From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock 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 Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- lib/kunit/Makefile | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 lib/kunit/Makefile (limited to 'lib/kunit/Makefile') diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile new file mode 100644 index 000000000..204e02b10 --- /dev/null +++ b/lib/kunit/Makefile @@ -0,0 +1,34 @@ +obj-$(CONFIG_KUNIT) += kunit.o + +kunit-objs += test.o \ + resource.o \ + user_alloc.o \ + static_stub.o \ + string-stream.o \ + assert.o \ + try-catch.o \ + executor.o \ + attributes.o \ + device.o \ + platform.o \ + fwnode.o \ + bug.o + +ifeq ($(CONFIG_KUNIT_DEBUGFS),y) +kunit-objs += debugfs.o +endif + +# KUnit 'hooks' are built-in even when KUnit is built as a module. +obj-$(if $(CONFIG_KUNIT),y) += hooks.o + +obj-$(CONFIG_KUNIT_TEST) += kunit-test.o +obj-$(CONFIG_KUNIT_TEST) += platform-test.o +obj-$(CONFIG_KUNIT_TEST) += backtrace-suppression-test.o + +# string-stream-test compiles built-in only. +ifeq ($(CONFIG_KUNIT_TEST),y) +obj-$(CONFIG_KUNIT_TEST) += string-stream-test.o +obj-$(CONFIG_KUNIT_TEST) += assert_test.o +endif + +obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += kunit-example-test.o -- cgit v1.3.1