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, 30 insertions, 0 deletions

diff --git a/crypto/ripemd.h b/crypto/ripemd.h
new file mode 100644
index 000000000..b977785e2
--- /dev/null
+++ b/crypto/ripemd.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common values for RIPEMD algorithms
+ */
+
+#ifndef _CRYPTO_RMD_H
+#define _CRYPTO_RMD_H
+
+#define RMD160_DIGEST_SIZE      20
+#define RMD160_BLOCK_SIZE       64
+
+/* initial values  */
+#define RMD_H0  0x67452301UL
+#define RMD_H1  0xefcdab89UL
+#define RMD_H2  0x98badcfeUL
+#define RMD_H3  0x10325476UL
+#define RMD_H4  0xc3d2e1f0UL
+
+/* constants */
+#define RMD_K1  0x00000000UL
+#define RMD_K2  0x5a827999UL
+#define RMD_K3  0x6ed9eba1UL
+#define RMD_K4  0x8f1bbcdcUL
+#define RMD_K5  0xa953fd4eUL
+#define RMD_K6  0x50a28be6UL
+#define RMD_K7  0x5c4dd124UL
+#define RMD_K8  0x6d703ef3UL
+#define RMD_K9  0x7a6d76e9UL
+
+#endif