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https://github.com/torvalds/linux
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9552389c46
Crypto test failures in FIPS mode cause an immediate panic, but on some system the cryptographic boundary extends beyond just the Linux controlled domain. Add a simple atomic notification chain to allow interested parties to register to receive notification prior to us kicking the bucket. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* FIPS 200 support.
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*
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* Copyright (c) 2008 Neil Horman <nhorman@tuxdriver.com>
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*/
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#include <linux/export.h>
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#include <linux/fips.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sysctl.h>
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#include <linux/notifier.h>
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int fips_enabled;
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EXPORT_SYMBOL_GPL(fips_enabled);
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ATOMIC_NOTIFIER_HEAD(fips_fail_notif_chain);
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EXPORT_SYMBOL_GPL(fips_fail_notif_chain);
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/* Process kernel command-line parameter at boot time. fips=0 or fips=1 */
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static int fips_enable(char *str)
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{
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fips_enabled = !!simple_strtol(str, NULL, 0);
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printk(KERN_INFO "fips mode: %s\n",
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fips_enabled ? "enabled" : "disabled");
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return 1;
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}
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__setup("fips=", fips_enable);
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static struct ctl_table crypto_sysctl_table[] = {
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{
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.procname = "fips_enabled",
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.data = &fips_enabled,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = proc_dointvec
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},
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{}
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};
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static struct ctl_table crypto_dir_table[] = {
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{
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.procname = "crypto",
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.mode = 0555,
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.child = crypto_sysctl_table
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},
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{}
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};
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static struct ctl_table_header *crypto_sysctls;
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static void crypto_proc_fips_init(void)
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{
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crypto_sysctls = register_sysctl_table(crypto_dir_table);
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}
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static void crypto_proc_fips_exit(void)
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{
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unregister_sysctl_table(crypto_sysctls);
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}
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void fips_fail_notify(void)
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{
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if (fips_enabled)
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atomic_notifier_call_chain(&fips_fail_notif_chain, 0, NULL);
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}
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EXPORT_SYMBOL_GPL(fips_fail_notify);
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static int __init fips_init(void)
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{
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crypto_proc_fips_init();
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return 0;
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}
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static void __exit fips_exit(void)
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{
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crypto_proc_fips_exit();
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}
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subsys_initcall(fips_init);
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module_exit(fips_exit);
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