86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/process/memory.h"
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#include <psapi.h>
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#include "base/logging.h"
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#include "base/memory/scoped_ptr.h"
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namespace base {
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namespace {
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void OnNoMemory() {
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// Kill the process. This is important for security, since WebKit doesn't
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// NULL-check many memory allocations. If a malloc fails, returns NULL, and
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// the buffer is then used, it provides a handy mapping of memory starting at
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// address 0 for an attacker to utilize.
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__debugbreak();
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_exit(1);
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}
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// HeapSetInformation function pointer.
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typedef BOOL (WINAPI* HeapSetFn)(HANDLE, HEAP_INFORMATION_CLASS, PVOID, SIZE_T);
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} // namespace
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bool EnableLowFragmentationHeap() {
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HMODULE kernel32 = GetModuleHandle(L"kernel32.dll");
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HeapSetFn heap_set = reinterpret_cast<HeapSetFn>(GetProcAddress(
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kernel32,
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"HeapSetInformation"));
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// On Windows 2000, the function is not exported. This is not a reason to
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// fail.
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if (!heap_set)
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return true;
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unsigned number_heaps = GetProcessHeaps(0, NULL);
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if (!number_heaps)
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return false;
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// Gives us some extra space in the array in case a thread is creating heaps
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// at the same time we're querying them.
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static const int MARGIN = 8;
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scoped_ptr<HANDLE[]> heaps(new HANDLE[number_heaps + MARGIN]);
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number_heaps = GetProcessHeaps(number_heaps + MARGIN, heaps.get());
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if (!number_heaps)
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return false;
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for (unsigned i = 0; i < number_heaps; ++i) {
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ULONG lfh_flag = 2;
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// Don't bother with the result code. It may fails on heaps that have the
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// HEAP_NO_SERIALIZE flag. This is expected and not a problem at all.
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heap_set(heaps[i],
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HeapCompatibilityInformation,
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&lfh_flag,
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sizeof(lfh_flag));
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}
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return true;
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}
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void EnableTerminationOnHeapCorruption() {
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// Ignore the result code. Supported on XP SP3 and Vista.
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HeapSetInformation(NULL, HeapEnableTerminationOnCorruption, NULL, 0);
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}
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void EnableTerminationOnOutOfMemory() {
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std::set_new_handler(&OnNoMemory);
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}
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HMODULE GetModuleFromAddress(void* address) {
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HMODULE instance = NULL;
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if (!::GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
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GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
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static_cast<char*>(address),
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&instance)) {
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NOTREACHED();
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}
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return instance;
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}
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} // namespace base
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