selftests/bpf: Reject graph kptr use after RCU unlockgrafted

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 <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 151 insertions, 0 deletions

diff --git a/include/sound/sof/stream.h b/include/sound/sof/stream.h
new file mode 100644
index 000000000..1bb25487d
--- /dev/null
+++ b/include/sound/sof/stream.h
@@ -0,0 +1,151 @@
+/* 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) 2018 Intel Corporation
+ */
+
+#ifndef __INCLUDE_SOUND_SOF_STREAM_H__
+#define __INCLUDE_SOUND_SOF_STREAM_H__
+
+#include <sound/sof/header.h>
+
+/*
+ * Stream configuration.
+ */
+
+#define SOF_IPC_MAX_CHANNELS			8
+
+/* common sample rates for use in masks */
+#define SOF_RATE_8000		(1 <<  0) /**< 8000Hz  */
+#define SOF_RATE_11025		(1 <<  1) /**< 11025Hz */
+#define SOF_RATE_12000		(1 <<  2) /**< 12000Hz */
+#define SOF_RATE_16000		(1 <<  3) /**< 16000Hz */
+#define SOF_RATE_22050		(1 <<  4) /**< 22050Hz */
+#define SOF_RATE_24000		(1 <<  5) /**< 24000Hz */
+#define SOF_RATE_32000		(1 <<  6) /**< 32000Hz */
+#define SOF_RATE_44100		(1 <<  7) /**< 44100Hz */
+#define SOF_RATE_48000		(1 <<  8) /**< 48000Hz */
+#define SOF_RATE_64000		(1 <<  9) /**< 64000Hz */
+#define SOF_RATE_88200		(1 << 10) /**< 88200Hz */
+#define SOF_RATE_96000		(1 << 11) /**< 96000Hz */
+#define SOF_RATE_176400		(1 << 12) /**< 176400Hz */
+#define SOF_RATE_192000		(1 << 13) /**< 192000Hz */
+
+/* continuous and non-standard rates for flexibility */
+#define SOF_RATE_CONTINUOUS	(1 << 30)  /**< range */
+#define SOF_RATE_KNOT		(1 << 31)  /**< non-continuous */
+
+/* generic PCM flags for runtime settings */
+#define SOF_PCM_FLAG_XRUN_STOP	(1 << 0) /**< Stop on any XRUN */
+
+/* stream PCM frame format */
+enum sof_ipc_frame {
+	SOF_IPC_FRAME_S16_LE = 0,
+	SOF_IPC_FRAME_S24_4LE,
+	SOF_IPC_FRAME_S32_LE,
+	SOF_IPC_FRAME_FLOAT,
+	/* other formats here */
+};
+
+/* stream buffer format */
+enum sof_ipc_buffer_format {
+	SOF_IPC_BUFFER_INTERLEAVED,
+	SOF_IPC_BUFFER_NONINTERLEAVED,
+	/* other formats here */
+};
+
+/* stream direction */
+enum sof_ipc_stream_direction {
+	SOF_IPC_STREAM_PLAYBACK = 0,
+	SOF_IPC_STREAM_CAPTURE,
+};
+
+/* stream ring info */
+struct sof_ipc_host_buffer {
+	struct sof_ipc_hdr hdr;
+	uint32_t phy_addr;
+	uint32_t pages;
+	uint32_t size;
+	uint32_t reserved[3];
+} __packed;
+
+struct sof_ipc_stream_params {
+	struct sof_ipc_hdr hdr;
+	struct sof_ipc_host_buffer buffer;
+	uint32_t direction;	/**< enum sof_ipc_stream_direction */
+	uint32_t frame_fmt;	/**< enum sof_ipc_frame */
+	uint32_t buffer_fmt;	/**< enum sof_ipc_buffer_format */
+	uint32_t rate;
+	uint16_t stream_tag;
+	uint16_t channels;
+	uint16_t sample_valid_bytes;
+	uint16_t sample_container_bytes;
+
+	uint32_t host_period_bytes;
+	uint16_t no_stream_position; /**< 1 means don't send stream position */
+	uint8_t cont_update_posn; /**< 1 means continuous update stream position */
+	uint8_t reserved0;
+	int16_t ext_data_length; /**< 0, means no extended data */
+	uint8_t reserved[2];
+	uint16_t chmap[SOF_IPC_MAX_CHANNELS];	/**< channel map - SOF_CHMAP_ */
+	uint8_t ext_data[]; /**< extended data */
+} __packed;
+
+/* PCM params info - SOF_IPC_STREAM_PCM_PARAMS */
+struct sof_ipc_pcm_params {
+	struct sof_ipc_cmd_hdr hdr;
+	uint32_t comp_id;
+	uint32_t flags;		/**< generic PCM flags - SOF_PCM_FLAG_ */
+	uint32_t reserved[2];
+	struct sof_ipc_stream_params params;
+}  __packed;
+
+/* PCM params info reply - SOF_IPC_STREAM_PCM_PARAMS_REPLY */
+struct sof_ipc_pcm_params_reply {
+	struct sof_ipc_reply rhdr;
+	uint32_t comp_id;
+	uint32_t posn_offset;
+} __packed;
+
+/* free stream - SOF_IPC_STREAM_PCM_PARAMS */
+struct sof_ipc_stream {
+	struct sof_ipc_cmd_hdr hdr;
+	uint32_t comp_id;
+} __packed;
+
+/* flags indicating which time stamps are in sync with each other */
+#define	SOF_TIME_HOST_SYNC	(1 << 0)
+#define	SOF_TIME_DAI_SYNC	(1 << 1)
+#define	SOF_TIME_WALL_SYNC	(1 << 2)
+#define	SOF_TIME_STAMP_SYNC	(1 << 3)
+
+/* flags indicating which time stamps are valid */
+#define	SOF_TIME_HOST_VALID	(1 << 8)
+#define	SOF_TIME_DAI_VALID	(1 << 9)
+#define	SOF_TIME_WALL_VALID	(1 << 10)
+#define	SOF_TIME_STAMP_VALID	(1 << 11)
+
+/* flags indicating time stamps are 64bit else 3use low 32bit */
+#define	SOF_TIME_HOST_64	(1 << 16)
+#define	SOF_TIME_DAI_64		(1 << 17)
+#define	SOF_TIME_WALL_64	(1 << 18)
+#define	SOF_TIME_STAMP_64	(1 << 19)
+
+struct sof_ipc_stream_posn {
+	struct sof_ipc_reply rhdr;
+	uint32_t comp_id;	/**< host component ID */
+	uint32_t flags;		/**< SOF_TIME_ */
+	uint32_t wallclock_hz;	/**< frequency of wallclock in Hz */
+	uint32_t timestamp_ns;	/**< resolution of timestamp in ns */
+	uint64_t host_posn;	/**< host DMA position in bytes */
+	uint64_t dai_posn;	/**< DAI DMA position in bytes */
+	uint64_t comp_posn;	/**< comp position in bytes */
+	uint64_t wallclock;	/**< audio wall clock */
+	uint64_t timestamp;	/**< system time stamp */
+	uint32_t xrun_comp_id;	/**< comp ID of XRUN component */
+	int32_t xrun_size;	/**< XRUN size in bytes */
+}  __packed;
+
+#endif