landlock: Consolidate access-right and scope names in a shared header

Audit formats denial records with per-right name strings.  A following
commit adds trace events that print the same access and scope masks with
__print_flags() and need the same names, but a trace event header cannot
include Landlock-internal headers, so the names cannot be shared from
the logging unit.

Define the filesystem, network, and scope names once, as the
_LANDLOCK_ACCESS_FS_NAMES, _LANDLOCK_ACCESS_NET_NAMES, and
_LANDLOCK_SCOPE_NAMES lists in the public Landlock header.  Each entry
is a _LANDLOCK_NAME_ENTRY() the consumer expands: audit maps it to a
"[bit] = name" array slot for an O(1) lookup, the trace events map it to
a __print_flags() { mask, name } pair.  The bit value comes only from
the LANDLOCK_* UAPI constant each entry references, so every bit-to-name
mapping has a single source and does not depend on entry order.

The shared names are unprefixed; blocker_prefix() prepends the
fs./net./scope. category for audit records, so the scope names move from
inline literals to the shared table too.  Audit records are unchanged.

No functional change.

Cc: Günther Noack <gnoack@google.com>
Cc: Tingmao Wang <m@maowtm.org>
Link: https://patch.msgid.link/20260811094338.288094-7-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/linux/landlock.h b/include/linux/landlock.h
new file mode 100644
index 000000000000..cabe6c784833
--- /dev/null
+++ b/include/linux/landlock.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Landlock - Public types and definitions
+ *
+ * Copyright © 2016-2026 Mickaël Salaün <mic@digikod.net>
+ * Copyright © 2026 Cloudflare, Inc.
+ */
+
+#ifndef _LINUX_LANDLOCK_H
+#define _LINUX_LANDLOCK_H
+
+#include <uapi/linux/landlock.h>
+
+/*
+ * Access-right and scope names, shared between the audit records (get_blocker()
+ * in security/landlock/audit.c) and the trace events
+ * (include/trace/events/landlock.h).  A consumer defines
+ * _LANDLOCK_NAME_ENTRY(mask, name) before expanding a list and undefines it
+ * afterwards: audit maps each entry to a "[bit] = name" slot for O(1) lookup,
+ * the trace events map it to a __print_flags() { mask, name } pair.  The bit
+ * value lives only in the LANDLOCK_* UAPI constant each entry references.
+ * Names are unprefixed; audit prepends the "fs."/"net."/"scope." category.
+ */
+#define _LANDLOCK_ACCESS_FS_NAMES \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_EXECUTE, "execute"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_WRITE_FILE, "write_file"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_READ_FILE, "read_file"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_READ_DIR, "read_dir"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_REMOVE_DIR, "remove_dir"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_REMOVE_FILE, "remove_file"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_CHAR, "make_char"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_DIR, "make_dir"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_REG, "make_reg"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_SOCK, "make_sock"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_FIFO, "make_fifo"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_BLOCK, "make_block"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_MAKE_SYM, "make_sym"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_REFER, "refer"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_TRUNCATE, "truncate"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_IOCTL_DEV, "ioctl_dev"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_FS_RESOLVE_UNIX, "resolve_unix")
+
+#define _LANDLOCK_ACCESS_NET_NAMES \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_NET_BIND_TCP, "bind_tcp"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_NET_CONNECT_TCP, "connect_tcp"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_NET_BIND_UDP, "bind_udp"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_ACCESS_NET_CONNECT_SEND_UDP, \
+			     "connect_send_udp")
+
+#define _LANDLOCK_SCOPE_NAMES \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET, \
+			     "abstract_unix_socket"), \
+	_LANDLOCK_NAME_ENTRY(LANDLOCK_SCOPE_SIGNAL, "signal")
+
+#endif /* _LINUX_LANDLOCK_H */