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/bt-sco.c | 116 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 sound/soc/codecs/bt-sco.c (limited to 'sound/soc/codecs/bt-sco.c') diff --git a/sound/soc/codecs/bt-sco.c b/sound/soc/codecs/bt-sco.c new file mode 100644 index 000000000..b085885e3 --- /dev/null +++ b/sound/soc/codecs/bt-sco.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for generic Bluetooth SCO link + * Copyright 2011 Lars-Peter Clausen + */ + +#include +#include +#include + +#include + +static const struct snd_soc_dapm_widget bt_sco_widgets[] = { + SND_SOC_DAPM_INPUT("RX"), + SND_SOC_DAPM_OUTPUT("TX"), + SND_SOC_DAPM_AIF_IN("BT_SCO_RX", "Playback", 0, + SND_SOC_NOPM, 0, 0), + SND_SOC_DAPM_AIF_OUT("BT_SCO_TX", "Capture", 0, + SND_SOC_NOPM, 0, 0), + SND_SOC_DAPM_AIF_IN("BT_SCO_RX_WB", "WB Playback", 0, + SND_SOC_NOPM, 0, 0), + SND_SOC_DAPM_AIF_OUT("BT_SCO_TX_WB", "WB Capture", 0, + SND_SOC_NOPM, 0, 0), +}; + +static const struct snd_soc_dapm_route bt_sco_routes[] = { + { "BT_SCO_TX", NULL, "RX" }, + { "TX", NULL, "BT_SCO_RX" }, + { "BT_SCO_TX_WB", NULL, "RX" }, + { "TX", NULL, "BT_SCO_RX_WB" }, +}; + +static struct snd_soc_dai_driver bt_sco_dai[] = { + { + .name = "bt-sco-pcm", + .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, + }, + }, + { + .name = "bt-sco-pcm-wb", + .playback = { + .stream_name = "WB Playback", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, + .capture = { + .stream_name = "WB Capture", + .channels_min = 1, + .channels_max = 1, + .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000, + .formats = SNDRV_PCM_FMTBIT_S16_LE, + }, + } +}; + +static const struct snd_soc_component_driver soc_component_dev_bt_sco = { + .dapm_widgets = bt_sco_widgets, + .num_dapm_widgets = ARRAY_SIZE(bt_sco_widgets), + .dapm_routes = bt_sco_routes, + .num_dapm_routes = ARRAY_SIZE(bt_sco_routes), + .idle_bias_on = 1, + .use_pmdown_time = 1, + .endianness = 1, +}; + +static int bt_sco_probe(struct platform_device *pdev) +{ + return devm_snd_soc_register_component(&pdev->dev, + &soc_component_dev_bt_sco, + bt_sco_dai, ARRAY_SIZE(bt_sco_dai)); +} + +static const struct platform_device_id bt_sco_driver_ids[] = { + { .name = "dfbmcs320" }, + { .name = "bt-sco" }, + { } +}; +MODULE_DEVICE_TABLE(platform, bt_sco_driver_ids); + +#if defined(CONFIG_OF) +static const struct of_device_id bt_sco_codec_of_match[] = { + { .compatible = "delta,dfbmcs320", }, + { .compatible = "linux,bt-sco", }, + {}, +}; +MODULE_DEVICE_TABLE(of, bt_sco_codec_of_match); +#endif + +static struct platform_driver bt_sco_driver = { + .driver = { + .name = "bt-sco", + .of_match_table = of_match_ptr(bt_sco_codec_of_match), + }, + .probe = bt_sco_probe, + .id_table = bt_sco_driver_ids, +}; + +module_platform_driver(bt_sco_driver); + +MODULE_AUTHOR("Lars-Peter Clausen "); +MODULE_DESCRIPTION("ASoC generic bluetooth sco link driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1