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gecko-dev/mozglue/build/WindowsDllBlocklist.cpp

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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <windows.h>
#include <winternl.h>
#include <io.h>
#pragma warning( push )
#pragma warning( disable : 4275 4530 ) // See msvc-stl-wrapper.template.h
#include <map>
#pragma warning( pop )
#define MOZ_NO_MOZALLOC
#include "nsAutoPtr.h"
#include "nsWindowsDllInterceptor.h"
#include "mozilla/WindowsVersion.h"
#include "nsWindowsHelpers.h"
using namespace mozilla;
#define ALL_VERSIONS ((unsigned long long)-1LL)
// DLLs sometimes ship without a version number, particularly early
// releases. Blocking "version <= 0" has the effect of blocking unversioned
// DLLs (since the call to get version info fails), but not blocking
// any versioned instance.
#define UNVERSIONED ((unsigned long long)0LL)
// Convert the 4 (decimal) components of a DLL version number into a
// single unsigned long long, as needed by the blocklist
#define MAKE_VERSION(a,b,c,d)\
((a##ULL << 48) + (b##ULL << 32) + (c##ULL << 16) + d##ULL)
struct DllBlockInfo {
// The name of the DLL -- in LOWERCASE! It will be compared to
// a lowercase version of the DLL name only.
const char *name;
// If maxVersion is ALL_VERSIONS, we'll block all versions of this
// dll. Otherwise, we'll block all versions less than or equal to
// the given version, as queried by GetFileVersionInfo and
// VS_FIXEDFILEINFO's dwFileVersionMS and dwFileVersionLS fields.
//
// Note that the version is usually 4 components, which is A.B.C.D
// encoded as 0x AAAA BBBB CCCC DDDD ULL (spaces added for clarity),
// but it's not required to be of that format.
//
// If the USE_TIMESTAMP flag is set, then we use the timestamp from
// the IMAGE_FILE_HEADER in lieu of a version number.
unsigned long long maxVersion;
enum {
FLAGS_DEFAULT = 0,
BLOCK_WIN8PLUS_ONLY = 1,
BLOCK_XP_ONLY = 2,
USE_TIMESTAMP = 4,
} flags;
};
static DllBlockInfo sWindowsDllBlocklist[] = {
// EXAMPLE:
// { "uxtheme.dll", ALL_VERSIONS },
// { "uxtheme.dll", 0x0000123400000000ULL },
// The DLL name must be in lowercase!
// NPFFAddon - Known malware
{ "npffaddon.dll", ALL_VERSIONS},
// AVG 8 - Antivirus vendor AVG, old version, plugin already blocklisted
{"avgrsstx.dll", MAKE_VERSION(8,5,0,401)},
// calc.dll - Suspected malware
{"calc.dll", MAKE_VERSION(1,0,0,1)},
// hook.dll - Suspected malware
{"hook.dll", ALL_VERSIONS},
// GoogleDesktopNetwork3.dll - Extremely old, unversioned instances
// of this DLL cause crashes
{"googledesktopnetwork3.dll", UNVERSIONED},
// rdolib.dll - Suspected malware
{"rdolib.dll", MAKE_VERSION(6,0,88,4)},
// fgjk4wvb.dll - Suspected malware
{"fgjk4wvb.dll", MAKE_VERSION(8,8,8,8)},
// radhslib.dll - Naomi internet filter - unmaintained since 2006
{"radhslib.dll", UNVERSIONED},
// Music download filter for vkontakte.ru - old instances
// of this DLL cause crashes
{"vksaver.dll", MAKE_VERSION(2,2,2,0)},
// Topcrash in Firefox 4.0b1
{"rlxf.dll", MAKE_VERSION(1,2,323,1)},
// psicon.dll - Topcrashes in Thunderbird, and some crashes in Firefox
// Adobe photoshop library, now redundant in later installations
{"psicon.dll", ALL_VERSIONS},
// Topcrash in Firefox 4 betas (bug 618899)
{"accelerator.dll", MAKE_VERSION(3,2,1,6)},
// Topcrash with Roboform in Firefox 8 (bug 699134)
{"rf-firefox.dll", MAKE_VERSION(7,6,1,0)},
{"roboform.dll", MAKE_VERSION(7,6,1,0)},
// Topcrash with Babylon Toolbar on FF16+ (bug 721264)
{"babyfox.dll", ALL_VERSIONS},
// sprotector.dll crashes, bug 957258
{"sprotector.dll", ALL_VERSIONS},
// Topcrash with Websense Endpoint, bug 828184
{"qipcap.dll", MAKE_VERSION(7, 6, 815, 1)},
// leave these two in always for tests
{ "mozdllblockingtest.dll", ALL_VERSIONS },
{ "mozdllblockingtest_versioned.dll", 0x0000000400000000ULL },
// Windows Media Foundation FLAC decoder and type sniffer (bug 839031).
{ "mfflac.dll", ALL_VERSIONS },
// Older Relevant Knowledge DLLs cause us to crash (bug 904001).
{ "rlnx.dll", MAKE_VERSION(1, 3, 334, 9) },
{ "pmnx.dll", MAKE_VERSION(1, 3, 334, 9) },
{ "opnx.dll", MAKE_VERSION(1, 3, 334, 9) },
{ "prnx.dll", MAKE_VERSION(1, 3, 334, 9) },
// Older belgian ID card software causes Firefox to crash or hang on
// shutdown, bug 831285 and 918399.
{ "beid35cardlayer.dll", MAKE_VERSION(3, 5, 6, 6968) },
// bug 925459, bitguard crashes
{ "bitguard.dll", ALL_VERSIONS },
// bug 812683 - crashes in Windows library when Asus Gamer OSD is installed
// Software is discontinued/unsupported
{ "atkdx11disp.dll", ALL_VERSIONS },
// Topcrash with Conduit SearchProtect, bug 944542
{ "spvc32.dll", ALL_VERSIONS },
// XP topcrash with F-Secure, bug 970362
{ "fs_ccf_ni_umh32.dll", MAKE_VERSION(1, 42, 101, 0), DllBlockInfo::BLOCK_XP_ONLY },
// Topcrash with V-bates, bug 1002748 and bug 1023239
{ "libinject.dll", UNVERSIONED },
{ "libinject2.dll", 0x537DDC93, DllBlockInfo::USE_TIMESTAMP },
{ "libredir2.dll", 0x5385B7ED, DllBlockInfo::USE_TIMESTAMP },
// Crashes with RoboForm2Go written against old SDK, bug 988311
{ "rf-firefox-22.dll", ALL_VERSIONS },
// Crashes with DesktopTemperature, bug 1046382
{ "dtwxsvc.dll", 0x53153234, DllBlockInfo::USE_TIMESTAMP },
{ nullptr, 0 }
};
#ifndef STATUS_DLL_NOT_FOUND
#define STATUS_DLL_NOT_FOUND ((DWORD)0xC0000135L)
#endif
// define this for very verbose dll load debug spew
#undef DEBUG_very_verbose
static const char kBlockedDllsParameter[] = "BlockedDllList=";
static const int kBlockedDllsParameterLen =
sizeof(kBlockedDllsParameter) - 1;
static const char kBlocklistInitFailedParameter[] = "BlocklistInitFailed=1\n";
static const int kBlocklistInitFailedParameterLen =
sizeof(kBlocklistInitFailedParameter) - 1;
static const char kUser32BeforeBlocklistParameter[] = "User32BeforeBlocklist=1\n";
static const int kUser32BeforeBlocklistParameterLen =
sizeof(kUser32BeforeBlocklistParameter) - 1;
static DWORD sThreadLoadingXPCOMModule;
static bool sBlocklistInitFailed;
static bool sUser32BeforeBlocklist;
// Duplicated from xpcom glue. Ideally this should be shared.
void
printf_stderr(const char *fmt, ...)
{
if (IsDebuggerPresent()) {
char buf[2048];
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof(buf), fmt, args);
buf[sizeof(buf) - 1] = '\0';
va_end(args);
OutputDebugStringA(buf);
}
FILE *fp = _fdopen(_dup(2), "a");
if (!fp)
return;
va_list args;
va_start(args, fmt);
vfprintf(fp, fmt, args);
va_end(args);
fclose(fp);
}
namespace {
typedef NTSTATUS (NTAPI *LdrLoadDll_func) (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileName, PHANDLE handle);
static LdrLoadDll_func stub_LdrLoadDll = 0;
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;
};
bool
CheckASLR(const wchar_t* path)
{
bool retval = false;
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) {
// If the DLL has no code, permit it regardless of ASLR status.
if (ntHeader->OptionalHeader.SizeOfCode == 0) {
retval = true;
}
// Check to see if the DLL supports ASLR
else if ((ntHeader->OptionalHeader.DllCharacteristics &
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE) != 0) {
retval = true;
}
}
}
::CloseHandle(map);
}
::CloseHandle(file);
}
return retval;
}
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 file HANDLE. This method is run after
// a crash occurs and must therefore not use the heap, etc.
static void Write(HANDLE file);
private:
DllBlockSet(const char* name, unsigned long long version)
: mName(name)
, mVersion(version)
, mNext(nullptr)
{
}
const char* mName; // points into the sWindowsDllBlocklist 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(HANDLE file)
{
AutoCriticalSection lock(&sLock);
DWORD nBytes;
// 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];
WriteFile(file, b->mName, strlen(b->mName), &nBytes, nullptr);
if (b->mVersion != -1) {
WriteFile(file, ",", 1, &nBytes, nullptr);
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(parts[p], buf, 10);
WriteFile(file, buf, strlen(buf), &nBytes, nullptr);
if (p != 3) {
WriteFile(file, ".", 1, &nBytes, nullptr);
}
}
}
WriteFile(file, ";", 1, &nBytes, nullptr);
}
}
MOZ_SEH_EXCEPT (EXCEPTION_EXECUTE_HANDLER) { }
}
static
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 = (intptr_t(filePath) < 1024) ? nullptr : 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;
}
wchar_t* full_fname = new 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,
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 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;
DllBlockInfo *info;
int len = moduleFileName->Length / 2;
wchar_t *fname = moduleFileName->Buffer;
nsAutoArrayPtr<wchar_t> full_fname;
// 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.
// This is done instead of the more robust approach because of bug 527122,
// 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
// Block a suspicious binary that uses various 12-digit hex strings
// e.g. MovieMode.48CA2AEFA22D.dll (bug 973138)
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;
}
}
// then compare to everything on the blocklist
info = &sWindowsDllBlocklist[0];
while (info->name) {
if (strcmp(info->name, dllName) == 0)
break;
info++;
}
if (info->name) {
bool load_ok = false;
#ifdef DEBUG_very_verbose
printf_stderr("LdrLoadDll: info->name: '%s'\n", info->name);
#endif
if ((info->flags == DllBlockInfo::BLOCK_WIN8PLUS_ONLY) &&
!IsWin8OrLater()) {
goto continue_loading;
}
if ((info->flags == DllBlockInfo::BLOCK_XP_ONLY) &&
IsWin2003OrLater()) {
goto continue_loading;
}
unsigned long long fVersion = ALL_VERSIONS;
if (info->maxVersion != ALL_VERSIONS) {
ReentrancySentinel sentinel(dllName);
if (sentinel.BailOut()) {
goto continue_loading;
}
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 STATUS_DLL_NOT_FOUND;
}
if (info->flags & DllBlockInfo::USE_TIMESTAMP) {
fVersion = GetTimestamp(full_fname);
if (fVersion > info->maxVersion) {
load_ok = true;
}
} else {
DWORD zero;
DWORD infoSize = GetFileVersionInfoSizeW(full_fname, &zero);
// If we failed to get the version information, we block.
if (infoSize != 0) {
nsAutoArrayPtr<unsigned char> infoData(new unsigned char[infoSize]);
VS_FIXEDFILEINFO *vInfo;
UINT vInfoLen;
if (GetFileVersionInfoW(full_fname, 0, infoSize, infoData) &&
VerQueryValueW(infoData, L"\\", (LPVOID*) &vInfo, &vInfoLen))
{
fVersion =
((unsigned long long)vInfo->dwFileVersionMS) << 32 |
((unsigned long long)vInfo->dwFileVersionLS);
// finally do the version check, and if it's greater than our block
// version, keep loading
if (fVersion > info->maxVersion)
load_ok = true;
}
}
}
}
if (!load_ok) {
printf_stderr("LdrLoadDll: Blocking load of '%s' -- see http://www.mozilla.com/en-US/blocklist/\n", dllName);
DllBlockSet::Add(info->name, fVersion);
return STATUS_DLL_NOT_FOUND;
}
}
continue_loading:
#ifdef DEBUG_very_verbose
printf_stderr("LdrLoadDll: continuing load... ('%S')\n", moduleFileName->Buffer);
#endif
if (GetCurrentThreadId() == sThreadLoadingXPCOMModule) {
// Check to ensure that the DLL has ASLR.
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 STATUS_DLL_NOT_FOUND;
}
if (IsVistaOrLater() && !CheckASLR(full_fname)) {
printf_stderr("LdrLoadDll: Blocking load of '%s'. XPCOM components must support ASLR.\n", dllName);
return STATUS_DLL_NOT_FOUND;
}
}
return stub_LdrLoadDll(filePath, flags, moduleFileName, handle);
}
WindowsDllInterceptor NtDllIntercept;
} // anonymous namespace
NS_EXPORT void
DllBlocklist_Initialize()
{
if (GetModuleHandleA("user32.dll")) {
sUser32BeforeBlocklist = true;
}
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
// nop space patches. (Bug 951827)
bool ok = NtDllIntercept.AddDetour("LdrLoadDll", reinterpret_cast<intptr_t>(patched_LdrLoadDll), (void**) &stub_LdrLoadDll);
if (!ok) {
sBlocklistInitFailed = true;
#ifdef DEBUG
printf_stderr ("LdrLoadDll hook failed, no dll blocklisting active\n");
#endif
}
}
NS_EXPORT void
DllBlocklist_SetInXPCOMLoadOnMainThread(bool inXPCOMLoadOnMainThread)
{
if (inXPCOMLoadOnMainThread) {
MOZ_ASSERT(sThreadLoadingXPCOMModule == 0, "Only one thread should be doing this");
sThreadLoadingXPCOMModule = GetCurrentThreadId();
} else {
sThreadLoadingXPCOMModule = 0;
}
}
NS_EXPORT void
DllBlocklist_WriteNotes(HANDLE file)
{
DWORD nBytes;
WriteFile(file, kBlockedDllsParameter, kBlockedDllsParameterLen, &nBytes, nullptr);
DllBlockSet::Write(file);
WriteFile(file, "\n", 1, &nBytes, nullptr);
if (sBlocklistInitFailed) {
WriteFile(file, kBlocklistInitFailedParameter,
kBlocklistInitFailedParameterLen, &nBytes, nullptr);
}
if (sUser32BeforeBlocklist) {
WriteFile(file, kUser32BeforeBlocklistParameter,
kUser32BeforeBlocklistParameterLen, &nBytes, nullptr);
}
}
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