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, 45 insertions, 0 deletions

diff --git a/arch/arm/mach-aspeed/Kconfig b/arch/arm/mach-aspeed/Kconfig
new file mode 100644
index 000000000..fcf287edd
--- /dev/null
+++ b/arch/arm/mach-aspeed/Kconfig
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig ARCH_ASPEED
+	bool "Aspeed BMC architectures"
+	depends on (CPU_LITTLE_ENDIAN && ARCH_MULTI_V5) || ARCH_MULTI_V6 || ARCH_MULTI_V7
+	select WATCHDOG
+	select ASPEED_WATCHDOG
+	select MFD_SYSCON
+	select PINCTRL
+	help
+	  Say Y here if you want to run your kernel on an ASpeed BMC SoC.
+
+if ARCH_ASPEED
+
+config MACH_ASPEED_G4
+	bool "Aspeed SoC 4th Generation"
+	depends on ARCH_MULTI_V5
+	select CPU_ARM926T
+	select PINCTRL_ASPEED_G4
+	select FTTMR010_TIMER
+	help
+	  Say yes if you intend to run on an Aspeed ast2400 or similar
+	  fourth generation BMCs, such as those used by OpenPower Power8
+	  systems.
+
+config MACH_ASPEED_G5
+	bool "Aspeed SoC 5th Generation"
+	depends on ARCH_MULTI_V6
+	select PINCTRL_ASPEED_G5
+	select FTTMR010_TIMER
+	help
+	  Say yes if you intend to run on an Aspeed ast2500 or similar
+	  fifth generation Aspeed BMCs.
+
+config MACH_ASPEED_G6
+	bool "Aspeed SoC 6th Generation"
+	depends on ARCH_MULTI_V7
+	select CPU_V7
+	select PINCTRL_ASPEED_G6
+	select ARM_GIC
+	select HAVE_ARM_ARCH_TIMER
+	help
+	  Say yes if you intend to run on an Aspeed ast2600 or similar
+	  sixth generation Aspeed BMCs.
+
+endif