mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 14:26:09 +03:00
80 lines
2.5 KiB
C++
80 lines
2.5 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 <stdint.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#if defined(OS_LINUX)
|
||
|
|
#include <sys/resource.h>
|
||
|
|
#endif // defined(OS_LINUX)
|
||
|
|
|
||
|
|
#if defined(OS_MACOSX) && !defined(OS_IOS)
|
||
|
|
#include <mach/mach.h>
|
||
|
|
#include <mach/mach_vm.h>
|
||
|
|
#endif // defined(OS_MACOSX) && !defined(OS_IOS)
|
||
|
|
|
||
|
|
#include "base/posix/eintr_wrapper.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, int prot) {
|
||
|
|
DCHECK(end > start);
|
||
|
|
const uintptr_t page_mask = ~(base::GetPageSize() - 1);
|
||
|
|
const uintptr_t page_start = reinterpret_cast<uintptr_t>(start) & page_mask;
|
||
|
|
return mprotect(reinterpret_cast<void*>(page_start),
|
||
|
|
reinterpret_cast<uintptr_t>(end) - page_start, prot) == 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
bool AutoWritableMemory::SetMemoryReadWrite(void* start, void* end) {
|
||
|
|
return SetMemory(start, end, PROT_READ | PROT_WRITE);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool AutoWritableMemory::SetMemoryReadOnly(void* start, void* end) {
|
||
|
|
return SetMemory(start, end, PROT_READ);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(OS_LINUX)
|
||
|
|
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;
|
||
|
|
|
||
|
|
// Note: We've casted away const here, which should not be meaningful since
|
||
|
|
// if the memory is written to we will abort immediately.
|
||
|
|
int result =
|
||
|
|
getrlimit(RLIMIT_NPROC, reinterpret_cast<struct rlimit*>(page_start));
|
||
|
|
DCHECK_EQ(result, -1);
|
||
|
|
DCHECK_EQ(errno, EFAULT);
|
||
|
|
#endif // DCHECK_IS_ON()
|
||
|
|
}
|
||
|
|
#elif defined(OS_MACOSX) && !defined(OS_IOS)
|
||
|
|
void AssertMemoryIsReadOnly(const void* ptr) {
|
||
|
|
#if DCHECK_IS_ON()
|
||
|
|
mach_port_t object_name;
|
||
|
|
vm_region_basic_info_64 region_info;
|
||
|
|
mach_vm_size_t size = 1;
|
||
|
|
mach_msg_type_number_t count = VM_REGION_BASIC_INFO_COUNT_64;
|
||
|
|
|
||
|
|
kern_return_t kr = mach_vm_region(
|
||
|
|
mach_task_self(), reinterpret_cast<mach_vm_address_t*>(&ptr), &size,
|
||
|
|
VM_REGION_BASIC_INFO_64, reinterpret_cast<vm_region_info_t>(®ion_info),
|
||
|
|
&count, &object_name);
|
||
|
|
DCHECK_EQ(kr, KERN_SUCCESS);
|
||
|
|
DCHECK_EQ(region_info.protection, VM_PROT_READ);
|
||
|
|
#endif // DCHECK_IS_ON()
|
||
|
|
}
|
||
|
|
#endif // defined(OS_LINUX) || (defined(OS_MACOSX) && !defined(OS_IOS))
|
||
|
|
|
||
|
|
} // namespace base
|