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, 26 insertions, 0 deletions

diff --git a/drivers/pinctrl/pxa/Kconfig b/drivers/pinctrl/pxa/Kconfig
new file mode 100644
index 000000000..2f4a86708
--- /dev/null
+++ b/drivers/pinctrl/pxa/Kconfig
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if (ARCH_PXA || COMPILE_TEST)
+
+config PINCTRL_PXA
+	bool
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+
+config PINCTRL_PXA25X
+	tristate "Marvell PXA25x pin controller driver"
+	select PINCTRL_PXA
+	default y if PXA25x
+	help
+	  This is the pinctrl, pinmux, pinconf driver for the Marvell
+	  PXA2xx block found in the pxa25x platforms.
+
+config PINCTRL_PXA27X
+	tristate "Marvell PXA27x pin controller driver"
+	select PINCTRL_PXA
+	default y if PXA27x
+	help
+	  This is the pinctrl, pinmux, pinconf driver for the Marvell
+	  PXA2xx block found in the pxa27x platforms.
+
+endif