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/nfsd/flexfilelayoutxdr.h | 50 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 fs/nfsd/flexfilelayoutxdr.h (limited to 'fs/nfsd/flexfilelayoutxdr.h') diff --git a/fs/nfsd/flexfilelayoutxdr.h b/fs/nfsd/flexfilelayoutxdr.h new file mode 100644 index 000000000..6d5a1066a --- /dev/null +++ b/fs/nfsd/flexfilelayoutxdr.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2016 Tom Haynes + */ +#ifndef _NFSD_FLEXFILELAYOUTXDR_H +#define _NFSD_FLEXFILELAYOUTXDR_H 1 + +#include +#include "xdr4.h" + +#define FF_FLAGS_NO_LAYOUTCOMMIT 1 +#define FF_FLAGS_NO_IO_THRU_MDS 2 +#define FF_FLAGS_NO_READ_IO 4 + +struct xdr_stream; + +#define FF_NETID_LEN (4) +#define FF_ADDR_LEN (INET6_ADDRSTRLEN + 8) +struct pnfs_ff_netaddr { + char netid[FF_NETID_LEN + 1]; + char addr[FF_ADDR_LEN + 1]; + u32 netid_len; + u32 addr_len; +}; + +struct pnfs_ff_device_addr { + struct pnfs_ff_netaddr netaddr; + u32 version; + u32 minor_version; + u32 rsize; + u32 wsize; + bool tightly_coupled; +}; + +struct pnfs_ff_layout { + u32 flags; + u32 stats_collect_hint; + kuid_t uid; + kgid_t gid; + struct nfsd4_deviceid deviceid; + stateid_t stateid; + struct nfs_fh fh; +}; + +__be32 nfsd4_ff_encode_getdeviceinfo(struct xdr_stream *xdr, + const struct nfsd4_getdeviceinfo *gdp); +__be32 nfsd4_ff_encode_layoutget(struct xdr_stream *xdr, + const struct nfsd4_layoutget *lgp); + +#endif /* _NFSD_FLEXFILELAYOUTXDR_H */ -- cgit v1.3.1