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android_system_core/debuggerd/libdebuggerd/tombstone_proto.cpp
Devin Moore 4647b6b305 Add page size info to tombstone 
Now that Android devices can use 16k page size, it's important that we
know what configuration the device is in when see issues.

1) If the device is in 4k mode, we see nothing new.

2) If the device is in 16k mode, we see this line in the tombstones:

Page size: 16

3) If the device is in 4k mode, but was previous in 16k mode we see:

Has been in 16kb mode: yes

Test: atest debuggerd_test
Test: atest debuggerd_test with ro.misctrl.16kb_before="1"
Test: adb shell cat /data/tombstones/tombstone_00
Bug: 335247092
Change-Id: If7ca3b0954a01070ff413758296460ca1d023ca5
2024-05-06 22:20:04 +00:00

780 lines
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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.
*/
#define LOG_TAG "DEBUG"
#include "libdebuggerd/tombstone.h"
#include "libdebuggerd/gwp_asan.h"
#if defined(USE_SCUDO)
#include "libdebuggerd/scudo.h"
#endif
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <signal.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/sysinfo.h>
#include <time.h>
#include <memory>
#include <optional>
#include <set>
#include <string>
#include <async_safe/log.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <android/log.h>
#include <android/set_abort_message.h>
#include <bionic/macros.h>
#include <bionic/reserved_signals.h>
#include <bionic/crash_detail_internal.h>
#include <log/log.h>
#include <log/log_read.h>
#include <log/logprint.h>
#include <private/android_filesystem_config.h>
#include <procinfo/process.h>
#include <unwindstack/AndroidUnwinder.h>
#include <unwindstack/Error.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Regs.h>
#include "libdebuggerd/open_files_list.h"
#include "libdebuggerd/utility.h"
#include "util.h"
#include "tombstone.pb.h"
using android::base::StringPrintf;
// The maximum number of messages to save in the protobuf per file.
static constexpr size_t kMaxLogMessages = 500;
// Use the demangler from libc++.
extern "C" char* __cxa_demangle(const char*, char*, size_t*, int* status);
static Architecture get_arch() {
#if defined(__arm__)
return Architecture::ARM32;
#elif defined(__aarch64__)
return Architecture::ARM64;
#elif defined(__i386__)
return Architecture::X86;
#elif defined(__x86_64__)
return Architecture::X86_64;
#elif defined(__riscv) && (__riscv_xlen == 64)
return Architecture::RISCV64;
#else
#error Unknown architecture!
#endif
}
static std::optional<std::string> get_stack_overflow_cause(uint64_t fault_addr, uint64_t sp,
unwindstack::Maps* maps) {
// Under stack MTE the stack pointer and/or the fault address can be tagged.
// In order to calculate deltas between them, strip off the tags off both
// addresses.
fault_addr = untag_address(fault_addr);
sp = untag_address(sp);
static constexpr uint64_t kMaxDifferenceBytes = 256;
uint64_t difference;
if (sp >= fault_addr) {
difference = sp - fault_addr;
} else {
difference = fault_addr - sp;
}
if (difference <= kMaxDifferenceBytes) {
// The faulting address is close to the current sp, check if the sp
// indicates a stack overflow.
// On arm, the sp does not get updated when the instruction faults.
// In this case, the sp will still be in a valid map, which is the
// last case below.
// On aarch64, the sp does get updated when the instruction faults.
// In this case, the sp will be in either an invalid map if triggered
// on the main thread, or in a guard map if in another thread, which
// will be the first case or second case from below.
std::shared_ptr<unwindstack::MapInfo> map_info = maps->Find(sp);
if (map_info == nullptr) {
return "stack pointer is in a non-existent map; likely due to stack overflow.";
} else if ((map_info->flags() & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)) {
return "stack pointer is not in a rw map; likely due to stack overflow.";
} else if ((sp - map_info->start()) <= kMaxDifferenceBytes) {
return "stack pointer is close to top of stack; likely stack overflow.";
}
}
return {};
}
void set_human_readable_cause(Cause* cause, uint64_t fault_addr) {
if (!cause->has_memory_error() || !cause->memory_error().has_heap()) {
return;
}
const MemoryError& memory_error = cause->memory_error();
const HeapObject& heap_object = memory_error.heap();
const char *tool_str;
switch (memory_error.tool()) {
case MemoryError_Tool_GWP_ASAN:
tool_str = "GWP-ASan";
break;
case MemoryError_Tool_SCUDO:
tool_str = "MTE";
break;
default:
tool_str = "Unknown";
break;
}
const char *error_type_str;
switch (memory_error.type()) {
case MemoryError_Type_USE_AFTER_FREE:
error_type_str = "Use After Free";
break;
case MemoryError_Type_DOUBLE_FREE:
error_type_str = "Double Free";
break;
case MemoryError_Type_INVALID_FREE:
error_type_str = "Invalid (Wild) Free";
break;
case MemoryError_Type_BUFFER_OVERFLOW:
error_type_str = "Buffer Overflow";
break;
case MemoryError_Type_BUFFER_UNDERFLOW:
error_type_str = "Buffer Underflow";
break;
default:
cause->set_human_readable(
StringPrintf("[%s]: Unknown error occurred at 0x%" PRIx64 ".", tool_str, fault_addr));
return;
}
uint64_t diff;
const char* location_str;
if (fault_addr < heap_object.address()) {
// Buffer Underflow, 6 bytes left of a 41-byte allocation at 0xdeadbeef.
location_str = "left of";
diff = heap_object.address() - fault_addr;
} else if (fault_addr - heap_object.address() < heap_object.size()) {
// Use After Free, 40 bytes into a 41-byte allocation at 0xdeadbeef.
location_str = "into";
diff = fault_addr - heap_object.address();
} else {
// Buffer Overflow, 6 bytes right of a 41-byte allocation at 0xdeadbeef.
location_str = "right of";
diff = fault_addr - heap_object.address() - heap_object.size();
}
// Suffix of 'bytes', i.e. 4 bytes' vs. '1 byte'.
const char* byte_suffix = "s";
if (diff == 1) {
byte_suffix = "";
}
cause->set_human_readable(StringPrintf(
"[%s]: %s, %" PRIu64 " byte%s %s a %" PRIu64 "-byte allocation at 0x%" PRIx64, tool_str,
error_type_str, diff, byte_suffix, location_str, heap_object.size(), heap_object.address()));
}
static void dump_probable_cause(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
const ProcessInfo& process_info, const ThreadInfo& target_thread) {
#if defined(USE_SCUDO)
ScudoCrashData scudo_crash_data(unwinder->GetProcessMemory().get(), process_info);
if (scudo_crash_data.CrashIsMine()) {
scudo_crash_data.AddCauseProtos(tombstone, unwinder);
return;
}
#endif
GwpAsanCrashData gwp_asan_crash_data(unwinder->GetProcessMemory().get(), process_info,
target_thread);
if (gwp_asan_crash_data.CrashIsMine()) {
gwp_asan_crash_data.AddCauseProtos(tombstone, unwinder);
return;
}
const siginfo *si = target_thread.siginfo;
auto fault_addr = reinterpret_cast<uint64_t>(si->si_addr);
unwindstack::Maps* maps = unwinder->GetMaps();
std::optional<std::string> cause;
if (si->si_signo == SIGSEGV && si->si_code == SEGV_MAPERR) {
if (fault_addr < 4096) {
cause = "null pointer dereference";
} else if (fault_addr == 0xffff0ffc) {
cause = "call to kuser_helper_version";
} else if (fault_addr == 0xffff0fe0) {
cause = "call to kuser_get_tls";
} else if (fault_addr == 0xffff0fc0) {
cause = "call to kuser_cmpxchg";
} else if (fault_addr == 0xffff0fa0) {
cause = "call to kuser_memory_barrier";
} else if (fault_addr == 0xffff0f60) {
cause = "call to kuser_cmpxchg64";
} else {
cause = get_stack_overflow_cause(fault_addr, target_thread.registers->sp(), maps);
}
} else if (si->si_signo == SIGSEGV && si->si_code == SEGV_ACCERR) {
auto map_info = maps->Find(fault_addr);
if (map_info != nullptr && map_info->flags() == PROT_EXEC) {
cause = "execute-only (no-read) memory access error; likely due to data in .text.";
} else {
cause = get_stack_overflow_cause(fault_addr, target_thread.registers->sp(), maps);
}
} else if (si->si_signo == SIGSYS && si->si_code == SYS_SECCOMP) {
cause = StringPrintf("seccomp prevented call to disallowed %s system call %d", ABI_STRING,
si->si_syscall);
}
if (cause) {
Cause *cause_proto = tombstone->add_causes();
cause_proto->set_human_readable(*cause);
}
}
static void dump_crash_details(Tombstone* tombstone,
std::shared_ptr<unwindstack::Memory>& process_memory,
const ProcessInfo& process_info) {
uintptr_t address = process_info.crash_detail_page;
while (address) {
struct crash_detail_page_t page;
if (!process_memory->ReadFully(address, &page, sizeof(page))) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to read crash detail page: %m");
break;
}
if (page.used > kNumCrashDetails) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "crash detail: page corrupted");
break;
}
for (size_t i = 0; i < page.used; ++i) {
const crash_detail_t& crash_detail = page.crash_details[i];
if (!crash_detail.data) {
continue;
}
std::string name(crash_detail.name_size, '\0');
if (!process_memory->ReadFully(reinterpret_cast<uintptr_t>(crash_detail.name), name.data(),
crash_detail.name_size)) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "crash detail: failed to read name: %m");
continue;
}
std::string data(crash_detail.data_size, '\0');
if (!process_memory->ReadFully(reinterpret_cast<uintptr_t>(crash_detail.data), data.data(),
crash_detail.data_size)) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG,
"crash detail: failed to read data for %s: %m", name.c_str());
continue;
}
auto* proto_detail = tombstone->add_crash_details();
proto_detail->set_name(name);
proto_detail->set_data(data);
}
address = reinterpret_cast<uintptr_t>(page.prev);
}
}
static void dump_abort_message(Tombstone* tombstone,
std::shared_ptr<unwindstack::Memory>& process_memory,
const ProcessInfo& process_info) {
uintptr_t address = process_info.abort_msg_address;
if (address == 0) {
return;
}
size_t length;
if (!process_memory->ReadFully(address, &length, sizeof(length))) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to read abort message header: %s",
strerror(errno));
return;
}
// The length field includes the length of the length field itself.
if (length < sizeof(size_t)) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG,
"abort message header malformed: claimed length = %zu", length);
return;
}
length -= sizeof(size_t);
// The abort message should be null terminated already, but reserve a spot for NUL just in case.
std::string msg;
msg.resize(length);
if (!process_memory->ReadFully(address + sizeof(length), &msg[0], length)) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to read abort message header: %s",
strerror(errno));
return;
}
// Remove any trailing newlines.
size_t index = msg.size();
while (index > 0 && (msg[index - 1] == '\0' || msg[index - 1] == '\n')) {
--index;
}
msg.resize(index);
tombstone->set_abort_message(msg);
}
static void dump_open_fds(Tombstone* tombstone, const OpenFilesList* open_files) {
if (open_files) {
for (auto& [fd, entry] : *open_files) {
FD f;
f.set_fd(fd);
const std::optional<std::string>& path = entry.path;
if (path) {
f.set_path(*path);
}
const std::optional<uint64_t>& fdsan_owner = entry.fdsan_owner;
if (fdsan_owner) {
const char* type = android_fdsan_get_tag_type(*fdsan_owner);
uint64_t value = android_fdsan_get_tag_value(*fdsan_owner);
f.set_owner(type);
f.set_tag(value);
}
*tombstone->add_open_fds() = f;
}
}
}
void fill_in_backtrace_frame(BacktraceFrame* f, const unwindstack::FrameData& frame) {
f->set_rel_pc(frame.rel_pc);
f->set_pc(frame.pc);
f->set_sp(frame.sp);
if (!frame.function_name.empty()) {
// TODO: Should this happen here, or on the display side?
char* demangled_name = __cxa_demangle(frame.function_name.c_str(), nullptr, nullptr, nullptr);
if (demangled_name) {
f->set_function_name(demangled_name);
free(demangled_name);
} else {
f->set_function_name(frame.function_name);
}
}
f->set_function_offset(frame.function_offset);
if (frame.map_info == nullptr) {
// No valid map associated with this frame.
f->set_file_name("<unknown>");
return;
}
if (!frame.map_info->name().empty()) {
f->set_file_name(frame.map_info->GetFullName());
} else {
f->set_file_name(StringPrintf("<anonymous:%" PRIx64 ">", frame.map_info->start()));
}
f->set_file_map_offset(frame.map_info->elf_start_offset());
f->set_build_id(frame.map_info->GetPrintableBuildID());
}
static void dump_registers(unwindstack::AndroidUnwinder* unwinder,
const std::unique_ptr<unwindstack::Regs>& regs, Thread& thread,
bool memory_dump) {
if (regs == nullptr) {
return;
}
unwindstack::Maps* maps = unwinder->GetMaps();
unwindstack::Memory* memory = unwinder->GetProcessMemory().get();
regs->IterateRegisters([&thread, memory_dump, maps, memory](const char* name, uint64_t value) {
Register r;
r.set_name(name);
r.set_u64(value);
*thread.add_registers() = r;
if (memory_dump) {
MemoryDump dump;
dump.set_register_name(name);
std::shared_ptr<unwindstack::MapInfo> map_info = maps->Find(untag_address(value));
if (map_info) {
dump.set_mapping_name(map_info->name());
}
constexpr size_t kNumBytesAroundRegister = 256;
constexpr size_t kNumTagsAroundRegister = kNumBytesAroundRegister / kTagGranuleSize;
char buf[kNumBytesAroundRegister];
uint8_t tags[kNumTagsAroundRegister];
ssize_t bytes = dump_memory(buf, sizeof(buf), tags, sizeof(tags), &value, memory);
if (bytes == -1) {
return;
}
dump.set_begin_address(value);
dump.set_memory(buf, bytes);
bool has_tags = false;
#if defined(__aarch64__)
for (size_t i = 0; i < kNumTagsAroundRegister; ++i) {
if (tags[i] != 0) {
has_tags = true;
}
}
#endif // defined(__aarch64__)
if (has_tags) {
dump.mutable_arm_mte_metadata()->set_memory_tags(tags, kNumTagsAroundRegister);
}
*thread.add_memory_dump() = std::move(dump);
}
});
}
static void dump_thread_backtrace(std::vector<unwindstack::FrameData>& frames, Thread& thread) {
std::set<std::string> unreadable_elf_files;
for (const auto& frame : frames) {
BacktraceFrame* f = thread.add_current_backtrace();
fill_in_backtrace_frame(f, frame);
if (frame.map_info != nullptr && frame.map_info->ElfFileNotReadable()) {
unreadable_elf_files.emplace(frame.map_info->name());
}
}
if (!unreadable_elf_files.empty()) {
auto unreadable_elf_files_proto = thread.mutable_unreadable_elf_files();
auto backtrace_note = thread.mutable_backtrace_note();
*backtrace_note->Add() =
"Function names and BuildId information is missing for some frames due";
*backtrace_note->Add() = "to unreadable libraries. For unwinds of apps, only shared libraries";
*backtrace_note->Add() = "found under the lib/ directory are readable.";
*backtrace_note->Add() = "On this device, run setenforce 0 to make the libraries readable.";
*backtrace_note->Add() = "Unreadable libraries:";
for (auto& name : unreadable_elf_files) {
*backtrace_note->Add() = " " + name;
*unreadable_elf_files_proto->Add() = name;
}
}
}
static void dump_thread(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
const ThreadInfo& thread_info, bool memory_dump = false) {
Thread thread;
thread.set_id(thread_info.tid);
thread.set_name(thread_info.thread_name);
thread.set_tagged_addr_ctrl(thread_info.tagged_addr_ctrl);
thread.set_pac_enabled_keys(thread_info.pac_enabled_keys);
unwindstack::AndroidUnwinderData data;
// Indicate we want a copy of the initial registers.
data.saved_initial_regs = std::make_optional<std::unique_ptr<unwindstack::Regs>>();
bool unwind_ret;
if (thread_info.registers != nullptr) {
unwind_ret = unwinder->Unwind(thread_info.registers.get(), data);
} else {
unwind_ret = unwinder->Unwind(thread_info.tid, data);
}
if (!unwind_ret) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "Unwind failed for tid %d: Error %s",
thread_info.tid, data.GetErrorString().c_str());
} else {
dump_thread_backtrace(data.frames, thread);
}
dump_registers(unwinder, *data.saved_initial_regs, thread, memory_dump);
auto& threads = *tombstone->mutable_threads();
threads[thread_info.tid] = thread;
}
static void dump_mappings(Tombstone* tombstone, unwindstack::Maps* maps,
std::shared_ptr<unwindstack::Memory>& process_memory) {
for (const auto& map_info : *maps) {
auto* map = tombstone->add_memory_mappings();
map->set_begin_address(map_info->start());
map->set_end_address(map_info->end());
map->set_offset(map_info->offset());
if (map_info->flags() & PROT_READ) {
map->set_read(true);
}
if (map_info->flags() & PROT_WRITE) {
map->set_write(true);
}
if (map_info->flags() & PROT_EXEC) {
map->set_execute(true);
}
map->set_mapping_name(map_info->name());
std::string build_id = map_info->GetPrintableBuildID();
if (!build_id.empty()) {
map->set_build_id(build_id);
}
map->set_load_bias(map_info->GetLoadBias(process_memory));
}
}
// This creates a fake log message that indicates an error occurred when
// reading the log.
static void add_error_log_msg(Tombstone* tombstone, const std::string&& error_msg) {
LogBuffer buffer;
buffer.set_name("ERROR");
LogMessage* log_msg = buffer.add_logs();
log_msg->set_timestamp("00-00 00:00:00.000");
log_msg->set_pid(0);
log_msg->set_tid(0);
log_msg->set_priority(ANDROID_LOG_ERROR);
log_msg->set_tag("");
log_msg->set_message(error_msg);
*tombstone->add_log_buffers() = std::move(buffer);
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "%s", error_msg.c_str());
}
static void dump_log_file(Tombstone* tombstone, const char* logger, pid_t pid) {
logger_list* logger_list = android_logger_list_open(android_name_to_log_id(logger),
ANDROID_LOG_NONBLOCK, kMaxLogMessages, pid);
if (logger_list == nullptr) {
add_error_log_msg(tombstone, android::base::StringPrintf("Cannot open log file %s", logger));
return;
}
LogBuffer buffer;
while (true) {
log_msg log_entry;
ssize_t actual = android_logger_list_read(logger_list, &log_entry);
if (actual < 0) {
if (actual == -EINTR) {
// interrupted by signal, retry
continue;
}
// Don't consider EAGAIN an error since this is a non-blocking call.
if (actual != -EAGAIN) {
add_error_log_msg(tombstone, android::base::StringPrintf("reading log %s failed (%s)",
logger, strerror(-actual)));
}
break;
} else if (actual == 0) {
break;
}
char timestamp_secs[32];
time_t sec = static_cast<time_t>(log_entry.entry.sec);
tm tm;
localtime_r(&sec, &tm);
strftime(timestamp_secs, sizeof(timestamp_secs), "%m-%d %H:%M:%S", &tm);
std::string timestamp =
StringPrintf("%s.%03d", timestamp_secs, log_entry.entry.nsec / 1'000'000);
// Msg format is: <priority:1><tag:N>\0<message:N>\0
char* msg = log_entry.msg();
if (msg == nullptr) {
continue;
}
unsigned char prio = msg[0];
char* tag = msg + 1;
msg = tag + strlen(tag) + 1;
// consume any trailing newlines
char* nl = msg + strlen(msg) - 1;
while (nl >= msg && *nl == '\n') {
*nl-- = '\0';
}
// Look for line breaks ('\n') and display each text line
// on a separate line, prefixed with the header, like logcat does.
do {
nl = strchr(msg, '\n');
if (nl != nullptr) {
*nl = '\0';
++nl;
}
LogMessage* log_msg = buffer.add_logs();
log_msg->set_timestamp(timestamp);
log_msg->set_pid(log_entry.entry.pid);
log_msg->set_tid(log_entry.entry.tid);
log_msg->set_priority(prio);
log_msg->set_tag(tag);
log_msg->set_message(msg);
} while ((msg = nl));
}
android_logger_list_free(logger_list);
if (!buffer.logs().empty()) {
buffer.set_name(logger);
*tombstone->add_log_buffers() = std::move(buffer);
}
}
static void dump_logcat(Tombstone* tombstone, pid_t pid) {
dump_log_file(tombstone, "system", pid);
dump_log_file(tombstone, "main", pid);
}
static void dump_tags_around_fault_addr(Signal* signal, const Tombstone& tombstone,
std::shared_ptr<unwindstack::Memory>& process_memory,
uintptr_t fault_addr) {
if (tombstone.arch() != Architecture::ARM64) return;
fault_addr = untag_address(fault_addr);
constexpr size_t kNumGranules = kNumTagRows * kNumTagColumns;
constexpr size_t kBytesToRead = kNumGranules * kTagGranuleSize;
// If the low part of the tag dump would underflow to the high address space, it's probably not
// a valid address for us to dump tags from.
if (fault_addr < kBytesToRead / 2) return;
constexpr uintptr_t kRowStartMask = ~(kNumTagColumns * kTagGranuleSize - 1);
size_t start_address = (fault_addr & kRowStartMask) - kBytesToRead / 2;
MemoryDump tag_dump;
size_t granules_to_read = kNumGranules;
// Attempt to read the first tag. If reading fails, this likely indicates the
// lowest touched page is inaccessible or not marked with PROT_MTE.
// Fast-forward over pages until one has tags, or we exhaust the search range.
while (process_memory->ReadTag(start_address) < 0) {
size_t page_size = sysconf(_SC_PAGE_SIZE);
size_t bytes_to_next_page = page_size - (start_address % page_size);
if (bytes_to_next_page >= granules_to_read * kTagGranuleSize) return;
start_address += bytes_to_next_page;
granules_to_read -= bytes_to_next_page / kTagGranuleSize;
}
tag_dump.set_begin_address(start_address);
std::string* mte_tags = tag_dump.mutable_arm_mte_metadata()->mutable_memory_tags();
for (size_t i = 0; i < granules_to_read; ++i) {
long tag = process_memory->ReadTag(start_address + i * kTagGranuleSize);
if (tag < 0) break;
mte_tags->push_back(static_cast<uint8_t>(tag));
}
if (!mte_tags->empty()) {
*signal->mutable_fault_adjacent_metadata() = tag_dump;
}
}
void engrave_tombstone_proto(Tombstone* tombstone, unwindstack::AndroidUnwinder* unwinder,
const std::map<pid_t, ThreadInfo>& threads, pid_t target_tid,
const ProcessInfo& process_info, const OpenFilesList* open_files) {
Tombstone result;
result.set_arch(get_arch());
result.set_build_fingerprint(android::base::GetProperty("ro.build.fingerprint", "unknown"));
result.set_revision(android::base::GetProperty("ro.revision", "unknown"));
result.set_timestamp(get_timestamp());
const ThreadInfo& target_thread = threads.at(target_tid);
result.set_pid(target_thread.pid);
result.set_tid(target_thread.tid);
result.set_uid(target_thread.uid);
result.set_selinux_label(target_thread.selinux_label);
// The main thread must have a valid siginfo.
CHECK(target_thread.siginfo != nullptr);
struct sysinfo si;
sysinfo(&si);
android::procinfo::ProcessInfo proc_info;
std::string error;
if (android::procinfo::GetProcessInfo(target_thread.pid, &proc_info, &error)) {
uint64_t starttime = proc_info.starttime / sysconf(_SC_CLK_TCK);
result.set_process_uptime(si.uptime - starttime);
} else {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to read process info: %s",
error.c_str());
}
result.set_page_size(getpagesize());
result.set_has_been_16kb_mode(android::base::GetBoolProperty("ro.misctrl.16kb_before", false));
auto cmd_line = result.mutable_command_line();
for (const auto& arg : target_thread.command_line) {
*cmd_line->Add() = arg;
}
if (!target_thread.siginfo) {
async_safe_fatal("siginfo missing");
}
Signal sig;
sig.set_number(target_thread.signo);
sig.set_name(get_signame(target_thread.siginfo));
sig.set_code(target_thread.siginfo->si_code);
sig.set_code_name(get_sigcode(target_thread.siginfo));
if (signal_has_sender(target_thread.siginfo, target_thread.pid)) {
sig.set_has_sender(true);
sig.set_sender_uid(target_thread.siginfo->si_uid);
sig.set_sender_pid(target_thread.siginfo->si_pid);
}
if (process_info.has_fault_address) {
sig.set_has_fault_address(true);
uintptr_t fault_addr = process_info.maybe_tagged_fault_address;
sig.set_fault_address(fault_addr);
dump_tags_around_fault_addr(&sig, result, unwinder->GetProcessMemory(), fault_addr);
}
*result.mutable_signal_info() = sig;
dump_abort_message(&result, unwinder->GetProcessMemory(), process_info);
dump_crash_details(&result, unwinder->GetProcessMemory(), process_info);
// Dump the target thread, but save the memory around the registers.
dump_thread(&result, unwinder, target_thread, /* memory_dump */ true);
for (const auto& [tid, thread_info] : threads) {
if (tid != target_tid) {
dump_thread(&result, unwinder, thread_info);
}
}
dump_probable_cause(&result, unwinder, process_info, target_thread);
dump_mappings(&result, unwinder->GetMaps(), unwinder->GetProcessMemory());
// Only dump logs on debuggable devices.
if (android::base::GetBoolProperty("ro.debuggable", false)) {
// Get the thread that corresponds to the main pid of the process.
const ThreadInfo& thread = threads.at(target_thread.pid);
// Do not attempt to dump logs of the logd process because the gathering
// of logs can hang until a timeout occurs.
if (thread.thread_name != "logd") {
dump_logcat(&result, target_thread.pid);
}
}
dump_open_fds(&result, open_files);
*tombstone = std::move(result);
}
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