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, 111 insertions, 0 deletions

diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
new file mode 100644
index 000000000..a972d763e
--- /dev/null
+++ b/drivers/clk/bcm/Kconfig
@@ -0,0 +1,111 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config CLK_BCM2711_DVP
+	tristate "Broadcom BCM2711 DVP support"
+	depends on ARCH_BCM2835 ||COMPILE_TEST
+	depends on COMMON_CLK
+	default ARCH_BCM2835
+	select RESET_CONTROLLER
+	select RESET_SIMPLE
+	help
+	  Enable common clock framework support for the Broadcom BCM2711
+	  DVP Controller.
+
+config CLK_BCM2835
+	bool "Broadcom BCM2835 clock support"
+	depends on ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST
+	depends on COMMON_CLK
+	default ARCH_BCM2835 || ARCH_BRCMSTB
+	help
+	  Enable common clock framework support for Broadcom BCM2835
+	  SoCs.
+
+config CLK_BCM_63XX
+	bool "Broadcom BCM63xx clock support"
+	depends on ARCH_BCMBCA || COMPILE_TEST
+	select COMMON_CLK_IPROC
+	default ARCH_BCMBCA
+	help
+	  Enable common clock framework support for Broadcom BCM63xx DSL SoCs
+	  based on the ARM architecture
+
+config CLK_BCM_63XX_GATE
+	bool "Broadcom BCM63xx gated clock support"
+	depends on BMIPS_GENERIC || COMPILE_TEST
+	default BMIPS_GENERIC
+	help
+	  Enable common clock framework support for Broadcom BCM63xx DSL SoCs
+	  based on the MIPS architecture
+
+config CLK_BCM63268_TIMER
+	bool "Broadcom BCM63268 timer clock and reset support"
+	depends on BMIPS_GENERIC || COMPILE_TEST
+	default BMIPS_GENERIC
+	select RESET_CONTROLLER
+	help
+	  Enable timer clock and reset support for Broadcom BCM63268 DSL SoCs
+	  based on the MIPS architecture.
+
+config CLK_BCM_KONA
+	bool "Broadcom Kona CCU clock support"
+	depends on ARCH_BCM_MOBILE || COMPILE_TEST
+	default ARCH_BCM_MOBILE
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  using "Kona" style clock control units, including those
+	  in the BCM281xx and BCM21664 families.
+
+config COMMON_CLK_IPROC
+	bool
+	help
+	  Enable common clock framework support for Broadcom SoCs
+	  based on the iProc architecture
+
+config CLK_BCM_CYGNUS
+	bool "Broadcom Cygnus clock support"
+	depends on ARCH_BCM_CYGNUS || COMPILE_TEST
+	select COMMON_CLK_IPROC
+	default ARCH_BCM_CYGNUS
+	help
+	  Enable common clock framework support for the Broadcom Cygnus SoC
+
+config CLK_BCM_HR2
+	bool "Broadcom Hurricane 2 clock support"
+	depends on ARCH_BCM_HR2 || COMPILE_TEST
+	select COMMON_CLK_IPROC
+	default ARCH_BCM_HR2
+	help
+	  Enable common clock framework support for the Broadcom Hurricane 2
+	  SoC
+
+config CLK_BCM_NSP
+	bool "Broadcom Northstar/Northstar Plus clock support"
+	depends on ARCH_BCM_5301X || ARCH_BCM_NSP || COMPILE_TEST
+	select COMMON_CLK_IPROC
+	default ARCH_BCM_5301X || ARCH_BCM_NSP
+	help
+	  Enable common clock framework support for the Broadcom Northstar and
+	  Northstar Plus SoCs
+
+config CLK_BCM_NS2
+	bool "Broadcom Northstar 2 clock support"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	select COMMON_CLK_IPROC
+	default ARCH_BCM_IPROC
+	help
+	  Enable common clock framework support for the Broadcom Northstar 2 SoC
+
+config CLK_BCM_SR
+	bool "Broadcom Stingray clock support"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	select COMMON_CLK_IPROC
+	default ARCH_BCM_IPROC
+	help
+	  Enable common clock framework support for the Broadcom Stingray SoC
+
+config CLK_RASPBERRYPI
+	tristate "Raspberry Pi firmware based clock support"
+	depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
+	help
+	  Enable common clock framework support for Raspberry Pi's firmware
+	  dependent clocks