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, 232 insertions, 0 deletions

diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
new file mode 100644
index 000000000..cf8cf3f9e
--- /dev/null
+++ b/drivers/clk/meson/Kconfig
@@ -0,0 +1,232 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "Clock support for Amlogic platforms"
+	depends on ARCH_MESON || COMPILE_TEST
+
+config COMMON_CLK_MESON_REGMAP
+	tristate
+	select REGMAP
+	select MFD_SYSCON
+
+config COMMON_CLK_MESON_DUALDIV
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_MPLL
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_PHASE
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_PLL
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_SCLK_DIV
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_VID_PLL_DIV
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_VCLK
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON_CLKC_UTILS
+	select REGMAP
+	select MFD_SYSCON
+	tristate
+
+config COMMON_CLK_MESON_AO_CLKC
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select RESET_CONTROLLER
+
+config COMMON_CLK_MESON_CPU_DYNDIV
+	tristate
+	select COMMON_CLK_MESON_REGMAP
+
+config COMMON_CLK_MESON8B
+	bool "Meson8 SoC Clock controller support"
+	depends on ARM
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_MPLL
+	select COMMON_CLK_MESON_PLL
+	select MFD_SYSCON
+	select RESET_CONTROLLER
+	help
+	  Support for the clock controller on AmLogic S802 (Meson8),
+	  S805 (Meson8b) and S812 (Meson8m2) devices. Say Y if you
+	  want peripherals and CPU frequency scaling to work.
+
+config COMMON_CLK_GXBB
+	tristate "GXBB and GXL SoC clock controllers support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_DUALDIV
+	select COMMON_CLK_MESON_VID_PLL_DIV
+	select COMMON_CLK_MESON_MPLL
+	select COMMON_CLK_MESON_PLL
+	select COMMON_CLK_MESON_AO_CLKC
+	select MFD_SYSCON
+	help
+	  Support for the clock controller on AmLogic S905 devices, aka gxbb.
+	  Say Y if you want peripherals and CPU frequency scaling to work.
+
+config COMMON_CLK_AXG
+	tristate "AXG SoC clock controllers support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_DUALDIV
+	select COMMON_CLK_MESON_MPLL
+	select COMMON_CLK_MESON_PLL
+	select COMMON_CLK_MESON_AO_CLKC
+	select MFD_SYSCON
+	help
+	  Support for the clock controller on AmLogic A113D devices, aka axg.
+	  Say Y if you want peripherals and CPU frequency scaling to work.
+
+config COMMON_CLK_AXG_AUDIO
+	tristate "Meson AXG Audio Clock Controller Driver"
+	depends on ARM64
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_PHASE
+	select COMMON_CLK_MESON_SCLK_DIV
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select REGMAP_MMIO
+	select AUXILIARY_BUS
+	imply RESET_MESON_AUX
+	help
+	  Support for the audio clock controller on AmLogic A113D devices,
+	  aka axg, Say Y if you want audio subsystem to work.
+
+config COMMON_CLK_A1_PLL
+	tristate "Amlogic A1 SoC PLL controller support"
+	depends on ARM64
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_PLL
+	help
+	  Support for the PLL clock controller on Amlogic A113L based
+	  device, A1 SoC Family. Say Y if you want A1 PLL clock controller
+	  to work.
+
+config COMMON_CLK_A1_PERIPHERALS
+	tristate "Amlogic A1 SoC Peripherals clock controller support"
+	depends on ARM64
+	select COMMON_CLK_MESON_DUALDIV
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	help
+	  Support for the Peripherals clock controller on Amlogic A113L based
+	  device, A1 SoC Family. Say Y if you want A1 Peripherals clock
+	  controller to work.
+
+config COMMON_CLK_C3_PLL
+	tristate "Amlogic C3 PLL clock controller"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_PLL
+	select COMMON_CLK_MESON_CLKC_UTILS
+	imply COMMON_CLK_SCMI
+	help
+	  Support for the PLL clock controller on Amlogic C302X and C308L devices,
+	  AKA C3. Say Y if you want the board to work, because PLLs are the parent
+	  of most peripherals.
+
+config COMMON_CLK_C3_PERIPHERALS
+	tristate "Amlogic C3 peripherals clock controller"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_DUALDIV
+	select COMMON_CLK_MESON_CLKC_UTILS
+	imply COMMON_CLK_SCMI
+	imply COMMON_CLK_C3_PLL
+	help
+	  Support for the Peripherals clock controller on Amlogic C302X and
+	  C308L devices, AKA C3. Say Y if you want the peripherals clock to
+	  work.
+
+config COMMON_CLK_G12A
+	tristate "G12 and SM1 SoC clock controllers support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_DUALDIV
+	select COMMON_CLK_MESON_MPLL
+	select COMMON_CLK_MESON_PLL
+	select COMMON_CLK_MESON_AO_CLKC
+	select COMMON_CLK_MESON_CPU_DYNDIV
+	select COMMON_CLK_MESON_VID_PLL_DIV
+	select COMMON_CLK_MESON_VCLK
+	select MFD_SYSCON
+	help
+	  Support for the clock controller on Amlogic S905D2, S905X2 and S905Y2
+	  devices, aka g12a. Say Y if you want peripherals to work.
+
+config COMMON_CLK_S4_PLL
+	tristate "S4 SoC PLL clock controllers support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_MPLL
+	select COMMON_CLK_MESON_PLL
+	select COMMON_CLK_MESON_REGMAP
+	help
+	  Support for the PLL clock controller on Amlogic S805X2 and S905Y4 devices,
+	  AKA S4. Say Y if you want the board to work, because PLLs are the parent of
+	  most peripherals.
+
+config COMMON_CLK_S4_PERIPHERALS
+	tristate "S4 SoC peripherals clock controllers support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_DUALDIV
+	select COMMON_CLK_MESON_VID_PLL_DIV
+	help
+	  Support for the peripherals clock controller on Amlogic S805X2 and S905Y4
+	  devices, AKA S4. Say Y if you want S4 peripherals clock controller to work.
+
+config COMMON_CLK_T7_PLL
+	tristate "Amlogic T7 SoC PLL controller support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_MPLL
+	select COMMON_CLK_MESON_PLL
+	imply COMMON_CLK_SCMI
+	help
+	  Support for the PLL clock controller on Amlogic A311D2 based
+	  device, AKA T7. PLLs are required by most peripheral to operate.
+	  Say Y if you want T7 PLL clock controller to work.
+
+config COMMON_CLK_T7_PERIPHERALS
+	tristate "Amlogic T7 SoC peripherals clock controller support"
+	depends on ARM64
+	default ARCH_MESON
+	select COMMON_CLK_MESON_REGMAP
+	select COMMON_CLK_MESON_CLKC_UTILS
+	select COMMON_CLK_MESON_DUALDIV
+	imply COMMON_CLK_SCMI
+	imply COMMON_CLK_T7_PLL
+	help
+	  Support for the peripherals clock controller on Amlogic A311D2 based
+	  device, AKA T7. Peripherals are required by most peripheral to operate.
+	  Say Y if you want T7 peripherals clock controller to work.
+endmenu