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/ntfs/dir.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 fs/ntfs/dir.h (limited to 'fs/ntfs/dir.h') diff --git a/fs/ntfs/dir.h b/fs/ntfs/dir.h new file mode 100644 index 000000000..a38c6b071 --- /dev/null +++ b/fs/ntfs/dir.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Defines for directory handling in NTFS Linux kernel driver. + * + * Copyright (c) 2002-2004 Anton Altaparmakov + */ + +#ifndef _LINUX_NTFS_DIR_H +#define _LINUX_NTFS_DIR_H + +#include "inode.h" + +/* + * ntfs_name is used to return the file name to the caller of + * ntfs_lookup_inode_by_name() in order for the caller (namei.c::ntfs_lookup()) + * to be able to deal with dcache aliasing issues. + */ +struct ntfs_name { + u64 mref; + u8 type; + u8 len; + __le16 name[]; +} __packed; + +/* The little endian Unicode string $I30 as a global constant. */ +extern __le16 I30[5]; + +u64 ntfs_lookup_inode_by_name(struct ntfs_inode *dir_ni, + const __le16 *uname, const int uname_len, struct ntfs_name **res); +int ntfs_check_empty_dir(struct ntfs_inode *ni, struct mft_record *ni_mrec); + +#endif /* _LINUX_NTFS_FS_DIR_H */ -- cgit v1.3.1