1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2024 Marcos Paulo de Souza <mpdesouza@suse.com> 3 // Copyright (C) 2024 Michael Vetter <mvetter@suse.com> 4 5 #include <linux/kernel.h> 6 #include <linux/module.h> 7 #include <linux/kprobes.h> 8 9 static bool has_post_handler = true; 10 module_param(has_post_handler, bool, 0444); 11 12 static void __kprobes post_handler(struct kprobe *p, struct pt_regs *regs, 13 unsigned long flags) 14 { 15 } 16 17 static struct kprobe kp = { 18 .symbol_name = "cmdline_proc_show", 19 }; 20 21 static int __init kprobe_init(void) 22 { 23 if (has_post_handler) 24 kp.post_handler = post_handler; 25 26 return register_kprobe(&kp); 27 } 28 29 static void __exit kprobe_exit(void) 30 { 31 unregister_kprobe(&kp); 32 } 33 34 module_init(kprobe_init) 35 module_exit(kprobe_exit) 36 MODULE_LICENSE("GPL"); 37 MODULE_AUTHOR("Michael Vetter <mvetter@suse.com>"); 38 MODULE_DESCRIPTION("Livepatch test: kprobe function"); 39