From 89502fc329cd9591f95741f234a86ab0928ea52a Mon Sep 17 00:00:00 2001
From: Rummskartoffel <Rummskartoffel@protonmail.com>
Date: Sat, 8 Jan 2022 20:46:59 +0100
Subject: [PATCH] UserspaceEmulator: Interpret zero-alignment as page-sized
 alignment

This commit fixes an issue where zero-alignment would lead to the
requested range being allocated outside of the total available range,
hitting an assert in RangeAllocator::allocate_anywhere().
---
 Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp b/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
index 6672409ef4..442efb2cbf 100644
--- a/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
+++ b/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
@@ -866,6 +866,7 @@ u32 Emulator::virt$mmap(u32 params_addr)
 {
     Syscall::SC_mmap_params params;
     mmu().copy_from_vm(&params, params_addr, sizeof(params));
+    params.alignment = params.alignment ? params.alignment : PAGE_SIZE;
 
     u32 requested_size = round_up_to_power_of_two(params.size, PAGE_SIZE);
     FlatPtr final_address;