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/usb/media.h | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 sound/usb/media.h (limited to 'sound/usb/media.h') diff --git a/sound/usb/media.h b/sound/usb/media.h new file mode 100644 index 000000000..f5bdec1d6 --- /dev/null +++ b/sound/usb/media.h @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * media.h - Media Controller specific ALSA driver code + * + * Copyright (c) 2019 Shuah Khan + * + */ + +/* + * This file adds Media Controller support to the ALSA driver + * to use the Media Controller API to share the tuner with DVB + * and V4L2 drivers that control the media device. + * + * The media device is created based on the existing quirks framework. + * Using this approach, the media controller API usage can be added for + * a specific device. + */ +#ifndef __MEDIA_H + +#ifdef CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER + +#include +#include +#include +#include +#include + +struct media_ctl { + struct media_device *media_dev; + struct media_entity media_entity; + struct media_intf_devnode *intf_devnode; + struct media_link *intf_link; + struct media_pad media_pad; + struct media_pipeline media_pipe; +}; + +/* + * One source pad each for SNDRV_PCM_STREAM_CAPTURE and + * SNDRV_PCM_STREAM_PLAYBACK. One for sink pad to link + * to AUDIO Source + */ +#define MEDIA_MIXER_PAD_MAX (SNDRV_PCM_STREAM_LAST + 2) + +struct media_mixer_ctl { + struct media_device *media_dev; + struct media_entity media_entity; + struct media_intf_devnode *intf_devnode; + struct media_link *intf_link; + struct media_pad media_pad[MEDIA_MIXER_PAD_MAX]; + struct media_pipeline media_pipe; +}; + +int snd_media_device_create(struct snd_usb_audio *chip, + struct usb_interface *iface); +void snd_media_device_delete(struct snd_usb_audio *chip); +int snd_media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm, + int stream); +void snd_media_stream_delete(struct snd_usb_substream *subs); +int snd_media_start_pipeline(struct snd_usb_substream *subs); +void snd_media_stop_pipeline(struct snd_usb_substream *subs); +#else +static inline int snd_media_device_create(struct snd_usb_audio *chip, + struct usb_interface *iface) + { return 0; } +static inline void snd_media_device_delete(struct snd_usb_audio *chip) { } +static inline int snd_media_stream_init(struct snd_usb_substream *subs, + struct snd_pcm *pcm, int stream) + { return 0; } +static inline void snd_media_stream_delete(struct snd_usb_substream *subs) { } +static inline int snd_media_start_pipeline(struct snd_usb_substream *subs) + { return 0; } +static inline void snd_media_stop_pipeline(struct snd_usb_substream *subs) { } +#endif +#endif /* __MEDIA_H */ -- cgit v1.3.1