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/gtm601.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 sound/soc/codecs/gtm601.c (limited to 'sound/soc/codecs/gtm601.c') diff --git a/sound/soc/codecs/gtm601.c b/sound/soc/codecs/gtm601.c new file mode 100644 index 000000000..1f165e467 --- /dev/null +++ b/sound/soc/codecs/gtm601.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * This is a simple driver for the GTM601 Voice PCM interface + * + * Copyright (C) 2015 Goldelico GmbH + * + * Author: Marek Belisko + * + * Based on wm8727.c driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct snd_soc_dapm_widget gtm601_dapm_widgets[] = { + SND_SOC_DAPM_OUTPUT("AOUT"), + SND_SOC_DAPM_INPUT("AIN"), +}; + +static const struct snd_soc_dapm_route gtm601_dapm_routes[] = { + { "AOUT", NULL, "Playback" }, + { "Capture", NULL, "AIN" }, +}; + +static struct snd_soc_dai_driver gtm601_dai = { + .name = "gtm601", + .playback = { + .stream_name = "Playback", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_8000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, + .capture = { + .stream_name = "Capture", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_8000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, +}; + +static struct snd_soc_dai_driver bm818_dai = { + .name = "bm818", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, + .capture = { + .stream_name = "Capture", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, +}; + +static const struct snd_soc_component_driver soc_component_dev_gtm601 = { + .dapm_widgets = gtm601_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(gtm601_dapm_widgets), + .dapm_routes = gtm601_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(gtm601_dapm_routes), + .idle_bias_on = 1, + .use_pmdown_time = 1, + .endianness = 1, +}; + +static int gtm601_platform_probe(struct platform_device *pdev) +{ + const struct snd_soc_dai_driver *dai_driver; + + dai_driver = of_device_get_match_data(&pdev->dev); + + return devm_snd_soc_register_component(&pdev->dev, + &soc_component_dev_gtm601, + (struct snd_soc_dai_driver *)dai_driver, 1); +} + +static const struct of_device_id gtm601_codec_of_match[] __maybe_unused = { + { .compatible = "option,gtm601", .data = (void *)>m601_dai }, + { .compatible = "broadmobi,bm818", .data = (void *)&bm818_dai }, + {}, +}; +MODULE_DEVICE_TABLE(of, gtm601_codec_of_match); + +static struct platform_driver gtm601_codec_driver = { + .driver = { + .name = "gtm601", + .of_match_table = of_match_ptr(gtm601_codec_of_match), + }, + .probe = gtm601_platform_probe, +}; + +module_platform_driver(gtm601_codec_driver); + +MODULE_DESCRIPTION("ASoC gtm601 driver"); +MODULE_AUTHOR("Marek Belisko "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:gtm601"); -- cgit v1.3.1