Makefile0100664000175300003300000000021510145212142011472 0ustar jillljedit# Run this Makefile as follows: # (MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules obj-m := first.o kprobes.o call.o clean: rm -f *.ko *.o *.mod.c call.c0100664000175300003300000000101610145223424011116 0ustar jillljedit/* Filename: call.c */ #include #include extern int hello_to_debug(void); static void __exit exit_to_debug(void) { printk("\nModule exiting \n"); } static int __init init_to_debug(void) { printk("\nCalling the function \n"); hello_to_debug(); return 0; } module_init(init_to_debug); module_exit(exit_to_debug); MODULE_AUTHOR ("Krishnakumar. R, "); MODULE_DESCRIPTION ("Kprobes test module"); MODULE_LICENSE("GPL"); first.c0100664000175300003300000000123110145226300011325 0ustar jillljedit/* Filename: first.c */ #include #include int hello_to_debug(void) { printk("\nFrom the function - %s\n", __FUNCTION__); return 0; } static void exit_to_debug(void) { printk("\nModule exiting \n"); } static int init_to_debug(void) { printk("\nKeeping the function to debug" "\nat the kernel address %p\n", hello_to_debug); return 0; } EXPORT_SYMBOL(hello_to_debug); module_init(init_to_debug); module_exit(exit_to_debug); MODULE_AUTHOR ("Krishnakumar. R, "); MODULE_DESCRIPTION ("Kprobes test module"); MODULE_LICENSE("GPL"); kprobes.c0100664000175300003300000000361310145223416011656 0ustar jillljedit/* Filename: kprobes.c */ #include #include #include static struct kprobe kpr; extern int hello_to_debug(void); static void __exit exit_probe(void) { printk("\nModule exiting \n"); unregister_kprobe(&kpr); } static int before_hook(struct kprobe *kpr, struct pt_regs *p) { printk("\nBefore hook"); printk("\nThis is the Kprobe pre \n" "handler for instruction at \n" "%p\n", kpr->addr); printk("The registers are:\n"); printk("eax=%lx, ebx=%lx, ecx=%lx,\n " "edx=%lx\n", p->eax, p->ebx, p->ecx, p->edx); printk("eflags=%lx, esp=%lx\n", p->eflags, p->esp); return 0; } static int after_hook(struct kprobe *kpr, struct pt_regs *p, unsigned long flags) { printk("\nAfter hook"); printk("\nThis is the Kprobe post \n" "handler for instruction at" " %p\n", kpr->addr); printk("The registers are:\n"); printk("eax=%lx, ebx=%lx, ecx=%lx, \n" "edx=%lx\n", p->eax, p->ebx, p->ecx, p->edx); printk("eflags=%lx, esp=%lx\n", p->eflags, p->esp); return 0; } static int __init init_probe(void) { printk("\nInserting the kprobes \n"); /* Registering a kprobe */ kpr.pre_handler = (kprobe_pre_handler_t)before_hook; kpr.post_handler = (kprobe_post_handler_t)after_hook; kpr.addr = (kprobe_opcode_t *)(&hello_to_debug); printk("\nAddress where the kprobe is \n" "going to be inserted - %p \n", kpr.addr); register_kprobe(&kpr); return 0; } module_init(init_probe); module_exit(exit_probe); MODULE_AUTHOR ("Krishnakumar. R, "); MODULE_DESCRIPTION ("Kprobes test module"); MODULE_LICENSE("GPL");