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v4.17
 
 1/*
 2 * kernel/configs.c
 3 * Echo the kernel .config file used to build the kernel
 4 *
 5 * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
 6 * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
 7 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
 8 * Copyright (C) 2002 Hewlett-Packard Company
 9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT.  See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/proc_fs.h>
29#include <linux/seq_file.h>
30#include <linux/init.h>
31#include <linux/uaccess.h>
32
33/**************************************************/
34/* the actual current config file                 */
35
36/*
37 * Define kernel_config_data and kernel_config_data_size, which contains the
38 * wrapped and compressed configuration file.  The file is first compressed
39 * with gzip and then bounded by two eight byte magic numbers to allow
40 * extraction from a binary kernel image:
41 *
42 *   IKCFG_ST
43 *   <image>
44 *   IKCFG_ED
45 */
46#define MAGIC_START	"IKCFG_ST"
47#define MAGIC_END	"IKCFG_ED"
48#include "config_data.h"
49
50
51#define MAGIC_SIZE (sizeof(MAGIC_START) - 1)
52#define kernel_config_data_size \
53	(sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2)
 
 
 
54
55#ifdef CONFIG_IKCONFIG_PROC
56
 
 
 
57static ssize_t
58ikconfig_read_current(struct file *file, char __user *buf,
59		      size_t len, loff_t * offset)
60{
61	return simple_read_from_buffer(buf, len, offset,
62				       kernel_config_data + MAGIC_SIZE,
63				       kernel_config_data_size);
 
64}
65
66static const struct file_operations ikconfig_file_ops = {
67	.owner = THIS_MODULE,
68	.read = ikconfig_read_current,
69	.llseek = default_llseek,
70};
71
72static int __init ikconfig_init(void)
73{
74	struct proc_dir_entry *entry;
75
76	/* create the current config file */
77	entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
78			    &ikconfig_file_ops);
79	if (!entry)
80		return -ENOMEM;
81
82	proc_set_size(entry, kernel_config_data_size);
83
84	return 0;
85}
86
87static void __exit ikconfig_cleanup(void)
88{
89	remove_proc_entry("config.gz", NULL);
90}
91
92module_init(ikconfig_init);
93module_exit(ikconfig_cleanup);
94
95#endif /* CONFIG_IKCONFIG_PROC */
96
97MODULE_LICENSE("GPL");
98MODULE_AUTHOR("Randy Dunlap");
99MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
v6.8
 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * kernel/configs.c
 4 * Echo the kernel .config file used to build the kernel
 5 *
 6 * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
 7 * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
 8 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
 9 * Copyright (C) 2002 Hewlett-Packard Company
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/proc_fs.h>
15#include <linux/seq_file.h>
16#include <linux/init.h>
17#include <linux/uaccess.h>
18
 
 
 
19/*
20 * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
21 * a binary kernel image or a module. See scripts/extract-ikconfig.
 
 
 
 
 
 
22 */
23asm (
24"	.pushsection .rodata, \"a\"		\n"
25"	.ascii \"IKCFG_ST\"			\n"
26"	.global kernel_config_data		\n"
27"kernel_config_data:				\n"
28"	.incbin \"kernel/config_data.gz\"	\n"
29"	.global kernel_config_data_end		\n"
30"kernel_config_data_end:			\n"
31"	.ascii \"IKCFG_ED\"			\n"
32"	.popsection				\n"
33);
34
35#ifdef CONFIG_IKCONFIG_PROC
36
37extern char kernel_config_data;
38extern char kernel_config_data_end;
39
40static ssize_t
41ikconfig_read_current(struct file *file, char __user *buf,
42		      size_t len, loff_t * offset)
43{
44	return simple_read_from_buffer(buf, len, offset,
45				       &kernel_config_data,
46				       &kernel_config_data_end -
47				       &kernel_config_data);
48}
49
50static const struct proc_ops config_gz_proc_ops = {
51	.proc_read	= ikconfig_read_current,
52	.proc_lseek	= default_llseek,
 
53};
54
55static int __init ikconfig_init(void)
56{
57	struct proc_dir_entry *entry;
58
59	/* create the current config file */
60	entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
61			    &config_gz_proc_ops);
62	if (!entry)
63		return -ENOMEM;
64
65	proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
66
67	return 0;
68}
69
70static void __exit ikconfig_cleanup(void)
71{
72	remove_proc_entry("config.gz", NULL);
73}
74
75module_init(ikconfig_init);
76module_exit(ikconfig_cleanup);
77
78#endif /* CONFIG_IKCONFIG_PROC */
79
80MODULE_LICENSE("GPL");
81MODULE_AUTHOR("Randy Dunlap");
82MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");