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/pinctrl/intel/pinctrl-tangier.h | 92 +++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 drivers/pinctrl/intel/pinctrl-tangier.h (limited to 'drivers/pinctrl/intel/pinctrl-tangier.h') diff --git a/drivers/pinctrl/intel/pinctrl-tangier.h b/drivers/pinctrl/intel/pinctrl-tangier.h new file mode 100644 index 000000000..6af8eeeae --- /dev/null +++ b/drivers/pinctrl/intel/pinctrl-tangier.h @@ -0,0 +1,92 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Intel Tangier pinctrl functions + * + * Copyright (C) 2016-2023 Intel Corporation + * + * Authors: Andy Shevchenko + * Raag Jadav + */ + +#ifndef PINCTRL_TANGIER_H +#define PINCTRL_TANGIER_H + +#include +#include + +#include + +#include "pinctrl-intel.h" + +struct device; +struct platform_device; + +#define TNG_FAMILY_NR 64 +#define TNG_FAMILY_LEN 0x400 + +/** + * struct tng_family - Tangier pin family description + * @barno: MMIO BAR number where registers for this family reside + * @pin_base: Starting pin of pins in this family + * @npins: Number of pins in this family + * @protected: True if family is protected by access + * @regs: Family specific common registers + */ +struct tng_family { + unsigned int barno; + unsigned int pin_base; + size_t npins; + bool protected; + void __iomem *regs; +}; + +#define TNG_FAMILY(b, s, e) \ + { \ + .barno = (b), \ + .pin_base = (s), \ + .npins = (e) - (s) + 1, \ + } + +#define TNG_FAMILY_PROTECTED(b, s, e) \ + { \ + .barno = (b), \ + .pin_base = (s), \ + .npins = (e) - (s) + 1, \ + .protected = true, \ + } + +/** + * struct tng_pinctrl - Tangier pinctrl private structure + * @dev: Pointer to the device structure + * @lock: Lock to serialize register access + * @pctldesc: Pin controller description + * @pctldev: Pointer to the pin controller device + * @families: Array of families this pinctrl handles + * @nfamilies: Number of families in the array + * @functions: Array of functions + * @nfunctions: Number of functions in the array + * @groups: Array of pin groups + * @ngroups: Number of groups in the array + * @pins: Array of pins this pinctrl controls + * @npins: Number of pins in the array + */ +struct tng_pinctrl { + struct device *dev; + raw_spinlock_t lock; + struct pinctrl_desc pctldesc; + struct pinctrl_dev *pctldev; + + /* Pin controller configuration */ + const struct tng_family *families; + size_t nfamilies; + const struct intel_function *functions; + size_t nfunctions; + const struct intel_pingroup *groups; + size_t ngroups; + const struct pinctrl_pin_desc *pins; + size_t npins; +}; + +int devm_tng_pinctrl_probe(struct platform_device *pdev); + +#endif /* PINCTRL_TANGIER_H */ -- cgit v1.3.1