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, 41 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/mb86a16.h b/drivers/media/dvb-frontends/mb86a16.h
new file mode 100644
index 000000000..c0c541928
--- /dev/null
+++ b/drivers/media/dvb-frontends/mb86a16.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+	Fujitsu MB86A16 DVB-S/DSS DC Receiver driver
+
+	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
+
+*/
+
+#ifndef __MB86A16_H
+#define __MB86A16_H
+
+#include <linux/dvb/frontend.h>
+#include <media/dvb_frontend.h>
+
+
+struct mb86a16_config {
+	u8 demod_address;
+
+	int (*set_voltage)(struct dvb_frontend *fe,
+			   enum fe_sec_voltage voltage);
+};
+
+
+
+#if IS_REACHABLE(CONFIG_DVB_MB86A16)
+
+extern struct dvb_frontend *mb86a16_attach(const struct mb86a16_config *config,
+					   struct i2c_adapter *i2c_adap);
+
+#else
+
+static inline struct dvb_frontend *mb86a16_attach(const struct mb86a16_config *config,
+					   struct i2c_adapter *i2c_adap)
+{
+	printk(KERN_WARNING "%s: Driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+
+#endif /* CONFIG_DVB_MB86A16 */
+
+#endif /* __MB86A16_H */