store Tx keys and @tx_key_del
+ * is also NULL.
*/
int (*tx_key_add)(struct psp_dev *psd, struct psp_assoc *pas,
struct netlink_ext_ack *extack);
/**
* @tx_key_del: remove a Tx key from the device
* Remove an association from the device.
+ * Can be left NULL if device does not store Tx keys and @tx_key_add
+ * is also NULL.
*/
void (*tx_key_del)(struct psp_dev *psd, struct psp_assoc *pas);
diff --git a/net/psp/psp.h b/net/psp/psp.h
index 86eeba823ced1..bbb39e2f5b0ab 100644
--- a/net/psp/psp.h
+++ b/net/psp/psp.h
@@ -53,4 +53,16 @@ static inline bool psp_dev_is_registered(struct psp_dev *psd)
return !!psd->ops;
}
+static inline bool psp_dev_has_sadb(struct psp_dev *psd)
+{
+ lockdep_assert_held(&psd->lock);
+ return !!psd->ops->tx_key_del;
+}
+
+static inline bool psp_assoc_needs_tx_key_del(struct psp_assoc *pas)
+{
+ lockdep_assert_held(&pas->psd->lock);
+ return psp_dev_has_sadb(pas->psd) && pas->tx.spi;
+}
+
#endif /* __PSP_PSP_H */
diff --git a/net/psp/psp_main.c b/net/psp/psp_main.c
index c9c1a8826b7f9..91473f96ad211 100644
--- a/net/psp/psp_main.c
+++ b/net/psp/psp_main.c
@@ -68,9 +68,9 @@ psp_dev_create(struct net_device *netdev,
!psd_ops->set_config ||
!psd_ops->key_rotate ||
!psd_ops->rx_spi_alloc ||
- !psd_ops->tx_key_add ||
- !psd_ops->tx_key_del ||
- !psd_ops->get_stats))
+ !psd_ops->get_stats ||
+ (!psd_ops->tx_key_add != !psd_ops->tx_key_del) ||
+ (psd_caps->assoc_drv_spc && !psd_ops->tx_key_add)))
return ERR_PTR(-EINVAL);
psd = kzalloc_obj(*psd);
@@ -147,8 +147,11 @@ void psp_dev_unregister(struct psp_dev *psd)
list_splice_init(&psd->active_assocs, &psd->prev_assocs);
list_splice_init(&psd->prev_assocs, &psd->stale_assocs);
- list_for_each_entry_safe(pas, next, &psd->stale_assocs, assocs_list)
- psp_dev_tx_key_del(psd, pas);
+ list_for_each_entry_safe(pas, next, &psd->stale_assocs, assocs_list) {
+ if (psp_assoc_needs_tx_key_del(pas))
+ psp_dev_tx_key_del(psd, pas);
+ list_del(&pas->assocs_list);
+ }
list_for_each_entry_safe(entry, entry_tmp, &psd->assoc_dev_list,
dev_list) {
diff --git a/net/psp/psp_sock.c b/net/psp/psp_sock.c
index 1a2a6b7516b0f..6a4becc38b55a 100644
--- a/net/psp/psp_sock.c
+++ b/net/psp/psp_sock.c
@@ -78,16 +78,33 @@ static struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)
}
static int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,
+ struct psp_key_parsed *key,
struct netlink_ext_ack *extack)
{
- return psd->ops->tx_key_add(psd, pas, extack);
+ struct psp_assoc *dummy;
+ int err;
+
+ /* Pass a fake association to drivers to make sure they don't
+ * try to store pointers to it. For re-keying we'll need to
+ * re-allocate the assoc structures.
+ */
+ dummy = psp_assoc_dummy(pas);
+ if (!dummy)
+ return -ENOMEM;
+
+ memcpy(&dummy->tx, key, sizeof(*key));
+ err = psd->ops->tx_key_add(psd, dummy, extack);
+ if (!err)
+ memcpy(pas->drv_data, dummy->drv_data,
+ psd->caps->assoc_drv_spc);
+
+ kfree(dummy);
+ return err;
}
void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)
{
- if (pas->tx.spi)
- psd->ops->tx_key_del(psd, pas);
- list_del(&pas->assocs_list);
+ psd->ops->tx_key_del(psd, pas);
}
static void psp_assoc_free(struct work_struct *work)
@@ -96,8 +113,11 @@ static void psp_assoc_free(struct work_struct *work)
struct psp_dev *psd = pas->psd;
mutex_lock(&psd->lock);
- if (psp_dev_is_registered(psd))
- psp_dev_tx_key_del(psd, pas);
+ if (psp_dev_is_registered(psd)) {
+ if (psp_assoc_needs_tx_key_del(pas))
+ psp_dev_tx_key_del(psd, pas);
+ list_del(&pas->assocs_list);
+ }
mutex_unlock(&psd->lock);
psp_dev_put(psd);
kfree(pas);
@@ -155,6 +175,22 @@ int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,
return err;
}
+static int psp_assoc_set_tx(struct psp_dev *psd, struct psp_assoc *pas,
+ struct psp_key_parsed *key,
+ struct netlink_ext_ack *extack)
+{
+ int err;
+
+ if (psp_dev_has_sadb(psd)) {
+ err = psp_dev_tx_key_add(psd, pas, key, extack);
+ if (err)
+ return err;
+ }
+
+ memcpy(&pas->tx, key, sizeof(*key));
+ return 0;
+}
+
static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)
{
struct psp_skb_ext *pse;
@@ -174,12 +210,40 @@ static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)
return 0;
}
+static int
+psp_sock_set_tx_key(struct sock *sk, struct psp_dev *psd, struct psp_assoc *pas,
+ struct psp_key_parsed *key, struct netlink_ext_ack *extack)
+{
+ struct inet_connection_sock *icsk;
+ int err;
+
+ err = psp_sock_recv_queue_check(sk, pas);
+ if (err) {
+ NL_SET_ERR_MSG(extack,
+ "Socket has incompatible segments already in the recv queue");
+ return err;
+ }
+
+ err = psp_assoc_set_tx(psd, pas, key, extack);
+ if (err)
+ return err;
+
+ WRITE_ONCE(sk->sk_validate_xmit_skb, psp_validate_xmit);
+ tcp_write_collapse_fence(sk);
+ pas->upgrade_seq = tcp_sk(sk)->rcv_nxt;
+
+ icsk = inet_csk(sk);
+ icsk->icsk_ext_hdr_len += psp_sk_overhead(sk);
+ icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
+
+ return err;
+}
+
int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,
u32 version, struct psp_key_parsed *key,
struct netlink_ext_ack *extack)
{
- struct inet_connection_sock *icsk;
- struct psp_assoc *pas, *dummy;
+ struct psp_assoc *pas;
int err;
lock_sock(sk);
@@ -207,40 +271,7 @@ int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,
goto exit_unlock;
}
- err = psp_sock_recv_queue_check(sk, pas);
- if (err) {
- NL_SET_ERR_MSG(extack, "Socket has incompatible segments already in the recv queue");
- goto exit_unlock;
- }
-
- /* Pass a fake association to drivers to make sure they don't
- * try to store pointers to it. For re-keying we'll need to
- * re-allocate the assoc structures.
- */
- dummy = psp_assoc_dummy(pas);
- if (!dummy) {
- err = -ENOMEM;
- goto exit_unlock;
- }
-
- memcpy(&dummy->tx, key, sizeof(*key));
- err = psp_dev_tx_key_add(psd, dummy, extack);
- if (err)
- goto exit_free_dummy;
-
- memcpy(pas->drv_data, dummy->drv_data, psd->caps->assoc_drv_spc);
- memcpy(&pas->tx, key, sizeof(*key));
-
- WRITE_ONCE(sk->sk_validate_xmit_skb, psp_validate_xmit);
- tcp_write_collapse_fence(sk);
- pas->upgrade_seq = tcp_sk(sk)->rcv_nxt;
-
- icsk = inet_csk(sk);
- icsk->icsk_ext_hdr_len += psp_sk_overhead(sk);
- icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
-
-exit_free_dummy:
- kfree(dummy);
+ err = psp_sock_set_tx_key(sk, psd, pas, key, extack);
exit_unlock:
release_sock(sk);
return err;
|
| 29/3 | 2026/09/05 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 6682 output: 29 thoughts: 813 Thoughts: **Analyzing the Patch for Uninitialized Memory Risks** Okay, let's dive into this patch and see if it introduces any uninitialized memory vulnerabilities that would necessitate KMSAN fuzzing. My initial impression is that it's a refactoring exercise within the PSP (Policy-Based Security Protocol) subsystem, primarily focused on simplifying key management and association handling within the `netdevsim` driver. First, I need to understand exactly what’s been changed. The patch removes `assoc_cnt` and the `tx_key_add`/`tx_key_del` functions from the `netdevsim` PSP implementation. It seems like the `netdevsim` driver is being adapted to a more generic, possibly optional, approach to key handling. Notably, `.assoc_drv_spc = sizeof(void *)` is removed, suggesting a shift away from a driver-specific association data size. Also, the check `ptr = psp_assoc_drv_data(pas); if (*ptr != ns) ...` has been removed from `nsim_do_psp`, likely related to the removal of driver-specific data management. The header file changes, particularly the removal of `psp_assoc_drv_data()` and the documentation allowing `tx_key_add` and `tx_key_del` to be NULL, reinforce this notion of optional key management. New functions like `psp_dev_has_sadb()` and `psp_assoc_needs_tx_key_del()` are introduced, providing conditional checks based on whether the device supports SA (Security Association) Database functionality and if a TX key needs to be deleted during association handling. The `psp_dev_create` function's changes are critical. The patch now allows `tx_key_add` and `tx_key_del` to be NULL under specific conditions. It seems that if these functions are NULL and `assoc_drv_spc` is 0, the device is considered not to manage Tx keys. This feels like a significant simplification, but this is where I need to pay close attention to potential memory safety issues. The logic now includes `(!psd_ops->tx_key_add != !psd_ops->tx_key_del) || (psd_caps->assoc_drv_spc && !psd_ops->tx_key_add)`. I need to ensure that the combination of these conditions doesn't lead to any unexpected behavior, especially regarding uninitialized memory reads or writes when these functions are not provided. In `psp_dev_unregister` and `psp_assoc_free`, we see conditional calls to `psp_dev_tx_key_del` based on `psp_assoc_needs_tx_key_del()`. This makes sense, but the removal of `list_del` from inside of `psp_dev_tx_key_del` itself in favour of the caller, is something I need to keep in mind. The changes in `psp_sock.c` are also important. The dummy allocation logic is now explicitly inside `psp_dev_tx_key_add`. The calls to `psd->ops->tx_key_del(psd, pas);` are potentially problematic if the drivers forget to handle these correctly. Splitting off `psp_assoc_set_tx` and `psp_sock_set_tx_key`, and the associated `memcpy` within `psp_assoc_set_tx` all look like cleanups. My main area of concern right now is how the "dummy" allocation is being handled. I need to understand how `psp_assoc_dummy` works, to verify if there's any risk of uninitialized memory being used when the key handling is "dummy". I'm going to quickly use `grepper` (or `read-file` if need be) to examine the implementation of `psp_assoc_dummy` to be sure there's no subtle, lurking vulnerability here. I need to make sure the dummy allocation isn't inadvertently exposing uninitialized memory when the device chooses not to store tx keys. This is where a subtle flaw is most likely to reside. |
| 30/3 | 2026/09/05 10:52 | tool | grepper |
0mArgs:{
"Expression": "psp_assoc_dummy",
"PathPrefix": "net/psp/"
}Results: {
"Output": "net/psp/psp_sock.c=47=struct psp_assoc *psp_assoc_create(struct psp_dev *psd)\n--\nnet/psp/psp_sock.c-68-\nnet/psp/psp_sock.c:69:static struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)\nnet/psp/psp_sock.c-70-{\n--\nnet/psp/psp_sock.c=80=static int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,\n--\nnet/psp/psp_sock.c-90-\t */\nnet/psp/psp_sock.c:91:\tdummy = psp_assoc_dummy(pas);\nnet/psp/psp_sock.c-92-\tif (!dummy)\n"
} |
| 31/3 | 2026/09/05 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 8622 output: 36 thoughts: 20 Thoughts: Here's my summary, as though I'm reading and processing the code: **Diving into `psp_sock.c` - Lines 40-120** Okay, let's pull up `psp_sock.c` and focus on lines 40 through 120. I'm guessing this section probably deals with the core socket initialization or some important setup routine, given its placement early in the file. I'll be looking for function definitions, struct declarations related to the socket structure itself, and any initial assignments to crucial variables. I'm expecting to see things like the allocation of socket descriptors, the setting of default options (if any), and potentially some early error handling. I'm also ready to trace control flow through any potential branches, checking for any edge cases or unusual parameter handling which might cause issues down the line. I'll also be focusing on any use of `ioctl` calls as they may indicate hardware dependency. I'm going to pay close attention to the data types being used for various socket options; type mismatches can be notoriously tricky to debug. Anything related to threading and synchronization within the socket's internal structures would be of particular interest; I need to be aware of any potential race conditions. Let's see what's what! |
| 32/3 | 2026/09/05 10:52 | tool | read-file |
0mArgs:{
"File": "net/psp/psp_sock.c",
"FirstLine": 40,
"LineCount": 80
}Results: {
"Contents": " 40:\t\t\tsk_skb_reason_drop(sk, skb, SKB_DROP_REASON_PSP_OUTPUT);\n 41:\t\t\treturn NULL;\n 42:\t\t}\n 43:\t\n 44:\t\treturn skb;\n 45:\t}\n 46:\t\n 47:\tstruct psp_assoc *psp_assoc_create(struct psp_dev *psd)\n 48:\t{\n 49:\t\tstruct psp_assoc *pas;\n 50:\t\n 51:\t\tlockdep_assert_held(\u0026psd-\u003elock);\n 52:\t\n 53:\t\tpas = kzalloc_flex(*pas, drv_data, psd-\u003ecaps-\u003eassoc_drv_spc,\n 54:\t\t\t\t GFP_KERNEL_ACCOUNT);\n 55:\t\tif (!pas)\n 56:\t\t\treturn NULL;\n 57:\t\n 58:\t\tpas-\u003epsd = psd;\n 59:\t\tpas-\u003edev_id = psd-\u003eid;\n 60:\t\tpas-\u003egeneration = psd-\u003egeneration;\n 61:\t\tpsp_dev_get(psd);\n 62:\t\trefcount_set(\u0026pas-\u003erefcnt, 1);\n 63:\t\n 64:\t\tlist_add_tail(\u0026pas-\u003eassocs_list, \u0026psd-\u003eactive_assocs);\n 65:\t\n 66:\t\treturn pas;\n 67:\t}\n 68:\t\n 69:\tstatic struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)\n 70:\t{\n 71:\t\tstruct psp_dev *psd = pas-\u003epsd;\n 72:\t\tsize_t sz;\n 73:\t\n 74:\t\tlockdep_assert_held(\u0026psd-\u003elock);\n 75:\t\n 76:\t\tsz = struct_size(pas, drv_data, psd-\u003ecaps-\u003eassoc_drv_spc);\n 77:\t\treturn kmemdup(pas, sz, GFP_KERNEL);\n 78:\t}\n 79:\t\n 80:\tstatic int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,\n 81:\t\t\t\t struct psp_key_parsed *key,\n 82:\t\t\t\t struct netlink_ext_ack *extack)\n 83:\t{\n 84:\t\tstruct psp_assoc *dummy;\n 85:\t\tint err;\n 86:\t\n 87:\t\t/* Pass a fake association to drivers to make sure they don't\n 88:\t\t * try to store pointers to it. For re-keying we'll need to\n 89:\t\t * re-allocate the assoc structures.\n 90:\t\t */\n 91:\t\tdummy = psp_assoc_dummy(pas);\n 92:\t\tif (!dummy)\n 93:\t\t\treturn -ENOMEM;\n 94:\t\n 95:\t\tmemcpy(\u0026dummy-\u003etx, key, sizeof(*key));\n 96:\t\terr = psd-\u003eops-\u003etx_key_add(psd, dummy, extack);\n 97:\t\tif (!err)\n 98:\t\t\tmemcpy(pas-\u003edrv_data, dummy-\u003edrv_data,\n 99:\t\t\t psd-\u003ecaps-\u003eassoc_drv_spc);\n 100:\t\n 101:\t\tkfree(dummy);\n 102:\t\treturn err;\n 103:\t}\n 104:\t\n 105:\tvoid psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)\n 106:\t{\n 107:\t\tpsd-\u003eops-\u003etx_key_del(psd, pas);\n 108:\t}\n 109:\t\n 110:\tstatic void psp_assoc_free(struct work_struct *work)\n 111:\t{\n 112:\t\tstruct psp_assoc *pas = container_of(work, struct psp_assoc, work);\n 113:\t\tstruct psp_dev *psd = pas-\u003epsd;\n 114:\t\n 115:\t\tmutex_lock(\u0026psd-\u003elock);\n 116:\t\tif (psp_dev_is_registered(psd)) {\n 117:\t\t\tif (psp_assoc_needs_tx_key_del(pas))\n 118:\t\t\t\tpsp_dev_tx_key_del(psd, pas);\n 119:\t\t\tlist_del(\u0026pas-\u003eassocs_list);\n"
} |
| 33/3 | 2026/09/05 10:52 | llm | kmsan-evaluator |
0mModel:gemini-3.7-flash Args: null Results: null Tokens: input: 10112 output: 164 thoughts: 704 Thoughts: **KMSAN Assessment of PSP Association Changes** Okay, let's break this down from a KMSAN perspective. My initial thought process is to meticulously analyze these changes for potential memory safety issues. First, I need to pinpoint any potential uninitialized memory reads or leaks that could expose sensitive kernel data to user space. It looks like: * The `pas` structure is allocated with `kzalloc_flex` in `psp_assoc_create`, which zeroes the memory. * The `dummy` is created with `kmemdup`, duplicating zeroed memory. * The `key` comes from netlink input, and this requires careful consideration, but it is parsed, or validated, before being used. * The removal of `tx_key_add` and `tx_key_del` from netdevsim implies no need for SADB management in that specific context. * There aren't any newly introduced uninitialized stack variables, heap buffers, or struct padding that gets copied to user space, nor are there any that are read in conditional logic. * The refactoring makes these functions optional, but `psp_assoc_needs_tx_key_del` provides a check, using `psp_dev_has_sadb(pas->psd) && pas->tx.spi`. My next step is to examine the wider code, going beyond the immediate patch. I'll be looking for `copy_to_user` calls, netlink attributes, socket options, and any new branching based on potentially uninitialized data. However, I'm not seeing any red flags. Now, as an extra step, I'll quickly consider any potential memory corruption, Use-After-Free (UAF), or locking problems. Those are better addressed by KASAN and LOCKDEP. Time to confirm my findings against the KMSAN criteria. 1. Kernel structures sent to user space where fields or structure padding might not be fully initialized/zeroed: No concerns here. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields: No, all used struct fields are initialized. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths: No, zeroing allocators and kmemdup are used. 4. Bounds checks, lengths, or logic that could lead to accessing uninitialized bytes: No such cases were found. Therefore, `NeedsKMSAN` is definitely `false` here. To provide a robust justification, let's contrast the KMSAN and KASAN aspects. This patch refactors Tx key management to make it optional, specifically for devices that don't use a Tx key SADB. All involved structures are initialized using zero allocators like `kzalloc_obj`, `kzalloc_flex`, or `kmemdup`. No uninitialized data is exposed to user space. The nullability of the callbacks is covered by KASAN and LOCKDEP, not KMSAN. The issues are functional bugs, or locking/lifecycle issues which are properly covered by other tools. A dedicated KMSAN fuzzing session isn't needed here. I think we're ready to invoke `set-results`. |
| 34/3 | 2026/09/05 10:52 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch makes the `tx_key_add` and `tx_key_del` driver callbacks optional for PSP devices without SADB support, refactoring Tx key association management and removing unused key handling hooks from netdevsim. All allocated data structures continue to be fully zero-initialized via `kzalloc_flex`, `kzalloc_obj`, or `kmemdup`. The changes do not introduce or expose uninitialized memory, info-leaks, or reads of uninitialized struct fields. Any potential issues with pointer checks, list manipulation, or lifecycle handling fall strictly under the domain of KASAN and LOCKDEP. Therefore, dedicated KMSAN fuzzing is not warranted.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch makes the `tx_key_add` and `tx_key_del` driver callbacks optional for PSP devices without SADB support, refactoring Tx key association management and removing unused key handling hooks from netdevsim. All allocated data structures continue to be fully zero-initialized via `kzalloc_flex`, `kzalloc_obj`, or `kmemdup`. The changes do not introduce or expose uninitialized memory, info-leaks, or reads of uninitialized struct fields. Any potential issues with pointer checks, list manipulation, or lifecycle handling fall strictly under the domain of KASAN and LOCKDEP. Therefore, dedicated KMSAN fuzzing is not warranted.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|