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, 26 insertions, 0 deletions

diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile
new file mode 100644
index 000000000..0c109eae1
--- /dev/null
+++ b/arch/mips/ralink/Makefile
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Makefile for the Ralink common stuff
+#
+# Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
+# Copyright (C) 2013 John Crispin <john@phrozen.org>
+
+obj-y := prom.o of.o reset.o
+
+ifndef CONFIG_MIPS_GIC
+	obj-y += clk.o timer.o
+endif
+
+obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
+
+obj-$(CONFIG_IRQ_INTC) += irq.o
+obj-$(CONFIG_MIPS_GIC) += irq-gic.o timer-gic.o
+
+obj-$(CONFIG_SOC_RT288X) += rt288x.o
+obj-$(CONFIG_SOC_RT305X) += rt305x.o
+obj-$(CONFIG_SOC_RT3883) += rt3883.o
+obj-$(CONFIG_SOC_MT7620) += mt7620.o
+obj-$(CONFIG_SOC_MT7621) += mt7621.o
+
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+
+obj-$(CONFIG_DEBUG_FS) += bootrom.o