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, 77 insertions, 0 deletions

diff --git a/sound/soc/codecs/lpass-macro-common.h b/sound/soc/codecs/lpass-macro-common.h
new file mode 100644
index 000000000..10ad68201
--- /dev/null
+++ b/sound/soc/codecs/lpass-macro-common.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __LPASS_MACRO_COMMON_H__
+#define __LPASS_MACRO_COMMON_H__
+
+/* NPL clock is expected */
+#define LPASS_MACRO_FLAG_HAS_NPL_CLOCK		BIT(0)
+/* The soundwire block should be internally reset at probe */
+#define LPASS_MACRO_FLAG_RESET_SWR		BIT(1)
+
+enum lpass_version {
+	LPASS_VER_9_0_0,
+	LPASS_VER_9_2_0,
+	LPASS_VER_10_0_0,
+	LPASS_VER_11_0_0,
+};
+
+enum lpass_codec_version {
+	LPASS_CODEC_VERSION_UNKNOWN,
+	LPASS_CODEC_VERSION_1_0,
+	LPASS_CODEC_VERSION_1_1,
+	LPASS_CODEC_VERSION_1_2,
+	LPASS_CODEC_VERSION_2_0,
+	LPASS_CODEC_VERSION_2_1,
+	LPASS_CODEC_VERSION_2_5,
+	LPASS_CODEC_VERSION_2_6,
+	LPASS_CODEC_VERSION_2_7,
+	LPASS_CODEC_VERSION_2_8,
+	LPASS_CODEC_VERSION_2_9,
+};
+
+struct lpass_macro {
+	struct device *macro_pd;
+	struct device *dcodec_pd;
+};
+
+struct lpass_macro *lpass_macro_pds_init(struct device *dev);
+void lpass_macro_pds_exit(struct lpass_macro *pds);
+void lpass_macro_set_codec_version(enum lpass_codec_version version);
+enum lpass_codec_version lpass_macro_get_codec_version(void);
+
+static inline void lpass_macro_pds_exit_action(void *pds)
+{
+	lpass_macro_pds_exit(pds);
+}
+
+static inline const char *lpass_macro_get_codec_version_string(int version)
+{
+	switch (version) {
+	case LPASS_CODEC_VERSION_1_0:
+		return "v1.0";
+	case LPASS_CODEC_VERSION_1_1:
+		return "v1.1";
+	case LPASS_CODEC_VERSION_1_2:
+		return "v1.2";
+	case LPASS_CODEC_VERSION_2_0:
+		return "v2.0";
+	case LPASS_CODEC_VERSION_2_1:
+		return "v2.1";
+	case LPASS_CODEC_VERSION_2_5:
+		return "v2.5";
+	case LPASS_CODEC_VERSION_2_6:
+		return "v2.6";
+	case LPASS_CODEC_VERSION_2_7:
+		return "v2.7";
+	case LPASS_CODEC_VERSION_2_8:
+		return "v2.8";
+	default:
+		break;
+	}
+	return "NA";
+}
+
+#endif /* __LPASS_MACRO_COMMON_H__ */