зеркало из https://github.com/mozilla/gecko-dev.git
466 строки
14 KiB
C++
466 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <windows.h>
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#include <winternl.h>
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#include <stdio.h>
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#include <string.h>
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#include <map>
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#include "nsXULAppAPI.h"
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#include "nsAutoPtr.h"
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#include "nsThreadUtils.h"
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#include "prlog.h"
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#include "nsWindowsDllInterceptor.h"
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using namespace mozilla;
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#if defined(MOZ_CRASHREPORTER) && !defined(NO_BLOCKLIST_CRASHREPORTER)
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#include "nsExceptionHandler.h"
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#endif
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#define ALL_VERSIONS ((unsigned long long)-1LL)
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// DLLs sometimes ship without a version number, particularly early
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// releases. Blocking "version <= 0" has the effect of blocking unversioned
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// DLLs (since the call to get version info fails), but not blocking
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// any versioned instance.
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#define UNVERSIONED ((unsigned long long)0LL)
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// Convert the 4 (decimal) components of a DLL version number into a
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// single unsigned long long, as needed by the blocklist
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#define MAKE_VERSION(a,b,c,d)\
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((a##ULL << 48) + (b##ULL << 32) + (c##ULL << 16) + d##ULL)
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struct DllBlockInfo {
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// The name of the DLL -- in LOWERCASE! It will be compared to
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// a lowercase version of the DLL name only.
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const char *name;
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// If maxVersion is ALL_VERSIONS, we'll block all versions of this
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// dll. Otherwise, we'll block all versions less than or equal to
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// the given version, as queried by GetFileVersionInfo and
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// VS_FIXEDFILEINFO's dwFileVersionMS and dwFileVersionLS fields.
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//
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// Note that the version is usually 4 components, which is A.B.C.D
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// encoded as 0x AAAA BBBB CCCC DDDD ULL (spaces added for clarity),
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// but it's not required to be of that format.
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unsigned long long maxVersion;
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};
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static DllBlockInfo sWindowsDllBlocklist[] = {
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// EXAMPLE:
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// { "uxtheme.dll", ALL_VERSIONS },
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// { "uxtheme.dll", 0x0000123400000000ULL },
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// The DLL name must be in lowercase!
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// NPFFAddon - Known malware
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{ "npffaddon.dll", ALL_VERSIONS},
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// AVG 8 - Antivirus vendor AVG, old version, plugin already blocklisted
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{"avgrsstx.dll", MAKE_VERSION(8,5,0,401)},
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// calc.dll - Suspected malware
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{"calc.dll", MAKE_VERSION(1,0,0,1)},
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// hook.dll - Suspected malware
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{"hook.dll", ALL_VERSIONS},
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// GoogleDesktopNetwork3.dll - Extremely old, unversioned instances
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// of this DLL cause crashes
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{"googledesktopnetwork3.dll", UNVERSIONED},
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// rdolib.dll - Suspected malware
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{"rdolib.dll", MAKE_VERSION(6,0,88,4)},
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// fgjk4wvb.dll - Suspected malware
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{"fgjk4wvb.dll", MAKE_VERSION(8,8,8,8)},
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// radhslib.dll - Naomi internet filter - unmaintained since 2006
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{"radhslib.dll", UNVERSIONED},
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// Music download filter for vkontakte.ru - old instances
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// of this DLL cause crashes
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{"vksaver.dll", MAKE_VERSION(2,2,2,0)},
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// Topcrash in Firefox 4.0b1
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{"rlxf.dll", MAKE_VERSION(1,2,323,1)},
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// psicon.dll - Topcrashes in Thunderbird, and some crashes in Firefox
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// Adobe photoshop library, now redundant in later installations
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{"psicon.dll", ALL_VERSIONS},
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// Topcrash in Firefox 4 betas (bug 618899)
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{"accelerator.dll", MAKE_VERSION(3,2,1,6)},
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// Topcrash with Roboform in Firefox 8 (bug 699134)
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{"rf-firefox.dll", MAKE_VERSION(7,6,1,0)},
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{"roboform.dll", MAKE_VERSION(7,6,1,0)},
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// leave these two in always for tests
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{ "mozdllblockingtest.dll", ALL_VERSIONS },
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{ "mozdllblockingtest_versioned.dll", 0x0000000400000000ULL },
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{ NULL, 0 }
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};
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#ifndef STATUS_DLL_NOT_FOUND
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#define STATUS_DLL_NOT_FOUND ((DWORD)0xC0000135L)
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#endif
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// define this for very verbose dll load debug spew
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#undef DEBUG_very_verbose
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extern bool gInXPCOMLoadOnMainThread;
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namespace {
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typedef NTSTATUS (NTAPI *LdrLoadDll_func) (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileName, PHANDLE handle);
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static LdrLoadDll_func stub_LdrLoadDll = 0;
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template <class T>
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struct RVAMap {
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RVAMap(HANDLE map, DWORD offset) {
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SYSTEM_INFO info;
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GetSystemInfo(&info);
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DWORD alignedOffset = (offset / info.dwAllocationGranularity) *
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info.dwAllocationGranularity;
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NS_ASSERTION(offset - alignedOffset < info.dwAllocationGranularity, "Wtf");
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mRealView = ::MapViewOfFile(map, FILE_MAP_READ, 0, alignedOffset,
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sizeof(T) + (offset - alignedOffset));
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mMappedView = mRealView ? reinterpret_cast<T*>((char*)mRealView + (offset - alignedOffset)) :
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nsnull;
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}
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~RVAMap() {
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if (mRealView) {
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::UnmapViewOfFile(mRealView);
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}
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}
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operator const T*() const { return mMappedView; }
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const T* operator->() const { return mMappedView; }
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private:
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const T* mMappedView;
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void* mRealView;
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};
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bool
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IsVistaOrLater()
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{
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OSVERSIONINFO info;
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ZeroMemory(&info, sizeof(OSVERSIONINFO));
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info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
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GetVersionEx(&info);
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return info.dwMajorVersion >= 6;
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}
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bool
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CheckASLR(const wchar_t* path)
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{
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bool retval = false;
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HANDLE file = ::CreateFileW(path, GENERIC_READ, FILE_SHARE_READ,
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NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
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NULL);
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if (file != INVALID_HANDLE_VALUE) {
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HANDLE map = ::CreateFileMappingW(file, NULL, PAGE_READONLY, 0, 0, NULL);
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if (map) {
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RVAMap<IMAGE_DOS_HEADER> peHeader(map, 0);
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if (peHeader) {
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RVAMap<IMAGE_NT_HEADERS> ntHeader(map, peHeader->e_lfanew);
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if (ntHeader) {
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// If the DLL has no code, permit it regardless of ASLR status.
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if (ntHeader->OptionalHeader.SizeOfCode == 0) {
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retval = true;
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}
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// Check to see if the DLL supports ASLR
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else if ((ntHeader->OptionalHeader.DllCharacteristics &
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IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE) != 0) {
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retval = true;
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}
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}
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}
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::CloseHandle(map);
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}
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::CloseHandle(file);
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}
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return retval;
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}
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/**
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* Some versions of Windows call LoadLibraryEx to get the version information
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* for a DLL, which causes our patched LdrLoadDll implementation to re-enter
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* itself and cause infinite recursion and a stack-exhaustion crash. We protect
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* against reentrancy by allowing recursive loads of the same DLL.
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*
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* Note that we don't use __declspec(thread) because that doesn't work in DLLs
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* loaded via LoadLibrary and there can be a limited number of TLS slots, so
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* we roll our own.
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*/
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class ReentrancySentinel
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{
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public:
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explicit ReentrancySentinel(const char* dllName)
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{
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DWORD currentThreadId = GetCurrentThreadId();
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EnterCriticalSection(&sLock);
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mPreviousDllName = (*sThreadMap)[currentThreadId];
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// If there is a DLL currently being loaded and it has the same name
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// as the current attempt, we're re-entering.
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mReentered = mPreviousDllName && !stricmp(mPreviousDllName, dllName);
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(*sThreadMap)[currentThreadId] = dllName;
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LeaveCriticalSection(&sLock);
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}
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~ReentrancySentinel()
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{
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DWORD currentThreadId = GetCurrentThreadId();
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EnterCriticalSection(&sLock);
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(*sThreadMap)[currentThreadId] = mPreviousDllName;
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LeaveCriticalSection(&sLock);
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}
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bool BailOut() const
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{
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return mReentered;
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};
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static void InitializeStatics()
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{
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InitializeCriticalSection(&sLock);
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sThreadMap = new std::map<DWORD, const char*>;
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}
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private:
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static CRITICAL_SECTION sLock;
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static std::map<DWORD, const char*>* sThreadMap;
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const char* mPreviousDllName;
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bool mReentered;
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};
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CRITICAL_SECTION ReentrancySentinel::sLock;
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std::map<DWORD, const char*>* ReentrancySentinel::sThreadMap;
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static
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wchar_t* getFullPath (PWCHAR filePath, wchar_t* fname)
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{
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// In Windows 8, the first parameter seems to be used for more than just the
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// path name. For example, its numerical value can be 1. Passing a non-valid
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// pointer to SearchPathW will cause a crash, so we need to check to see if we
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// are handed a valid pointer, and otherwise just pass NULL to SearchPathW.
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PWCHAR sanitizedFilePath = (intptr_t(filePath) < 1024) ? NULL : filePath;
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// figure out the length of the string that we need
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DWORD pathlen = SearchPathW(sanitizedFilePath, fname, L".dll", 0, NULL, NULL);
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if (pathlen == 0) {
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return nsnull;
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}
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wchar_t* full_fname = new wchar_t[pathlen+1];
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if (!full_fname) {
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// couldn't allocate memory?
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return nsnull;
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}
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// now actually grab it
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SearchPathW(sanitizedFilePath, fname, L".dll", pathlen+1, full_fname, NULL);
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return full_fname;
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}
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static NTSTATUS NTAPI
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patched_LdrLoadDll (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileName, PHANDLE handle)
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{
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// We have UCS2 (UTF16?), we want ASCII, but we also just want the filename portion
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#define DLLNAME_MAX 128
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char dllName[DLLNAME_MAX+1];
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wchar_t *dll_part;
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DllBlockInfo *info;
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int len = moduleFileName->Length / 2;
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wchar_t *fname = moduleFileName->Buffer;
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nsAutoArrayPtr<wchar_t> full_fname;
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// The filename isn't guaranteed to be null terminated, but in practice
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// it always will be; ensure that this is so, and bail if not.
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// This is done instead of the more robust approach because of bug 527122,
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// where lots of weird things were happening when we tried to make a copy.
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if (moduleFileName->MaximumLength < moduleFileName->Length+2 ||
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fname[len] != 0)
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{
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#ifdef DEBUG
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printf_stderr("LdrLoadDll: non-null terminated string found!\n");
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#endif
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goto continue_loading;
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}
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dll_part = wcsrchr(fname, L'\\');
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if (dll_part) {
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dll_part = dll_part + 1;
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len -= dll_part - fname;
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} else {
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dll_part = fname;
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}
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#ifdef DEBUG_very_verbose
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printf_stderr("LdrLoadDll: dll_part '%S' %d\n", dll_part, len);
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#endif
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// if it's too long, then, we assume we won't want to block it,
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// since DLLNAME_MAX should be at least long enough to hold the longest
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// entry in our blocklist.
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if (len > DLLNAME_MAX) {
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#ifdef DEBUG
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printf_stderr("LdrLoadDll: len too long! %d\n", len);
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#endif
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goto continue_loading;
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}
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// copy over to our char byte buffer, lowercasing ASCII as we go
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for (int i = 0; i < len; i++) {
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wchar_t c = dll_part[i];
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if (c > 0x7f) {
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// welp, it's not ascii; if we need to add non-ascii things to
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// our blocklist, we'll have to remove this limitation.
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goto continue_loading;
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}
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// ensure that dll name is all lowercase
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if (c >= 'A' && c <= 'Z')
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c += 'a' - 'A';
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dllName[i] = (char) c;
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}
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dllName[len] = 0;
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#ifdef DEBUG_very_verbose
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printf_stderr("LdrLoadDll: dll name '%s'\n", dllName);
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#endif
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// then compare to everything on the blocklist
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info = &sWindowsDllBlocklist[0];
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while (info->name) {
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if (strcmp(info->name, dllName) == 0)
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break;
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info++;
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}
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if (info->name) {
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bool load_ok = false;
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#ifdef DEBUG_very_verbose
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printf_stderr("LdrLoadDll: info->name: '%s'\n", info->name);
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#endif
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if (info->maxVersion != ALL_VERSIONS) {
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ReentrancySentinel sentinel(dllName);
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if (sentinel.BailOut()) {
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goto continue_loading;
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}
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full_fname = getFullPath(filePath, fname);
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if (!full_fname) {
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// uh, we couldn't find the DLL at all, so...
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printf_stderr("LdrLoadDll: Blocking load of '%s' (SearchPathW didn't find it?)\n", dllName);
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return STATUS_DLL_NOT_FOUND;
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}
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DWORD zero;
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DWORD infoSize = GetFileVersionInfoSizeW(full_fname, &zero);
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// If we failed to get the version information, we block.
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if (infoSize != 0) {
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nsAutoArrayPtr<unsigned char> infoData(new unsigned char[infoSize]);
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VS_FIXEDFILEINFO *vInfo;
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UINT vInfoLen;
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if (GetFileVersionInfoW(full_fname, 0, infoSize, infoData) &&
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VerQueryValueW(infoData, L"\\", (LPVOID*) &vInfo, &vInfoLen))
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{
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unsigned long long fVersion =
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((unsigned long long)vInfo->dwFileVersionMS) << 32 |
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((unsigned long long)vInfo->dwFileVersionLS);
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// finally do the version check, and if it's greater than our block
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// version, keep loading
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if (fVersion > info->maxVersion)
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load_ok = true;
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}
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}
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}
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if (!load_ok) {
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printf_stderr("LdrLoadDll: Blocking load of '%s' -- see http://www.mozilla.com/en-US/blocklist/\n", dllName);
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return STATUS_DLL_NOT_FOUND;
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}
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}
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continue_loading:
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#ifdef DEBUG_very_verbose
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printf_stderr("LdrLoadDll: continuing load... ('%S')\n", moduleFileName->Buffer);
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#endif
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NS_SetHasLoadedNewDLLs();
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if (gInXPCOMLoadOnMainThread && NS_IsMainThread()) {
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// Check to ensure that the DLL has ASLR.
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full_fname = getFullPath(filePath, fname);
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if (!full_fname) {
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// uh, we couldn't find the DLL at all, so...
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printf_stderr("LdrLoadDll: Blocking load of '%s' (SearchPathW didn't find it?)\n", dllName);
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return STATUS_DLL_NOT_FOUND;
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}
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if (IsVistaOrLater() && !CheckASLR(full_fname)) {
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printf_stderr("LdrLoadDll: Blocking load of '%s'. XPCOM components must support ASLR.\n", dllName);
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return STATUS_DLL_NOT_FOUND;
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}
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}
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return stub_LdrLoadDll(filePath, flags, moduleFileName, handle);
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}
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WindowsDllInterceptor NtDllIntercept;
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} // anonymous namespace
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void
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XRE_SetupDllBlocklist()
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{
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NtDllIntercept.Init("ntdll.dll");
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ReentrancySentinel::InitializeStatics();
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bool ok = NtDllIntercept.AddHook("LdrLoadDll", reinterpret_cast<intptr_t>(patched_LdrLoadDll), (void**) &stub_LdrLoadDll);
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#ifdef DEBUG
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if (!ok)
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printf_stderr ("LdrLoadDll hook failed, no dll blocklisting active\n");
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#endif
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#if defined(MOZ_CRASHREPORTER) && !defined(NO_BLOCKLIST_CRASHREPORTER)
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if (!ok) {
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CrashReporter::AppendAppNotesToCrashReport(NS_LITERAL_CSTRING("DllBlockList Failed\n"));
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}
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#endif
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}
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