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Diffstat (limited to 'kernel/events/uprobes.c')
-rw-r--r--kernel/events/uprobes.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 65429ad2ce51..6ab00e090c87 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1404,6 +1404,13 @@ static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs)
if (!utask)
return;
+ if (utask->depth >= MAX_URETPROBE_DEPTH) {
+ printk_ratelimited(KERN_INFO "uprobe: omit uretprobe due to"
+ " nestedness limit pid/tgid=%d/%d\n",
+ current->pid, current->tgid);
+ return;
+ }
+
ri = kzalloc(sizeof(struct return_instance), GFP_KERNEL);
if (!ri)
goto fail;
@@ -1439,6 +1446,8 @@ static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs)
ri->orig_ret_vaddr = orig_ret_vaddr;
ri->chained = chained;
+ utask->depth++;
+
/* add instance to the stack */
ri->next = utask->return_instances;
utask->return_instances = ri;
@@ -1681,6 +1690,8 @@ static bool handle_trampoline(struct pt_regs *regs)
if (!chained)
break;
+ utask->depth--;
+
BUG_ON(!ri);
}