// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* kernel/configs.c
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* Echo the kernel .config file used to build the kernel
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*
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* Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
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* Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
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* Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
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* Copyright (C) 2002 Hewlett-Packard Company
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/uaccess.h>
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/*
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* "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
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* a binary kernel image or a module. See scripts/extract-ikconfig.
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*/
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asm (
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" .pushsection .rodata, \"a\" \n"
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" .ascii \"IKCFG_ST\" \n"
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" .global kernel_config_data \n"
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"kernel_config_data: \n"
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" .incbin \"kernel/config_data.gz\" \n"
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" .global kernel_config_data_end \n"
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"kernel_config_data_end: \n"
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" .ascii \"IKCFG_ED\" \n"
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" .popsection \n"
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);
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#ifdef CONFIG_IKCONFIG_PROC
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extern char kernel_config_data;
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extern char kernel_config_data_end;
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static ssize_t
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ikconfig_read_current(struct file *file, char __user *buf,
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size_t len, loff_t * offset)
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{
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return simple_read_from_buffer(buf, len, offset,
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&kernel_config_data,
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&kernel_config_data_end -
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&kernel_config_data);
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}
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static const struct proc_ops config_gz_proc_ops = {
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.proc_read = ikconfig_read_current,
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.proc_lseek = default_llseek,
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};
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static int __init ikconfig_init(void)
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{
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struct proc_dir_entry *entry;
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/* create the current config file */
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entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
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&config_gz_proc_ops);
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if (!entry)
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return -ENOMEM;
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proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
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return 0;
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}
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static void __exit ikconfig_cleanup(void)
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{
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remove_proc_entry("config.gz", NULL);
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}
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module_init(ikconfig_init);
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module_exit(ikconfig_cleanup);
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#endif /* CONFIG_IKCONFIG_PROC */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Randy Dunlap");
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MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
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