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/adav801.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 sound/soc/codecs/adav801.c (limited to 'sound/soc/codecs/adav801.c') diff --git a/sound/soc/codecs/adav801.c b/sound/soc/codecs/adav801.c new file mode 100644 index 000000000..f734c7121 --- /dev/null +++ b/sound/soc/codecs/adav801.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ADAV801 audio driver + * + * Copyright 2014 Analog Devices Inc. + */ + +#include +#include +#include + +#include + +#include "adav80x.h" + +static const struct spi_device_id adav80x_spi_id[] = { + { "adav801", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, adav80x_spi_id); + +static int adav80x_spi_probe(struct spi_device *spi) +{ + struct regmap_config config; + + config = adav80x_regmap_config; + config.read_flag_mask = 0x01; + + return adav80x_bus_probe(&spi->dev, devm_regmap_init_spi(spi, &config)); +} + +static struct spi_driver adav80x_spi_driver = { + .driver = { + .name = "adav801", + }, + .probe = adav80x_spi_probe, + .id_table = adav80x_spi_id, +}; +module_spi_driver(adav80x_spi_driver); + +MODULE_DESCRIPTION("ASoC ADAV801 driver"); +MODULE_AUTHOR("Lars-Peter Clausen "); +MODULE_AUTHOR("Yi Li >"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1