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-rw-r--r--security/security.c5357
1 files changed, 5357 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
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index 0000000000..840a3d58a2
--- /dev/null
+++ b/security/security.c
@@ -0,0 +1,5357 @@
+// 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
+ * Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com>
+ */
+
+#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>
+
+/* 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_DEVICE_TREE] = "modifying device tree contents",
+ [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_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
+ [LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
+ [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_DBG_READ_KERNEL] = "use of kgdb/kdb 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 __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;
+static struct lsm_blob_sizes blob_sizes __ro_after_init;
+
+/* 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 ordered: %s (%s)\n", from, lsm->name,
+ is_enabled(lsm) ? "enabled" : "disabled");
+}
+
+/* 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)
+ return;
+
+ offset = ALIGN(*lbs, sizeof(void *));
+ *lbs = offset + *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_task, &blob_sizes.lbs_task);
+ lsm_set_blob_size(&needed->lbs_xattr_count,
+ &blob_sizes.lbs_xattr_count);
+}
+
+/* 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 (only one legacy major LSM)\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 (strcmp(lsm->name, name) == 0) {
+ if (lsm->order == LSM_ORDER_MUTABLE)
+ append_ordered_lsm(lsm, origin);
+ found = true;
+ }
+ }
+
+ if (!found)
+ init_debug("%s ignored: %s (not built into kernel)\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=");
+ }
+ }
+
+ /* LSM_ORDER_LAST is always last. */
+ for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+ if (lsm->order == LSM_ORDER_LAST)
+ append_ordered_lsm(lsm, " last");
+ }
+
+ /* 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 skipped: %s (not in requested order)\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 report_lsm_order(void)
+{
+ struct lsm_info **lsm, *early;
+ int first = 0;
+
+ pr_info("initializing lsm=");
+
+ /* Report each enabled LSM name, comma separated. */
+ for (early = __start_early_lsm_info;
+ early < __end_early_lsm_info; early++)
+ if (is_enabled(early))
+ pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
+ for (lsm = ordered_lsms; *lsm; lsm++)
+ if (is_enabled(*lsm))
+ pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
+
+ pr_cont("\n");
+}
+
+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_warn("security=%s is ignored because it is superseded by lsm=%s\n",
+ chosen_major_lsm, chosen_lsm_order);
+ 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);
+
+ report_lsm_order();
+
+ 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("task blob size = %d\n", blob_sizes.lbs_task);
+ init_debug("xattr slots = %d\n", blob_sizes.lbs_xattr_count);
+
+ /*
+ * 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)
+{
+ struct lsm_info *lsm;
+
+#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
+ INIT_HLIST_HEAD(&security_hook_heads.NAME);
+#include "linux/lsm_hook_defs.h"
+#undef LSM_HOOK
+
+ 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;
+
+ init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
+ init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
+ init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
+
+ /*
+ * 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++) {
+ init_debug(" early started: %s (%s)\n", lsm->name,
+ is_enabled(lsm) ? "enabled" : "disabled");
+ 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;
+}
+
+/**
+ * security_add_hooks - Add a modules hooks to the hook lists.
+ * @hooks: the hooks to add
+ * @count: the number of hooks to add
+ * @lsm: the name of the security module
+ *
+ * Each LSM has to register its hooks with the infrastructure.
+ */
+void __init security_add_hooks(struct security_hook_list *hooks, int count,
+ const char *lsm)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ hooks[i].lsm = lsm;
+ 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(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)
+{
+ if (blob_sizes.lbs_task == 0) {
+ task->security = NULL;
+ return 0;
+ }
+
+ task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
+ if (task->security == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+/**
+ * lsm_ipc_alloc - allocate a composite ipc blob
+ * @kip: the ipc that needs a blob
+ *
+ * Allocate the ipc blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+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_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__);
+}
+
+/**
+ * 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 __maybe_unused 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 */
+
+/**
+ * security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
+ * @mgr: task credentials of current binder process
+ *
+ * Check whether @mgr is allowed to be the binder context manager.
+ *
+ * Return: Return 0 if permission is granted.
+ */
+int security_binder_set_context_mgr(const struct cred *mgr)
+{
+ return call_int_hook(binder_set_context_mgr, 0, mgr);
+}
+
+/**
+ * security_binder_transaction() - Check if a binder transaction is allowed
+ * @from: sending process
+ * @to: receiving process
+ *
+ * Check whether @from is allowed to invoke a binder transaction call to @to.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_binder_transaction(const struct cred *from,
+ const struct cred *to)
+{
+ return call_int_hook(binder_transaction, 0, from, to);
+}
+
+/**
+ * security_binder_transfer_binder() - Check if a binder transfer is allowed
+ * @from: sending process
+ * @to: receiving process
+ *
+ * Check whether @from is allowed to transfer a binder reference to @to.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_binder_transfer_binder(const struct cred *from,
+ const struct cred *to)
+{
+ return call_int_hook(binder_transfer_binder, 0, from, to);
+}
+
+/**
+ * security_binder_transfer_file() - Check if a binder file xfer is allowed
+ * @from: sending process
+ * @to: receiving process
+ * @file: file being transferred
+ *
+ * Check whether @from is allowed to transfer @file to @to.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_binder_transfer_file(const struct cred *from,
+ const struct cred *to, const struct file *file)
+{
+ return call_int_hook(binder_transfer_file, 0, from, to, file);
+}
+
+/**
+ * security_ptrace_access_check() - Check if tracing is allowed
+ * @child: target process
+ * @mode: PTRACE_MODE flags
+ *
+ * Check permission before allowing the current process to trace the @child
+ * process. Security modules may also want to perform a process tracing check
+ * during an execve in the set_security or apply_creds hooks of tracing check
+ * during an execve in the bprm_set_creds hook of binprm_security_ops if the
+ * process is being traced and its security attributes would be changed by the
+ * execve.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
+{
+ return call_int_hook(ptrace_access_check, 0, child, mode);
+}
+
+/**
+ * security_ptrace_traceme() - Check if tracing is allowed
+ * @parent: tracing process
+ *
+ * Check that the @parent process has sufficient permission to trace the
+ * current process before allowing the current process to present itself to the
+ * @parent process for tracing.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_ptrace_traceme(struct task_struct *parent)
+{
+ return call_int_hook(ptrace_traceme, 0, parent);
+}
+
+/**
+ * security_capget() - Get the capability sets for a process
+ * @target: target process
+ * @effective: effective capability set
+ * @inheritable: inheritable capability set
+ * @permitted: permitted capability set
+ *
+ * Get the @effective, @inheritable, and @permitted capability sets for the
+ * @target process. The hook may also perform permission checking to determine
+ * if the current process is allowed to see the capability sets of the @target
+ * process.
+ *
+ * Return: Returns 0 if the capability sets were successfully obtained.
+ */
+int security_capget(const 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);
+}
+
+/**
+ * security_capset() - Set the capability sets for a process
+ * @new: new credentials for the target process
+ * @old: current credentials of the target process
+ * @effective: effective capability set
+ * @inheritable: inheritable capability set
+ * @permitted: permitted capability set
+ *
+ * Set the @effective, @inheritable, and @permitted capability sets for the
+ * current process.
+ *
+ * Return: Returns 0 and update @new if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_capable() - Check if a process has the necessary capability
+ * @cred: credentials to examine
+ * @ns: user namespace
+ * @cap: capability requested
+ * @opts: capability check options
+ *
+ * Check whether the @tsk process has the @cap capability in the indicated
+ * credentials. @cap contains the capability <include/linux/capability.h>.
+ * @opts contains options for the capable check <include/linux/security.h>.
+ *
+ * Return: Returns 0 if the capability is granted.
+ */
+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);
+}
+
+/**
+ * security_quotactl() - Check if a quotactl() syscall is allowed for this fs
+ * @cmds: commands
+ * @type: type
+ * @id: id
+ * @sb: filesystem
+ *
+ * Check whether the quotactl syscall is allowed for this @sb.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_quotactl(int cmds, int type, int id, struct super_block *sb)
+{
+ return call_int_hook(quotactl, 0, cmds, type, id, sb);
+}
+
+/**
+ * security_quota_on() - Check if QUOTAON is allowed for a dentry
+ * @dentry: dentry
+ *
+ * Check whether QUOTAON is allowed for @dentry.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_quota_on(struct dentry *dentry)
+{
+ return call_int_hook(quota_on, 0, dentry);
+}
+
+/**
+ * security_syslog() - Check if accessing the kernel message ring is allowed
+ * @type: SYSLOG_ACTION_* type
+ *
+ * Check permission before accessing the kernel message ring or changing
+ * logging to the console. See the syslog(2) manual page for an explanation of
+ * the @type values.
+ *
+ * Return: Return 0 if permission is granted.
+ */
+int security_syslog(int type)
+{
+ return call_int_hook(syslog, 0, type);
+}
+
+/**
+ * security_settime64() - Check if changing the system time is allowed
+ * @ts: new time
+ * @tz: timezone
+ *
+ * Check permission to change the system time, struct timespec64 is defined in
+ * <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
+{
+ return call_int_hook(settime, 0, ts, tz);
+}
+
+/**
+ * security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
+ * @mm: mm struct
+ * @pages: number of pages
+ *
+ * Check permissions for allocating a new virtual mapping. If all LSMs return
+ * a positive value, __vm_enough_memory() will be called with cap_sys_admin
+ * set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
+ * called with cap_sys_admin cleared.
+ *
+ * Return: Returns 0 if permission is granted by the LSM infrastructure to the
+ * caller.
+ */
+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);
+}
+
+/**
+ * security_bprm_creds_for_exec() - Prepare the credentials for exec()
+ * @bprm: binary program information
+ *
+ * If the setup in prepare_exec_creds did not setup @bprm->cred->security
+ * properly for executing @bprm->file, update the LSM's portion of
+ * @bprm->cred->security to be what commit_creds needs to install for the new
+ * program. This hook may also optionally check permissions (e.g. for
+ * transitions between security domains). The hook must set @bprm->secureexec
+ * to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
+ * contains the linux_binprm structure.
+ *
+ * Return: Returns 0 if the hook is successful and permission is granted.
+ */
+int security_bprm_creds_for_exec(struct linux_binprm *bprm)
+{
+ return call_int_hook(bprm_creds_for_exec, 0, bprm);
+}
+
+/**
+ * security_bprm_creds_from_file() - Update linux_binprm creds based on file
+ * @bprm: binary program information
+ * @file: associated file
+ *
+ * If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
+ * exec, update @bprm->cred to reflect that change. This is called after
+ * finding the binary that will be executed without an interpreter. This
+ * ensures that the credentials will not be derived from a script that the
+ * binary will need to reopen, which when reopend may end up being a completely
+ * different file. This hook may also optionally check permissions (e.g. for
+ * transitions between security domains). The hook must set @bprm->secureexec
+ * to 1 if AT_SECURE should be set to request libc enable secure mode. The
+ * hook must add to @bprm->per_clear any personality flags that should be
+ * cleared from current->personality. @bprm contains the linux_binprm
+ * structure.
+ *
+ * Return: Returns 0 if the hook is successful and permission is granted.
+ */
+int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file)
+{
+ return call_int_hook(bprm_creds_from_file, 0, bprm, file);
+}
+
+/**
+ * security_bprm_check() - Mediate binary handler search
+ * @bprm: binary program information
+ *
+ * This hook mediates the point when a search for a binary handler will begin.
+ * It allows a check against the @bprm->cred->security value which was set in
+ * the preceding creds_for_exec call. The argv list and envp list are reliably
+ * available in @bprm. This hook may be called multiple times during a single
+ * execve. @bprm contains the linux_binprm structure.
+ *
+ * Return: Returns 0 if the hook is successful and permission is granted.
+ */
+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);
+}
+
+/**
+ * security_bprm_committing_creds() - Install creds for a process during exec()
+ * @bprm: binary program information
+ *
+ * Prepare to install the new security attributes of a process being
+ * transformed by an execve operation, based on the old credentials pointed to
+ * by @current->cred and the information set in @bprm->cred by the
+ * bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
+ * hook is a good place to perform state changes on the process such as closing
+ * open file descriptors to which access will no longer be granted when the
+ * attributes are changed. This is called immediately before commit_creds().
+ */
+void security_bprm_committing_creds(struct linux_binprm *bprm)
+{
+ call_void_hook(bprm_committing_creds, bprm);
+}
+
+/**
+ * security_bprm_committed_creds() - Tidy up after cred install during exec()
+ * @bprm: binary program information
+ *
+ * Tidy up after the installation of the new security attributes of a process
+ * being transformed by an execve operation. The new credentials have, by this
+ * point, been set to @current->cred. @bprm points to the linux_binprm
+ * structure. This hook is a good place to perform state changes on the
+ * process such as clearing out non-inheritable signal state. This is called
+ * immediately after commit_creds().
+ */
+void security_bprm_committed_creds(struct linux_binprm *bprm)
+{
+ call_void_hook(bprm_committed_creds, bprm);
+}
+
+/**
+ * security_fs_context_submount() - Initialise fc->security
+ * @fc: new filesystem context
+ * @reference: dentry reference for submount/remount
+ *
+ * Fill out the ->security field for a new fs_context.
+ *
+ * Return: Returns 0 on success or negative error code on failure.
+ */
+int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
+{
+ return call_int_hook(fs_context_submount, 0, fc, reference);
+}
+
+/**
+ * security_fs_context_dup() - Duplicate a fs_context LSM blob
+ * @fc: destination filesystem context
+ * @src_fc: source filesystem context
+ *
+ * Allocate and attach a security structure to sc->security. This pointer is
+ * initialised to NULL by the caller. @fc indicates the new filesystem context.
+ * @src_fc indicates the original filesystem context.
+ *
+ * Return: Returns 0 on success or a negative error code on failure.
+ */
+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);
+}
+
+/**
+ * security_fs_context_parse_param() - Configure a filesystem context
+ * @fc: filesystem context
+ * @param: filesystem parameter
+ *
+ * Userspace provided a parameter to configure a superblock. The LSM can
+ * consume the parameter or return it to the caller for use elsewhere.
+ *
+ * Return: If the parameter is used by the LSM it should return 0, if it is
+ * returned to the caller -ENOPARAM is returned, otherwise a negative
+ * error code is returned.
+ */
+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;
+}
+
+/**
+ * security_sb_alloc() - Allocate a super_block LSM blob
+ * @sb: filesystem superblock
+ *
+ * Allocate and attach a security structure to the sb->s_security field. The
+ * s_security field is initialized to NULL when the structure is allocated.
+ * @sb contains the super_block structure to be modified.
+ *
+ * Return: Returns 0 if operation was successful.
+ */
+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;
+}
+
+/**
+ * security_sb_delete() - Release super_block LSM associated objects
+ * @sb: filesystem superblock
+ *
+ * Release objects tied to a superblock (e.g. inodes). @sb contains the
+ * super_block structure being released.
+ */
+void security_sb_delete(struct super_block *sb)
+{
+ call_void_hook(sb_delete, sb);
+}
+
+/**
+ * security_sb_free() - Free a super_block LSM blob
+ * @sb: filesystem superblock
+ *
+ * Deallocate and clear the sb->s_security field. @sb contains the super_block
+ * structure to be modified.
+ */
+void security_sb_free(struct super_block *sb)
+{
+ call_void_hook(sb_free_security, sb);
+ kfree(sb->s_security);
+ sb->s_security = NULL;
+}
+
+/**
+ * security_free_mnt_opts() - Free memory associated with mount options
+ * @mnt_opts: LSM processed mount options
+ *
+ * Free memory associated with @mnt_ops.
+ */
+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);
+
+/**
+ * security_sb_eat_lsm_opts() - Consume LSM mount options
+ * @options: mount options
+ * @mnt_opts: LSM processed mount options
+ *
+ * Eat (scan @options) and save them in @mnt_opts.
+ *
+ * Return: Returns 0 on success, negative values on failure.
+ */
+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);
+
+/**
+ * security_sb_mnt_opts_compat() - Check if new mount options are allowed
+ * @sb: filesystem superblock
+ * @mnt_opts: new mount options
+ *
+ * Determine if the new mount options in @mnt_opts are allowed given the
+ * existing mounted filesystem at @sb. @sb superblock being compared.
+ *
+ * Return: Returns 0 if options are compatible.
+ */
+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);
+
+/**
+ * security_sb_remount() - Verify no incompatible mount changes during remount
+ * @sb: filesystem superblock
+ * @mnt_opts: (re)mount options
+ *
+ * Extracts security system specific mount options and verifies no changes are
+ * being made to those options.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_sb_kern_mount() - Check if a kernel mount is allowed
+ * @sb: filesystem superblock
+ *
+ * Mount this @sb if allowed by permissions.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_sb_kern_mount(struct super_block *sb)
+{
+ return call_int_hook(sb_kern_mount, 0, sb);
+}
+
+/**
+ * security_sb_show_options() - Output the mount options for a superblock
+ * @m: output file
+ * @sb: filesystem superblock
+ *
+ * Show (print on @m) mount options for this @sb.
+ *
+ * Return: Returns 0 on success, negative values on failure.
+ */
+int security_sb_show_options(struct seq_file *m, struct super_block *sb)
+{
+ return call_int_hook(sb_show_options, 0, m, sb);
+}
+
+/**
+ * security_sb_statfs() - Check if accessing fs stats is allowed
+ * @dentry: superblock handle
+ *
+ * Check permission before obtaining filesystem statistics for the @mnt
+ * mountpoint. @dentry is a handle on the superblock for the filesystem.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_sb_statfs(struct dentry *dentry)
+{
+ return call_int_hook(sb_statfs, 0, dentry);
+}
+
+/**
+ * security_sb_mount() - Check permission for mounting a filesystem
+ * @dev_name: filesystem backing device
+ * @path: mount point
+ * @type: filesystem type
+ * @flags: mount flags
+ * @data: filesystem specific data
+ *
+ * Check permission before an object specified by @dev_name is mounted on the
+ * mount point named by @nd. For an ordinary mount, @dev_name identifies a
+ * device if the file system type requires a device. For a remount
+ * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
+ * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
+ * mounted.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_sb_umount() - Check permission for unmounting a filesystem
+ * @mnt: mounted filesystem
+ * @flags: unmount flags
+ *
+ * Check permission before the @mnt file system is unmounted.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_sb_umount(struct vfsmount *mnt, int flags)
+{
+ return call_int_hook(sb_umount, 0, mnt, flags);
+}
+
+/**
+ * security_sb_pivotroot() - Check permissions for pivoting the rootfs
+ * @old_path: new location for current rootfs
+ * @new_path: location of the new rootfs
+ *
+ * Check permission before pivoting the root filesystem.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_sb_set_mnt_opts() - Set the mount options for a filesystem
+ * @sb: filesystem superblock
+ * @mnt_opts: binary mount options
+ * @kern_flags: kernel flags (in)
+ * @set_kern_flags: kernel flags (out)
+ *
+ * Set the security relevant mount options used for a superblock.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+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);
+
+/**
+ * security_sb_clone_mnt_opts() - Duplicate superblock mount options
+ * @oldsb: source superblock
+ * @newsb: destination superblock
+ * @kern_flags: kernel flags (in)
+ * @set_kern_flags: kernel flags (out)
+ *
+ * Copy all security options from a given superblock to another.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+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);
+
+/**
+ * security_move_mount() - Check permissions for moving a mount
+ * @from_path: source mount point
+ * @to_path: destination mount point
+ *
+ * Check permission before a mount is moved.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_notify() - Check if setting a watch is allowed
+ * @path: file path
+ * @mask: event mask
+ * @obj_type: file path type
+ *
+ * Check permissions before setting a watch on events as defined by @mask, on
+ * an object at @path, whose type is defined by @obj_type.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_alloc() - Allocate an inode LSM blob
+ * @inode: the inode
+ *
+ * Allocate and attach a security structure to @inode->i_security. The
+ * i_security field is initialized to NULL when the inode structure is
+ * allocated.
+ *
+ * Return: Return 0 if operation was successful.
+ */
+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);
+}
+
+/**
+ * security_inode_free() - Free an inode's LSM blob
+ * @inode: the inode
+ *
+ * Deallocate the inode security structure and set @inode->i_security to NULL.
+ */
+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);
+}
+
+/**
+ * security_dentry_init_security() - Perform dentry initialization
+ * @dentry: the dentry to initialize
+ * @mode: mode used to determine resource type
+ * @name: name of the last path component
+ * @xattr_name: name of the security/LSM xattr
+ * @ctx: pointer to the resulting LSM context
+ * @ctxlen: length of @ctx
+ *
+ * Compute a context for a dentry as the inode is not yet available since NFSv4
+ * has no label backed by an EA anyway. It is important to note that
+ * @xattr_name does not need to be free'd by the caller, it is a static string.
+ *
+ * Return: Returns 0 on success, negative values on failure.
+ */
+int security_dentry_init_security(struct dentry *dentry, int mode,
+ const struct qstr *name,
+ const char **xattr_name, void **ctx,
+ u32 *ctxlen)
+{
+ struct security_hook_list *hp;
+ int rc;
+
+ /*
+ * Only one module will provide a security context.
+ */
+ hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security,
+ list) {
+ rc = hp->hook.dentry_init_security(dentry, mode, name,
+ xattr_name, ctx, ctxlen);
+ if (rc != LSM_RET_DEFAULT(dentry_init_security))
+ return rc;
+ }
+ return LSM_RET_DEFAULT(dentry_init_security);
+}
+EXPORT_SYMBOL(security_dentry_init_security);
+
+/**
+ * security_dentry_create_files_as() - Perform dentry initialization
+ * @dentry: the dentry to initialize
+ * @mode: mode used to determine resource type
+ * @name: name of the last path component
+ * @old: creds to use for LSM context calculations
+ * @new: creds to modify
+ *
+ * Compute a context for a dentry as the inode is not yet available and set
+ * that context in passed in creds so that new files are created using that
+ * context. Context is calculated using the passed in creds and not the creds
+ * of the caller.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+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);
+
+/**
+ * security_inode_init_security() - Initialize an inode's LSM context
+ * @inode: the inode
+ * @dir: parent directory
+ * @qstr: last component of the pathname
+ * @initxattrs: callback function to write xattrs
+ * @fs_data: filesystem specific data
+ *
+ * Obtain the security attribute name suffix and value to set on a newly
+ * created inode and set up the incore security field for the new inode. This
+ * hook is called by the fs code as part of the inode creation transaction and
+ * provides for atomic labeling of the inode, unlike the post_create/mkdir/...
+ * hooks called by the VFS.
+ *
+ * The hook function is expected to populate the xattrs array, by calling
+ * lsm_get_xattr_slot() to retrieve the slots reserved by the security module
+ * with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
+ * slot, the hook function should set ->name to the attribute name suffix
+ * (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
+ * to the attribute value, to set ->value_len to the length of the value. If
+ * the security module does not use security attributes or does not wish to put
+ * a security attribute on this particular inode, then it should return
+ * -EOPNOTSUPP to skip this processing.
+ *
+ * Return: Returns 0 if the LSM successfully initialized all of the inode
+ * security attributes that are required, negative values otherwise.
+ */
+int security_inode_init_security(struct inode *inode, struct inode *dir,
+ const struct qstr *qstr,
+ const initxattrs initxattrs, void *fs_data)
+{
+ struct security_hook_list *hp;
+ struct xattr *new_xattrs = NULL;
+ int ret = -EOPNOTSUPP, xattr_count = 0;
+
+ if (unlikely(IS_PRIVATE(inode)))
+ return 0;
+
+ if (!blob_sizes.lbs_xattr_count)
+ return 0;
+
+ if (initxattrs) {
+ /* Allocate +1 for EVM and +1 as terminator. */
+ new_xattrs = kcalloc(blob_sizes.lbs_xattr_count + 2,
+ sizeof(*new_xattrs), GFP_NOFS);
+ if (!new_xattrs)
+ return -ENOMEM;
+ }
+
+ hlist_for_each_entry(hp, &security_hook_heads.inode_init_security,
+ list) {
+ ret = hp->hook.inode_init_security(inode, dir, qstr, new_xattrs,
+ &xattr_count);
+ if (ret && ret != -EOPNOTSUPP)
+ goto out;
+ /*
+ * As documented in lsm_hooks.h, -EOPNOTSUPP in this context
+ * means that the LSM is not willing to provide an xattr, not
+ * that it wants to signal an error. Thus, continue to invoke
+ * the remaining LSMs.
+ */
+ }
+
+ /* If initxattrs() is NULL, xattr_count is zero, skip the call. */
+ if (!xattr_count)
+ goto out;
+
+ ret = evm_inode_init_security(inode, dir, qstr, new_xattrs,
+ &xattr_count);
+ if (ret)
+ goto out;
+ ret = initxattrs(inode, new_xattrs, fs_data);
+out:
+ for (; xattr_count > 0; xattr_count--)
+ kfree(new_xattrs[xattr_count - 1].value);
+ kfree(new_xattrs);
+ return (ret == -EOPNOTSUPP) ? 0 : ret;
+}
+EXPORT_SYMBOL(security_inode_init_security);
+
+/**
+ * security_inode_init_security_anon() - Initialize an anonymous inode
+ * @inode: the inode
+ * @name: the anonymous inode class
+ * @context_inode: an optional related inode
+ *
+ * Set up the incore security field for the new anonymous inode and return
+ * whether the inode creation is permitted by the security module or not.
+ *
+ * Return: Returns 0 on success, -EACCES if the security module denies the
+ * creation of this inode, or another -errno upon other errors.
+ */
+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);
+}
+
+#ifdef CONFIG_SECURITY_PATH
+/**
+ * security_path_mknod() - Check if creating a special file is allowed
+ * @dir: parent directory
+ * @dentry: new file
+ * @mode: new file mode
+ * @dev: device number
+ *
+ * Check permissions when creating a file. Note that this hook is called even
+ * if mknod operation is being done for a regular file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_path_mkdir() - Check if creating a new directory is allowed
+ * @dir: parent directory
+ * @dentry: new directory
+ * @mode: new directory mode
+ *
+ * Check permissions to create a new directory in the existing directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_path_rmdir() - Check if removing a directory is allowed
+ * @dir: parent directory
+ * @dentry: directory to remove
+ *
+ * Check the permission to remove a directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_unlink() - Check if removing a hard link is allowed
+ * @dir: parent directory
+ * @dentry: file
+ *
+ * Check the permission to remove a hard link to a file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_path_symlink() - Check if creating a symbolic link is allowed
+ * @dir: parent directory
+ * @dentry: symbolic link
+ * @old_name: file pathname
+ *
+ * Check the permission to create a symbolic link to a file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_link - Check if creating a hard link is allowed
+ * @old_dentry: existing file
+ * @new_dir: new parent directory
+ * @new_dentry: new link
+ *
+ * Check permission before creating a new hard link to a file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_rename() - Check if renaming a file is allowed
+ * @old_dir: parent directory of the old file
+ * @old_dentry: the old file
+ * @new_dir: parent directory of the new file
+ * @new_dentry: the new file
+ * @flags: flags
+ *
+ * Check for permission to rename a file or directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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;
+
+ return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
+ new_dentry, flags);
+}
+EXPORT_SYMBOL(security_path_rename);
+
+/**
+ * security_path_truncate() - Check if truncating a file is allowed
+ * @path: file
+ *
+ * Check permission before truncating the file indicated by path. Note that
+ * truncation permissions may also be checked based on already opened files,
+ * using the security_file_truncate() hook.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_chmod() - Check if changing the file's mode is allowed
+ * @path: file
+ * @mode: new mode
+ *
+ * Check for permission to change a mode of the file @path. The new mode is
+ * specified in @mode which is a bitmask of constants from
+ * <include/uapi/linux/stat.h>.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_chown() - Check if changing the file's owner/group is allowed
+ * @path: file
+ * @uid: file owner
+ * @gid: file group
+ *
+ * Check for permission to change owner/group of a file or directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_path_chroot() - Check if changing the root directory is allowed
+ * @path: directory
+ *
+ * Check for permission to change root directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_path_chroot(const struct path *path)
+{
+ return call_int_hook(path_chroot, 0, path);
+}
+#endif /* CONFIG_SECURITY_PATH */
+
+/**
+ * security_inode_create() - Check if creating a file is allowed
+ * @dir: the parent directory
+ * @dentry: the file being created
+ * @mode: requested file mode
+ *
+ * Check permission to create a regular file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_inode_link() - Check if creating a hard link is allowed
+ * @old_dentry: existing file
+ * @dir: new parent directory
+ * @new_dentry: new link
+ *
+ * Check permission before creating a new hard link to a file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_unlink() - Check if removing a hard link is allowed
+ * @dir: parent directory
+ * @dentry: file
+ *
+ * Check the permission to remove a hard link to a file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_symlink() - Check if creating a symbolic link is allowed
+ * @dir: parent directory
+ * @dentry: symbolic link
+ * @old_name: existing filename
+ *
+ * Check the permission to create a symbolic link to a file.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_mkdir() - Check if creation a new director is allowed
+ * @dir: parent directory
+ * @dentry: new directory
+ * @mode: new directory mode
+ *
+ * Check permissions to create a new directory in the existing directory
+ * associated with inode structure @dir.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_inode_rmdir() - Check if removing a directory is allowed
+ * @dir: parent directory
+ * @dentry: directory to be removed
+ *
+ * Check the permission to remove a directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_mknod() - Check if creating a special file is allowed
+ * @dir: parent directory
+ * @dentry: new file
+ * @mode: new file mode
+ * @dev: device number
+ *
+ * Check permissions when creating a special file (or a socket or a fifo file
+ * created via the mknod system call). Note that if mknod operation is being
+ * done for a regular file, then the create hook will be called and not this
+ * hook.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_rename() - Check if renaming a file is allowed
+ * @old_dir: parent directory of the old file
+ * @old_dentry: the old file
+ * @new_dir: parent directory of the new file
+ * @new_dentry: the new file
+ * @flags: flags
+ *
+ * Check for permission to rename a file or directory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_readlink() - Check if reading a symbolic link is allowed
+ * @dentry: link
+ *
+ * Check the permission to read the symbolic link.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_follow_link() - Check if following a symbolic link is allowed
+ * @dentry: link dentry
+ * @inode: link inode
+ * @rcu: true if in RCU-walk mode
+ *
+ * Check permission to follow a symbolic link when looking up a pathname. If
+ * @rcu is true, @inode is not stable.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_permission() - Check if accessing an inode is allowed
+ * @inode: inode
+ * @mask: access mask
+ *
+ * Check permission before accessing an inode. This hook is called by the
+ * existing Linux permission function, so a security module can use it to
+ * provide additional checking for existing Linux permission checks. Notice
+ * that this hook is called when a file is opened (as well as many other
+ * operations), whereas the file_security_ops permission hook is called when
+ * the actual read/write operations are performed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_setattr() - Check if setting file attributes is allowed
+ * @idmap: idmap of the mount
+ * @dentry: file
+ * @attr: new attributes
+ *
+ * Check permission before setting file attributes. Note that the kernel call
+ * to notify_change is performed from several locations, whenever file
+ * attributes change (such as when a file is truncated, chown/chmod operations,
+ * transferring disk quotas, etc).
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_inode_setattr(struct mnt_idmap *idmap,
+ 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(idmap, dentry, attr);
+}
+EXPORT_SYMBOL_GPL(security_inode_setattr);
+
+/**
+ * security_inode_getattr() - Check if getting file attributes is allowed
+ * @path: file
+ *
+ * Check permission before obtaining file attributes.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_setxattr() - Check if setting file xattrs is allowed
+ * @idmap: idmap of the mount
+ * @dentry: file
+ * @name: xattr name
+ * @value: xattr value
+ * @size: size of xattr value
+ * @flags: flags
+ *
+ * Check permission before setting the extended attributes.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_inode_setxattr(struct mnt_idmap *idmap,
+ 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, idmap, 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(idmap, dentry, name, value, size);
+}
+
+/**
+ * security_inode_set_acl() - Check if setting posix acls is allowed
+ * @idmap: idmap of the mount
+ * @dentry: file
+ * @acl_name: acl name
+ * @kacl: acl struct
+ *
+ * Check permission before setting posix acls, the posix acls in @kacl are
+ * identified by @acl_name.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_inode_set_acl(struct mnt_idmap *idmap,
+ struct dentry *dentry, const char *acl_name,
+ struct posix_acl *kacl)
+{
+ int ret;
+
+ if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
+ return 0;
+ ret = call_int_hook(inode_set_acl, 0, idmap, dentry, acl_name,
+ kacl);
+ if (ret)
+ return ret;
+ ret = ima_inode_set_acl(idmap, dentry, acl_name, kacl);
+ if (ret)
+ return ret;
+ return evm_inode_set_acl(idmap, dentry, acl_name, kacl);
+}
+
+/**
+ * security_inode_get_acl() - Check if reading posix acls is allowed
+ * @idmap: idmap of the mount
+ * @dentry: file
+ * @acl_name: acl name
+ *
+ * Check permission before getting osix acls, the posix acls are identified by
+ * @acl_name.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_inode_get_acl(struct mnt_idmap *idmap,
+ struct dentry *dentry, const char *acl_name)
+{
+ if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
+ return 0;
+ return call_int_hook(inode_get_acl, 0, idmap, dentry, acl_name);
+}
+
+/**
+ * security_inode_remove_acl() - Check if removing a posix acl is allowed
+ * @idmap: idmap of the mount
+ * @dentry: file
+ * @acl_name: acl name
+ *
+ * Check permission before removing posix acls, the posix acls are identified
+ * by @acl_name.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_inode_remove_acl(struct mnt_idmap *idmap,
+ struct dentry *dentry, const char *acl_name)
+{
+ int ret;
+
+ if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
+ return 0;
+ ret = call_int_hook(inode_remove_acl, 0, idmap, dentry, acl_name);
+ if (ret)
+ return ret;
+ ret = ima_inode_remove_acl(idmap, dentry, acl_name);
+ if (ret)
+ return ret;
+ return evm_inode_remove_acl(idmap, dentry, acl_name);
+}
+
+/**
+ * security_inode_post_setxattr() - Update the inode after a setxattr operation
+ * @dentry: file
+ * @name: xattr name
+ * @value: xattr value
+ * @size: xattr value size
+ * @flags: flags
+ *
+ * Update inode security field after successful setxattr operation.
+ */
+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);
+}
+
+/**
+ * security_inode_getxattr() - Check if xattr access is allowed
+ * @dentry: file
+ * @name: xattr name
+ *
+ * Check permission before obtaining the extended attributes identified by
+ * @name for @dentry.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_listxattr() - Check if listing xattrs is allowed
+ * @dentry: file
+ *
+ * Check permission before obtaining the list of extended attribute names for
+ * @dentry.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_inode_removexattr() - Check if removing an xattr is allowed
+ * @idmap: idmap of the mount
+ * @dentry: file
+ * @name: xattr name
+ *
+ * Check permission before removing the extended attribute identified by @name
+ * for @dentry.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_inode_removexattr(struct mnt_idmap *idmap,
+ 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, idmap, dentry, name);
+ if (ret == 1)
+ ret = cap_inode_removexattr(idmap, dentry, name);
+ if (ret)
+ return ret;
+ ret = ima_inode_removexattr(dentry, name);
+ if (ret)
+ return ret;
+ return evm_inode_removexattr(idmap, dentry, name);
+}
+
+/**
+ * security_inode_need_killpriv() - Check if security_inode_killpriv() required
+ * @dentry: associated dentry
+ *
+ * Called when an inode has been changed to determine if
+ * security_inode_killpriv() should be called.
+ *
+ * Return: Return <0 on error to abort the inode change operation, return 0 if
+ * security_inode_killpriv() does not need to be called, return >0 if
+ * security_inode_killpriv() does need to be called.
+ */
+int security_inode_need_killpriv(struct dentry *dentry)
+{
+ return call_int_hook(inode_need_killpriv, 0, dentry);
+}
+
+/**
+ * security_inode_killpriv() - The setuid bit is removed, update LSM state
+ * @idmap: idmap of the mount
+ * @dentry: associated dentry
+ *
+ * The @dentry's setuid bit is being removed. Remove similar security labels.
+ * Called with the dentry->d_inode->i_mutex held.
+ *
+ * Return: Return 0 on success. If error is returned, then the operation
+ * causing setuid bit removal is failed.
+ */
+int security_inode_killpriv(struct mnt_idmap *idmap,
+ struct dentry *dentry)
+{
+ return call_int_hook(inode_killpriv, 0, idmap, dentry);
+}
+
+/**
+ * security_inode_getsecurity() - Get the xattr security label of an inode
+ * @idmap: idmap of the mount
+ * @inode: inode
+ * @name: xattr name
+ * @buffer: security label buffer
+ * @alloc: allocation flag
+ *
+ * Retrieve a copy of the extended attribute representation of the security
+ * label associated with @name for @inode via @buffer. Note that @name is the
+ * remainder of the attribute name after the security prefix has been removed.
+ * @alloc is used to specify if the call should return a value via the buffer
+ * or just the value length.
+ *
+ * Return: Returns size of buffer on success.
+ */
+int security_inode_getsecurity(struct mnt_idmap *idmap,
+ 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(idmap, inode, name, buffer,
+ alloc);
+ if (rc != LSM_RET_DEFAULT(inode_getsecurity))
+ return rc;
+ }
+ return LSM_RET_DEFAULT(inode_getsecurity);
+}
+
+/**
+ * security_inode_setsecurity() - Set the xattr security label of an inode
+ * @inode: inode
+ * @name: xattr name
+ * @value: security label
+ * @size: length of security label
+ * @flags: flags
+ *
+ * Set the security label associated with @name for @inode from the extended
+ * attribute value @value. @size indicates the size of the @value in bytes.
+ * @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
+ * remainder of the attribute name after the security. prefix has been removed.
+ *
+ * Return: Returns 0 on success.
+ */
+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);
+}
+
+/**
+ * security_inode_listsecurity() - List the xattr security label names
+ * @inode: inode
+ * @buffer: buffer
+ * @buffer_size: size of buffer
+ *
+ * Copy the extended attribute names for the security labels associated with
+ * @inode into @buffer. The maximum size of @buffer is specified by
+ * @buffer_size. @buffer may be NULL to request the size of the buffer
+ * required.
+ *
+ * Return: Returns number of bytes used/required on success.
+ */
+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);
+
+/**
+ * security_inode_getsecid() - Get an inode's secid
+ * @inode: inode
+ * @secid: secid to return
+ *
+ * Get the secid associated with the node. In case of failure, @secid will be
+ * set to zero.
+ */
+void security_inode_getsecid(struct inode *inode, u32 *secid)
+{
+ call_void_hook(inode_getsecid, inode, secid);
+}
+
+/**
+ * security_inode_copy_up() - Create new creds for an overlayfs copy-up op
+ * @src: union dentry of copy-up file
+ * @new: newly created creds
+ *
+ * A file is about to be copied up from lower layer to upper layer of overlay
+ * filesystem. Security module can prepare a set of new creds and modify as
+ * need be and return new creds. Caller will switch to new creds temporarily to
+ * create new file and release newly allocated creds.
+ *
+ * Return: Returns 0 on success or a negative error code on error.
+ */
+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);
+
+/**
+ * security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
+ * @name: xattr name
+ *
+ * Filter the xattrs being copied up when a unioned file is copied up from a
+ * lower layer to the union/overlay layer. The caller is responsible for
+ * reading and writing the xattrs, this hook is merely a filter.
+ *
+ * Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
+ * if the security module does not know about attribute, or a negative
+ * error code to abort the 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 in case 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);
+
+/**
+ * security_kernfs_init_security() - Init LSM context for a kernfs node
+ * @kn_dir: parent kernfs node
+ * @kn: the kernfs node to initialize
+ *
+ * Initialize the security context of a newly created kernfs node based on its
+ * own and its parent's attributes.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_file_permission() - Check file permissions
+ * @file: file
+ * @mask: requested permissions
+ *
+ * Check file permissions before accessing an open file. This hook is called
+ * by various operations that read or write files. A security module can use
+ * this hook to perform additional checking on these operations, e.g. to
+ * revalidate permissions on use to support privilege bracketing or policy
+ * changes. Notice that this hook is used when the actual read/write
+ * operations are performed, whereas the inode_security_ops hook is called when
+ * a file is opened (as well as many other operations). Although this hook can
+ * be used to revalidate permissions for various system call operations that
+ * read or write files, it does not address the revalidation of permissions for
+ * memory-mapped files. Security modules must handle this separately if they
+ * need such revalidation.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_file_alloc() - Allocate and init a file's LSM blob
+ * @file: the file
+ *
+ * Allocate and attach a security structure to the file->f_security field. The
+ * security field is initialized to NULL when the structure is first created.
+ *
+ * Return: Return 0 if the hook is successful and permission is granted.
+ */
+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;
+}
+
+/**
+ * security_file_free() - Free a file's LSM blob
+ * @file: the file
+ *
+ * Deallocate and free any security structures stored in file->f_security.
+ */
+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);
+ }
+}
+
+/**
+ * security_file_ioctl() - Check if an ioctl is allowed
+ * @file: associated file
+ * @cmd: ioctl cmd
+ * @arg: ioctl arguments
+ *
+ * Check permission for an ioctl operation on @file. Note that @arg sometimes
+ * represents a user space pointer; in other cases, it may be a simple integer
+ * value. When @arg represents a user space pointer, it should never be used
+ * by the security module.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode
+ * @file: associated file
+ * @cmd: ioctl cmd
+ * @arg: ioctl arguments
+ *
+ * Compat version of security_file_ioctl() that correctly handles 32-bit
+ * processes running on 64-bit kernels.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_file_ioctl_compat(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return call_int_hook(file_ioctl_compat, 0, file, cmd, arg);
+}
+EXPORT_SYMBOL_GPL(security_file_ioctl_compat);
+
+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;
+}
+
+/**
+ * security_mmap_file() - Check if mmap'ing a file is allowed
+ * @file: file
+ * @prot: protection applied by the kernel
+ * @flags: flags
+ *
+ * Check permissions for a mmap operation. The @file may be NULL, e.g. if
+ * mapping anonymous memory.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_mmap_file(struct file *file, unsigned long prot,
+ unsigned long flags)
+{
+ unsigned long prot_adj = mmap_prot(file, prot);
+ int ret;
+
+ ret = call_int_hook(mmap_file, 0, file, prot, prot_adj, flags);
+ if (ret)
+ return ret;
+ return ima_file_mmap(file, prot, prot_adj, flags);
+}
+
+/**
+ * security_mmap_addr() - Check if mmap'ing an address is allowed
+ * @addr: address
+ *
+ * Check permissions for a mmap operation at @addr.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_mmap_addr(unsigned long addr)
+{
+ return call_int_hook(mmap_addr, 0, addr);
+}
+
+/**
+ * security_file_mprotect() - Check if changing memory protections is allowed
+ * @vma: memory region
+ * @reqprot: application requested protection
+ * @prot: protection applied by the kernel
+ *
+ * Check permissions before changing memory access permissions.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_file_lock() - Check if a file lock is allowed
+ * @file: file
+ * @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
+ *
+ * Check permission before performing file locking operations. Note the hook
+ * mediates both flock and fcntl style locks.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_file_lock(struct file *file, unsigned int cmd)
+{
+ return call_int_hook(file_lock, 0, file, cmd);
+}
+
+/**
+ * security_file_fcntl() - Check if fcntl() op is allowed
+ * @file: file
+ * @cmd: fcntl command
+ * @arg: command argument
+ *
+ * Check permission before allowing the file operation specified by @cmd from
+ * being performed on the file @file. Note that @arg sometimes represents a
+ * user space pointer; in other cases, it may be a simple integer value. When
+ * @arg represents a user space pointer, it should never be used by the
+ * security module.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ return call_int_hook(file_fcntl, 0, file, cmd, arg);
+}
+
+/**
+ * security_file_set_fowner() - Set the file owner info in the LSM blob
+ * @file: the file
+ *
+ * Save owner security information (typically from current->security) in
+ * file->f_security for later use by the send_sigiotask hook.
+ *
+ * Return: Returns 0 on success.
+ */
+void security_file_set_fowner(struct file *file)
+{
+ call_void_hook(file_set_fowner, file);
+}
+
+/**
+ * security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
+ * @tsk: target task
+ * @fown: signal sender
+ * @sig: signal to be sent, SIGIO is sent if 0
+ *
+ * Check permission for the file owner @fown to send SIGIO or SIGURG to the
+ * process @tsk. Note that this hook is sometimes called from interrupt. Note
+ * that the fown_struct, @fown, is never outside the context of a struct file,
+ * so the file structure (and associated security information) can always be
+ * obtained: container_of(fown, struct file, f_owner).
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_file_receive() - Check is receiving a file via IPC is allowed
+ * @file: file being received
+ *
+ * This hook allows security modules to control the ability of a process to
+ * receive an open file descriptor via socket IPC.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_file_receive(struct file *file)
+{
+ return call_int_hook(file_receive, 0, file);
+}
+
+/**
+ * security_file_open() - Save open() time state for late use by the LSM
+ * @file:
+ *
+ * Save open-time permission checking state for later use upon file_permission,
+ * and recheck access if anything has changed since inode_permission.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_file_truncate() - Check if truncating a file is allowed
+ * @file: file
+ *
+ * Check permission before truncating a file, i.e. using ftruncate. Note that
+ * truncation permission may also be checked based on the path, using the
+ * @path_truncate hook.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_file_truncate(struct file *file)
+{
+ return call_int_hook(file_truncate, 0, file);
+}
+
+/**
+ * security_task_alloc() - Allocate a task's LSM blob
+ * @task: the task
+ * @clone_flags: flags indicating what is being shared
+ *
+ * Handle allocation of task-related resources.
+ *
+ * Return: Returns a zero on success, negative values on failure.
+ */
+int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
+{
+ int rc = lsm_task_alloc(task);
+
+ if (rc)
+ return rc;
+ rc = call_int_hook(task_alloc, 0, task, clone_flags);
+ if (unlikely(rc))
+ security_task_free(task);
+ return rc;
+}
+
+/**
+ * security_task_free() - Free a task's LSM blob and related resources
+ * @task: task
+ *
+ * Handle release of task-related resources. Note that this can be called from
+ * interrupt context.
+ */
+void security_task_free(struct task_struct *task)
+{
+ call_void_hook(task_free, task);
+
+ kfree(task->security);
+ task->security = NULL;
+}
+
+/**
+ * security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
+ * @cred: credentials
+ * @gfp: gfp flags
+ *
+ * Only allocate sufficient memory and attach to @cred such that
+ * cred_transfer() will not get ENOMEM.
+ *
+ * Return: Returns 0 on success, negative values on failure.
+ */
+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;
+}
+
+/**
+ * security_cred_free() - Free the cred's LSM blob and associated resources
+ * @cred: credentials
+ *
+ * Deallocate and clear the cred->security field in a set of credentials.
+ */
+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;
+}
+
+/**
+ * security_prepare_creds() - Prepare a new set of credentials
+ * @new: new credentials
+ * @old: original credentials
+ * @gfp: gfp flags
+ *
+ * Prepare a new set of credentials by copying the data from the old set.
+ *
+ * Return: Returns 0 on success, negative values on failure.
+ */
+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;
+}
+
+/**
+ * security_transfer_creds() - Transfer creds
+ * @new: target credentials
+ * @old: original credentials
+ *
+ * Transfer data from original creds to new creds.
+ */
+void security_transfer_creds(struct cred *new, const struct cred *old)
+{
+ call_void_hook(cred_transfer, new, old);
+}
+
+/**
+ * security_cred_getsecid() - Get the secid from a set of credentials
+ * @c: credentials
+ * @secid: secid value
+ *
+ * Retrieve the security identifier of the cred structure @c. In case of
+ * failure, @secid will be set to zero.
+ */
+void security_cred_getsecid(const struct cred *c, u32 *secid)
+{
+ *secid = 0;
+ call_void_hook(cred_getsecid, c, secid);
+}
+EXPORT_SYMBOL(security_cred_getsecid);
+
+/**
+ * security_kernel_act_as() - Set the kernel credentials to act as secid
+ * @new: credentials
+ * @secid: secid
+ *
+ * Set the credentials for a kernel service to act as (subjective context).
+ * The current task must be the one that nominated @secid.
+ *
+ * Return: Returns 0 if successful.
+ */
+int security_kernel_act_as(struct cred *new, u32 secid)
+{
+ return call_int_hook(kernel_act_as, 0, new, secid);
+}
+
+/**
+ * security_kernel_create_files_as() - Set file creation context using an inode
+ * @new: target credentials
+ * @inode: reference inode
+ *
+ * Set the file creation context in a set of credentials to be the same as the
+ * objective context of the specified inode. The current task must be the one
+ * that nominated @inode.
+ *
+ * Return: Returns 0 if successful.
+ */
+int security_kernel_create_files_as(struct cred *new, struct inode *inode)
+{
+ return call_int_hook(kernel_create_files_as, 0, new, inode);
+}
+
+/**
+ * security_kernel_module_request() - Check is loading a module is allowed
+ * @kmod_name: module name
+ *
+ * Ability to trigger the kernel to automatically upcall to userspace for
+ * userspace to load a kernel module with the given name.
+ *
+ * Return: Returns 0 if successful.
+ */
+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);
+}
+
+/**
+ * security_kernel_read_file() - Read a file specified by userspace
+ * @file: file
+ * @id: file identifier
+ * @contents: trust if security_kernel_post_read_file() will be called
+ *
+ * Read a file specified by userspace.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_kernel_post_read_file() - Read a file specified by userspace
+ * @file: file
+ * @buf: file contents
+ * @size: size of file contents
+ * @id: file identifier
+ *
+ * Read a file specified by userspace. This must be paired with a prior call
+ * to security_kernel_read_file() call that indicated this hook would also be
+ * called, see security_kernel_read_file() for more information.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_kernel_load_data() - Load data provided by userspace
+ * @id: data identifier
+ * @contents: true if security_kernel_post_load_data() will be called
+ *
+ * Load data provided by userspace.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_kernel_post_load_data() - Load userspace data from a non-file source
+ * @buf: data
+ * @size: size of data
+ * @id: data identifier
+ * @description: text description of data, specific to the id value
+ *
+ * Load data provided by a non-file source (usually userspace buffer). This
+ * must be paired with a prior security_kernel_load_data() call that indicated
+ * this hook would also be called, see security_kernel_load_data() for more
+ * information.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_task_fix_setuid() - Update LSM with new user id attributes
+ * @new: updated credentials
+ * @old: credentials being replaced
+ * @flags: LSM_SETID_* flag values
+ *
+ * Update the module's state after setting one or more of the user identity
+ * attributes of the current process. The @flags parameter indicates which of
+ * the set*uid system calls invoked this hook. If @new is the set of
+ * credentials that will be installed. Modifications should be made to this
+ * rather than to @current->cred.
+ *
+ * Return: Returns 0 on success.
+ */
+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);
+}
+
+/**
+ * security_task_fix_setgid() - Update LSM with new group id attributes
+ * @new: updated credentials
+ * @old: credentials being replaced
+ * @flags: LSM_SETID_* flag value
+ *
+ * Update the module's state after setting one or more of the group identity
+ * attributes of the current process. The @flags parameter indicates which of
+ * the set*gid system calls invoked this hook. @new is the set of credentials
+ * that will be installed. Modifications should be made to this rather than to
+ * @current->cred.
+ *
+ * Return: Returns 0 on success.
+ */
+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);
+}
+
+/**
+ * security_task_fix_setgroups() - Update LSM with new supplementary groups
+ * @new: updated credentials
+ * @old: credentials being replaced
+ *
+ * Update the module's state after setting the supplementary group identity
+ * attributes of the current process. @new is the set of credentials that will
+ * be installed. Modifications should be made to this rather than to
+ * @current->cred.
+ *
+ * Return: Returns 0 on success.
+ */
+int security_task_fix_setgroups(struct cred *new, const struct cred *old)
+{
+ return call_int_hook(task_fix_setgroups, 0, new, old);
+}
+
+/**
+ * security_task_setpgid() - Check if setting the pgid is allowed
+ * @p: task being modified
+ * @pgid: new pgid
+ *
+ * Check permission before setting the process group identifier of the process
+ * @p to @pgid.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_setpgid(struct task_struct *p, pid_t pgid)
+{
+ return call_int_hook(task_setpgid, 0, p, pgid);
+}
+
+/**
+ * security_task_getpgid() - Check if getting the pgid is allowed
+ * @p: task
+ *
+ * Check permission before getting the process group identifier of the process
+ * @p.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_getpgid(struct task_struct *p)
+{
+ return call_int_hook(task_getpgid, 0, p);
+}
+
+/**
+ * security_task_getsid() - Check if getting the session id is allowed
+ * @p: task
+ *
+ * Check permission before getting the session identifier of the process @p.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_getsid(struct task_struct *p)
+{
+ return call_int_hook(task_getsid, 0, p);
+}
+
+/**
+ * security_current_getsecid_subj() - Get the current task's subjective secid
+ * @secid: secid value
+ *
+ * Retrieve the subjective security identifier of the current task and return
+ * it in @secid. In case of failure, @secid will be set to zero.
+ */
+void security_current_getsecid_subj(u32 *secid)
+{
+ *secid = 0;
+ call_void_hook(current_getsecid_subj, secid);
+}
+EXPORT_SYMBOL(security_current_getsecid_subj);
+
+/**
+ * security_task_getsecid_obj() - Get a task's objective secid
+ * @p: target task
+ * @secid: secid value
+ *
+ * Retrieve the objective security identifier of the task_struct in @p and
+ * return it in @secid. In case of failure, @secid will be set to zero.
+ */
+void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
+{
+ *secid = 0;
+ call_void_hook(task_getsecid_obj, p, secid);
+}
+EXPORT_SYMBOL(security_task_getsecid_obj);
+
+/**
+ * security_task_setnice() - Check if setting a task's nice value is allowed
+ * @p: target task
+ * @nice: nice value
+ *
+ * Check permission before setting the nice value of @p to @nice.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_setnice(struct task_struct *p, int nice)
+{
+ return call_int_hook(task_setnice, 0, p, nice);
+}
+
+/**
+ * security_task_setioprio() - Check if setting a task's ioprio is allowed
+ * @p: target task
+ * @ioprio: ioprio value
+ *
+ * Check permission before setting the ioprio value of @p to @ioprio.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_setioprio(struct task_struct *p, int ioprio)
+{
+ return call_int_hook(task_setioprio, 0, p, ioprio);
+}
+
+/**
+ * security_task_getioprio() - Check if getting a task's ioprio is allowed
+ * @p: task
+ *
+ * Check permission before getting the ioprio value of @p.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_getioprio(struct task_struct *p)
+{
+ return call_int_hook(task_getioprio, 0, p);
+}
+
+/**
+ * security_task_prlimit() - Check if get/setting resources limits is allowed
+ * @cred: current task credentials
+ * @tcred: target task credentials
+ * @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
+ *
+ * Check permission before getting and/or setting the resource limits of
+ * another task.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_task_setrlimit() - Check if setting a new rlimit value is allowed
+ * @p: target task's group leader
+ * @resource: resource whose limit is being set
+ * @new_rlim: new resource limit
+ *
+ * Check permission before setting the resource limits of process @p for
+ * @resource to @new_rlim. The old resource limit values can be examined by
+ * dereferencing (p->signal->rlim + resource).
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_task_setscheduler() - Check if setting sched policy/param is allowed
+ * @p: target task
+ *
+ * Check permission before setting scheduling policy and/or parameters of
+ * process @p.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_setscheduler(struct task_struct *p)
+{
+ return call_int_hook(task_setscheduler, 0, p);
+}
+
+/**
+ * security_task_getscheduler() - Check if getting scheduling info is allowed
+ * @p: target task
+ *
+ * Check permission before obtaining scheduling information for process @p.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_getscheduler(struct task_struct *p)
+{
+ return call_int_hook(task_getscheduler, 0, p);
+}
+
+/**
+ * security_task_movememory() - Check if moving memory is allowed
+ * @p: task
+ *
+ * Check permission before moving memory owned by process @p.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_task_movememory(struct task_struct *p)
+{
+ return call_int_hook(task_movememory, 0, p);
+}
+
+/**
+ * security_task_kill() - Check if sending a signal is allowed
+ * @p: target process
+ * @info: signal information
+ * @sig: signal value
+ * @cred: credentials of the signal sender, NULL if @current
+ *
+ * Check permission before sending signal @sig to @p. @info can be NULL, the
+ * constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
+ * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
+ * the kernel and should typically be permitted. SIGIO signals are handled
+ * separately by the send_sigiotask hook in file_security_ops.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_task_prctl() - Check if a prctl op is allowed
+ * @option: operation
+ * @arg2: argument
+ * @arg3: argument
+ * @arg4: argument
+ * @arg5: argument
+ *
+ * Check permission before performing a process control operation on the
+ * current process.
+ *
+ * Return: Return -ENOSYS if no-one wanted to handle this op, any other value
+ * to cause prctl() to return immediately with that value.
+ */
+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;
+}
+
+/**
+ * security_task_to_inode() - Set the security attributes of a task's inode
+ * @p: task
+ * @inode: inode
+ *
+ * Set the security attributes for an inode based on an associated task's
+ * security attributes, e.g. for /proc/pid inodes.
+ */
+void security_task_to_inode(struct task_struct *p, struct inode *inode)
+{
+ call_void_hook(task_to_inode, p, inode);
+}
+
+/**
+ * security_create_user_ns() - Check if creating a new userns is allowed
+ * @cred: prepared creds
+ *
+ * Check permission prior to creating a new user namespace.
+ *
+ * Return: Returns 0 if successful, otherwise < 0 error code.
+ */
+int security_create_user_ns(const struct cred *cred)
+{
+ return call_int_hook(userns_create, 0, cred);
+}
+
+/**
+ * security_ipc_permission() - Check if sysv ipc access is allowed
+ * @ipcp: ipc permission structure
+ * @flag: requested permissions
+ *
+ * Check permissions for access to IPC.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
+{
+ return call_int_hook(ipc_permission, 0, ipcp, flag);
+}
+
+/**
+ * security_ipc_getsecid() - Get the sysv ipc object's secid
+ * @ipcp: ipc permission structure
+ * @secid: secid pointer
+ *
+ * Get the secid associated with the ipc object. In case of failure, @secid
+ * will be set to zero.
+ */
+void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+{
+ *secid = 0;
+ call_void_hook(ipc_getsecid, ipcp, secid);
+}
+
+/**
+ * security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
+ * @msg: message structure
+ *
+ * Allocate and attach a security structure to the msg->security field. The
+ * security field is initialized to NULL when the structure is first created.
+ *
+ * Return: Return 0 if operation was successful and permission is granted.
+ */
+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;
+}
+
+/**
+ * security_msg_msg_free() - Free a sysv ipc message LSM blob
+ * @msg: message structure
+ *
+ * Deallocate the security structure for this message.
+ */
+void security_msg_msg_free(struct msg_msg *msg)
+{
+ call_void_hook(msg_msg_free_security, msg);
+ kfree(msg->security);
+ msg->security = NULL;
+}
+
+/**
+ * security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
+ * @msq: sysv ipc permission structure
+ *
+ * Allocate and attach a security structure to @msg. The security field is
+ * initialized to NULL when the structure is first created.
+ *
+ * Return: Returns 0 if operation was successful and permission is granted.
+ */
+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;
+}
+
+/**
+ * security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
+ * @msq: sysv ipc permission structure
+ *
+ * Deallocate security field @perm->security for the message queue.
+ */
+void security_msg_queue_free(struct kern_ipc_perm *msq)
+{
+ call_void_hook(msg_queue_free_security, msq);
+ kfree(msq->security);
+ msq->security = NULL;
+}
+
+/**
+ * security_msg_queue_associate() - Check if a msg queue operation is allowed
+ * @msq: sysv ipc permission structure
+ * @msqflg: operation flags
+ *
+ * Check permission when a message queue is requested through the msgget system
+ * call. This hook is only called when returning the message queue identifier
+ * for an existing message queue, not when a new message queue is created.
+ *
+ * Return: Return 0 if permission is granted.
+ */
+int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
+{
+ return call_int_hook(msg_queue_associate, 0, msq, msqflg);
+}
+
+/**
+ * security_msg_queue_msgctl() - Check if a msg queue operation is allowed
+ * @msq: sysv ipc permission structure
+ * @cmd: operation
+ *
+ * Check permission when a message control operation specified by @cmd is to be
+ * performed on the message queue with permissions.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
+{
+ return call_int_hook(msg_queue_msgctl, 0, msq, cmd);
+}
+
+/**
+ * security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
+ * @msq: sysv ipc permission structure
+ * @msg: message
+ * @msqflg: operation flags
+ *
+ * Check permission before a message, @msg, is enqueued on the message queue
+ * with permissions specified in @msq.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
+ * @msq: sysv ipc permission structure
+ * @msg: message
+ * @target: target task
+ * @type: type of message requested
+ * @mode: operation flags
+ *
+ * Check permission before a message, @msg, is removed from the message queue.
+ * The @target task structure contains a pointer to the process that will be
+ * receiving the message (not equal to the current process when inline receives
+ * are being performed).
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_shm_alloc() - Allocate a sysv shm LSM blob
+ * @shp: sysv ipc permission structure
+ *
+ * Allocate and attach a security structure to the @shp security field. The
+ * security field is initialized to NULL when the structure is first created.
+ *
+ * Return: Returns 0 if operation was successful and permission is granted.
+ */
+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;
+}
+
+/**
+ * security_shm_free() - Free a sysv shm LSM blob
+ * @shp: sysv ipc permission structure
+ *
+ * Deallocate the security structure @perm->security for the memory segment.
+ */
+void security_shm_free(struct kern_ipc_perm *shp)
+{
+ call_void_hook(shm_free_security, shp);
+ kfree(shp->security);
+ shp->security = NULL;
+}
+
+/**
+ * security_shm_associate() - Check if a sysv shm operation is allowed
+ * @shp: sysv ipc permission structure
+ * @shmflg: operation flags
+ *
+ * Check permission when a shared memory region is requested through the shmget
+ * system call. This hook is only called when returning the shared memory
+ * region identifier for an existing region, not when a new shared memory
+ * region is created.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
+{
+ return call_int_hook(shm_associate, 0, shp, shmflg);
+}
+
+/**
+ * security_shm_shmctl() - Check if a sysv shm operation is allowed
+ * @shp: sysv ipc permission structure
+ * @cmd: operation
+ *
+ * Check permission when a shared memory control operation specified by @cmd is
+ * to be performed on the shared memory region with permissions in @shp.
+ *
+ * Return: Return 0 if permission is granted.
+ */
+int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
+{
+ return call_int_hook(shm_shmctl, 0, shp, cmd);
+}
+
+/**
+ * security_shm_shmat() - Check if a sysv shm attach operation is allowed
+ * @shp: sysv ipc permission structure
+ * @shmaddr: address of memory region to attach
+ * @shmflg: operation flags
+ *
+ * Check permissions prior to allowing the shmat system call to attach the
+ * shared memory segment with permissions @shp to the data segment of the
+ * calling process. The attaching address is specified by @shmaddr.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_shm_shmat(struct kern_ipc_perm *shp,
+ char __user *shmaddr, int shmflg)
+{
+ return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
+}
+
+/**
+ * security_sem_alloc() - Allocate a sysv semaphore LSM blob
+ * @sma: sysv ipc permission structure
+ *
+ * Allocate and attach a security structure to the @sma security field. The
+ * security field is initialized to NULL when the structure is first created.
+ *
+ * Return: Returns 0 if operation was successful and permission is granted.
+ */
+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;
+}
+
+/**
+ * security_sem_free() - Free a sysv semaphore LSM blob
+ * @sma: sysv ipc permission structure
+ *
+ * Deallocate security structure @sma->security for the semaphore.
+ */
+void security_sem_free(struct kern_ipc_perm *sma)
+{
+ call_void_hook(sem_free_security, sma);
+ kfree(sma->security);
+ sma->security = NULL;
+}
+
+/**
+ * security_sem_associate() - Check if a sysv semaphore operation is allowed
+ * @sma: sysv ipc permission structure
+ * @semflg: operation flags
+ *
+ * Check permission when a semaphore is requested through the semget system
+ * call. This hook is only called when returning the semaphore identifier for
+ * an existing semaphore, not when a new one must be created.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
+{
+ return call_int_hook(sem_associate, 0, sma, semflg);
+}
+
+/**
+ * security_sem_semctl() - Check if a sysv semaphore operation is allowed
+ * @sma: sysv ipc permission structure
+ * @cmd: operation
+ *
+ * Check permission when a semaphore operation specified by @cmd is to be
+ * performed on the semaphore.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
+{
+ return call_int_hook(sem_semctl, 0, sma, cmd);
+}
+
+/**
+ * security_sem_semop() - Check if a sysv semaphore operation is allowed
+ * @sma: sysv ipc permission structure
+ * @sops: operations to perform
+ * @nsops: number of operations
+ * @alter: flag indicating changes will be made
+ *
+ * Check permissions before performing operations on members of the semaphore
+ * set. If the @alter flag is nonzero, the semaphore set may be modified.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_d_instantiate() - Populate an inode's LSM state based on a dentry
+ * @dentry: dentry
+ * @inode: inode
+ *
+ * Fill in @inode security information for a @dentry if allowed.
+ */
+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);
+
+/**
+ * security_getprocattr() - Read an attribute for a task
+ * @p: the task
+ * @lsm: LSM name
+ * @name: attribute name
+ * @value: attribute value
+ *
+ * Read attribute @name for task @p and store it into @value if allowed.
+ *
+ * Return: Returns the length of @value on success, a negative value otherwise.
+ */
+int security_getprocattr(struct task_struct *p, const char *lsm,
+ const char *name, char **value)
+{
+ struct security_hook_list *hp;
+
+ hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
+ if (lsm != NULL && strcmp(lsm, hp->lsm))
+ continue;
+ return hp->hook.getprocattr(p, name, value);
+ }
+ return LSM_RET_DEFAULT(getprocattr);
+}
+
+/**
+ * security_setprocattr() - Set an attribute for a task
+ * @lsm: LSM name
+ * @name: attribute name
+ * @value: attribute value
+ * @size: attribute value size
+ *
+ * Write (set) the current task's attribute @name to @value, size @size if
+ * allowed.
+ *
+ * Return: Returns bytes written on success, a negative value otherwise.
+ */
+int security_setprocattr(const char *lsm, const char *name, void *value,
+ size_t size)
+{
+ struct security_hook_list *hp;
+
+ hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
+ if (lsm != NULL && strcmp(lsm, hp->lsm))
+ continue;
+ return hp->hook.setprocattr(name, value, size);
+ }
+ return LSM_RET_DEFAULT(setprocattr);
+}
+
+/**
+ * security_netlink_send() - Save info and check if netlink sending is allowed
+ * @sk: sending socket
+ * @skb: netlink message
+ *
+ * Save security information for a netlink message so that permission checking
+ * can be performed when the message is processed. The security information
+ * can be saved using the eff_cap field of the netlink_skb_parms structure.
+ * Also may be used to provide fine grained control over message transmission.
+ *
+ * Return: Returns 0 if the information was successfully saved and message is
+ * allowed to be transmitted.
+ */
+int security_netlink_send(struct sock *sk, struct sk_buff *skb)
+{
+ return call_int_hook(netlink_send, 0, sk, skb);
+}
+
+/**
+ * security_ismaclabel() - Check is the named attribute is a MAC label
+ * @name: full extended attribute name
+ *
+ * Check if the extended attribute specified by @name represents a MAC label.
+ *
+ * Return: Returns 1 if name is a MAC attribute otherwise returns 0.
+ */
+int security_ismaclabel(const char *name)
+{
+ return call_int_hook(ismaclabel, 0, name);
+}
+EXPORT_SYMBOL(security_ismaclabel);
+
+/**
+ * security_secid_to_secctx() - Convert a secid to a secctx
+ * @secid: secid
+ * @secdata: secctx
+ * @seclen: secctx length
+ *
+ * Convert secid to security context. If @secdata is NULL the length of the
+ * result will be returned in @seclen, but no @secdata will be returned. This
+ * does mean that the length could change between calls to check the length and
+ * the next call which actually allocates and returns the @secdata.
+ *
+ * Return: Return 0 on success, error on failure.
+ */
+int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
+{
+ struct security_hook_list *hp;
+ int rc;
+
+ /*
+ * Currently, only one LSM can implement secid_to_secctx (i.e this
+ * LSM hook is not "stackable").
+ */
+ hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
+ rc = hp->hook.secid_to_secctx(secid, secdata, seclen);
+ if (rc != LSM_RET_DEFAULT(secid_to_secctx))
+ return rc;
+ }
+
+ return LSM_RET_DEFAULT(secid_to_secctx);
+}
+EXPORT_SYMBOL(security_secid_to_secctx);
+
+/**
+ * security_secctx_to_secid() - Convert a secctx to a secid
+ * @secdata: secctx
+ * @seclen: length of secctx
+ * @secid: secid
+ *
+ * Convert security context to secid.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
+{
+ *secid = 0;
+ return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid);
+}
+EXPORT_SYMBOL(security_secctx_to_secid);
+
+/**
+ * security_release_secctx() - Free a secctx buffer
+ * @secdata: secctx
+ * @seclen: length of secctx
+ *
+ * Release the security context.
+ */
+void security_release_secctx(char *secdata, u32 seclen)
+{
+ call_void_hook(release_secctx, secdata, seclen);
+}
+EXPORT_SYMBOL(security_release_secctx);
+
+/**
+ * security_inode_invalidate_secctx() - Invalidate an inode's security label
+ * @inode: inode
+ *
+ * Notify the security module that it must revalidate the security context of
+ * an inode.
+ */
+void security_inode_invalidate_secctx(struct inode *inode)
+{
+ call_void_hook(inode_invalidate_secctx, inode);
+}
+EXPORT_SYMBOL(security_inode_invalidate_secctx);
+
+/**
+ * security_inode_notifysecctx() - Nofify the LSM of an inode's security label
+ * @inode: inode
+ * @ctx: secctx
+ * @ctxlen: length of secctx
+ *
+ * Notify the security module of what the security context of an inode should
+ * be. Initializes the incore security context managed by the security module
+ * for this inode. Example usage: NFS client invokes this hook to initialize
+ * the security context in its incore inode to the value provided by the server
+ * for the file when the server returned the file's attributes to the client.
+ * Must be called with inode->i_mutex locked.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+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);
+
+/**
+ * security_inode_setsecctx() - Change the security label of an inode
+ * @dentry: inode
+ * @ctx: secctx
+ * @ctxlen: length of secctx
+ *
+ * Change the security context of an inode. Updates the incore security
+ * context managed by the security module and invokes the fs code as needed
+ * (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
+ * context. Example usage: NFS server invokes this hook to change the security
+ * context in its incore inode and on the backing filesystem to a value
+ * provided by the client on a SETATTR operation. Must be called with
+ * inode->i_mutex locked.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+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);
+
+/**
+ * security_inode_getsecctx() - Get the security label of an inode
+ * @inode: inode
+ * @ctx: secctx
+ * @ctxlen: length of secctx
+ *
+ * On success, returns 0 and fills out @ctx and @ctxlen with the security
+ * context for the given @inode.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
+{
+ return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen);
+}
+EXPORT_SYMBOL(security_inode_getsecctx);
+
+#ifdef CONFIG_WATCH_QUEUE
+/**
+ * security_post_notification() - Check if a watch notification can be posted
+ * @w_cred: credentials of the task that set the watch
+ * @cred: credentials of the task which triggered the watch
+ * @n: the notification
+ *
+ * Check to see if a watch notification can be posted to a particular queue.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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
+/**
+ * security_watch_key() - Check if a task is allowed to watch for key events
+ * @key: the key to watch
+ *
+ * Check to see if a process is allowed to watch for event notifications from
+ * a key or keyring.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_watch_key(struct key *key)
+{
+ return call_int_hook(watch_key, 0, key);
+}
+#endif /* CONFIG_KEY_NOTIFICATIONS */
+
+#ifdef CONFIG_SECURITY_NETWORK
+/**
+ * security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
+ * @sock: originating sock
+ * @other: peer sock
+ * @newsk: new sock
+ *
+ * Check permissions before establishing a Unix domain stream connection
+ * between @sock and @other.
+ *
+ * The @unix_stream_connect and @unix_may_send hooks were necessary because
+ * Linux provides an alternative to the conventional file name space for Unix
+ * domain sockets. Whereas binding and connecting to sockets in the file name
+ * space is mediated by the typical file permissions (and caught by the mknod
+ * and permission hooks in inode_security_ops), binding and connecting to
+ * sockets in the abstract name space is completely unmediated. Sufficient
+ * control of Unix domain sockets in the abstract name space isn't possible
+ * using only the socket layer hooks, since we need to know the actual target
+ * socket, which is not looked up until we are inside the af_unix code.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_unix_may_send() - Check if AF_UNIX socket can send datagrams
+ * @sock: originating sock
+ * @other: peer sock
+ *
+ * Check permissions before connecting or sending datagrams from @sock to
+ * @other.
+ *
+ * The @unix_stream_connect and @unix_may_send hooks were necessary because
+ * Linux provides an alternative to the conventional file name space for Unix
+ * domain sockets. Whereas binding and connecting to sockets in the file name
+ * space is mediated by the typical file permissions (and caught by the mknod
+ * and permission hooks in inode_security_ops), binding and connecting to
+ * sockets in the abstract name space is completely unmediated. Sufficient
+ * control of Unix domain sockets in the abstract name space isn't possible
+ * using only the socket layer hooks, since we need to know the actual target
+ * socket, which is not looked up until we are inside the af_unix code.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_socket_create() - Check if creating a new socket is allowed
+ * @family: protocol family
+ * @type: communications type
+ * @protocol: requested protocol
+ * @kern: set to 1 if a kernel socket is requested
+ *
+ * Check permissions prior to creating a new socket.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_create(int family, int type, int protocol, int kern)
+{
+ return call_int_hook(socket_create, 0, family, type, protocol, kern);
+}
+
+/**
+ * security_socket_post_create() - Initialize a newly created socket
+ * @sock: socket
+ * @family: protocol family
+ * @type: communications type
+ * @protocol: requested protocol
+ * @kern: set to 1 if a kernel socket is requested
+ *
+ * This hook allows a module to update or allocate a per-socket security
+ * structure. Note that the security field was not added directly to the socket
+ * structure, but rather, the socket security information is stored in the
+ * associated inode. Typically, the inode alloc_security hook will allocate
+ * and attach security information to SOCK_INODE(sock)->i_security. This hook
+ * may be used to update the SOCK_INODE(sock)->i_security field with additional
+ * information that wasn't available when the inode was allocated.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_socket_socketpair() - Check if creating a socketpair is allowed
+ * @socka: first socket
+ * @sockb: second socket
+ *
+ * Check permissions before creating a fresh pair of sockets.
+ *
+ * Return: Returns 0 if permission is granted and the connection was
+ * established.
+ */
+int security_socket_socketpair(struct socket *socka, struct socket *sockb)
+{
+ return call_int_hook(socket_socketpair, 0, socka, sockb);
+}
+EXPORT_SYMBOL(security_socket_socketpair);
+
+/**
+ * security_socket_bind() - Check if a socket bind operation is allowed
+ * @sock: socket
+ * @address: requested bind address
+ * @addrlen: length of address
+ *
+ * Check permission before socket protocol layer bind operation is performed
+ * and the socket @sock is bound to the address specified in the @address
+ * parameter.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_bind(struct socket *sock,
+ struct sockaddr *address, int addrlen)
+{
+ return call_int_hook(socket_bind, 0, sock, address, addrlen);
+}
+
+/**
+ * security_socket_connect() - Check if a socket connect operation is allowed
+ * @sock: socket
+ * @address: address of remote connection point
+ * @addrlen: length of address
+ *
+ * Check permission before socket protocol layer connect operation attempts to
+ * connect socket @sock to a remote address, @address.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_connect(struct socket *sock,
+ struct sockaddr *address, int addrlen)
+{
+ return call_int_hook(socket_connect, 0, sock, address, addrlen);
+}
+
+/**
+ * security_socket_listen() - Check if a socket is allowed to listen
+ * @sock: socket
+ * @backlog: connection queue size
+ *
+ * Check permission before socket protocol layer listen operation.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_listen(struct socket *sock, int backlog)
+{
+ return call_int_hook(socket_listen, 0, sock, backlog);
+}
+
+/**
+ * security_socket_accept() - Check if a socket is allowed to accept connections
+ * @sock: listening socket
+ * @newsock: newly creation connection socket
+ *
+ * Check permission before accepting a new connection. Note that the new
+ * socket, @newsock, has been created and some information copied to it, but
+ * the accept operation has not actually been performed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_accept(struct socket *sock, struct socket *newsock)
+{
+ return call_int_hook(socket_accept, 0, sock, newsock);
+}
+
+/**
+ * security_socket_sendmsg() - Check is sending a message is allowed
+ * @sock: sending socket
+ * @msg: message to send
+ * @size: size of message
+ *
+ * Check permission before transmitting a message to another socket.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
+{
+ return call_int_hook(socket_sendmsg, 0, sock, msg, size);
+}
+
+/**
+ * security_socket_recvmsg() - Check if receiving a message is allowed
+ * @sock: receiving socket
+ * @msg: message to receive
+ * @size: size of message
+ * @flags: operational flags
+ *
+ * Check permission before receiving a message from a socket.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+}
+
+/**
+ * security_socket_getsockname() - Check if reading the socket addr is allowed
+ * @sock: socket
+ *
+ * Check permission before reading the local address (name) of the socket
+ * object.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_getsockname(struct socket *sock)
+{
+ return call_int_hook(socket_getsockname, 0, sock);
+}
+
+/**
+ * security_socket_getpeername() - Check if reading the peer's addr is allowed
+ * @sock: socket
+ *
+ * Check permission before the remote address (name) of a socket object.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_getpeername(struct socket *sock)
+{
+ return call_int_hook(socket_getpeername, 0, sock);
+}
+
+/**
+ * security_socket_getsockopt() - Check if reading a socket option is allowed
+ * @sock: socket
+ * @level: option's protocol level
+ * @optname: option name
+ *
+ * Check permissions before retrieving the options associated with socket
+ * @sock.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_getsockopt(struct socket *sock, int level, int optname)
+{
+ return call_int_hook(socket_getsockopt, 0, sock, level, optname);
+}
+
+/**
+ * security_socket_setsockopt() - Check if setting a socket option is allowed
+ * @sock: socket
+ * @level: option's protocol level
+ * @optname: option name
+ *
+ * Check permissions before setting the options associated with socket @sock.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_setsockopt(struct socket *sock, int level, int optname)
+{
+ return call_int_hook(socket_setsockopt, 0, sock, level, optname);
+}
+
+/**
+ * security_socket_shutdown() - Checks if shutting down the socket is allowed
+ * @sock: socket
+ * @how: flag indicating how sends and receives are handled
+ *
+ * Checks permission before all or part of a connection on the socket @sock is
+ * shut down.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_socket_shutdown(struct socket *sock, int how)
+{
+ return call_int_hook(socket_shutdown, 0, sock, how);
+}
+
+/**
+ * security_sock_rcv_skb() - Check if an incoming network packet is allowed
+ * @sk: destination sock
+ * @skb: incoming packet
+ *
+ * Check permissions on incoming network packets. This hook is distinct from
+ * Netfilter's IP input hooks since it is the first time that the incoming
+ * sk_buff @skb has been associated with a particular socket, @sk. Must not
+ * sleep inside this hook because some callers hold spinlocks.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_socket_getpeersec_stream() - Get the remote peer label
+ * @sock: socket
+ * @optval: destination buffer
+ * @optlen: size of peer label copied into the buffer
+ * @len: maximum size of the destination buffer
+ *
+ * This hook allows the security module to provide peer socket security state
+ * for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
+ * For tcp sockets this can be meaningful if the socket is associated with an
+ * ipsec SA.
+ *
+ * Return: Returns 0 if all is well, otherwise, typical getsockopt return
+ * values.
+ */
+int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
+ sockptr_t optlen, unsigned int len)
+{
+ return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
+ optval, optlen, len);
+}
+
+/**
+ * security_socket_getpeersec_dgram() - Get the remote peer label
+ * @sock: socket
+ * @skb: datagram packet
+ * @secid: remote peer label secid
+ *
+ * This hook allows the security module to provide peer socket security state
+ * for udp sockets on a per-packet basis to userspace via getsockopt
+ * SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
+ * option via getsockopt. It can then retrieve the security state returned by
+ * this hook for a packet via the SCM_SECURITY ancillary message type.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_socket_getpeersec_dgram(struct socket *sock,
+ struct sk_buff *skb, u32 *secid)
+{
+ return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
+ skb, secid);
+}
+EXPORT_SYMBOL(security_socket_getpeersec_dgram);
+
+/**
+ * security_sk_alloc() - Allocate and initialize a sock's LSM blob
+ * @sk: sock
+ * @family: protocol family
+ * @priority: gfp flags
+ *
+ * Allocate and attach a security structure to the sk->sk_security field, which
+ * is used to copy security attributes between local stream sockets.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
+{
+ return call_int_hook(sk_alloc_security, 0, sk, family, priority);
+}
+
+/**
+ * security_sk_free() - Free the sock's LSM blob
+ * @sk: sock
+ *
+ * Deallocate security structure.
+ */
+void security_sk_free(struct sock *sk)
+{
+ call_void_hook(sk_free_security, sk);
+}
+
+/**
+ * security_sk_clone() - Clone a sock's LSM state
+ * @sk: original sock
+ * @newsk: target sock
+ *
+ * Clone/copy security structure.
+ */
+void security_sk_clone(const struct sock *sk, struct sock *newsk)
+{
+ call_void_hook(sk_clone_security, sk, newsk);
+}
+EXPORT_SYMBOL(security_sk_clone);
+
+/**
+ * security_sk_classify_flow() - Set a flow's secid based on socket
+ * @sk: original socket
+ * @flic: target flow
+ *
+ * Set the target flow's secid to socket's secid.
+ */
+void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
+{
+ call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
+}
+EXPORT_SYMBOL(security_sk_classify_flow);
+
+/**
+ * security_req_classify_flow() - Set a flow's secid based on request_sock
+ * @req: request_sock
+ * @flic: target flow
+ *
+ * Sets @flic's secid to @req's secid.
+ */
+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);
+
+/**
+ * security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
+ * @sk: sock being grafted
+ * @parent: target parent socket
+ *
+ * Sets @parent's inode secid to @sk's secid and update @sk with any necessary
+ * LSM state from @parent.
+ */
+void security_sock_graft(struct sock *sk, struct socket *parent)
+{
+ call_void_hook(sock_graft, sk, parent);
+}
+EXPORT_SYMBOL(security_sock_graft);
+
+/**
+ * security_inet_conn_request() - Set request_sock state using incoming connect
+ * @sk: parent listening sock
+ * @skb: incoming connection
+ * @req: new request_sock
+ *
+ * Initialize the @req LSM state based on @sk and the incoming connect in @skb.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_inet_csk_clone() - Set new sock LSM state based on request_sock
+ * @newsk: new sock
+ * @req: connection request_sock
+ *
+ * Set that LSM state of @sock using the LSM state from @req.
+ */
+void security_inet_csk_clone(struct sock *newsk,
+ const struct request_sock *req)
+{
+ call_void_hook(inet_csk_clone, newsk, req);
+}
+
+/**
+ * security_inet_conn_established() - Update sock's LSM state with connection
+ * @sk: sock
+ * @skb: connection packet
+ *
+ * Update @sock's LSM state to represent a new connection from @skb.
+ */
+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);
+
+/**
+ * security_secmark_relabel_packet() - Check if setting a secmark is allowed
+ * @secid: new secmark value
+ *
+ * Check if the process should be allowed to relabel packets to @secid.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_secmark_relabel_packet(u32 secid)
+{
+ return call_int_hook(secmark_relabel_packet, 0, secid);
+}
+EXPORT_SYMBOL(security_secmark_relabel_packet);
+
+/**
+ * security_secmark_refcount_inc() - Increment the secmark labeling rule count
+ *
+ * Tells the LSM to increment the number of secmark labeling rules loaded.
+ */
+void security_secmark_refcount_inc(void)
+{
+ call_void_hook(secmark_refcount_inc);
+}
+EXPORT_SYMBOL(security_secmark_refcount_inc);
+
+/**
+ * security_secmark_refcount_dec() - Decrement the secmark labeling rule count
+ *
+ * Tells the LSM to decrement the number of secmark labeling rules loaded.
+ */
+void security_secmark_refcount_dec(void)
+{
+ call_void_hook(secmark_refcount_dec);
+}
+EXPORT_SYMBOL(security_secmark_refcount_dec);
+
+/**
+ * security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
+ * @security: pointer to the LSM blob
+ *
+ * This hook allows a module to allocate a security structure for a TUN device,
+ * returning the pointer in @security.
+ *
+ * Return: Returns a zero on success, negative values on failure.
+ */
+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);
+
+/**
+ * security_tun_dev_free_security() - Free a TUN device LSM blob
+ * @security: LSM blob
+ *
+ * This hook allows a module to free the security structure for a TUN device.
+ */
+void security_tun_dev_free_security(void *security)
+{
+ call_void_hook(tun_dev_free_security, security);
+}
+EXPORT_SYMBOL(security_tun_dev_free_security);
+
+/**
+ * security_tun_dev_create() - Check if creating a TUN device is allowed
+ *
+ * Check permissions prior to creating a new TUN device.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_tun_dev_create(void)
+{
+ return call_int_hook(tun_dev_create, 0);
+}
+EXPORT_SYMBOL(security_tun_dev_create);
+
+/**
+ * security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
+ * @security: TUN device LSM blob
+ *
+ * Check permissions prior to attaching to a TUN device queue.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_tun_dev_attach() - Update TUN device LSM state on attach
+ * @sk: associated sock
+ * @security: TUN device LSM blob
+ *
+ * This hook can be used by the module to update any security state associated
+ * with the TUN device's sock structure.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_tun_dev_open() - Update TUN device LSM state on open
+ * @security: TUN device LSM blob
+ *
+ * This hook can be used by the module to update any security state associated
+ * with the TUN device's security structure.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_tun_dev_open(void *security)
+{
+ return call_int_hook(tun_dev_open, 0, security);
+}
+EXPORT_SYMBOL(security_tun_dev_open);
+
+/**
+ * security_sctp_assoc_request() - Update the LSM on a SCTP association req
+ * @asoc: SCTP association
+ * @skb: packet requesting the association
+ *
+ * Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_sctp_assoc_request(struct sctp_association *asoc,
+ struct sk_buff *skb)
+{
+ return call_int_hook(sctp_assoc_request, 0, asoc, skb);
+}
+EXPORT_SYMBOL(security_sctp_assoc_request);
+
+/**
+ * security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
+ * @sk: socket
+ * @optname: SCTP option to validate
+ * @address: list of IP addresses to validate
+ * @addrlen: length of the address list
+ *
+ * Validiate permissions required for each address associated with sock @sk.
+ * Depending on @optname, the addresses will be treated as either a connect or
+ * bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
+ * sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+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);
+
+/**
+ * security_sctp_sk_clone() - Clone a SCTP sock's LSM state
+ * @asoc: SCTP association
+ * @sk: original sock
+ * @newsk: target sock
+ *
+ * Called whenever a new socket is created by accept(2) (i.e. a TCP style
+ * socket) or when a socket is 'peeled off' e.g userspace calls
+ * sctp_peeloff(3).
+ */
+void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
+ struct sock *newsk)
+{
+ call_void_hook(sctp_sk_clone, asoc, sk, newsk);
+}
+EXPORT_SYMBOL(security_sctp_sk_clone);
+
+/**
+ * security_sctp_assoc_established() - Update LSM state when assoc established
+ * @asoc: SCTP association
+ * @skb: packet establishing the association
+ *
+ * Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
+ * security module.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_sctp_assoc_established(struct sctp_association *asoc,
+ struct sk_buff *skb)
+{
+ return call_int_hook(sctp_assoc_established, 0, asoc, skb);
+}
+EXPORT_SYMBOL(security_sctp_assoc_established);
+
+/**
+ * security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
+ * @sk: the owning MPTCP socket
+ * @ssk: the new subflow
+ *
+ * Update the labeling for the given MPTCP subflow, to match the one of the
+ * owning MPTCP socket. This hook has to be called after the socket creation and
+ * initialization via the security_socket_create() and
+ * security_socket_post_create() LSM hooks.
+ *
+ * Return: Returns 0 on success or a negative error code on failure.
+ */
+int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
+{
+ return call_int_hook(mptcp_add_subflow, 0, sk, ssk);
+}
+
+#endif /* CONFIG_SECURITY_NETWORK */
+
+#ifdef CONFIG_SECURITY_INFINIBAND
+/**
+ * security_ib_pkey_access() - Check if access to an IB pkey is allowed
+ * @sec: LSM blob
+ * @subnet_prefix: subnet prefix of the port
+ * @pkey: IB pkey
+ *
+ * Check permission to access a pkey when modifying a QP.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
+ * @sec: LSM blob
+ * @dev_name: IB device name
+ * @port_num: port number
+ *
+ * Check permissions to send and receive SMPs on a end port.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_ib_alloc_security() - Allocate an Infiniband LSM blob
+ * @sec: LSM blob
+ *
+ * Allocate a security structure for Infiniband objects.
+ *
+ * Return: Returns 0 on success, non-zero on failure.
+ */
+int security_ib_alloc_security(void **sec)
+{
+ return call_int_hook(ib_alloc_security, 0, sec);
+}
+EXPORT_SYMBOL(security_ib_alloc_security);
+
+/**
+ * security_ib_free_security() - Free an Infiniband LSM blob
+ * @sec: LSM blob
+ *
+ * Deallocate an Infiniband security structure.
+ */
+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
+/**
+ * security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
+ * @ctxp: xfrm security context being added to the SPD
+ * @sec_ctx: security label provided by userspace
+ * @gfp: gfp flags
+ *
+ * Allocate a security structure to the xp->security field; the security field
+ * is initialized to NULL when the xfrm_policy is allocated.
+ *
+ * Return: Return 0 if operation was successful.
+ */
+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);
+
+/**
+ * security_xfrm_policy_clone() - Clone xfrm policy LSM state
+ * @old_ctx: xfrm security context
+ * @new_ctxp: target xfrm security context
+ *
+ * Allocate a security structure in new_ctxp that contains the information from
+ * the old_ctx structure.
+ *
+ * Return: Return 0 if operation was successful.
+ */
+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);
+}
+
+/**
+ * security_xfrm_policy_free() - Free a xfrm security context
+ * @ctx: xfrm security context
+ *
+ * Free LSM resources associated with @ctx.
+ */
+void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
+{
+ call_void_hook(xfrm_policy_free_security, ctx);
+}
+EXPORT_SYMBOL(security_xfrm_policy_free);
+
+/**
+ * security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
+ * @ctx: xfrm security context
+ *
+ * Authorize deletion of a SPD entry.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
+{
+ return call_int_hook(xfrm_policy_delete_security, 0, ctx);
+}
+
+/**
+ * security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
+ * @x: xfrm state being added to the SAD
+ * @sec_ctx: security label provided by userspace
+ *
+ * Allocate a security structure to the @x->security field; the security field
+ * is initialized to NULL when the xfrm_state is allocated. Set the context to
+ * correspond to @sec_ctx.
+ *
+ * Return: Return 0 if operation was successful.
+ */
+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);
+
+/**
+ * security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
+ * @x: xfrm state being added to the SAD
+ * @polsec: associated policy's security context
+ * @secid: secid from the flow
+ *
+ * Allocate a security structure to the x->security field; the security field
+ * is initialized to NULL when the xfrm_state is allocated. Set the context to
+ * correspond to secid.
+ *
+ * Return: Returns 0 if operation was successful.
+ */
+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);
+}
+
+/**
+ * security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
+ * @x: xfrm state
+ *
+ * Authorize deletion of x->security.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+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);
+
+/**
+ * security_xfrm_state_free() - Free a xfrm state
+ * @x: xfrm state
+ *
+ * Deallocate x->security.
+ */
+void security_xfrm_state_free(struct xfrm_state *x)
+{
+ call_void_hook(xfrm_state_free_security, x);
+}
+
+/**
+ * security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
+ * @ctx: target xfrm security context
+ * @fl_secid: flow secid used to authorize access
+ *
+ * Check permission when a flow selects a xfrm_policy for processing XFRMs on a
+ * packet. The hook is called when selecting either a per-socket policy or a
+ * generic xfrm policy.
+ *
+ * Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
+ * other errors.
+ */
+int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
+{
+ return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
+}
+
+/**
+ * security_xfrm_state_pol_flow_match() - Check for a xfrm match
+ * @x: xfrm state to match
+ * @xp: xfrm policy to check for a match
+ * @flic: flow to check for a match.
+ *
+ * Check @xp and @flic for a match with @x.
+ *
+ * Return: Returns 1 if there is a match.
+ */
+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;
+}
+
+/**
+ * security_xfrm_decode_session() - Determine the xfrm secid for a packet
+ * @skb: xfrm packet
+ * @secid: secid
+ *
+ * Decode the packet in @skb and return the security label in @secid.
+ *
+ * Return: Return 0 if all xfrms used have the same secid.
+ */
+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
+/**
+ * security_key_alloc() - Allocate and initialize a kernel key LSM blob
+ * @key: key
+ * @cred: credentials
+ * @flags: allocation flags
+ *
+ * Permit allocation of a key and assign security data. Note that key does not
+ * have a serial number assigned at this point.
+ *
+ * Return: Return 0 if permission is granted, -ve error otherwise.
+ */
+int security_key_alloc(struct key *key, const struct cred *cred,
+ unsigned long flags)
+{
+ return call_int_hook(key_alloc, 0, key, cred, flags);
+}
+
+/**
+ * security_key_free() - Free a kernel key LSM blob
+ * @key: key
+ *
+ * Notification of destruction; free security data.
+ */
+void security_key_free(struct key *key)
+{
+ call_void_hook(key_free, key);
+}
+
+/**
+ * security_key_permission() - Check if a kernel key operation is allowed
+ * @key_ref: key reference
+ * @cred: credentials of actor requesting access
+ * @need_perm: requested permissions
+ *
+ * See whether a specific operational right is granted to a process on a key.
+ *
+ * Return: Return 0 if permission is granted, -ve error otherwise.
+ */
+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);
+}
+
+/**
+ * security_key_getsecurity() - Get the key's security label
+ * @key: key
+ * @buffer: security label buffer
+ *
+ * Get a textual representation of the security context attached to a key for
+ * the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
+ * storage for the NUL-terminated string and the caller should free it.
+ *
+ * Return: Returns the length of @buffer (including terminating NUL) or -ve if
+ * an error occurs. May also return 0 (and a NULL buffer pointer) if
+ * there is no security label assigned to the key.
+ */
+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
+/**
+ * security_audit_rule_init() - Allocate and init an LSM audit rule struct
+ * @field: audit action
+ * @op: rule operator
+ * @rulestr: rule context
+ * @lsmrule: receive buffer for audit rule struct
+ *
+ * Allocate and initialize an LSM audit rule structure.
+ *
+ * Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
+ * an invalid rule.
+ */
+int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
+{
+ return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule);
+}
+
+/**
+ * security_audit_rule_known() - Check if an audit rule contains LSM fields
+ * @krule: audit rule
+ *
+ * Specifies whether given @krule contains any fields related to the current
+ * LSM.
+ *
+ * Return: Returns 1 in case of relation found, 0 otherwise.
+ */
+int security_audit_rule_known(struct audit_krule *krule)
+{
+ return call_int_hook(audit_rule_known, 0, krule);
+}
+
+/**
+ * security_audit_rule_free() - Free an LSM audit rule struct
+ * @lsmrule: audit rule struct
+ *
+ * Deallocate the LSM audit rule structure previously allocated by
+ * audit_rule_init().
+ */
+void security_audit_rule_free(void *lsmrule)
+{
+ call_void_hook(audit_rule_free, lsmrule);
+}
+
+/**
+ * security_audit_rule_match() - Check if a label matches an audit rule
+ * @secid: security label
+ * @field: LSM audit field
+ * @op: matching operator
+ * @lsmrule: audit rule
+ *
+ * Determine if given @secid matches a rule previously approved by
+ * security_audit_rule_known().
+ *
+ * Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
+ * failure.
+ */
+int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
+{
+ return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule);
+}
+#endif /* CONFIG_AUDIT */
+
+#ifdef CONFIG_BPF_SYSCALL
+/**
+ * security_bpf() - Check if the bpf syscall operation is allowed
+ * @cmd: command
+ * @attr: bpf attribute
+ * @size: size
+ *
+ * Do a initial check for all bpf syscalls after the attribute is copied into
+ * the kernel. The actual security module can implement their own rules to
+ * check the specific cmd they need.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
+{
+ return call_int_hook(bpf, 0, cmd, attr, size);
+}
+
+/**
+ * security_bpf_map() - Check if access to a bpf map is allowed
+ * @map: bpf map
+ * @fmode: mode
+ *
+ * Do a check when the kernel generates and returns a file descriptor for eBPF
+ * maps.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_bpf_map(struct bpf_map *map, fmode_t fmode)
+{
+ return call_int_hook(bpf_map, 0, map, fmode);
+}
+
+/**
+ * security_bpf_prog() - Check if access to a bpf program is allowed
+ * @prog: bpf program
+ *
+ * Do a check when the kernel generates and returns a file descriptor for eBPF
+ * programs.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_bpf_prog(struct bpf_prog *prog)
+{
+ return call_int_hook(bpf_prog, 0, prog);
+}
+
+/**
+ * security_bpf_map_alloc() - Allocate a bpf map LSM blob
+ * @map: bpf map
+ *
+ * Initialize the security field inside bpf map.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_bpf_map_alloc(struct bpf_map *map)
+{
+ return call_int_hook(bpf_map_alloc_security, 0, map);
+}
+
+/**
+ * security_bpf_prog_alloc() - Allocate a bpf program LSM blob
+ * @aux: bpf program aux info struct
+ *
+ * Initialize the security field inside bpf program.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
+{
+ return call_int_hook(bpf_prog_alloc_security, 0, aux);
+}
+
+/**
+ * security_bpf_map_free() - Free a bpf map's LSM blob
+ * @map: bpf map
+ *
+ * Clean up the security information stored inside bpf map.
+ */
+void security_bpf_map_free(struct bpf_map *map)
+{
+ call_void_hook(bpf_map_free_security, map);
+}
+
+/**
+ * security_bpf_prog_free() - Free a bpf program's LSM blob
+ * @aux: bpf program aux info struct
+ *
+ * Clean up the security information stored inside bpf prog.
+ */
+void security_bpf_prog_free(struct bpf_prog_aux *aux)
+{
+ call_void_hook(bpf_prog_free_security, aux);
+}
+#endif /* CONFIG_BPF_SYSCALL */
+
+/**
+ * security_locked_down() - Check if a kernel feature is allowed
+ * @what: requested kernel feature
+ *
+ * Determine whether a kernel feature that potentially enables arbitrary code
+ * execution in kernel space should be permitted.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_locked_down(enum lockdown_reason what)
+{
+ return call_int_hook(locked_down, 0, what);
+}
+EXPORT_SYMBOL(security_locked_down);
+
+#ifdef CONFIG_PERF_EVENTS
+/**
+ * security_perf_event_open() - Check if a perf event open is allowed
+ * @attr: perf event attribute
+ * @type: type of event
+ *
+ * Check whether the @type of perf_event_open syscall is allowed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_perf_event_open(struct perf_event_attr *attr, int type)
+{
+ return call_int_hook(perf_event_open, 0, attr, type);
+}
+
+/**
+ * security_perf_event_alloc() - Allocate a perf event LSM blob
+ * @event: perf event
+ *
+ * Allocate and save perf_event security info.
+ *
+ * Return: Returns 0 on success, error on failure.
+ */
+int security_perf_event_alloc(struct perf_event *event)
+{
+ return call_int_hook(perf_event_alloc, 0, event);
+}
+
+/**
+ * security_perf_event_free() - Free a perf event LSM blob
+ * @event: perf event
+ *
+ * Release (free) perf_event security info.
+ */
+void security_perf_event_free(struct perf_event *event)
+{
+ call_void_hook(perf_event_free, event);
+}
+
+/**
+ * security_perf_event_read() - Check if reading a perf event label is allowed
+ * @event: perf event
+ *
+ * Read perf_event security info if allowed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_perf_event_read(struct perf_event *event)
+{
+ return call_int_hook(perf_event_read, 0, event);
+}
+
+/**
+ * security_perf_event_write() - Check if writing a perf event label is allowed
+ * @event: perf event
+ *
+ * Write perf_event security info if allowed.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_perf_event_write(struct perf_event *event)
+{
+ return call_int_hook(perf_event_write, 0, event);
+}
+#endif /* CONFIG_PERF_EVENTS */
+
+#ifdef CONFIG_IO_URING
+/**
+ * security_uring_override_creds() - Check if overriding creds is allowed
+ * @new: new credentials
+ *
+ * Check if the current task, executing an io_uring operation, is allowed to
+ * override it's credentials with @new.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_uring_override_creds(const struct cred *new)
+{
+ return call_int_hook(uring_override_creds, 0, new);
+}
+
+/**
+ * security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
+ *
+ * Check whether the current task is allowed to spawn a io_uring polling thread
+ * (IORING_SETUP_SQPOLL).
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_uring_sqpoll(void)
+{
+ return call_int_hook(uring_sqpoll, 0);
+}
+
+/**
+ * security_uring_cmd() - Check if a io_uring passthrough command is allowed
+ * @ioucmd: command
+ *
+ * Check whether the file_operations uring_cmd is allowed to run.
+ *
+ * Return: Returns 0 if permission is granted.
+ */
+int security_uring_cmd(struct io_uring_cmd *ioucmd)
+{
+ return call_int_hook(uring_cmd, 0, ioucmd);
+}
+#endif /* CONFIG_IO_URING */