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 */
integrity_kernel_read(struct file * file,loff_t offset,void * addr,unsigned long count)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 */
integrity_load_keys(void)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
integrity_fs_init(void)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)
62