FreeBSD/Linux Kernel Cross Reference
sys/security/security.c

     /*
      * 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>
      *
      *      This program is free software; you can redistribute it and/or modify
      *      it under the terms of the GNU General Public License as published by
     *      the Free Software Foundation; either version 2 of the License, or
     *      (at your option) any later version.
     */
    
    #include <linux/capability.h>
    #include <linux/module.h>
    #include <linux/init.h>
    #include <linux/kernel.h>
    #include <linux/security.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 <net/flow.h>
    
    #define MAX_LSM_EVM_XATTR       2
    
    /* Boot-time LSM user choice */
    static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
            CONFIG_DEFAULT_SECURITY;
    
    static struct security_operations *security_ops;
    static struct security_operations default_security_ops = {
            .name   = "default",
    };
    
    static inline int __init verify(struct security_operations *ops)
    {
            /* verify the security_operations structure exists */
            if (!ops)
                    return -EINVAL;
            security_fixup_ops(ops);
            return 0;
    }
    
    static void __init do_security_initcalls(void)
    {
            initcall_t *call;
            call = __security_initcall_start;
            while (call < __security_initcall_end) {
                    (*call) ();
                    call++;
            }
    }
    
    /**
     * security_init - initializes the security framework
     *
     * This should be called early in the kernel initialization sequence.
     */
    int __init security_init(void)
    {
            printk(KERN_INFO "Security Framework initialized\n");
    
            security_fixup_ops(&default_security_ops);
            security_ops = &default_security_ops;
            do_security_initcalls();
    
            return 0;
    }
    
    void reset_security_ops(void)
    {
            security_ops = &default_security_ops;
    }
    
    /* Save user chosen LSM */
    static int __init choose_lsm(char *str)
    {
            strncpy(chosen_lsm, str, SECURITY_NAME_MAX);
            return 1;
    }
    __setup("security=", choose_lsm);
    
    /**
     * security_module_enable - Load given security module on boot ?
     * @ops: a pointer to the struct security_operations that is to be checked.
     *
     * Each LSM must pass this method before registering its own operations
     * to avoid security registration races. This method may also be used
     * to check if your LSM is currently loaded during kernel initialization.
     *
     * Return true if:
     *      -The passed LSM is the one chosen by user at boot time,
     *      -or the passed LSM is configured as the default and the user did not
     *       choose an alternate LSM at boot time.
    * Otherwise, return false.
    */
   int __init security_module_enable(struct security_operations *ops)
   {
           return !strcmp(ops->name, chosen_lsm);
   }
   
   /**
    * register_security - registers a security framework with the kernel
    * @ops: a pointer to the struct security_options that is to be registered
    *
    * This function allows a security module to register itself with the
    * kernel security subsystem.  Some rudimentary checking is done on the @ops
    * value passed to this function. You'll need to check first if your LSM
    * is allowed to register its @ops by calling security_module_enable(@ops).
    *
    * If there is already a security module registered with the kernel,
    * an error will be returned.  Otherwise %0 is returned on success.
    */
   int __init register_security(struct security_operations *ops)
   {
           if (verify(ops)) {
                   printk(KERN_DEBUG "%s could not verify "
                          "security_operations structure.\n", __func__);
                   return -EINVAL;
           }
   
           if (security_ops != &default_security_ops)
                   return -EAGAIN;
   
           security_ops = ops;
   
           return 0;
   }
   
   /* Security operations */
   
   int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
   {
   #ifdef CONFIG_SECURITY_YAMA_STACKED
           int rc;
           rc = yama_ptrace_access_check(child, mode);
           if (rc)
                   return rc;
   #endif
           return security_ops->ptrace_access_check(child, mode);
   }
   
   int security_ptrace_traceme(struct task_struct *parent)
   {
   #ifdef CONFIG_SECURITY_YAMA_STACKED
           int rc;
           rc = yama_ptrace_traceme(parent);
           if (rc)
                   return rc;
   #endif
           return security_ops->ptrace_traceme(parent);
   }
   
   int security_capget(struct task_struct *target,
                        kernel_cap_t *effective,
                        kernel_cap_t *inheritable,
                        kernel_cap_t *permitted)
   {
           return security_ops->capget(target, effective, inheritable, permitted);
   }
   
   int security_capset(struct cred *new, const struct cred *old,
                       const kernel_cap_t *effective,
                       const kernel_cap_t *inheritable,
                       const kernel_cap_t *permitted)
   {
           return security_ops->capset(new, old,
                                       effective, inheritable, permitted);
   }
   
   int security_capable(const struct cred *cred, struct user_namespace *ns,
                        int cap)
   {
           return security_ops->capable(cred, ns, cap, SECURITY_CAP_AUDIT);
   }
   
   int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
                                int cap)
   {
           return security_ops->capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
   }
   
   int security_quotactl(int cmds, int type, int id, struct super_block *sb)
   {
           return security_ops->quotactl(cmds, type, id, sb);
   }
   
   int security_quota_on(struct dentry *dentry)
   {
           return security_ops->quota_on(dentry);
   }
   
   int security_syslog(int type)
   {
           return security_ops->syslog(type);
   }
   
   int security_settime(const struct timespec *ts, const struct timezone *tz)
   {
           return security_ops->settime(ts, tz);
   }
   
   int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
   {
           return security_ops->vm_enough_memory(mm, pages);
   }
   
   int security_bprm_set_creds(struct linux_binprm *bprm)
   {
           return security_ops->bprm_set_creds(bprm);
   }
   
   int security_bprm_check(struct linux_binprm *bprm)
   {
           int ret;
   
           ret = security_ops->bprm_check_security(bprm);
           if (ret)
                   return ret;
           return ima_bprm_check(bprm);
   }
   
   void security_bprm_committing_creds(struct linux_binprm *bprm)
   {
           security_ops->bprm_committing_creds(bprm);
   }
   
   void security_bprm_committed_creds(struct linux_binprm *bprm)
   {
           security_ops->bprm_committed_creds(bprm);
   }
   
   int security_bprm_secureexec(struct linux_binprm *bprm)
   {
           return security_ops->bprm_secureexec(bprm);
   }
   
   int security_sb_alloc(struct super_block *sb)
   {
           return security_ops->sb_alloc_security(sb);
   }
   
   void security_sb_free(struct super_block *sb)
   {
           security_ops->sb_free_security(sb);
   }
   
   int security_sb_copy_data(char *orig, char *copy)
   {
           return security_ops->sb_copy_data(orig, copy);
   }
   EXPORT_SYMBOL(security_sb_copy_data);
   
   int security_sb_remount(struct super_block *sb, void *data)
   {
           return security_ops->sb_remount(sb, data);
   }
   
   int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
   {
           return security_ops->sb_kern_mount(sb, flags, data);
   }
   
   int security_sb_show_options(struct seq_file *m, struct super_block *sb)
   {
           return security_ops->sb_show_options(m, sb);
   }
   
   int security_sb_statfs(struct dentry *dentry)
   {
           return security_ops->sb_statfs(dentry);
   }
   
   int security_sb_mount(const char *dev_name, struct path *path,
                          const char *type, unsigned long flags, void *data)
   {
           return security_ops->sb_mount(dev_name, path, type, flags, data);
   }
   
   int security_sb_umount(struct vfsmount *mnt, int flags)
   {
           return security_ops->sb_umount(mnt, flags);
   }
   
   int security_sb_pivotroot(struct path *old_path, struct path *new_path)
   {
           return security_ops->sb_pivotroot(old_path, new_path);
   }
   
   int security_sb_set_mnt_opts(struct super_block *sb,
                                   struct security_mnt_opts *opts)
   {
           return security_ops->sb_set_mnt_opts(sb, opts);
   }
   EXPORT_SYMBOL(security_sb_set_mnt_opts);
   
   void security_sb_clone_mnt_opts(const struct super_block *oldsb,
                                   struct super_block *newsb)
   {
           security_ops->sb_clone_mnt_opts(oldsb, newsb);
   }
   EXPORT_SYMBOL(security_sb_clone_mnt_opts);
   
   int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
   {
           return security_ops->sb_parse_opts_str(options, opts);
   }
   EXPORT_SYMBOL(security_sb_parse_opts_str);
   
   int security_inode_alloc(struct inode *inode)
   {
           inode->i_security = NULL;
           return security_ops->inode_alloc_security(inode);
   }
   
   void security_inode_free(struct inode *inode)
   {
           integrity_inode_free(inode);
           security_ops->inode_free_security(inode);
   }
   
   int security_inode_init_security(struct inode *inode, struct inode *dir,
                                    const struct qstr *qstr,
                                    const initxattrs initxattrs, void *fs_data)
   {
           struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
           struct xattr *lsm_xattr, *evm_xattr, *xattr;
           int ret;
   
           if (unlikely(IS_PRIVATE(inode)))
                   return 0;
   
           memset(new_xattrs, 0, sizeof new_xattrs);
           if (!initxattrs)
                   return security_ops->inode_init_security(inode, dir, qstr,
                                                            NULL, NULL, NULL);
           lsm_xattr = new_xattrs;
           ret = security_ops->inode_init_security(inode, dir, qstr,
                                                   &lsm_xattr->name,
                                                   &lsm_xattr->value,
                                                   &lsm_xattr->value_len);
           if (ret)
                   goto out;
   
           evm_xattr = lsm_xattr + 1;
           ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
           if (ret)
                   goto out;
           ret = initxattrs(inode, new_xattrs, fs_data);
   out:
           for (xattr = new_xattrs; xattr->name != NULL; xattr++) {
                   kfree(xattr->name);
                   kfree(xattr->value);
           }
           return (ret == -EOPNOTSUPP) ? 0 : ret;
   }
   EXPORT_SYMBOL(security_inode_init_security);
   
   int security_old_inode_init_security(struct inode *inode, struct inode *dir,
                                        const struct qstr *qstr, char **name,
                                        void **value, size_t *len)
   {
           if (unlikely(IS_PRIVATE(inode)))
                   return -EOPNOTSUPP;
           return security_ops->inode_init_security(inode, dir, qstr, name, value,
                                                    len);
   }
   EXPORT_SYMBOL(security_old_inode_init_security);
   
   #ifdef CONFIG_SECURITY_PATH
   int security_path_mknod(struct path *dir, struct dentry *dentry, umode_t mode,
                           unsigned int dev)
   {
           if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
                   return 0;
           return security_ops->path_mknod(dir, dentry, mode, dev);
   }
   EXPORT_SYMBOL(security_path_mknod);
   
   int security_path_mkdir(struct path *dir, struct dentry *dentry, umode_t mode)
   {
           if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
                   return 0;
           return security_ops->path_mkdir(dir, dentry, mode);
   }
   EXPORT_SYMBOL(security_path_mkdir);
   
   int security_path_rmdir(struct path *dir, struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
                   return 0;
           return security_ops->path_rmdir(dir, dentry);
   }
   
   int security_path_unlink(struct path *dir, struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
                   return 0;
           return security_ops->path_unlink(dir, dentry);
   }
   EXPORT_SYMBOL(security_path_unlink);
   
   int security_path_symlink(struct path *dir, struct dentry *dentry,
                             const char *old_name)
   {
           if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
                   return 0;
           return security_ops->path_symlink(dir, dentry, old_name);
   }
   
   int security_path_link(struct dentry *old_dentry, struct path *new_dir,
                          struct dentry *new_dentry)
   {
           if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
                   return 0;
           return security_ops->path_link(old_dentry, new_dir, new_dentry);
   }
   
   int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
                            struct path *new_dir, struct dentry *new_dentry)
   {
           if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
                        (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
                   return 0;
           return security_ops->path_rename(old_dir, old_dentry, new_dir,
                                            new_dentry);
   }
   EXPORT_SYMBOL(security_path_rename);
   
   int security_path_truncate(struct path *path)
   {
           if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
                   return 0;
           return security_ops->path_truncate(path);
   }
   
   int security_path_chmod(struct path *path, umode_t mode)
   {
           if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
                   return 0;
           return security_ops->path_chmod(path, mode);
   }
   
   int security_path_chown(struct path *path, kuid_t uid, kgid_t gid)
   {
           if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
                   return 0;
           return security_ops->path_chown(path, uid, gid);
   }
   
   int security_path_chroot(struct path *path)
   {
           return security_ops->path_chroot(path);
   }
   #endif
   
   int security_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
   {
           if (unlikely(IS_PRIVATE(dir)))
                   return 0;
           return security_ops->inode_create(dir, dentry, mode);
   }
   EXPORT_SYMBOL_GPL(security_inode_create);
   
   int security_inode_link(struct dentry *old_dentry, struct inode *dir,
                            struct dentry *new_dentry)
   {
           if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
                   return 0;
           return security_ops->inode_link(old_dentry, dir, new_dentry);
   }
   
   int security_inode_unlink(struct inode *dir, struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_unlink(dir, dentry);
   }
   
   int security_inode_symlink(struct inode *dir, struct dentry *dentry,
                               const char *old_name)
   {
           if (unlikely(IS_PRIVATE(dir)))
                   return 0;
           return security_ops->inode_symlink(dir, dentry, old_name);
   }
   
   int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
   {
           if (unlikely(IS_PRIVATE(dir)))
                   return 0;
           return security_ops->inode_mkdir(dir, dentry, mode);
   }
   EXPORT_SYMBOL_GPL(security_inode_mkdir);
   
   int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_rmdir(dir, dentry);
   }
   
   int security_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
   {
           if (unlikely(IS_PRIVATE(dir)))
                   return 0;
           return security_ops->inode_mknod(dir, dentry, mode, dev);
   }
   
   int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
                              struct inode *new_dir, struct dentry *new_dentry)
   {
           if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
               (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
                   return 0;
           return security_ops->inode_rename(old_dir, old_dentry,
                                              new_dir, new_dentry);
   }
   
   int security_inode_readlink(struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_readlink(dentry);
   }
   
   int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_follow_link(dentry, nd);
   }
   
   int security_inode_permission(struct inode *inode, int mask)
   {
           if (unlikely(IS_PRIVATE(inode)))
                   return 0;
           return security_ops->inode_permission(inode, mask);
   }
   
   int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
   {
           int ret;
   
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           ret = security_ops->inode_setattr(dentry, attr);
           if (ret)
                   return ret;
           return evm_inode_setattr(dentry, attr);
   }
   EXPORT_SYMBOL_GPL(security_inode_setattr);
   
   int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_getattr(mnt, dentry);
   }
   
   int security_inode_setxattr(struct dentry *dentry, const char *name,
                               const void *value, size_t size, int flags)
   {
           int ret;
   
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           ret = security_ops->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(dentry, name, value, size);
   }
   
   void security_inode_post_setxattr(struct dentry *dentry, const char *name,
                                     const void *value, size_t size, int flags)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return;
           security_ops->inode_post_setxattr(dentry, name, value, size, flags);
           evm_inode_post_setxattr(dentry, name, value, size);
   }
   
   int security_inode_getxattr(struct dentry *dentry, const char *name)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_getxattr(dentry, name);
   }
   
   int security_inode_listxattr(struct dentry *dentry)
   {
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           return security_ops->inode_listxattr(dentry);
   }
   
   int security_inode_removexattr(struct dentry *dentry, const char *name)
   {
           int ret;
   
           if (unlikely(IS_PRIVATE(dentry->d_inode)))
                   return 0;
           ret = security_ops->inode_removexattr(dentry, name);
           if (ret)
                   return ret;
           ret = ima_inode_removexattr(dentry, name);
           if (ret)
                   return ret;
           return evm_inode_removexattr(dentry, name);
   }
   
   int security_inode_need_killpriv(struct dentry *dentry)
   {
           return security_ops->inode_need_killpriv(dentry);
   }
   
   int security_inode_killpriv(struct dentry *dentry)
   {
           return security_ops->inode_killpriv(dentry);
   }
   
   int security_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
   {
           if (unlikely(IS_PRIVATE(inode)))
                   return -EOPNOTSUPP;
           return security_ops->inode_getsecurity(inode, name, buffer, alloc);
   }
   
   int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
   {
           if (unlikely(IS_PRIVATE(inode)))
                   return -EOPNOTSUPP;
           return security_ops->inode_setsecurity(inode, name, value, size, flags);
   }
   
   int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
   {
           if (unlikely(IS_PRIVATE(inode)))
                   return 0;
           return security_ops->inode_listsecurity(inode, buffer, buffer_size);
   }
   
   void security_inode_getsecid(const struct inode *inode, u32 *secid)
   {
           security_ops->inode_getsecid(inode, secid);
   }
   
   int security_file_permission(struct file *file, int mask)
   {
           int ret;
   
           ret = security_ops->file_permission(file, mask);
           if (ret)
                   return ret;
   
           return fsnotify_perm(file, mask);
   }
   
   int security_file_alloc(struct file *file)
   {
           return security_ops->file_alloc_security(file);
   }
   
   void security_file_free(struct file *file)
   {
           security_ops->file_free_security(file);
   }
   
   int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
   {
           return security_ops->file_ioctl(file, cmd, arg);
   }
   
   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
            * BDI_CAP_EXEC_MMAP (== VM_MAYEXEC) in this case
            */
           if (!(file->f_path.mnt->mnt_flags & MNT_NOEXEC)) {
   #ifndef CONFIG_MMU
                   unsigned long caps = 0;
                   struct address_space *mapping = file->f_mapping;
                   if (mapping && mapping->backing_dev_info)
                           caps = mapping->backing_dev_info->capabilities;
                   if (!(caps & BDI_CAP_EXEC_MAP))
                           return prot;
   #endif
                   return prot | PROT_EXEC;
           }
           /* anything on noexec mount won't get PROT_EXEC */
           return prot;
   }
   
   int security_mmap_file(struct file *file, unsigned long prot,
                           unsigned long flags)
   {
           int ret;
           ret = security_ops->mmap_file(file, prot,
                                           mmap_prot(file, prot), flags);
           if (ret)
                   return ret;
           return ima_file_mmap(file, prot);
   }
   
   int security_mmap_addr(unsigned long addr)
   {
           return security_ops->mmap_addr(addr);
   }
   
   int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
                               unsigned long prot)
   {
           return security_ops->file_mprotect(vma, reqprot, prot);
   }
   
   int security_file_lock(struct file *file, unsigned int cmd)
   {
           return security_ops->file_lock(file, cmd);
   }
   
   int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
   {
           return security_ops->file_fcntl(file, cmd, arg);
   }
   
   int security_file_set_fowner(struct file *file)
   {
           return security_ops->file_set_fowner(file);
   }
   
   int security_file_send_sigiotask(struct task_struct *tsk,
                                     struct fown_struct *fown, int sig)
   {
           return security_ops->file_send_sigiotask(tsk, fown, sig);
   }
   
   int security_file_receive(struct file *file)
   {
           return security_ops->file_receive(file);
   }
   
   int security_file_open(struct file *file, const struct cred *cred)
   {
           int ret;
   
           ret = security_ops->file_open(file, cred);
           if (ret)
                   return ret;
   
           return fsnotify_perm(file, MAY_OPEN);
   }
   
   int security_task_create(unsigned long clone_flags)
   {
           return security_ops->task_create(clone_flags);
   }
   
   void security_task_free(struct task_struct *task)
   {
   #ifdef CONFIG_SECURITY_YAMA_STACKED
           yama_task_free(task);
   #endif
           security_ops->task_free(task);
   }
   
   int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
   {
           return security_ops->cred_alloc_blank(cred, gfp);
   }
   
   void security_cred_free(struct cred *cred)
   {
           security_ops->cred_free(cred);
   }
   
   int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
   {
           return security_ops->cred_prepare(new, old, gfp);
   }
   
   void security_transfer_creds(struct cred *new, const struct cred *old)
   {
           security_ops->cred_transfer(new, old);
   }
   
   int security_kernel_act_as(struct cred *new, u32 secid)
   {
           return security_ops->kernel_act_as(new, secid);
   }
   
   int security_kernel_create_files_as(struct cred *new, struct inode *inode)
   {
           return security_ops->kernel_create_files_as(new, inode);
   }
   
   int security_kernel_module_request(char *kmod_name)
   {
           return security_ops->kernel_module_request(kmod_name);
   }
   
   int security_kernel_module_from_file(struct file *file)
   {
           int ret;
   
           ret = security_ops->kernel_module_from_file(file);
           if (ret)
                   return ret;
           return ima_module_check(file);
   }
   
   int security_task_fix_setuid(struct cred *new, const struct cred *old,
                                int flags)
   {
           return security_ops->task_fix_setuid(new, old, flags);
   }
   
   int security_task_setpgid(struct task_struct *p, pid_t pgid)
   {
           return security_ops->task_setpgid(p, pgid);
   }
   
   int security_task_getpgid(struct task_struct *p)
   {
           return security_ops->task_getpgid(p);
   }
   
   int security_task_getsid(struct task_struct *p)
   {
           return security_ops->task_getsid(p);
   }
   
   void security_task_getsecid(struct task_struct *p, u32 *secid)
   {
           security_ops->task_getsecid(p, secid);
   }
   EXPORT_SYMBOL(security_task_getsecid);
   
   int security_task_setnice(struct task_struct *p, int nice)
   {
           return security_ops->task_setnice(p, nice);
   }
   
   int security_task_setioprio(struct task_struct *p, int ioprio)
   {
           return security_ops->task_setioprio(p, ioprio);
   }
   
   int security_task_getioprio(struct task_struct *p)
   {
           return security_ops->task_getioprio(p);
   }
   
   int security_task_setrlimit(struct task_struct *p, unsigned int resource,
                   struct rlimit *new_rlim)
   {
           return security_ops->task_setrlimit(p, resource, new_rlim);
   }
   
   int security_task_setscheduler(struct task_struct *p)
   {
           return security_ops->task_setscheduler(p);
   }
   
   int security_task_getscheduler(struct task_struct *p)
   {
           return security_ops->task_getscheduler(p);
   }
   
   int security_task_movememory(struct task_struct *p)
   {
           return security_ops->task_movememory(p);
   }
   
   int security_task_kill(struct task_struct *p, struct siginfo *info,
                           int sig, u32 secid)
   {
           return security_ops->task_kill(p, info, sig, secid);
   }
   
   int security_task_wait(struct task_struct *p)
   {
           return security_ops->task_wait(p);
   }
   
   int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
                            unsigned long arg4, unsigned long arg5)
   {
   #ifdef CONFIG_SECURITY_YAMA_STACKED
           int rc;
           rc = yama_task_prctl(option, arg2, arg3, arg4, arg5);
           if (rc != -ENOSYS)
                   return rc;
   #endif
           return security_ops->task_prctl(option, arg2, arg3, arg4, arg5);
   }
   
   void security_task_to_inode(struct task_struct *p, struct inode *inode)
   {
           security_ops->task_to_inode(p, inode);
   }
   
   int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
   {
           return security_ops->ipc_permission(ipcp, flag);
   }
   
   void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
   {
           security_ops->ipc_getsecid(ipcp, secid);
   }
   
   int security_msg_msg_alloc(struct msg_msg *msg)
   {
           return security_ops->msg_msg_alloc_security(msg);
   }
   
   void security_msg_msg_free(struct msg_msg *msg)
   {
           security_ops->msg_msg_free_security(msg);
   }
   
   int security_msg_queue_alloc(struct msg_queue *msq)
   {
           return security_ops->msg_queue_alloc_security(msq);
   }
   
   void security_msg_queue_free(struct msg_queue *msq)
   {
           security_ops->msg_queue_free_security(msq);
   }
   
   int security_msg_queue_associate(struct msg_queue *msq, int msqflg)
   {
           return security_ops->msg_queue_associate(msq, msqflg);
   }
   
   int security_msg_queue_msgctl(struct msg_queue *msq, int cmd)
   {
           return security_ops->msg_queue_msgctl(msq, cmd);
   }
   
   int security_msg_queue_msgsnd(struct msg_queue *msq,
                                  struct msg_msg *msg, int msqflg)
   {
           return security_ops->msg_queue_msgsnd(msq, msg, msqflg);
   }
   
   int security_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
                                  struct task_struct *target, long type, int mode)
   {
           return security_ops->msg_queue_msgrcv(msq, msg, target, type, mode);
   }
   
   int security_shm_alloc(struct shmid_kernel *shp)
   {
           return security_ops->shm_alloc_security(shp);
   }
   
   void security_shm_free(struct shmid_kernel *shp)
   {
           security_ops->shm_free_security(shp);
   }
   
   int security_shm_associate(struct shmid_kernel *shp, int shmflg)
   {
           return security_ops->shm_associate(shp, shmflg);
   }
   
   int security_shm_shmctl(struct shmid_kernel *shp, int cmd)
   {
           return security_ops->shm_shmctl(shp, cmd);
   }
   
   int security_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg)
   {
           return security_ops->shm_shmat(shp, shmaddr, shmflg);
   }
  
  int security_sem_alloc(struct sem_array *sma)
  {
          return security_ops->sem_alloc_security(sma);
  }
  
  void security_sem_free(struct sem_array *sma)
  {
          security_ops->sem_free_security(sma);
  }
  
  int security_sem_associate(struct sem_array *sma, int semflg)
  {
          return security_ops->sem_associate(sma, semflg);
  }
  
  int security_sem_semctl(struct sem_array *sma, int cmd)
  {
          return security_ops->sem_semctl(sma, cmd);
  }
  
  int security_sem_semop(struct sem_array *sma, struct sembuf *sops,
                          unsigned nsops, int alter)
  {
          return security_ops->sem_semop(sma, sops, nsops, alter);
  }
  
  void security_d_instantiate(struct dentry *dentry, struct inode *inode)
  {
          if (unlikely(inode && IS_PRIVATE(inode)))
                  return;
          security_ops->d_instantiate(dentry, inode);
  }
  EXPORT_SYMBOL(security_d_instantiate);
  
  int security_getprocattr(struct task_struct *p, char *name, char **value)
  {
          return security_ops->getprocattr(p, name, value);
  }
  
  int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
  {
          return security_ops->setprocattr(p, name, value, size);
  }
  
  int security_netlink_send(struct sock *sk, struct sk_buff *skb)
  {
          return security_ops->netlink_send(sk, skb);
  }
  
  int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
  {
          return security_ops->secid_to_secctx(secid, secdata, seclen);
  }
  EXPORT_SYMBOL(security_secid_to_secctx);
  
  int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
  {
          return security_ops->secctx_to_secid(secdata, seclen, secid);
  }
  EXPORT_SYMBOL(security_secctx_to_secid);
  
  void security_release_secctx(char *secdata, u32 seclen)
  {
          security_ops->release_secctx(secdata, seclen);
  }
  EXPORT_SYMBOL(security_release_secctx);
  
  int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
  {
          return security_ops->inode_notifysecctx(inode, ctx, ctxlen);
  }
  EXPORT_SYMBOL(security_inode_notifysecctx);
  
  int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
  {
          return security_ops->inode_setsecctx(dentry, ctx, ctxlen);
  }
  EXPORT_SYMBOL(security_inode_setsecctx);
  
  int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
  {
          return security_ops->inode_getsecctx(inode, ctx, ctxlen);
  }
  EXPORT_SYMBOL(security_inode_getsecctx);
  
  #ifdef CONFIG_SECURITY_NETWORK
  
  int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)
  {
          return security_ops->unix_stream_connect(sock, other, newsk);
  }
  EXPORT_SYMBOL(security_unix_stream_connect);
  
  int security_unix_may_send(struct socket *sock,  struct socket *other)
  {
          return security_ops->unix_may_send(sock, other);
  }
  EXPORT_SYMBOL(security_unix_may_send);
  
  int security_socket_create(int family, int type, int protocol, int kern)
  {
          return security_ops->socket_create(family, type, protocol, kern);
  }
  
  int security_socket_post_create(struct socket *sock, int family,
                                  int type, int protocol, int kern)
  {
          return security_ops->socket_post_create(sock, family, type,
                                                  protocol, kern);
  }
  
  int security_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
  {
          return security_ops->socket_bind(sock, address, addrlen);
  }
  
  int security_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
  {
          return security_ops->socket_connect(sock, address, addrlen);
  }
  
  int security_socket_listen(struct socket *sock, int backlog)
  {
          return security_ops->socket_listen(sock, backlog);
  }
  
  int security_socket_accept(struct socket *sock, struct socket *newsock)
  {
          return security_ops->socket_accept(sock, newsock);
  }
  
  int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
  {
          return security_ops->socket_sendmsg(sock, msg, size);
  }
  
  int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
                              int size, int flags)
  {
          return security_ops->socket_recvmsg(sock, msg, size, flags);
  }
  
  int security_socket_getsockname(struct socket *sock)
  {
          return security_ops->socket_getsockname(sock);
  }
  
  int security_socket_getpeername(struct socket *sock)
  {
          return security_ops->socket_getpeername(sock);
  }
  
  int security_socket_getsockopt(struct socket *sock, int level, int optname)
  {
          return security_ops->socket_getsockopt(sock, level, optname);
  }
  
  int security_socket_setsockopt(struct socket *sock, int level, int optname)
  {
          return security_ops->socket_setsockopt(sock, level, optname);
  }
  
  int security_socket_shutdown(struct socket *sock, int how)
  {
          return security_ops->socket_shutdown(sock, how);
  }
  
  int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
  {
          return security_ops->socket_sock_rcv_skb(sk, skb);
  }
  EXPORT_SYMBOL(security_sock_rcv_skb);
  
  int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
                                        int __user *optlen, unsigned len)
  {
          return security_ops->socket_getpeersec_stream(sock, optval, optlen, len);
  }
  
  int security_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
  {
          return security_ops->socket_getpeersec_dgram(sock, skb, secid);
  }
  EXPORT_SYMBOL(security_socket_getpeersec_dgram);
  
  int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
  {
          return security_ops->sk_alloc_security(sk, family, priority);
  }
  
  void security_sk_free(struct sock *sk)
  {
          security_ops->sk_free_security(sk);
  }
  
  void security_sk_clone(const struct sock *sk, struct sock *newsk)
  {
          security_ops->sk_clone_security(sk, newsk);
  }
  EXPORT_SYMBOL(security_sk_clone);
  
  void security_sk_classify_flow(struct sock *sk, struct flowi *fl)
  {
          security_ops->sk_getsecid(sk, &fl->flowi_secid);
  }
  EXPORT_SYMBOL(security_sk_classify_flow);
  
  void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
  {
          security_ops->req_classify_flow(req, fl);
  }
  EXPORT_SYMBOL(security_req_classify_flow);
  
  void security_sock_graft(struct sock *sk, struct socket *parent)
  {
          security_ops->sock_graft(sk, parent);
  }
  EXPORT_SYMBOL(security_sock_graft);
  
  int security_inet_conn_request(struct sock *sk,
                          struct sk_buff *skb, struct request_sock *req)
  {
          return security_ops->inet_conn_request(sk, skb, req);
  }
  EXPORT_SYMBOL(security_inet_conn_request);
  
  void security_inet_csk_clone(struct sock *newsk,
                          const struct request_sock *req)
  {
          security_ops->inet_csk_clone(newsk, req);
  }
  
  void security_inet_conn_established(struct sock *sk,
                          struct sk_buff *skb)
  {
          security_ops->inet_conn_established(sk, skb);
  }
  
  int security_secmark_relabel_packet(u32 secid)
  {
          return security_ops->secmark_relabel_packet(secid);
  }
  EXPORT_SYMBOL(security_secmark_relabel_packet);
  
  void security_secmark_refcount_inc(void)
  {
          security_ops->secmark_refcount_inc();
  }
  EXPORT_SYMBOL(security_secmark_refcount_inc);
  
  void security_secmark_refcount_dec(void)
  {
          security_ops->secmark_refcount_dec();
  }
  EXPORT_SYMBOL(security_secmark_refcount_dec);
  
  int security_tun_dev_alloc_security(void **security)
  {
          return security_ops->tun_dev_alloc_security(security);
  }
  EXPORT_SYMBOL(security_tun_dev_alloc_security);
  
  void security_tun_dev_free_security(void *security)
  {
          security_ops->tun_dev_free_security(security);
  }
  EXPORT_SYMBOL(security_tun_dev_free_security);
  
  int security_tun_dev_create(void)
  {
          return security_ops->tun_dev_create();
  }
  EXPORT_SYMBOL(security_tun_dev_create);
  
  int security_tun_dev_attach_queue(void *security)
  {
          return security_ops->tun_dev_attach_queue(security);
  }
  EXPORT_SYMBOL(security_tun_dev_attach_queue);
  
  int security_tun_dev_attach(struct sock *sk, void *security)
  {
          return security_ops->tun_dev_attach(sk, security);
  }
  EXPORT_SYMBOL(security_tun_dev_attach);
  
  int security_tun_dev_open(void *security)
  {
          return security_ops->tun_dev_open(security);
  }
  EXPORT_SYMBOL(security_tun_dev_open);
  
  #endif  /* CONFIG_SECURITY_NETWORK */
  
  #ifdef CONFIG_SECURITY_NETWORK_XFRM
  
  int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx)
  {
          return security_ops->xfrm_policy_alloc_security(ctxp, sec_ctx);
  }
  EXPORT_SYMBOL(security_xfrm_policy_alloc);
  
  int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
                                struct xfrm_sec_ctx **new_ctxp)
  {
          return security_ops->xfrm_policy_clone_security(old_ctx, new_ctxp);
  }
  
  void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
  {
          security_ops->xfrm_policy_free_security(ctx);
  }
  EXPORT_SYMBOL(security_xfrm_policy_free);
  
  int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
  {
          return security_ops->xfrm_policy_delete_security(ctx);
  }
  
  int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
  {
          return security_ops->xfrm_state_alloc_security(x, sec_ctx, 0);
  }
  EXPORT_SYMBOL(security_xfrm_state_alloc);
  
  int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
                                        struct xfrm_sec_ctx *polsec, u32 secid)
  {
          if (!polsec)
                  return 0;
          /*
           * We want the context to be taken from secid which is usually
           * from the sock.
           */
          return security_ops->xfrm_state_alloc_security(x, NULL, secid);
  }
  
  int security_xfrm_state_delete(struct xfrm_state *x)
  {
          return security_ops->xfrm_state_delete_security(x);
  }
  EXPORT_SYMBOL(security_xfrm_state_delete);
  
  void security_xfrm_state_free(struct xfrm_state *x)
  {
          security_ops->xfrm_state_free_security(x);
  }
  
  int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir)
  {
          return security_ops->xfrm_policy_lookup(ctx, fl_secid, dir);
  }
  
  int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
                                         struct xfrm_policy *xp,
                                         const struct flowi *fl)
  {
          return security_ops->xfrm_state_pol_flow_match(x, xp, fl);
  }
  
  int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
  {
          return security_ops->xfrm_decode_session(skb, secid, 1);
  }
  
  void security_skb_classify_flow(struct sk_buff *skb, struct flowi *fl)
  {
          int rc = security_ops->xfrm_decode_session(skb, &fl->flowi_secid, 0);
  
          BUG_ON(rc);
  }
  EXPORT_SYMBOL(security_skb_classify_flow);
  
  #endif  /* CONFIG_SECURITY_NETWORK_XFRM */
  
  #ifdef CONFIG_KEYS
  
  int security_key_alloc(struct key *key, const struct cred *cred,
                         unsigned long flags)
  {
          return security_ops->key_alloc(key, cred, flags);
  }
  
  void security_key_free(struct key *key)
  {
          security_ops->key_free(key);
  }
  
  int security_key_permission(key_ref_t key_ref,
                              const struct cred *cred, key_perm_t perm)
  {
          return security_ops->key_permission(key_ref, cred, perm);
  }
  
  int security_key_getsecurity(struct key *key, char **_buffer)
  {
          return security_ops->key_getsecurity(key, _buffer);
  }
  
  #endif  /* CONFIG_KEYS */
  
  #ifdef CONFIG_AUDIT
  
  int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
  {
          return security_ops->audit_rule_init(field, op, rulestr, lsmrule);
  }
  
  int security_audit_rule_known(struct audit_krule *krule)
  {
          return security_ops->audit_rule_known(krule);
  }
  
  void security_audit_rule_free(void *lsmrule)
  {
          security_ops->audit_rule_free(lsmrule);
  }
  
  int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
                                struct audit_context *actx)
  {
          return security_ops->audit_rule_match(secid, field, op, lsmrule, actx);
  }
  
  #endif /* CONFIG_AUDIT */

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