forked from mirrors/gecko-dev
c521758c5e
# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D58175 --HG-- extra : moz-landing-system : lando
132 lines
4.4 KiB
C++
132 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 https://mozilla.org/MPL/2.0/. */
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#include "nsWindowsDllInterceptor.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/BinarySearch.h"
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#include "mozilla/ImportDir.h"
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#include "mozilla/NativeNt.h"
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#include "mozilla/Types.h"
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#include "mozilla/WindowsDllBlocklist.h"
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#include "mozilla/WinHeaderOnlyUtils.h"
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#include "DllBlocklistInit.h"
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#include "freestanding/DllBlocklist.h"
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#if defined(_MSC_VER)
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extern "C" IMAGE_DOS_HEADER __ImageBase;
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#endif
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namespace mozilla {
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#if defined(MOZ_ASAN) || defined(_M_ARM64)
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// This DLL blocking code is incompatible with ASAN because
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// it is able to execute before ASAN itself has even initialized.
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// Also, AArch64 has not been tested with this.
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LauncherVoidResultWithLineInfo InitializeDllBlocklistOOP(
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const wchar_t* aFullImagePath, HANDLE aChildProcess) {
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return mozilla::Ok();
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}
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#else
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LauncherVoidResultWithLineInfo InitializeDllBlocklistOOP(
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const wchar_t* aFullImagePath, HANDLE aChildProcess) {
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CrossProcessDllInterceptor intcpt(aChildProcess);
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intcpt.Init(L"ntdll.dll");
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bool ok = freestanding::stub_NtMapViewOfSection.SetDetour(
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aChildProcess, intcpt, "NtMapViewOfSection",
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&freestanding::patched_NtMapViewOfSection);
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if (!ok) {
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return LAUNCHER_ERROR_GENERIC();
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}
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ok = freestanding::stub_LdrLoadDll.SetDetour(
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aChildProcess, intcpt, "LdrLoadDll", &freestanding::patched_LdrLoadDll);
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if (!ok) {
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return LAUNCHER_ERROR_GENERIC();
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}
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// Because aChildProcess has just been created in a suspended state, its
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// dynamic linker has not yet been initialized, thus its executable has
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// not yet been linked with ntdll.dll. If the blocklist hook intercepts a
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// library load prior to the link, the hook will be unable to invoke any
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// ntdll.dll functions.
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//
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// We know that the executable for our *current* process's binary is already
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// linked into ntdll, so we obtain the IAT from our own executable and graft
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// it onto the child process's IAT, thus enabling the child process's hook to
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// safely make its ntdll calls.
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HMODULE ourModule;
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# if defined(_MSC_VER)
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ourModule = reinterpret_cast<HMODULE>(&__ImageBase);
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# else
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ourModule = ::GetModuleHandleW(nullptr);
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# endif // defined(_MSC_VER)
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mozilla::nt::PEHeaders ourExeImage(ourModule);
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if (!ourExeImage) {
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return LAUNCHER_ERROR_FROM_WIN32(ERROR_BAD_EXE_FORMAT);
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}
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// As part of our mitigation of binary tampering, copy our import directory
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// from the original in our executable file.
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LauncherVoidResult importDirRestored = RestoreImportDirectory(
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aFullImagePath, ourExeImage, aChildProcess, ourModule);
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if (importDirRestored.isErr()) {
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return importDirRestored;
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}
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Maybe<Span<IMAGE_THUNK_DATA> > ntdllThunks =
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ourExeImage.GetIATThunksForModule("ntdll.dll");
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if (!ntdllThunks) {
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return LAUNCHER_ERROR_FROM_WIN32(ERROR_INVALID_DATA);
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}
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SIZE_T bytesWritten;
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{ // Scope for prot
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PIMAGE_THUNK_DATA firstIatThunk = ntdllThunks.value().data();
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SIZE_T iatLength = ntdllThunks.value().LengthBytes();
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AutoVirtualProtect prot(firstIatThunk, iatLength, PAGE_READWRITE,
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aChildProcess);
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if (!prot) {
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return LAUNCHER_ERROR_FROM_MOZ_WINDOWS_ERROR(prot.GetError());
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}
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ok = !!::WriteProcessMemory(aChildProcess, firstIatThunk, firstIatThunk,
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iatLength, &bytesWritten);
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if (!ok || bytesWritten != iatLength) {
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return LAUNCHER_ERROR_FROM_LAST();
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}
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}
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// Tell the mozglue blocklist that we have bootstrapped
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uint32_t newFlags = eDllBlocklistInitFlagWasBootstrapped;
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if (gBlocklistInitFlags & eDllBlocklistInitFlagWasBootstrapped) {
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// If we ourselves were bootstrapped, then we are starting a child process
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// and need to set the appropriate flag.
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newFlags |= eDllBlocklistInitFlagIsChildProcess;
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}
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ok = !!::WriteProcessMemory(aChildProcess, &gBlocklistInitFlags, &newFlags,
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sizeof(newFlags), &bytesWritten);
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if (!ok || bytesWritten != sizeof(newFlags)) {
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return LAUNCHER_ERROR_FROM_LAST();
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}
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return Ok();
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}
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#endif // defined(MOZ_ASAN) || defined(_M_ARM64)
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} // namespace mozilla
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