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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome_frame/buggy_bho_handling.h"
#include <algorithm>
#include "base/logging.h"
#include "base/process_util.h"
#include "base/win/scoped_comptr.h"
#include "chrome_frame/exception_barrier.h"
#include "chrome_frame/function_stub.h"
#include "chrome_frame/utils.h"
#include "chrome_frame/vtable_patch_manager.h"
namespace buggy_bho {
base::ThreadLocalPointer<BuggyBhoTls> BuggyBhoTls::s_bad_object_tls_;
struct ModuleAndVersion {
const char* module_name_;
const uint32 major_version_;
const uint32 minor_version_;
};
const ModuleAndVersion kBuggyModules[] = {
{ "askbar.dll", 4, 1 }, // troublemaker: 4.1.0.5.
{ "gbieh.dll", 3, 8 }, // troublemaker: 3.8.14.12
{ "gbiehcef.dll", 3, 8 }, // troublemaker: 3.8.11.23
{ "alot.dll", 2, 5 }, // troublemaker: 2.5.12000.509
{ "ctbr.dll", 5, 1 }, // troublemaker: 5.1.0.95
{ "srchbxex.dll", 1, 2 }, // troublemaker: 1.2.123.0
{ "iedvtool32.dll", 8, 0 }, // troublemaker: 8.0.0.4
{ "mst164.dll", 9, 1 }, // troublemaker: 9.1.3700.1
{ "deposit_ie_com.dll", 0, 1 }, // troublemaker: 0.1.0.72
{ "rpshell32.dll", 6, 0 }, // troublemaker: 6.0.6000.1389
{ "msgsres.dll", 6, 0 }, // troublemaker: 6.0.6000.1389
{ "limewireinttb.dll", 4, 1 }, // troublemaker: 4.1.1.1000
{ "pxsecure.dll", 3, 0 }, // troublemaker: 3.0.5.220
// These BHOs seem to be out of the same buggy BHO factory
{ "tbabso.dll", 4, 5 }, // troublemaker: 4.5.156.0
{ "tbabs0.dll.dll", 4, 5 }, // troublemaker: 4.5.156.0
{ "tbbes0.dll", 4, 5 }, // troublemaker: 4.5.153.0
{ "tbfre0.dll", 4, 5 }, // troublemaker: 4.5.181.1
{ "tbmypl.dll", 4, 5 }, // troublemaker: 4.5.181.3
{ "tbmul1.dll", 4, 5 }, // troublemaker: 4.5.181.1
{ "tbdow1.dll", 4, 5 }, // troublemaker: 4.5.167.0
{ "tbfree.dll", 4, 5 }, // troublemaker: 4.5.178.0
// Viruses?
{ "msgsc2.dll", 0xffff, 0xffff }, // troublemaker: 1.2.3000.1
{ "essclis.dll", 0xffff, 0xffff }, // troublemaker: 4.3.1800.2
{ "snagwb.dll", 0xffff, 0xffff }, // troublemaker: 2.6.0.28
};
bool IsBuggyBho(HMODULE mod) {
DCHECK(mod);
char path[MAX_PATH * 2] = {0};
::GetModuleFileNameA(mod, path, arraysize(path));
const char* file_name = ::PathFindFileNameA(path);
for (size_t i = 0; i < arraysize(kBuggyModules); ++i) {
if (lstrcmpiA(file_name, kBuggyModules[i].module_name_) == 0) {
uint32 version = 0;
GetModuleVersion(mod, &version, NULL);
const ModuleAndVersion& buggy = kBuggyModules[i];
if (HIWORD(version) < buggy.major_version_ ||
(HIWORD(version) == buggy.major_version_ &&
LOWORD(version) <= buggy.minor_version_)) {
return true;
}
}
}
return false;
}
BuggyBhoTls::BuggyBhoTls()
: patched_(false) {
DCHECK(s_bad_object_tls_.Get() == NULL);
s_bad_object_tls_.Set(this);
}
BuggyBhoTls::~BuggyBhoTls() {
DCHECK(BuggyBhoTls::GetInstance() == this);
s_bad_object_tls_.Set(NULL);
}
void BuggyBhoTls::AddBuggyObject(IDispatch* obj) {
bad_objects_.push_back(obj);
}
bool BuggyBhoTls::ShouldSkipInvoke(IDispatch* obj) const {
DCHECK(web_browser2_ != NULL);
if (IsChromeFrameDocument(web_browser2_)) {
return std::find(bad_objects_.begin(), bad_objects_.end(), obj) !=
bad_objects_.end();
}
return false;
}
// static
BuggyBhoTls* BuggyBhoTls::GetInstance() {
BuggyBhoTls* tls_instance = s_bad_object_tls_.Get();
if (!tls_instance) {
tls_instance = new BuggyBhoTls();
DCHECK(s_bad_object_tls_.Get() != NULL);
}
return tls_instance;
}
// static
void BuggyBhoTls::DestroyInstance() {
BuggyBhoTls* tls_instance = s_bad_object_tls_.Get();
if (tls_instance) {
delete tls_instance;
DCHECK(s_bad_object_tls_.Get() == NULL);
}
}
HRESULT BuggyBhoTls::PatchBuggyBHOs(IWebBrowser2* browser) {
if (patched_)
return S_FALSE;
DCHECK(browser);
DCHECK(web_browser2_ == NULL);
base::win::ScopedComPtr<IConnectionPointContainer> cpc;
HRESULT hr = cpc.QueryFrom(browser);
if (SUCCEEDED(hr)) {
const GUID sinks[] = { DIID_DWebBrowserEvents2, DIID_DWebBrowserEvents };
for (size_t i = 0; i < arraysize(sinks); ++i) {
base::win::ScopedComPtr<IConnectionPoint> cp;
cpc->FindConnectionPoint(sinks[i], cp.Receive());
if (cp) {
base::win::ScopedComPtr<IEnumConnections> connections;
cp->EnumConnections(connections.Receive());
if (connections) {
CONNECTDATA cd = {0};
DWORD fetched = 0;
while (connections->Next(1, &cd, &fetched) == S_OK && fetched) {
PatchIfBuggy(cd.pUnk, sinks[i]);
cd.pUnk->Release();
fetched = 0;
}
}
}
}
}
patched_ = true;
web_browser2_ = browser;
return hr;
}
bool BuggyBhoTls::PatchIfBuggy(IUnknown* unk, const IID& diid) {
DCHECK(unk);
PROC* methods = *reinterpret_cast<PROC**>(unk);
HMODULE mod = base::GetModuleFromAddress(methods[0]);
if (!IsBuggyBho(mod))
return false;
base::win::ScopedComPtr<IDispatch> disp;
HRESULT hr = unk->QueryInterface(diid,
reinterpret_cast<void**>(disp.Receive()));
if (FAILED(hr)) // Sometimes only IDispatch QI is supported
hr = disp.QueryFrom(unk);
DCHECK(SUCCEEDED(hr));
if (SUCCEEDED(hr)) {
const int kInvokeIndex = 6;
DCHECK(static_cast<IUnknown*>(disp) == unk);
if (SUCCEEDED(PatchInvokeMethod(&methods[kInvokeIndex]))) {
AddBuggyObject(disp);
}
}
return false;
}
// static
STDMETHODIMP BuggyBhoTls::BuggyBhoInvoke(InvokeFunc original, IDispatch* me,
DISPID dispid, REFIID riid, LCID lcid,
WORD flags, DISPPARAMS* params,
VARIANT* result, EXCEPINFO* ei,
UINT* err) {
DVLOG(1) << __FUNCTION__;
DCHECK(BuggyBhoTls::GetInstance())
<< "You must first have an instance of BuggyBhoTls on this thread";
if (BuggyBhoTls::GetInstance() &&
BuggyBhoTls::GetInstance()->ShouldSkipInvoke(me)) {
// Ignore this call and avoid the bug.
// TODO(tommi): Maybe we should check a specific list of DISPIDs too?
return S_OK;
}
// No need to report crashes in those known-to-be-buggy DLLs.
ExceptionBarrierReportOnlyModule barrier;
return original(me, dispid, riid, lcid, flags, params, result, ei, err);
}
// static
HRESULT BuggyBhoTls::PatchInvokeMethod(PROC* invoke) {
CCritSecLock lock(_pAtlModule->m_csStaticDataInitAndTypeInfo.m_sec, true);
FunctionStub* stub = FunctionStub::FromCode(*invoke);
if (stub)
return S_FALSE;
DWORD flags = 0;
if (!::VirtualProtect(invoke, sizeof(PROC), PAGE_EXECUTE_READWRITE, &flags))
return AtlHresultFromLastError();
HRESULT hr = S_OK;
stub = FunctionStub::Create(reinterpret_cast<uintptr_t>(*invoke),
BuggyBhoInvoke);
if (!stub) {
hr = E_OUTOFMEMORY;
} else {
if (!vtable_patch::internal::ReplaceFunctionPointer(
reinterpret_cast<void**>(invoke), stub->code(),
reinterpret_cast<void*>(stub->argument()))) {
hr = E_UNEXPECTED;
FunctionStub::Destroy(stub);
} else {
PinModule(); // No backing out now.
::FlushInstructionCache(::GetCurrentProcess(), invoke, sizeof(PROC));
}
}
::VirtualProtect(invoke, sizeof(PROC), flags, &flags);
return hr;
}
} // end namespace buggy_bho
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