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/devicetree.h | 54 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 drivers/pinctrl/devicetree.h (limited to 'drivers/pinctrl/devicetree.h') diff --git a/drivers/pinctrl/devicetree.h b/drivers/pinctrl/devicetree.h new file mode 100644 index 000000000..def76aba9 --- /dev/null +++ b/drivers/pinctrl/devicetree.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Internal interface to pinctrl device tree integration + * + * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. + */ + +#include + +struct device_node; +struct of_phandle_args; + +struct pinctrl; +struct pinctrl_dev; + +#ifdef CONFIG_OF + +void pinctrl_dt_free_maps(struct pinctrl *p); +int pinctrl_dt_to_map(struct pinctrl *p, struct pinctrl_dev *pctldev); + +int pinctrl_count_index_with_args(const struct device_node *np, + const char *list_name); + +int pinctrl_parse_index_with_args(const struct device_node *np, + const char *list_name, int index, + struct of_phandle_args *out_args); + +#else + +static inline int pinctrl_dt_to_map(struct pinctrl *p, + struct pinctrl_dev *pctldev) +{ + return 0; +} + +static inline void pinctrl_dt_free_maps(struct pinctrl *p) +{ +} + +static inline int pinctrl_count_index_with_args(const struct device_node *np, + const char *list_name) +{ + return -ENODEV; +} + +static inline int +pinctrl_parse_index_with_args(const struct device_node *np, + const char *list_name, int index, + struct of_phandle_args *out_args) +{ + return -ENODEV; +} + +#endif -- cgit v1.3.1