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/nfs/netns.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 fs/nfs/netns.h (limited to 'fs/nfs/netns.h') diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h new file mode 100644 index 000000000..366585791 --- /dev/null +++ b/fs/nfs/netns.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * NFS-private data for each "struct net". Accessed with net_generic(). + */ + +#ifndef __NFS_NETNS_H__ +#define __NFS_NETNS_H__ + +#include +#include +#include +#include + +struct bl_dev_msg { + int32_t status; + uint32_t major, minor; +}; + +struct nfs_netns_client; + +struct nfs_net { + struct cache_detail *nfs_dns_resolve; + struct rpc_pipe *bl_device_pipe; + struct bl_dev_msg bl_mount_reply; + wait_queue_head_t bl_wq; + struct mutex bl_mutex; + struct list_head nfs_client_list; + struct list_head nfs_volume_list; +#if IS_ENABLED(CONFIG_NFS_V4) + struct idr cb_ident_idr; /* Protected by nfs_client_lock */ + unsigned short nfs_callback_tcpport; + unsigned short nfs_callback_tcpport6; + int cb_users[NFS4_MAX_MINOR_VERSION + 1]; + struct list_head nfs4_data_server_cache; + spinlock_t nfs4_data_server_lock; +#endif /* CONFIG_NFS_V4 */ + struct nfs_netns_client *nfs_client; + spinlock_t nfs_client_lock; + ktime_t boot_time; + struct rpc_stat rpcstats; +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *proc_nfsfs; +#endif +}; + +extern unsigned int nfs_net_id; + +#endif -- cgit v1.3.1