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fix(windows): add experimental guest red-zone protection.

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Port the static instruction patcher from shadPS4.
This commit is contained in:
nmzik
2026-08-07 05:14:56 +02:00
parent d5c95bc3ee
commit 26781e6fea
18 changed files with 1840 additions and 107 deletions
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src/loader/runtimeLinker.cpp
+73 -1
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@@ -19,6 +19,7 @@
#include "loader/elf.h"
#include "loader/gamePatch.h"
#include "loader/jit.h"
#include "loader/redZonePatcher.h"
#include "loader/symbolDatabase.h"
#include "loader/x64InstructionEmulator.h"
@@ -2202,17 +2203,39 @@ void RuntimeLinker::LoadProgramToMemory(Program* program) {
EXIT_IF(tls_handler_size > UINT64_MAX - program->base_size_aligned);
program->mapped_size = program->base_size_aligned + tls_handler_size;
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
const bool use_red_zone_protection = Config::RedZoneProtectionEnabled();
constexpr uint64_t RED_ZONE_TRAMPOLINE_SIZE = 8u * 1024u * 1024u;
if (use_red_zone_protection) {
EXIT_IF(RED_ZONE_TRAMPOLINE_SIZE > UINT64_MAX - program->mapped_size);
program->mapped_size += RED_ZONE_TRAMPOLINE_SIZE;
}
#endif
program->base_vaddr = Libs::LibKernel::Memory::AllocateProgramMemory(
g_desired_base_addr, program->mapped_size, Common::VirtualMemory::Mode::ExecuteReadWrite,
Common::PathToString(program->file_name.filename()).c_str());
EXIT_IF(program->base_vaddr == 0);
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
if (use_red_zone_protection) {
program->red_zone_trampoline_vaddr = program->base_vaddr + program->base_size_aligned;
program->red_zone_trampoline_size = RED_ZONE_TRAMPOLINE_SIZE;
RegisterRedZonePatchModule(reinterpret_cast<void*>(program->base_vaddr),
program->base_size_aligned,
reinterpret_cast<void*>(program->red_zone_trampoline_vaddr),
program->red_zone_trampoline_size);
}
#endif
if (!is_shared) {
program->tls.handler_vaddr = program->base_vaddr + program->base_size_aligned;
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
program->tls.handler_vaddr += program->red_zone_trampoline_size;
#endif
}
g_desired_base_addr += CODE_BASE_INCR * (1 + program->mapped_size / CODE_BASE_INCR);
EXIT_IF(program->base_vaddr == 0);
EXIT_IF(program->base_size_aligned < program->base_size);
LOGF("base_vaddr = 0x%016" PRIx64 "\n"
"base_size = 0x%016" PRIx64 "\n"
@@ -2228,6 +2251,11 @@ void RuntimeLinker::LoadProgramToMemory(Program* program) {
}
// program->elf->SetBaseVAddr(program->base_vaddr);
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
std::vector<std::pair<uint64_t, uint64_t>> executable_segments;
uint64_t eh_frame_header_addr = 0;
uint64_t eh_frame_header_size = 0;
#endif
for (Elf64_Half i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_memsz != 0 && (phdr[i].p_type == PT_LOAD || phdr[i].p_type == PT_OS_RELRO)) {
@@ -2250,6 +2278,11 @@ void RuntimeLinker::LoadProgramToMemory(Program* program) {
if (Common::VirtualMemory::IsExecute(mode)) {
PatchProgram(program, segment_addr, segment_memory_size);
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
if (use_red_zone_protection) {
executable_segments.emplace_back(segment_addr, segment_file_size);
}
#endif
}
if (!skip_protect) {
@@ -2284,8 +2317,42 @@ void RuntimeLinker::LoadProgramToMemory(Program* program) {
program->proc_param_vaddr = phdr[i].p_vaddr + program->base_vaddr;
}
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
if (use_red_zone_protection && phdr[i].p_type == PT_GNU_EH_FRAME) {
eh_frame_header_addr = phdr[i].p_vaddr + program->base_vaddr;
eh_frame_header_size = phdr[i].p_memsz;
}
#endif
}
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
if (use_red_zone_protection) {
std::vector<uintptr_t> function_starts;
if (!DecodeEhFrameFunctionStarts(eh_frame_header_addr, eh_frame_header_size,
&function_starts)) {
LOGF("Windows guest red-zone patching could not decode function boundaries for %s\n",
Common::PathToString(program->file_name).c_str());
}
for (const auto& [segment_addr, segment_size]: executable_segments) {
const auto result =
PatchRedZoneMemoryInstructions(segment_addr, segment_size, function_starts);
LOGF("Windows guest red-zone patching: %s, functions=%" PRIu64 ", red_zone=%" PRIu64
", memory=%" PRIu64 ", patched=%" PRIu64 ", short=%" PRIu64 ", stack=%" PRIu64
", control=%" PRIu64 ", unrelocatable=%" PRIu64 "\n",
Common::PathToString(program->file_name.filename()).c_str(), result.function_count,
result.red_zone_function_count, result.memory_instruction_count,
result.patched_memory_instruction_count, result.short_memory_instruction_count,
result.stack_dependent_memory_instruction_count,
result.control_flow_memory_instruction_count,
result.unrelocatable_memory_instruction_count);
Common::VirtualMemory::FlushInstructionCache(segment_addr, segment_size);
}
Common::VirtualMemory::FlushInstructionCache(program->red_zone_trampoline_vaddr,
program->red_zone_trampoline_size);
}
#endif
if (!is_shared) {
SetupTlsHandler(program);
}
@@ -2311,6 +2378,11 @@ void RuntimeLinker::DeleteProgram(Program* p) {
if (program->base_vaddr != 0 || program->mapped_size != 0) {
EXIT_IF(program->base_vaddr == 0 || program->mapped_size == 0);
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
if (program->red_zone_trampoline_size != 0) {
UnregisterRedZonePatchModule(reinterpret_cast<void*>(program->base_vaddr));
}
#endif
EXIT_IF(
!Libs::LibKernel::Memory::FreeGuestMemory(program->base_vaddr, program->mapped_size));
}