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// Copyright 2024 The Chromium Authors
// 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/bits.h"
#include "base/memory/page_size.h"
#include "base/process/process_metrics.h"
#include "base/synchronization/lock.h"
#include "build/build_config.h"
namespace base {
#if BUILDFLAG(PROTECTED_MEMORY_ENABLED)
namespace {
bool SetMemory(void* start, void* end, DWORD prot) {
CHECK(end > start);
const uintptr_t page_start =
bits::AlignDown(reinterpret_cast<uintptr_t>(start), GetPageSize());
DWORD old_prot;
return VirtualProtect(reinterpret_cast<void*>(page_start),
reinterpret_cast<uintptr_t>(end) - page_start, prot,
&old_prot) != 0;
}
} // namespace
namespace internal {
void CheckMemoryReadOnly(const void* ptr) {
const uintptr_t page_start =
bits::AlignDown(reinterpret_cast<uintptr_t>(ptr), GetPageSize());
MEMORY_BASIC_INFORMATION info;
SIZE_T result =
VirtualQuery(reinterpret_cast<LPCVOID>(page_start), &info, sizeof(info));
CHECK((result > 0U) && (info.Protect == PAGE_READONLY));
}
} // namespace internal
bool AutoWritableMemoryBase::SetMemoryReadWrite(void* start, void* end) {
return SetMemory(start, end, PAGE_READWRITE);
}
bool AutoWritableMemoryBase::SetMemoryReadOnly(void* start, void* end) {
return SetMemory(start, end, PAGE_READONLY);
}
#endif // BUILDFLAG(PROTECTED_MEMORY_ENABLED)
} // namespace base
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