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/scripts/livepatch/Makefile b/scripts/livepatch/Makefile
new file mode 100644
index 000000000..17b590213
--- /dev/null
+++ b/scripts/livepatch/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0
+# Standalone Makefile for developer tooling (not part of kbuild).
+
+SHELLCHECK := $(shell which shellcheck 2> /dev/null)
+
+SRCS := \
+  klp-build
+
+.DEFAULT_GOAL := help
+.PHONY: help
+help:
+	@echo "  check      - Run shellcheck on $(SRCS)"
+	@echo "  help       - Show this help message"
+
+.PHONY: check
+check:
+ifndef SHELLCHECK
+	$(error shellcheck is not installed. Please install it to run checks)
+endif
+	@$(SHELLCHECK) $(SHELLCHECK_OPTIONS) $(SRCS)