| // Copyright 2021 The Crashpad Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "util/ios/scoped_vm_read.h" |
| |
| #include "util/ios/raw_logging.h" |
| |
| namespace crashpad { |
| namespace internal { |
| |
| ScopedVMReadInternal::ScopedVMReadInternal() |
| : data_(0), vm_read_data_(0), vm_read_data_count_(0) {} |
| |
| ScopedVMReadInternal::~ScopedVMReadInternal() { |
| if (data_) { |
| kern_return_t kr = |
| vm_deallocate(mach_task_self(), vm_read_data_, vm_read_data_count_); |
| if (kr != KERN_SUCCESS) |
| CRASHPAD_RAW_LOG_ERROR(kr, "vm_deallocate"); |
| } |
| } |
| |
| bool ScopedVMReadInternal::Read(const void* data, const size_t data_length) { |
| if (data_) { |
| kern_return_t kr = |
| vm_deallocate(mach_task_self(), vm_read_data_, vm_read_data_count_); |
| if (kr != KERN_SUCCESS) |
| CRASHPAD_RAW_LOG_ERROR(kr, "vm_deallocate"); |
| data_ = 0; |
| } |
| vm_address_t data_address = reinterpret_cast<vm_address_t>(data); |
| vm_address_t page_region_address = trunc_page(data_address); |
| vm_size_t page_region_size = |
| round_page(data_address - page_region_address + data_length); |
| kern_return_t kr = vm_read(mach_task_self(), |
| page_region_address, |
| page_region_size, |
| &vm_read_data_, |
| &vm_read_data_count_); |
| |
| if (kr == KERN_SUCCESS) { |
| data_ = vm_read_data_ + (data_address - page_region_address); |
| return true; |
| } else { |
| // It's expected that this will sometimes fail. Don't log here. |
| return false; |
| } |
| } |
| |
| } // namespace internal |
| } // namespace crashpad |