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/pcm.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 sound/usb/pcm.h (limited to 'sound/usb/pcm.h') diff --git a/sound/usb/pcm.h b/sound/usb/pcm.h new file mode 100644 index 000000000..c096021ad --- /dev/null +++ b/sound/usb/pcm.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __USBAUDIO_PCM_H +#define __USBAUDIO_PCM_H + +void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream); +int snd_usb_pcm_suspend(struct snd_usb_stream *as); +int snd_usb_pcm_resume(struct snd_usb_stream *as); + +bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *as); + +int snd_usb_init_pitch(struct snd_usb_audio *chip, + const struct audioformat *fmt); +void snd_usb_preallocate_buffer(struct snd_usb_substream *subs); + +int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip, + struct audioformat *fmt); + +const struct audioformat * +snd_usb_find_format(struct list_head *fmt_list_head, snd_pcm_format_t format, + unsigned int rate, unsigned int channels, bool strict_match, + struct snd_usb_substream *subs); +const struct audioformat * +snd_usb_find_substream_format(struct snd_usb_substream *subs, + const struct snd_pcm_hw_params *params); + +int snd_usb_hw_params(struct snd_usb_substream *subs, + struct snd_pcm_hw_params *hw_params); +int snd_usb_hw_free(struct snd_usb_substream *subs); +#endif /* __USBAUDIO_PCM_H */ -- cgit v1.3.1