From b0b51c3955dab267670b48055cc419bc29c60c88 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Tue, 2 Feb 2021 16:05:18 +0100
Subject: [PATCH] Kernel: Limit the size of stack traces

Let's not allow infinitely long stack traces. Cap it at 4096 frames.
---
 Kernel/Arch/i386/CPU.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Kernel/Arch/i386/CPU.cpp b/Kernel/Arch/i386/CPU.cpp
index 7dc7f082c6..e147a644e0 100644
--- a/Kernel/Arch/i386/CPU.cpp
+++ b/Kernel/Arch/i386/CPU.cpp
@@ -1161,9 +1161,10 @@ Vector<FlatPtr> Processor::capture_stack_trace(Thread& thread, size_t max_frames
 
     auto walk_stack = [&](FlatPtr stack_ptr)
     {
+        static constexpr size_t max_stack_frames = 4096;
         stack_trace.append(eip);
         size_t count = 1;
-        while (stack_ptr) {
+        while (stack_ptr && stack_trace.size() < max_stack_frames) {
             FlatPtr retaddr;
 
             count++;