[mirror_ubuntu-jammy-kernel.git] / security / security.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Security plug functions
 *
 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
 * Copyright (C) 2016 Mellanox Technologies
 */

#define pr_fmt(fmt) "LSM: " fmt

#include <linux/bpf.h>
#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kernel_read_file.h>
#include <linux/lsm_hooks.h>
#include <linux/integrity.h>
#include <linux/ima.h>
#include <linux/evm.h>
#include <linux/fsnotify.h>
#include <linux/mman.h>
#include <linux/mount.h>
#include <linux/personality.h>
#include <linux/backing-dev.h>
#include <linux/string.h>
#include <linux/msg.h>
#include <net/flow.h>
#include <net/sock.h>

#define MAX_LSM_EVM_XATTR	2

/* How many LSMs were built into the kernel? */
#define LSM_COUNT (__end_lsm_info - __start_lsm_info)

/*
 * These are descriptions of the reasons that can be passed to the
 * security_locked_down() LSM hook. Placing this array here allows
 * all security modules to use the same descriptions for auditing
 * purposes.
 */
const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = {
	[LOCKDOWN_NONE] = "none",
	[LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
	[LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
	[LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
	[LOCKDOWN_KEXEC] = "kexec of unsigned images",
	[LOCKDOWN_HIBERNATION] = "hibernation",
	[LOCKDOWN_PCI_ACCESS] = "direct PCI access",
	[LOCKDOWN_IOPORT] = "raw io port access",
	[LOCKDOWN_MSR] = "raw MSR access",
	[LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
	[LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
	[LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
	[LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
	[LOCKDOWN_MMIOTRACE] = "unsafe mmio",
	[LOCKDOWN_DEBUGFS] = "debugfs access",
	[LOCKDOWN_XMON_WR] = "xmon write access",
	[LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
	[LOCKDOWN_INTEGRITY_MAX] = "integrity",
	[LOCKDOWN_KCORE] = "/proc/kcore access",
	[LOCKDOWN_KPROBES] = "use of kprobes",
	[LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
	[LOCKDOWN_PERF] = "unsafe use of perf",
	[LOCKDOWN_TRACEFS] = "use of tracefs",
	[LOCKDOWN_XMON_RW] = "xmon read and write access",
	[LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
	[LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
};

struct security_hook_heads security_hook_heads __lsm_ro_after_init;
static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);

static struct kmem_cache *lsm_file_cache;
static struct kmem_cache *lsm_inode_cache;

char *lsm_names;

/*
 * The task blob includes the "display" slot used for
 * chosing which module presents contexts.
 */
static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init = {
	.lbs_task = sizeof(int),
};

/* Boot-time LSM user choice */
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(...)						\
	do {							\
		if (debug)					\
			pr_info(__VA_ARGS__);			\
	} while (0)

static bool __init is_enabled(struct lsm_info *lsm)
{
	if (!lsm->enabled)
		return false;

	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_superblock, &blob_sizes.lbs_superblock);
	lsm_set_blob_size(&needed->lbs_sock, &blob_sizes.lbs_sock);
	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 lsm_early_cred(struct cred *cred);
static void __init lsm_early_task(struct task_struct *task);

static int lsm_append(const char *new, char **result);

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) {
		if (chosen_major_lsm) {
			pr_info("security= is ignored because it is superseded by lsm=\n");
			chosen_major_lsm = NULL;
		}
		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("superblock blob size = %d\n", blob_sizes.lbs_superblock);
	init_debug("sock blob size       = %d\n", blob_sizes.lbs_sock);
	init_debug("task blob size       = %d\n", blob_sizes.lbs_task);
	init_debug("lsmblob size       = %zu\n", sizeof(struct lsmblob));

	/*
	 * 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);

	lsm_early_cred((struct cred *) current->cred);
	lsm_early_task(current);
	for (lsm = ordered_lsms; *lsm; lsm++)
		initialize_lsm(*lsm);

	kfree(ordered_lsms);
}

int __init early_security_init(void)
{
	int i;
	struct hlist_head *list = (struct hlist_head *) &security_hook_heads;
	struct lsm_info *lsm;

	for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct hlist_head);
	     i++)
		INIT_HLIST_HEAD(&list[i]);

	for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
		if (!lsm->enabled)
			lsm->enabled = &lsm_enabled_true;
		prepare_lsm(lsm);
		initialize_lsm(lsm);
	}

	return 0;
}

/**
 * security_init - initializes the security framework
 *
 * This should be called early in the kernel initialization sequence.
 */
int __init security_init(void)
{
	struct lsm_info *lsm;

	pr_info("Security Framework initializing\n");

	/*
	 * Append the names of the early LSM modules now that kmalloc() is
	 * available
	 */
	for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
		if (lsm->enabled)
			lsm_append(lsm->name, &lsm_names);
	}

	/* Load LSMs in specified order. */
	ordered_lsm_init();

	return 0;
}

/* Save user chosen LSM */
static int __init choose_major_lsm(char *str)
{
	chosen_major_lsm = str;
	return 1;
}
__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)
{
	debug = true;
	return 1;
}
__setup("lsm.debug", enable_debug);

static bool match_last_lsm(const char *list, const char *lsm)
{
	const char *last;

	if (WARN_ON(!list || !lsm))
		return false;
	last = strrchr(list, ',');
	if (last)
		/* Pass the comma, strcmp() will check for '\0' */
		last++;
	else
		last = list;
	return !strcmp(last, lsm);
}

static int lsm_append(const char *new, char **result)
{
	char *cp;

	if (*result == NULL) {
		*result = kstrdup(new, GFP_KERNEL);
		if (*result == NULL)
			return -ENOMEM;
	} else {
		/* Check if it is the last registered name */
		if (match_last_lsm(*result, new))
			return 0;
		cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
		if (cp == NULL)
			return -ENOMEM;
		kfree(*result);
		*result = cp;
	}
	return 0;
}

/*
 * Current index to use while initializing the lsmblob secid list.
 * Pointers to the LSM id structures for local use.
 */
static int lsm_slot __lsm_ro_after_init;
static struct lsm_id *lsm_slotlist[LSMBLOB_ENTRIES] __lsm_ro_after_init;

/**
 * security_lsm_slot_name - Get the name of the security module in a slot
 * @slot: index into the "display" slot list.
 *
 * Provide the name of the security module associated with
 * a display slot.
 *
 * If @slot is LSMBLOB_INVALID return the value
 * for slot 0 if it has been set, otherwise NULL.
 *
 * Returns a pointer to the name string or NULL.
 */
const char *security_lsm_slot_name(int slot)
{
	if (slot == LSMBLOB_INVALID)
		slot = 0;
	else if (slot >= LSMBLOB_ENTRIES || slot < 0)
		return NULL;

	if (lsm_slotlist[slot] == NULL)
		return NULL;
	return lsm_slotlist[slot]->lsm;
}

/**
 * security_add_hooks - Add a modules hooks to the hook lists.
 * @hooks: the hooks to add
 * @count: the number of hooks to add
 * @lsmid: the the identification information for the security module
 *
 * Each LSM has to register its hooks with the infrastructure.
 * If the LSM is using hooks that export secids allocate a slot
 * for it in the lsmblob.
 */
void __init security_add_hooks(struct security_hook_list *hooks, int count,
			       struct lsm_id *lsmid)
{
	int i;

	if (lsmid->slot == LSMBLOB_NEEDED) {
		if (lsm_slot >= LSMBLOB_ENTRIES)
			panic("%s Too many LSMs registered.\n", __func__);
		lsm_slotlist[lsm_slot] = lsmid;
		lsmid->slot = lsm_slot++;
		init_debug("%s assigned lsmblob slot %d\n", lsmid->lsm,
			   lsmid->slot);
	}

	for (i = 0; i < count; i++) {
		hooks[i].lsmid = lsmid;
		hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
	}

	/*
	 * Don't try to append during early_security_init(), we'll come back
	 * and fix this up afterwards.
	 */
	if (slab_is_available()) {
		if (lsm_append(lsmid->lsm, &lsm_names) < 0)
			panic("%s - Cannot get early memory.\n", __func__);
	}
}

int call_blocking_lsm_notifier(enum lsm_event event, void *data)
{
	return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
					    event, data);
}
EXPORT_SYMBOL(call_blocking_lsm_notifier);

int register_blocking_lsm_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
						nb);
}
EXPORT_SYMBOL(register_blocking_lsm_notifier);

int unregister_blocking_lsm_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
						  nb);
}
EXPORT_SYMBOL(unregister_blocking_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
 */
static void __init lsm_early_cred(struct cred *cred)
{
	int 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.
 */
static int lsm_task_alloc(struct task_struct *task)
{
	int *display;

	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;

	/*
	 * The start of the task blob contains the "display" LSM slot number.
	 * Start with it set to the invalid slot number, indicating that the
	 * default first registered LSM be displayed.
	 */
	display = task->security;
	*display = LSMBLOB_INVALID;

	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.
 */
static 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.
 */
static 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_sock_alloc - allocate a composite sock blob
 * @sock: the sock that needs a blob
 * @priority: allocation mode
 *
 * Allocate the sock blob for all the modules
 *
 * Returns 0, or -ENOMEM if memory can't be allocated.
 */
static int lsm_sock_alloc(struct sock *sock, gfp_t priority)
{
	if (blob_sizes.lbs_sock == 0) {
		sock->sk_security = NULL;
		return 0;
	}

	sock->sk_security = kzalloc(blob_sizes.lbs_sock, priority);
	if (sock->sk_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
 */
static void __init lsm_early_task(struct task_struct *task)
{
	int rc = lsm_task_alloc(task);

	if (rc)
		panic("%s: Early task alloc failed.\n", __func__);
}

/**
 * append_ctx - append a lsm/context pair to a compound context
 * @ctx: the existing compound context
 * @ctxlen: size of the old context, including terminating nul byte
 * @lsm: new lsm name, nul terminated
 * @new: new context, possibly nul terminated
 * @newlen: maximum size of @new
 *
 * replace @ctx with a new compound context, appending @newlsm and @new
 * to @ctx. On exit the new data replaces the old, which is freed.
 * @ctxlen is set to the new size, which includes a trailing nul byte.
 *
 * Returns 0 on success, -ENOMEM if no memory is available.
 */
static int append_ctx(char **ctx, int *ctxlen, const char *lsm, char *new,
		      int newlen)
{
	char *final;
	size_t llen;
	size_t nlen;
	size_t flen;

	llen = strlen(lsm) + 1;
	/*
	 * A security module may or may not provide a trailing nul on
	 * when returning a security context. There is no definition
	 * of which it should be, and there are modules that do it
	 * each way.
	 */
	nlen = strnlen(new, newlen);

	flen = *ctxlen + llen + nlen + 1;
	final = kzalloc(flen, GFP_KERNEL);

	if (final == NULL)
		return -ENOMEM;

	if (*ctxlen)
		memcpy(final, *ctx, *ctxlen);

	memcpy(final + *ctxlen, lsm, llen);
	memcpy(final + *ctxlen + llen, new, nlen);

	kfree(*ctx);

	*ctx = final;
	*ctxlen = flen;

	return 0;
}

/**
 * lsm_superblock_alloc - allocate a composite superblock blob
 * @sb: the superblock that needs a blob
 *
 * Allocate the superblock blob for all the modules
 *
 * Returns 0, or -ENOMEM if memory can't be allocated.
 */
static int lsm_superblock_alloc(struct super_block *sb)
{
	if (blob_sizes.lbs_superblock == 0) {
		sb->s_security = NULL;
		return 0;
	}

	sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
	if (sb->s_security == NULL)
		return -ENOMEM;
	return 0;
}

/*
 * The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
 * can be accessed with:
 *
 *	LSM_RET_DEFAULT(<hook_name>)
 *
 * The macros below define static constants for the default value of each
 * LSM hook.
 */
#define LSM_RET_DEFAULT(NAME) (NAME##_default)
#define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
#define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
	static const int LSM_RET_DEFAULT(NAME) = (DEFAULT);
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
	DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)

#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK

/*
 * Hook list operation macros.
 *
 * call_void_hook:
 *	This is a hook that does not return a value.
 *
 * call_int_hook:
 *	This is a hook that returns a value.
 */

#define call_void_hook(FUNC, ...)				\
	do {							\
		struct security_hook_list *P;			\
								\
		hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
			P->hook.FUNC(__VA_ARGS__);		\
	} while (0)

#define call_int_hook(FUNC, IRC, ...) ({			\
	int RC = IRC;						\
	do {							\
		struct security_hook_list *P;			\
								\
		hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
			RC = P->hook.FUNC(__VA_ARGS__);		\
			if (RC != 0)				\
				break;				\
		}						\
	} while (0);						\
	RC;							\
})

/* Security operations */

int security_binder_set_context_mgr(struct task_struct *mgr)
{
	return call_int_hook(binder_set_context_mgr, 0, mgr);
}
EXPORT_SYMBOL(security_binder_set_context_mgr);

/**
 * security_binder_transaction - Binder driver transaction check
 * @from: source of the transaction
 * @to: destination of the transaction
 *
 * Verify that the tasks have the same LSM "display", then
 * call the security module hooks.
 *
 * Returns -EINVAL if the displays don't match, or the
 * result of the security module checks.
 */
int security_binder_transaction(struct task_struct *from,
				struct task_struct *to)
{
	int from_display = lsm_task_display(from);
	int to_display = lsm_task_display(to);

	/*
	 * If the display is LSMBLOB_INVALID the first module that has
	 * an entry is used. This will be in the 0 slot.
	 *
	 * This is currently only required if the server has requested
	 * peer contexts, but it would be unwieldly to have too much of
	 * the binder driver detail here.
	 */
	if (from_display == LSMBLOB_INVALID)
		from_display = 0;
	if (to_display == LSMBLOB_INVALID)
		to_display = 0;
	if (from_display != to_display)
		return -EINVAL;

	return call_int_hook(binder_transaction, 0, from, to);
}
EXPORT_SYMBOL(security_binder_transaction);

int security_binder_transfer_binder(struct task_struct *from,
				    struct task_struct *to)
{
	return call_int_hook(binder_transfer_binder, 0, from, to);
}
EXPORT_SYMBOL(security_binder_transfer_binder);

int security_binder_transfer_file(struct task_struct *from,
				  struct task_struct *to, struct file *file)
{
	return call_int_hook(binder_transfer_file, 0, from, to, file);
}
EXPORT_SYMBOL(security_binder_transfer_file);

int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
{
	return call_int_hook(ptrace_access_check, 0, child, mode);
}

int security_ptrace_traceme(struct task_struct *parent)
{
	return call_int_hook(ptrace_traceme, 0, parent);
}

int security_capget(struct task_struct *target,
		     kernel_cap_t *effective,
		     kernel_cap_t *inheritable,
		     kernel_cap_t *permitted)
{
	return call_int_hook(capget, 0, target,
				effective, inheritable, permitted);
}

int security_capset(struct cred *new, const struct cred *old,
		    const kernel_cap_t *effective,
		    const kernel_cap_t *inheritable,
		    const kernel_cap_t *permitted)
{
	return call_int_hook(capset, 0, new, old,
				effective, inheritable, permitted);
}

int security_capable(const struct cred *cred,
		     struct user_namespace *ns,
		     int cap,
		     unsigned int opts)
{
	return call_int_hook(capable, 0, cred, ns, cap, opts);
}

int security_quotactl(int cmds, int type, int id, struct super_block *sb)
{
	return call_int_hook(quotactl, 0, cmds, type, id, sb);
}

int security_quota_on(struct dentry *dentry)
{
	return call_int_hook(quota_on, 0, dentry);
}

int security_syslog(int type)
{
	return call_int_hook(syslog, 0, type);
}

int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
{
	return call_int_hook(settime, 0, ts, tz);
}

int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
{
	struct security_hook_list *hp;
	int cap_sys_admin = 1;
	int rc;

	/*
	 * The module will respond with a positive value if
	 * it thinks the __vm_enough_memory() call should be
	 * made with the cap_sys_admin set. If all of the modules
	 * agree that it should be set it will. If any module
	 * thinks it should not be set it won't.
	 */
	hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
		rc = hp->hook.vm_enough_memory(mm, pages);
		if (rc <= 0) {
			cap_sys_admin = 0;
			break;
		}
	}
	return __vm_enough_memory(mm, pages, cap_sys_admin);
}

int security_bprm_creds_for_exec(struct linux_binprm *bprm)
{
	return call_int_hook(bprm_creds_for_exec, 0, bprm);
}

int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file)
{
	return call_int_hook(bprm_creds_from_file, 0, bprm, file);
}

int security_bprm_check(struct linux_binprm *bprm)
{
	int ret;

	ret = call_int_hook(bprm_check_security, 0, bprm);
	if (ret)
		return ret;
	return ima_bprm_check(bprm);
}

void security_bprm_committing_creds(struct linux_binprm *bprm)
{
	call_void_hook(bprm_committing_creds, bprm);
}

void security_bprm_committed_creds(struct linux_binprm *bprm)
{
	call_void_hook(bprm_committed_creds, bprm);
}

int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
{
	return call_int_hook(fs_context_dup, 0, fc, src_fc);
}

int security_fs_context_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
	return call_int_hook(fs_context_parse_param, -ENOPARAM, fc, param);
}

int security_sb_alloc(struct super_block *sb)
{
	int rc = lsm_superblock_alloc(sb);

	if (unlikely(rc))
		return rc;
	rc = call_int_hook(sb_alloc_security, 0, sb);
	if (unlikely(rc))
		security_sb_free(sb);
	return rc;
}

void security_sb_delete(struct super_block *sb)
{
	call_void_hook(sb_delete, sb);
}

void security_sb_free(struct super_block *sb)
{
	call_void_hook(sb_free_security, sb);
	kfree(sb->s_security);
	sb->s_security = NULL;
}

void security_free_mnt_opts(void **mnt_opts)
{
	if (!*mnt_opts)
		return;
	call_void_hook(sb_free_mnt_opts, *mnt_opts);
	*mnt_opts = NULL;
}
EXPORT_SYMBOL(security_free_mnt_opts);

int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
	return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts);
}
EXPORT_SYMBOL(security_sb_eat_lsm_opts);

int security_sb_mnt_opts_compat(struct super_block *sb,
				void *mnt_opts)
{
	return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts);
}
EXPORT_SYMBOL(security_sb_mnt_opts_compat);

int security_sb_remount(struct super_block *sb,
			void *mnt_opts)
{
	return call_int_hook(sb_remount, 0, sb, mnt_opts);
}
EXPORT_SYMBOL(security_sb_remount);

int security_sb_kern_mount(struct super_block *sb)
{
	return call_int_hook(sb_kern_mount, 0, sb);
}

int security_sb_show_options(struct seq_file *m, struct super_block *sb)
{
	return call_int_hook(sb_show_options, 0, m, sb);
}

int security_sb_statfs(struct dentry *dentry)
{
	return call_int_hook(sb_statfs, 0, dentry);
}

int security_sb_mount(const char *dev_name, const struct path *path,
                       const char *type, unsigned long flags, void *data)
{
	return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data);
}

int security_sb_umount(struct vfsmount *mnt, int flags)
{
	return call_int_hook(sb_umount, 0, mnt, flags);
}

int security_sb_pivotroot(const struct path *old_path, const struct path *new_path)
{
	return call_int_hook(sb_pivotroot, 0, old_path, new_path);
}

int security_sb_set_mnt_opts(struct super_block *sb,
				void *mnt_opts,
				unsigned long kern_flags,
				unsigned long *set_kern_flags)
{
	return call_int_hook(sb_set_mnt_opts,
				mnt_opts ? -EOPNOTSUPP : 0, sb,
				mnt_opts, kern_flags, set_kern_flags);
}
EXPORT_SYMBOL(security_sb_set_mnt_opts);

int security_sb_clone_mnt_opts(const struct super_block *oldsb,
				struct super_block *newsb,
				unsigned long kern_flags,
				unsigned long *set_kern_flags)
{
	return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb,
				kern_flags, set_kern_flags);
}
EXPORT_SYMBOL(security_sb_clone_mnt_opts);

int security_add_mnt_opt(const char *option, const char *val, int len,
			 void **mnt_opts)
{
	return call_int_hook(sb_add_mnt_opt, -EINVAL,
					option, val, len, mnt_opts);
}
EXPORT_SYMBOL(security_add_mnt_opt);

int security_move_mount(const struct path *from_path, const struct path *to_path)
{
	return call_int_hook(move_mount, 0, from_path, to_path);
}

int security_path_notify(const struct path *path, u64 mask,
				unsigned int obj_type)
{
	return call_int_hook(path_notify, 0, path, mask, obj_type);
}

int security_inode_alloc(struct inode *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,
					const struct qstr *name, void **ctx,
					u32 *ctxlen)
{
	return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode,
				name, ctx, ctxlen);
}
EXPORT_SYMBOL(security_dentry_init_security);

int security_dentry_create_files_as(struct dentry *dentry, int mode,
				    struct qstr *name,
				    const struct cred *old, struct cred *new)
{
	return call_int_hook(dentry_create_files_as, 0, dentry, mode,
				name, old, new);
}
EXPORT_SYMBOL(security_dentry_create_files_as);

int security_inode_init_security(struct inode *inode, struct inode *dir,
				 const struct qstr *qstr,
				 const initxattrs initxattrs, void *fs_data)
{
	struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
	struct xattr *lsm_xattr, *evm_xattr, *xattr;
	int ret;

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	if (!initxattrs)
		return call_int_hook(inode_init_security, -EOPNOTSUPP, inode,
				     dir, qstr, NULL, NULL, NULL);
	memset(new_xattrs, 0, sizeof(new_xattrs));
	lsm_xattr = new_xattrs;
	ret = call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, qstr,
						&lsm_xattr->name,
						&lsm_xattr->value,
						&lsm_xattr->value_len);
	if (ret)
		goto out;

	evm_xattr = lsm_xattr + 1;
	ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
	if (ret)
		goto out;
	ret = initxattrs(inode, new_xattrs, fs_data);
out:
	for (xattr = new_xattrs; xattr->value != NULL; xattr++)
		kfree(xattr->value);
	return (ret == -EOPNOTSUPP) ? 0 : ret;
}
EXPORT_SYMBOL(security_inode_init_security);

int security_inode_init_security_anon(struct inode *inode,
				      const struct qstr *name,
				      const struct inode *context_inode)
{
	return call_int_hook(inode_init_security_anon, 0, inode, name,
			     context_inode);
}

int security_old_inode_init_security(struct inode *inode, struct inode *dir,
				     const struct qstr *qstr, const char **name,
				     void **value, size_t *len)
{
	if (unlikely(IS_PRIVATE(inode)))
		return -EOPNOTSUPP;
	return call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir,
			     qstr, name, value, len);
}
EXPORT_SYMBOL(security_old_inode_init_security);

#ifdef CONFIG_SECURITY_PATH
int security_path_mknod(const struct path *dir, struct dentry *dentry, umode_t mode,
			unsigned int dev)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
		return 0;
	return call_int_hook(path_mknod, 0, dir, dentry, mode, dev);
}
EXPORT_SYMBOL(security_path_mknod);

int security_path_mkdir(const struct path *dir, struct dentry *dentry, umode_t mode)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
		return 0;
	return call_int_hook(path_mkdir, 0, dir, dentry, mode);
}
EXPORT_SYMBOL(security_path_mkdir);

int security_path_rmdir(const struct path *dir, struct dentry *dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
		return 0;
	return call_int_hook(path_rmdir, 0, dir, dentry);
}

int security_path_unlink(const struct path *dir, struct dentry *dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
		return 0;
	return call_int_hook(path_unlink, 0, dir, dentry);
}
EXPORT_SYMBOL(security_path_unlink);

int security_path_symlink(const struct path *dir, struct dentry *dentry,
			  const char *old_name)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
		return 0;
	return call_int_hook(path_symlink, 0, dir, dentry, old_name);
}

int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
		       struct dentry *new_dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
		return 0;
	return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
}

int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
			 const struct path *new_dir, struct dentry *new_dentry,
			 unsigned int flags)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
		     (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry)))))
		return 0;

	if (flags & RENAME_EXCHANGE) {
		int err = call_int_hook(path_rename, 0, new_dir, new_dentry,
					old_dir, old_dentry);
		if (err)
			return err;
	}

	return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
				new_dentry);
}
EXPORT_SYMBOL(security_path_rename);

int security_path_truncate(const struct path *path)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
		return 0;
	return call_int_hook(path_truncate, 0, path);
}

int security_path_chmod(const struct path *path, umode_t mode)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
		return 0;
	return call_int_hook(path_chmod, 0, path, mode);
}

int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
		return 0;
	return call_int_hook(path_chown, 0, path, uid, gid);
}

int security_path_chroot(const struct path *path)
{
	return call_int_hook(path_chroot, 0, path);
}
#endif

int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
	return call_int_hook(inode_create, 0, dir, dentry, mode);
}
EXPORT_SYMBOL_GPL(security_inode_create);

int security_inode_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *new_dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
		return 0;
	return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry);
}

int security_inode_unlink(struct inode *dir, struct dentry *dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	return call_int_hook(inode_unlink, 0, dir, dentry);
}

int security_inode_symlink(struct inode *dir, struct dentry *dentry,
			    const char *old_name)
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
	return call_int_hook(inode_symlink, 0, dir, dentry, old_name);
}

int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
	return call_int_hook(inode_mkdir, 0, dir, dentry, mode);
}
EXPORT_SYMBOL_GPL(security_inode_mkdir);

int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	return call_int_hook(inode_rmdir, 0, dir, dentry);
}

int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
{
	if (unlikely(IS_PRIVATE(dir)))
		return 0;
	return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev);
}

int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
			   struct inode *new_dir, struct dentry *new_dentry,
			   unsigned int flags)
{
        if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
            (d_is_positive(new_dentry) && IS_PRIVATE(d_backing_inode(new_dentry)))))
		return 0;

	if (flags & RENAME_EXCHANGE) {
		int err = call_int_hook(inode_rename, 0, new_dir, new_dentry,
						     old_dir, old_dentry);
		if (err)
			return err;
	}

	return call_int_hook(inode_rename, 0, old_dir, old_dentry,
					   new_dir, new_dentry);
}

int security_inode_readlink(struct dentry *dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	return call_int_hook(inode_readlink, 0, dentry);
}

int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
			       bool rcu)
{
	if (unlikely(IS_PRIVATE(inode)))
		return 0;
	return call_int_hook(inode_follow_link, 0, dentry, inode, rcu);
}

int security_inode_permission(struct inode *inode, int mask)
{
	if (unlikely(IS_PRIVATE(inode)))
		return 0;
	return call_int_hook(inode_permission, 0, inode, mask);
}

int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
{
	int ret;

	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	ret = call_int_hook(inode_setattr, 0, dentry, attr);
	if (ret)
		return ret;
	return evm_inode_setattr(dentry, attr);
}
EXPORT_SYMBOL_GPL(security_inode_setattr);

int security_inode_getattr(const struct path *path)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
		return 0;
	return call_int_hook(inode_getattr, 0, path);
}

int security_inode_setxattr(struct user_namespace *mnt_userns,
			    struct dentry *dentry, const char *name,
			    const void *value, size_t size, int flags)
{
	int ret;

	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	/*
	 * SELinux and Smack integrate the cap call,
	 * so assume that all LSMs supplying this call do so.
	 */
	ret = call_int_hook(inode_setxattr, 1, mnt_userns, dentry, name, value,
			    size, flags);

	if (ret == 1)
		ret = cap_inode_setxattr(dentry, name, value, size, flags);
	if (ret)
		return ret;
	ret = ima_inode_setxattr(dentry, name, value, size);
	if (ret)
		return ret;
	return evm_inode_setxattr(mnt_userns, dentry, name, value, size);
}

void security_inode_post_setxattr(struct dentry *dentry, const char *name,
				  const void *value, size_t size, int flags)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return;
	call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
	evm_inode_post_setxattr(dentry, name, value, size);
}

int security_inode_getxattr(struct dentry *dentry, const char *name)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	return call_int_hook(inode_getxattr, 0, dentry, name);
}

int security_inode_listxattr(struct dentry *dentry)
{
	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	return call_int_hook(inode_listxattr, 0, dentry);
}

int security_inode_removexattr(struct user_namespace *mnt_userns,
			       struct dentry *dentry, const char *name)
{
	int ret;

	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;
	/*
	 * SELinux and Smack integrate the cap call,
	 * so assume that all LSMs supplying this call do so.
	 */
	ret = call_int_hook(inode_removexattr, 1, mnt_userns, dentry, name);
	if (ret == 1)
		ret = cap_inode_removexattr(mnt_userns, dentry, name);
	if (ret)
		return ret;
	ret = ima_inode_removexattr(dentry, name);
	if (ret)
		return ret;
	return evm_inode_removexattr(mnt_userns, dentry, name);
}

int security_inode_need_killpriv(struct dentry *dentry)
{
	return call_int_hook(inode_need_killpriv, 0, dentry);
}

int security_inode_killpriv(struct user_namespace *mnt_userns,
			    struct dentry *dentry)
{
	return call_int_hook(inode_killpriv, 0, mnt_userns, dentry);
}

int security_inode_getsecurity(struct user_namespace *mnt_userns,
			       struct inode *inode, const char *name,
			       void **buffer, bool alloc)
{
	struct security_hook_list *hp;
	int rc;

	if (unlikely(IS_PRIVATE(inode)))
		return LSM_RET_DEFAULT(inode_getsecurity);
	/*
	 * Only one module will provide an attribute with a given name.
	 */
	hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
		rc = hp->hook.inode_getsecurity(mnt_userns, inode, name, buffer, alloc);
		if (rc != LSM_RET_DEFAULT(inode_getsecurity))
			return rc;
	}
	return LSM_RET_DEFAULT(inode_getsecurity);
}

int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
{
	struct security_hook_list *hp;
	int rc;

	if (unlikely(IS_PRIVATE(inode)))
		return LSM_RET_DEFAULT(inode_setsecurity);
	/*
	 * Only one module will provide an attribute with a given name.
	 */
	hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
		rc = hp->hook.inode_setsecurity(inode, name, value, size,
								flags);
		if (rc != LSM_RET_DEFAULT(inode_setsecurity))
			return rc;
	}
	return LSM_RET_DEFAULT(inode_setsecurity);
}

int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
{
	if (unlikely(IS_PRIVATE(inode)))
		return 0;
	return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
}
EXPORT_SYMBOL(security_inode_listsecurity);

void security_inode_getsecid(struct inode *inode, struct lsmblob *blob)
{
	struct security_hook_list *hp;

	lsmblob_init(blob, 0);
	hlist_for_each_entry(hp, &security_hook_heads.inode_getsecid, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		hp->hook.inode_getsecid(inode, &blob->secid[hp->lsmid->slot]);
	}
}

int security_inode_copy_up(struct dentry *src, struct cred **new)
{
	return call_int_hook(inode_copy_up, 0, src, new);
}
EXPORT_SYMBOL(security_inode_copy_up);

int security_inode_copy_up_xattr(const char *name)
{
	struct security_hook_list *hp;
	int rc;

	/*
	 * The implementation can return 0 (accept the xattr), 1 (discard the
	 * xattr), -EOPNOTSUPP if it does not know anything about the xattr or
	 * any other error code incase of an error.
	 */
	hlist_for_each_entry(hp,
		&security_hook_heads.inode_copy_up_xattr, list) {
		rc = hp->hook.inode_copy_up_xattr(name);
		if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
			return rc;
	}

	return LSM_RET_DEFAULT(inode_copy_up_xattr);
}
EXPORT_SYMBOL(security_inode_copy_up_xattr);

int security_kernfs_init_security(struct kernfs_node *kn_dir,
				  struct kernfs_node *kn)
{
	return call_int_hook(kernfs_init_security, 0, kn_dir, kn);
}

int security_file_permission(struct file *file, int mask)
{
	int ret;

	ret = call_int_hook(file_permission, 0, file, mask);
	if (ret)
		return ret;

	return fsnotify_perm(file, mask);
}

int security_file_alloc(struct file *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)
{
	return call_int_hook(file_ioctl, 0, file, cmd, arg);
}
EXPORT_SYMBOL_GPL(security_file_ioctl);

static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
{
	/*
	 * Does we have PROT_READ and does the application expect
	 * it to imply PROT_EXEC?  If not, nothing to talk about...
	 */
	if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
		return prot;
	if (!(current->personality & READ_IMPLIES_EXEC))
		return prot;
	/*
	 * if that's an anonymous mapping, let it.
	 */
	if (!file)
		return prot | PROT_EXEC;
	/*
	 * ditto if it's not on noexec mount, except that on !MMU we need
	 * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
	 */
	if (!path_noexec(&file->f_path)) {
#ifndef CONFIG_MMU
		if (file->f_op->mmap_capabilities) {
			unsigned caps = file->f_op->mmap_capabilities(file);
			if (!(caps & NOMMU_MAP_EXEC))
				return prot;
		}
#endif
		return prot | PROT_EXEC;
	}
	/* anything on noexec mount won't get PROT_EXEC */
	return prot;
}

int security_mmap_file(struct file *file, unsigned long prot,
			unsigned long flags)
{
	int ret;
	ret = call_int_hook(mmap_file, 0, file, prot,
					mmap_prot(file, prot), flags);
	if (ret)
		return ret;
	return ima_file_mmap(file, prot);
}

int security_mmap_addr(unsigned long addr)
{
	return call_int_hook(mmap_addr, 0, addr);
}

int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
			    unsigned long prot)
{
	int ret;

	ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot);
	if (ret)
		return ret;
	return ima_file_mprotect(vma, prot);
}

int security_file_lock(struct file *file, unsigned int cmd)
{
	return call_int_hook(file_lock, 0, file, cmd);
}

int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{
	return call_int_hook(file_fcntl, 0, file, cmd, arg);
}

void security_file_set_fowner(struct file *file)
{
	call_void_hook(file_set_fowner, file);
}

int security_file_send_sigiotask(struct task_struct *tsk,
				  struct fown_struct *fown, int sig)
{
	return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig);
}

int security_file_receive(struct file *file)
{
	return call_int_hook(file_receive, 0, file);
}

int security_file_open(struct file *file)
{
	int ret;

	ret = call_int_hook(file_open, 0, file);
	if (ret)
		return ret;

	return fsnotify_perm(file, MAY_OPEN);
}

int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
{
	int *odisplay = current->security;
	int *ndisplay;
	int rc = lsm_task_alloc(task);

	if (unlikely(rc))
		return rc;

	rc = call_int_hook(task_alloc, 0, task, clone_flags);
	if (unlikely(rc)) {
		security_task_free(task);
		return rc;
	}

	if (odisplay) {
		ndisplay = task->security;
		if (ndisplay)
			*ndisplay = *odisplay;
	}

	return 0;
}

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)
{
	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)
{
	/*
	 * There is a failure case in prepare_creds() that
	 * may result in a call here with ->security being NULL.
	 */
	if (unlikely(cred->security == NULL))
		return;

	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)
{
	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)
{
	call_void_hook(cred_transfer, new, old);
}

void security_cred_getsecid(const struct cred *c, struct lsmblob *blob)
{
	struct security_hook_list *hp;

	lsmblob_init(blob, 0);
	hlist_for_each_entry(hp, &security_hook_heads.cred_getsecid, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		hp->hook.cred_getsecid(c, &blob->secid[hp->lsmid->slot]);
	}
}
EXPORT_SYMBOL(security_cred_getsecid);

int security_kernel_act_as(struct cred *new, struct lsmblob *blob)
{
	struct security_hook_list *hp;
	int rc;

	hlist_for_each_entry(hp, &security_hook_heads.kernel_act_as, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		rc = hp->hook.kernel_act_as(new, blob->secid[hp->lsmid->slot]);
		if (rc != 0)
			return rc;
	}
	return 0;
}

int security_kernel_create_files_as(struct cred *new, struct inode *inode)
{
	return call_int_hook(kernel_create_files_as, 0, new, inode);
}

int security_kernel_module_request(char *kmod_name)
{
	int ret;

	ret = call_int_hook(kernel_module_request, 0, kmod_name);
	if (ret)
		return ret;
	return integrity_kernel_module_request(kmod_name);
}

int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
			      bool contents)
{
	int ret;

	ret = call_int_hook(kernel_read_file, 0, file, id, contents);
	if (ret)
		return ret;
	return ima_read_file(file, id, contents);
}
EXPORT_SYMBOL_GPL(security_kernel_read_file);

int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
				   enum kernel_read_file_id id)
{
	int ret;

	ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id);
	if (ret)
		return ret;
	return ima_post_read_file(file, buf, size, id);
}
EXPORT_SYMBOL_GPL(security_kernel_post_read_file);

int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
{
	int ret;

	ret = call_int_hook(kernel_load_data, 0, id, contents);
	if (ret)
		return ret;
	return ima_load_data(id, contents);
}
EXPORT_SYMBOL_GPL(security_kernel_load_data);

int security_kernel_post_load_data(char *buf, loff_t size,
				   enum kernel_load_data_id id,
				   char *description)
{
	int ret;

	ret = call_int_hook(kernel_post_load_data, 0, buf, size, id,
			    description);
	if (ret)
		return ret;
	return ima_post_load_data(buf, size, id, description);
}
EXPORT_SYMBOL_GPL(security_kernel_post_load_data);

int security_task_fix_setuid(struct cred *new, const struct cred *old,
			     int flags)
{
	return call_int_hook(task_fix_setuid, 0, new, old, flags);
}

int security_task_fix_setgid(struct cred *new, const struct cred *old,
				 int flags)
{
	return call_int_hook(task_fix_setgid, 0, new, old, flags);
}

int security_task_setpgid(struct task_struct *p, pid_t pgid)
{
	return call_int_hook(task_setpgid, 0, p, pgid);
}

int security_task_getpgid(struct task_struct *p)
{
	return call_int_hook(task_getpgid, 0, p);
}

int security_task_getsid(struct task_struct *p)
{
	return call_int_hook(task_getsid, 0, p);
}

void security_task_getsecid_subj(struct task_struct *p, struct lsmblob *blob)
{
	struct security_hook_list *hp;

	lsmblob_init(blob, 0);
	hlist_for_each_entry(hp, &security_hook_heads.task_getsecid_subj, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		hp->hook.task_getsecid_subj(p, &blob->secid[hp->lsmid->slot]);
	}
}
EXPORT_SYMBOL(security_task_getsecid_subj);

void security_task_getsecid_obj(struct task_struct *p, struct lsmblob *blob)
{
	struct security_hook_list *hp;

	lsmblob_init(blob, 0);
	hlist_for_each_entry(hp, &security_hook_heads.task_getsecid_obj, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		hp->hook.task_getsecid_obj(p, &blob->secid[hp->lsmid->slot]);
	}
}
EXPORT_SYMBOL(security_task_getsecid_obj);

int security_task_setnice(struct task_struct *p, int nice)
{
	return call_int_hook(task_setnice, 0, p, nice);
}

int security_task_setioprio(struct task_struct *p, int ioprio)
{
	return call_int_hook(task_setioprio, 0, p, ioprio);
}

int security_task_getioprio(struct task_struct *p)
{
	return call_int_hook(task_getioprio, 0, p);
}

int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
			  unsigned int flags)
{
	return call_int_hook(task_prlimit, 0, cred, tcred, flags);
}

int security_task_setrlimit(struct task_struct *p, unsigned int resource,
		struct rlimit *new_rlim)
{
	return call_int_hook(task_setrlimit, 0, p, resource, new_rlim);
}

int security_task_setscheduler(struct task_struct *p)
{
	return call_int_hook(task_setscheduler, 0, p);
}

int security_task_getscheduler(struct task_struct *p)
{
	return call_int_hook(task_getscheduler, 0, p);
}

int security_task_movememory(struct task_struct *p)
{
	return call_int_hook(task_movememory, 0, p);
}

int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
			int sig, const struct cred *cred)
{
	return call_int_hook(task_kill, 0, p, info, sig, cred);
}

int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
			 unsigned long arg4, unsigned long arg5)
{
	int thisrc;
	int rc = LSM_RET_DEFAULT(task_prctl);
	struct security_hook_list *hp;

	hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
		thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
		if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
			rc = thisrc;
			if (thisrc != 0)
				break;
		}
	}
	return rc;
}

void security_task_to_inode(struct task_struct *p, struct inode *inode)
{
	call_void_hook(task_to_inode, p, inode);
}

int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
{
	return call_int_hook(ipc_permission, 0, ipcp, flag);
}

void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob)
{
	struct security_hook_list *hp;

	lsmblob_init(blob, 0);
	hlist_for_each_entry(hp, &security_hook_heads.ipc_getsecid, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		hp->hook.ipc_getsecid(ipcp, &blob->secid[hp->lsmid->slot]);
	}
}

int security_msg_msg_alloc(struct msg_msg *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)
{
	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)
{
	return call_int_hook(msg_queue_associate, 0, msq, msqflg);
}

int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
{
	return call_int_hook(msg_queue_msgctl, 0, msq, cmd);
}

int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
			       struct msg_msg *msg, int msqflg)
{
	return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg);
}

int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
			       struct task_struct *target, long type, int mode)
{
	return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode);
}

int security_shm_alloc(struct kern_ipc_perm *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)
{
	return call_int_hook(shm_associate, 0, shp, shmflg);
}

int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
{
	return call_int_hook(shm_shmctl, 0, shp, cmd);
}

int security_shm_shmat(struct kern_ipc_perm *shp, char __user *shmaddr, int shmflg)
{
	return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
}

int security_sem_alloc(struct kern_ipc_perm *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)
{
	return call_int_hook(sem_associate, 0, sma, semflg);
}

int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
{
	return call_int_hook(sem_semctl, 0, sma, cmd);
}

int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
			unsigned nsops, int alter)
{
	return call_int_hook(sem_semop, 0, sma, sops, nsops, alter);
}

void security_d_instantiate(struct dentry *dentry, struct inode *inode)
{
	if (unlikely(inode && IS_PRIVATE(inode)))
		return;
	call_void_hook(d_instantiate, dentry, inode);
}
EXPORT_SYMBOL(security_d_instantiate);

int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
				char **value)
{
	struct security_hook_list *hp;
	char *final = NULL;
	char *cp;
	int rc = 0;
	int finallen = 0;
	int display = lsm_task_display(current);
	int slot = 0;

	if (!strcmp(name, "display")) {
		/*
		 * lsm_slot will be 0 if there are no displaying modules.
		 */
		if (lsm_slot == 0)
			return -EINVAL;

		/*
		 * Only allow getting the current process' display.
		 * There are too few reasons to get another process'
		 * display and too many LSM policy issues.
		 */
		if (current != p)
			return -EINVAL;

		display = lsm_task_display(p);
		if (display != LSMBLOB_INVALID)
			slot = display;
		*value = kstrdup(lsm_slotlist[slot]->lsm, GFP_KERNEL);
		if (*value)
			return strlen(*value);
		return -ENOMEM;
	}

	if (!strcmp(name, "context")) {
		hlist_for_each_entry(hp, &security_hook_heads.getprocattr,
				     list) {
			rc = hp->hook.getprocattr(p, "context", &cp);
			if (rc == -EINVAL)
				continue;
			if (rc < 0) {
				kfree(final);
				return rc;
			}
			rc = append_ctx(&final, &finallen, hp->lsmid->lsm,
					cp, rc);
			kfree(cp);
			if (rc < 0) {
				kfree(final);
				return rc;
			}
		}
		if (final == NULL)
			return -EINVAL;
		*value = final;
		return finallen;
	}

	hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
			continue;
		if (lsm == NULL && display != LSMBLOB_INVALID &&
		    display != hp->lsmid->slot)
			continue;
		return hp->hook.getprocattr(p, name, value);
	}
	return LSM_RET_DEFAULT(getprocattr);
}

/**
 * security_setprocattr - Set process attributes via /proc
 * @lsm: name of module involved, or NULL
 * @name: name of the attribute
 * @value: value to set the attribute to
 * @size: size of the value
 *
 * Set the process attribute for the specified security module
 * to the specified value. Note that this can only be used to set
 * the process attributes for the current, or "self" process.
 * The /proc code has already done this check.
 *
 * Returns 0 on success, an appropriate code otherwise.
 */
int security_setprocattr(const char *lsm, const char *name, void *value,
			 size_t size)
{
	struct security_hook_list *hp;
	char *termed;
	char *copy;
	int *display = current->security;
	int rc = -EINVAL;
	int slot = 0;

	if (!strcmp(name, "display")) {
		/*
		 * Change the "display" value only if all the security
		 * modules that support setting a procattr allow it.
		 * It is assumed that all such security modules will be
		 * cooperative.
		 */
		if (size == 0)
			return -EINVAL;

		hlist_for_each_entry(hp, &security_hook_heads.setprocattr,
				     list) {
			rc = hp->hook.setprocattr(name, value, size);
			if (rc < 0 && rc != -EINVAL)
				return rc;
		}

		rc = -EINVAL;

		copy = kmemdup_nul(value, size, GFP_KERNEL);
		if (copy == NULL)
			return -ENOMEM;

		termed = strsep(&copy, " \n");

		for (slot = 0; slot < lsm_slot; slot++)
			if (!strcmp(termed, lsm_slotlist[slot]->lsm)) {
				*display = lsm_slotlist[slot]->slot;
				rc = size;
				break;
			}

		kfree(termed);
		return rc;
	}

	hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
		if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm))
			continue;
		if (lsm == NULL && *display != LSMBLOB_INVALID &&
		    *display != hp->lsmid->slot)
			continue;
		return hp->hook.setprocattr(name, value, size);
	}
	return LSM_RET_DEFAULT(setprocattr);
}

int security_netlink_send(struct sock *sk, struct sk_buff *skb)
{
	return call_int_hook(netlink_send, 0, sk, skb);
}

int security_ismaclabel(const char *name)
{
	return call_int_hook(ismaclabel, 0, name);
}
EXPORT_SYMBOL(security_ismaclabel);

int security_secid_to_secctx(struct lsmblob *blob, struct lsmcontext *cp,
			     int display)
{
	struct security_hook_list *hp;

	memset(cp, 0, sizeof(*cp));

	/*
	 * display either is the slot number use for formatting
	 * or an instruction on which relative slot to use.
	 */
	if (display == LSMBLOB_DISPLAY)
		display = lsm_task_display(current);
	else if (display == LSMBLOB_FIRST)
		display = LSMBLOB_INVALID;
	else if (display < 0) {
		WARN_ONCE(true,
			"LSM: %s unknown display\n", __func__);
		display = LSMBLOB_INVALID;
	} else if (display >= lsm_slot) {
		WARN_ONCE(true,
			"LSM: %s invalid display\n", __func__);
		display = LSMBLOB_INVALID;
	}


	hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		if (display == LSMBLOB_INVALID || display == hp->lsmid->slot) {
			cp->slot = hp->lsmid->slot;
			return hp->hook.secid_to_secctx(
					blob->secid[hp->lsmid->slot],
					&cp->context, &cp->len);
		}
	}

	return LSM_RET_DEFAULT(secid_to_secctx);
}
EXPORT_SYMBOL(security_secid_to_secctx);

int security_secctx_to_secid(const char *secdata, u32 seclen,
			     struct lsmblob *blob)
{
	struct security_hook_list *hp;
	int display = lsm_task_display(current);

	lsmblob_init(blob, 0);
	hlist_for_each_entry(hp, &security_hook_heads.secctx_to_secid, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
			return hp->hook.secctx_to_secid(secdata, seclen,
						&blob->secid[hp->lsmid->slot]);
	}
	return -EOPNOTSUPP;
}
EXPORT_SYMBOL(security_secctx_to_secid);

void security_release_secctx(struct lsmcontext *cp)
{
	struct security_hook_list *hp;

	hlist_for_each_entry(hp, &security_hook_heads.release_secctx, list)
		if (cp->slot == hp->lsmid->slot) {
			hp->hook.release_secctx(cp->context, cp->len);
			break;
		}

	memset(cp, 0, sizeof(*cp));
}
EXPORT_SYMBOL(security_release_secctx);

void security_inode_invalidate_secctx(struct inode *inode)
{
	call_void_hook(inode_invalidate_secctx, inode);
}
EXPORT_SYMBOL(security_inode_invalidate_secctx);

int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
	return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
}
EXPORT_SYMBOL(security_inode_notifysecctx);

int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
{
	return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen);
}
EXPORT_SYMBOL(security_inode_setsecctx);

int security_inode_getsecctx(struct inode *inode, struct lsmcontext *cp)
{
	struct security_hook_list *hp;

	memset(cp, 0, sizeof(*cp));

	hlist_for_each_entry(hp, &security_hook_heads.inode_getsecctx, list) {
		cp->slot = hp->lsmid->slot;
		return hp->hook.inode_getsecctx(inode, (void **)&cp->context,
						&cp->len);
	}
	return -EOPNOTSUPP;
}
EXPORT_SYMBOL(security_inode_getsecctx);

#ifdef CONFIG_WATCH_QUEUE
int security_post_notification(const struct cred *w_cred,
			       const struct cred *cred,
			       struct watch_notification *n)
{
	return call_int_hook(post_notification, 0, w_cred, cred, n);
}
#endif /* CONFIG_WATCH_QUEUE */

#ifdef CONFIG_KEY_NOTIFICATIONS
int security_watch_key(struct key *key)
{
	return call_int_hook(watch_key, 0, key);
}
#endif

#ifdef CONFIG_SECURITY_NETWORK

int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)
{
	return call_int_hook(unix_stream_connect, 0, sock, other, newsk);
}
EXPORT_SYMBOL(security_unix_stream_connect);

int security_unix_may_send(struct socket *sock,  struct socket *other)
{
	return call_int_hook(unix_may_send, 0, sock, other);
}
EXPORT_SYMBOL(security_unix_may_send);

int security_socket_create(int family, int type, int protocol, int kern)
{
	return call_int_hook(socket_create, 0, family, type, protocol, kern);
}

int security_socket_post_create(struct socket *sock, int family,
				int type, int protocol, int kern)
{
	return call_int_hook(socket_post_create, 0, sock, family, type,
						protocol, kern);
}

int security_socket_socketpair(struct socket *socka, struct socket *sockb)
{
	return call_int_hook(socket_socketpair, 0, socka, sockb);
}
EXPORT_SYMBOL(security_socket_socketpair);

int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
{
	return call_int_hook(socket_bind, 0, sock, address, addrlen);
}

int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
{
	return call_int_hook(socket_connect, 0, sock, address, addrlen);
}

int security_socket_listen(struct socket *sock, int backlog)
{
	return call_int_hook(socket_listen, 0, sock, backlog);
}

int security_socket_accept(struct socket *sock, struct socket *newsock)
{
	return call_int_hook(socket_accept, 0, sock, newsock);
}

int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
{
	return call_int_hook(socket_sendmsg, 0, sock, msg, size);
}

int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
			    int size, int flags)
{
	return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags);
}

int security_socket_getsockname(struct socket *sock)
{
	return call_int_hook(socket_getsockname, 0, sock);
}

int security_socket_getpeername(struct socket *sock)
{
	return call_int_hook(socket_getpeername, 0, sock);
}

int security_socket_getsockopt(struct socket *sock, int level, int optname)
{
	return call_int_hook(socket_getsockopt, 0, sock, level, optname);
}

int security_socket_setsockopt(struct socket *sock, int level, int optname)
{
	return call_int_hook(socket_setsockopt, 0, sock, level, optname);
}

int security_socket_shutdown(struct socket *sock, int how)
{
	return call_int_hook(socket_shutdown, 0, sock, how);
}

int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	return call_int_hook(socket_sock_rcv_skb, 0, sk, skb);
}
EXPORT_SYMBOL(security_sock_rcv_skb);

int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
				      int __user *optlen, unsigned len)
{
	int display = lsm_task_display(current);
	struct security_hook_list *hp;

	hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_stream,
			     list)
		if (display == LSMBLOB_INVALID || display == hp->lsmid->slot)
			return hp->hook.socket_getpeersec_stream(sock, optval,
								 optlen, len);
	return -ENOPROTOOPT;
}

int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb,
				     struct lsmblob *blob)
{
	struct security_hook_list *hp;
	int rc = -ENOPROTOOPT;

	hlist_for_each_entry(hp, &security_hook_heads.socket_getpeersec_dgram,
			     list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		rc = hp->hook.socket_getpeersec_dgram(sock, skb,
						&blob->secid[hp->lsmid->slot]);
		if (rc != 0)
			break;
	}
	return rc;
}
EXPORT_SYMBOL(security_socket_getpeersec_dgram);

int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
{
	int rc = lsm_sock_alloc(sk, priority);

	if (unlikely(rc))
		return rc;
	rc = call_int_hook(sk_alloc_security, 0, sk, family, priority);
	if (unlikely(rc))
		security_sk_free(sk);
	return rc;
}

void security_sk_free(struct sock *sk)
{
	call_void_hook(sk_free_security, sk);
	kfree(sk->sk_security);
	sk->sk_security = NULL;
}

void security_sk_clone(const struct sock *sk, struct sock *newsk)
{
	call_void_hook(sk_clone_security, sk, newsk);
}
EXPORT_SYMBOL(security_sk_clone);

void security_sk_classify_flow(struct sock *sk, struct flowi_common *flic)
{
	call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
}
EXPORT_SYMBOL(security_sk_classify_flow);

void security_req_classify_flow(const struct request_sock *req,
				struct flowi_common *flic)
{
	call_void_hook(req_classify_flow, req, flic);
}
EXPORT_SYMBOL(security_req_classify_flow);

void security_sock_graft(struct sock *sk, struct socket *parent)
{
	call_void_hook(sock_graft, sk, parent);
}
EXPORT_SYMBOL(security_sock_graft);

int security_inet_conn_request(const struct sock *sk,
			struct sk_buff *skb, struct request_sock *req)
{
	return call_int_hook(inet_conn_request, 0, sk, skb, req);
}
EXPORT_SYMBOL(security_inet_conn_request);

void security_inet_csk_clone(struct sock *newsk,
			const struct request_sock *req)
{
	call_void_hook(inet_csk_clone, newsk, req);
}

void security_inet_conn_established(struct sock *sk,
			struct sk_buff *skb)
{
	call_void_hook(inet_conn_established, sk, skb);
}
EXPORT_SYMBOL(security_inet_conn_established);

int security_secmark_relabel_packet(struct lsmblob *blob)
{
	struct security_hook_list *hp;
	int rc = 0;

	hlist_for_each_entry(hp, &security_hook_heads.secmark_relabel_packet,
			     list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		rc = hp->hook.secmark_relabel_packet(
						blob->secid[hp->lsmid->slot]);
		if (rc != 0)
			break;
	}
	return rc;
}
EXPORT_SYMBOL(security_secmark_relabel_packet);

void security_secmark_refcount_inc(void)
{
	call_void_hook(secmark_refcount_inc);
}
EXPORT_SYMBOL(security_secmark_refcount_inc);

void security_secmark_refcount_dec(void)
{
	call_void_hook(secmark_refcount_dec);
}
EXPORT_SYMBOL(security_secmark_refcount_dec);

int security_tun_dev_alloc_security(void **security)
{
	return call_int_hook(tun_dev_alloc_security, 0, security);
}
EXPORT_SYMBOL(security_tun_dev_alloc_security);

void security_tun_dev_free_security(void *security)
{
	call_void_hook(tun_dev_free_security, security);
}
EXPORT_SYMBOL(security_tun_dev_free_security);

int security_tun_dev_create(void)
{
	return call_int_hook(tun_dev_create, 0);
}
EXPORT_SYMBOL(security_tun_dev_create);

int security_tun_dev_attach_queue(void *security)
{
	return call_int_hook(tun_dev_attach_queue, 0, security);
}
EXPORT_SYMBOL(security_tun_dev_attach_queue);

int security_tun_dev_attach(struct sock *sk, void *security)
{
	return call_int_hook(tun_dev_attach, 0, sk, security);
}
EXPORT_SYMBOL(security_tun_dev_attach);

int security_tun_dev_open(void *security)
{
	return call_int_hook(tun_dev_open, 0, security);
}
EXPORT_SYMBOL(security_tun_dev_open);

int security_sctp_assoc_request(struct sctp_endpoint *ep, struct sk_buff *skb)
{
	return call_int_hook(sctp_assoc_request, 0, ep, skb);
}
EXPORT_SYMBOL(security_sctp_assoc_request);

int security_sctp_bind_connect(struct sock *sk, int optname,
			       struct sockaddr *address, int addrlen)
{
	return call_int_hook(sctp_bind_connect, 0, sk, optname,
			     address, addrlen);
}
EXPORT_SYMBOL(security_sctp_bind_connect);

void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
			    struct sock *newsk)
{
	call_void_hook(sctp_sk_clone, ep, sk, newsk);
}
EXPORT_SYMBOL(security_sctp_sk_clone);

#endif	/* CONFIG_SECURITY_NETWORK */

#ifdef CONFIG_SECURITY_INFINIBAND

int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
{
	return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey);
}
EXPORT_SYMBOL(security_ib_pkey_access);

int security_ib_endport_manage_subnet(void *sec, const char *dev_name, u8 port_num)
{
	return call_int_hook(ib_endport_manage_subnet, 0, sec, dev_name, port_num);
}
EXPORT_SYMBOL(security_ib_endport_manage_subnet);

int security_ib_alloc_security(void **sec)
{
	return call_int_hook(ib_alloc_security, 0, sec);
}
EXPORT_SYMBOL(security_ib_alloc_security);

void security_ib_free_security(void *sec)
{
	call_void_hook(ib_free_security, sec);
}
EXPORT_SYMBOL(security_ib_free_security);
#endif	/* CONFIG_SECURITY_INFINIBAND */

#ifdef CONFIG_SECURITY_NETWORK_XFRM

int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
			       struct xfrm_user_sec_ctx *sec_ctx,
			       gfp_t gfp)
{
	return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp);
}
EXPORT_SYMBOL(security_xfrm_policy_alloc);

int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
			      struct xfrm_sec_ctx **new_ctxp)
{
	return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp);
}

void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
{
	call_void_hook(xfrm_policy_free_security, ctx);
}
EXPORT_SYMBOL(security_xfrm_policy_free);

int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
{
	return call_int_hook(xfrm_policy_delete_security, 0, ctx);
}

int security_xfrm_state_alloc(struct xfrm_state *x,
			      struct xfrm_user_sec_ctx *sec_ctx)
{
	return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx);
}
EXPORT_SYMBOL(security_xfrm_state_alloc);

int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
				      struct xfrm_sec_ctx *polsec, u32 secid)
{
	return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid);
}

int security_xfrm_state_delete(struct xfrm_state *x)
{
	return call_int_hook(xfrm_state_delete_security, 0, x);
}
EXPORT_SYMBOL(security_xfrm_state_delete);

void security_xfrm_state_free(struct xfrm_state *x)
{
	call_void_hook(xfrm_state_free_security, x);
}

int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
{
	return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
}

int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
				       struct xfrm_policy *xp,
				       const struct flowi_common *flic)
{
	struct security_hook_list *hp;
	int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);

	/*
	 * Since this function is expected to return 0 or 1, the judgment
	 * becomes difficult if multiple LSMs supply this call. Fortunately,
	 * we can use the first LSM's judgment because currently only SELinux
	 * supplies this call.
	 *
	 * For speed optimization, we explicitly break the loop rather than
	 * using the macro
	 */
	hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
				list) {
		rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic);
		break;
	}
	return rc;
}

int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
{
	return call_int_hook(xfrm_decode_session, 0, skb, secid, 1);
}

void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
{
	int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid,
				0);

	BUG_ON(rc);
}
EXPORT_SYMBOL(security_skb_classify_flow);

#endif	/* CONFIG_SECURITY_NETWORK_XFRM */

#ifdef CONFIG_KEYS

int security_key_alloc(struct key *key, const struct cred *cred,
		       unsigned long flags)
{
	return call_int_hook(key_alloc, 0, key, cred, flags);
}

void security_key_free(struct key *key)
{
	call_void_hook(key_free, key);
}

int security_key_permission(key_ref_t key_ref, const struct cred *cred,
			    enum key_need_perm need_perm)
{
	return call_int_hook(key_permission, 0, key_ref, cred, need_perm);
}

int security_key_getsecurity(struct key *key, char **_buffer)
{
	*_buffer = NULL;
	return call_int_hook(key_getsecurity, 0, key, _buffer);
}

#endif	/* CONFIG_KEYS */

#ifdef CONFIG_AUDIT

int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
{
	struct security_hook_list *hp;
	int display = lsm_task_display(current);

	hlist_for_each_entry(hp, &security_hook_heads.audit_rule_init, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		if (display != LSMBLOB_INVALID && display != hp->lsmid->slot)
			continue;
		return hp->hook.audit_rule_init(field, op, rulestr,
						&lsmrule[hp->lsmid->slot]);
	}
	return 0;
}

int security_audit_rule_known(struct audit_krule *krule)
{
	return call_int_hook(audit_rule_known, 0, krule);
}

void security_audit_rule_free(void **lsmrule)
{
	struct security_hook_list *hp;

	hlist_for_each_entry(hp, &security_hook_heads.audit_rule_free, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		if (lsmrule[hp->lsmid->slot] == NULL)
			continue;
		hp->hook.audit_rule_free(lsmrule[hp->lsmid->slot]);
	}
}

int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
			      void **lsmrule)
{
	struct security_hook_list *hp;
	int rc;

	hlist_for_each_entry(hp, &security_hook_heads.audit_rule_match, list) {
		if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
			continue;
		if (lsmrule[hp->lsmid->slot] == NULL)
			continue;
		if (lsmrule[hp->lsmid->slot] == NULL)
			continue;
		rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot],
					       field, op,
					       &lsmrule[hp->lsmid->slot]);
		if (rc)
			return rc;
	}
	return 0;
}
#endif /* CONFIG_AUDIT */

#ifdef CONFIG_BPF_SYSCALL
int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
{
	return call_int_hook(bpf, 0, cmd, attr, size);
}
int security_bpf_map(struct bpf_map *map, fmode_t fmode)
{
	return call_int_hook(bpf_map, 0, map, fmode);
}
int security_bpf_prog(struct bpf_prog *prog)
{
	return call_int_hook(bpf_prog, 0, prog);
}
int security_bpf_map_alloc(struct bpf_map *map)
{
	return call_int_hook(bpf_map_alloc_security, 0, map);
}
int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
{
	return call_int_hook(bpf_prog_alloc_security, 0, aux);
}
void security_bpf_map_free(struct bpf_map *map)
{
	call_void_hook(bpf_map_free_security, map);
}
void security_bpf_prog_free(struct bpf_prog_aux *aux)
{
	call_void_hook(bpf_prog_free_security, aux);
}
#endif /* CONFIG_BPF_SYSCALL */

int security_locked_down(enum lockdown_reason what)
{
	return call_int_hook(locked_down, 0, what);
}
EXPORT_SYMBOL(security_locked_down);

#ifdef CONFIG_PERF_EVENTS
int security_perf_event_open(struct perf_event_attr *attr, int type)
{
	return call_int_hook(perf_event_open, 0, attr, type);
}

int security_perf_event_alloc(struct perf_event *event)
{
	return call_int_hook(perf_event_alloc, 0, event);
}

void security_perf_event_free(struct perf_event *event)
{
	call_void_hook(perf_event_free, event);
}

int security_perf_event_read(struct perf_event *event)
{
	return call_int_hook(perf_event_read, 0, event);
}

int security_perf_event_write(struct perf_event *event)
{
	return call_int_hook(perf_event_write, 0, event);
}
#endif /* CONFIG_PERF_EVENTS */