blob: 6544bbacbff8e11825171541cf3743a932cc41ac [file] [log] [blame]
// Copyright 2018 The Crashpad Authors
//
// 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 "snapshot/sanitized/sanitization_information.h"
#include <limits>
#include "base/logging.h"
#include "client/annotation.h"
namespace crashpad {
namespace {
template <typename Pointer>
bool ReadAllowedAnnotations(const ProcessMemoryRange& memory,
VMAddress list_address,
std::vector<std::string>* allowed_annotations) {
if (!list_address) {
return true;
}
std::vector<std::string> local_allowed_annotations;
Pointer name_address;
while (memory.Read(list_address, sizeof(name_address), &name_address)) {
if (!name_address) {
allowed_annotations->swap(local_allowed_annotations);
return true;
}
std::string name;
if (!memory.ReadCStringSizeLimited(
name_address, Annotation::kNameMaxLength, &name)) {
return false;
}
local_allowed_annotations.push_back(name);
list_address += sizeof(Pointer);
}
return false;
}
} // namespace
bool ReadAllowedAnnotations(const ProcessMemoryRange& memory,
VMAddress list_address,
std::vector<std::string>* allowed_annotations) {
return memory.Is64Bit() ? ReadAllowedAnnotations<uint64_t>(
memory, list_address, allowed_annotations)
: ReadAllowedAnnotations<uint32_t>(
memory, list_address, allowed_annotations);
}
bool ReadAllowedMemoryRanges(
const ProcessMemoryRange& memory,
VMAddress list_address,
std::vector<std::pair<VMAddress, VMAddress>>* allowed_memory_ranges) {
allowed_memory_ranges->clear();
if (!list_address) {
return true;
}
SanitizationAllowedMemoryRanges list;
if (!memory.Read(list_address, sizeof(list), &list)) {
LOG(ERROR) << "Failed to read allowed memory ranges";
return false;
}
if (!list.size) {
return true;
}
// An upper bound of entries that we never expect to see more than.
constexpr size_t kMaxListSize = 256;
if (list.size > kMaxListSize) {
LOG(ERROR) << "list exceeded maximum, size=" << list.size;
return false;
}
std::vector<SanitizationAllowedMemoryRanges::Range> ranges(list.size);
if (!memory.Read(list.entries, sizeof(ranges[0]) * list.size,
ranges.data())) {
LOG(ERROR) << "Failed to read allowed memory ranges";
return false;
}
const VMAddress vm_max = memory.Is64Bit()
? std::numeric_limits<uint64_t>::max()
: std::numeric_limits<uint32_t>::max();
std::vector<std::pair<VMAddress, VMAddress>> local_allowed_memory_ranges;
for (size_t i = 0; i < list.size; ++i) {
if (ranges[i].base > vm_max || ranges[i].length > vm_max - ranges[i].base) {
LOG(ERROR) << "Invalid range: base=" << ranges[i].base
<< " length=" << ranges[i].length;
return false;
}
local_allowed_memory_ranges.emplace_back(ranges[i].base,
ranges[i].base + ranges[i].length);
}
allowed_memory_ranges->swap(local_allowed_memory_ranges);
return true;
}
} // namespace crashpad