diff options
Diffstat (limited to 'kernel/kprobes.c')
| -rw-r--r-- | kernel/kprobes.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 5beda378cc75..fde5a16a2913 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -462,9 +462,16 @@ int __kprobes register_kprobe(struct kprobe *p) int ret = 0; unsigned long flags = 0; struct kprobe *old_p; + struct module *mod; + + if ((!kernel_text_address((unsigned long) p->addr)) || + in_kprobes_functions((unsigned long) p->addr)) + return -EINVAL; + + if ((mod = module_text_address((unsigned long) p->addr)) && + (unlikely(!try_module_get(mod)))) + return -EINVAL; - if ((ret = in_kprobes_functions((unsigned long) p->addr)) != 0) - return ret; if ((ret = arch_prepare_kprobe(p)) != 0) goto rm_kprobe; @@ -488,6 +495,8 @@ out: rm_kprobe: if (ret == -EEXIST) arch_remove_kprobe(p); + if (ret && mod) + module_put(mod); return ret; } @@ -495,6 +504,7 @@ void __kprobes unregister_kprobe(struct kprobe *p) { unsigned long flags; struct kprobe *old_p; + struct module *mod; spin_lock_irqsave(&kprobe_lock, flags); old_p = get_kprobe(p->addr); @@ -506,6 +516,10 @@ void __kprobes unregister_kprobe(struct kprobe *p) cleanup_kprobe(p, flags); synchronize_sched(); + + if ((mod = module_text_address((unsigned long)p->addr))) + module_put(mod); + if (old_p->pre_handler == aggr_pre_handler && list_empty(&old_p->list)) kfree(old_p); |