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 --- sound/soc/codecs/rt5575-spi.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 sound/soc/codecs/rt5575-spi.h (limited to 'sound/soc/codecs/rt5575-spi.h') diff --git a/sound/soc/codecs/rt5575-spi.h b/sound/soc/codecs/rt5575-spi.h new file mode 100644 index 000000000..084638820 --- /dev/null +++ b/sound/soc/codecs/rt5575-spi.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * rt5575-spi.h -- ALC5575 SPI driver + * + * Copyright(c) 2025 Realtek Semiconductor Corp. + * + */ + +#ifndef __RT5575_SPI_H__ +#define __RT5575_SPI_H__ + +#if IS_ENABLED(CONFIG_SND_SOC_RT5575_SPI) +struct spi_device *rt5575_spi_get_device(struct device *dev); +int rt5575_spi_fw_load(struct spi_device *spi); +#else +static inline struct spi_device *rt5575_spi_get_device(struct device *dev) +{ + return NULL; +} + +static inline int rt5575_spi_fw_load(struct spi_device *spi) +{ + return -EINVAL; +} +#endif + +#endif /* __RT5575_SPI_H__ */ -- cgit v1.3.1