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/mfd/arizona.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 drivers/mfd/arizona.h (limited to 'drivers/mfd/arizona.h') diff --git a/drivers/mfd/arizona.h b/drivers/mfd/arizona.h new file mode 100644 index 000000000..66d6092d0 --- /dev/null +++ b/drivers/mfd/arizona.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * wm5102.h -- WM5102 MFD internals + * + * Copyright 2012 Wolfson Microelectronics plc + * + * Author: Mark Brown + */ + +#ifndef _WM5102_H +#define _WM5102_H + +#include +#include +#include + +extern const struct regmap_config wm5102_i2c_regmap; +extern const struct regmap_config wm5102_spi_regmap; + +extern const struct regmap_config wm5110_i2c_regmap; +extern const struct regmap_config wm5110_spi_regmap; + +extern const struct regmap_config cs47l24_spi_regmap; + +extern const struct regmap_config wm8997_i2c_regmap; + +extern const struct regmap_config wm8998_i2c_regmap; + +extern const struct dev_pm_ops arizona_pm_ops; + +extern const struct regmap_irq_chip wm5102_aod; +extern const struct regmap_irq_chip wm5102_irq; + +extern const struct regmap_irq_chip wm5110_aod; +extern const struct regmap_irq_chip wm5110_irq; +extern const struct regmap_irq_chip wm5110_revd_irq; + +extern const struct regmap_irq_chip cs47l24_irq; + +extern const struct regmap_irq_chip wm8997_aod; +extern const struct regmap_irq_chip wm8997_irq; + +extern struct regmap_irq_chip wm8998_aod; +extern struct regmap_irq_chip wm8998_irq; + +int arizona_dev_init(struct arizona *arizona); +int arizona_dev_exit(struct arizona *arizona); +int arizona_irq_init(struct arizona *arizona); +int arizona_irq_exit(struct arizona *arizona); + +#endif -- cgit v1.3.1