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kheaders: Move from proc to sysfs

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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>
This commit is contained in:
Joel Fernandes (Google)
2019-05-15 17:35:51 -04:00
committed by Greg Kroah-Hartman
parent a188339ca5
commit f7b101d330
4 changed files with 26 additions and 35 deletions
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40
kernel/kheaders.c
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@@ -8,9 +8,8 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kobject.h>
#include <linux/init.h>
#include <linux/uaccess.h>
/*
* Define kernel_headers_data and kernel_headers_data_end, within which the
@@ -31,39 +30,32 @@ extern char kernel_headers_data;
extern char kernel_headers_data_end;
static ssize_t
ikheaders_read_current(struct file *file, char __user *buf,
size_t len, loff_t *offset)
ikheaders_read(struct file *file, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t len)
{
return simple_read_from_buffer(buf, len, offset,
&kernel_headers_data,
&kernel_headers_data_end -
&kernel_headers_data);
memcpy(buf, &kernel_headers_data + off, len);
return len;
}
static const struct file_operations ikheaders_file_ops = {
.read = ikheaders_read_current,
.llseek = default_llseek,
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)
{
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;
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)
{
remove_proc_entry("kheaders.tar.xz", NULL);
sysfs_remove_bin_file(kernel_kobj, &kheaders_attr);
}
module_init(ikheaders_init);