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, 78 insertions, 0 deletions

diff --git a/arch/mips/ingenic/Kconfig b/arch/mips/ingenic/Kconfig
new file mode 100644
index 000000000..f595b339a
--- /dev/null
+++ b/arch/mips/ingenic/Kconfig
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config MACH_INGENIC_GENERIC
+	bool
+	select MACH_INGENIC
+	select MACH_JZ4740
+	select MACH_JZ4725B
+	select MACH_JZ4770
+	select MACH_JZ4780
+	select MACH_X1000
+	select MACH_X1830
+
+choice
+	prompt "Machine type"
+	depends on MACH_INGENIC_SOC
+	default INGENIC_GENERIC_BOARD
+
+config INGENIC_GENERIC_BOARD
+	bool "Generic board"
+	select MACH_INGENIC_GENERIC
+
+config JZ4740_QI_LB60
+	bool "Qi Hardware Ben NanoNote"
+	select MACH_JZ4740
+
+config JZ4740_RS90
+	bool "YLM RetroMini (RS-90)"
+	select MACH_JZ4725B
+
+config JZ4770_GCW0
+	bool "Game Consoles Worldwide GCW Zero"
+	select MACH_JZ4770
+
+config JZ4780_CI20
+	bool "MIPS Creator CI20"
+	select MACH_JZ4780
+
+config X1000_CU1000_NEO
+	bool "YSH & ATIL CU1000 Module with Neo backplane"
+	select MACH_X1000
+
+config X1830_CU1830_NEO
+	bool "YSH & ATIL CU1830 Module with Neo backplane"
+	select MACH_X1830
+
+endchoice
+
+config MACH_JZ4725B
+	bool
+	select SYS_HAS_CPU_MIPS32_R1
+
+config MACH_JZ4740
+	bool
+	select SYS_HAS_CPU_MIPS32_R1
+
+config MACH_JZ4770
+	bool
+	select MIPS_CPU_SCACHE
+	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_SUPPORTS_HIGHMEM
+
+config MACH_JZ4780
+	bool
+	select MIPS_CPU_SCACHE
+	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_SUPPORTS_HIGHMEM
+
+config MACH_X1000
+	bool
+	select MIPS_CPU_SCACHE
+	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_SUPPORTS_HIGHMEM
+
+config MACH_X1830
+	bool
+	select MIPS_CPU_SCACHE
+	select SYS_HAS_CPU_MIPS32_R2
+	select SYS_SUPPORTS_HIGHMEM