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, 75 insertions, 0 deletions

diff --git a/drivers/pinctrl/stm32/Kconfig b/drivers/pinctrl/stm32/Kconfig
new file mode 100644
index 000000000..d6a171523
--- /dev/null
+++ b/drivers/pinctrl/stm32/Kconfig
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if ARCH_STM32 || COMPILE_TEST
+
+config PINCTRL_STM32
+	tristate
+	depends on OF
+	select PINMUX
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select IRQ_DOMAIN_HIERARCHY
+	select MFD_SYSCON
+
+config PINCTRL_STM32F429
+	bool "STMicroelectronics STM32F429 pin control" if COMPILE_TEST && !MACH_STM32F429
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F429
+	select PINCTRL_STM32
+
+config PINCTRL_STM32F469
+	bool "STMicroelectronics STM32F469 pin control" if COMPILE_TEST && !MACH_STM32F469
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F469
+	select PINCTRL_STM32
+
+config PINCTRL_STM32F746
+	bool "STMicroelectronics STM32F746 pin control" if COMPILE_TEST && !MACH_STM32F746
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F746
+	select PINCTRL_STM32
+
+config PINCTRL_STM32F769
+	bool "STMicroelectronics STM32F769 pin control" if COMPILE_TEST && !MACH_STM32F769
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F769
+	select PINCTRL_STM32
+
+config PINCTRL_STM32H743
+	bool "STMicroelectronics STM32H743 pin control" if COMPILE_TEST && !MACH_STM32H743
+	depends on OF && HAS_IOMEM
+	default MACH_STM32H743
+	select PINCTRL_STM32
+
+config PINCTRL_STM32MP135
+	bool "STMicroelectronics STM32MP135 pin control" if COMPILE_TEST && !MACH_STM32MP13
+	depends on OF && HAS_IOMEM
+	default MACH_STM32MP13
+	select PINCTRL_STM32
+
+config PINCTRL_STM32MP157
+	bool "STMicroelectronics STM32MP157 pin control" if COMPILE_TEST && !MACH_STM32MP157
+	depends on OF && HAS_IOMEM
+	default MACH_STM32MP157
+	select PINCTRL_STM32
+
+config PINCTRL_STM32MP257
+	tristate "STMicroelectronics STM32MP257 pin control"
+	depends on OF && HAS_IOMEM
+	default MACH_STM32MP25 || (ARCH_STM32 && ARM64)
+	select PINCTRL_STM32
+
+config PINCTRL_STM32_HDP
+	tristate "STMicroelectronics STM32 Hardware Debug Port (HDP) pin control"
+	depends on OF && HAS_IOMEM
+	default ARCH_STM32 && !ARM_SINGLE_ARMV7M
+	select PINMUX
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select GPIO_GENERIC
+	help
+	  The Hardware Debug Port allows the observation of internal signals.
+	  It uses configurable multiplexer to route signals in a dedicated observation register.
+	  This driver also permits the observation of signals on external SoC pins.
+	  It permits the observation of up to 16 signals per HDP line.
+
+endif