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 --- fs/ocfs2/namei.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 fs/ocfs2/namei.h (limited to 'fs/ocfs2/namei.h') diff --git a/fs/ocfs2/namei.h b/fs/ocfs2/namei.h new file mode 100644 index 000000000..9cc891eb8 --- /dev/null +++ b/fs/ocfs2/namei.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * namei.h + * + * Function prototypes + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + */ + +#ifndef OCFS2_NAMEI_H +#define OCFS2_NAMEI_H + +#define OCFS2_DIO_ORPHAN_PREFIX "dio-" +#define OCFS2_DIO_ORPHAN_PREFIX_LEN 4 + +extern const struct inode_operations ocfs2_dir_iops; + +struct dentry *ocfs2_get_parent(struct dentry *child); + +int ocfs2_orphan_del(struct ocfs2_super *osb, + handle_t *handle, + struct inode *orphan_dir_inode, + struct inode *inode, + struct buffer_head *orphan_dir_bh, + bool dio); +int ocfs2_create_inode_in_orphan(struct inode *dir, + int mode, + struct inode **new_inode); +int ocfs2_add_inode_to_orphan(struct ocfs2_super *osb, + struct inode *inode); +int ocfs2_del_inode_from_orphan(struct ocfs2_super *osb, + struct inode *inode, struct buffer_head *di_bh, + int update_isize, loff_t end); +int ocfs2_mv_orphaned_inode_to_new(struct inode *dir, + struct inode *new_inode, + struct dentry *new_dentry); + +#endif /* OCFS2_NAMEI_H */ -- cgit v1.3.1