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, 152 insertions, 0 deletions

diff --git a/include/uapi/rdma/ocrdma-abi.h b/include/uapi/rdma/ocrdma-abi.h
new file mode 100644
index 000000000..284d47b41
--- /dev/null
+++ b/include/uapi/rdma/ocrdma-abi.h
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
+/* This file is part of the Emulex RoCE Device Driver for
+ * RoCE (RDMA over Converged Ethernet) adapters.
+ * Copyright (C) 2012-2015 Emulex. All rights reserved.
+ * EMULEX and SLI are trademarks of Emulex.
+ * www.emulex.com
+ *
+ * This software is available to you under a choice of one of two licenses.
+ * You may choose to be licensed under the terms of the GNU General Public
+ * License (GPL) Version 2, available from the file COPYING in the main
+ * directory of this source tree, or the BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Contact Information:
+ * linux-drivers@emulex.com
+ *
+ * Emulex
+ * 3333 Susan Street
+ * Costa Mesa, CA 92626
+ */
+
+#ifndef OCRDMA_ABI_USER_H
+#define OCRDMA_ABI_USER_H
+
+#include <linux/types.h>
+
+#define OCRDMA_ABI_VERSION 2
+#define OCRDMA_BE_ROCE_ABI_VERSION 1
+/* user kernel communication data structures. */
+
+struct ocrdma_alloc_ucontext_resp {
+	__u32 dev_id;
+	__u32 wqe_size;
+	__u32 max_inline_data;
+	__u32 dpp_wqe_size;
+	__aligned_u64 ah_tbl_page;
+	__u32 ah_tbl_len;
+	__u32 rqe_size;
+	__u8 fw_ver[32];
+	/* for future use/new features in progress */
+	__aligned_u64 rsvd1;
+	__aligned_u64 rsvd2;
+};
+
+struct ocrdma_alloc_pd_ureq {
+	__u32 rsvd[2];
+};
+
+struct ocrdma_alloc_pd_uresp {
+	__u32 id;
+	__u32 dpp_enabled;
+	__u32 dpp_page_addr_hi;
+	__u32 dpp_page_addr_lo;
+	__u32 rsvd[2];
+};
+
+struct ocrdma_create_cq_ureq {
+	__u32 dpp_cq;
+	__u32 rsvd; /* pad */
+};
+
+#define MAX_CQ_PAGES 8
+struct ocrdma_create_cq_uresp {
+	__u32 cq_id;
+	__u32 page_size;
+	__u32 num_pages;
+	__u32 max_hw_cqe;
+	__aligned_u64 page_addr[MAX_CQ_PAGES];
+	__aligned_u64 db_page_addr;
+	__u32 db_page_size;
+	__u32 phase_change;
+	/* for future use/new features in progress */
+	__aligned_u64 rsvd1;
+	__aligned_u64 rsvd2;
+};
+
+#define MAX_QP_PAGES 8
+#define MAX_UD_AV_PAGES 8
+
+struct ocrdma_create_qp_ureq {
+	__u8 enable_dpp_cq;
+	__u8 rsvd;
+	__u16 dpp_cq_id;
+	__u32 rsvd1;	/* pad */
+};
+
+struct ocrdma_create_qp_uresp {
+	__u16 qp_id;
+	__u16 sq_dbid;
+	__u16 rq_dbid;
+	__u16 resv0;	/* pad */
+	__u32 sq_page_size;
+	__u32 rq_page_size;
+	__u32 num_sq_pages;
+	__u32 num_rq_pages;
+	__aligned_u64 sq_page_addr[MAX_QP_PAGES];
+	__aligned_u64 rq_page_addr[MAX_QP_PAGES];
+	__aligned_u64 db_page_addr;
+	__u32 db_page_size;
+	__u32 dpp_credit;
+	__u32 dpp_offset;
+	__u32 num_wqe_allocated;
+	__u32 num_rqe_allocated;
+	__u32 db_sq_offset;
+	__u32 db_rq_offset;
+	__u32 db_shift;
+	__aligned_u64 rsvd[11];
+};
+
+struct ocrdma_create_srq_uresp {
+	__u16 rq_dbid;
+	__u16 resv0;	/* pad */
+	__u32 resv1;
+
+	__u32 rq_page_size;
+	__u32 num_rq_pages;
+
+	__aligned_u64 rq_page_addr[MAX_QP_PAGES];
+	__aligned_u64 db_page_addr;
+
+	__u32 db_page_size;
+	__u32 num_rqe_allocated;
+	__u32 db_rq_offset;
+	__u32 db_shift;
+
+	__aligned_u64 rsvd2;
+	__aligned_u64 rsvd3;
+};
+
+#endif	/* OCRDMA_ABI_USER_H */