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/bcm/pinctrl-bcm63xx.h | 45 +++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 drivers/pinctrl/bcm/pinctrl-bcm63xx.h (limited to 'drivers/pinctrl/bcm/pinctrl-bcm63xx.h') diff --git a/drivers/pinctrl/bcm/pinctrl-bcm63xx.h b/drivers/pinctrl/bcm/pinctrl-bcm63xx.h new file mode 100644 index 000000000..3dcfabb94 --- /dev/null +++ b/drivers/pinctrl/bcm/pinctrl-bcm63xx.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2021 Álvaro Fernández Rojas + * Copyright (C) 2016 Jonas Gorski + */ + +#ifndef __PINCTRL_BCM63XX_H__ +#define __PINCTRL_BCM63XX_H__ + +#include + +#define BCM63XX_BANK_GPIOS 32 + +struct bcm63xx_pinctrl_soc { + const struct pinctrl_ops *pctl_ops; + const struct pinmux_ops *pmx_ops; + + const struct pinctrl_pin_desc *pins; + unsigned npins; + + unsigned int ngpios; +}; + +#define BCM_PIN_GROUP(n) PINCTRL_PINGROUP(#n, n##_pins, ARRAY_SIZE(n##_pins)) + +struct bcm63xx_pinctrl { + struct device *dev; + struct regmap *regs; + + struct pinctrl_desc pctl_desc; + struct pinctrl_dev *pctl_dev; + + void *driver_data; +}; + +static inline unsigned int bcm63xx_bank_pin(unsigned int pin) +{ + return pin % BCM63XX_BANK_GPIOS; +} + +int bcm63xx_pinctrl_probe(struct platform_device *pdev, + const struct bcm63xx_pinctrl_soc *soc, + void *driver_data); + +#endif /* __PINCTRL_BCM63XX_H__ */ -- cgit v1.3.1