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_trace.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 fs/xfs/xfs_trace.c (limited to 'fs/xfs/xfs_trace.c') diff --git a/fs/xfs/xfs_trace.c b/fs/xfs/xfs_trace.c new file mode 100644 index 000000000..912713a8a --- /dev/null +++ b/fs/xfs/xfs_trace.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2009, Christoph Hellwig + * All Rights Reserved. + */ +#include "xfs_platform.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_bit.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_group.h" +#include "xfs_defer.h" +#include "xfs_da_format.h" +#include "xfs_inode.h" +#include "xfs_btree.h" +#include "xfs_da_btree.h" +#include "xfs_alloc.h" +#include "xfs_bmap.h" +#include "xfs_attr.h" +#include "xfs_trans.h" +#include "xfs_log.h" +#include "xfs_log_priv.h" +#include "xfs_trans_priv.h" +#include "xfs_buf_item.h" +#include "xfs_quota.h" +#include "xfs_dquot_item.h" +#include "xfs_dquot.h" +#include "xfs_log_recover.h" +#include "xfs_filestream.h" +#include "xfs_fsmap.h" +#include "xfs_btree_staging.h" +#include "xfs_icache.h" +#include "xfs_iunlink_item.h" +#include "xfs_ag.h" +#include "xfs_ag_resv.h" +#include "xfs_error.h" +#include +#include "xfs_iomap.h" +#include "xfs_buf_mem.h" +#include "xfs_btree_mem.h" +#include "xfs_exchmaps.h" +#include "xfs_exchrange.h" +#include "xfs_parent.h" +#include "xfs_rmap.h" +#include "xfs_refcount.h" +#include "xfs_metafile.h" +#include "xfs_metadir.h" +#include "xfs_rtgroup.h" +#include "xfs_zone_alloc.h" +#include "xfs_zone_priv.h" +#include "xfs_health.h" +#include "xfs_healthmon.h" +#include "xfs_notify_failure.h" +#include "xfs_file.h" +#include + +/* + * We include this last to have the helpers above available for the trace + * event implementations. + */ +#define CREATE_TRACE_POINTS +#include "xfs_trace.h" -- cgit v1.3.1