12385e3ad0
The backtrace structure used to include a pointer to a backtrace_map_t that represented the map data for a particular pc. This introduced a race condition where the pointer could be discarded, but the backtrace structure still contained a pointer to garbage memory. Now all of the map information is right in the structure. Bug: 19028453 Change-Id: If7088a73f3c6bf1f3bc8cdd2bb4b62e7cab831c0
149 lines
4 KiB
C++
149 lines
4 KiB
C++
/*
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* Copyright (C) 2014 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 <ctype.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <backtrace/backtrace_constants.h>
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#include <backtrace/BacktraceMap.h>
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#include <log/log.h>
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#include "thread_utils.h"
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#include "BacktraceImpl.h"
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BacktraceMap::BacktraceMap(pid_t pid) : pid_(pid) {
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if (pid_ < 0) {
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pid_ = getpid();
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}
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}
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BacktraceMap::~BacktraceMap() {
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}
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void BacktraceMap::FillIn(uintptr_t addr, backtrace_map_t* map) {
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for (BacktraceMap::const_iterator it = begin();
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it != end(); ++it) {
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if (addr >= it->start && addr < it->end) {
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*map = *it;
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return;
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}
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}
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*map = {};
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}
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bool BacktraceMap::ParseLine(const char* line, backtrace_map_t* map) {
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unsigned long int start;
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unsigned long int end;
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char permissions[5];
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int name_pos;
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#if defined(__APPLE__)
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// Mac OS vmmap(1) output:
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// __TEXT 0009f000-000a1000 [ 8K 8K] r-x/rwx SM=COW /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n
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// 012345678901234567890123456789012345678901234567890123456789
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// 0 1 2 3 4 5
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if (sscanf(line, "%*21c %lx-%lx [%*13c] %3c/%*3c SM=%*3c %n",
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&start, &end, permissions, &name_pos) != 3) {
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#else
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// Linux /proc/<pid>/maps lines:
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// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so\n
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// 012345678901234567890123456789012345678901234567890123456789
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// 0 1 2 3 4 5
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if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*d%n",
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&start, &end, permissions, &name_pos) != 3) {
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#endif
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return false;
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}
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map->start = start;
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map->end = end;
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map->flags = PROT_NONE;
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if (permissions[0] == 'r') {
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map->flags |= PROT_READ;
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}
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if (permissions[1] == 'w') {
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map->flags |= PROT_WRITE;
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}
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if (permissions[2] == 'x') {
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map->flags |= PROT_EXEC;
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}
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while (isspace(line[name_pos])) {
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name_pos += 1;
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}
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map->name = line+name_pos;
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if (!map->name.empty() && map->name[map->name.length()-1] == '\n') {
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map->name.erase(map->name.length()-1);
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}
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ALOGV("Parsed map: start=%p, end=%p, flags=%x, name=%s",
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reinterpret_cast<void*>(map->start), reinterpret_cast<void*>(map->end),
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map->flags, map->name.c_str());
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return true;
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}
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bool BacktraceMap::Build() {
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#if defined(__APPLE__)
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char cmd[sizeof(pid_t)*3 + sizeof("vmmap -w -resident -submap -allSplitLibs -interleaved ") + 1];
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#else
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char path[sizeof(pid_t)*3 + sizeof("/proc//maps") + 1];
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#endif
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char line[1024];
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#if defined(__APPLE__)
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// cmd is guaranteed to always be big enough to hold this string.
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snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid_);
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FILE* fp = popen(cmd, "r");
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#else
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// path is guaranteed to always be big enough to hold this string.
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snprintf(path, sizeof(path), "/proc/%d/maps", pid_);
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FILE* fp = fopen(path, "r");
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#endif
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if (fp == NULL) {
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return false;
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}
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while(fgets(line, sizeof(line), fp)) {
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backtrace_map_t map;
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if (ParseLine(line, &map)) {
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maps_.push_back(map);
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}
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}
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#if defined(__APPLE__)
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pclose(fp);
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#else
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fclose(fp);
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#endif
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return true;
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}
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#if defined(__APPLE__)
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// Corkscrew and libunwind don't compile on the mac, so create a generic
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// map object.
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BacktraceMap* BacktraceMap::Create(pid_t pid, bool uncached) {
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BacktraceMap* map = new BacktraceMap(pid);
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if (!map->Build()) {
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delete map;
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return NULL;
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}
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return map;
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}
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#endif
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