mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
f7b101d330
The kheaders archive consisting of the kernel headers used for compiling bpf programs is in /proc. However there is concern that moving it here will make it permanent. Let us move it to /sys/kernel as discussed [1]. [1] https://lore.kernel.org/patchwork/patch/1067310/#1265969 Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
// 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/kobject.h>
|
|
#include <linux/init.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_t
|
|
ikheaders_read(struct file *file, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t off, size_t len)
|
|
{
|
|
memcpy(buf, &kernel_headers_data + off, len);
|
|
return len;
|
|
}
|
|
|
|
static struct bin_attribute kheaders_attr __ro_after_init = {
|
|
.attr = {
|
|
.name = "kheaders.tar.xz",
|
|
.mode = 0444,
|
|
},
|
|
.read = &ikheaders_read,
|
|
};
|
|
|
|
static int __init ikheaders_init(void)
|
|
{
|
|
kheaders_attr.size = (&kernel_headers_data_end -
|
|
&kernel_headers_data);
|
|
return sysfs_create_bin_file(kernel_kobj, &kheaders_attr);
|
|
}
|
|
|
|
static void __exit ikheaders_cleanup(void)
|
|
{
|
|
sysfs_remove_bin_file(kernel_kobj, &kheaders_attr);
|
|
}
|
|
|
|
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");
|