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15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/kprobes.h>
18
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25
26static long jdo_fork(unsigned long clone_flags, unsigned long stack_start,
27 struct pt_regs *regs, unsigned long stack_size,
28 int __user *parent_tidptr, int __user *child_tidptr)
29{
30 printk(KERN_INFO "jprobe: clone_flags = 0x%lx, stack_size = 0x%lx,"
31 " regs = 0x%p\n",
32 clone_flags, stack_size, regs);
33
34
35 jprobe_return();
36 return 0;
37}
38
39static struct jprobe my_jprobe = {
40 .entry = jdo_fork,
41 .kp = {
42 .symbol_name = "do_fork",
43 },
44};
45
46static int __init jprobe_init(void)
47{
48 int ret;
49
50 ret = register_jprobe(&my_jprobe);
51 if (ret < 0) {
52 printk(KERN_INFO "register_jprobe failed, returned %d\n", ret);
53 return -1;
54 }
55 printk(KERN_INFO "Planted jprobe at %p, handler addr %p\n",
56 my_jprobe.kp.addr, my_jprobe.entry);
57 return 0;
58}
59
60static void __exit jprobe_exit(void)
61{
62 unregister_jprobe(&my_jprobe);
63 printk(KERN_INFO "jprobe at %p unregistered\n", my_jprobe.kp.addr);
64}
65
66module_init(jprobe_init)
67module_exit(jprobe_exit)
68MODULE_LICENSE("GPL");
69