UBUNTU: Ubuntu-5.15.0-39.42

[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_KGDB] = "KDB or KGDB access",
        [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(const struct cred *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 creds 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(const struct cred *from,
                                const struct cred *to)
{
        int from_display = lsm_cred_display(from);
        int to_display = lsm_cred_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(const struct cred *from,
                                    const struct cred *to)
{
        return call_int_hook(binder_transfer_binder, 0, from, to);
}
EXPORT_SYMBOL(security_binder_transfer_binder);

int security_binder_transfer_file(const struct cred *from,
                                  const struct cred *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)
{
        struct security_hook_list *hp;
        int trc;
        int rc = -ENOPARAM;

        hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
                             list) {
                trc = hp->hook.fs_context_parse_param(fc, param);
                if (trc == 0)
                        rc = 0;
                else if (trc != -ENOPARAM)
                        return trc;
        }
        return rc;
}

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);
}
EXPORT_SYMBOL_GPL(security_path_rmdir);

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);
}
EXPORT_SYMBOL_GPL(security_path_symlink);

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);
}
EXPORT_SYMBOL_GPL(security_path_link);

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);
}
EXPORT_SYMBOL_GPL(security_path_truncate);

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);
}
EXPORT_SYMBOL_GPL(security_path_chmod);

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);
}
EXPORT_SYMBOL_GPL(security_path_chown);

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);
}
EXPORT_SYMBOL_GPL(security_inode_permission);

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);
}
EXPORT_SYMBOL_GPL(security_file_permission);

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);

int security_lock_kernel_down(const char *where, enum lockdown_reason level)
{
        return call_int_hook(lock_kernel_down, 0, where, level);
}
EXPORT_SYMBOL(security_lock_kernel_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 */