117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
// Copyright 2018 The Crashpad Authors
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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 "snapshot/sanitized/sanitization_information.h"
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#include <limits>
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#include "base/logging.h"
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#include "client/annotation.h"
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namespace crashpad {
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namespace {
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template <typename Pointer>
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bool ReadAllowedAnnotations(const ProcessMemoryRange& memory,
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VMAddress list_address,
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std::vector<std::string>* allowed_annotations) {
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if (!list_address) {
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return true;
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}
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std::vector<std::string> local_allowed_annotations;
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Pointer name_address;
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while (memory.Read(list_address, sizeof(name_address), &name_address)) {
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if (!name_address) {
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allowed_annotations->swap(local_allowed_annotations);
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return true;
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}
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std::string name;
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if (!memory.ReadCStringSizeLimited(
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name_address, Annotation::kNameMaxLength, &name)) {
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return false;
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}
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local_allowed_annotations.push_back(name);
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list_address += sizeof(Pointer);
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}
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return false;
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}
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} // namespace
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bool ReadAllowedAnnotations(const ProcessMemoryRange& memory,
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VMAddress list_address,
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std::vector<std::string>* allowed_annotations) {
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return memory.Is64Bit() ? ReadAllowedAnnotations<uint64_t>(
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memory, list_address, allowed_annotations)
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: ReadAllowedAnnotations<uint32_t>(
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memory, list_address, allowed_annotations);
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}
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bool ReadAllowedMemoryRanges(
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const ProcessMemoryRange& memory,
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VMAddress list_address,
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std::vector<std::pair<VMAddress, VMAddress>>* allowed_memory_ranges) {
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allowed_memory_ranges->clear();
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if (!list_address) {
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return true;
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}
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SanitizationAllowedMemoryRanges list;
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if (!memory.Read(list_address, sizeof(list), &list)) {
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LOG(ERROR) << "Failed to read allowed memory ranges";
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return false;
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}
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if (!list.size) {
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return true;
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}
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// An upper bound of entries that we never expect to see more than.
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constexpr size_t kMaxListSize = 256;
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if (list.size > kMaxListSize) {
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LOG(ERROR) << "list exceeded maximum, size=" << list.size;
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return false;
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}
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std::vector<SanitizationAllowedMemoryRanges::Range> ranges(list.size);
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if (!memory.Read(list.entries, sizeof(ranges[0]) * list.size,
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ranges.data())) {
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LOG(ERROR) << "Failed to read allowed memory ranges";
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return false;
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}
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const VMAddress vm_max = memory.Is64Bit()
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? std::numeric_limits<uint64_t>::max()
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: std::numeric_limits<uint32_t>::max();
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std::vector<std::pair<VMAddress, VMAddress>> local_allowed_memory_ranges;
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for (size_t i = 0; i < list.size; ++i) {
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if (ranges[i].base > vm_max || ranges[i].length > vm_max - ranges[i].base) {
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LOG(ERROR) << "Invalid range: base=" << ranges[i].base
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<< " length=" << ranges[i].length;
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return false;
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}
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local_allowed_memory_ranges.emplace_back(ranges[i].base,
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ranges[i].base + ranges[i].length);
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}
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allowed_memory_ranges->swap(local_allowed_memory_ranges);
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return true;
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}
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} // namespace crashpad
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