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, 92 insertions, 0 deletions

diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
new file mode 100644
index 000000000..1af4fc320
--- /dev/null
+++ b/drivers/pinctrl/meson/Kconfig
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig PINCTRL_MESON
+	tristate "Amlogic SoC pinctrl drivers"
+	depends on ARCH_MESON || COMPILE_TEST
+	depends on OF
+	default ARCH_MESON
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select REGMAP_MMIO
+
+if PINCTRL_MESON
+
+config PINCTRL_MESON8
+	bool "Meson 8 SoC pinctrl driver"
+	depends on ARM || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON8B
+	bool "Meson 8b SoC pinctrl driver"
+	depends on ARM || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_GXBB
+	tristate "Meson gxbb SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_GXL
+	tristate "Meson gxl SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON8_PMX
+	tristate
+
+config PINCTRL_MESON_AXG
+	tristate "Meson axg Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_AXG_PMX
+	tristate
+
+config PINCTRL_MESON_G12A
+	tristate "Meson g12a Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_A1
+	tristate "Meson a1 Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_S4
+	tristate "Meson s4 Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_AMLOGIC_A4
+	bool "AMLOGIC pincontrol"
+	depends on ARM64 || COMPILE_TEST
+	default ARCH_MESON
+	help
+	  This is the driver for the pin controller found on Amlogic SoCs.
+
+	  This driver is simplify subsequent support for new amlogic SoCs,
+	  to support new Amlogic SoCs, only need to add the corresponding dts file,
+	  no additional binding header files or C file are added.
+
+config PINCTRL_AMLOGIC_C3
+	tristate "Amlogic C3 SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_AMLOGIC_T7
+	tristate "Amlogic T7 SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+endif