From 35b7839ec850a7ca2d2ee40b344430acb667dcaf Mon Sep 17 00:00:00 2001
From: momo5502 <mauriceheumann@gmail.com>
Date: Tue, 23 Dec 2025 10:50:07 +0100
Subject: [PATCH] Support section offsets

---
 src/windows-emulator/syscalls/section.cpp | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/windows-emulator/syscalls/section.cpp b/src/windows-emulator/syscalls/section.cpp
index 6d012794..178bba59 100644
--- a/src/windows-emulator/syscalls/section.cpp
+++ b/src/windows-emulator/syscalls/section.cpp
@@ -248,7 +248,7 @@ namespace syscalls
                                        const emulator_object<uint64_t> base_address,
                                        const EMULATOR_CAST(EmulatorTraits<Emu64>::ULONG_PTR, ULONG_PTR) /*zero_bits*/,
                                        const EMULATOR_CAST(EmulatorTraits<Emu64>::SIZE_T, SIZE_T) /*commit_size*/,
-                                       const emulator_object<LARGE_INTEGER> /*section_offset*/,
+                                       const emulator_object<LARGE_INTEGER> section_offset,
                                        const emulator_object<EMULATOR_CAST(EmulatorTraits<Emu64>::SIZE_T, SIZE_T)> view_size,
                                        const SECTION_INHERIT /*inherit_disposition*/, const ULONG /*allocation_type*/,
                                        const ULONG /*win32_protect*/)
@@ -353,6 +353,13 @@ namespace syscalls
         uint64_t size = section_entry->maximum_size;
         std::vector<std::byte> file_data{};
 
+        int64_t offset = 0;
+        if (section_offset)
+        {
+            offset = section_offset.read().QuadPart;
+            offset = std::max<int64_t>(offset, 0);
+        }
+
         if (!section_entry->file_name.empty())
         {
             if (!utils::io::read_file(c.win_emu.file_sys.translate(section_entry->file_name), &file_data))
@@ -360,21 +367,22 @@ namespace syscalls
                 return STATUS_INVALID_PARAMETER;
             }
 
-            size = page_align_up(file_data.size());
+            size = file_data.size() - offset;
         }
 
+        const auto aligned_size = page_align_up(size);
         const auto reserve_only = section_entry->allocation_attributes == SEC_RESERVE;
         const auto protection = map_nt_to_emulator_protection(section_entry->section_page_protection);
-        const auto address = c.win_emu.memory.allocate_memory(static_cast<size_t>(size), protection, reserve_only);
+        const auto address = c.win_emu.memory.allocate_memory(static_cast<size_t>(aligned_size), protection, reserve_only);
 
         if (!reserve_only && !file_data.empty())
         {
-            c.emu.write_memory(address, file_data.data(), file_data.size());
+            c.emu.write_memory(address, file_data.data() + offset, size);
         }
 
         if (view_size)
         {
-            view_size.write(size);
+            view_size.write(aligned_size);
         }
 
         base_address.write(address);