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/collate.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 fs/ntfs/collate.h (limited to 'fs/ntfs/collate.h') diff --git a/fs/ntfs/collate.h b/fs/ntfs/collate.h new file mode 100644 index 000000000..8ad1f04be --- /dev/null +++ b/fs/ntfs/collate.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Defines for NTFS kernel collation handling. + * + * Copyright (c) 2004 Anton Altaparmakov + * + * Part of this file is based on code from the NTFS-3G. + * and is copyrighted by the respective authors below: + * Copyright (c) 2004 Anton Altaparmakov + * Copyright (c) 2005 Yura Pakhuchiy + */ + +#ifndef _LINUX_NTFS_COLLATE_H +#define _LINUX_NTFS_COLLATE_H + +#include "volume.h" + +static inline bool ntfs_is_collation_rule_supported(__le32 cr) +{ + int i; + + if (unlikely(cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG && + cr != COLLATION_FILE_NAME) && cr != COLLATION_NTOFS_ULONGS) + return false; + i = le32_to_cpu(cr); + if (likely(((i >= 0) && (i <= 0x02)) || + ((i >= 0x10) && (i <= 0x13)))) + return true; + return false; +} + +int ntfs_collate(struct ntfs_volume *vol, __le32 cr, + const void *data1, const u32 data1_len, + const void *data2, const u32 data2_len); + +#endif /* _LINUX_NTFS_COLLATE_H */ -- cgit v1.3.1