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 --- include/sound/sdca_regmap.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 include/sound/sdca_regmap.h (limited to 'include/sound/sdca_regmap.h') diff --git a/include/sound/sdca_regmap.h b/include/sound/sdca_regmap.h new file mode 100644 index 000000000..792540a53 --- /dev/null +++ b/include/sound/sdca_regmap.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * The MIPI SDCA specification is available for public downloads at + * https://www.mipi.org/mipi-sdca-v1-0-download + * + * Copyright (C) 2025 Cirrus Logic, Inc. and + * Cirrus Logic International Semiconductor Ltd. + */ + +#ifndef __SDCA_REGMAP_H__ +#define __SDCA_REGMAP_H__ + +struct device; +struct sdca_function_data; +struct regmap; +struct reg_default; + +bool sdca_regmap_readable(struct sdca_function_data *function, unsigned int reg); +bool sdca_regmap_writeable(struct sdca_function_data *function, unsigned int reg); +bool sdca_regmap_volatile(struct sdca_function_data *function, unsigned int reg); +bool sdca_regmap_deferrable(struct sdca_function_data *function, unsigned int reg); +int sdca_regmap_mbq_size(struct sdca_function_data *function, unsigned int reg); + +int sdca_regmap_count_constants(struct device *dev, struct sdca_function_data *function); +int sdca_regmap_populate_constants(struct device *dev, struct sdca_function_data *function, + struct reg_default *consts); + +int sdca_regmap_write_defaults(struct device *dev, struct regmap *regmap, + struct sdca_function_data *function); +int sdca_regmap_write_init(struct device *dev, struct regmap *regmap, + struct sdca_function_data *function); + +#endif // __SDCA_REGMAP_H__ -- cgit v1.3.1