security/integrity/iint.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2008 IBM Corporation
   4  *
   5  * Authors:
   6  * Mimi Zohar <zohar@us.ibm.com>
   7  *
   8  * File: integrity_iint.c
   9  *      - initialize the integrity directory in securityfs
  10  *      - load IMA and EVM keys
  11  */
  12 #include <linux/security.h>
  13 #include "integrity.h"
  14
  15 struct dentry *integrity_dir;
  16
  17 /*
  18  * integrity_kernel_read - read data from the file
  19  *
  20  * This is a function for reading file content instead of kernel_read().
  21  * It does not perform locking checks to ensure it cannot be blocked.
  22  * It does not perform security checks because it is irrelevant for IMA.
  23  *
  24  */
  25 int integrity_kernel_read(struct file *file, loff_t offset,
  26                           void *addr, unsigned long count)
  27 {
  28         return __kernel_read(file, addr, count, &offset);
  29 }
  30
  31 /*
  32  * integrity_load_keys - load integrity keys hook
  33  *
  34  * Hooks is called from init/main.c:kernel_init_freeable()
  35  * when rootfs is ready
  36  */
  37 void __init integrity_load_keys(void)
  38 {
  39         ima_load_x509();
  40
  41         if (!IS_ENABLED(CONFIG_IMA_LOAD_X509))
  42                 evm_load_x509();
  43 }
  44
  45 static int __init integrity_fs_init(void)
  46 {
  47         integrity_dir = securityfs_create_dir("integrity", NULL);
  48         if (IS_ERR(integrity_dir)) {
  49                 int ret = PTR_ERR(integrity_dir);
  50
  51                 if (ret != -ENODEV)
  52                         pr_err("Unable to create integrity sysfs dir: %d\n",
  53                                ret);
  54                 integrity_dir = NULL;
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 late_initcall(integrity_fs_init)