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, 21 insertions, 0 deletions

diff --git a/drivers/pinctrl/sunplus/Kconfig b/drivers/pinctrl/sunplus/Kconfig
new file mode 100644
index 000000000..69f82590f
--- /dev/null
+++ b/drivers/pinctrl/sunplus/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Sunplus Pin control driver configuration
+#
+
+config PINCTRL_SPPCTL
+	tristate "Sunplus SP7021 PinMux and GPIO driver"
+	depends on SOC_SP7021
+	depends on OF && HAS_IOMEM
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GENERIC_PINCONF
+	select PINCONF
+	select PINMUX
+	select GPIOLIB
+	help
+	  Say Y here to support Sunplus SP7021 pinmux controller.
+	  This driver requires the pinctrl framework.
+	  GPIO is provided by the same driver.
+	  To compile this driver as a module, choose M here.
+	  The module will be called sppinctrl.