// SPDX-License-Identifier: GPL-2.0/* * Provide kernel headers useful to build tracing programs * such as for running eBPF tracing tools. * * (Borrowed code from kernel/configs.c) */ #include <linux/kernel.h>#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/init.h>#include <linux/uaccess.h> /* * Define kernel_headers_data and kernel_headers_data_end, within which the * compressed kernel headers are stored. The file is first compressed with xz. */ asm ("	.pushsection .rodata, \"a\"		\n""	.global kernel_headers_data		\n""kernel_headers_data:				\n""	.incbin \"kernel/kheaders_data.tar.xz\"	\n""	.global kernel_headers_data_end		\n""kernel_headers_data_end:			\n""	.popsection				\n"); extern char kernel_headers_data;extern char kernel_headers_data_end; static ssize_tikheaders_read_current(struct file *file, char __user *buf,		      size_t len, loff_t *offset){	return simple_read_from_buffer(buf, len, offset,				       &kernel_headers_data,				       &kernel_headers_data_end -				       &kernel_headers_data);} static const struct file_operations ikheaders_file_ops = {	.read = ikheaders_read_current,	.llseek = default_llseek,}; static int __init ikheaders_init(void){	struct proc_dir_entry *entry; 	/* create the current headers file */	entry = proc_create("kheaders.tar.xz", S_IRUGO, NULL,			    &ikheaders_file_ops);	if (!entry)		return -ENOMEM; 	proc_set_size(entry,		      &kernel_headers_data_end -		      &kernel_headers_data);	return 0;} static void __exit ikheaders_cleanup(void){	remove_proc_entry("kheaders.tar.xz", NULL);} module_init(ikheaders_init);module_exit(ikheaders_cleanup); MODULE_LICENSE("GPL v2");MODULE_AUTHOR("Joel Fernandes");MODULE_DESCRIPTION("Echo the kernel header artifacts used to build the kernel");