mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// 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 <stdint.h>
|
|
|
|
#include "base/process/process_metrics.h"
|
|
#include "base/synchronization/lock.h"
|
|
#include "build/build_config.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
|