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, 131 insertions, 0 deletions

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
new file mode 100644
index 000000000..b292e7ca5
--- /dev/null
+++ b/drivers/clk/imx/Kconfig
@@ -0,0 +1,131 @@
+# SPDX-License-Identifier: GPL-2.0
+# common clock support for NXP i.MX SoC family.
+config MXC_CLK
+	tristate "IMX clock"
+	depends on ARCH_MXC || COMPILE_TEST
+
+config MXC_CLK_SCU
+	tristate
+
+config CLK_IMX1
+	def_bool SOC_IMX1
+	select MXC_CLK
+
+config CLK_IMX25
+	def_bool SOC_IMX25
+	select MXC_CLK
+
+config CLK_IMX27
+	def_bool SOC_IMX27
+	select MXC_CLK
+
+config CLK_IMX31
+	def_bool SOC_IMX31
+	select MXC_CLK
+
+config CLK_IMX35
+	def_bool SOC_IMX35
+	select MXC_CLK
+
+config CLK_IMX5
+	def_bool SOC_IMX5
+	select MXC_CLK
+
+config CLK_IMX6Q
+	def_bool SOC_IMX6Q
+	select MXC_CLK
+
+config CLK_IMX6SL
+	def_bool SOC_IMX6SL
+	select MXC_CLK
+
+config CLK_IMX6SLL
+	def_bool SOC_IMX6SLL
+	select MXC_CLK
+
+config CLK_IMX6SX
+	def_bool SOC_IMX6SX
+	select MXC_CLK
+
+config CLK_IMX6UL
+	def_bool SOC_IMX6UL
+	select MXC_CLK
+
+config CLK_IMX7D
+	def_bool SOC_IMX7D
+	select MXC_CLK
+
+config CLK_IMX7ULP
+	def_bool SOC_IMX7ULP
+	select MXC_CLK
+
+config CLK_VF610
+	def_bool SOC_VF610
+	select MXC_CLK
+
+config CLK_IMX8MM
+	tristate "IMX8MM CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MM CCM Clock Driver
+
+config CLK_IMX8MN
+	tristate "IMX8MN CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MN CCM Clock Driver
+
+config CLK_IMX8MP
+	tristate "IMX8MP CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	select AUXILIARY_BUS if RESET_CONTROLLER
+	help
+	    Build the driver for i.MX8MP CCM Clock Driver
+
+config CLK_IMX8MQ
+	tristate "IMX8MQ CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MQ CCM Clock Driver
+
+config CLK_IMX8QXP
+	tristate "IMX8QXP SCU Clock"
+	depends on (ARCH_MXC && ARM64) || COMPILE_TEST
+	depends on IMX_SCU && HAVE_ARM_SMCCC
+	select MXC_CLK_SCU
+	select MXC_CLK
+	help
+	  Build the driver for IMX8QXP SCU based clocks.
+
+config CLK_IMX8ULP
+	tristate "IMX8ULP CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	select AUXILIARY_BUS
+	help
+	    Build the driver for i.MX8ULP CCM Clock Driver
+
+config CLK_IMX93
+	tristate "IMX93 CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX93 CCM Clock Driver
+
+config CLK_IMX95_BLK_CTL
+	tristate "IMX95 Clock Driver for BLK CTL"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the clock driver for i.MX95 BLK CTL
+
+config CLK_IMXRT1050
+	tristate "IMXRT1050 CCM Clock Driver"
+	depends on SOC_IMXRT || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MXRT1050 CCM Clock Driver