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, 88 insertions, 0 deletions

diff --git a/drivers/pinctrl/sophgo/Kconfig b/drivers/pinctrl/sophgo/Kconfig
new file mode 100644
index 000000000..9b0a3a475
--- /dev/null
+++ b/drivers/pinctrl/sophgo/Kconfig
@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Sophgo SoC PINCTRL drivers
+#
+
+config PINCTRL_SOPHGO_COMMON
+	tristate
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GENERIC_PINCONF
+
+config PINCTRL_SOPHGO_CV18XX_OPS
+	bool
+
+config PINCTRL_SOPHGO_CV1800B
+	tristate "Sophgo CV1800B SoC Pinctrl driver"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on OF
+	select PINCTRL_SOPHGO_COMMON
+	select PINCTRL_SOPHGO_CV18XX_OPS
+	help
+	  Say Y to select the pinctrl driver for CV1800B SoC.
+	  This pin controller allows selecting the mux function for
+	  each pin. This driver can also be built as a module called
+	  pinctrl-cv1800b.
+
+config PINCTRL_SOPHGO_CV1812H
+	tristate "Sophgo CV1812H SoC Pinctrl driver"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on OF
+	select PINCTRL_SOPHGO_COMMON
+	select PINCTRL_SOPHGO_CV18XX_OPS
+	help
+	  Say Y to select the pinctrl driver for CV1812H SoC.
+	  This pin controller allows selecting the mux function for
+	  each pin. This driver can also be built as a module called
+	  pinctrl-cv1812h.
+
+config PINCTRL_SOPHGO_SG2000
+	tristate "Sophgo SG2000 SoC Pinctrl driver"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on OF
+	select PINCTRL_SOPHGO_COMMON
+	select PINCTRL_SOPHGO_CV18XX_OPS
+	help
+	  Say Y to select the pinctrl driver for SG2000 SoC.
+	  This pin controller allows selecting the mux function for
+	  each pin. This driver can also be built as a module called
+	  pinctrl-sg2000.
+
+config PINCTRL_SOPHGO_SG2002
+	tristate "Sophgo SG2002 SoC Pinctrl driver"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on OF
+	select PINCTRL_SOPHGO_COMMON
+	select PINCTRL_SOPHGO_CV18XX_OPS
+	help
+	  Say Y to select the pinctrl driver for SG2002 SoC.
+	  This pin controller allows selecting the mux function for
+	  each pin. This driver can also be built as a module called
+	  pinctrl-sg2002.
+
+config PINCTRL_SOPHGO_SG2042_OPS
+	bool
+
+config PINCTRL_SOPHGO_SG2042
+	tristate "Sophgo SG2042 SoC Pinctrl driver"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on OF
+	select PINCTRL_SOPHGO_COMMON
+	select PINCTRL_SOPHGO_SG2042_OPS
+	help
+	  Say Y to select the pinctrl driver for SG2042 SoC.
+	  This pin controller allows selecting the mux function for
+	  each pin. This driver can also be built as a module called
+	  pinctrl-sg2042.
+
+config PINCTRL_SOPHGO_SG2044
+	tristate "Sophgo SG2044 SoC Pinctrl driver"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	depends on OF
+	select PINCTRL_SOPHGO_COMMON
+	select PINCTRL_SOPHGO_SG2042_OPS
+	help
+	  Say Y to select the pinctrl driver for SG2044 SoC.
+	  This pin controller allows selecting the mux function for
+	  each pin. This driver can also be built as a module called
+	  pinctrl-sg2044.