From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- include/net/nfc/llc.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 include/net/nfc/llc.h (limited to 'include/net/nfc/llc.h') diff --git a/include/net/nfc/llc.h b/include/net/nfc/llc.h new file mode 100644 index 000000000..1f699cb17 --- /dev/null +++ b/include/net/nfc/llc.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Link Layer Control manager public interface + * + * Copyright (C) 2012 Intel Corporation. All rights reserved. + */ + +#ifndef __NFC_LLC_H_ +#define __NFC_LLC_H_ + +#include +#include + +#define LLC_NOP_NAME "nop" +#define LLC_SHDLC_NAME "shdlc" + +typedef void (*rcv_to_hci_t) (struct nfc_hci_dev *hdev, struct sk_buff *skb); +typedef int (*xmit_to_drv_t) (struct nfc_hci_dev *hdev, struct sk_buff *skb); +typedef void (*llc_failure_t) (struct nfc_hci_dev *hdev, int err); + +struct nfc_llc; + +struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev, + xmit_to_drv_t xmit_to_drv, + rcv_to_hci_t rcv_to_hci, int tx_headroom, + int tx_tailroom, llc_failure_t llc_failure); +void nfc_llc_free(struct nfc_llc *llc); + +int nfc_llc_start(struct nfc_llc *llc); +int nfc_llc_stop(struct nfc_llc *llc); +void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb); +int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb); + +int nfc_llc_init(void); +void nfc_llc_exit(void); + +#endif /* __NFC_LLC_H_ */ -- cgit v1.3.1