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 --- include/crypto/pcrypt.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 include/crypto/pcrypt.h (limited to 'include/crypto/pcrypt.h') diff --git a/include/crypto/pcrypt.h b/include/crypto/pcrypt.h new file mode 100644 index 000000000..234d7cf3c --- /dev/null +++ b/include/crypto/pcrypt.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * pcrypt - Parallel crypto engine. + * + * Copyright (C) 2009 secunet Security Networks AG + * Copyright (C) 2009 Steffen Klassert + */ + +#ifndef _CRYPTO_PCRYPT_H +#define _CRYPTO_PCRYPT_H + +#include +#include +#include + +struct pcrypt_request { + struct padata_priv padata; + void *data; + void *__ctx[] CRYPTO_MINALIGN_ATTR; +}; + +static inline void *pcrypt_request_ctx(struct pcrypt_request *req) +{ + return req->__ctx; +} + +static inline +struct padata_priv *pcrypt_request_padata(struct pcrypt_request *req) +{ + return &req->padata; +} + +static inline +struct pcrypt_request *pcrypt_padata_request(struct padata_priv *padata) +{ + return container_of(padata, struct pcrypt_request, padata); +} + +#endif -- cgit v1.3.1