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