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-rw-r--r--kernel/kprobes.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 5beda37..3bb71e6 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -246,6 +246,19 @@ static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
return ret;
}
+/* Walks the list and increments nmissed count for multiprobe case */
+void __kprobes kprobes_inc_nmissed_count(struct kprobe *p)
+{
+ struct kprobe *kp;
+ if (p->pre_handler != aggr_pre_handler) {
+ p->nmissed++;
+ } else {
+ list_for_each_entry_rcu(kp, &p->list, list)
+ kp->nmissed++;
+ }
+ return;
+}
+
/* Called with kretprobe_lock held */
struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp)
{
@@ -399,10 +412,7 @@ static inline void add_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
INIT_LIST_HEAD(&ap->list);
list_add_rcu(&p->list, &ap->list);
- INIT_HLIST_NODE(&ap->hlist);
- hlist_del_rcu(&p->hlist);
- hlist_add_head_rcu(&ap->hlist,
- &kprobe_table[hash_ptr(ap->addr, KPROBE_HASH_BITS)]);
+ hlist_replace_rcu(&p->hlist, &ap->hlist);
}
/*
@@ -462,9 +472,16 @@ 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 +505,8 @@ out:
rm_kprobe:
if (ret == -EEXIST)
arch_remove_kprobe(p);
+ if (ret && mod)
+ module_put(mod);
return ret;
}
@@ -495,6 +514,7 @@ 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 +526,10 @@ 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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