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, 56 insertions, 0 deletions

diff --git a/drivers/pinctrl/aspeed/Kconfig b/drivers/pinctrl/aspeed/Kconfig
new file mode 100644
index 000000000..8e1d4da08
--- /dev/null
+++ b/drivers/pinctrl/aspeed/Kconfig
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config PINCTRL_ASPEED
+	bool
+	depends on (ARCH_ASPEED || COMPILE_TEST) && OF
+	select MFD_SYSCON
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+
+config PINCTRL_ASPEED_G4
+	bool "Aspeed G4 SoC pin control"
+	depends on (MACH_ASPEED_G4 || COMPILE_TEST) && OF
+	select PINCTRL_ASPEED
+	help
+	  Say Y here to enable pin controller support for Aspeed's 4th
+	  generation SoCs. GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_ASPEED_G5
+	bool "Aspeed G5 SoC pin control"
+	depends on (MACH_ASPEED_G5 || COMPILE_TEST) && OF
+	select PINCTRL_ASPEED
+	help
+	  Say Y here to enable pin controller support for Aspeed's 5th
+	  generation SoCs. GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_ASPEED_G6
+	bool "Aspeed G6 SoC pin control"
+	depends on (MACH_ASPEED_G6 || COMPILE_TEST) && OF
+	select PINCTRL_ASPEED
+	help
+	  Say Y here to enable pin controller support for Aspeed's 6th
+	  generation SoCs. GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_ASPEED_G7_SOC0
+	bool "Aspeed G7 SoC pin control"
+	depends on (ARCH_ASPEED || COMPILE_TEST) && OF
+	select PINCTRL_ASPEED
+	help
+	  Say Y here to enable pin controller support for the SoC0 instance
+	  of Aspeed's 7th generation SoCs. GPIO is provided by a separate
+	  GPIO driver.
+
+config PINCTRL_ASPEED_G7_SOC1
+	bool "Aspeed G7 SoC1 pin control"
+	depends on (ARCH_ASPEED || COMPILE_TEST) && OF
+	select MFD_SYSCON
+	select PINMUX
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+	help
+	  Say Y here to enable pin controller support for the SoC1 instance
+	  of Aspeed's 7th generation SoCs. GPIO is provided by a separate
+	  GPIO driver.