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9f6d86742d
This also adds MachErrorMessage(), a test-only function that’s a dependency of TaskMemory’s test, and related test-only error message functions. TEST=util_test TaskMemory.* R=rsesek@chromium.org Review URL: https://codereview.chromium.org/438993002
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/mach/task_memory.h"
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#include <mach/mach_vm.h>
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#include <string.h>
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#include <algorithm>
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#include "base/logging.h"
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#include "base/mac/mach_logging.h"
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#include "base/mac/scoped_mach_vm.h"
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#include "base/strings/stringprintf.h"
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namespace crashpad {
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TaskMemory::TaskMemory(mach_port_t task) : task_(task) {
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}
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bool TaskMemory::Read(mach_vm_address_t address, size_t size, void* buffer) {
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if (size == 0) {
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return true;
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}
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mach_vm_address_t region_address = mach_vm_trunc_page(address);
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mach_vm_size_t region_size =
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mach_vm_round_page(address - region_address + size);
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vm_offset_t region;
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mach_msg_type_number_t region_count;
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kern_return_t kr =
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mach_vm_read(task_, region_address, region_size, ®ion, ®ion_count);
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if (kr != KERN_SUCCESS) {
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MACH_LOG(WARNING, kr) << base::StringPrintf(
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"mach_vm_read(0x%llx, 0x%llx)", region_address, region_size);
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return false;
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}
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DCHECK_EQ(region_count, region_size);
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base::mac::ScopedMachVM region_owner(region, region_count);
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const char* region_base = reinterpret_cast<const char*>(region);
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memcpy(buffer, ®ion_base[address - region_address], size);
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return true;
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}
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bool TaskMemory::ReadCString(mach_vm_address_t address, std::string* string) {
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return ReadCStringInternal(address, false, 0, string);
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}
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bool TaskMemory::ReadCStringSizeLimited(mach_vm_address_t address,
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mach_vm_size_t size,
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std::string* string) {
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return ReadCStringInternal(address, true, size, string);
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}
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bool TaskMemory::ReadCStringInternal(mach_vm_address_t address,
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bool has_size,
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mach_vm_size_t size,
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std::string* string) {
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if (has_size) {
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if (size == 0) {
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string->clear();
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return true;
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}
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} else {
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size = PAGE_SIZE;
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}
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std::string local_string;
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mach_vm_address_t read_address = address;
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do {
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mach_vm_size_t read_length =
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std::min(size, PAGE_SIZE - (read_address % PAGE_SIZE));
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std::string read_string(read_length, '\0');
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if (!Read(read_address, read_length, &read_string[0])) {
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return false;
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}
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size_t terminator = read_string.find_first_of('\0');
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if (terminator == std::string::npos) {
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local_string.append(read_string);
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} else {
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local_string.append(read_string, 0, terminator);
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string->swap(local_string);
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return true;
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}
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if (has_size) {
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size -= read_length;
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}
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read_address = mach_vm_trunc_page(read_address + read_length);
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} while ((!has_size || size > 0) && read_address > address);
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LOG(WARNING) << base::StringPrintf("unterminated string at 0x%llx", address);
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return false;
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}
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} // namespace crashpad
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