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/fdp/fdp.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 drivers/nfc/fdp/fdp.h (limited to 'drivers/nfc/fdp/fdp.h') diff --git a/drivers/nfc/fdp/fdp.h b/drivers/nfc/fdp/fdp.h new file mode 100644 index 000000000..2e9161a4d --- /dev/null +++ b/drivers/nfc/fdp/fdp.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* ------------------------------------------------------------------------- + * Copyright (C) 2014-2016, Intel Corporation + * + * ------------------------------------------------------------------------- + */ + +#ifndef __LOCAL_FDP_H_ +#define __LOCAL_FDP_H_ + +#include +#include + +struct fdp_i2c_phy { + struct i2c_client *i2c_dev; + struct gpio_desc *power_gpio; + struct nci_dev *ndev; + + /* < 0 if i2c error occurred */ + int hard_fault; + uint16_t next_read_size; +}; + +int fdp_nci_probe(struct fdp_i2c_phy *phy, const struct nfc_phy_ops *phy_ops, + struct nci_dev **ndev, int tx_headroom, int tx_tailroom, + u8 clock_type, u32 clock_freq, const u8 *fw_vsc_cfg); +void fdp_nci_remove(struct nci_dev *ndev); + +#endif /* __LOCAL_FDP_H_ */ -- cgit v1.3.1