swh:1:snp:3c665ee4f67729f27f2e40193ab88e7298cf0fef
Tip revision: 1f93e4a96c9109378204c147b3eec0d0e8100fde authored by Linus Torvalds on 20 September 2015, 21:32:34 UTC
Linux 4.3-rc2
Linux 4.3-rc2
Tip revision: 1f93e4a
jprobe_example.c
/*
* Here's a sample kernel module showing the use of jprobes to dump
* the arguments of do_fork().
*
* For more information on theory of operation of jprobes, see
* Documentation/kprobes.txt
*
* Build and insert the kernel module as done in the kprobe example.
* You will see the trace data in /var/log/messages and on the
* console whenever do_fork() is invoked to create a new process.
* (Some messages may be suppressed if syslogd is configured to
* eliminate duplicate messages.)
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kprobes.h>
/*
* Jumper probe for do_fork.
* Mirror principle enables access to arguments of the probed routine
* from the probe handler.
*/
/* Proxy routine having the same arguments as actual do_fork() routine */
static long jdo_fork(unsigned long clone_flags, unsigned long stack_start,
unsigned long stack_size, int __user *parent_tidptr,
int __user *child_tidptr)
{
pr_info("jprobe: clone_flags = 0x%lx, stack_start = 0x%lx "
"stack_size = 0x%lx\n", clone_flags, stack_start, stack_size);
/* Always end with a call to jprobe_return(). */
jprobe_return();
return 0;
}
static struct jprobe my_jprobe = {
.entry = jdo_fork,
.kp = {
.symbol_name = "do_fork",
},
};
static int __init jprobe_init(void)
{
int ret;
ret = register_jprobe(&my_jprobe);
if (ret < 0) {
printk(KERN_INFO "register_jprobe failed, returned %d\n", ret);
return -1;
}
printk(KERN_INFO "Planted jprobe at %p, handler addr %p\n",
my_jprobe.kp.addr, my_jprobe.entry);
return 0;
}
static void __exit jprobe_exit(void)
{
unregister_jprobe(&my_jprobe);
printk(KERN_INFO "jprobe at %p unregistered\n", my_jprobe.kp.addr);
}
module_init(jprobe_init)
module_exit(jprobe_exit)
MODULE_LICENSE("GPL");