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/madera.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 drivers/mfd/madera.h (limited to 'drivers/mfd/madera.h') diff --git a/drivers/mfd/madera.h b/drivers/mfd/madera.h new file mode 100644 index 000000000..900205678 --- /dev/null +++ b/drivers/mfd/madera.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * MFD internals for Cirrus Logic Madera codecs + * + * Copyright 2015-2018 Cirrus Logic + */ + +#ifndef MADERA_MFD_H +#define MADERA_MFD_H + +#include +#include + +struct madera; + +extern const struct dev_pm_ops madera_pm_ops; +extern const struct of_device_id madera_of_match[]; + +int madera_dev_init(struct madera *madera); +int madera_dev_exit(struct madera *madera); + +const char *madera_name_from_type(enum madera_type type); + +extern const struct regmap_config cs47l15_16bit_spi_regmap; +extern const struct regmap_config cs47l15_32bit_spi_regmap; +extern const struct regmap_config cs47l15_16bit_i2c_regmap; +extern const struct regmap_config cs47l15_32bit_i2c_regmap; +int cs47l15_patch(struct madera *madera); + +extern const struct regmap_config cs47l35_16bit_spi_regmap; +extern const struct regmap_config cs47l35_32bit_spi_regmap; +extern const struct regmap_config cs47l35_16bit_i2c_regmap; +extern const struct regmap_config cs47l35_32bit_i2c_regmap; +int cs47l35_patch(struct madera *madera); + +extern const struct regmap_config cs47l85_16bit_spi_regmap; +extern const struct regmap_config cs47l85_32bit_spi_regmap; +extern const struct regmap_config cs47l85_16bit_i2c_regmap; +extern const struct regmap_config cs47l85_32bit_i2c_regmap; +int cs47l85_patch(struct madera *madera); + +extern const struct regmap_config cs47l90_16bit_spi_regmap; +extern const struct regmap_config cs47l90_32bit_spi_regmap; +extern const struct regmap_config cs47l90_16bit_i2c_regmap; +extern const struct regmap_config cs47l90_32bit_i2c_regmap; +int cs47l90_patch(struct madera *madera); + +extern const struct regmap_config cs47l92_16bit_spi_regmap; +extern const struct regmap_config cs47l92_32bit_spi_regmap; +extern const struct regmap_config cs47l92_16bit_i2c_regmap; +extern const struct regmap_config cs47l92_32bit_i2c_regmap; +int cs47l92_patch(struct madera *madera); + +#endif -- cgit v1.3.1