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, 20 insertions, 0 deletions

diff --git a/arch/m68k/68000/Makefile b/arch/m68k/68000/Makefile
new file mode 100644
index 000000000..279560add
--- /dev/null
+++ b/arch/m68k/68000/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+##################################################
+#
+# Makefile for 68000 core based cpus
+#
+# 2012.10.21, Luis Alves <ljalvs@gmail.com>
+#             Merged all 68000 based cpu's config
+#             files into a single directory.
+#
+
+# 68328, 68EZ328, 68VZ328
+
+obj-y			+= entry.o ints.o timers.o m68328.o
+obj-$(CONFIG_ROM)	+= romvec.o
+
+obj-$(CONFIG_DRAGEN2)	+= dragen2.o
+obj-$(CONFIG_UCSIMM)	+= ucsimm.o
+obj-$(CONFIG_UCDIMM)	+= ucsimm.o
+
+obj-y			+= head.o