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/sof/ipc3-priv.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 sound/soc/sof/ipc3-priv.h (limited to 'sound/soc/sof/ipc3-priv.h') diff --git a/sound/soc/sof/ipc3-priv.h b/sound/soc/sof/ipc3-priv.h new file mode 100644 index 000000000..866c5f67b --- /dev/null +++ b/sound/soc/sof/ipc3-priv.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * Copyright(c) 2021 Intel Corporation + */ + +#ifndef __SOUND_SOC_SOF_IPC3_PRIV_H +#define __SOUND_SOC_SOF_IPC3_PRIV_H + +#include "sof-priv.h" + +/* IPC3 specific ops */ +extern const struct sof_ipc_pcm_ops ipc3_pcm_ops; +extern const struct sof_ipc_tplg_ops ipc3_tplg_ops; +extern const struct sof_ipc_tplg_control_ops tplg_ipc3_control_ops; +extern const struct sof_ipc_fw_loader_ops ipc3_loader_ops; +extern const struct sof_ipc_fw_tracing_ops ipc3_dtrace_ops; + +/* helpers for fw_ready and ext_manifest parsing */ +int sof_ipc3_get_ext_windows(struct snd_sof_dev *sdev, + const struct sof_ipc_ext_data_hdr *ext_hdr); +int sof_ipc3_get_cc_info(struct snd_sof_dev *sdev, + const struct sof_ipc_ext_data_hdr *ext_hdr); +int sof_ipc3_validate_fw_version(struct snd_sof_dev *sdev); + +/* dtrace position update */ +int ipc3_dtrace_posn_update(struct snd_sof_dev *sdev, + struct sof_ipc_dma_trace_posn *posn); +/* RX handler backend */ +void sof_ipc3_do_rx_work(struct snd_sof_dev *sdev, struct sof_ipc_cmd_hdr *hdr, void *msg_buf); + +/* dtrace platform callback wrappers */ +static inline int sof_dtrace_host_init(struct snd_sof_dev *sdev, + struct snd_dma_buffer *dmatb, + struct sof_ipc_dma_trace_params_ext *dtrace_params) +{ + const struct snd_sof_dsp_ops *dsp_ops = sdev->pdata->desc->ops; + + if (dsp_ops->trace_init) + return dsp_ops->trace_init(sdev, dmatb, dtrace_params); + + return 0; +} + +static inline int sof_dtrace_host_release(struct snd_sof_dev *sdev) +{ + const struct snd_sof_dsp_ops *dsp_ops = sdev->pdata->desc->ops; + + if (dsp_ops->trace_release) + return dsp_ops->trace_release(sdev); + + return 0; +} + +static inline int sof_dtrace_host_trigger(struct snd_sof_dev *sdev, int cmd) +{ + const struct snd_sof_dsp_ops *dsp_ops = sdev->pdata->desc->ops; + + if (dsp_ops->trace_trigger) + return dsp_ops->trace_trigger(sdev, cmd); + + return 0; +} + +#endif -- cgit v1.3.1