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-rw-r--r--kernel/kprobes.c18
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);
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