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, 30 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8580.h b/sound/soc/codecs/wm8580.h
new file mode 100644
index 000000000..34f7fee6b
--- /dev/null
+++ b/sound/soc/codecs/wm8580.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * wm8580.h  --  audio driver for WM8580
+ *
+ * Copyright 2008 Samsung Electronics.
+ * Author: Ryu Euiyoul
+ *         ryu.real@gmail.com
+ */
+
+#ifndef _WM8580_H
+#define _WM8580_H
+
+#define WM8580_PLLA  1
+#define WM8580_PLLB  2
+
+#define WM8580_MCLK       1
+#define WM8580_CLKOUTSRC  2
+
+#define WM8580_CLKSRC_MCLK    1
+#define WM8580_CLKSRC_PLLA    2
+#define WM8580_CLKSRC_PLLB    3
+#define WM8580_CLKSRC_OSC     4
+#define WM8580_CLKSRC_NONE    5
+#define WM8580_CLKSRC_ADCMCLK 6
+
+#define WM8580_DAI_PAIFRX 0
+#define WM8580_DAI_PAIFTX 1
+
+#endif
+