| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * FIPS 200 support. |
| * |
| * Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com> |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/fips.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/sysctl.h> |
| #include <linux/notifier.h> |
| |
| int fips_enabled; |
| EXPORT_SYMBOL_GPL(fips_enabled); |
| |
| ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain); |
| EXPORT_SYMBOL_GPL(fips_fail_notif_chain); |
| |
| /* Process kernel command-line parameter at boot time. fips=0 or fips=1 */ |
| static int fips_enable(char *str) |
| { |
| fips_enabled = !!simple_strtol(str, NULL, 0); |
| printk(KERN_INFO "fips mode: %s\n", |
| fips_enabled ? "enabled" : "disabled"); |
| return 1; |
| } |
| |
| __setup("fips=", fips_enable); |
| |
| static struct ctl_table crypto_sysctl_table[] = { |
| { |
| .procname = "fips_enabled", |
| .data = &fips_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec |
| }, |
| {} |
| }; |
| |
| static struct ctl_table crypto_dir_table[] = { |
| { |
| .procname = "crypto", |
| .mode = 0555, |
| .child = crypto_sysctl_table |
| }, |
| {} |
| }; |
| |
| static struct ctl_table_header *crypto_sysctls; |
| |
| static void crypto_proc_fips_init(void) |
| { |
| crypto_sysctls = register_sysctl_table(crypto_dir_table); |
| } |
| |
| static void crypto_proc_fips_exit(void) |
| { |
| unregister_sysctl_table(crypto_sysctls); |
| } |
| |
| void fips_fail_notify(void) |
| { |
| if (fips_enabled) |
| atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL); |
| } |
| EXPORT_SYMBOL_GPL(fips_fail_notify); |
| |
| static int __init fips_init(void) |
| { |
| crypto_proc_fips_init(); |
| return 0; |
| } |
| |
| static void __exit fips_exit(void) |
| { |
| crypto_proc_fips_exit(); |
| } |
| |
| subsys_initcall(fips_init); |
| module_exit(fips_exit); |