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