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pf_probe_A.c
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pf_probe_A.c
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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
static int pid = 1;
module_param(pid,int,0);
/* For each probe you need to allocate a kprobe structure */
static struct kprobe kp = {
.symbol_name = "handle_mm_fault",
};
/* kprobe pre_handler: called just before the probed instruction is executed */
static int handler_pre(struct kprobe *p, struct pt_regs *regs)
{
#ifdef CONFIG_X86
if(current -> pid == pid){
printk(KERN_INFO "pid = %d,page_fault_addr = %ld\n",pid,regs -> si);}
#endif
/* A dump_stack() here will give a stack backtrace */
return 0;
}
/* kprobe post_handler: called after the probed instruction is executed */
static void handler_post(struct kprobe *p, struct pt_regs *regs,
unsigned long flags)
{
#ifdef CONFIG_X86
if(current -> pid == pid){
printk(KERN_INFO "pid = %d,page_fault_addr = %ld\n",pid,regs -> si);}
#endif
}
/*
* fault_handler: this is called if an exception is generated for any
* instruction within the pre- or post-handler, or when Kprobes
* single-steps the probed instruction.
*/
static int handler_fault(struct kprobe *p, struct pt_regs *regs, int trapnr)
{
printk(KERN_INFO "fault_handler: p->addr = 0x%p,trap #%dn",p->addr,trapnr);
/* Return 0 because we don't handle the fault. */
return 0;
}
static int __init kprobe_init(void)
{
int ret;
kp.fault_handler = handler_fault;
kp.pre_handler = handler_pre;
kp.post_handler = handler_post;
ret = register_kprobe(&kp);
if (ret < 0) {
pr_err("register_kprobe failed, returned %d\n", ret);
return ret;
}
printk(KERN_INFO "Planted kprobe at %p\n", kp.addr);
return 0;
}
static void __exit kprobe_exit(void)
{
unregister_kprobe(&kp);
printk(KERN_INFO "kprobe at %p unregistered\n", kp.addr);
}
module_init(kprobe_init)
module_exit(kprobe_exit)
MODULE_LICENSE("GPL");