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/hda-dai.c | 105 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 sound/soc/codecs/hda-dai.c (limited to 'sound/soc/codecs/hda-dai.c') diff --git a/sound/soc/codecs/hda-dai.c b/sound/soc/codecs/hda-dai.c new file mode 100644 index 000000000..b9caae7e4 --- /dev/null +++ b/sound/soc/codecs/hda-dai.c @@ -0,0 +1,105 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright(c) 2021-2022 Intel Corporation +// +// Author: Cezary Rojewski +// + +#include +#include +#include "hda.h" + +static int hda_codec_dai_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) +{ + struct hda_pcm_stream *stream_info; + struct hda_codec *codec; + struct hda_pcm *pcm; + int ret; + + codec = dev_to_hda_codec(dai->dev); + stream_info = snd_soc_dai_get_dma_data(dai, substream); + pcm = container_of(stream_info, struct hda_pcm, stream[substream->stream]); + + dev_dbg(dai->dev, "open stream codec: %08x, info: %p, pcm: %p %s substream: %p\n", + codec->core.vendor_id, stream_info, pcm, pcm->name, substream); + + snd_hda_codec_pcm_get(pcm); + + ret = stream_info->ops.open(stream_info, codec, substream); + if (ret < 0) { + dev_err(dai->dev, "codec open failed: %d\n", ret); + snd_hda_codec_pcm_put(pcm); + return ret; + } + + return 0; +} + +static void hda_codec_dai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) +{ + struct hda_pcm_stream *stream_info; + struct hda_codec *codec; + struct hda_pcm *pcm; + int ret; + + codec = dev_to_hda_codec(dai->dev); + stream_info = snd_soc_dai_get_dma_data(dai, substream); + pcm = container_of(stream_info, struct hda_pcm, stream[substream->stream]); + + dev_dbg(dai->dev, "close stream codec: %08x, info: %p, pcm: %p %s substream: %p\n", + codec->core.vendor_id, stream_info, pcm, pcm->name, substream); + + ret = stream_info->ops.close(stream_info, codec, substream); + if (ret < 0) + dev_err(dai->dev, "codec close failed: %d\n", ret); + + snd_hda_codec_pcm_put(pcm); +} + +static int hda_codec_dai_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) +{ + struct hda_pcm_stream *stream_info; + struct hda_codec *codec; + + codec = dev_to_hda_codec(dai->dev); + stream_info = snd_soc_dai_get_dma_data(dai, substream); + + snd_hda_codec_cleanup(codec, stream_info, substream); + + return 0; +} + +static int hda_codec_dai_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct hda_pcm_stream *stream_info; + struct hdac_stream *stream; + struct hda_codec *codec; + unsigned int format; + unsigned int bits; + int ret; + + codec = dev_to_hda_codec(dai->dev); + stream = substream->runtime->private_data; + stream_info = snd_soc_dai_get_dma_data(dai, substream); + + bits = snd_hdac_stream_format_bits(runtime->format, runtime->subformat, + stream_info->maxbps); + format = snd_hdac_stream_format(runtime->channels, bits, runtime->rate); + + ret = snd_hda_codec_prepare(codec, stream_info, stream->stream_tag, format, substream); + if (ret < 0) { + dev_err(dai->dev, "codec prepare failed: %d\n", ret); + return ret; + } + + return 0; +} + +const struct snd_soc_dai_ops snd_soc_hda_codec_dai_ops = { + .startup = hda_codec_dai_startup, + .shutdown = hda_codec_dai_shutdown, + .hw_free = hda_codec_dai_hw_free, + .prepare = hda_codec_dai_prepare, +}; +EXPORT_SYMBOL_GPL(snd_soc_hda_codec_dai_ops); -- cgit v1.3.1