Merge tag 'blob-stacking-security-next' of https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into next-general

LSM: Module stacking for SARA and Landlock

The combined series of LSM refactoring and addition of blob-sharing for
SARA and Landlock.

From Casey:

v5: Include Kees Cook's rework of the lsm command
line interface.
v4: Finer granularity in the patches and other
cleanups suggested by Kees Cook.
Removed dead code created by the removal of SELinux
credential blob poisoning.
v3: Add ipc blob for SARA and task blob for Landlock.
Removing the SELinux cred blob pointer poisoning
results selinux_is_enabled() being unused, so it and
all it's overhead has been removed.
Broke up the cred infrastructure patch.
v2: Reduce the patchset to what is required to support
the proposed SARA and LandLock security modules

The SARA security module is intended to be used
in conjunction with other security modules. It requires
state to be maintained for the credential, which
in turn requires a mechanism for sharing the credential
security blob. It also uses the ipc security blob. The
module also requires mechanism for user space manipulation
of the credential information, hence an additional
subdirectory in /proc/.../attr.

The LandLock security module provides user configurable
policy in the secmark mechanism. It requires data in
the credential, file, inode and task security blobs. For
this to be used along side the existing "major" security
modules mechanism for sharing these blobs are provided.

A side effect of providing sharing of the crendential
security blob is that the TOMOYO module can be used at
the same time as the other "major" modules.

The mechanism for configuring which security modules are
enabled has to change when stacking in enabled. Any
module that uses just the security blobs that are shared
can be selected. Additionally, one other "major" module
can be selected.

The security module stacking issues around networking and
IPC are not addressed here as they are beyond what is
required for TOMOYO, SARA and LandLock.

Documentation/admin-guide/LSM/index.rst

···
 specific changes to system operation when these tweaks are not available
 in the core functionality of Linux itself.
 
-Without a specific LSM built into the kernel, the default LSM will be the
-Linux capabilities system. Most LSMs choose to extend the capabilities
-system, building their checks on top of the defined capability hooks.
+The Linux capabilities modules will always be included. This may be
+followed by any number of "minor" modules and at most one "major" module.
 For more details on capabilities, see ``capabilities(7)`` in the Linux
 man-pages project.
 
···
 order in which checks are made. The capability module will always
 be first, followed by any "minor" modules (e.g. Yama) and then
 the one "major" module (e.g. SELinux) if there is one configured.
+
+Process attributes associated with "major" security modules should
+be accessed and maintained using the special files in ``/proc/.../attr``.
+A security module may maintain a module specific subdirectory there,
+named after the module. ``/proc/.../attr/smack`` is provided by the Smack
+security module and contains all its special files. The files directly
+in ``/proc/.../attr`` remain as legacy interfaces for modules that provide
+subdirectories.
 
 .. toctree::
    :maxdepth: 1

Documentation/admin-guide/kernel-parameters.txt

···
 
 	lsm.debug	[SECURITY] Enable LSM initialization debugging output.
 
+	lsm=lsm1,...,lsmN
+			[SECURITY] Choose order of LSM initialization. This
+			overrides CONFIG_LSM.
+
 	machvec=	[IA-64] Force the use of a particular machine-vector
 			(machvec) in a generic kernel.
 			Example: machvec=hpzx1_swiotlb

fs/proc/base.c

···
 #define REG(NAME, MODE, fops)				\
 	NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
 #define ONE(NAME, MODE, show)				\
-	NOD(NAME, (S_IFREG|(MODE)), 			\
+	NOD(NAME, (S_IFREG|(MODE)),			\
 		NULL, &proc_single_file_operations,	\
 		{ .proc_show = show } )
+#define ATTR(LSM, NAME, MODE)				\
+	NOD(NAME, (S_IFREG|(MODE)),			\
+		NULL, &proc_pid_attr_operations,	\
+		{ .lsm = LSM })
 
 /*
  * Count the number of hardlinks for the pid_entry table, excluding the .
···
 	if (!task)
 		return -ESRCH;
 
-	length = security_getprocattr(task,
+	length = security_getprocattr(task, PROC_I(inode)->op.lsm,
 				      (char*)file->f_path.dentry->d_name.name,
 				      &p);
 	put_task_struct(task);
···
 	if (rv < 0)
 		goto out_free;
 
-	rv = security_setprocattr(file->f_path.dentry->d_name.name, page, count);
+	rv = security_setprocattr(PROC_I(inode)->op.lsm,
+				  file->f_path.dentry->d_name.name, page,
+				  count);
 	mutex_unlock(&current->signal->cred_guard_mutex);
 out_free:
 	kfree(page);
···
 	.llseek		= generic_file_llseek,
 };
 
+#define LSM_DIR_OPS(LSM) \
+static int proc_##LSM##_attr_dir_iterate(struct file *filp, \
+			     struct dir_context *ctx) \
+{ \
+	return proc_pident_readdir(filp, ctx, \
+				   LSM##_attr_dir_stuff, \
+				   ARRAY_SIZE(LSM##_attr_dir_stuff)); \
+} \
+\
+static const struct file_operations proc_##LSM##_attr_dir_ops = { \
+	.read		= generic_read_dir, \
+	.iterate	= proc_##LSM##_attr_dir_iterate, \
+	.llseek		= default_llseek, \
+}; \
+\
+static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \
+				struct dentry *dentry, unsigned int flags) \
+{ \
+	return proc_pident_lookup(dir, dentry, \
+				  LSM##_attr_dir_stuff, \
+				  ARRAY_SIZE(LSM##_attr_dir_stuff)); \
+} \
+\
+static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \
+	.lookup		= proc_##LSM##_attr_dir_lookup, \
+	.getattr	= pid_getattr, \
+	.setattr	= proc_setattr, \
+}
+
+#ifdef CONFIG_SECURITY_SMACK
+static const struct pid_entry smack_attr_dir_stuff[] = {
+	ATTR("smack", "current",	0666),
+};
+LSM_DIR_OPS(smack);
+#endif
+
 static const struct pid_entry attr_dir_stuff[] = {
-	REG("current",    S_IRUGO|S_IWUGO, proc_pid_attr_operations),
-	REG("prev",       S_IRUGO,	   proc_pid_attr_operations),
-	REG("exec",       S_IRUGO|S_IWUGO, proc_pid_attr_operations),
-	REG("fscreate",   S_IRUGO|S_IWUGO, proc_pid_attr_operations),
-	REG("keycreate",  S_IRUGO|S_IWUGO, proc_pid_attr_operations),
-	REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
+	ATTR(NULL, "current",		0666),
+	ATTR(NULL, "prev",		0444),
+	ATTR(NULL, "exec",		0666),
+	ATTR(NULL, "fscreate",		0666),
+	ATTR(NULL, "keycreate",		0666),
+	ATTR(NULL, "sockcreate",	0666),
+#ifdef CONFIG_SECURITY_SMACK
+	DIR("smack",			0555,
+	    proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
+#endif
 };
 
 static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx)

fs/proc/internal.h

···
 	int (*proc_show)(struct seq_file *m,
 		struct pid_namespace *ns, struct pid *pid,
 		struct task_struct *task);
+	const char *lsm;
 };
 
 struct proc_inode {

include/linux/cred.h

···
 #include <linux/capability.h>
 #include <linux/init.h>
 #include <linux/key.h>
-#include <linux/selinux.h>
 #include <linux/atomic.h>
 #include <linux/uidgid.h>
 #include <linux/sched.h>

include/linux/lsm_hooks.h

···
 } __randomize_layout;
 
 /*
+ * Security blob size or offset data.
+ */
+struct lsm_blob_sizes {
+	int	lbs_cred;
+	int	lbs_file;
+	int	lbs_inode;
+	int	lbs_ipc;
+	int	lbs_msg_msg;
+	int	lbs_task;
+};
+
+/*
  * Initializing a security_hook_list structure takes
  * up a lot of space in a source file. This macro takes
  * care of the common case and reduces the amount of
···
 extern void security_add_hooks(struct security_hook_list *hooks, int count,
 				char *lsm);
 
+#define LSM_FLAG_LEGACY_MAJOR	BIT(0)
+#define LSM_FLAG_EXCLUSIVE	BIT(1)
+
+enum lsm_order {
+	LSM_ORDER_FIRST = -1,	/* This is only for capabilities. */
+	LSM_ORDER_MUTABLE = 0,
+};
+
 struct lsm_info {
 	const char *name;	/* Required. */
+	enum lsm_order order;	/* Optional: default is LSM_ORDER_MUTABLE */
+	unsigned long flags;	/* Optional: flags describing LSM */
+	int *enabled;		/* Optional: controlled by CONFIG_LSM */
 	int (*init)(void);	/* Required. */
+	struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */
 };
 
 extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
···
 #define __lsm_ro_after_init	__ro_after_init
 #endif /* CONFIG_SECURITY_WRITABLE_HOOKS */
 
-extern int __init security_module_enable(const char *module);
-extern void __init capability_add_hooks(void);
-#ifdef CONFIG_SECURITY_YAMA
-extern void __init yama_add_hooks(void);
-#else
-static inline void __init yama_add_hooks(void) { }
-#endif
-#ifdef CONFIG_SECURITY_LOADPIN
-void __init loadpin_add_hooks(void);
-#else
-static inline void loadpin_add_hooks(void) { };
+extern int lsm_inode_alloc(struct inode *inode);
+
+#ifdef CONFIG_SECURITY
+void __init lsm_early_cred(struct cred *cred);
+void __init lsm_early_task(struct task_struct *task);
 #endif
 
 #endif /* ! __LINUX_LSM_HOOKS_H */

include/linux/security.h

···
 int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
 			unsigned nsops, int alter);
 void security_d_instantiate(struct dentry *dentry, struct inode *inode);
-int security_getprocattr(struct task_struct *p, char *name, char **value);
-int security_setprocattr(const char *name, void *value, size_t size);
+int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
+			 char **value);
+int security_setprocattr(const char *lsm, const char *name, void *value,
+			 size_t size);
 int security_netlink_send(struct sock *sk, struct sk_buff *skb);
 int security_ismaclabel(const char *name);
 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
···
 	return 0;
 }
 
-static inline void security_d_instantiate(struct dentry *dentry, struct inode *inode)
+static inline void security_d_instantiate(struct dentry *dentry,
+					  struct inode *inode)
 { }
 
-static inline int security_getprocattr(struct task_struct *p, char *name, char **value)
+static inline int security_getprocattr(struct task_struct *p, const char *lsm,
+				       char *name, char **value)
 {
 	return -EINVAL;
 }
 
-static inline int security_setprocattr(char *name, void *value, size_t size)
+static inline int security_setprocattr(const char *lsm, char *name,
+				       void *value, size_t size)
 {
 	return -EINVAL;
 }

include/linux/selinux.h

···
-/*
- * SELinux services exported to the rest of the kernel.
- *
- * Author: James Morris <[e-mail]>
- *
- * Copyright (C) 2005 Red Hat, Inc., James Morris <[e-mail]>
- * Copyright (C) 2006 Trusted Computer Solutions, Inc. <[e-mail]>
- * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2,
- * as published by the Free Software Foundation.
- */
-#ifndef _LINUX_SELINUX_H
-#define _LINUX_SELINUX_H
-
-struct selinux_audit_rule;
-struct audit_context;
-struct kern_ipc_perm;
-
-#ifdef CONFIG_SECURITY_SELINUX
-
-/**
- * selinux_is_enabled - is SELinux enabled?
- */
-bool selinux_is_enabled(void);
-#else
-
-static inline bool selinux_is_enabled(void)
-{
-	return false;
-}
-#endif	/* CONFIG_SECURITY_SELINUX */
-
-#endif /* _LINUX_SELINUX_H */

kernel/cred.c

···
 {
 	if (cred->magic != CRED_MAGIC)
 		return true;
-#ifdef CONFIG_SECURITY_SELINUX
-	/*
-	 * cred->security == NULL if security_cred_alloc_blank() or
-	 * security_prepare_creds() returned an error.
-	 */
-	if (selinux_is_enabled() && cred->security) {
-		if ((unsigned long) cred->security < PAGE_SIZE)
-			return true;
-		if ((*(u32 *)cred->security & 0xffffff00) ==
-		    (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8))
-			return true;
-	}
-#endif
 	return false;
 }
 EXPORT_SYMBOL(creds_are_invalid);

security/Kconfig

···
 
 source "security/integrity/Kconfig"
 
-choice
-	prompt "Default security module"
-	default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
-	default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
-	default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
-	default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
-	default DEFAULT_SECURITY_DAC
-
+config LSM
+	string "Ordered list of enabled LSMs"
+	default "yama,loadpin,integrity,selinux,smack,tomoyo,apparmor"
 	help
-	  Select the security module that will be used by default if the
-	  kernel parameter security= is not specified.
+	  A comma-separated list of LSMs, in initialization order.
+	  Any LSMs left off this list will be ignored. This can be
+	  controlled at boot with the "lsm=" parameter.
 
-	config DEFAULT_SECURITY_SELINUX
-		bool "SELinux" if SECURITY_SELINUX=y
-
-	config DEFAULT_SECURITY_SMACK
-		bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
-
-	config DEFAULT_SECURITY_TOMOYO
-		bool "TOMOYO" if SECURITY_TOMOYO=y
-
-	config DEFAULT_SECURITY_APPARMOR
-		bool "AppArmor" if SECURITY_APPARMOR=y
-
-	config DEFAULT_SECURITY_DAC
-		bool "Unix Discretionary Access Controls"
-
-endchoice
-
-config DEFAULT_SECURITY
-	string
-	default "selinux" if DEFAULT_SECURITY_SELINUX
-	default "smack" if DEFAULT_SECURITY_SMACK
-	default "tomoyo" if DEFAULT_SECURITY_TOMOYO
-	default "apparmor" if DEFAULT_SECURITY_APPARMOR
-	default "" if DEFAULT_SECURITY_DAC
+	  If unsure, leave this as the default.
 
 endmenu
 

security/apparmor/Kconfig

···
 
 	  If you are unsure how to answer this question, answer N.
 
-config SECURITY_APPARMOR_BOOTPARAM_VALUE
-	int "AppArmor boot parameter default value"
-	depends on SECURITY_APPARMOR
-	range 0 1
-	default 1
-	help
-	  This option sets the default value for the kernel parameter
-	  'apparmor', which allows AppArmor to be enabled or disabled
-          at boot.  If this option is set to 0 (zero), the AppArmor
-	  kernel parameter will default to 0, disabling AppArmor at
-	  boot.  If this option is set to 1 (one), the AppArmor
-	  kernel parameter will default to 1, enabling AppArmor at
-	  boot.
-
-	  If you are unsure how to answer this question, answer 1.
-
 config SECURITY_APPARMOR_HASH
 	bool "Enable introspection of sha1 hashes for loaded profiles"
 	depends on SECURITY_APPARMOR

security/apparmor/domain.c

···
 	}
 	aa_put_label(cred_label(bprm->cred));
 	/* transfer reference, released when cred is freed */
-	cred_label(bprm->cred) = new;
+	set_cred_label(bprm->cred, new);
 
 done:
 	aa_put_label(label);

security/apparmor/include/cred.h

···
 #include "policy_ns.h"
 #include "task.h"
 
-#define cred_label(X) ((X)->security)
+static inline struct aa_label *cred_label(const struct cred *cred)
+{
+	struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
 
+	AA_BUG(!blob);
+	return *blob;
+}
+
+static inline void set_cred_label(const struct cred *cred,
+				  struct aa_label *label)
+{
+	struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
+
+	AA_BUG(!blob);
+	*blob = label;
+}
 
 /**
  * aa_cred_raw_label - obtain cred's label

security/apparmor/include/file.h

···
 				 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
 				 AA_EXEC_MMAP | AA_MAY_LINK)
 
-#define file_ctx(X) ((struct aa_file_ctx *)(X)->f_security)
+static inline struct aa_file_ctx *file_ctx(struct file *file)
+{
+	return file->f_security + apparmor_blob_sizes.lbs_file;
+}
 
 /* struct aa_file_ctx - the AppArmor context the file was opened in
  * @lock: lock to update the ctx

security/apparmor/include/lib.h

···
 
 #include <linux/slab.h>
 #include <linux/fs.h>
+#include <linux/lsm_hooks.h>
 
 #include "match.h"
 
···
 const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name,
 			     size_t *ns_len);
 void aa_info_message(const char *str);
+
+/* Security blob offsets */
+extern struct lsm_blob_sizes apparmor_blob_sizes;
 
 /**
  * aa_strneq - compare null terminated @str to a non null terminated substring

security/apparmor/include/task.h

···
 #ifndef __AA_TASK_H
 #define __AA_TASK_H
 
-#define task_ctx(X) ((X)->security)
+static inline struct aa_task_ctx *task_ctx(struct task_struct *task)
+{
+	return task->security;
+}
 
 /*
  * struct aa_task_ctx - information for current task label change
···
 struct aa_label *aa_get_task_label(struct task_struct *task);
 
 /**
- * aa_alloc_task_ctx - allocate a new task_ctx
- * @flags: gfp flags for allocation
- *
- * Returns: allocated buffer or NULL on failure
- */
-static inline struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags)
-{
-	return kzalloc(sizeof(struct aa_task_ctx), flags);
-}
-
-/**
  * aa_free_task_ctx - free a task_ctx
  * @ctx: task_ctx to free (MAYBE NULL)
  */
···
 		aa_put_label(ctx->nnp);
 		aa_put_label(ctx->previous);
 		aa_put_label(ctx->onexec);
-
-		kzfree(ctx);
 	}
 }
 

security/apparmor/lsm.c

···
 static void apparmor_cred_free(struct cred *cred)
 {
 	aa_put_label(cred_label(cred));
-	cred_label(cred) = NULL;
+	set_cred_label(cred, NULL);
 }
 
 /*
···
  */
 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
 {
-	cred_label(cred) = NULL;
+	set_cred_label(cred, NULL);
 	return 0;
 }
 
···
 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
 				 gfp_t gfp)
 {
-	cred_label(new) = aa_get_newest_label(cred_label(old));
+	set_cred_label(new, aa_get_newest_label(cred_label(old)));
 	return 0;
 }
 
···
  */
 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
 {
-	cred_label(new) = aa_get_newest_label(cred_label(old));
+	set_cred_label(new, aa_get_newest_label(cred_label(old)));
 }
 
 static void apparmor_task_free(struct task_struct *task)
 {
 
 	aa_free_task_ctx(task_ctx(task));
-	task_ctx(task) = NULL;
 }
 
 static int apparmor_task_alloc(struct task_struct *task,
 			       unsigned long clone_flags)
 {
-	struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL);
-
-	if (!new)
-		return -ENOMEM;
+	struct aa_task_ctx *new = task_ctx(task);
 
 	aa_dup_task_ctx(new, task_ctx(current));
-	task_ctx(task) = new;
 
 	return 0;
 }
···
 
 static int apparmor_file_alloc_security(struct file *file)
 {
-	int error = 0;
-
-	/* freed by apparmor_file_free_security */
+	struct aa_file_ctx *ctx = file_ctx(file);
 	struct aa_label *label = begin_current_label_crit_section();
-	file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL);
-	if (!file_ctx(file))
-		error = -ENOMEM;
-	end_current_label_crit_section(label);
 
-	return error;
+	spin_lock_init(&ctx->lock);
+	rcu_assign_pointer(ctx->label, aa_get_label(label));
+	end_current_label_crit_section(label);
+	return 0;
 }
 
 static void apparmor_file_free_security(struct file *file)
 {
-	aa_free_file_ctx(file_ctx(file));
+	struct aa_file_ctx *ctx = file_ctx(file);
+
+	if (ctx)
+		aa_put_label(rcu_access_pointer(ctx->label));
 }
 
 static int common_file_perm(const char *op, struct file *file, u32 mask)
···
 }
 #endif
 
+/*
+ * The cred blob is a pointer to, not an instance of, an aa_task_ctx.
+ */
+struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
+	.lbs_cred = sizeof(struct aa_task_ctx *),
+	.lbs_file = sizeof(struct aa_file_ctx),
+	.lbs_task = sizeof(struct aa_task_ctx),
+};
+
 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),
···
 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
 
 /* Boot time disable flag */
-static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
-module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
+static int apparmor_enabled __lsm_ro_after_init = 1;
+module_param_named(enabled, apparmor_enabled, int, 0444);
 
 static int __init apparmor_enabled_setup(char *str)
 {
···
 static int __init set_init_ctx(void)
 {
 	struct cred *cred = (struct cred *)current->real_cred;
-	struct aa_task_ctx *ctx;
 
-	ctx = aa_alloc_task_ctx(GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
-
-	cred_label(cred) = aa_get_label(ns_unconfined(root_ns));
-	task_ctx(current) = ctx;
+	lsm_early_cred(cred);
+	lsm_early_task(current);
+	set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
 
 	return 0;
 }
···
 {
 	int error;
 
-	if (!apparmor_enabled || !security_module_enable("apparmor")) {
-		aa_info_message("AppArmor disabled by boot time parameter");
-		apparmor_enabled = false;
-		return 0;
-	}
-
 	aa_secids_init();
 
 	error = aa_setup_dfa_engine();
···
 
 DEFINE_LSM(apparmor) = {
 	.name = "apparmor",
+	.flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
+	.enabled = &apparmor_enabled,
+	.blobs = &apparmor_blob_sizes,
 	.init = apparmor_init,
 };

security/apparmor/task.c

···
 	 */
 	aa_get_label(label);
 	aa_put_label(cred_label(new));
-	cred_label(new) = label;
+	set_cred_label(new, label);
 
 	commit_creds(new);
 	return 0;
···
 		return -EACCES;
 	}
 
-	cred_label(new) = aa_get_newest_label(label);
+	set_cred_label(new, aa_get_newest_label(label));
 	/* clear exec on switching context */
 	aa_put_label(ctx->onexec);
 	ctx->onexec = NULL;
···
 		return -ENOMEM;
 
 	aa_put_label(cred_label(new));
-	cred_label(new) = aa_get_newest_label(ctx->previous);
+	set_cred_label(new, aa_get_newest_label(ctx->previous));
 	AA_BUG(!cred_label(new));
 	/* clear exec && prev information when restoring to previous context */
 	aa_clear_task_ctx_trans(ctx);

security/commoncap.c

···
 	LSM_HOOK_INIT(vm_enough_memory, cap_vm_enough_memory),
 };
 
-void __init capability_add_hooks(void)
+static int __init capability_init(void)
 {
 	security_add_hooks(capability_hooks, ARRAY_SIZE(capability_hooks),
 				"capability");
+	return 0;
 }
+
+DEFINE_LSM(capability) = {
+	.name = "capability",
+	.order = LSM_ORDER_FIRST,
+	.init = capability_init,
+};
 
 #endif /* CONFIG_SECURITY */

security/loadpin/loadpin.c

···
 	LSM_HOOK_INIT(kernel_load_data, loadpin_load_data),
 };
 
-void __init loadpin_add_hooks(void)
+static int __init loadpin_init(void)
 {
 	pr_info("ready to pin (currently %senforcing)\n",
 		enforce ? "" : "not ");
 	security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin");
+	return 0;
 }
+
+DEFINE_LSM(loadpin) = {
+	.name = "loadpin",
+	.init = loadpin_init,
+};
 
 /* Should not be mutable after boot, so not listed in sysfs (perm == 0). */
 module_param(enforce, int, 0);

security/security.c

···
 #include <linux/personality.h>
 #include <linux/backing-dev.h>
 #include <linux/string.h>
+#include <linux/msg.h>
 #include <net/flow.h>
 
 #define MAX_LSM_EVM_XATTR	2
 
-/* Maximum number of letters for an LSM name string */
-#define SECURITY_NAME_MAX	10
+/* How many LSMs were built into the kernel? */
+#define LSM_COUNT (__end_lsm_info - __start_lsm_info)
 
 struct security_hook_heads security_hook_heads __lsm_ro_after_init;
 static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
 
+static struct kmem_cache *lsm_file_cache;
+static struct kmem_cache *lsm_inode_cache;
+
 char *lsm_names;
+static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init;
+
 /* Boot-time LSM user choice */
-static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
-	CONFIG_DEFAULT_SECURITY;
+static __initdata const char *chosen_lsm_order;
+static __initdata const char *chosen_major_lsm;
+
+static __initconst const char * const builtin_lsm_order = CONFIG_LSM;
+
+/* Ordered list of LSMs to initialize. */
+static __initdata struct lsm_info **ordered_lsms;
+static __initdata struct lsm_info *exclusive;
 
 static __initdata bool debug;
 #define init_debug(...)						\
···
 			pr_info(__VA_ARGS__);			\
 	} while (0)
 
-static void __init major_lsm_init(void)
+static bool __init is_enabled(struct lsm_info *lsm)
 {
-	struct lsm_info *lsm;
-	int ret;
+	if (!lsm->enabled)
+		return false;
 
-	for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+	return *lsm->enabled;
+}
+
+/* Mark an LSM's enabled flag. */
+static int lsm_enabled_true __initdata = 1;
+static int lsm_enabled_false __initdata = 0;
+static void __init set_enabled(struct lsm_info *lsm, bool enabled)
+{
+	/*
+	 * When an LSM hasn't configured an enable variable, we can use
+	 * a hard-coded location for storing the default enabled state.
+	 */
+	if (!lsm->enabled) {
+		if (enabled)
+			lsm->enabled = &lsm_enabled_true;
+		else
+			lsm->enabled = &lsm_enabled_false;
+	} else if (lsm->enabled == &lsm_enabled_true) {
+		if (!enabled)
+			lsm->enabled = &lsm_enabled_false;
+	} else if (lsm->enabled == &lsm_enabled_false) {
+		if (enabled)
+			lsm->enabled = &lsm_enabled_true;
+	} else {
+		*lsm->enabled = enabled;
+	}
+}
+
+/* Is an LSM already listed in the ordered LSMs list? */
+static bool __init exists_ordered_lsm(struct lsm_info *lsm)
+{
+	struct lsm_info **check;
+
+	for (check = ordered_lsms; *check; check++)
+		if (*check == lsm)
+			return true;
+
+	return false;
+}
+
+/* Append an LSM to the list of ordered LSMs to initialize. */
+static int last_lsm __initdata;
+static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
+{
+	/* Ignore duplicate selections. */
+	if (exists_ordered_lsm(lsm))
+		return;
+
+	if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from))
+		return;
+
+	/* Enable this LSM, if it is not already set. */
+	if (!lsm->enabled)
+		lsm->enabled = &lsm_enabled_true;
+	ordered_lsms[last_lsm++] = lsm;
+
+	init_debug("%s ordering: %s (%sabled)\n", from, lsm->name,
+		   is_enabled(lsm) ? "en" : "dis");
+}
+
+/* Is an LSM allowed to be initialized? */
+static bool __init lsm_allowed(struct lsm_info *lsm)
+{
+	/* Skip if the LSM is disabled. */
+	if (!is_enabled(lsm))
+		return false;
+
+	/* Not allowed if another exclusive LSM already initialized. */
+	if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
+		init_debug("exclusive disabled: %s\n", lsm->name);
+		return false;
+	}
+
+	return true;
+}
+
+static void __init lsm_set_blob_size(int *need, int *lbs)
+{
+	int offset;
+
+	if (*need > 0) {
+		offset = *lbs;
+		*lbs += *need;
+		*need = offset;
+	}
+}
+
+static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
+{
+	if (!needed)
+		return;
+
+	lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
+	lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
+	/*
+	 * The inode blob gets an rcu_head in addition to
+	 * what the modules might need.
+	 */
+	if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
+		blob_sizes.lbs_inode = sizeof(struct rcu_head);
+	lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
+	lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
+	lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
+	lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
+}
+
+/* Prepare LSM for initialization. */
+static void __init prepare_lsm(struct lsm_info *lsm)
+{
+	int enabled = lsm_allowed(lsm);
+
+	/* Record enablement (to handle any following exclusive LSMs). */
+	set_enabled(lsm, enabled);
+
+	/* If enabled, do pre-initialization work. */
+	if (enabled) {
+		if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
+			exclusive = lsm;
+			init_debug("exclusive chosen: %s\n", lsm->name);
+		}
+
+		lsm_set_blob_sizes(lsm->blobs);
+	}
+}
+
+/* Initialize a given LSM, if it is enabled. */
+static void __init initialize_lsm(struct lsm_info *lsm)
+{
+	if (is_enabled(lsm)) {
+		int ret;
+
 		init_debug("initializing %s\n", lsm->name);
 		ret = lsm->init();
 		WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
 	}
+}
+
+/* Populate ordered LSMs list from comma-separated LSM name list. */
+static void __init ordered_lsm_parse(const char *order, const char *origin)
+{
+	struct lsm_info *lsm;
+	char *sep, *name, *next;
+
+	/* LSM_ORDER_FIRST is always first. */
+	for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+		if (lsm->order == LSM_ORDER_FIRST)
+			append_ordered_lsm(lsm, "first");
+	}
+
+	/* Process "security=", if given. */
+	if (chosen_major_lsm) {
+		struct lsm_info *major;
+
+		/*
+		 * To match the original "security=" behavior, this
+		 * explicitly does NOT fallback to another Legacy Major
+		 * if the selected one was separately disabled: disable
+		 * all non-matching Legacy Major LSMs.
+		 */
+		for (major = __start_lsm_info; major < __end_lsm_info;
+		     major++) {
+			if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
+			    strcmp(major->name, chosen_major_lsm) != 0) {
+				set_enabled(major, false);
+				init_debug("security=%s disabled: %s\n",
+					   chosen_major_lsm, major->name);
+			}
+		}
+	}
+
+	sep = kstrdup(order, GFP_KERNEL);
+	next = sep;
+	/* Walk the list, looking for matching LSMs. */
+	while ((name = strsep(&next, ",")) != NULL) {
+		bool found = false;
+
+		for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+			if (lsm->order == LSM_ORDER_MUTABLE &&
+			    strcmp(lsm->name, name) == 0) {
+				append_ordered_lsm(lsm, origin);
+				found = true;
+			}
+		}
+
+		if (!found)
+			init_debug("%s ignored: %s\n", origin, name);
+	}
+
+	/* Process "security=", if given. */
+	if (chosen_major_lsm) {
+		for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+			if (exists_ordered_lsm(lsm))
+				continue;
+			if (strcmp(lsm->name, chosen_major_lsm) == 0)
+				append_ordered_lsm(lsm, "security=");
+		}
+	}
+
+	/* Disable all LSMs not in the ordered list. */
+	for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+		if (exists_ordered_lsm(lsm))
+			continue;
+		set_enabled(lsm, false);
+		init_debug("%s disabled: %s\n", origin, lsm->name);
+	}
+
+	kfree(sep);
+}
+
+static void __init ordered_lsm_init(void)
+{
+	struct lsm_info **lsm;
+
+	ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
+				GFP_KERNEL);
+
+	if (chosen_lsm_order)
+		ordered_lsm_parse(chosen_lsm_order, "cmdline");
+	else
+		ordered_lsm_parse(builtin_lsm_order, "builtin");
+
+	for (lsm = ordered_lsms; *lsm; lsm++)
+		prepare_lsm(*lsm);
+
+	init_debug("cred blob size     = %d\n", blob_sizes.lbs_cred);
+	init_debug("file blob size     = %d\n", blob_sizes.lbs_file);
+	init_debug("inode blob size    = %d\n", blob_sizes.lbs_inode);
+	init_debug("ipc blob size      = %d\n", blob_sizes.lbs_ipc);
+	init_debug("msg_msg blob size  = %d\n", blob_sizes.lbs_msg_msg);
+	init_debug("task blob size     = %d\n", blob_sizes.lbs_task);
+
+	/*
+	 * Create any kmem_caches needed for blobs
+	 */
+	if (blob_sizes.lbs_file)
+		lsm_file_cache = kmem_cache_create("lsm_file_cache",
+						   blob_sizes.lbs_file, 0,
+						   SLAB_PANIC, NULL);
+	if (blob_sizes.lbs_inode)
+		lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
+						    blob_sizes.lbs_inode, 0,
+						    SLAB_PANIC, NULL);
+
+	for (lsm = ordered_lsms; *lsm; lsm++)
+		initialize_lsm(*lsm);
+
+	kfree(ordered_lsms);
 }
 
 /**
···
 	     i++)
 		INIT_HLIST_HEAD(&list[i]);
 
-	/*
-	 * Load minor LSMs, with the capability module always first.
-	 */
-	capability_add_hooks();
-	yama_add_hooks();
-	loadpin_add_hooks();
-
-	/*
-	 * Load all the remaining security modules.
-	 */
-	major_lsm_init();
+	/* Load LSMs in specified order. */
+	ordered_lsm_init();
 
 	return 0;
 }
 
 /* Save user chosen LSM */
-static int __init choose_lsm(char *str)
+static int __init choose_major_lsm(char *str)
 {
-	strncpy(chosen_lsm, str, SECURITY_NAME_MAX);
+	chosen_major_lsm = str;
 	return 1;
 }
-__setup("security=", choose_lsm);
+__setup("security=", choose_major_lsm);
+
+/* Explicitly choose LSM initialization order. */
+static int __init choose_lsm_order(char *str)
+{
+	chosen_lsm_order = str;
+	return 1;
+}
+__setup("lsm=", choose_lsm_order);
 
 /* Enable LSM order debugging. */
 static int __init enable_debug(char *str)
···
 }
 
 /**
- * security_module_enable - Load given security module on boot ?
- * @module: the name of the module
- *
- * Each LSM must pass this method before registering its own operations
- * to avoid security registration races. This method may also be used
- * to check if your LSM is currently loaded during kernel initialization.
- *
- * Returns:
- *
- * true if:
- *
- * - The passed LSM is the one chosen by user at boot time,
- * - or the passed LSM is configured as the default and the user did not
- *   choose an alternate LSM at boot time.
- *
- * Otherwise, return false.
- */
-int __init security_module_enable(const char *module)
-{
-	return !strcmp(module, chosen_lsm);
-}
-
-/**
  * security_add_hooks - Add a modules hooks to the hook lists.
  * @hooks: the hooks to add
  * @count: the number of hooks to add
···
 	return atomic_notifier_chain_unregister(&lsm_notifier_chain, nb);
 }
 EXPORT_SYMBOL(unregister_lsm_notifier);
+
+/**
+ * lsm_cred_alloc - allocate a composite cred blob
+ * @cred: the cred that needs a blob
+ * @gfp: allocation type
+ *
+ * Allocate the cred blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
+{
+	if (blob_sizes.lbs_cred == 0) {
+		cred->security = NULL;
+		return 0;
+	}
+
+	cred->security = kzalloc(blob_sizes.lbs_cred, gfp);
+	if (cred->security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * lsm_early_cred - during initialization allocate a composite cred blob
+ * @cred: the cred that needs a blob
+ *
+ * Allocate the cred blob for all the modules if it's not already there
+ */
+void __init lsm_early_cred(struct cred *cred)
+{
+	int rc;
+
+	if (cred == NULL)
+		panic("%s: NULL cred.\n", __func__);
+	if (cred->security != NULL)
+		return;
+	rc = lsm_cred_alloc(cred, GFP_KERNEL);
+	if (rc)
+		panic("%s: Early cred alloc failed.\n", __func__);
+}
+
+/**
+ * lsm_file_alloc - allocate a composite file blob
+ * @file: the file that needs a blob
+ *
+ * Allocate the file blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+static int lsm_file_alloc(struct file *file)
+{
+	if (!lsm_file_cache) {
+		file->f_security = NULL;
+		return 0;
+	}
+
+	file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
+	if (file->f_security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * lsm_inode_alloc - allocate a composite inode blob
+ * @inode: the inode that needs a blob
+ *
+ * Allocate the inode blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+int lsm_inode_alloc(struct inode *inode)
+{
+	if (!lsm_inode_cache) {
+		inode->i_security = NULL;
+		return 0;
+	}
+
+	inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS);
+	if (inode->i_security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * lsm_task_alloc - allocate a composite task blob
+ * @task: the task that needs a blob
+ *
+ * Allocate the task blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+int lsm_task_alloc(struct task_struct *task)
+{
+	if (blob_sizes.lbs_task == 0) {
+		task->security = NULL;
+		return 0;
+	}
+
+	task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
+	if (task->security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * lsm_ipc_alloc - allocate a composite ipc blob
+ * @kip: the ipc that needs a blob
+ *
+ * Allocate the ipc blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+int lsm_ipc_alloc(struct kern_ipc_perm *kip)
+{
+	if (blob_sizes.lbs_ipc == 0) {
+		kip->security = NULL;
+		return 0;
+	}
+
+	kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
+	if (kip->security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * lsm_msg_msg_alloc - allocate a composite msg_msg blob
+ * @mp: the msg_msg that needs a blob
+ *
+ * Allocate the ipc blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+int lsm_msg_msg_alloc(struct msg_msg *mp)
+{
+	if (blob_sizes.lbs_msg_msg == 0) {
+		mp->security = NULL;
+		return 0;
+	}
+
+	mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
+	if (mp->security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+/**
+ * lsm_early_task - during initialization allocate a composite task blob
+ * @task: the task that needs a blob
+ *
+ * Allocate the task blob for all the modules if it's not already there
+ */
+void __init lsm_early_task(struct task_struct *task)
+{
+	int rc;
+
+	if (task == NULL)
+		panic("%s: task cred.\n", __func__);
+	if (task->security != NULL)
+		return;
+	rc = lsm_task_alloc(task);
+	if (rc)
+		panic("%s: Early task alloc failed.\n", __func__);
+}
 
 /*
  * Hook list operation macros.
···
 
 int security_inode_alloc(struct inode *inode)
 {
-	inode->i_security = NULL;
-	return call_int_hook(inode_alloc_security, 0, inode);
+	int rc = lsm_inode_alloc(inode);
+
+	if (unlikely(rc))
+		return rc;
+	rc = call_int_hook(inode_alloc_security, 0, inode);
+	if (unlikely(rc))
+		security_inode_free(inode);
+	return rc;
+}
+
+static void inode_free_by_rcu(struct rcu_head *head)
+{
+	/*
+	 * The rcu head is at the start of the inode blob
+	 */
+	kmem_cache_free(lsm_inode_cache, head);
 }
 
 void security_inode_free(struct inode *inode)
 {
 	integrity_inode_free(inode);
 	call_void_hook(inode_free_security, inode);
+	/*
+	 * The inode may still be referenced in a path walk and
+	 * a call to security_inode_permission() can be made
+	 * after inode_free_security() is called. Ideally, the VFS
+	 * wouldn't do this, but fixing that is a much harder
+	 * job. For now, simply free the i_security via RCU, and
+	 * leave the current inode->i_security pointer intact.
+	 * The inode will be freed after the RCU grace period too.
+	 */
+	if (inode->i_security)
+		call_rcu((struct rcu_head *)inode->i_security,
+				inode_free_by_rcu);
 }
 
 int security_dentry_init_security(struct dentry *dentry, int mode,
···
 
 int security_file_alloc(struct file *file)
 {
-	return call_int_hook(file_alloc_security, 0, file);
+	int rc = lsm_file_alloc(file);
+
+	if (rc)
+		return rc;
+	rc = call_int_hook(file_alloc_security, 0, file);
+	if (unlikely(rc))
+		security_file_free(file);
+	return rc;
 }
 
 void security_file_free(struct file *file)
 {
+	void *blob;
+
 	call_void_hook(file_free_security, file);
+
+	blob = file->f_security;
+	if (blob) {
+		file->f_security = NULL;
+		kmem_cache_free(lsm_file_cache, blob);
+	}
 }
 
 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
···
 
 int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
 {
-	return call_int_hook(task_alloc, 0, task, clone_flags);
+	int rc = lsm_task_alloc(task);
+
+	if (rc)
+		return rc;
+	rc = call_int_hook(task_alloc, 0, task, clone_flags);
+	if (unlikely(rc))
+		security_task_free(task);
+	return rc;
 }
 
 void security_task_free(struct task_struct *task)
 {
 	call_void_hook(task_free, task);
+
+	kfree(task->security);
+	task->security = NULL;
 }
 
 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
 {
-	return call_int_hook(cred_alloc_blank, 0, cred, gfp);
+	int rc = lsm_cred_alloc(cred, gfp);
+
+	if (rc)
+		return rc;
+
+	rc = call_int_hook(cred_alloc_blank, 0, cred, gfp);
+	if (unlikely(rc))
+		security_cred_free(cred);
+	return rc;
 }
 
 void security_cred_free(struct cred *cred)
 {
 	call_void_hook(cred_free, cred);
+
+	kfree(cred->security);
+	cred->security = NULL;
 }
 
 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
 {
-	return call_int_hook(cred_prepare, 0, new, old, gfp);
+	int rc = lsm_cred_alloc(new, gfp);
+
+	if (rc)
+		return rc;
+
+	rc = call_int_hook(cred_prepare, 0, new, old, gfp);
+	if (unlikely(rc))
+		security_cred_free(new);
+	return rc;
 }
 
 void security_transfer_creds(struct cred *new, const struct cred *old)
···
 
 int security_msg_msg_alloc(struct msg_msg *msg)
 {
-	return call_int_hook(msg_msg_alloc_security, 0, msg);
+	int rc = lsm_msg_msg_alloc(msg);
+
+	if (unlikely(rc))
+		return rc;
+	rc = call_int_hook(msg_msg_alloc_security, 0, msg);
+	if (unlikely(rc))
+		security_msg_msg_free(msg);
+	return rc;
 }
 
 void security_msg_msg_free(struct msg_msg *msg)
 {
 	call_void_hook(msg_msg_free_security, msg);
+	kfree(msg->security);
+	msg->security = NULL;
 }
 
 int security_msg_queue_alloc(struct kern_ipc_perm *msq)
 {
-	return call_int_hook(msg_queue_alloc_security, 0, msq);
+	int rc = lsm_ipc_alloc(msq);
+
+	if (unlikely(rc))
+		return rc;
+	rc = call_int_hook(msg_queue_alloc_security, 0, msq);
+	if (unlikely(rc))
+		security_msg_queue_free(msq);
+	return rc;
 }
 
 void security_msg_queue_free(struct kern_ipc_perm *msq)
 {
 	call_void_hook(msg_queue_free_security, msq);
+	kfree(msq->security);
+	msq->security = NULL;
 }
 
 int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
···
 
 int security_shm_alloc(struct kern_ipc_perm *shp)
 {
-	return call_int_hook(shm_alloc_security, 0, shp);
+	int rc = lsm_ipc_alloc(shp);
+
+	if (unlikely(rc))
+		return rc;
+	rc = call_int_hook(shm_alloc_security, 0, shp);
+	if (unlikely(rc))
+		security_shm_free(shp);
+	return rc;
 }
 
 void security_shm_free(struct kern_ipc_perm *shp)
 {
 	call_void_hook(shm_free_security, shp);
+	kfree(shp->security);
+	shp->security = NULL;
 }
 
 int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
···
 
 int security_sem_alloc(struct kern_ipc_perm *sma)
 {
-	return call_int_hook(sem_alloc_security, 0, sma);
+	int rc = lsm_ipc_alloc(sma);
+
+	if (unlikely(rc))
+		return rc;
+	rc = call_int_hook(sem_alloc_security, 0, sma);
+	if (unlikely(rc))
+		security_sem_free(sma);
+	return rc;
 }
 
 void security_sem_free(struct kern_ipc_perm *sma)
 {
 	call_void_hook(sem_free_security, sma);
+	kfree(sma->security);
+	sma->security = NULL;
 }
 
 int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
···
 }
 EXPORT_SYMBOL(security_d_instantiate);
 
-int security_getprocattr(struct task_struct *p, char *name, char **value)
+int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
+				char **value)
 {
-	return call_int_hook(getprocattr, -EINVAL, p, name, value);
+	struct security_hook_list *hp;
+
+	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
+		if (lsm != NULL && strcmp(lsm, hp->lsm))
+			continue;
+		return hp->hook.getprocattr(p, name, value);
+	}
+	return -EINVAL;
 }
 
-int security_setprocattr(const char *name, void *value, size_t size)
+int security_setprocattr(const char *lsm, const char *name, void *value,
+			 size_t size)
 {
-	return call_int_hook(setprocattr, -EINVAL, name, value, size);
+	struct security_hook_list *hp;
+
+	hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
+		if (lsm != NULL && strcmp(lsm, hp->lsm))
+			continue;
+		return hp->hook.setprocattr(name, value, size);
+	}
+	return -EINVAL;
 }
 
 int security_netlink_send(struct sock *sk, struct sk_buff *skb)

security/selinux/Kconfig

···
 
 	  If you are unsure how to answer this question, answer N.
 
-config SECURITY_SELINUX_BOOTPARAM_VALUE
-	int "NSA SELinux boot parameter default value"
-	depends on SECURITY_SELINUX_BOOTPARAM
-	range 0 1
-	default 1
-	help
-	  This option sets the default value for the kernel parameter
-	  'selinux', which allows SELinux to be disabled at boot.  If this
-	  option is set to 0 (zero), the SELinux kernel parameter will
-	  default to 0, disabling SELinux at bootup.  If this option is
-	  set to 1 (one), the SELinux kernel parameter will default to 1,
-	  enabling SELinux at bootup.
-
-	  If you are unsure how to answer this question, answer 1.
-
 config SECURITY_SELINUX_DISABLE
 	bool "NSA SELinux runtime disable"
 	depends on SECURITY_SELINUX

security/selinux/Makefile

···
 obj-$(CONFIG_SECURITY_SELINUX) := selinux.o
 
 selinux-y := avc.o hooks.o selinuxfs.o netlink.o nlmsgtab.o netif.o \
-	     netnode.o netport.o ibpkey.o exports.o \
+	     netnode.o netport.o ibpkey.o \
 	     ss/ebitmap.o ss/hashtab.o ss/symtab.o ss/sidtab.o ss/avtab.o \
 	     ss/policydb.o ss/services.o ss/conditional.o ss/mls.o ss/status.o
 

security/selinux/exports.c

···
-/*
- * SELinux services exported to the rest of the kernel.
- *
- * Author: James Morris <[e-mail]>
- *
- * Copyright (C) 2005 Red Hat, Inc., James Morris <[e-mail]>
- * Copyright (C) 2006 Trusted Computer Solutions, Inc. <[e-mail]>
- * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2,
- * as published by the Free Software Foundation.
- */
-#include <linux/module.h>
-#include <linux/selinux.h>
-
-#include "security.h"
-
-bool selinux_is_enabled(void)
-{
-	return selinux_enabled;
-}
-EXPORT_SYMBOL_GPL(selinux_is_enabled);

security/selinux/hooks.c

···
 #include <linux/personality.h>
 #include <linux/audit.h>
 #include <linux/string.h>
-#include <linux/selinux.h>
 #include <linux/mutex.h>
 #include <linux/posix-timers.h>
 #include <linux/syslog.h>
···
 #define selinux_enforcing_boot 1
 #endif
 
+int selinux_enabled __lsm_ro_after_init = 1;
 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
-int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
-
 static int __init selinux_enabled_setup(char *str)
 {
 	unsigned long enabled;
···
 	return 1;
 }
 __setup("selinux=", selinux_enabled_setup);
-#else
-int selinux_enabled = 1;
 #endif
 
 static unsigned int selinux_checkreqprot_boot =
···
 	return 1;
 }
 __setup("checkreqprot=", checkreqprot_setup);
-
-static struct kmem_cache *sel_inode_cache;
-static struct kmem_cache *file_security_cache;
 
 /**
  * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
···
 	struct cred *cred = (struct cred *) current->real_cred;
 	struct task_security_struct *tsec;
 
-	tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
-	if (!tsec)
-		panic("SELinux:  Failed to initialize initial task.\n");
-
+	lsm_early_cred(cred);
+	tsec = selinux_cred(cred);
 	tsec->osid = tsec->sid = SECINITSID_KERNEL;
-	cred->security = tsec;
 }
 
 /*
···
 {
 	const struct task_security_struct *tsec;
 
-	tsec = cred->security;
+	tsec = selinux_cred(cred);
 	return tsec->sid;
 }
 
···
 
 static int inode_alloc_security(struct inode *inode)
 {
-	struct inode_security_struct *isec;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	u32 sid = current_sid();
-
-	isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
-	if (!isec)
-		return -ENOMEM;
 
 	spin_lock_init(&isec->lock);
 	INIT_LIST_HEAD(&isec->list);
···
 	isec->sclass = SECCLASS_FILE;
 	isec->task_sid = sid;
 	isec->initialized = LABEL_INVALID;
-	inode->i_security = isec;
 
 	return 0;
 }
···
 				       struct dentry *dentry,
 				       bool may_sleep)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 
 	might_sleep_if(may_sleep);
 
···
 
 static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
 {
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu)
···
 	error = __inode_security_revalidate(inode, NULL, !rcu);
 	if (error)
 		return ERR_PTR(error);
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 /*
···
 static struct inode_security_struct *inode_security(struct inode *inode)
 {
 	__inode_security_revalidate(inode, NULL, true);
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
 {
 	struct inode *inode = d_backing_inode(dentry);
 
-	return inode->i_security;
+	return selinux_inode(inode);
 }
 
 /*
···
 	struct inode *inode = d_backing_inode(dentry);
 
 	__inode_security_revalidate(inode, dentry, true);
-	return inode->i_security;
-}
-
-static void inode_free_rcu(struct rcu_head *head)
-{
-	struct inode_security_struct *isec;
-
-	isec = container_of(head, struct inode_security_struct, rcu);
-	kmem_cache_free(sel_inode_cache, isec);
+	return selinux_inode(inode);
 }
 
 static void inode_free_security(struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
-	struct superblock_security_struct *sbsec = inode->i_sb->s_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
+	struct superblock_security_struct *sbsec;
 
+	if (!isec)
+		return;
+	sbsec = inode->i_sb->s_security;
 	/*
 	 * As not all inode security structures are in a list, we check for
 	 * empty list outside of the lock to make sure that we won't waste
···
 		list_del_init(&isec->list);
 		spin_unlock(&sbsec->isec_lock);
 	}
-
-	/*
-	 * The inode may still be referenced in a path walk and
-	 * a call to selinux_inode_permission() can be made
-	 * after inode_free_security() is called. Ideally, the VFS
-	 * wouldn't do this, but fixing that is a much harder
-	 * job. For now, simply free the i_security via RCU, and
-	 * leave the current inode->i_security pointer intact.
-	 * The inode will be freed after the RCU grace period too.
-	 */
-	call_rcu(&isec->rcu, inode_free_rcu);
 }
 
 static int file_alloc_security(struct file *file)
 {
-	struct file_security_struct *fsec;
+	struct file_security_struct *fsec = selinux_file(file);
 	u32 sid = current_sid();
-
-	fsec = kmem_cache_zalloc(file_security_cache, GFP_KERNEL);
-	if (!fsec)
-		return -ENOMEM;
 
 	fsec->sid = sid;
 	fsec->fown_sid = sid;
-	file->f_security = fsec;
 
 	return 0;
-}
-
-static void file_free_security(struct file *file)
-{
-	struct file_security_struct *fsec = file->f_security;
-	file->f_security = NULL;
-	kmem_cache_free(file_security_cache, fsec);
 }
 
 static int superblock_alloc_security(struct super_block *sb)
···
 			struct superblock_security_struct *sbsec,
 			const struct cred *cred)
 {
-	const struct task_security_struct *tsec = cred->security;
+	const struct task_security_struct *tsec = selinux_cred(cred);
 	int rc;
 
 	rc = avc_has_perm(&selinux_state,
···
 			struct superblock_security_struct *sbsec,
 			const struct cred *cred)
 {
-	const struct task_security_struct *tsec = cred->security;
+	const struct task_security_struct *tsec = selinux_cred(cred);
 	int rc;
 	rc = avc_has_perm(&selinux_state,
 			  tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
···
 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
 {
 	struct superblock_security_struct *sbsec = NULL;
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	u32 task_sid, sid = 0;
 	u16 sclass;
 	struct dentry *dentry;
···
 		return 0;
 
 	sid = cred_sid(cred);
-	isec = inode->i_security;
+	isec = selinux_inode(inode);
 
 	return avc_has_perm(&selinux_state,
 			    sid, isec->sid, isec->sclass, perms, adp);
···
 			 struct file *file,
 			 u32 av)
 {
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct inode *inode = file_inode(file);
 	struct common_audit_data ad;
 	u32 sid = cred_sid(cred);
···
 		      struct dentry *dentry,
 		      u16 tclass)
 {
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 	struct inode_security_struct *dsec;
 	struct superblock_security_struct *sbsec;
 	u32 sid, newsid;
···
 	if (rc)
 		return rc;
 
-	rc = selinux_determine_inode_label(current_security(), dir,
+	rc = selinux_determine_inode_label(selinux_cred(current_cred()), dir,
 					   &dentry->d_name, tclass, &newsid);
 	if (rc)
 		return rc;
···
 					struct file *file)
 {
 	u32 sid = task_sid(to);
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct dentry *dentry = file->f_path.dentry;
 	struct inode_security_struct *isec;
 	struct common_audit_data ad;
···
 	if (bprm->called_set_creds)
 		return 0;
 
-	old_tsec = current_security();
-	new_tsec = bprm->cred->security;
+	old_tsec = selinux_cred(current_cred());
+	new_tsec = selinux_cred(bprm->cred);
 	isec = inode_security(inode);
 
 	/* Default to the current task SID. */
···
 	struct rlimit *rlim, *initrlim;
 	int rc, i;
 
-	new_tsec = bprm->cred->security;
+	new_tsec = selinux_cred(bprm->cred);
 	if (new_tsec->sid == new_tsec->osid)
 		return;
 
···
  */
 static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 {
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 	struct itimerval itimer;
 	u32 osid, sid;
 	int rc, i;
···
 	u32 newsid;
 	int rc;
 
-	rc = selinux_determine_inode_label(current_security(),
+	rc = selinux_determine_inode_label(selinux_cred(current_cred()),
 					   d_inode(dentry->d_parent), name,
 					   inode_mode_to_security_class(mode),
 					   &newsid);
···
 	int rc;
 	struct task_security_struct *tsec;
 
-	rc = selinux_determine_inode_label(old->security,
+	rc = selinux_determine_inode_label(selinux_cred(old),
 					   d_inode(dentry->d_parent), name,
 					   inode_mode_to_security_class(mode),
 					   &newsid);
 	if (rc)
 		return rc;
 
-	tsec = new->security;
+	tsec = selinux_cred(new);
 	tsec->create_sid = newsid;
 	return 0;
 }
···
 				       const char **name,
 				       void **value, size_t *len)
 {
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 	struct superblock_security_struct *sbsec;
 	u32 newsid, clen;
 	int rc;
···
 
 	newsid = tsec->create_sid;
 
-	rc = selinux_determine_inode_label(current_security(),
+	rc = selinux_determine_inode_label(selinux_cred(current_cred()),
 		dir, qstr,
 		inode_mode_to_security_class(inode->i_mode),
 		&newsid);
···
 
 	/* Possibly defer initialization to selinux_complete_init. */
 	if (sbsec->flags & SE_SBINITIALIZED) {
-		struct inode_security_struct *isec = inode->i_security;
+		struct inode_security_struct *isec = selinux_inode(inode);
 		isec->sclass = inode_mode_to_security_class(inode->i_mode);
 		isec->sid = newsid;
 		isec->initialized = LABEL_INITIALIZED;
···
 					   unsigned flags)
 {
 	struct common_audit_data ad;
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	int rc;
 
 	ad.type = LSM_AUDIT_DATA_INODE;
···
 			return -ENOMEM;
 	}
 
-	tsec = new_creds->security;
+	tsec = selinux_cred(new_creds);
 	/* Get label from overlay inode and set it in create_sid */
 	selinux_inode_getsecid(d_inode(src), &sid);
 	tsec->create_sid = sid;
···
 static int selinux_file_permission(struct file *file, int mask)
 {
 	struct inode *inode = file_inode(file);
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct inode_security_struct *isec;
 	u32 sid = current_sid();
 
···
 	return file_alloc_security(file);
 }
 
-static void selinux_file_free_security(struct file *file)
-{
-	file_free_security(file);
-}
-
 /*
  * Check whether a task has the ioctl permission and cmd
  * operation to an inode.
···
 		u32 requested, u16 cmd)
 {
 	struct common_audit_data ad;
-	struct file_security_struct *fsec = file->f_security;
+	struct file_security_struct *fsec = selinux_file(file);
 	struct inode *inode = file_inode(file);
 	struct inode_security_struct *isec;
 	struct lsm_ioctlop_audit ioctl;
···
 {
 	struct file_security_struct *fsec;
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 	fsec->fown_sid = current_sid();
 }
 
···
 	/* struct fown_struct is never outside the context of a struct file */
 	file = container_of(fown, struct file, f_owner);
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 
 	if (!signum)
 		perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
···
 	struct file_security_struct *fsec;
 	struct inode_security_struct *isec;
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 	isec = inode_security(file_inode(file));
 	/*
 	 * Save inode label and policy sequence number
···
 }
 
 /*
- * allocate the SELinux part of blank credentials
- */
-static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp)
-{
-	struct task_security_struct *tsec;
-
-	tsec = kzalloc(sizeof(struct task_security_struct), gfp);
-	if (!tsec)
-		return -ENOMEM;
-
-	cred->security = tsec;
-	return 0;
-}
-
-/*
- * detach and free the LSM part of a set of credentials
- */
-static void selinux_cred_free(struct cred *cred)
-{
-	struct task_security_struct *tsec = cred->security;
-
-	/*
-	 * cred->security == NULL if security_cred_alloc_blank() or
-	 * security_prepare_creds() returned an error.
-	 */
-	BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE);
-	cred->security = (void *) 0x7UL;
-	kfree(tsec);
-}
-
-/*
  * prepare a new set of credentials for modification
  */
 static int selinux_cred_prepare(struct cred *new, const struct cred *old,
 				gfp_t gfp)
 {
-	const struct task_security_struct *old_tsec;
-	struct task_security_struct *tsec;
+	const struct task_security_struct *old_tsec = selinux_cred(old);
+	struct task_security_struct *tsec = selinux_cred(new);
 
-	old_tsec = old->security;
-
-	tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp);
-	if (!tsec)
-		return -ENOMEM;
-
-	new->security = tsec;
+	*tsec = *old_tsec;
 	return 0;
 }
 
···
  */
 static void selinux_cred_transfer(struct cred *new, const struct cred *old)
 {
-	const struct task_security_struct *old_tsec = old->security;
-	struct task_security_struct *tsec = new->security;
+	const struct task_security_struct *old_tsec = selinux_cred(old);
+	struct task_security_struct *tsec = selinux_cred(new);
 
 	*tsec = *old_tsec;
 }
···
  */
 static int selinux_kernel_act_as(struct cred *new, u32 secid)
 {
-	struct task_security_struct *tsec = new->security;
+	struct task_security_struct *tsec = selinux_cred(new);
 	u32 sid = current_sid();
 	int ret;
 
···
 static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
 {
 	struct inode_security_struct *isec = inode_security(inode);
-	struct task_security_struct *tsec = new->security;
+	struct task_security_struct *tsec = selinux_cred(new);
 	u32 sid = current_sid();
 	int ret;
 
···
 	ad.type = LSM_AUDIT_DATA_FILE;
 	ad.u.file = file;
 
-	fsec = file->f_security;
+	fsec = selinux_file(file);
 	if (sid != fsec->sid) {
 		rc = avc_has_perm(&selinux_state,
 				  sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
···
 static void selinux_task_to_inode(struct task_struct *p,
 				  struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 	u32 sid = task_sid(p);
 
 	spin_lock(&isec->lock);
···
 static int selinux_socket_create(int family, int type,
 				 int protocol, int kern)
 {
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 	u32 newsid;
 	u16 secclass;
 	int rc;
···
 static int selinux_socket_post_create(struct socket *sock, int family,
 				      int type, int protocol, int kern)
 {
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 	struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock));
 	struct sk_security_struct *sksec;
 	u16 sclass = socket_type_to_security_class(family, type, protocol);
···
 	const struct task_security_struct *__tsec;
 	u32 tsid;
 
-	__tsec = current_security();
+	__tsec = selinux_cred(current_cred());
 	tsid = __tsec->sid;
 
 	return avc_has_perm(&selinux_state,
···
 	return selinux_nlmsg_perm(sk, skb);
 }
 
-static int ipc_alloc_security(struct kern_ipc_perm *perm,
-			      u16 sclass)
+static void ipc_init_security(struct ipc_security_struct *isec, u16 sclass)
 {
-	struct ipc_security_struct *isec;
-
-	isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
-	if (!isec)
-		return -ENOMEM;
-
 	isec->sclass = sclass;
 	isec->sid = current_sid();
-	perm->security = isec;
-
-	return 0;
-}
-
-static void ipc_free_security(struct kern_ipc_perm *perm)
-{
-	struct ipc_security_struct *isec = perm->security;
-	perm->security = NULL;
-	kfree(isec);
 }
 
 static int msg_msg_alloc_security(struct msg_msg *msg)
 {
 	struct msg_security_struct *msec;
 
-	msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
-	if (!msec)
-		return -ENOMEM;
-
+	msec = selinux_msg_msg(msg);
 	msec->sid = SECINITSID_UNLABELED;
-	msg->security = msec;
 
 	return 0;
-}
-
-static void msg_msg_free_security(struct msg_msg *msg)
-{
-	struct msg_security_struct *msec = msg->security;
-
-	msg->security = NULL;
-	kfree(msec);
 }
 
 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
···
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = ipc_perms->security;
+	isec = selinux_ipc(ipc_perms);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = ipc_perms->key;
···
 	return msg_msg_alloc_security(msg);
 }
 
-static void selinux_msg_msg_free_security(struct msg_msg *msg)
-{
-	msg_msg_free_security(msg);
-}
-
 /* message queue security operations */
 static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq)
 {
···
 	u32 sid = current_sid();
 	int rc;
 
-	rc = ipc_alloc_security(msq, SECCLASS_MSGQ);
-	if (rc)
-		return rc;
-
-	isec = msq->security;
+	isec = selinux_ipc(msq);
+	ipc_init_security(isec, SECCLASS_MSGQ);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = msq->key;
···
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid, SECCLASS_MSGQ,
 			  MSGQ__CREATE, &ad);
-	if (rc) {
-		ipc_free_security(msq);
-		return rc;
-	}
-	return 0;
-}
-
-static void selinux_msg_queue_free_security(struct kern_ipc_perm *msq)
-{
-	ipc_free_security(msq);
+	return rc;
 }
 
 static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
···
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = msq->security;
+	isec = selinux_ipc(msq);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = msq->key;
···
 	u32 sid = current_sid();
 	int rc;
 
-	isec = msq->security;
-	msec = msg->security;
+	isec = selinux_ipc(msq);
+	msec = selinux_msg_msg(msg);
 
 	/*
 	 * First time through, need to assign label to the message
···
 	u32 sid = task_sid(target);
 	int rc;
 
-	isec = msq->security;
-	msec = msg->security;
+	isec = selinux_ipc(msq);
+	msec = selinux_msg_msg(msg);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = msq->key;
···
 	u32 sid = current_sid();
 	int rc;
 
-	rc = ipc_alloc_security(shp, SECCLASS_SHM);
-	if (rc)
-		return rc;
-
-	isec = shp->security;
+	isec = selinux_ipc(shp);
+	ipc_init_security(isec, SECCLASS_SHM);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = shp->key;
···
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid, SECCLASS_SHM,
 			  SHM__CREATE, &ad);
-	if (rc) {
-		ipc_free_security(shp);
-		return rc;
-	}
-	return 0;
-}
-
-static void selinux_shm_free_security(struct kern_ipc_perm *shp)
-{
-	ipc_free_security(shp);
+	return rc;
 }
 
 static int selinux_shm_associate(struct kern_ipc_perm *shp, int shmflg)
···
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = shp->security;
+	isec = selinux_ipc(shp);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = shp->key;
···
 	u32 sid = current_sid();
 	int rc;
 
-	rc = ipc_alloc_security(sma, SECCLASS_SEM);
-	if (rc)
-		return rc;
-
-	isec = sma->security;
+	isec = selinux_ipc(sma);
+	ipc_init_security(isec, SECCLASS_SEM);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = sma->key;
···
 	rc = avc_has_perm(&selinux_state,
 			  sid, isec->sid, SECCLASS_SEM,
 			  SEM__CREATE, &ad);
-	if (rc) {
-		ipc_free_security(sma);
-		return rc;
-	}
-	return 0;
-}
-
-static void selinux_sem_free_security(struct kern_ipc_perm *sma)
-{
-	ipc_free_security(sma);
+	return rc;
 }
 
 static int selinux_sem_associate(struct kern_ipc_perm *sma, int semflg)
···
 	struct common_audit_data ad;
 	u32 sid = current_sid();
 
-	isec = sma->security;
+	isec = selinux_ipc(sma);
 
 	ad.type = LSM_AUDIT_DATA_IPC;
 	ad.u.ipc_id = sma->key;
···
 
 static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
 {
-	struct ipc_security_struct *isec = ipcp->security;
+	struct ipc_security_struct *isec = selinux_ipc(ipcp);
 	*secid = isec->sid;
 }
 
···
 	unsigned len;
 
 	rcu_read_lock();
-	__tsec = __task_cred(p)->security;
+	__tsec = selinux_cred(__task_cred(p));
 
 	if (current != p) {
 		error = avc_has_perm(&selinux_state,
···
 	   operation.  See selinux_bprm_set_creds for the execve
 	   checks and may_create for the file creation checks. The
 	   operation will then fail if the context is not permitted. */
-	tsec = new->security;
+	tsec = selinux_cred(new);
 	if (!strcmp(name, "exec")) {
 		tsec->exec_sid = sid;
 	} else if (!strcmp(name, "fscreate")) {
···
 
 static void selinux_inode_invalidate_secctx(struct inode *inode)
 {
-	struct inode_security_struct *isec = inode->i_security;
+	struct inode_security_struct *isec = selinux_inode(inode);
 
 	spin_lock(&isec->lock);
 	isec->initialized = LABEL_INVALID;
···
 	if (!ksec)
 		return -ENOMEM;
 
-	tsec = cred->security;
+	tsec = selinux_cred(cred);
 	if (tsec->keycreate_sid)
 		ksec->sid = tsec->keycreate_sid;
 	else
···
 }
 #endif
 
+struct lsm_blob_sizes selinux_blob_sizes __lsm_ro_after_init = {
+	.lbs_cred = sizeof(struct task_security_struct),
+	.lbs_file = sizeof(struct file_security_struct),
+	.lbs_inode = sizeof(struct inode_security_struct),
+	.lbs_ipc = sizeof(struct ipc_security_struct),
+	.lbs_msg_msg = sizeof(struct msg_security_struct),
+};
+
 static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(binder_set_context_mgr, selinux_binder_set_context_mgr),
 	LSM_HOOK_INIT(binder_transaction, selinux_binder_transaction),
···
 
 	LSM_HOOK_INIT(file_permission, selinux_file_permission),
 	LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
-	LSM_HOOK_INIT(file_free_security, selinux_file_free_security),
 	LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl),
 	LSM_HOOK_INIT(mmap_file, selinux_mmap_file),
 	LSM_HOOK_INIT(mmap_addr, selinux_mmap_addr),
···
 	LSM_HOOK_INIT(file_open, selinux_file_open),
 
 	LSM_HOOK_INIT(task_alloc, selinux_task_alloc),
-	LSM_HOOK_INIT(cred_alloc_blank, selinux_cred_alloc_blank),
-	LSM_HOOK_INIT(cred_free, selinux_cred_free),
 	LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare),
 	LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer),
 	LSM_HOOK_INIT(cred_getsecid, selinux_cred_getsecid),
···
 	LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid),
 
 	LSM_HOOK_INIT(msg_msg_alloc_security, selinux_msg_msg_alloc_security),
-	LSM_HOOK_INIT(msg_msg_free_security, selinux_msg_msg_free_security),
 
 	LSM_HOOK_INIT(msg_queue_alloc_security,
 			selinux_msg_queue_alloc_security),
-	LSM_HOOK_INIT(msg_queue_free_security, selinux_msg_queue_free_security),
 	LSM_HOOK_INIT(msg_queue_associate, selinux_msg_queue_associate),
 	LSM_HOOK_INIT(msg_queue_msgctl, selinux_msg_queue_msgctl),
 	LSM_HOOK_INIT(msg_queue_msgsnd, selinux_msg_queue_msgsnd),
 	LSM_HOOK_INIT(msg_queue_msgrcv, selinux_msg_queue_msgrcv),
 
 	LSM_HOOK_INIT(shm_alloc_security, selinux_shm_alloc_security),
-	LSM_HOOK_INIT(shm_free_security, selinux_shm_free_security),
 	LSM_HOOK_INIT(shm_associate, selinux_shm_associate),
 	LSM_HOOK_INIT(shm_shmctl, selinux_shm_shmctl),
 	LSM_HOOK_INIT(shm_shmat, selinux_shm_shmat),
 
 	LSM_HOOK_INIT(sem_alloc_security, selinux_sem_alloc_security),
-	LSM_HOOK_INIT(sem_free_security, selinux_sem_free_security),
 	LSM_HOOK_INIT(sem_associate, selinux_sem_associate),
 	LSM_HOOK_INIT(sem_semctl, selinux_sem_semctl),
 	LSM_HOOK_INIT(sem_semop, selinux_sem_semop),
···
 
 static __init int selinux_init(void)
 {
-	if (!security_module_enable("selinux")) {
-		selinux_enabled = 0;
-		return 0;
-	}
-
-	if (!selinux_enabled) {
-		pr_info("SELinux:  Disabled at boot.\n");
-		return 0;
-	}
-
 	pr_info("SELinux:  Initializing.\n");
 
 	memset(&selinux_state, 0, sizeof(selinux_state));
···
 
 	default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);
 
-	sel_inode_cache = kmem_cache_create("selinux_inode_security",
-					    sizeof(struct inode_security_struct),
-					    0, SLAB_PANIC, NULL);
-	file_security_cache = kmem_cache_create("selinux_file_security",
-					    sizeof(struct file_security_struct),
-					    0, SLAB_PANIC, NULL);
 	avc_init();
 
 	avtab_cache_init();
···
    all processes and objects when they are created. */
 DEFINE_LSM(selinux) = {
 	.name = "selinux",
+	.flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
+	.enabled = &selinux_enabled,
+	.blobs = &selinux_blob_sizes,
 	.init = selinux_init,
 };
 

security/selinux/include/audit.h

···
 /*
  * SELinux support for the Audit LSM hooks
  *
- * Most of below header was moved from include/linux/selinux.h which
- * is released under below copyrights:
- *
  * Author: James Morris <[e-mail]>
  *
  * Copyright (C) 2005 Red Hat, Inc., James Morris <[e-mail]>

security/selinux/include/objsec.h

···
 #include <linux/binfmts.h>
 #include <linux/in.h>
 #include <linux/spinlock.h>
+#include <linux/lsm_hooks.h>
+#include <linux/msg.h>
 #include <net/net_namespace.h>
 #include "flask.h"
 #include "avc.h"
···
 
 struct inode_security_struct {
 	struct inode *inode;	/* back pointer to inode object */
-	union {
-		struct list_head list;	/* list of inode_security_struct */
-		struct rcu_head rcu;	/* for freeing the inode_security_struct */
-	};
+	struct list_head list;	/* list of inode_security_struct */
 	u32 task_sid;		/* SID of creating task */
 	u32 sid;		/* SID of this object */
 	u16 sclass;		/* security class of this object */
···
 struct bpf_security_struct {
 	u32 sid;  /*SID of bpf obj creater*/
 };
+
+extern struct lsm_blob_sizes selinux_blob_sizes;
+static inline struct task_security_struct *selinux_cred(const struct cred *cred)
+{
+	return cred->security + selinux_blob_sizes.lbs_cred;
+}
+
+static inline struct file_security_struct *selinux_file(const struct file *file)
+{
+	return file->f_security + selinux_blob_sizes.lbs_file;
+}
+
+static inline struct inode_security_struct *selinux_inode(
+						const struct inode *inode)
+{
+	if (unlikely(!inode->i_security))
+		return NULL;
+	return inode->i_security + selinux_blob_sizes.lbs_inode;
+}
+
+static inline struct msg_security_struct *selinux_msg_msg(
+						const struct msg_msg *msg_msg)
+{
+	return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
+}
+
+static inline struct ipc_security_struct *selinux_ipc(
+						const struct kern_ipc_perm *ipc)
+{
+	return ipc->security + selinux_blob_sizes.lbs_ipc;
+}
 
 #endif /* _SELINUX_OBJSEC_H_ */

security/selinux/selinuxfs.c

···
 			goto out;
 		}
 
-		isec = (struct inode_security_struct *)inode->i_security;
+		isec = selinux_inode(inode);
 		ret = security_genfs_sid(fsi->state, "selinuxfs", page,
 					 SECCLASS_FILE, &sid);
 		if (ret) {
···
 	}
 
 	inode->i_ino = ++fsi->last_ino;
-	isec = (struct inode_security_struct *)inode->i_security;
+	isec = selinux_inode(inode);
 	isec->sid = SECINITSID_DEVNULL;
 	isec->sclass = SECCLASS_CHR_FILE;
 	isec->initialized = LABEL_INITIALIZED;

security/selinux/ss/services.c

···
 #include <linux/sched.h>
 #include <linux/audit.h>
 #include <linux/mutex.h>
-#include <linux/selinux.h>
 #include <linux/flex_array.h>
 #include <linux/vmalloc.h>
 #include <net/netlabel.h>

security/selinux/xfrm.c

···
 				   gfp_t gfp)
 {
 	int rc;
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 	struct xfrm_sec_ctx *ctx = NULL;
 	u32 str_len;
 
···
  */
 static int selinux_xfrm_delete(struct xfrm_sec_ctx *ctx)
 {
-	const struct task_security_struct *tsec = current_security();
+	const struct task_security_struct *tsec = selinux_cred(current_cred());
 
 	if (!ctx)
 		return 0;

security/smack/smack.h

···
 #include <linux/list.h>
 #include <linux/rculist.h>
 #include <linux/lsm_audit.h>
+#include <linux/msg.h>
 
 /*
  * Use IPv6 port labeling if IPv6 is enabled and secmarks
···
 extern struct smack_known *smack_unconfined;
 #endif
 extern int smack_ptrace_rule;
+extern struct lsm_blob_sizes smack_blob_sizes;
 
 extern struct smack_known smack_known_floor;
 extern struct smack_known smack_known_hat;
···
 #define SMACK_HASH_SLOTS 16
 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
 
+static inline struct task_smack *smack_cred(const struct cred *cred)
+{
+	return cred->security + smack_blob_sizes.lbs_cred;
+}
+
+static inline struct smack_known **smack_file(const struct file *file)
+{
+	return (struct smack_known **)(file->f_security +
+				       smack_blob_sizes.lbs_file);
+}
+
+static inline struct inode_smack *smack_inode(const struct inode *inode)
+{
+	return inode->i_security + smack_blob_sizes.lbs_inode;
+}
+
+static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
+{
+	return msg->security + smack_blob_sizes.lbs_msg_msg;
+}
+
+static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
+{
+	return ipc->security + smack_blob_sizes.lbs_ipc;
+}
+
 /*
  * Is the directory transmuting?
  */
 static inline int smk_inode_transmutable(const struct inode *isp)
 {
-	struct inode_smack *sip = isp->i_security;
+	struct inode_smack *sip = smack_inode(isp);
 	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
 }
 
···
  */
 static inline struct smack_known *smk_of_inode(const struct inode *isp)
 {
-	struct inode_smack *sip = isp->i_security;
+	struct inode_smack *sip = smack_inode(isp);
 	return sip->smk_inode;
 }
 
···
 	return tsp->smk_task;
 }
 
-static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
+static inline struct smack_known *smk_of_task_struct(
+						const struct task_struct *t)
 {
 	struct smack_known *skp;
+	const struct cred *cred;
 
 	rcu_read_lock();
-	skp = smk_of_task(__task_cred(t)->security);
+
+	cred = __task_cred(t);
+	skp = smk_of_task(smack_cred(cred));
+
 	rcu_read_unlock();
+
 	return skp;
 }
 
···
  */
 static inline struct smack_known *smk_of_current(void)
 {
-	return smk_of_task(current_security());
+	return smk_of_task(smack_cred(current_cred()));
 }
 
 /*

security/smack/smack_access.c

···
 int smk_curacc(struct smack_known *obj_known,
 	       u32 mode, struct smk_audit_info *a)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_tskacc(tsp, obj_known, mode, a);
 }
···
  */
 bool smack_privileged_cred(int cap, const struct cred *cred)
 {
-	struct task_smack *tsp = cred->security;
+	struct task_smack *tsp = smack_cred(cred);
 	struct smack_known *skp = tsp->smk_task;
 	struct smack_known_list_elem *sklep;
 	int rc;

security/smack/smack_lsm.c

···
 static int smk_bu_current(char *note, struct smack_known *oskp,
 			  int mode, int rc)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 	char acc[SMK_NUM_ACCESS_TYPE + 1];
 
 	if (rc <= 0)
···
 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 static int smk_bu_task(struct task_struct *otp, int mode, int rc)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 	struct smack_known *smk_task = smk_of_task_struct(otp);
 	char acc[SMK_NUM_ACCESS_TYPE + 1];
 
···
 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 static int smk_bu_inode(struct inode *inode, int mode, int rc)
 {
-	struct task_smack *tsp = current_security();
-	struct inode_smack *isp = inode->i_security;
+	struct task_smack *tsp = smack_cred(current_cred());
+	struct inode_smack *isp = smack_inode(inode);
 	char acc[SMK_NUM_ACCESS_TYPE + 1];
 
 	if (isp->smk_flags & SMK_INODE_IMPURE)
···
 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 static int smk_bu_file(struct file *file, int mode, int rc)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 	struct smack_known *sskp = tsp->smk_task;
 	struct inode *inode = file_inode(file);
-	struct inode_smack *isp = inode->i_security;
+	struct inode_smack *isp = smack_inode(inode);
 	char acc[SMK_NUM_ACCESS_TYPE + 1];
 
 	if (isp->smk_flags & SMK_INODE_IMPURE)
···
 static int smk_bu_credfile(const struct cred *cred, struct file *file,
 				int mode, int rc)
 {
-	struct task_smack *tsp = cred->security;
+	struct task_smack *tsp = smack_cred(cred);
 	struct smack_known *sskp = tsp->smk_task;
 	struct inode *inode = file_inode(file);
-	struct inode_smack *isp = inode->i_security;
+	struct inode_smack *isp = smack_inode(inode);
 	char acc[SMK_NUM_ACCESS_TYPE + 1];
 
 	if (isp->smk_flags & SMK_INODE_IMPURE)
···
 }
 
 /**
- * new_inode_smack - allocate an inode security blob
+ * init_inode_smack - initialize an inode security blob
+ * @isp: the blob to initialize
  * @skp: a pointer to the Smack label entry to use in the blob
  *
- * Returns the new blob or NULL if there's no memory available
  */
-static struct inode_smack *new_inode_smack(struct smack_known *skp)
+static void init_inode_smack(struct inode *inode, struct smack_known *skp)
 {
-	struct inode_smack *isp;
-
-	isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
-	if (isp == NULL)
-		return NULL;
+	struct inode_smack *isp = smack_inode(inode);
 
 	isp->smk_inode = skp;
 	isp->smk_flags = 0;
 	mutex_init(&isp->smk_lock);
-
-	return isp;
 }
 
 /**
- * new_task_smack - allocate a task security blob
+ * init_task_smack - initialize a task security blob
+ * @tsp: blob to initialize
  * @task: a pointer to the Smack label for the running task
  * @forked: a pointer to the Smack label for the forked task
- * @gfp: type of the memory for the allocation
  *
- * Returns the new blob or NULL if there's no memory available
  */
-static struct task_smack *new_task_smack(struct smack_known *task,
-					struct smack_known *forked, gfp_t gfp)
+static void init_task_smack(struct task_smack *tsp, struct smack_known *task,
+					struct smack_known *forked)
 {
-	struct task_smack *tsp;
-
-	tsp = kzalloc(sizeof(struct task_smack), gfp);
-	if (tsp == NULL)
-		return NULL;
-
 	tsp->smk_task = task;
 	tsp->smk_forked = forked;
 	INIT_LIST_HEAD(&tsp->smk_rules);
 	INIT_LIST_HEAD(&tsp->smk_relabel);
 	mutex_init(&tsp->smk_rules_lock);
-
-	return tsp;
 }
 
 /**
···
 
 	rcu_read_lock();
 	tracercred = __task_cred(tracer);
-	tsp = tracercred->security;
+	tsp = smack_cred(tracercred);
 	tracer_known = smk_of_task(tsp);
 
 	if ((mode & PTRACE_MODE_ATTACH) &&
···
 	int rc;
 	struct smack_known *skp;
 
-	skp = smk_of_task(current_security());
+	skp = smk_of_task(smack_cred(current_cred()));
 
 	rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
 	return rc;
···
 	if (sp->smk_flags & SMK_SB_INITIALIZED)
 		return 0;
 
+	if (inode->i_security == NULL) {
+		int rc = lsm_inode_alloc(inode);
+
+		if (rc)
+			return rc;
+	}
+
 	if (!smack_privileged(CAP_MAC_ADMIN)) {
 		/*
 		 * Unprivileged mounts don't get to specify Smack values.
···
 	/*
 	 * Initialize the root inode.
 	 */
-	isp = inode->i_security;
-	if (isp == NULL) {
-		isp = new_inode_smack(sp->smk_root);
-		if (isp == NULL)
-			return -ENOMEM;
-		inode->i_security = isp;
-	} else
-		isp->smk_inode = sp->smk_root;
+	init_inode_smack(inode, sp->smk_root);
 
-	if (transmute)
+	if (transmute) {
+		isp = smack_inode(inode);
 		isp->smk_flags |= SMK_INODE_TRANSMUTE;
+	}
 
 	return 0;
 }
···
 static int smack_bprm_set_creds(struct linux_binprm *bprm)
 {
 	struct inode *inode = file_inode(bprm->file);
-	struct task_smack *bsp = bprm->cred->security;
+	struct task_smack *bsp = smack_cred(bprm->cred);
 	struct inode_smack *isp;
 	struct superblock_smack *sbsp;
 	int rc;
···
 	if (bprm->called_set_creds)
 		return 0;
 
-	isp = inode->i_security;
+	isp = smack_inode(inode);
 	if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
 		return 0;
 
···
 {
 	struct smack_known *skp = smk_of_current();
 
-	inode->i_security = new_inode_smack(skp);
-	if (inode->i_security == NULL)
-		return -ENOMEM;
+	init_inode_smack(inode, skp);
 	return 0;
-}
-
-/**
- * smack_inode_free_rcu - Free inode_smack blob from cache
- * @head: the rcu_head for getting inode_smack pointer
- *
- *  Call back function called from call_rcu() to free
- *  the i_security blob pointer in inode
- */
-static void smack_inode_free_rcu(struct rcu_head *head)
-{
-	struct inode_smack *issp;
-
-	issp = container_of(head, struct inode_smack, smk_rcu);
-	kmem_cache_free(smack_inode_cache, issp);
-}
-
-/**
- * smack_inode_free_security - free an inode blob using call_rcu()
- * @inode: the inode with a blob
- *
- * Clears the blob pointer in inode using RCU
- */
-static void smack_inode_free_security(struct inode *inode)
-{
-	struct inode_smack *issp = inode->i_security;
-
-	/*
-	 * The inode may still be referenced in a path walk and
-	 * a call to smack_inode_permission() can be made
-	 * after smack_inode_free_security() is called.
-	 * To avoid race condition free the i_security via RCU
-	 * and leave the current inode->i_security pointer intact.
-	 * The inode will be freed after the RCU grace period too.
-	 */
-	call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
 }
 
 /**
···
 				     const struct qstr *qstr, const char **name,
 				     void **value, size_t *len)
 {
-	struct inode_smack *issp = inode->i_security;
+	struct inode_smack *issp = smack_inode(inode);
 	struct smack_known *skp = smk_of_current();
 	struct smack_known *isp = smk_of_inode(inode);
 	struct smack_known *dsp = smk_of_inode(dir);
···
 				      const void *value, size_t size, int flags)
 {
 	struct smack_known *skp;
-	struct inode_smack *isp = d_backing_inode(dentry)->i_security;
+	struct inode_smack *isp = smack_inode(d_backing_inode(dentry));
 
 	if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
 		isp->smk_flags |= SMK_INODE_TRANSMUTE;
···
 	if (rc != 0)
 		return rc;
 
-	isp = d_backing_inode(dentry)->i_security;
+	isp = smack_inode(d_backing_inode(dentry));
 	/*
 	 * Don't do anything special for these.
 	 *	XATTR_NAME_SMACKIPIN
···
  */
 static int smack_file_alloc_security(struct file *file)
 {
-	struct smack_known *skp = smk_of_current();
+	struct smack_known **blob = smack_file(file);
 
-	file->f_security = skp;
+	*blob = smk_of_current();
 	return 0;
-}
-
-/**
- * smack_file_free_security - clear a file security blob
- * @file: the object
- *
- * The security blob for a file is a pointer to the master
- * label list, so no memory is freed.
- */
-static void smack_file_free_security(struct file *file)
-{
-	file->f_security = NULL;
 }
 
 /**
···
 	if (unlikely(IS_PRIVATE(file_inode(file))))
 		return 0;
 
-	isp = file_inode(file)->i_security;
+	isp = smack_inode(file_inode(file));
 	if (isp->smk_mmap == NULL)
 		return 0;
 	sbsp = file_inode(file)->i_sb->s_security;
···
 		return -EACCES;
 	mkp = isp->smk_mmap;
 
-	tsp = current_security();
+	tsp = smack_cred(current_cred());
 	skp = smk_of_current();
 	rc = 0;
 
···
  */
 static void smack_file_set_fowner(struct file *file)
 {
-	file->f_security = smk_of_current();
+	struct smack_known **blob = smack_file(file);
+
+	*blob = smk_of_current();
 }
 
 /**
···
 static int smack_file_send_sigiotask(struct task_struct *tsk,
 				     struct fown_struct *fown, int signum)
 {
+	struct smack_known **blob;
 	struct smack_known *skp;
-	struct smack_known *tkp = smk_of_task(tsk->cred->security);
+	struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred));
 	const struct cred *tcred;
 	struct file *file;
 	int rc;
···
 	file = container_of(fown, struct file, f_owner);
 
 	/* we don't log here as rc can be overriden */
-	skp = file->f_security;
+	blob = smack_file(file);
+	skp = *blob;
 	rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
 	rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);
 
···
 	if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
 		sock = SOCKET_I(inode);
 		ssp = sock->sk->sk_security;
-		tsp = current_security();
+		tsp = smack_cred(current_cred());
 		/*
 		 * If the receiving process can't write to the
 		 * passed socket or if the passed socket can't
···
  */
 static int smack_file_open(struct file *file)
 {
-	struct task_smack *tsp = file->f_cred->security;
+	struct task_smack *tsp = smack_cred(file->f_cred);
 	struct inode *inode = file_inode(file);
 	struct smk_audit_info ad;
 	int rc;
···
  */
 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
 {
-	struct task_smack *tsp;
-
-	tsp = new_task_smack(NULL, NULL, gfp);
-	if (tsp == NULL)
-		return -ENOMEM;
-
-	cred->security = tsp;
-
+	init_task_smack(smack_cred(cred), NULL, NULL);
 	return 0;
 }
 
···
  */
 static void smack_cred_free(struct cred *cred)
 {
-	struct task_smack *tsp = cred->security;
+	struct task_smack *tsp = smack_cred(cred);
 	struct smack_rule *rp;
 	struct list_head *l;
 	struct list_head *n;
-
-	if (tsp == NULL)
-		return;
-	cred->security = NULL;
 
 	smk_destroy_label_list(&tsp->smk_relabel);
 
···
 		list_del(&rp->list);
 		kfree(rp);
 	}
-	kfree(tsp);
 }
 
 /**
···
 static int smack_cred_prepare(struct cred *new, const struct cred *old,
 			      gfp_t gfp)
 {
-	struct task_smack *old_tsp = old->security;
-	struct task_smack *new_tsp;
+	struct task_smack *old_tsp = smack_cred(old);
+	struct task_smack *new_tsp = smack_cred(new);
 	int rc;
 
-	new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
-	if (new_tsp == NULL)
-		return -ENOMEM;
-
-	new->security = new_tsp;
+	init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task);
 
 	rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
 	if (rc != 0)
···
 
 	rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
 				gfp);
-	if (rc != 0)
-		return rc;
-
-	return 0;
+	return rc;
 }
 
 /**
···
  */
 static void smack_cred_transfer(struct cred *new, const struct cred *old)
 {
-	struct task_smack *old_tsp = old->security;
-	struct task_smack *new_tsp = new->security;
+	struct task_smack *old_tsp = smack_cred(old);
+	struct task_smack *new_tsp = smack_cred(new);
 
 	new_tsp->smk_task = old_tsp->smk_task;
 	new_tsp->smk_forked = old_tsp->smk_task;
 	mutex_init(&new_tsp->smk_rules_lock);
 	INIT_LIST_HEAD(&new_tsp->smk_rules);
-
 
 	/* cbs copy rule list */
 }
···
  *
  * Sets the secid to contain a u32 version of the smack label.
  */
-static void smack_cred_getsecid(const struct cred *c, u32 *secid)
+static void smack_cred_getsecid(const struct cred *cred, u32 *secid)
 {
 	struct smack_known *skp;
 
 	rcu_read_lock();
-	skp = smk_of_task(c->security);
+	skp = smk_of_task(smack_cred(cred));
 	*secid = skp->smk_secid;
 	rcu_read_unlock();
 }
···
  */
 static int smack_kernel_act_as(struct cred *new, u32 secid)
 {
-	struct task_smack *new_tsp = new->security;
+	struct task_smack *new_tsp = smack_cred(new);
 
 	new_tsp->smk_task = smack_from_secid(secid);
 	return 0;
···
 static int smack_kernel_create_files_as(struct cred *new,
 					struct inode *inode)
 {
-	struct inode_smack *isp = inode->i_security;
-	struct task_smack *tsp = new->security;
+	struct inode_smack *isp = smack_inode(inode);
+	struct task_smack *tsp = smack_cred(new);
 
 	tsp->smk_forked = isp->smk_inode;
 	tsp->smk_task = tsp->smk_forked;
···
 	 * specific behavior. This is not clean. For one thing
 	 * we can't take privilege into account.
 	 */
-	skp = smk_of_task(cred->security);
+	skp = smk_of_task(smack_cred(cred));
 	rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
 	rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
 	return rc;
···
  */
 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
 {
-	struct inode_smack *isp = inode->i_security;
+	struct inode_smack *isp = smack_inode(inode);
 	struct smack_known *skp = smk_of_task_struct(p);
 
 	isp->smk_inode = skp;
···
 				   const void *value, size_t size, int flags)
 {
 	struct smack_known *skp;
-	struct inode_smack *nsp = inode->i_security;
+	struct inode_smack *nsp = smack_inode(inode);
 	struct socket_smack *ssp;
 	struct socket *sock;
 	int rc = 0;
···
  */
 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
 {
-	struct smack_known *skp = smk_of_current();
+	struct smack_known **blob = smack_msg_msg(msg);
 
-	msg->security = skp;
+	*blob = smk_of_current();
 	return 0;
-}
-
-/**
- * smack_msg_msg_free_security - Clear the security blob for msg_msg
- * @msg: the object
- *
- * Clears the blob pointer
- */
-static void smack_msg_msg_free_security(struct msg_msg *msg)
-{
-	msg->security = NULL;
 }
 
 /**
···
  */
 static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
 {
-	return (struct smack_known *)isp->security;
+	struct smack_known **blob = smack_ipc(isp);
+
+	return *blob;
 }
 
 /**
···
  */
 static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
 {
-	struct smack_known *skp = smk_of_current();
+	struct smack_known **blob = smack_ipc(isp);
 
-	isp->security = skp;
+	*blob = smk_of_current();
 	return 0;
-}
-
-/**
- * smack_ipc_free_security - Clear the security blob for ipc
- * @isp: the object
- *
- * Clears the blob pointer
- */
-static void smack_ipc_free_security(struct kern_ipc_perm *isp)
-{
-	isp->security = NULL;
 }
 
 /**
···
  */
 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
 {
-	struct smack_known *iskp = ipp->security;
+	struct smack_known **blob = smack_ipc(ipp);
+	struct smack_known *iskp = *blob;
 	int may = smack_flags_to_may(flag);
 	struct smk_audit_info ad;
 	int rc;
···
  */
 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
 {
-	struct smack_known *iskp = ipp->security;
+	struct smack_known **blob = smack_ipc(ipp);
+	struct smack_known *iskp = *blob;
 
 	*secid = iskp->smk_secid;
 }
···
 	if (inode == NULL)
 		return;
 
-	isp = inode->i_security;
+	isp = smack_inode(inode);
 
 	mutex_lock(&isp->smk_lock);
 	/*
···
  */
 static int smack_setprocattr(const char *name, void *value, size_t size)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 	struct cred *new;
 	struct smack_known *skp;
 	struct smack_known_list_elem *sklep;
···
 	if (new == NULL)
 		return -ENOMEM;
 
-	tsp = new->security;
+	tsp = smack_cred(new);
 	tsp->smk_task = skp;
 	/*
 	 * process can change its label only once
···
 static int smack_key_alloc(struct key *key, const struct cred *cred,
 			   unsigned long flags)
 {
-	struct smack_known *skp = smk_of_task(cred->security);
+	struct smack_known *skp = smk_of_task(smack_cred(cred));
 
 	key->security = skp;
 	return 0;
···
 {
 	struct key *keyp;
 	struct smk_audit_info ad;
-	struct smack_known *tkp = smk_of_task(cred->security);
+	struct smack_known *tkp = smk_of_task(smack_cred(cred));
 	int request = 0;
 	int rc;
 
···
 			return -ENOMEM;
 	}
 
-	tsp = new_creds->security;
+	tsp = smack_cred(new_creds);
 
 	/*
 	 * Get label from overlay inode and set it in create_sid
 	 */
-	isp = d_inode(dentry->d_parent)->i_security;
+	isp = smack_inode(d_inode(dentry->d_parent));
 	skp = isp->smk_inode;
 	tsp->smk_task = skp;
 	*new = new_creds;
···
 					const struct cred *old,
 					struct cred *new)
 {
-	struct task_smack *otsp = old->security;
-	struct task_smack *ntsp = new->security;
+	struct task_smack *otsp = smack_cred(old);
+	struct task_smack *ntsp = smack_cred(new);
 	struct inode_smack *isp;
 	int may;
 
···
 	/*
 	 * the attribute of the containing directory
 	 */
-	isp = d_inode(dentry->d_parent)->i_security;
+	isp = smack_inode(d_inode(dentry->d_parent));
 
 	if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
 		rcu_read_lock();
···
 	return 0;
 }
 
+struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
+	.lbs_cred = sizeof(struct task_smack),
+	.lbs_file = sizeof(struct smack_known *),
+	.lbs_inode = sizeof(struct inode_smack),
+	.lbs_ipc = sizeof(struct smack_known *),
+	.lbs_msg_msg = sizeof(struct smack_known *),
+};
+
 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),
···
 	LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds),
 
 	LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security),
-	LSM_HOOK_INIT(inode_free_security, smack_inode_free_security),
 	LSM_HOOK_INIT(inode_init_security, smack_inode_init_security),
 	LSM_HOOK_INIT(inode_link, smack_inode_link),
 	LSM_HOOK_INIT(inode_unlink, smack_inode_unlink),
···
 	LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
 
 	LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
-	LSM_HOOK_INIT(file_free_security, smack_file_free_security),
 	LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
 	LSM_HOOK_INIT(file_lock, smack_file_lock),
 	LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),
···
 	LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid),
 
 	LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security),
-	LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security),
 
 	LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security),
-	LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security),
 	LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate),
 	LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl),
 	LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd),
 	LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv),
 
 	LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security),
-	LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security),
 	LSM_HOOK_INIT(shm_associate, smack_shm_associate),
 	LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl),
 	LSM_HOOK_INIT(shm_shmat, smack_shm_shmat),
 
 	LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security),
-	LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security),
 	LSM_HOOK_INIT(sem_associate, smack_sem_associate),
 	LSM_HOOK_INIT(sem_semctl, smack_sem_semctl),
 	LSM_HOOK_INIT(sem_semop, smack_sem_semop),
···
  */
 static __init int smack_init(void)
 {
-	struct cred *cred;
+	struct cred *cred = (struct cred *) current->cred;
 	struct task_smack *tsp;
-
-	if (!security_module_enable("smack"))
-		return 0;
 
 	smack_inode_cache = KMEM_CACHE(inode_smack, 0);
 	if (!smack_inode_cache)
 		return -ENOMEM;
 
-	tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
-				GFP_KERNEL);
-	if (tsp == NULL) {
-		kmem_cache_destroy(smack_inode_cache);
-		return -ENOMEM;
-	}
+	lsm_early_cred(cred);
 
+	/*
+	 * Set the security state for the initial task.
+	 */
+	tsp = smack_cred(cred);
+	init_task_smack(tsp, &smack_known_floor, &smack_known_floor);
+
+	/*
+	 * Register with LSM
+	 */
+	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
 	smack_enabled = 1;
 
 	pr_info("Smack:  Initializing.\n");
···
 	pr_info("Smack:  IPv6 Netfilter enabled.\n");
 #endif
 
-	/*
-	 * Set the security state for the initial task.
-	 */
-	cred = (struct cred *) current->cred;
-	cred->security = tsp;
-
 	/* initialize the smack_known_list */
 	init_smack_known_list();
-
-	/*
-	 * Register with LSM
-	 */
-	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
 
 	return 0;
 }
···
  */
 DEFINE_LSM(smack) = {
 	.name = "smack",
+	.flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
+	.blobs = &smack_blob_sizes,
 	.init = smack_init,
 };

security/smack/smackfs.c

···
 
 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_seq_start(s, pos, &tsp->smk_rules);
 }
 
 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_seq_next(s, v, pos, &tsp->smk_rules);
 }
···
 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
 			      size_t count, loff_t *ppos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
 				    &tsp->smk_rules_lock, SMK_FIXED24_FMT);
···
 
 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_seq_start(s, pos, &tsp->smk_rules);
 }
 
 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_seq_next(s, v, pos, &tsp->smk_rules);
 }
···
 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
 			      size_t count, loff_t *ppos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
 				    &tsp->smk_rules_lock, SMK_LONG_FMT);
···
 
 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_seq_start(s, pos, &tsp->smk_relabel);
 }
 
 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 
 	return smk_seq_next(s, v, pos, &tsp->smk_relabel);
 }
···
 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
 				size_t count, loff_t *ppos)
 {
-	struct task_smack *tsp = current_security();
+	struct task_smack *tsp = smack_cred(current_cred());
 	char *data;
 	int rc;
 	LIST_HEAD(list_tmp);

security/tomoyo/common.h

···
 #include <linux/in.h>
 #include <linux/in6.h>
 #include <linux/un.h>
+#include <linux/lsm_hooks.h>
 #include <net/sock.h>
 #include <net/af_unix.h>
 #include <net/ip.h>
···
 /********** External variable definitions. **********/
 
 extern bool tomoyo_policy_loaded;
+extern int tomoyo_enabled;
 extern const char * const tomoyo_condition_keyword
 [TOMOYO_MAX_CONDITION_KEYWORD];
 extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
···
 extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
 extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
 extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
+extern struct lsm_blob_sizes tomoyo_blob_sizes;
 
 /********** Inlined functions. **********/
 
···
 }
 
 /**
+ * tomoyo_cred - Get a pointer to the tomoyo cred security blob
+ * @cred - the relevant cred
+ *
+ * Returns pointer to the tomoyo cred blob.
+ */
+static inline struct tomoyo_domain_info **tomoyo_cred(const struct cred *cred)
+{
+	return cred->security + tomoyo_blob_sizes.lbs_cred;
+}
+
+/**
  * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
  *
  * Returns pointer to "struct tomoyo_domain_info" for current thread.
  */
 static inline struct tomoyo_domain_info *tomoyo_domain(void)
 {
-	return current_cred()->security;
+	struct tomoyo_domain_info **blob = tomoyo_cred(current_cred());
+
+	return *blob;
 }
 
 /**
···
 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
 							    *task)
 {
-	return task_cred_xxx(task, security);
+	struct tomoyo_domain_info **blob = tomoyo_cred(get_task_cred(task));
+
+	return *blob;
 }
 
 /**

security/tomoyo/domain.c

···
  */
 int tomoyo_find_next_domain(struct linux_binprm *bprm)
 {
+	struct tomoyo_domain_info **blob;
 	struct tomoyo_domain_info *old_domain = tomoyo_domain();
 	struct tomoyo_domain_info *domain = NULL;
 	const char *original_name = bprm->filename;
···
 		domain = old_domain;
 	/* Update reference count on "struct tomoyo_domain_info". */
 	atomic_inc(&domain->users);
-	bprm->cred->security = domain;
+	blob = tomoyo_cred(bprm->cred);
+	*blob = domain;
 	kfree(exename.name);
 	if (!retval) {
 		ee->r.domain = domain;

security/tomoyo/securityfs_if.c

···
 				if (!cred) {
 					error = -ENOMEM;
 				} else {
-					struct tomoyo_domain_info *old_domain =
-						cred->security;
-					cred->security = new_domain;
+					struct tomoyo_domain_info **blob;
+					struct tomoyo_domain_info *old_domain;
+
+					blob = tomoyo_cred(cred);
+					old_domain = *blob;
+					*blob = new_domain;
 					atomic_inc(&new_domain->users);
 					atomic_dec(&old_domain->users);
 					commit_creds(cred);
···
  */
 static int __init tomoyo_initerface_init(void)
 {
+	struct tomoyo_domain_info *domain;
 	struct dentry *tomoyo_dir;
 
+	if (!tomoyo_enabled)
+		return 0;
+	domain = tomoyo_domain();
 	/* Don't create securityfs entries unless registered. */
-	if (current_cred()->security != &tomoyo_kernel_domain)
+	if (domain != &tomoyo_kernel_domain)
 		return 0;
 
 	tomoyo_dir = securityfs_create_dir("tomoyo", NULL);

security/tomoyo/tomoyo.c

···
  */
 static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
 {
-	new->security = NULL;
+	struct tomoyo_domain_info **blob = tomoyo_cred(new);
+
+	*blob = NULL;
 	return 0;
 }
 
···
 static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
 			       gfp_t gfp)
 {
-	struct tomoyo_domain_info *domain = old->security;
-	new->security = domain;
+	struct tomoyo_domain_info **old_blob = tomoyo_cred(old);
+	struct tomoyo_domain_info **new_blob = tomoyo_cred(new);
+	struct tomoyo_domain_info *domain;
+
+	domain = *old_blob;
+	*new_blob = domain;
+
 	if (domain)
 		atomic_inc(&domain->users);
 	return 0;
···
  */
 static void tomoyo_cred_free(struct cred *cred)
 {
-	struct tomoyo_domain_info *domain = cred->security;
+	struct tomoyo_domain_info **blob = tomoyo_cred(cred);
+	struct tomoyo_domain_info *domain = *blob;
+
 	if (domain)
 		atomic_dec(&domain->users);
 }
···
  */
 static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
 {
+	struct tomoyo_domain_info **blob;
+	struct tomoyo_domain_info *domain;
+
 	/*
 	 * Do only if this function is called for the first time of an execve
 	 * operation.
···
 	 * stored inside "bprm->cred->security" will be acquired later inside
 	 * tomoyo_find_next_domain().
 	 */
-	atomic_dec(&((struct tomoyo_domain_info *)
-		     bprm->cred->security)->users);
+	blob = tomoyo_cred(bprm->cred);
+	domain = *blob;
+	atomic_dec(&domain->users);
 	/*
 	 * Tell tomoyo_bprm_check_security() is called for the first time of an
 	 * execve operation.
 	 */
-	bprm->cred->security = NULL;
+	*blob = NULL;
 	return 0;
 }
 
···
  */
 static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
 {
-	struct tomoyo_domain_info *domain = bprm->cred->security;
+	struct tomoyo_domain_info **blob;
+	struct tomoyo_domain_info *domain;
 
+	blob = tomoyo_cred(bprm->cred);
+	domain = *blob;
 	/*
 	 * Execute permission is checked against pathname passed to do_execve()
 	 * using current domain.
···
 	return tomoyo_socket_sendmsg_permission(sock, msg, size);
 }
 
+struct lsm_blob_sizes tomoyo_blob_sizes __lsm_ro_after_init = {
+	.lbs_cred = sizeof(struct tomoyo_domain_info *),
+};
+
 /*
  * tomoyo_security_ops is a "struct security_operations" which is used for
  * registering TOMOYO.
···
 /* Lock for GC. */
 DEFINE_SRCU(tomoyo_ss);
 
+int tomoyo_enabled __lsm_ro_after_init = 1;
+
 /**
  * tomoyo_init - Register TOMOYO Linux as a LSM module.
  *
···
 static int __init tomoyo_init(void)
 {
 	struct cred *cred = (struct cred *) current_cred();
+	struct tomoyo_domain_info **blob;
 
-	if (!security_module_enable("tomoyo"))
-		return 0;
 	/* register ourselves with the security framework */
 	security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
 	printk(KERN_INFO "TOMOYO Linux initialized\n");
-	cred->security = &tomoyo_kernel_domain;
+	lsm_early_cred(cred);
+	blob = tomoyo_cred(cred);
+	*blob = &tomoyo_kernel_domain;
 	tomoyo_mm_init();
+
 	return 0;
 }
 
 DEFINE_LSM(tomoyo) = {
 	.name = "tomoyo",
+	.enabled = &tomoyo_enabled,
+	.flags = LSM_FLAG_LEGACY_MAJOR,
+	.blobs = &tomoyo_blob_sizes,
 	.init = tomoyo_init,
 };

security/yama/yama_lsm.c

···
 static inline void yama_init_sysctl(void) { }
 #endif /* CONFIG_SYSCTL */
 
-void __init yama_add_hooks(void)
+static int __init yama_init(void)
 {
 	pr_info("Yama: becoming mindful.\n");
 	security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), "yama");
 	yama_init_sysctl();
+	return 0;
 }
+
+DEFINE_LSM(yama) = {
+	.name = "yama",
+	.init = yama_init,
+};