4ae266ccbd
Modify the unwinder library to indicate that at least one of the stack frames contains an elf file that is unreadable. Modify debuggerd to display a note about the unreadable frame and a possible way to fix it. Bug: 129769339 Test: New unit tests pass. Test: Ran an app that crashes and has an unreadable file and verified the Test: message is displayed. Then setenforce 0 and verify the message is Test: not displayed. Change-Id: Ibc4fe1d117e9b5840290454e90914ddc698d3cc2
120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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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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*/
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#define LOG_TAG "DEBUG"
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#include "libdebuggerd/backtrace.h"
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#include <errno.h>
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#include <dirent.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ptrace.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <map>
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#include <memory>
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#include <string>
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#include <android-base/unique_fd.h>
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#include <log/log.h>
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#include <unwindstack/Unwinder.h>
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#include "libdebuggerd/types.h"
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#include "libdebuggerd/utility.h"
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static void dump_process_header(log_t* log, pid_t pid, const char* process_name) {
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time_t t = time(NULL);
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struct tm tm;
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localtime_r(&t, &tm);
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char timestr[64];
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strftime(timestr, sizeof(timestr), "%F %T", &tm);
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_LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, timestr);
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if (process_name) {
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_LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", process_name);
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}
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_LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING);
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}
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static void dump_process_footer(log_t* log, pid_t pid) {
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_LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
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}
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void dump_backtrace_thread(int output_fd, unwindstack::Unwinder* unwinder,
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const ThreadInfo& thread) {
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log_t log;
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log.tfd = output_fd;
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log.amfd_data = nullptr;
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_LOG(&log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread.thread_name.c_str(), thread.tid);
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unwinder->SetRegs(thread.registers.get());
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unwinder->Unwind();
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if (unwinder->NumFrames() == 0) {
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_LOG(&log, logtype::THREAD, "Unwind failed: tid = %d", thread.tid);
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return;
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}
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log_backtrace(&log, unwinder, " ");
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}
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void dump_backtrace(android::base::unique_fd output_fd, unwindstack::Unwinder* unwinder,
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const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) {
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log_t log;
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log.tfd = output_fd.get();
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log.amfd_data = nullptr;
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auto target = thread_info.find(target_thread);
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if (target == thread_info.end()) {
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ALOGE("failed to find target thread in thread info");
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return;
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}
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dump_process_header(&log, target->second.pid, target->second.process_name.c_str());
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dump_backtrace_thread(output_fd.get(), unwinder, target->second);
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for (const auto& [tid, info] : thread_info) {
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if (tid != target_thread) {
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dump_backtrace_thread(output_fd.get(), unwinder, info);
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}
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}
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dump_process_footer(&log, target->second.pid);
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}
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void dump_backtrace_header(int output_fd) {
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log_t log;
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log.tfd = output_fd;
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log.amfd_data = nullptr;
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char process_name[128];
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read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>");
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dump_process_header(&log, getpid(), process_name);
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}
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void dump_backtrace_footer(int output_fd) {
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log_t log;
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log.tfd = output_fd;
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log.amfd_data = nullptr;
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dump_process_footer(&log, getpid());
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}
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