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 --- drivers/nfc/mei_phy.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 drivers/nfc/mei_phy.h (limited to 'drivers/nfc/mei_phy.h') diff --git a/drivers/nfc/mei_phy.h b/drivers/nfc/mei_phy.h new file mode 100644 index 000000000..9b9c5eb54 --- /dev/null +++ b/drivers/nfc/mei_phy.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LOCAL_MEI_PHY_H_ +#define __LOCAL_MEI_PHY_H_ + +#include +#include +#include + +#define MEI_NFC_UUID UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \ + 0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c) +#define MEI_NFC_HEADER_SIZE 10 +#define MEI_NFC_MAX_HCI_PAYLOAD 300 + +/** + * struct nfc_mei_phy - NFC description of the MEI PHY and interface functions + * + * @cldev: mei client device + * @hdev: nfc hci device + * + * @send_wq: send completion wait queue + * @fw_ivn: NFC Interface Version Number + * @vendor_id: NFC manufacturer ID + * @radio_type: NFC radio type + * @reserved: reserved for alignment + * @req_id: message counter + * @recv_req_id: reception message counter + * @powered: the device is in powered state + * @hard_fault: < 0 if hardware error occurred + * and prevents normal operation. + */ +struct nfc_mei_phy { + struct mei_cl_device *cldev; + struct nfc_hci_dev *hdev; + + wait_queue_head_t send_wq; + u8 fw_ivn; + u8 vendor_id; + u8 radio_type; + u8 reserved; + + u16 req_id; + u16 recv_req_id; + + int powered; + int hard_fault; +}; + +extern const struct nfc_phy_ops mei_phy_ops; + +struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device); +void nfc_mei_phy_free(struct nfc_mei_phy *phy); + +#endif /* __LOCAL_MEI_PHY_H_ */ -- cgit v1.3.1