mirror of
https://github.com/dynup/kpatch
synced 2024-12-12 00:14:35 +00:00
5b62d5f169
A simple kernel module for testing basic kernel module patching. Just run doit.sh from test/testmod. Signed-off-by: Seth Jennings <sjenning@redhat.com>
45 lines
906 B
C
45 lines
906 B
C
#define pr_fmt(fmt) "testmod: " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
static struct kobject *testmod_kobj;
|
|
int value = 2;
|
|
|
|
static ssize_t value_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", value);
|
|
}
|
|
|
|
static struct kobj_attribute testmod_value_attr = __ATTR_RO(value);
|
|
|
|
static int testmod_init(void)
|
|
{
|
|
int ret;
|
|
|
|
testmod_kobj = kobject_create_and_add("testmod", kernel_kobj);
|
|
if (!testmod_kobj)
|
|
return -ENOMEM;
|
|
|
|
ret = sysfs_create_file(testmod_kobj, &testmod_value_attr.attr);
|
|
if (ret) {
|
|
kobject_put(testmod_kobj);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void testmod_exit(void)
|
|
{
|
|
sysfs_remove_file(testmod_kobj, &testmod_value_attr.attr);
|
|
kobject_put(testmod_kobj);
|
|
}
|
|
|
|
module_init(testmod_init);
|
|
module_exit(testmod_exit);
|
|
MODULE_LICENSE("GPL");
|