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/smb/client/smb2glob.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 fs/smb/client/smb2glob.h (limited to 'fs/smb/client/smb2glob.h') diff --git a/fs/smb/client/smb2glob.h b/fs/smb/client/smb2glob.h new file mode 100644 index 000000000..19da74b1e --- /dev/null +++ b/fs/smb/client/smb2glob.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: LGPL-2.1 */ +/* + * + * Definitions for various global variables and structures + * + * Copyright (C) International Business Machines Corp., 2002, 2011 + * Etersoft, 2012 + * Author(s): Steve French (sfrench@us.ibm.com) + * Jeremy Allison (jra@samba.org) + * Pavel Shilovsky (pshilovsky@samba.org) 2012 + * + */ +#ifndef _SMB2_GLOB_H +#define _SMB2_GLOB_H + +/* + ***************************************************************** + * Constants go here + ***************************************************************** + */ + +/* + * Identifiers for functions that use the open, operation, close pattern + * in smb2inode.c:smb2_compound_op() + */ +enum smb2_compound_ops { + SMB2_OP_SET_DELETE = 1, + SMB2_OP_SET_INFO, + SMB2_OP_QUERY_INFO, + SMB2_OP_QUERY_DIR, + SMB2_OP_MKDIR, + SMB2_OP_RENAME, + SMB2_OP_HARDLINK, + SMB2_OP_SET_EOF, + SMB2_OP_UNLINK, + SMB2_OP_POSIX_QUERY_INFO, + SMB2_OP_SET_REPARSE, + SMB2_OP_GET_REPARSE, + SMB2_OP_QUERY_WSL_EA, + SMB2_OP_OPEN_QUERY, +}; + +/* Used when constructing chained read requests. */ +#define CHAINED_REQUEST 1 +#define START_OF_CHAIN 2 +#define END_OF_CHAIN 4 +#define RELATED_REQUEST 8 + +/* + ***************************************************************** + * Struct definitions go here + ***************************************************************** + */ + +struct status_to_posix_error { + __u32 smb2_status; + int posix_error; + char *status_string; +}; + +#endif /* _SMB2_GLOB_H */ -- cgit v1.3.1