From 8b12d2387f6518c11428bb3bac181062d3d16803 Mon Sep 17 00:00:00 2001
From: kalaposfos13 <153381648+kalaposfos13@users.noreply.github.com>
Date: Wed, 16 Jul 2025 10:56:19 +0200
Subject: [PATCH] Add an unreachable on hitting ud2 instead of getting stuck in
 an infinite loop

---
 src/core/cpu_patches.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/core/cpu_patches.cpp b/src/core/cpu_patches.cpp
index e4f65cd31..d09d960f8 100644
--- a/src/core/cpu_patches.cpp
+++ b/src/core/cpu_patches.cpp
@@ -753,6 +753,9 @@ static bool PatchesIllegalInstructionHandler(void* context) {
             ZydisDecodedOperand operands[ZYDIS_MAX_OPERAND_COUNT];
             const auto status =
                 Common::Decoder::Instance()->decodeInstruction(instruction, operands, code_address);
+            if (ZYAN_SUCCESS(status) && instruction.mnemonic == ZydisMnemonic::ZYDIS_MNEMONIC_UD2) {
+                UNREACHABLE_MSG("ud2 at code address {:#x}", (u64)code_address);
+            }
             LOG_ERROR(Core, "Failed to patch address {:x} -- mnemonic: {}", (u64)code_address,
                       ZYAN_SUCCESS(status) ? ZydisMnemonicGetString(instruction.mnemonic)
                                            : "Failed to decode");