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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#include <windows.h>
#include "shared-libraries.h"
#include "nsWindowsHelpers.h"
#include "mozilla/NativeNt.h"
#include "mozilla/WindowsEnumProcessModules.h"
#include "mozilla/WindowsProcessMitigations.h"
#include "mozilla/WindowsVersion.h"
#include "nsPrintfCString.h"
static bool IsModuleUnsafeToLoad(const nsAString& aModuleName) {
#if defined(_M_AMD64) || defined(_M_IX86)
// Hackaround for Bug 1607574. Nvidia's shim driver nvd3d9wrap[x].dll detours
// LoadLibraryExW and it causes AV when the following conditions are met.
// 1. LoadLibraryExW was called for "detoured.dll"
// 2. nvinit[x].dll was unloaded
// 3. OS version is older than 6.2
# if defined(_M_AMD64)
LPCWSTR kNvidiaShimDriver = L"nvd3d9wrapx.dll";
LPCWSTR kNvidiaInitDriver = L"nvinitx.dll";
# elif defined(_M_IX86)
LPCWSTR kNvidiaShimDriver = L"nvd3d9wrap.dll";
LPCWSTR kNvidiaInitDriver = L"nvinit.dll";
# endif
if (aModuleName.LowerCaseEqualsLiteral("detoured.dll") &&
!mozilla::IsWin8OrLater() && ::GetModuleHandleW(kNvidiaShimDriver) &&
!::GetModuleHandleW(kNvidiaInitDriver)) {
return true;
#endif // defined(_M_AMD64) || defined(_M_IX86)
// Hackaround for Bug 1723868. There is no safe way to prevent the module
// Microsoft's VP9 Video Decoder from being unloaded because mfplat.dll may
// have posted more than one task to unload the module in the work queue
// without calling LoadLibrary.
if (aModuleName.LowerCaseEqualsLiteral("msvp9dec_store.dll")) {
return true;
return false;
SharedLibraryInfo SharedLibraryInfo::GetInfoForSelf() {
SharedLibraryInfo sharedLibraryInfo;
auto addSharedLibraryFromModuleInfo = [&sharedLibraryInfo](
const wchar_t* aModulePath,
HMODULE aModule) {
nsDependentSubstring moduleNameStr(
// If the module is unsafe to call LoadLibraryEx for, we skip.
if (IsModuleUnsafeToLoad(moduleNameStr)) {
// If EAF+ is enabled, parsing ntdll's PE header causes a crash.
if (mozilla::IsEafPlusEnabled() &&
moduleNameStr.LowerCaseEqualsLiteral("ntdll.dll")) {
// Load the module again to make sure that its handle will remain
// valid as we attempt to read the PDB information from it. We load the
// DLL as a datafile so that we don't end up running the newly loaded
// module's DllMain function. If the original handle |aModule| is valid,
// LoadLibraryEx just increments its refcount.
// LOAD_LIBRARY_AS_IMAGE_RESOURCE is needed to read information from the
// sections (not PE headers) which should be relocated by the loader,
// otherwise GetPdbInfo() will cause a crash.
nsModuleHandle handleLock(::LoadLibraryExW(
aModulePath, NULL,
if (!handleLock) {
mozilla::nt::PEHeaders headers(handleLock.get());
if (!headers) {
mozilla::Maybe<mozilla::Range<const uint8_t>> bounds = headers.GetBounds();
if (!bounds) {
// Put the original |aModule| into SharedLibrary, but we get debug info
// from |handleLock| as |aModule| might be inaccessible.
const uintptr_t modStart = reinterpret_cast<uintptr_t>(aModule);
const uintptr_t modEnd = modStart + bounds->length();
nsAutoCString breakpadId;
nsAutoString pdbPathStr;
if (const auto* debugInfo = headers.GetPdbInfo()) {
const GUID& pdbSig = debugInfo->pdbSignature;
"%08lX" // m0
"%04X%04X" // m1,m2
"%02X%02X%02X%02X%02X%02X%02X%02X" // m3
"%X", // pdbAge
pdbSig.Data1, pdbSig.Data2, pdbSig.Data3, pdbSig.Data4[0],
pdbSig.Data4[1], pdbSig.Data4[2], pdbSig.Data4[3], pdbSig.Data4[4],
pdbSig.Data4[5], pdbSig.Data4[6], pdbSig.Data4[7], debugInfo->pdbAge);
// The PDB file name could be different from module filename,
// so report both
// e.g. The PDB for C:\Windows\SysWOW64\ntdll.dll is wntdll.pdb
pdbPathStr = NS_ConvertUTF8toUTF16(debugInfo->pdbFileName);
nsAutoCString versionStr;
uint64_t version;
if (headers.GetVersionInfo(version)) {
static_cast<uint32_t>((version >> 48) & 0xFFFFu),
static_cast<uint32_t>((version >> 32) & 0xFFFFu),
static_cast<uint32_t>((version >> 16) & 0xFFFFu),
static_cast<uint32_t>(version & 0xFFFFu));
const nsString& pdbNameStr =
SharedLibrary shlib(modStart, modEnd,
0, // DLLs are always mapped at offset 0 on Windows
breakpadId, PromiseFlatString(moduleNameStr),
nsDependentString(aModulePath), pdbNameStr, pdbPathStr,
versionStr, "");
return sharedLibraryInfo;
void SharedLibraryInfo::Initialize() { /* do nothing */