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 #include <generated/utsrelease.h> 16 17 int fips_enabled; 18 EXPORT_SYMBOL_GPL(fips_enabled); 19 20 ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain); 21 EXPORT_SYMBOL_GPL(fips_fail_notif_chain); 22 23 /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */ 24 static int fips_enable(char *str) 25 { 26 fips_enabled = !!simple_strtol(str, NULL, 0); 27 printk(KERN_INFO "fips mode: %s\n", 28 fips_enabled ? "enabled" : "disabled"); 29 return 1; 30 } 31 32 __setup("fips=", fips_enable); 33 34 #define FIPS_MODULE_NAME CONFIG_CRYPTO_FIPS_NAME 35 #ifdef CONFIG_CRYPTO_FIPS_CUSTOM_VERSION 36 #define FIPS_MODULE_VERSION CONFIG_CRYPTO_FIPS_VERSION 37 #else 38 #define FIPS_MODULE_VERSION UTS_RELEASE 39 #endif 40 41 static char fips_name[] = FIPS_MODULE_NAME; 42 static char fips_version[] = FIPS_MODULE_VERSION; 43 44 static struct ctl_table crypto_sysctl_table[] = { 45 { 46 .procname = "fips_enabled", 47 .data = &fips_enabled, 48 .maxlen = sizeof(int), 49 .mode = 0444, 50 .proc_handler = proc_dointvec 51 }, 52 { 53 .procname = "fips_name", 54 .data = &fips_name, 55 .maxlen = 64, 56 .mode = 0444, 57 .proc_handler = proc_dostring 58 }, 59 { 60 .procname = "fips_version", 61 .data = &fips_version, 62 .maxlen = 64, 63 .mode = 0444, 64 .proc_handler = proc_dostring 65 }, 66 {} 67 }; 68 69 static struct ctl_table_header *crypto_sysctls; 70 71 static void crypto_proc_fips_init(void) 72 { 73 crypto_sysctls = register_sysctl("crypto", crypto_sysctl_table); 74 } 75 76 static void crypto_proc_fips_exit(void) 77 { 78 unregister_sysctl_table(crypto_sysctls); 79 } 80 81 void fips_fail_notify(void) 82 { 83 if (fips_enabled) 84 atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL); 85 } 86 EXPORT_SYMBOL_GPL(fips_fail_notify); 87 88 static int __init fips_init(void) 89 { 90 crypto_proc_fips_init(); 91 return 0; 92 } 93 94 static void __exit fips_exit(void) 95 { 96 crypto_proc_fips_exit(); 97 } 98 99 subsys_initcall(fips_init); 100 module_exit(fips_exit); 101