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, 48 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/tda10086.h b/drivers/media/dvb-frontends/tda10086.h
new file mode 100644
index 000000000..8776fadbd
--- /dev/null
+++ b/drivers/media/dvb-frontends/tda10086.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+  /*
+     Driver for Philips tda10086 DVBS Frontend
+
+     (c) 2006 Andrew de Quincey
+
+
+   */
+
+#ifndef TDA10086_H
+#define TDA10086_H
+
+#include <linux/dvb/frontend.h>
+#include <linux/firmware.h>
+
+enum tda10086_xtal {
+	TDA10086_XTAL_16M,
+	TDA10086_XTAL_4M
+};
+
+struct tda10086_config
+{
+	/* the demodulator's i2c address */
+	u8 demod_address;
+
+	/* does the "inversion" need inverted? */
+	u8 invert;
+
+	/* do we need the diseqc signal with carrier? */
+	u8 diseqc_tone;
+
+	/* frequency of the reference xtal */
+	enum tda10086_xtal xtal_freq;
+};
+
+#if IS_REACHABLE(CONFIG_DVB_TDA10086)
+extern struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
+					    struct i2c_adapter* i2c);
+#else
+static inline struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
+						   struct i2c_adapter* i2c)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif /* CONFIG_DVB_TDA10086 */
+
+#endif /* TDA10086_H */