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53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
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// Copyright 2017 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/memory/protected_memory.h"
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#include <windows.h>
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#include <stdint.h>
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#include "base/process/process_metrics.h"
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#include "base/synchronization/lock.h"
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#include "build/build_config.h"
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namespace base {
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namespace {
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bool SetMemory(void* start, void* end, DWORD prot) {
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DCHECK(end > start);
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const uintptr_t page_mask = ~(base::GetPageSize() - 1);
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const uintptr_t page_start = reinterpret_cast<uintptr_t>(start) & page_mask;
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DWORD old_prot;
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return VirtualProtect(reinterpret_cast<void*>(page_start),
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reinterpret_cast<uintptr_t>(end) - page_start, prot,
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&old_prot) != 0;
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}
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} // namespace
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bool AutoWritableMemory::SetMemoryReadWrite(void* start, void* end) {
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return SetMemory(start, end, PAGE_READWRITE);
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}
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bool AutoWritableMemory::SetMemoryReadOnly(void* start, void* end) {
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return SetMemory(start, end, PAGE_READONLY);
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}
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void AssertMemoryIsReadOnly(const void* ptr) {
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#if DCHECK_IS_ON()
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const uintptr_t page_mask = ~(base::GetPageSize() - 1);
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const uintptr_t page_start = reinterpret_cast<uintptr_t>(ptr) & page_mask;
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MEMORY_BASIC_INFORMATION info;
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SIZE_T result =
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VirtualQuery(reinterpret_cast<LPCVOID>(page_start), &info, sizeof(info));
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DCHECK_GT(result, 0U);
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DCHECK(info.Protect == PAGE_READONLY);
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#endif // DCHECK_IS_ON()
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}
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} // namespace base
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