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Apply relocations manually on wine

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This commit is contained in:
Maurice Heumann 2022-12-03 16:29:51 +01:00
parent 0eb2f07a37
commit fc65e498bb
1 changed files with 70 additions and 2 deletions
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70
src/client/loader/loader.cpp
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@ -9,9 +9,16 @@ namespace loader
{ {
namespace namespace
{ {
template <typename T>
T offset_pointer(void* data, const ptrdiff_t offset)
{
return reinterpret_cast<T>(reinterpret_cast<uintptr_t>(data) + offset);
}
void load_imports(const utils::nt::library& target) void load_imports(const utils::nt::library& target)
{ {
const auto* const import_directory = &target.get_optional_header()->DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]; const auto* const import_directory = &target.get_optional_header()->DataDirectory[
IMAGE_DIRECTORY_ENTRY_IMPORT];
auto* descriptor = PIMAGE_IMPORT_DESCRIPTOR(target.get_ptr() + import_directory->VirtualAddress); auto* descriptor = PIMAGE_IMPORT_DESCRIPTOR(target.get_ptr() + import_directory->VirtualAddress);
@ -68,6 +75,66 @@ namespace loader
} }
} }
void load_relocations(const utils::nt::library& target)
{
if (!utils::nt::is_wine())
{
return;
}
auto* current_base = target.get_ptr();
const auto initial_base = target.get_optional_header()->ImageBase;
const auto delta = reinterpret_cast<ptrdiff_t>(current_base) - initial_base;
PIMAGE_DATA_DIRECTORY directory = &target.get_optional_header()->DataDirectory[
IMAGE_DIRECTORY_ENTRY_BASERELOC];
if (directory->Size == 0)
{
return;
}
auto* relocation = reinterpret_cast<PIMAGE_BASE_RELOCATION>(current_base + directory->VirtualAddress);
while (relocation->VirtualAddress > 0)
{
unsigned char* dest = current_base + relocation->VirtualAddress;
auto* rel_info = offset_pointer<uint16_t*>(relocation, sizeof(IMAGE_BASE_RELOCATION));
const auto* rel_info_end = offset_pointer<uint16_t*>(
rel_info, relocation->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION));
for (; rel_info < rel_info_end; ++rel_info)
{
const int type = *rel_info >> 12;
const int offset = *rel_info & 0xfff;
switch (type)
{
case IMAGE_REL_BASED_ABSOLUTE:
break;
case IMAGE_REL_BASED_HIGHLOW:
{
auto* patch_address = reinterpret_cast<DWORD*>(dest + offset);
utils::hook::set(patch_address, *patch_address + static_cast<DWORD>(delta));
break;
}
case IMAGE_REL_BASED_DIR64:
{
auto* patch_address = reinterpret_cast<ULONGLONG*>(dest + offset);
utils::hook::set(patch_address, *patch_address + static_cast<ULONGLONG>(delta));
break;
}
default:
throw std::runtime_error("Unknown relocation type: " + std::to_string(type));
}
}
relocation = offset_pointer<PIMAGE_BASE_RELOCATION>(relocation, relocation->SizeOfBlock);
}
}
void load_tls(const utils::nt::library& target) void load_tls(const utils::nt::library& target)
{ {
if (target.get_optional_header()->DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS].Size) if (target.get_optional_header()->DataDirectory[IMAGE_DIRECTORY_ENTRY_TLS].Size)
@ -110,6 +177,7 @@ namespace loader
throw std::runtime_error{"Failed to map: " + filename}; throw std::runtime_error{"Failed to map: " + filename};
} }
load_relocations(target);
load_imports(target); load_imports(target);
load_tls(target); load_tls(target);