linux/security/lockdown/lockdown.c

// SPDX-License-Identifier: GPL-2.0
/* Lock down the kernel
 *
 * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#include <linux/security.h>
#include <linux/export.h>
#include <linux/lsm_hooks.h>
#include <uapi/linux/lsm.h>

static enum lockdown_reason kernel_locked_down;

static const enum lockdown_reason lockdown_levels[] = …;

/*
 * Put the kernel into lock-down mode.
 */
static int lock_kernel_down(const char *where, enum lockdown_reason level)
{ … }

static int __init lockdown_param(char *level)
{ … }

early_param(…);

/**
 * lockdown_is_locked_down - Find out if the kernel is locked down
 * @what: Tag to use in notice generated if lockdown is in effect
 */
static int lockdown_is_locked_down(enum lockdown_reason what)
{ … }

static struct security_hook_list lockdown_hooks[] __ro_after_init = …;

static const struct lsm_id lockdown_lsmid = …;

static int __init lockdown_lsm_init(void)
{ … }

static ssize_t lockdown_read(struct file *filp, char __user *buf, size_t count,
			     loff_t *ppos)
{ … }

static ssize_t lockdown_write(struct file *file, const char __user *buf,
			      size_t n, loff_t *ppos)
{ … }

static const struct file_operations lockdown_ops = …;

static int __init lockdown_secfs_init(void)
{ … }

core_initcall(lockdown_secfs_init);

#ifdef CONFIG_SECURITY_LOCKDOWN_LSM_EARLY
DEFINE_EARLY_LSM(lockdown) = …;