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/* -*- Mode: C++; tab-width: 40; 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
#include <windows.h>
#include <winternl.h>
#pragma warning(push)
#pragma warning(disable : 4275 4530) // See msvc-stl-wrapper.template.h
#include <map>
#pragma warning(pop)
#include "Authenticode.h"
#include "BaseProfiler.h"
#include "nsWindowsDllInterceptor.h"
#include "mozilla/CmdLineAndEnvUtils.h"
#include "mozilla/StackWalk_windows.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Vector.h"
#include "mozilla/WindowsProcessMitigations.h"
#include "mozilla/WindowsVersion.h"
#include "mozilla/WinHeaderOnlyUtils.h"
#include "nsWindowsHelpers.h"
#include "WindowsDllBlocklist.h"
#include "mozilla/AutoProfilerLabel.h"
#include "mozilla/glue/Debug.h"
#include "mozilla/glue/WindowsDllServices.h"
#include "mozilla/glue/WinUtils.h"
// Start new implementation
#include "LoaderObserver.h"
#include "ModuleLoadFrame.h"
#include "mozilla/glue/WindowsUnicode.h"
namespace mozilla {
glue::Win32SRWLock gDllServicesLock;
glue::detail::DllServicesBase* gDllServices;
} // namespace mozilla
using namespace mozilla;
#define DLL_BLOCKLIST_ENTRY(name, ...) {name, __VA_ARGS__},
#define DLL_BLOCKLIST_STRING_TYPE const char*
#include "mozilla/WindowsDllBlocklistLegacyDefs.h"
// define this for very verbose dll load debug spew
#undef DEBUG_very_verbose
using WritableBuffer = mozilla::glue::detail::WritableBuffer<1024>;
static uint32_t sInitFlags;
static bool sBlocklistInitAttempted;
static bool sBlocklistInitFailed;
static bool sUser32BeforeBlocklist;
MOZ_RUNINIT static WritableBuffer sBlocklistWriter;
typedef MOZ_NORETURN_PTR void(__fastcall* BaseThreadInitThunk_func)(
BOOL aIsInitialThread, void* aStartAddress, void* aThreadParam);
static WindowsDllInterceptor::FuncHookType<BaseThreadInitThunk_func>
stub_BaseThreadInitThunk;
typedef NTSTATUS(NTAPI* LdrLoadDll_func)(PWCHAR filePath, PULONG flags,
PUNICODE_STRING moduleFileName,
PHANDLE handle);
static WindowsDllInterceptor::FuncHookType<LdrLoadDll_func> stub_LdrLoadDll;
template <class T>
struct RVAMap {
RVAMap(HANDLE map, DWORD offset) {
SYSTEM_INFO info;
GetSystemInfo(&info);
DWORD alignedOffset =
(offset / info.dwAllocationGranularity) * info.dwAllocationGranularity;
MOZ_ASSERT(offset - alignedOffset < info.dwAllocationGranularity, "Wtf");
mRealView = ::MapViewOfFile(map, FILE_MAP_READ, 0, alignedOffset,
sizeof(T) + (offset - alignedOffset));
mMappedView =
mRealView
? reinterpret_cast<T*>((char*)mRealView + (offset - alignedOffset))
: nullptr;
}
~RVAMap() {
if (mRealView) {
::UnmapViewOfFile(mRealView);
}
}
operator const T*() const { return mMappedView; }
const T* operator->() const { return mMappedView; }
private:
const T* mMappedView;
void* mRealView;
};
static DWORD GetTimestamp(const wchar_t* path) {
DWORD timestamp = 0;
HANDLE file = ::CreateFileW(path, GENERIC_READ, FILE_SHARE_READ, nullptr,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
if (file != INVALID_HANDLE_VALUE) {
HANDLE map =
::CreateFileMappingW(file, nullptr, PAGE_READONLY, 0, 0, nullptr);
if (map) {
RVAMap<IMAGE_DOS_HEADER> peHeader(map, 0);
if (peHeader) {
RVAMap<IMAGE_NT_HEADERS> ntHeader(map, peHeader->e_lfanew);
if (ntHeader) {
timestamp = ntHeader->FileHeader.TimeDateStamp;
}
}
::CloseHandle(map);
}
::CloseHandle(file);
}
return timestamp;
}
// This lock protects both the reentrancy sentinel and the crash reporter
// data structures.
static CRITICAL_SECTION sLock;
/**
* Some versions of Windows call LoadLibraryEx to get the version information
* for a DLL, which causes our patched LdrLoadDll implementation to re-enter
* itself and cause infinite recursion and a stack-exhaustion crash. We protect
* against reentrancy by allowing recursive loads of the same DLL.
*
* Note that we don't use __declspec(thread) because that doesn't work in DLLs
* loaded via LoadLibrary and there can be a limited number of TLS slots, so
* we roll our own.
*/
class ReentrancySentinel {
public:
explicit ReentrancySentinel(const char* dllName) {
DWORD currentThreadId = GetCurrentThreadId();
AutoCriticalSection lock(&sLock);
mPreviousDllName = (*sThreadMap)[currentThreadId];
// If there is a DLL currently being loaded and it has the same name
// as the current attempt, we're re-entering.
mReentered = mPreviousDllName && !stricmp(mPreviousDllName, dllName);
(*sThreadMap)[currentThreadId] = dllName;
}
~ReentrancySentinel() {
DWORD currentThreadId = GetCurrentThreadId();
AutoCriticalSection lock(&sLock);
(*sThreadMap)[currentThreadId] = mPreviousDllName;
}
bool BailOut() const { return mReentered; };
static void InitializeStatics() {
InitializeCriticalSection(&sLock);
sThreadMap = new std::map<DWORD, const char*>;
}
private:
static std::map<DWORD, const char*>* sThreadMap;
const char* mPreviousDllName;
bool mReentered;
};
std::map<DWORD, const char*>* ReentrancySentinel::sThreadMap;
/**
* This is a linked list of DLLs that have been blocked. It doesn't use
* mozilla::LinkedList because this is an append-only list and doesn't need
* to be doubly linked.
*/
class DllBlockSet {
public:
static void Add(const char* name, unsigned long long version);
// Write the list of blocked DLLs to a WritableBuffer object. This method is
// run after a crash occurs and must therefore not use the heap, etc.
static void Write(WritableBuffer& buffer);
private:
DllBlockSet(const char* name, unsigned long long version)
: mName(name), mVersion(version), mNext(nullptr) {}
const char* mName; // points into the gWindowsDllBlocklist string
unsigned long long mVersion;
DllBlockSet* mNext;
static DllBlockSet* gFirst;
};
DllBlockSet* DllBlockSet::gFirst;
void DllBlockSet::Add(const char* name, unsigned long long version) {
AutoCriticalSection lock(&sLock);
for (DllBlockSet* b = gFirst; b; b = b->mNext) {
if (0 == strcmp(b->mName, name) && b->mVersion == version) {
return;
}
}
// Not already present
DllBlockSet* n = new DllBlockSet(name, version);
n->mNext = gFirst;
gFirst = n;
}
void DllBlockSet::Write(WritableBuffer& buffer) {
// It would be nicer to use AutoCriticalSection here. However, its destructor
// might not run if an exception occurs, in which case we would never leave
// the critical section. (MSVC warns about this possibility.) So we
// enter and leave manually.
::EnterCriticalSection(&sLock);
// Because this method is called after a crash occurs, and uses heap memory,
// protect this entire block with a structured exception handler.
MOZ_SEH_TRY {
for (DllBlockSet* b = gFirst; b; b = b->mNext) {
// write name[,v.v.v.v];
buffer.Write(b->mName, strlen(b->mName));
if (b->mVersion != DllBlockInfo::ALL_VERSIONS) {
buffer.Write(",", 1);
uint16_t parts[4];
parts[0] = b->mVersion >> 48;
parts[1] = (b->mVersion >> 32) & 0xFFFF;
parts[2] = (b->mVersion >> 16) & 0xFFFF;
parts[3] = b->mVersion & 0xFFFF;
for (int p = 0; p < 4; ++p) {
char buf[32];
_ltoa_s(parts[p], buf, sizeof(buf), 10);
buffer.Write(buf, strlen(buf));
if (p != 3) {
buffer.Write(".", 1);
}
}
}
buffer.Write(";", 1);
}
}
MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {}
::LeaveCriticalSection(&sLock);
}
static UniquePtr<wchar_t[]> getFullPath(PWCHAR filePath, wchar_t* fname) {
// In Windows 8, the first parameter seems to be used for more than just the
// path name. For example, its numerical value can be 1. Passing a non-valid
// pointer to SearchPathW will cause a crash, so we need to check to see if we
// are handed a valid pointer, and otherwise just pass nullptr to SearchPathW.
PWCHAR sanitizedFilePath = nullptr;
if ((uintptr_t(filePath) >= 65536) && ((uintptr_t(filePath) & 1) == 0)) {
sanitizedFilePath = filePath;
}
// figure out the length of the string that we need
DWORD pathlen =
SearchPathW(sanitizedFilePath, fname, L".dll", 0, nullptr, nullptr);
if (pathlen == 0) {
return nullptr;
}
auto full_fname = MakeUnique<wchar_t[]>(pathlen + 1);
if (!full_fname) {
// couldn't allocate memory?
return nullptr;
}
// now actually grab it
SearchPathW(sanitizedFilePath, fname, L".dll", pathlen + 1, full_fname.get(),
nullptr);
return full_fname;
}
// No builtin function to find the last character matching a set
static wchar_t* lastslash(wchar_t* s, int len) {
for (wchar_t* c = s + len - 1; c >= s; --c) {
if (*c == L'\\' || *c == L'/') {
return c;
}
}
return nullptr;
}
static bool ShouldBlockBasedOnBlockInfo(const DllBlockInfo& info,
const char* dllName, PWCHAR filePath,
wchar_t* fname,
unsigned long long* fVersion) {
#ifdef DEBUG_very_verbose
printf_stderr("LdrLoadDll: info->mName: '%s'\n", info->mName);
#endif
if (info.mFlags & DllBlockInfoFlags::REDIRECT_TO_NOOP_ENTRYPOINT) {
printf_stderr(
"LdrLoadDll: "
"Ignoring the REDIRECT_TO_NOOP_ENTRYPOINT flag\n");
}
if ((info.mFlags & DllBlockInfoFlags::CHILD_PROCESSES_ONLY) &&
!(sInitFlags & eDllBlocklistInitFlagIsChildProcess)) {
return false;
}
if ((info.mFlags & DllBlockInfoFlags::UTILITY_PROCESSES_ONLY) &&
!(sInitFlags & eDllBlocklistInitFlagIsUtilityProcess)) {
return false;
}
if ((info.mFlags & DllBlockInfoFlags::SOCKET_PROCESSES_ONLY) &&
!(sInitFlags & eDllBlocklistInitFlagIsSocketProcess)) {
return false;
}
if ((info.mFlags & DllBlockInfoFlags::GPU_PROCESSES_ONLY) &&
!(sInitFlags & eDllBlocklistInitFlagIsGPUProcess)) {
return false;
}
if ((info.mFlags & DllBlockInfoFlags::BROWSER_PROCESS_ONLY) &&
(sInitFlags & eDllBlocklistInitFlagIsChildProcess)) {
return false;
}
if ((info.mFlags & DllBlockInfoFlags::GMPLUGIN_PROCESSES_ONLY) &&
!(sInitFlags & eDllBlocklistInitFlagIsGMPluginProcess)) {
return false;
}
*fVersion = DllBlockInfo::ALL_VERSIONS;
if (info.mMaxVersion != DllBlockInfo::ALL_VERSIONS) {
ReentrancySentinel sentinel(dllName);
if (sentinel.BailOut()) {
return false;
}
UniquePtr<wchar_t[]> full_fname = getFullPath(filePath, fname);
if (!full_fname) {
// uh, we couldn't find the DLL at all, so...
printf_stderr(
"LdrLoadDll: Blocking load of '%s' (SearchPathW didn't find "
"it?)\n",
dllName);
return true;
}
if (info.mFlags & DllBlockInfoFlags::USE_TIMESTAMP) {
*fVersion = GetTimestamp(full_fname.get());
if (*fVersion > info.mMaxVersion) {
return false;
}
} else {
LauncherResult<ModuleVersion> version =
GetModuleVersion(full_fname.get());
// If we failed to get the version information, we block.
if (version.isOk()) {
return info.IsVersionBlocked(version.unwrap());
}
}
}
// Falling through to here means we should block.
return true;
}
struct CaseSensitiveStringComparator {
explicit CaseSensitiveStringComparator(const char* aTarget)
: mTarget(aTarget) {}
int operator()(const DllBlockInfo& aVal) const {
return strcmp(mTarget, aVal.mName);
}
const char* mTarget;
};
static NTSTATUS NTAPI patched_LdrLoadDll(PWCHAR filePath, PULONG flags,
PUNICODE_STRING moduleFileName,
PHANDLE handle) {
// We have UCS2 (UTF16?), we want ASCII, but we also just want the filename
// portion
#define DLLNAME_MAX 128
char dllName[DLLNAME_MAX + 1];
wchar_t* dll_part;
char* dot;
int len = moduleFileName->Length / 2;
wchar_t* fname = moduleFileName->Buffer;
// The filename isn't guaranteed to be null terminated, but in practice
// it always will be; ensure that this is so, and bail if not.
// where lots of weird things were happening when we tried to make a copy.
if (moduleFileName->MaximumLength < moduleFileName->Length + 2 ||
fname[len] != 0) {
#ifdef DEBUG
printf_stderr("LdrLoadDll: non-null terminated string found!\n");
#endif
goto continue_loading;
}
dll_part = lastslash(fname, len);
if (dll_part) {
dll_part = dll_part + 1;
len -= dll_part - fname;
} else {
dll_part = fname;
}
#ifdef DEBUG_very_verbose
printf_stderr("LdrLoadDll: dll_part '%S' %d\n", dll_part, len);
#endif
// if it's too long, then, we assume we won't want to block it,
// since DLLNAME_MAX should be at least long enough to hold the longest
// entry in our blocklist.
if (len > DLLNAME_MAX) {
#ifdef DEBUG
printf_stderr("LdrLoadDll: len too long! %d\n", len);
#endif
goto continue_loading;
}
// copy over to our char byte buffer, lowercasing ASCII as we go
for (int i = 0; i < len; i++) {
wchar_t c = dll_part[i];
if (c > 0x7f) {
// welp, it's not ascii; if we need to add non-ascii things to
// our blocklist, we'll have to remove this limitation.
goto continue_loading;
}
// ensure that dll name is all lowercase
if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
dllName[i] = (char)c;
}
dllName[len] = 0;
#ifdef DEBUG_very_verbose
printf_stderr("LdrLoadDll: dll name '%s'\n", dllName);
#endif
if (!(sInitFlags & eDllBlocklistInitFlagWasBootstrapped)) {
// Block a suspicious binary that uses various 12-digit hex strings
dot = strchr(dllName, '.');
if (dot && (strchr(dot + 1, '.') == dot + 13)) {
char* end = nullptr;
_strtoui64(dot + 1, &end, 16);
if (end == dot + 13) {
return STATUS_DLL_NOT_FOUND;
}
}
// Block binaries where the filename is at least 16 hex digits
if (dot && ((dot - dllName) >= 16)) {
char* current = dllName;
while (current < dot && isxdigit(*current)) {
current++;
}
if (current == dot) {
return STATUS_DLL_NOT_FOUND;
}
}
// then compare to everything on the blocklist
DECLARE_POINTER_TO_FIRST_DLL_BLOCKLIST_ENTRY(info);
DECLARE_DLL_BLOCKLIST_NUM_ENTRIES(infoNumEntries);
CaseSensitiveStringComparator comp(dllName);
size_t match = LowerBound(info, 0, infoNumEntries, comp);
if (match != infoNumEntries) {
// There may be multiple entries on the list. Since LowerBound() returns
// the first entry that matches (if there are any matches),
// search forward from there.
while (match < infoNumEntries && (comp(info[match]) == 0)) {
unsigned long long fVersion;
if (ShouldBlockBasedOnBlockInfo(info[match], dllName, filePath, fname,
&fVersion)) {
printf_stderr(
"LdrLoadDll: Blocking load of '%s' -- see "
dllName);
DllBlockSet::Add(info[match].mName, fVersion);
return STATUS_DLL_NOT_FOUND;
}
++match;
}
}
}
continue_loading:
#ifdef DEBUG_very_verbose
printf_stderr("LdrLoadDll: continuing load... ('%S')\n",
moduleFileName->Buffer);
#endif
glue::ModuleLoadFrame loadFrame(moduleFileName);
NTSTATUS ret;
HANDLE myHandle;
ret = stub_LdrLoadDll(filePath, flags, moduleFileName, &myHandle);
if (handle) {
*handle = myHandle;
}
loadFrame.SetLoadStatus(ret, myHandle);
return ret;
}
#if defined(BLOCK_LOADLIBRARY_INJECTION)
// Map of specific thread proc addresses we should block. In particular,
// LoadLibrary* APIs which indicate DLL injection
static void* gStartAddressesToBlock[4];
#endif // defined(BLOCK_LOADLIBRARY_INJECTION)
static bool ShouldBlockThread(void* aStartAddress) {
// Allows crashfirefox.exe to continue to work. Also if your threadproc is
// null, this crash is intentional.
if (aStartAddress == nullptr) {
return false;
}
#if defined(BLOCK_LOADLIBRARY_INJECTION)
for (auto p : gStartAddressesToBlock) {
if (p == aStartAddress) {
return true;
}
}
#endif
bool shouldBlock = false;
MEMORY_BASIC_INFORMATION startAddressInfo = {0};
if (VirtualQuery(aStartAddress, &startAddressInfo,
sizeof(startAddressInfo))) {
shouldBlock |= startAddressInfo.State != MEM_COMMIT;
shouldBlock |= startAddressInfo.Protect != PAGE_EXECUTE_READ;
}
return shouldBlock;
}
// Allows blocked threads to still run normally through BaseThreadInitThunk, in
// case there's any magic there that we shouldn't skip.
static DWORD WINAPI NopThreadProc(void* /* aThreadParam */) { return 0; }
static MOZ_NORETURN void __fastcall patched_BaseThreadInitThunk(
BOOL aIsInitialThread, void* aStartAddress, void* aThreadParam) {
if (ShouldBlockThread(aStartAddress)) {
aStartAddress = (void*)NopThreadProc;
}
stub_BaseThreadInitThunk(aIsInitialThread, aStartAddress, aThreadParam);
}
MOZ_RUNINIT static WindowsDllInterceptor NtDllIntercept;
MOZ_RUNINIT static WindowsDllInterceptor Kernel32Intercept;
static void GetNativeNtBlockSetWriter();
static glue::LoaderObserver gMozglueLoaderObserver;
MOZ_RUNINIT static nt::WinLauncherServices gWinLauncher;
MFBT_API void DllBlocklist_Initialize(uint32_t aInitFlags) {
if (sBlocklistInitAttempted) {
return;
}
sBlocklistInitAttempted = true;
sInitFlags = aInitFlags;
glue::ModuleLoadFrame::StaticInit(&gMozglueLoaderObserver, &gWinLauncher);
// Workaround: If we detect WRusr.dll, don't hook.
if (!GetModuleHandleW(L"WRusr.dll")) {
Kernel32Intercept.Init(L"kernel32.dll");
if (!stub_BaseThreadInitThunk.SetDetour(Kernel32Intercept,
"BaseThreadInitThunk",
&patched_BaseThreadInitThunk)) {
#ifdef DEBUG
printf_stderr("BaseThreadInitThunk hook failed\n");
#endif
}
}
#if defined(BLOCK_LOADLIBRARY_INJECTION)
// Populate a list of thread start addresses to block.
HMODULE hKernel = GetModuleHandleW(L"kernel32.dll");
if (hKernel) {
void* pProc;
pProc = (void*)GetProcAddress(hKernel, "LoadLibraryA");
gStartAddressesToBlock[0] = pProc;
pProc = (void*)GetProcAddress(hKernel, "LoadLibraryW");
gStartAddressesToBlock[1] = pProc;
pProc = (void*)GetProcAddress(hKernel, "LoadLibraryExA");
gStartAddressesToBlock[2] = pProc;
pProc = (void*)GetProcAddress(hKernel, "LoadLibraryExW");
gStartAddressesToBlock[3] = pProc;
}
#endif
if (aInitFlags & eDllBlocklistInitFlagWasBootstrapped) {
GetNativeNtBlockSetWriter();
return;
}
// There are a couple of exceptional cases where we skip user32.dll check.
// - If the the process was bootstrapped by the launcher process, AppInit
// DLLs will be intercepted by the new DllBlockList. No need to check
// here.
// - The code to initialize the base profiler loads winmm.dll which
// statically links user32.dll on an older Windows. This means if the base
// profiler is active before coming here, we cannot fully intercept AppInit
// DLLs. Given that the base profiler is used outside the typical use
// cases, it's ok not to check user32.dll in this scenario.
const bool skipUser32Check =
(sInitFlags & eDllBlocklistInitFlagWasBootstrapped) ||
(!IsWin10AnniversaryUpdateOrLater() &&
baseprofiler::profiler_is_active());
// In order to be effective against AppInit DLLs, the blocklist must be
if (!skipUser32Check && GetModuleHandleW(L"user32.dll")) {
sUser32BeforeBlocklist = true;
#ifdef DEBUG
printf_stderr("DLL blocklist was unable to intercept AppInit DLLs.\n");
#endif
}
NtDllIntercept.Init("ntdll.dll");
ReentrancySentinel::InitializeStatics();
// We specifically use a detour, because there are cases where external
// code also tries to hook LdrLoadDll, and doesn't know how to relocate our
bool ok = stub_LdrLoadDll.SetDetour(NtDllIntercept, "LdrLoadDll",
&patched_LdrLoadDll);
if (!ok) {
sBlocklistInitFailed = true;
#ifdef DEBUG
printf_stderr("LdrLoadDll hook failed, no dll blocklisting active\n");
#endif
}
// If someone injects a thread early that causes user32.dll to load off the
// main thread this causes issues, so load it as soon as we've initialized
if (!sUser32BeforeBlocklist && !IsWin32kLockedDown()) {
::LoadLibraryW(L"user32.dll");
}
}
#ifdef DEBUG
MFBT_API void DllBlocklist_Shutdown() {}
#endif // DEBUG
static void InternalWriteNotes(WritableBuffer& aBuffer) {
DllBlockSet::Write(aBuffer);
}
using WriterFn = void (*)(WritableBuffer& aBuffer);
static WriterFn gWriterFn = &InternalWriteNotes;
static void GetNativeNtBlockSetWriter() {
auto nativeWriter = reinterpret_cast<WriterFn>(
::GetProcAddress(::GetModuleHandleW(nullptr), "NativeNtBlockSet_Write"));
if (nativeWriter) {
gWriterFn = nativeWriter;
}
}
MFBT_API void DllBlocklist_WriteNotes() { gWriterFn(sBlocklistWriter); }
MFBT_API bool DllBlocklist_CheckStatus() {
if (sBlocklistInitFailed || sUser32BeforeBlocklist) return false;
return true;
}
MFBT_API bool* DllBlocklist_GetBlocklistInitFailedPointer() {
return &sBlocklistInitFailed;
}
MFBT_API bool* DllBlocklist_GetUser32BeforeBlocklistPointer() {
return &sUser32BeforeBlocklist;
}
MFBT_API const char* DllBlocklist_GetBlocklistWriterData() {
return sBlocklistWriter.Data();
}
// ============================================================================
// This section is for DLL Services
// ============================================================================
namespace mozilla {
Authenticode* GetAuthenticode();
} // namespace mozilla
/**
* Please note that DllBlocklist_SetFullDllServices is called with
* aSvc = nullptr to de-initialize the resources even though they
* have been initialized via DllBlocklist_SetBasicDllServices.
*/
MFBT_API void DllBlocklist_SetFullDllServices(
mozilla::glue::detail::DllServicesBase* aSvc) {
glue::AutoExclusiveLock lock(gDllServicesLock);
if (aSvc) {
aSvc->SetAuthenticodeImpl(GetAuthenticode());
aSvc->SetWinLauncherServices(gWinLauncher);
gMozglueLoaderObserver.Forward(aSvc);
}
gDllServices = aSvc;
}
MFBT_API void DllBlocklist_SetBasicDllServices(
mozilla::glue::detail::DllServicesBase* aSvc) {
if (!aSvc) {
return;
}
aSvc->SetAuthenticodeImpl(GetAuthenticode());
gMozglueLoaderObserver.Disable();
}