Re: [PATCH v3 1/9] LSM: Identify modules by more than name

["Mickaël Salaün" <mic@digikod.net>]

On 23/11/2022 21:15, Casey Schaufler wrote:
> Create a struct lsm_id to contain identifying information
> about Linux Security Modules (LSMs). At inception this contains
> the name of the module and an identifier associated with the
> security module. Change the security_add_hooks() interface to
> use this structure. Change the individual modules to maintain
> their own struct lsm_id and pass it to security_add_hooks().
> 
> The values are for LSM identifiers are defined in a new UAPI
> header file linux/lsm.h. 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.
> This is an arbitrary convention for assigning the values, but
> none better presents itself. The value 0 is defined as being invalid.
> The values 1-99 are reserved for any special case uses which may
> arise in the future.
> 
> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
> ---
>   include/linux/lsm_hooks.h    | 16 ++++++++++++++--
>   include/uapi/linux/lsm.h     | 32 ++++++++++++++++++++++++++++++++
>   security/apparmor/lsm.c      |  8 +++++++-
>   security/bpf/hooks.c         | 13 ++++++++++++-
>   security/commoncap.c         |  8 +++++++-
>   security/landlock/cred.c     |  2 +-
>   security/landlock/fs.c       |  2 +-
>   security/landlock/ptrace.c   |  2 +-
>   security/landlock/setup.c    |  6 ++++++
>   security/landlock/setup.h    |  1 +
>   security/loadpin/loadpin.c   |  9 ++++++++-
>   security/lockdown/lockdown.c |  8 +++++++-
>   security/safesetid/lsm.c     |  9 ++++++++-
>   security/security.c          | 12 ++++++------
>   security/selinux/hooks.c     |  9 ++++++++-
>   security/smack/smack_lsm.c   |  8 +++++++-
>   security/tomoyo/tomoyo.c     |  9 ++++++++-
>   security/yama/yama_lsm.c     |  8 +++++++-
>   18 files changed, 141 insertions(+), 21 deletions(-)
>   create mode 100644 include/uapi/linux/lsm.h
> 
> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index 4ec80b96c22e..d306db1044d1 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -1602,6 +1602,18 @@ struct security_hook_heads {
>   	#undef LSM_HOOK
>   } __randomize_layout;
>   
> +/**
> + * struct lsm_id - identify a Linux Security Module.
> + * @lsm: Name of the LSM. Must be approved by the LSM maintainers.
> + * @id: LSM ID number from uapi/linux/lsm.h
> + *
> + * Contains the information that identifies the LSM.
> + */
> +struct lsm_id {
> +	const u8	*lsm;
> +	u32		id;
> +};
> +
>   /*
>    * Security module hook list structure.
>    * For use with generic list macros for common operations.
> @@ -1610,7 +1622,7 @@ struct security_hook_list {
>   	struct hlist_node		list;
>   	struct hlist_head		*head;
>   	union security_list_options	hook;
> -	const char			*lsm;
> +	struct lsm_id			*lsmid;
>   } __randomize_layout;
>   
>   /*
> @@ -1645,7 +1657,7 @@ extern struct security_hook_heads security_hook_heads;
>   extern char *lsm_names;
>   
>   extern void security_add_hooks(struct security_hook_list *hooks, int count,
> -				const char *lsm);
> +			       struct lsm_id *lsmid);
>   
>   #define LSM_FLAG_LEGACY_MAJOR	BIT(0)
>   #define LSM_FLAG_EXCLUSIVE	BIT(1)
> diff --git a/include/uapi/linux/lsm.h b/include/uapi/linux/lsm.h
> new file mode 100644
> index 000000000000..47791c330cbf
> --- /dev/null
> +++ b/include/uapi/linux/lsm.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Linux Security Modules (LSM) - User space API
> + *
> + * Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
> + * Copyright (C) 2022 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.
> + *
> + * Values 1-99 are reserved for future use in special cases.

This line should be removed unless justified. What could be special 
about IDs? The syscalls already have a "flags" argument, which is enough.

> + */
> +#define LSM_ID_INVALID		0

Reserving 0 is good, but it doesn't deserve a dedicated declaration. 
LSM_ID_INVALID should be removed.


> +#define LSM_ID_CAPABILITY	100

This should be 1…

> +#define LSM_ID_SELINUX		101
> +#define LSM_ID_SMACK		102
> +#define LSM_ID_TOMOYO		103
> +#define LSM_ID_IMA		104
> +#define LSM_ID_APPARMOR		105
> +#define LSM_ID_YAMA		106
> +#define LSM_ID_LOADPIN		107
> +#define LSM_ID_SAFESETID	108
> +#define LSM_ID_LOCKDOWN		109
> +#define LSM_ID_BPF		110
> +#define LSM_ID_LANDLOCK		111
> +
> +#endif /* _UAPI_LINUX_LSM_H */
> diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
> index f56070270c69..b859b1af6c75 100644
> --- a/security/apparmor/lsm.c
> +++ b/security/apparmor/lsm.c
> @@ -24,6 +24,7 @@
>   #include <linux/zlib.h>
>   #include <net/sock.h>
>   #include <uapi/linux/mount.h>
> +#include <uapi/linux/lsm.h>
>   
>   #include "include/apparmor.h"
>   #include "include/apparmorfs.h"
> @@ -1202,6 +1203,11 @@ struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
>   	.lbs_task = sizeof(struct aa_task_ctx),
>   };
>   
> +static struct lsm_id apparmor_lsmid __lsm_ro_after_init = {
> +	.lsm = "apparmor",
> +	.id = LSM_ID_APPARMOR,
> +};
> +
>   static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
>   	LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
> @@ -1897,7 +1903,7 @@ static int __init apparmor_init(void)
>   		goto buffers_out;
>   	}
>   	security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
> -				"apparmor");
> +				&apparmor_lsmid);
>   
>   	/* Report that AppArmor successfully initialized */
>   	apparmor_initialized = 1;
> diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c
> index e5971fa74fd7..20983ae8d31f 100644
> --- a/security/bpf/hooks.c
> +++ b/security/bpf/hooks.c
> @@ -5,6 +5,7 @@
>    */
>   #include <linux/lsm_hooks.h>
>   #include <linux/bpf_lsm.h>
> +#include <uapi/linux/lsm.h>
>   
>   static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
>   	#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
> @@ -15,9 +16,19 @@ static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(task_free, bpf_task_storage_free),
>   };
>   
> +/*
> + * slot has to be LSMBLOB_NEEDED because some of the hooks
> + * supplied by this module require a slot.
> + */
> +struct lsm_id bpf_lsmid __lsm_ro_after_init = {
> +	.lsm = "bpf",
> +	.id = LSM_ID_BPF,
> +};
> +
>   static int __init bpf_lsm_init(void)
>   {
> -	security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), "bpf");
> +	security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks),
> +			   &bpf_lsmid);
>   	pr_info("LSM support for eBPF active\n");
>   	return 0;
>   }
> diff --git a/security/commoncap.c b/security/commoncap.c
> index bc751fa5adad..f6d50b69f43d 100644
> --- a/security/commoncap.c
> +++ b/security/commoncap.c
> @@ -25,6 +25,7 @@
>   #include <linux/binfmts.h>
>   #include <linux/personality.h>
>   #include <linux/mnt_idmapping.h>
> +#include <uapi/linux/lsm.h>
>   
>   /*
>    * If a non-root user executes a setuid-root binary in
> @@ -1448,6 +1449,11 @@ int cap_mmap_file(struct file *file, unsigned long reqprot,
>   
>   #ifdef CONFIG_SECURITY
>   
> +static struct lsm_id capability_lsmid __lsm_ro_after_init = {
> +	.lsm = "capability",
> +	.id = LSM_ID_CAPABILITY,
> +};
> +
>   static struct security_hook_list capability_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(capable, cap_capable),
>   	LSM_HOOK_INIT(settime, cap_settime),
> @@ -1472,7 +1478,7 @@ static struct security_hook_list capability_hooks[] __lsm_ro_after_init = {
>   static int __init capability_init(void)
>   {
>   	security_add_hooks(capability_hooks, ARRAY_SIZE(capability_hooks),
> -				"capability");
> +			   &capability_lsmid);
>   	return 0;
>   }
>   
> diff --git a/security/landlock/cred.c b/security/landlock/cred.c
> index ec6c37f04a19..2eb1d65f10d6 100644
> --- a/security/landlock/cred.c
> +++ b/security/landlock/cred.c
> @@ -42,5 +42,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
>   __init void landlock_add_cred_hooks(void)
>   {
>   	security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
> -			   LANDLOCK_NAME);
> +			   &landlock_lsmid);
>   }
> diff --git a/security/landlock/fs.c b/security/landlock/fs.c
> index 64ed7665455f..486ff50d54a1 100644
> --- a/security/landlock/fs.c
> +++ b/security/landlock/fs.c
> @@ -1201,5 +1201,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
>   __init void landlock_add_fs_hooks(void)
>   {
>   	security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
> -			   LANDLOCK_NAME);
> +			   &landlock_lsmid);
>   }
> diff --git a/security/landlock/ptrace.c b/security/landlock/ptrace.c
> index 4c5b9cd71286..eab35808f395 100644
> --- a/security/landlock/ptrace.c
> +++ b/security/landlock/ptrace.c
> @@ -116,5 +116,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
>   __init void landlock_add_ptrace_hooks(void)
>   {
>   	security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
> -			   LANDLOCK_NAME);
> +			   &landlock_lsmid);
>   }
> diff --git a/security/landlock/setup.c b/security/landlock/setup.c
> index f8e8e980454c..5b32c087e34b 100644
> --- a/security/landlock/setup.c
> +++ b/security/landlock/setup.c
> @@ -8,6 +8,7 @@
>   
>   #include <linux/init.h>
>   #include <linux/lsm_hooks.h>
> +#include <uapi/linux/lsm.h>
>   
>   #include "common.h"
>   #include "cred.h"
> @@ -23,6 +24,11 @@ struct lsm_blob_sizes landlock_blob_sizes __lsm_ro_after_init = {
>   	.lbs_superblock = sizeof(struct landlock_superblock_security),
>   };
>   
> +struct lsm_id landlock_lsmid __lsm_ro_after_init = {
> +	.lsm = LANDLOCK_NAME,
> +	.id = LSM_ID_LANDLOCK,
> +};
> +
>   static int __init landlock_init(void)
>   {
>   	landlock_add_cred_hooks();
> diff --git a/security/landlock/setup.h b/security/landlock/setup.h
> index 1daffab1ab4b..38bce5b172dc 100644
> --- a/security/landlock/setup.h
> +++ b/security/landlock/setup.h
> @@ -14,5 +14,6 @@
>   extern bool landlock_initialized;
>   
>   extern struct lsm_blob_sizes landlock_blob_sizes;
> +extern struct lsm_id landlock_lsmid;
>   
>   #endif /* _SECURITY_LANDLOCK_SETUP_H */
> diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
> index de41621f4998..32bdf7294a6f 100644
> --- a/security/loadpin/loadpin.c
> +++ b/security/loadpin/loadpin.c
> @@ -20,6 +20,7 @@
>   #include <linux/string_helpers.h>
>   #include <linux/dm-verity-loadpin.h>
>   #include <uapi/linux/loadpin.h>
> +#include <uapi/linux/lsm.h>
>   
>   #define VERITY_DIGEST_FILE_HEADER "# LOADPIN_TRUSTED_VERITY_ROOT_DIGESTS"
>   
> @@ -197,6 +198,11 @@ static int loadpin_load_data(enum kernel_load_data_id id, bool contents)
>   	return loadpin_read_file(NULL, (enum kernel_read_file_id) id, contents);
>   }
>   
> +static struct lsm_id loadpin_lsmid __lsm_ro_after_init = {
> +	.lsm = "loadpin",
> +	.id = LSM_ID_LOADPIN,
> +};
> +
>   static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(sb_free_security, loadpin_sb_free_security),
>   	LSM_HOOK_INIT(kernel_read_file, loadpin_read_file),
> @@ -244,7 +250,8 @@ static int __init loadpin_init(void)
>   	pr_info("ready to pin (currently %senforcing)\n",
>   		enforce ? "" : "not ");
>   	parse_exclude();
> -	security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin");
> +	security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks),
> +			   &loadpin_lsmid);
>   
>   	return 0;
>   }
> diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
> index a79b985e917e..e8c41a0caf7d 100644
> --- a/security/lockdown/lockdown.c
> +++ b/security/lockdown/lockdown.c
> @@ -13,6 +13,7 @@
>   #include <linux/security.h>
>   #include <linux/export.h>
>   #include <linux/lsm_hooks.h>
> +#include <uapi/linux/lsm.h>
>   
>   static enum lockdown_reason kernel_locked_down;
>   
> @@ -75,6 +76,11 @@ static struct security_hook_list lockdown_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(locked_down, lockdown_is_locked_down),
>   };
>   
> +static struct lsm_id lockdown_lsmid __lsm_ro_after_init = {
> +	.lsm = "lockdown",
> +	.id = LSM_ID_LOCKDOWN,
> +};
> +
>   static int __init lockdown_lsm_init(void)
>   {
>   #if defined(CONFIG_LOCK_DOWN_KERNEL_FORCE_INTEGRITY)
> @@ -83,7 +89,7 @@ static int __init lockdown_lsm_init(void)
>   	lock_kernel_down("Kernel configuration", LOCKDOWN_CONFIDENTIALITY_MAX);
>   #endif
>   	security_add_hooks(lockdown_hooks, ARRAY_SIZE(lockdown_hooks),
> -			   "lockdown");
> +			   &lockdown_lsmid);
>   	return 0;
>   }
>   
> diff --git a/security/safesetid/lsm.c b/security/safesetid/lsm.c
> index e806739f7868..8d0742ba045d 100644
> --- a/security/safesetid/lsm.c
> +++ b/security/safesetid/lsm.c
> @@ -19,6 +19,7 @@
>   #include <linux/ptrace.h>
>   #include <linux/sched/task_stack.h>
>   #include <linux/security.h>
> +#include <uapi/linux/lsm.h>
>   #include "lsm.h"
>   
>   /* Flag indicating whether initialization completed */
> @@ -261,6 +262,11 @@ static int safesetid_task_fix_setgroups(struct cred *new, const struct cred *old
>   	return 0;
>   }
>   
> +static struct lsm_id safesetid_lsmid __lsm_ro_after_init = {
> +	.lsm = "safesetid",
> +	.id = LSM_ID_SAFESETID,
> +};
> +
>   static struct security_hook_list safesetid_security_hooks[] = {
>   	LSM_HOOK_INIT(task_fix_setuid, safesetid_task_fix_setuid),
>   	LSM_HOOK_INIT(task_fix_setgid, safesetid_task_fix_setgid),
> @@ -271,7 +277,8 @@ static struct security_hook_list safesetid_security_hooks[] = {
>   static int __init safesetid_security_init(void)
>   {
>   	security_add_hooks(safesetid_security_hooks,
> -			   ARRAY_SIZE(safesetid_security_hooks), "safesetid");
> +			   ARRAY_SIZE(safesetid_security_hooks),
> +			   &safesetid_lsmid);
>   
>   	/* Report that SafeSetID successfully initialized */
>   	safesetid_initialized = 1;
> diff --git a/security/security.c b/security/security.c
> index 79d82cb6e469..b2eb0ccd954b 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -476,17 +476,17 @@ static int lsm_append(const char *new, char **result)
>    * security_add_hooks - Add a modules hooks to the hook lists.
>    * @hooks: the hooks to add
>    * @count: the number of hooks to add
> - * @lsm: the name of the security module
> + * @lsmid: the identification information for the security module
>    *
>    * Each LSM has to register its hooks with the infrastructure.
>    */
>   void __init security_add_hooks(struct security_hook_list *hooks, int count,
> -				const char *lsm)
> +			       struct lsm_id *lsmid)
>   {
>   	int i;
>   
>   	for (i = 0; i < count; i++) {
> -		hooks[i].lsm = lsm;
> +		hooks[i].lsmid = lsmid;
>   		hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
>   	}
>   
> @@ -495,7 +495,7 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
>   	 * and fix this up afterwards.
>   	 */
>   	if (slab_is_available()) {
> -		if (lsm_append(lsm, &lsm_names) < 0)
> +		if (lsm_append(lsmid->lsm, &lsm_names) < 0)
>   			panic("%s - Cannot get early memory.\n", __func__);
>   	}
>   }
> @@ -2070,7 +2070,7 @@ int security_getprocattr(struct task_struct *p, const char *lsm,
>   	struct security_hook_list *hp;
>   
>   	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
> -		if (lsm != NULL && strcmp(lsm, hp->lsm))
> +		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
>   			continue;
>   		return hp->hook.getprocattr(p, name, value);
>   	}
> @@ -2083,7 +2083,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value,
>   	struct security_hook_list *hp;
>   
>   	hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
> -		if (lsm != NULL && strcmp(lsm, hp->lsm))
> +		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
>   			continue;
>   		return hp->hook.setprocattr(name, value, size);
>   	}
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index f553c370397e..5fcce36267bd 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -92,6 +92,7 @@
>   #include <linux/fsnotify.h>
>   #include <linux/fanotify.h>
>   #include <linux/io_uring.h>
> +#include <uapi/linux/lsm.h>
>   
>   #include "avc.h"
>   #include "objsec.h"
> @@ -7014,6 +7015,11 @@ static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
>   }
>   #endif /* CONFIG_IO_URING */
>   
> +static struct lsm_id selinux_lsmid __lsm_ro_after_init = {
> +	.lsm = "selinux",
> +	.id = LSM_ID_SELINUX,
> +};
> +
>   /*
>    * IMPORTANT NOTE: When adding new hooks, please be careful to keep this order:
>    * 1. any hooks that don't belong to (2.) or (3.) below,
> @@ -7334,7 +7340,8 @@ static __init int selinux_init(void)
>   
>   	hashtab_cache_init();
>   
> -	security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks), "selinux");
> +	security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks),
> +			   &selinux_lsmid);
>   
>   	if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
>   		panic("SELinux: Unable to register AVC netcache callback\n");
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index b6306d71c908..c7ba80e20b8d 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -43,6 +43,7 @@
>   #include <linux/fs_parser.h>
>   #include <linux/watch_queue.h>
>   #include <linux/io_uring.h>
> +#include <uapi/linux/lsm.h>
>   #include "smack.h"
>   
>   #define TRANS_TRUE	"TRUE"
> @@ -4787,6 +4788,11 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
>   	.lbs_superblock = sizeof(struct superblock_smack),
>   };
>   
> +static struct lsm_id smack_lsmid __lsm_ro_after_init = {
> +	.lsm = "smack",
> +	.id = LSM_ID_SMACK,
> +};
> +
>   static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
>   	LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
> @@ -4990,7 +4996,7 @@ static __init int smack_init(void)
>   	/*
>   	 * Register with LSM
>   	 */
> -	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
> +	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), &smack_lsmid);
>   	smack_enabled = 1;
>   
>   	pr_info("Smack:  Initializing.\n");
> diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
> index 71e82d855ebf..1916eb6216f7 100644
> --- a/security/tomoyo/tomoyo.c
> +++ b/security/tomoyo/tomoyo.c
> @@ -6,6 +6,7 @@
>    */
>   
>   #include <linux/lsm_hooks.h>
> +#include <uapi/linux/lsm.h>
>   #include "common.h"
>   
>   /**
> @@ -530,6 +531,11 @@ static void tomoyo_task_free(struct task_struct *task)
>   	}
>   }
>   
> +static struct lsm_id tomoyo_lsmid __lsm_ro_after_init = {
> +	.lsm = "tomoyo",
> +	.id = LSM_ID_TOMOYO,
> +};
> +
>   /*
>    * tomoyo_security_ops is a "struct security_operations" which is used for
>    * registering TOMOYO.
> @@ -582,7 +588,8 @@ static int __init tomoyo_init(void)
>   	struct tomoyo_task *s = tomoyo_task(current);
>   
>   	/* register ourselves with the security framework */
> -	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
> +	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks),
> +			   &tomoyo_lsmid);
>   	pr_info("TOMOYO Linux initialized\n");
>   	s->domain_info = &tomoyo_kernel_domain;
>   	atomic_inc(&tomoyo_kernel_domain.users);
> diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
> index 06e226166aab..2487b8f847f3 100644
> --- a/security/yama/yama_lsm.c
> +++ b/security/yama/yama_lsm.c
> @@ -18,6 +18,7 @@
>   #include <linux/task_work.h>
>   #include <linux/sched.h>
>   #include <linux/spinlock.h>
> +#include <uapi/linux/lsm.h>
>   
>   #define YAMA_SCOPE_DISABLED	0
>   #define YAMA_SCOPE_RELATIONAL	1
> @@ -421,6 +422,11 @@ static int yama_ptrace_traceme(struct task_struct *parent)
>   	return rc;
>   }
>   
> +static struct lsm_id yama_lsmid __lsm_ro_after_init = {
> +	.lsm = "yama",
> +	.id = LSM_ID_YAMA,
> +};
> +
>   static struct security_hook_list yama_hooks[] __lsm_ro_after_init = {
>   	LSM_HOOK_INIT(ptrace_access_check, yama_ptrace_access_check),
>   	LSM_HOOK_INIT(ptrace_traceme, yama_ptrace_traceme),
> @@ -477,7 +483,7 @@ static inline void yama_init_sysctl(void) { }
>   static int __init yama_init(void)
>   {
>   	pr_info("Yama: becoming mindful.\n");
> -	security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), "yama");
> +	security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), &yama_lsmid);
>   	yama_init_sysctl();
>   	return 0;
>   }

The rest looks good to me.