1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * kernel/configs.c 2 * kernel/configs.c
4 * Echo the kernel .config file used to build 3 * Echo the kernel .config file used to build the kernel
5 * 4 *
6 * Copyright (C) 2002 Khalid Aziz <khalid_aziz 5 * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
7 * Copyright (C) 2002 Randy Dunlap <rdunlap@xe 6 * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
8 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com 7 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
9 * Copyright (C) 2002 Hewlett-Packard Company 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.
10 */ 24 */
11 25
12 #include <linux/kernel.h> 26 #include <linux/kernel.h>
13 #include <linux/module.h> 27 #include <linux/module.h>
14 #include <linux/proc_fs.h> 28 #include <linux/proc_fs.h>
15 #include <linux/seq_file.h> 29 #include <linux/seq_file.h>
16 #include <linux/init.h> 30 #include <linux/init.h>
17 #include <linux/uaccess.h> 31 #include <linux/uaccess.h>
18 32
>> 33 /**************************************************/
>> 34 /* the actual current config file */
>> 35
19 /* 36 /*
20 * "IKCFG_ST" and "IKCFG_ED" are used to extra !! 37 * Define kernel_config_data and kernel_config_data_size, which contains the
21 * a binary kernel image or a module. See scri !! 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
22 */ 45 */
23 asm ( !! 46 #define MAGIC_START "IKCFG_ST"
24 " .pushsection .rodata, \"a\" !! 47 #define MAGIC_END "IKCFG_ED"
25 " .ascii \"IKCFG_ST\" !! 48 #include "config_data.h"
26 " .global kernel_config_data <<
27 "kernel_config_data: <<
28 " .incbin \"kernel/config_data.gz\" <<
29 " .global kernel_config_data_end <<
30 "kernel_config_data_end: <<
31 " .ascii \"IKCFG_ED\" <<
32 " .popsection <<
33 ); <<
34 49
35 #ifdef CONFIG_IKCONFIG_PROC <<
36 50
37 extern char kernel_config_data; !! 51 #define MAGIC_SIZE (sizeof(MAGIC_START) - 1)
38 extern char kernel_config_data_end; !! 52 #define kernel_config_data_size \
>> 53 (sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2)
>> 54
>> 55 #ifdef CONFIG_IKCONFIG_PROC
39 56
40 static ssize_t 57 static ssize_t
41 ikconfig_read_current(struct file *file, char 58 ikconfig_read_current(struct file *file, char __user *buf,
42 size_t len, loff_t * off 59 size_t len, loff_t * offset)
43 { 60 {
44 return simple_read_from_buffer(buf, le 61 return simple_read_from_buffer(buf, len, offset,
45 &kernel !! 62 kernel_config_data + MAGIC_SIZE,
46 &kernel !! 63 kernel_config_data_size);
47 &kernel <<
48 } 64 }
49 65
50 static const struct proc_ops config_gz_proc_op !! 66 static const struct file_operations ikconfig_file_ops = {
51 .proc_read = ikconfig_read_curren !! 67 .owner = THIS_MODULE,
52 .proc_lseek = default_llseek, !! 68 .read = ikconfig_read_current,
>> 69 .llseek = default_llseek,
53 }; 70 };
54 71
55 static int __init ikconfig_init(void) 72 static int __init ikconfig_init(void)
56 { 73 {
57 struct proc_dir_entry *entry; 74 struct proc_dir_entry *entry;
58 75
59 /* create the current config file */ 76 /* create the current config file */
60 entry = proc_create("config.gz", S_IFR 77 entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
61 &config_gz_proc_op !! 78 &ikconfig_file_ops);
62 if (!entry) 79 if (!entry)
63 return -ENOMEM; 80 return -ENOMEM;
64 81
65 proc_set_size(entry, &kernel_config_da !! 82 proc_set_size(entry, kernel_config_data_size);
66 83
67 return 0; 84 return 0;
68 } 85 }
69 86
70 static void __exit ikconfig_cleanup(void) 87 static void __exit ikconfig_cleanup(void)
71 { 88 {
72 remove_proc_entry("config.gz", NULL); 89 remove_proc_entry("config.gz", NULL);
73 } 90 }
74 91
75 module_init(ikconfig_init); 92 module_init(ikconfig_init);
76 module_exit(ikconfig_cleanup); 93 module_exit(ikconfig_cleanup);
77 94
78 #endif /* CONFIG_IKCONFIG_PROC */ 95 #endif /* CONFIG_IKCONFIG_PROC */
79 96
80 MODULE_LICENSE("GPL"); 97 MODULE_LICENSE("GPL");
81 MODULE_AUTHOR("Randy Dunlap"); 98 MODULE_AUTHOR("Randy Dunlap");
82 MODULE_DESCRIPTION("Echo the kernel .config fi 99 MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
83 100
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