Re: [PATCH v1 2/8] LSM: Add an LSM identifier for external use

Add an integer member "id" to the struct lsm_id. This value is
a unique identifier associated with each security module. The
values are defined in a new UAPI header file. Each existing LSM
has been updated to include it's LSMID in the lsm_id.

The LSM ID values are sequential, with the oldest module
LSM_ID_CAPABILITY being the lowest value and the existing
modules numbered in the order they were included in the
main line kernel. The first 32 values (0 - 31) are reserved
for some as yet unknown but important use.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/lsm_hooks.h    |  1 +
 include/uapi/linux/lsm.h     | 32 ++++++++++++++++++++++++++++++++
 security/apparmor/lsm.c      |  2 ++
 security/bpf/hooks.c         |  2 ++
 security/commoncap.c         |  2 ++
 security/landlock/setup.c    |  2 ++
 security/loadpin/loadpin.c   |  2 ++
 security/lockdown/lockdown.c |  2 ++
 security/safesetid/lsm.c     |  2 ++
 security/selinux/hooks.c     |  2 ++
 security/smack/smack_lsm.c   |  2 ++
 security/tomoyo/tomoyo.c     |  2 ++
 security/yama/yama_lsm.c     |  2 ++
 13 files changed, 55 insertions(+)
 create mode 100644 include/uapi/linux/lsm.h

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index e383e468f742..dd4b4d95a172 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h

@@ -1607,6 +1607,7 @@ struct security_hook_heads {
  */
 struct lsm_id {
 	const char	*lsm;		/* Name of the LSM */
+	int		id;		/* LSM ID */

 };
 
 /*

diff --git a/include/uapi/linux/lsm.h b/include/uapi/linux/lsm.h
new file mode 100644
index 000000000000..d5bcbb9375df
--- /dev/null
+++ b/include/uapi/linux/lsm.h

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Linus Security Modules (LSM) - User space API

+ *
+ * Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
+ * Copyright (C) Intel Corporation

+ */
+
+#ifndef _UAPI_LINUX_LSM_H
+#define _UAPI_LINUX_LSM_H
+
+/*
+ * ID values to identify security modules.
+ * A system may use more than one security module.
+ *
+ * LSM_ID_XXX values 0 - 31 are reserved for future use