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-rw-r--r--kernel/kprobes.c69
1 files changed, 19 insertions, 50 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 6524252..90c0e82 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -240,12 +240,6 @@ static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
return 0;
}
-struct kprobe trampoline_p = {
- .addr = (kprobe_opcode_t *) &kretprobe_trampoline,
- .pre_handler = trampoline_probe_handler,
- .post_handler = trampoline_post_handler
-};
-
struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp)
{
struct hlist_node *node;
@@ -264,35 +258,18 @@ static struct kretprobe_instance *get_used_rp_inst(struct kretprobe *rp)
return NULL;
}
-struct kretprobe_instance *get_rp_inst(void *sara)
-{
- struct hlist_head *head;
- struct hlist_node *node;
- struct task_struct *tsk;
- struct kretprobe_instance *ri;
-
- tsk = arch_get_kprobe_task(sara);
- head = &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)];
- hlist_for_each_entry(ri, node, head, hlist) {
- if (ri->stack_addr == sara)
- return ri;
- }
- return NULL;
-}
-
void add_rp_inst(struct kretprobe_instance *ri)
{
- struct task_struct *tsk;
/*
* Remove rp inst off the free list -
* Add it back when probed function returns
*/
hlist_del(&ri->uflist);
- tsk = arch_get_kprobe_task(ri->stack_addr);
+
/* Add rp inst onto table */
INIT_HLIST_NODE(&ri->hlist);
hlist_add_head(&ri->hlist,
- &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)]);
+ &kretprobe_inst_table[hash_ptr(ri->task, KPROBE_HASH_BITS)]);
/* Also add this rp inst to the used list. */
INIT_HLIST_NODE(&ri->uflist);
@@ -319,34 +296,25 @@ struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk)
return &kretprobe_inst_table[hash_ptr(tsk, KPROBE_HASH_BITS)];
}
-struct kretprobe_instance *get_rp_inst_tsk(struct task_struct *tk)
-{
- struct task_struct *tsk;
- struct hlist_head *head;
- struct hlist_node *node;
- struct kretprobe_instance *ri;
-
- head = &kretprobe_inst_table[hash_ptr(tk, KPROBE_HASH_BITS)];
-
- hlist_for_each_entry(ri, node, head, hlist) {
- tsk = arch_get_kprobe_task(ri->stack_addr);
- if (tsk == tk)
- return ri;
- }
- return NULL;
-}
-
/*
- * This function is called from do_exit or do_execv when task tk's stack is
- * about to be recycled. Recycle any function-return probe instances
- * associated with this task. These represent probed functions that have
- * been called but may never return.
+ * This function is called from exit_thread or flush_thread when task tk's
+ * stack is being recycled so that we can recycle any function-return probe
+ * instances associated with this task. These left over instances represent
+ * probed functions that have been called but will never return.
*/
void kprobe_flush_task(struct task_struct *tk)
{
+ struct kretprobe_instance *ri;
+ struct hlist_head *head;
+ struct hlist_node *node, *tmp;
unsigned long flags = 0;
+
spin_lock_irqsave(&kprobe_lock, flags);
- arch_kprobe_flush_task(tk);
+ head = kretprobe_inst_table_head(current);
+ hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
+ if (ri->task == tk)
+ recycle_rp_inst(ri);
+ }
spin_unlock_irqrestore(&kprobe_lock, flags);
}
@@ -606,9 +574,10 @@ static int __init init_kprobes(void)
INIT_HLIST_HEAD(&kretprobe_inst_table[i]);
}
- err = register_die_notifier(&kprobe_exceptions_nb);
- /* Register the trampoline probe for return probe */
- register_kprobe(&trampoline_p);
+ err = arch_init();
+ if (!err)
+ err = register_die_notifier(&kprobe_exceptions_nb);
+
return err;
}
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