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, 38 insertions, 0 deletions

diff --git a/include/sound/sdca_jack.h b/include/sound/sdca_jack.h
new file mode 100644
index 000000000..871ba2d81
--- /dev/null
+++ b/include/sound/sdca_jack.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * The MIPI SDCA specification is available for public downloads at
+ * https://www.mipi.org/mipi-sdca-v1-0-download
+ *
+ * Copyright (C) 2025 Cirrus Logic, Inc. and
+ *                    Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef __SDCA_JACK_H__
+#define __SDCA_JACK_H__
+
+struct sdca_interrupt;
+struct snd_kcontrol;
+struct snd_soc_jack;
+
+/**
+ * struct jack_state - Jack state structure to keep data between interrupts
+ * @kctl: Pointer to the ALSA control attached to this jack
+ * @jack: Pointer to the ASoC jack struct for this jack
+ * @mask: Possible reported jack status bits for this jack
+ */
+struct jack_state {
+	struct snd_kcontrol *kctl;
+	struct snd_soc_jack *jack;
+
+	unsigned int mask;
+};
+
+int sdca_jack_alloc_state(struct sdca_interrupt *interrupt);
+int sdca_jack_init_state(struct sdca_interrupt *interrupt);
+void sdca_jack_free_state(struct sdca_interrupt *interrupt);
+
+int sdca_jack_process(struct sdca_interrupt *interrupt);
+int sdca_jack_set_jack(struct sdca_interrupt_info *info, struct snd_soc_jack *jack);
+int sdca_jack_report(struct sdca_interrupt *interrupt);
+
+#endif // __SDCA_JACK_H__