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/*
* Copyright (C) 2012-2014 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 <errno.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <android-base/file.h>
#include <android-base/unique_fd.h>
#include <android/log.h>
#include <async_safe/log.h>
#include <log/log.h>
#include <private/android_filesystem_config.h>
#include <unwindstack/AndroidUnwinder.h>
#include <unwindstack/Error.h>
#include <unwindstack/Regs.h>
#include "libdebuggerd/backtrace.h"
#include "libdebuggerd/open_files_list.h"
#include "libdebuggerd/utility.h"
#include "util.h"
#include "tombstone.pb.h"
using android::base::unique_fd;
using namespace std::literals::string_literals;
void engrave_tombstone_ucontext(int tombstone_fd, int proto_fd, uint64_t abort_msg_address,
siginfo_t* siginfo, ucontext_t* ucontext) {
pid_t uid = getuid();
pid_t pid = getpid();
pid_t target_tid = gettid();
log_t log;
log.current_tid = target_tid;
log.crashed_tid = target_tid;
log.tfd = tombstone_fd;
log.amfd_data = nullptr;
std::string thread_name = get_thread_name(target_tid);
std::vector<std::string> command_line = get_command_line(pid);
std::unique_ptr<unwindstack::Regs> regs(
unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), ucontext));
std::string selinux_label;
android::base::ReadFileToString("/proc/self/attr/current", &selinux_label);
std::map<pid_t, ThreadInfo> threads;
threads[target_tid] = ThreadInfo {
.registers = std::move(regs), .uid = uid, .tid = target_tid,
.thread_name = std::move(thread_name), .pid = pid, .command_line = std::move(command_line),
.selinux_label = std::move(selinux_label), .siginfo = siginfo,
// Only supported on aarch64 for now.
#if defined(__aarch64__)
.tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0),
.pac_enabled_keys = prctl(PR_PAC_GET_ENABLED_KEYS, 0, 0, 0, 0),
#endif
};
const ThreadInfo& thread = threads[pid];
if (!iterate_tids(pid, [&threads, &thread, &target_tid](pid_t tid) {
if (target_tid == tid) {
return;
}
threads[tid] = ThreadInfo{
.uid = thread.uid,
.tid = tid,
.pid = thread.pid,
.command_line = thread.command_line,
.thread_name = get_thread_name(tid),
.tagged_addr_ctrl = thread.tagged_addr_ctrl,
.pac_enabled_keys = thread.pac_enabled_keys,
};
})) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to open /proc/%d/task: %s", pid,
strerror(errno));
}
// Do not use the thread cache here because it will call pthread_key_create
// which doesn't work in linker code. See b/189803009.
// Use a normal cached object because the thread is stopped, and there
// is no chance of data changing between reads.
auto process_memory = unwindstack::Memory::CreateProcessMemoryCached(getpid());
unwindstack::AndroidLocalUnwinder unwinder(process_memory);
unwindstack::ErrorData error;
if (!unwinder.Initialize(error)) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to init unwinder object: %s",
unwindstack::GetErrorCodeString(error.code));
return;
}
ProcessInfo process_info;
process_info.abort_msg_address = abort_msg_address;
engrave_tombstone(unique_fd(dup(tombstone_fd)), unique_fd(dup(proto_fd)), &unwinder, threads,
target_tid, process_info, nullptr, nullptr);
}
void engrave_tombstone(unique_fd output_fd, unique_fd proto_fd,
unwindstack::AndroidUnwinder* unwinder,
const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
const ProcessInfo& process_info, OpenFilesList* open_files,
std::string* amfd_data) {
// Don't copy log messages to tombstone unless this is a development device.
Tombstone tombstone;
engrave_tombstone_proto(&tombstone, unwinder, threads, target_thread, process_info, open_files);
if (proto_fd != -1) {
if (!tombstone.SerializeToFileDescriptor(proto_fd.get())) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to write proto tombstone: %s",
strerror(errno));
}
}
log_t log;
log.current_tid = target_thread;
log.crashed_tid = target_thread;
log.tfd = output_fd.get();
log.amfd_data = amfd_data;
tombstone_proto_to_text(tombstone, [&log](const std::string& line, bool should_log) {
_LOG(&log, should_log ? logtype::HEADER : logtype::LOGS, "%s\n", line.c_str());
});
}
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