1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * FIPS 200 support.
4  *
5  * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
6  */
7 
8 #include <linux/export.h>
9 #include <linux/fips.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/sysctl.h>
14 #include <linux/notifier.h>
15 
16 int fips_enabled;
17 EXPORT_SYMBOL_GPL(fips_enabled);
18 
19 ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
20 EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
21 
22 /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
fips_enable(char * str)23 static int fips_enable(char *str)
24 {
25 	fips_enabled = !!simple_strtol(str, NULL, 0);
26 	printk(KERN_INFO "fips mode: %s\n",
27 		fips_enabled ? "enabled" : "disabled");
28 	return 1;
29 }
30 
31 __setup("fips=", fips_enable);
32 
33 static struct ctl_table crypto_sysctl_table[] = {
34 	{
35 		.procname       = "fips_enabled",
36 		.data           = &fips_enabled,
37 		.maxlen         = sizeof(int),
38 		.mode           = 0444,
39 		.proc_handler   = proc_dointvec
40 	},
41 	{}
42 };
43 
44 static struct ctl_table crypto_dir_table[] = {
45 	{
46 		.procname       = "crypto",
47 		.mode           = 0555,
48 		.child          = crypto_sysctl_table
49 	},
50 	{}
51 };
52 
53 static struct ctl_table_header *crypto_sysctls;
54 
crypto_proc_fips_init(void)55 static void crypto_proc_fips_init(void)
56 {
57 	crypto_sysctls = register_sysctl_table(crypto_dir_table);
58 }
59 
crypto_proc_fips_exit(void)60 static void crypto_proc_fips_exit(void)
61 {
62 	unregister_sysctl_table(crypto_sysctls);
63 }
64 
fips_fail_notify(void)65 void fips_fail_notify(void)
66 {
67 	if (fips_enabled)
68 		atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
69 }
70 EXPORT_SYMBOL_GPL(fips_fail_notify);
71 
fips_init(void)72 static int __init fips_init(void)
73 {
74 	crypto_proc_fips_init();
75 	return 0;
76 }
77 
fips_exit(void)78 static void __exit fips_exit(void)
79 {
80 	crypto_proc_fips_exit();
81 }
82 
83 subsys_initcall(fips_init);
84 module_exit(fips_exit);
85