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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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 "libdebuggerd/scudo.h"
#include "libdebuggerd/tombstone.h"
#include "unwindstack/Memory.h"
#include "unwindstack/Unwinder.h"
#include <android-base/macros.h>
#include <bionic/macros.h>
#include "tombstone.pb.h"
std::unique_ptr<char[]> AllocAndReadFully(unwindstack::Memory* process_memory, uint64_t addr,
size_t size) {
auto buf = std::make_unique<char[]>(size);
if (!process_memory->ReadFully(addr, buf.get(), size)) {
return std::unique_ptr<char[]>();
}
return buf;
}
ScudoCrashData::ScudoCrashData(unwindstack::Memory* process_memory,
const ProcessInfo& process_info) {
if (!process_info.has_fault_address) {
return;
}
auto stack_depot = AllocAndReadFully(process_memory, process_info.scudo_stack_depot,
__scudo_get_stack_depot_size());
auto region_info = AllocAndReadFully(process_memory, process_info.scudo_region_info,
__scudo_get_region_info_size());
auto ring_buffer = AllocAndReadFully(process_memory, process_info.scudo_ring_buffer,
__scudo_get_ring_buffer_size());
untagged_fault_addr_ = process_info.untagged_fault_address;
uintptr_t fault_page = untagged_fault_addr_ & ~(PAGE_SIZE - 1);
uintptr_t memory_begin = fault_page - PAGE_SIZE * 16;
if (memory_begin > fault_page) {
return;
}
uintptr_t memory_end = fault_page + PAGE_SIZE * 16;
if (memory_end < fault_page) {
return;
}
auto memory = std::make_unique<char[]>(memory_end - memory_begin);
for (auto i = memory_begin; i != memory_end; i += PAGE_SIZE) {
process_memory->ReadFully(i, memory.get() + i - memory_begin, PAGE_SIZE);
}
auto memory_tags = std::make_unique<char[]>((memory_end - memory_begin) / kTagGranuleSize);
for (auto i = memory_begin; i != memory_end; i += kTagGranuleSize) {
memory_tags[(i - memory_begin) / kTagGranuleSize] = process_memory->ReadTag(i);
}
__scudo_get_error_info(&error_info_, process_info.maybe_tagged_fault_address, stack_depot.get(),
region_info.get(), ring_buffer.get(), memory.get(), memory_tags.get(),
memory_begin, memory_end - memory_begin);
}
bool ScudoCrashData::CrashIsMine() const {
return error_info_.reports[0].error_type != UNKNOWN;
}
void ScudoCrashData::FillInCause(Cause* cause, const scudo_error_report* report,
unwindstack::Unwinder* unwinder) const {
MemoryError* memory_error = cause->mutable_memory_error();
HeapObject* heap_object = memory_error->mutable_heap();
memory_error->set_tool(MemoryError_Tool_SCUDO);
switch (report->error_type) {
case USE_AFTER_FREE:
memory_error->set_type(MemoryError_Type_USE_AFTER_FREE);
break;
case BUFFER_OVERFLOW:
memory_error->set_type(MemoryError_Type_BUFFER_OVERFLOW);
break;
case BUFFER_UNDERFLOW:
memory_error->set_type(MemoryError_Type_BUFFER_UNDERFLOW);
break;
default:
memory_error->set_type(MemoryError_Type_UNKNOWN);
break;
}
heap_object->set_address(report->allocation_address);
heap_object->set_size(report->allocation_size);
unwinder->SetDisplayBuildID(true);
heap_object->set_allocation_tid(report->allocation_tid);
for (size_t i = 0; i < arraysize(report->allocation_trace) && report->allocation_trace[i]; ++i) {
unwindstack::FrameData frame_data = unwinder->BuildFrameFromPcOnly(report->allocation_trace[i]);
BacktraceFrame* f = heap_object->add_allocation_backtrace();
fill_in_backtrace_frame(f, frame_data);
}
heap_object->set_deallocation_tid(report->deallocation_tid);
for (size_t i = 0; i < arraysize(report->deallocation_trace) && report->deallocation_trace[i];
++i) {
unwindstack::FrameData frame_data =
unwinder->BuildFrameFromPcOnly(report->deallocation_trace[i]);
BacktraceFrame* f = heap_object->add_deallocation_backtrace();
fill_in_backtrace_frame(f, frame_data);
}
set_human_readable_cause(cause, untagged_fault_addr_);
}
void ScudoCrashData::AddCauseProtos(Tombstone* tombstone, unwindstack::Unwinder* unwinder) const {
size_t report_num = 0;
while (report_num < sizeof(error_info_.reports) / sizeof(error_info_.reports[0]) &&
error_info_.reports[report_num].error_type != UNKNOWN) {
FillInCause(tombstone->add_causes(), &error_info_.reports[report_num++], unwinder);
}
}
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