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/nilfs2/ifile.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 fs/nilfs2/ifile.h (limited to 'fs/nilfs2/ifile.h') diff --git a/fs/nilfs2/ifile.h b/fs/nilfs2/ifile.h new file mode 100644 index 000000000..d38a46f5a --- /dev/null +++ b/fs/nilfs2/ifile.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * NILFS inode file + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * Written by Amagai Yoshiji. + * Revised by Ryusuke Konishi. + * + */ + +#ifndef _NILFS_IFILE_H +#define _NILFS_IFILE_H + +#include +#include +#include "mdt.h" +#include "alloc.h" + + +static inline struct nilfs_inode * +nilfs_ifile_map_inode(struct inode *ifile, u64 ino, struct buffer_head *ibh) +{ + size_t __offset_in_folio = nilfs_palloc_entry_offset(ifile, ino, ibh); + + return kmap_local_folio(ibh->b_folio, __offset_in_folio); +} + +static inline void nilfs_ifile_unmap_inode(struct nilfs_inode *raw_inode) +{ + kunmap_local(raw_inode); +} + +int nilfs_ifile_create_inode(struct inode *ifile, u64 *out_ino, + struct buffer_head **out_bh); +int nilfs_ifile_delete_inode(struct inode *ifile, u64 ino); +int nilfs_ifile_get_inode_block(struct inode *ifile, u64 ino, + struct buffer_head **out_bh); + +int nilfs_ifile_count_free_inodes(struct inode *, u64 *, u64 *); + +int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root, + __u64 cno, size_t inode_size); + +#endif /* _NILFS_IFILE_H */ -- cgit v1.3.1