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/lib/crypto/tests/Makefile b/lib/crypto/tests/Makefile
new file mode 100644
index 000000000..c97c1d787
--- /dev/null
+++ b/lib/crypto/tests/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+obj-$(CONFIG_CRYPTO_LIB_AES_CBC_MACS_KUNIT_TEST) += aes_cbc_macs_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_AES_CCM_KUNIT_TEST) += aes_ccm_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_AES_GCM_KUNIT_TEST) += aes_gcm_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_BLAKE2B_KUNIT_TEST) += blake2b_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_BLAKE2S_KUNIT_TEST) += blake2s_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_CHACHA20POLY1305_KUNIT_TEST) += chacha20poly1305_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_CURVE25519_KUNIT_TEST) += curve25519_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_GHASH_KUNIT_TEST) += ghash_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_MD5_KUNIT_TEST) += md5_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_MLDSA_KUNIT_TEST) += mldsa_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_NH_KUNIT_TEST) += nh_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_POLY1305_KUNIT_TEST) += poly1305_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_POLYVAL_KUNIT_TEST) += polyval_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_SHA1_KUNIT_TEST) += sha1_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_SHA256_KUNIT_TEST) += sha224_kunit.o sha256_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_SHA512_KUNIT_TEST) += sha384_kunit.o sha512_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_SHA3_KUNIT_TEST) += sha3_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_SM3_KUNIT_TEST) += sm3_kunit.o