60 lines
1.7 KiB
C++
60 lines
1.7 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 http://mozilla.org/MPL/2.0/. */
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#include "CacheNtDllThunk.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/Span.h"
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#include "mozilla/StaticPtr.h"
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namespace mozilla {
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static StaticAutoPtr<Buffer<IMAGE_THUNK_DATA>> sCachedNtDllThunk;
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// This static method initializes sCachedNtDllThunk. Because it's called in
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// XREMain::XRE_main, which happens long before WindowsProcessLauncher's ctor
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// accesses sCachedNtDllThunk, there is no race on sCachedNtDllThunk, thus
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// no mutex is needed.
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static void CacheNtDllThunk() {
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if (sCachedNtDllThunk) {
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return;
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}
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do {
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nt::PEHeaders ourExeImage(::GetModuleHandleW(nullptr));
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if (!ourExeImage) {
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break;
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}
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nt::PEHeaders ntdllImage(::GetModuleHandleW(L"ntdll.dll"));
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if (!ntdllImage) {
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break;
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}
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Maybe<Range<const uint8_t>> ntdllBoundaries = ntdllImage.GetBounds();
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if (!ntdllBoundaries) {
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break;
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}
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Maybe<Span<IMAGE_THUNK_DATA>> maybeNtDllThunks =
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ourExeImage.GetIATThunksForModule("ntdll.dll", ntdllBoundaries.ptr());
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if (maybeNtDllThunks.isNothing()) {
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break;
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}
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sCachedNtDllThunk = new Buffer<IMAGE_THUNK_DATA>(maybeNtDllThunks.value());
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return;
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} while (false);
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// Failed to cache IAT. Initializing the variable with nullptr.
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sCachedNtDllThunk = new Buffer<IMAGE_THUNK_DATA>();
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}
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static Buffer<IMAGE_THUNK_DATA>* GetCachedNtDllThunk() {
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return sCachedNtDllThunk;
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}
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} // namespace mozilla
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