30c942cf10
Under some conditions, /proc/<pid>/maps might return nothing. If we try and unwind in this case, we'll crash. Check this case and fail the unwind. Add checks that no other functions try and use map_ without checking for nullptr. Add logging when an unwind fails so it's clear what happened. Bug: 21162746 Change-Id: I56ce51dda0cfc9db20475a441f118108196aa07c
137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/*
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* Copyright (C) 2013 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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#include <inttypes.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <ucontext.h>
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#include <string>
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#include <base/stringprintf.h>
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#include <backtrace/Backtrace.h>
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#include <backtrace/BacktraceMap.h>
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#include <cutils/threads.h>
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#include "BacktraceLog.h"
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#include "thread_utils.h"
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#include "UnwindCurrent.h"
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#include "UnwindPtrace.h"
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using android::base::StringPrintf;
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//-------------------------------------------------------------------------
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// Backtrace functions.
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//-------------------------------------------------------------------------
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Backtrace::Backtrace(pid_t pid, pid_t tid, BacktraceMap* map)
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: pid_(pid), tid_(tid), map_(map), map_shared_(true) {
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if (map_ == nullptr) {
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map_ = BacktraceMap::Create(pid);
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map_shared_ = false;
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}
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}
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Backtrace::~Backtrace() {
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if (map_ && !map_shared_) {
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delete map_;
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map_ = nullptr;
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}
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}
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extern "C" char* __cxa_demangle(const char* mangled, char* buf, size_t* len,
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int* status);
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std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {
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std::string func_name = GetFunctionNameRaw(pc, offset);
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if (!func_name.empty()) {
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#if defined(__APPLE__)
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// Mac OS' __cxa_demangle demangles "f" as "float"; last tested on 10.7.
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if (func_name[0] != '_') {
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return func_name;
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}
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#endif
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char* name = __cxa_demangle(func_name.c_str(), 0, 0, 0);
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if (name) {
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func_name = name;
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free(name);
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}
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}
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return func_name;
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}
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bool Backtrace::VerifyReadWordArgs(uintptr_t ptr, word_t* out_value) {
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if (ptr & (sizeof(word_t)-1)) {
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BACK_LOGW("invalid pointer %p", reinterpret_cast<void*>(ptr));
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*out_value = static_cast<word_t>(-1);
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return false;
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}
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return true;
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}
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std::string Backtrace::FormatFrameData(size_t frame_num) {
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if (frame_num >= frames_.size()) {
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return "";
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}
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return FormatFrameData(&frames_[frame_num]);
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}
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std::string Backtrace::FormatFrameData(const backtrace_frame_data_t* frame) {
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const char* map_name;
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if (BacktraceMap::IsValid(frame->map) && !frame->map.name.empty()) {
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map_name = frame->map.name.c_str();
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} else {
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map_name = "<unknown>";
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}
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uintptr_t relative_pc = BacktraceMap::GetRelativePc(frame->map, frame->pc);
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std::string line(StringPrintf("#%02zu pc %" PRIPTR " %s", frame->num, relative_pc, map_name));
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if (!frame->func_name.empty()) {
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line += " (" + frame->func_name;
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if (frame->func_offset) {
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line += StringPrintf("+%" PRIuPTR, frame->func_offset);
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}
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line += ')';
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}
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return line;
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}
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void Backtrace::FillInMap(uintptr_t pc, backtrace_map_t* map) {
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if (map_ != nullptr) {
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map_->FillIn(pc, map);
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}
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}
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Backtrace* Backtrace::Create(pid_t pid, pid_t tid, BacktraceMap* map) {
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if (pid == BACKTRACE_CURRENT_PROCESS) {
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pid = getpid();
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if (tid == BACKTRACE_CURRENT_THREAD) {
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tid = gettid();
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}
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} else if (tid == BACKTRACE_CURRENT_THREAD) {
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tid = pid;
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}
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if (pid == getpid()) {
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return new UnwindCurrent(pid, tid, map);
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} else {
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return new UnwindPtrace(pid, tid, map);
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}
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}
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