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/xfs/xfs_ioctl.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 fs/xfs/xfs_ioctl.h (limited to 'fs/xfs/xfs_ioctl.h') diff --git a/fs/xfs/xfs_ioctl.h b/fs/xfs/xfs_ioctl.h new file mode 100644 index 000000000..f5ed5cf9d --- /dev/null +++ b/fs/xfs/xfs_ioctl.h @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2008 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#ifndef __XFS_IOCTL_H__ +#define __XFS_IOCTL_H__ + +struct xfs_bstat; +struct xfs_ibulk; +struct xfs_inogrp; + +int +xfs_ioc_swapext( + xfs_swapext_t *sxp); + +extern int +xfs_fileattr_get( + struct dentry *dentry, + struct file_kattr *fa); + +extern int +xfs_fileattr_set( + struct mnt_idmap *idmap, + struct dentry *dentry, + struct file_kattr *fa); + +extern long +xfs_file_ioctl( + struct file *filp, + unsigned int cmd, + unsigned long p); + +extern long +xfs_file_compat_ioctl( + struct file *file, + unsigned int cmd, + unsigned long arg); + +int xfs_fsbulkstat_one_fmt(struct xfs_ibulk *breq, + const struct xfs_bulkstat *bstat); +int xfs_fsinumbers_fmt(struct xfs_ibulk *breq, const struct xfs_inumbers *igrp); + +#endif -- cgit v1.3.1