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Message-ID: <d98589cf-1fe2-d3e8-7d89-6959613b4518@digikod.net>
Date:   Tue, 11 Jul 2023 17:35:34 +0200
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Subject: Re: [PATCH v12 01/11] LSM: Identify modules by more than name
Content-Language: en-US
To:     Casey Schaufler <casey@schaufler-ca.com>, paul@paul-moore.com,
        linux-security-module@vger.kernel.org
Cc:     jmorris@namei.org, serge@hallyn.com, keescook@chromium.org,
        john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
        stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org,
        linux-api@vger.kernel.org
References: <20230629195535.2590-1-casey@schaufler-ca.com>
 <20230629195535.2590-2-casey@schaufler-ca.com>
From:   =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@digikod.net>
In-Reply-To: <20230629195535.2590-2-casey@schaufler-ca.com>
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On 29/06/2023 21:55, 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, an identifier associated with the security
> module and an integer member "attrs" which identifies the API
> related data associated with each security module. The initial set
> of features maps to information that has traditionaly been available
> in /proc/self/attr. They are documented in a new userspace-api file.
> 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. This may include attributes of the LSM
> infrastructure itself, possibly related to namespacing or network
> attribute management. A special range is identified for such attributes
> to help reduce confusion for developers unfamiliar with LSMs.
> 
> LSM attribute values are defined for the attributes presented by
> modules that are available today. As with the LSM IDs, 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>
> Cc: linux-security-module <linux-security-module@vger.kernel.org>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Reviewed-by: Serge Hallyn <serge@hallyn.com>

With the constification:

Reviewed-by: Mickaël Salaün <mic@digikod.net>

> ---
>   Documentation/userspace-api/index.rst |  1 +
>   Documentation/userspace-api/lsm.rst   | 55 +++++++++++++++++++++++++++
>   MAINTAINERS                           |  1 +
>   include/linux/lsm_hooks.h             | 16 +++++++-
>   include/uapi/linux/lsm.h              | 54 ++++++++++++++++++++++++++
>   security/apparmor/lsm.c               |  8 +++-
>   security/bpf/hooks.c                  |  9 ++++-
>   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 +++-
>   21 files changed, 216 insertions(+), 21 deletions(-)
>   create mode 100644 Documentation/userspace-api/lsm.rst
>   create mode 100644 include/uapi/linux/lsm.h
> 
> diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst
> index 72a65db0c498..b5fa29c077eb 100644
> --- a/Documentation/userspace-api/index.rst
> +++ b/Documentation/userspace-api/index.rst
> @@ -32,6 +32,7 @@ place where this information is gathered.
>      sysfs-platform_profile
>      vduse
>      futex2
> +   lsm
>   
>   .. only::  subproject and html
>   
> diff --git a/Documentation/userspace-api/lsm.rst b/Documentation/userspace-api/lsm.rst
> new file mode 100644
> index 000000000000..6ddf5506110b
> --- /dev/null
> +++ b/Documentation/userspace-api/lsm.rst
> @@ -0,0 +1,55 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +.. Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com>
> +.. Copyright (C) 2022 Intel Corporation
> +
> +=====================================
> +Linux Security Modules
> +=====================================
> +
> +:Author: Casey Schaufler
> +:Date: November 2022

You might want to update this date.

> +
> +Linux security modules (LSM) provide a mechanism to implement
> +additional access controls to the Linux security policies.
> +
> +The various security modules may support any of these attributes:
> +
> +``LSM_ATTR_CURRENT`` is the current, active security context of the
> +process.
> +The proc filesystem provides this value in ``/proc/self/attr/current``.
> +This is supported by the SELinux, Smack and AppArmor security modules.
> +Smack also provides this value in ``/proc/self/attr/smack/current``.
> +AppArmor also provides this value in ``/proc/self/attr/apparmor/current``.
> +
> +``LSM_ATTR_EXEC`` is the security context of the process at the time the
> +current image was executed.
> +The proc filesystem provides this value in ``/proc/self/attr/exec``.
> +This is supported by the SELinux and AppArmor security modules.
> +AppArmor also provides this value in ``/proc/self/attr/apparmor/exec``.
> +
> +``LSM_ATTR_FSCREATE`` is the security context of the process used when
> +creating file system objects.
> +The proc filesystem provides this value in ``/proc/self/attr/fscreate``.
> +This is supported by the SELinux security module.
> +
> +``LSM_ATTR_KEYCREATE`` is the security context of the process used when
> +creating key objects.
> +The proc filesystem provides this value in ``/proc/self/attr/keycreate``.
> +This is supported by the SELinux security module.
> +
> +``LSM_ATTR_PREV`` is the security context of the process at the time the
> +current security context was set.
> +The proc filesystem provides this value in ``/proc/self/attr/prev``.
> +This is supported by the SELinux and AppArmor security modules.
> +AppArmor also provides this value in ``/proc/self/attr/apparmor/prev``.
> +
> +``LSM_ATTR_SOCKCREATE`` is the security context of the process used when
> +creating socket objects.
> +The proc filesystem provides this value in ``/proc/self/attr/sockcreate``.
> +This is supported by the SELinux security module.
> +
> +Additional documentation
> +========================
> +
> +* Documentation/security/lsm.rst
> +* Documentation/security/lsm-development.rst
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 35e19594640d..92911df464da 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19007,6 +19007,7 @@ S:	Supported
>   W:	http://kernsec.org/
>   T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm.git
>   F:	security/
> +F:	include/uapi/linux/lsm.h
>   X:	security/selinux/
>   
>   SELINUX SECURITY MODULE
> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index ab2b2fafa4a4..fba8881d2bb5 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -41,6 +41,18 @@ 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 char	*name;
> +	u64		id;
> +};
> +
>   /*
>    * Security module hook list structure.
>    * For use with generic list macros for common operations.
> @@ -49,7 +61,7 @@ struct security_hook_list {
>   	struct hlist_node		list;
>   	struct hlist_head		*head;
>   	union security_list_options	hook;
> -	const char			*lsm;
> +	struct lsm_id			*lsmid;

We should use `const struct lsm_id` here.


>   } __randomize_layout;
>   
>   /*
> @@ -84,7 +96,7 @@ 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);

const 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..f27c9a9cc376
> --- /dev/null
> +++ b/include/uapi/linux/lsm.h
> @@ -0,0 +1,54 @@
> +/* 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 tokens to identify Linux Security Modules (LSMs)
> + *
> + * These token values are used to uniquely identify specific LSMs
> + * in the kernel as well as in the kernel's LSM userspace API.
> + *
> + * A value of zero/0 is considered undefined and should not be used
> + * outside the kernel. Values 1-99 are reserved for potential
> + * future use.
> + */
> +#define LSM_ID_UNDEF		0
> +#define LSM_ID_CAPABILITY	100
> +#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
> +
> +/*
> + * LSM_ATTR_XXX definitions identify different LSM attributes
> + * which are used in the kernel's LSM userspace API. Support
> + * for these attributes vary across the different LSMs. None
> + * are required.
> + *
> + * A value of zero/0 is considered undefined and should not be used
> + * outside the kernel. Values 1-99 are reserved for potential
> + * future use.
> + */
> +#define LSM_ATTR_UNDEF		0
> +#define LSM_ATTR_CURRENT	100
> +#define LSM_ATTR_EXEC		101
> +#define LSM_ATTR_FSCREATE	102
> +#define LSM_ATTR_KEYCREATE	103
> +#define LSM_ATTR_PREV		104
> +#define LSM_ATTR_SOCKCREATE	105
> +
> +#endif /* _UAPI_LINUX_LSM_H */
> diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
> index f431251ffb91..308cb3a281c3 100644
> --- a/security/apparmor/lsm.c
> +++ b/security/apparmor/lsm.c
> @@ -24,6 +24,7 @@
>   #include <linux/zstd.h>
>   #include <net/sock.h>
>   #include <uapi/linux/mount.h>
> +#include <uapi/linux/lsm.h>
>   
>   #include "include/apparmor.h"
>   #include "include/apparmorfs.h"
> @@ -1215,6 +1216,11 @@ struct lsm_blob_sizes apparmor_blob_sizes __ro_after_init = {
>   	.lbs_task = sizeof(struct aa_task_ctx),
>   };
>   
> +static struct lsm_id apparmor_lsmid __ro_after_init = {

const struct lsm_id apparmor_lsmid = {


> +	.name = "apparmor",
> +	.id = LSM_ID_APPARMOR,
> +};
> +
>   static struct security_hook_list apparmor_hooks[] __ro_after_init = {
>   	LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
>   	LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
> @@ -1904,7 +1910,7 @@ 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 cfaf1d0e6a5f..7e7bdc1b7979 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[] __ro_after_init = {
>   	#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
> @@ -15,9 +16,15 @@ static struct security_hook_list bpf_lsm_hooks[] __ro_after_init = {
>   	LSM_HOOK_INIT(task_free, bpf_task_storage_free),
>   };
>   
> +static struct lsm_id bpf_lsmid __ro_after_init = {

const struct lsm_id bpf_lsmid = {

Ditto for all other struct lsm_id variables.


> +	.name = "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 0b3fc2f3afe7..44c2577105f7 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
> @@ -1440,6 +1441,11 @@ int cap_mmap_file(struct file *file, unsigned long reqprot,
>   
>   #ifdef CONFIG_SECURITY
>   
> +static struct lsm_id capability_lsmid __ro_after_init = {
> +	.name = "capability",
> +	.id = LSM_ID_CAPABILITY,
> +};
> +
>   static struct security_hook_list capability_hooks[] __ro_after_init = {
>   	LSM_HOOK_INIT(capable, cap_capable),
>   	LSM_HOOK_INIT(settime, cap_settime),
> @@ -1464,7 +1470,7 @@ static struct security_hook_list capability_hooks[] __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 13dff2a31545..786af18c4a1c 100644
> --- a/security/landlock/cred.c
> +++ b/security/landlock/cred.c
> @@ -42,5 +42,5 @@ static struct security_hook_list landlock_hooks[] __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 1c0c198f6fdb..db5ebecfbf02 100644
> --- a/security/landlock/fs.c
> +++ b/security/landlock/fs.c
> @@ -1307,5 +1307,5 @@ static struct security_hook_list landlock_hooks[] __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 8a06d6c492bf..2bfc533d36e4 100644
> --- a/security/landlock/ptrace.c
> +++ b/security/landlock/ptrace.c
> @@ -116,5 +116,5 @@ static struct security_hook_list landlock_hooks[] __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 0f6113528fa4..f5ec82a1c381 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"
> @@ -24,6 +25,11 @@ struct lsm_blob_sizes landlock_blob_sizes __ro_after_init = {
>   	.lbs_superblock = sizeof(struct landlock_superblock_security),
>   };
>   
> +struct lsm_id landlock_lsmid __ro_after_init = {
> +	.name = 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 ebae964f7cc9..14202ee4a362 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"
>   
> @@ -208,6 +209,11 @@ static int loadpin_load_data(enum kernel_load_data_id id, bool contents)
>   	return loadpin_check(NULL, (enum kernel_read_file_id) id);
>   }
>   
> +static struct lsm_id loadpin_lsmid __ro_after_init = {
> +	.name = "loadpin",
> +	.id = LSM_ID_LOADPIN,
> +};
> +
>   static struct security_hook_list loadpin_hooks[] __ro_after_init = {
>   	LSM_HOOK_INIT(sb_free_security, loadpin_sb_free_security),
>   	LSM_HOOK_INIT(kernel_read_file, loadpin_read_file),
> @@ -259,7 +265,8 @@ static int __init loadpin_init(void)
>   	if (!register_sysctl("kernel/loadpin", loadpin_sysctl_table))
>   		pr_notice("sysctl registration failed!\n");
>   #endif
> -	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 68d19632aeb7..aa109b5811d9 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[] __ro_after_init = {
>   	LSM_HOOK_INIT(locked_down, lockdown_is_locked_down),
>   };
>   
> +static struct lsm_id lockdown_lsmid __ro_after_init = {
> +	.name = "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..24bbab457623 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 __ro_after_init = {
> +	.name = "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 d5ff7ff45b77..e56714ef045a 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -512,17 +512,17 @@ 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);
>   	}
>   
> @@ -531,7 +531,7 @@ 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->name, &lsm_names) < 0)
>   			panic("%s - Cannot get early memory.\n", __func__);
>   	}
>   }
> @@ -3778,7 +3778,7 @@ 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->name))
>   			continue;
>   		return hp->hook.getprocattr(p, name, value);
>   	}
> @@ -3803,7 +3803,7 @@ 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->name))
>   			continue;
>   		return hp->hook.setprocattr(name, value, size);
>   	}
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 79b4890e9936..49ec74bc006c 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"
> @@ -6890,6 +6891,11 @@ static int selinux_uring_cmd(struct io_uring_cmd *ioucmd)
>   }
>   #endif /* CONFIG_IO_URING */
>   
> +static struct lsm_id selinux_lsmid __ro_after_init = {
> +	.name = "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,
> @@ -7210,7 +7216,8 @@ 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 7a3e9ab137d8..cf847cfe5ed8 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"
> @@ -4840,6 +4841,11 @@ struct lsm_blob_sizes smack_blob_sizes __ro_after_init = {
>   	.lbs_superblock = sizeof(struct superblock_smack),
>   };
>   
> +static struct lsm_id smack_lsmid __ro_after_init = {
> +	.name = "smack",
> +	.id = LSM_ID_SMACK,
> +};
> +
>   static struct security_hook_list smack_hooks[] __ro_after_init = {
>   	LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check),
>   	LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
> @@ -5046,7 +5052,7 @@ 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 25006fddc964..e2efc94ec481 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"
>   
>   /**
> @@ -542,6 +543,11 @@ static void tomoyo_task_free(struct task_struct *task)
>   	}
>   }
>   
> +static struct lsm_id tomoyo_lsmid __ro_after_init = {
> +	.name = "tomoyo",
> +	.id = LSM_ID_TOMOYO,
> +};
> +
>   /*
>    * tomoyo_security_ops is a "struct security_operations" which is used for
>    * registering TOMOYO.
> @@ -595,7 +601,8 @@ 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 2503cf153d4a..31b52685e041 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 __ro_after_init = {
> +	.name = "yama",
> +	.id = LSM_ID_YAMA,
> +};
> +
>   static struct security_hook_list yama_hooks[] __ro_after_init = {
>   	LSM_HOOK_INIT(ptrace_access_check, yama_ptrace_access_check),
>   	LSM_HOOK_INIT(ptrace_traceme, yama_ptrace_traceme),
> @@ -471,7 +477,7 @@ 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;
>   }