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, 17 insertions, 0 deletions

diff --git a/sound/soc/codecs/pcm1789.h b/sound/soc/codecs/pcm1789.h
new file mode 100644
index 000000000..79439c832
--- /dev/null
+++ b/sound/soc/codecs/pcm1789.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+// Definitions for PCM1789 audio driver
+// Copyright (C) 2018 Bootlin
+// Mylène Josserand <mylene.josserand@bootlin.com>
+
+#ifndef __PCM1789_H__
+#define __PCM1789_H__
+
+#define PCM1789_FORMATS (SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE | \
+			 SNDRV_PCM_FMTBIT_S16_LE)
+
+extern const struct regmap_config pcm1789_regmap_config;
+
+int pcm1789_common_init(struct device *dev, struct regmap *regmap);
+void pcm1789_common_exit(struct device *dev);
+
+#endif