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/mediatek/mtk-eint.h | 127 ++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 drivers/pinctrl/mediatek/mtk-eint.h (limited to 'drivers/pinctrl/mediatek/mtk-eint.h') diff --git a/drivers/pinctrl/mediatek/mtk-eint.h b/drivers/pinctrl/mediatek/mtk-eint.h new file mode 100644 index 000000000..3cdd6f631 --- /dev/null +++ b/drivers/pinctrl/mediatek/mtk-eint.h @@ -0,0 +1,127 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2014-2025 MediaTek Inc. + * + * Author: Maoguang Meng + * Sean Wang + * Hao Chang + * Qingliang Li + */ +#ifndef __MTK_EINT_H +#define __MTK_EINT_H + +#include + +struct mtk_eint_regs { + unsigned int stat; + unsigned int ack; + unsigned int mask; + unsigned int mask_set; + unsigned int mask_clr; + unsigned int sens; + unsigned int sens_set; + unsigned int sens_clr; + unsigned int soft; + unsigned int soft_set; + unsigned int soft_clr; + unsigned int pol; + unsigned int pol_set; + unsigned int pol_clr; + unsigned int dom_en; + unsigned int dbnc_ctrl; + unsigned int dbnc_set; + unsigned int dbnc_clr; +}; + +struct mtk_eint_hw { + u8 port_mask; + u8 ports; + unsigned int ap_num; + unsigned int db_cnt; + const unsigned int *db_time; +}; + +struct mtk_eint_pin { + u16 number; + u8 instance; + u8 index; + bool debounce; + bool dual_edge; +}; + +extern const unsigned int debounce_time_mt2701[]; +extern const unsigned int debounce_time_mt6765[]; +extern const unsigned int debounce_time_mt6795[]; +extern const unsigned int debounce_time_mt6878[]; + +struct mtk_eint; + +struct mtk_eint_xt { + int (*get_gpio_n)(void *data, unsigned long eint_n, + unsigned int *gpio_n, + struct gpio_chip **gpio_chip); + int (*get_gpio_state)(void *data, unsigned long eint_n); + int (*set_gpio_as_eint)(void *data, unsigned long eint_n); +}; + +struct mtk_eint { + struct device *dev; + void __iomem **base; + int nbase; + u16 *base_pin_num; + struct irq_domain *domain; + int irq; + + int *dual_edge; + u16 **pin_list; + u32 **wake_mask; + u32 **cur_mask; + + /* Used to fit into various EINT device */ + const struct mtk_eint_hw *hw; + const struct mtk_eint_regs *regs; + struct mtk_eint_pin *pins; + u16 num_db_time; + + /* Used to fit into various pinctrl device */ + void *pctl; + const struct mtk_eint_xt *gpio_xlate; +}; + +#if IS_ENABLED(CONFIG_EINT_MTK) +int mtk_eint_do_init(struct mtk_eint *eint, struct mtk_eint_pin *eint_pin); +int mtk_eint_do_suspend(struct mtk_eint *eint); +int mtk_eint_do_resume(struct mtk_eint *eint); +int mtk_eint_set_debounce(struct mtk_eint *eint, unsigned long eint_n, + unsigned int debounce); +int mtk_eint_find_irq(struct mtk_eint *eint, unsigned long eint_n); + +#else +static inline int mtk_eint_do_init(struct mtk_eint *eint, + struct mtk_eint_pin *eint_pin) +{ + return -EOPNOTSUPP; +} + +static inline int mtk_eint_do_suspend(struct mtk_eint *eint) +{ + return -EOPNOTSUPP; +} + +static inline int mtk_eint_do_resume(struct mtk_eint *eint) +{ + return -EOPNOTSUPP; +} + +static inline int mtk_eint_set_debounce(struct mtk_eint *eint, unsigned long eint_n, + unsigned int debounce) +{ + return -EOPNOTSUPP; +} + +static inline int mtk_eint_find_irq(struct mtk_eint *eint, unsigned long eint_n) +{ + return -EOPNOTSUPP; +} +#endif +#endif /* __MTK_EINT_H */ -- cgit v1.3.1