From 9b9b05eabf047942edb8a3c8846fc76b6592d310 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Tue, 5 Apr 2022 22:26:37 +0200
Subject: [PATCH] Kernel: Make sys$mmap() round requested VM size to page size
 multiple

This fixes an issue where File::mmap() overrides would fail because they
were expecting to be called with a size evenly divisible by PAGE_SIZE.
---
 Kernel/Syscalls/mmap.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index 8c95eb9a07..896616cd7f 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -195,7 +195,7 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<Syscall::SC_mmap_params const*> use
     if (map_fixed)
         TRY(address_space().unmap_mmap_range(VirtualAddress(addr), size));
 
-    Memory::VirtualRange requested_range { VirtualAddress { addr }, size };
+    Memory::VirtualRange requested_range { VirtualAddress { addr }, rounded_size };
     if (addr && !(map_fixed || map_fixed_noreplace)) {
         // If there's an address but MAP_FIXED wasn't specified, the address is just a hint.
         requested_range = { {}, 0 };