blob: 4927412bad2bd7f9d3509925e5721daeb5978fb6 [file] [log] [blame]
// Copyright 2017 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/memory/protected_memory.h"
#include <windows.h>
#include "base/process/process_metrics.h"
#include "base/synchronization/lock.h"
#include "build/build_config.h"
#include "starboard/types.h"
namespace base {
namespace {
bool SetMemory(void* start, void* end, DWORD prot) {
DCHECK(end > start);
const uintptr_t page_mask = ~(base::GetPageSize() - 1);
const uintptr_t page_start = reinterpret_cast<uintptr_t>(start) & page_mask;
DWORD old_prot;
return VirtualProtect(reinterpret_cast<void*>(page_start),
reinterpret_cast<uintptr_t>(end) - page_start, prot,
&old_prot) != 0;
}
} // namespace
bool AutoWritableMemory::SetMemoryReadWrite(void* start, void* end) {
return SetMemory(start, end, PAGE_READWRITE);
}
bool AutoWritableMemory::SetMemoryReadOnly(void* start, void* end) {
return SetMemory(start, end, PAGE_READONLY);
}
void AssertMemoryIsReadOnly(const void* ptr) {
#if DCHECK_IS_ON()
const uintptr_t page_mask = ~(base::GetPageSize() - 1);
const uintptr_t page_start = reinterpret_cast<uintptr_t>(ptr) & page_mask;
MEMORY_BASIC_INFORMATION info;
SIZE_T result =
VirtualQuery(reinterpret_cast<LPCVOID>(page_start), &info, sizeof(info));
DCHECK_GT(result, 0U);
DCHECK(info.Protect == PAGE_READONLY);
#endif // DCHECK_IS_ON()
}
} // namespace base