summaryrefslogtreecommitdiff
path: root/mozglue/build/WindowsDllBlocklist.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'mozglue/build/WindowsDllBlocklist.cpp')
-rw-r--r--mozglue/build/WindowsDllBlocklist.cpp831
1 files changed, 831 insertions, 0 deletions
diff --git a/mozglue/build/WindowsDllBlocklist.cpp b/mozglue/build/WindowsDllBlocklist.cpp
new file mode 100644
index 0000000000..a3c6627233
--- /dev/null
+++ b/mozglue/build/WindowsDllBlocklist.cpp
@@ -0,0 +1,831 @@
+/* -*- 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/. */
+
+#ifdef MOZ_MEMORY
+#define MOZ_MEMORY_IMPL
+#include "mozmemory_wrap.h"
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+// See mozmemory_wrap.h for more details. This file is part of libmozglue, so
+// it needs to use _impl suffixes.
+#define MALLOC_DECL(name, return_type, ...) \
+ extern "C" MOZ_MEMORY_API return_type name ## _impl(__VA_ARGS__);
+#include "malloc_decls.h"
+#endif
+
+#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 )
+
+#include "nsAutoPtr.h"
+
+#include "nsWindowsDllInterceptor.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WindowsVersion.h"
+#include "nsWindowsHelpers.h"
+#include "WindowsDllBlocklist.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!
+ // The version field is a maximum, that is, we block anything that is
+ // less-than or equal to that version.
+
+ // 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},
+
+ // 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 988311/1196859
+ { "rf-firefox-22.dll", ALL_VERSIONS },
+ { "rf-firefox-40.dll", ALL_VERSIONS },
+
+ // Crashes with DesktopTemperature, bug 1046382
+ { "dtwxsvc.dll", 0x53153234, DllBlockInfo::USE_TIMESTAMP },
+
+ // Startup crashes with Lenovo Onekey Theater, bug 1123778
+ { "activedetect32.dll", UNVERSIONED },
+ { "activedetect64.dll", UNVERSIONED },
+ { "windowsapihookdll32.dll", UNVERSIONED },
+ { "windowsapihookdll64.dll", UNVERSIONED },
+
+ // Flash crashes with RealNetworks RealDownloader, bug 1132663
+ { "rndlnpshimswf.dll", ALL_VERSIONS },
+ { "rndlmainbrowserrecordplugin.dll", ALL_VERSIONS },
+
+ // Startup crashes with RealNetworks Browser Record Plugin, bug 1170141
+ { "nprpffbrowserrecordext.dll", ALL_VERSIONS },
+ { "nprndlffbrowserrecordext.dll", ALL_VERSIONS },
+
+ // Crashes with CyberLink YouCam, bug 1136968
+ { "ycwebcamerasource.ax", MAKE_VERSION(2, 0, 0, 1611) },
+
+ // Old version of WebcamMax crashes WebRTC, bug 1130061
+ { "vwcsource.ax", MAKE_VERSION(1, 5, 0, 0) },
+
+ // NetOp School, discontinued product, bug 763395
+ { "nlsp.dll", MAKE_VERSION(6, 23, 2012, 19) },
+
+ // Orbit Downloader, bug 1222819
+ { "grabdll.dll", MAKE_VERSION(2, 6, 1, 0) },
+ { "grabkernel.dll", MAKE_VERSION(1, 0, 0, 1) },
+
+ // ESET, bug 1229252
+ { "eoppmonitor.dll", ALL_VERSIONS },
+
+ // SS2OSD, bug 1262348
+ { "ss2osd.dll", ALL_VERSIONS },
+ { "ss2devprops.dll", ALL_VERSIONS },
+
+ // NHASUSSTRIXOSD.DLL, bug 1269244
+ { "nhasusstrixosd.dll", ALL_VERSIONS },
+ { "nhasusstrixdevprops.dll", ALL_VERSIONS },
+
+ // Crashes with PremierOpinion/RelevantKnowledge, bug 1277846
+ { "opls.dll", ALL_VERSIONS },
+ { "opls64.dll", ALL_VERSIONS },
+ { "pmls.dll", ALL_VERSIONS },
+ { "pmls64.dll", ALL_VERSIONS },
+ { "prls.dll", ALL_VERSIONS },
+ { "prls64.dll", ALL_VERSIONS },
+ { "rlls.dll", ALL_VERSIONS },
+ { "rlls64.dll", ALL_VERSIONS },
+
+ // Vorbis DirectShow filters, bug 1239690.
+ { "vorbis.acm", MAKE_VERSION(0, 0, 3, 6) },
+
+ // AhnLab Internet Security, bug 1311969
+ { "nzbrcom.dll", ALL_VERSIONS },
+
+ // K7TotalSecurity, bug 1339083.
+ { "k7pswsen.dll", MAKE_VERSION(15, 2, 2, 95) },
+
+ { 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 sBlocklistInitAttempted;
+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)
+{
+ // 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 {
+ DWORD nBytes;
+ 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) { }
+
+ ::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 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;
+ UniquePtr<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;
+ }
+ }
+ // 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
+ 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.get());
+ if (fVersion > info->maxVersion) {
+ load_ok = true;
+ }
+ } else {
+ DWORD zero;
+ DWORD infoSize = GetFileVersionInfoSizeW(full_fname.get(), &zero);
+
+ // If we failed to get the version information, we block.
+
+ if (infoSize != 0) {
+ auto infoData = MakeUnique<unsigned char[]>(infoSize);
+ VS_FIXEDFILEINFO *vInfo;
+ UINT vInfoLen;
+
+ if (GetFileVersionInfoW(full_fname.get(), 0, infoSize, infoData.get()) &&
+ VerQueryValueW(infoData.get(), 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.get())) {
+ 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;
+
+} // namespace
+
+MFBT_API void
+DllBlocklist_Initialize()
+{
+ if (sBlocklistInitAttempted) {
+ return;
+ }
+ sBlocklistInitAttempted = true;
+
+ 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
+ }
+}
+
+MFBT_API void
+DllBlocklist_SetInXPCOMLoadOnMainThread(bool inXPCOMLoadOnMainThread)
+{
+ if (inXPCOMLoadOnMainThread) {
+ MOZ_ASSERT(sThreadLoadingXPCOMModule == 0, "Only one thread should be doing this");
+ sThreadLoadingXPCOMModule = GetCurrentThreadId();
+ } else {
+ sThreadLoadingXPCOMModule = 0;
+ }
+}
+
+MFBT_API 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);
+ }
+}
+
+MFBT_API bool
+DllBlocklist_CheckStatus()
+{
+ if (sBlocklistInitFailed || sUser32BeforeBlocklist)
+ return false;
+ return true;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-15 23:20:25 +0000