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