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