0c572d01af
If the underlying local map changes, it's possible for multiple
threads to try and modify the map data associated with the UnwindLocalMap
object. Add a lock when generating the local map to avoid this problem.
In addition, add a read lock whenever any caller gets the maps iterator.
Updated all iterator callers to make this lock.
Bug: 29387050
Bug: 31067025
(cherry picked from commit 3a14004c7f)
Change-Id: Id00116f156a24b36085c0d5dfc3dde4d2ac55194
125 lines
3.4 KiB
C++
125 lines
3.4 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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#ifndef _BACKTRACE_BACKTRACE_MAP_H
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#define _BACKTRACE_BACKTRACE_MAP_H
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#include <stdint.h>
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#include <sys/types.h>
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#ifdef USE_MINGW
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// MINGW does not define these constants.
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#define PROT_NONE 0
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#define PROT_READ 0x1
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#define PROT_WRITE 0x2
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#define PROT_EXEC 0x4
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#else
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#include <sys/mman.h>
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#endif
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#include <deque>
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#include <string>
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#include <vector>
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struct backtrace_map_t {
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uintptr_t start = 0;
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uintptr_t end = 0;
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uintptr_t offset = 0;
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uintptr_t load_base = 0;
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int flags = 0;
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std::string name;
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};
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class BacktraceMap {
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public:
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// If uncached is true, then parse the current process map as of the call.
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// Passing a map created with uncached set to true to Backtrace::Create()
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// is unsupported.
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static BacktraceMap* Create(pid_t pid, bool uncached = false);
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static BacktraceMap* Create(pid_t pid, const std::vector<backtrace_map_t>& maps);
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virtual ~BacktraceMap();
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// Fill in the map data structure for the given address.
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virtual void FillIn(uintptr_t addr, backtrace_map_t* map);
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// The flags returned are the same flags as used by the mmap call.
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// The values are PROT_*.
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int GetFlags(uintptr_t pc) {
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backtrace_map_t map;
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FillIn(pc, &map);
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if (IsValid(map)) {
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return map.flags;
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}
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return PROT_NONE;
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}
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bool IsReadable(uintptr_t pc) { return GetFlags(pc) & PROT_READ; }
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bool IsWritable(uintptr_t pc) { return GetFlags(pc) & PROT_WRITE; }
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bool IsExecutable(uintptr_t pc) { return GetFlags(pc) & PROT_EXEC; }
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// In order to use the iterators on this object, a caller must
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// call the LockIterator and UnlockIterator function to guarantee
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// that the data does not change while it's being used.
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virtual void LockIterator() {}
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virtual void UnlockIterator() {}
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typedef std::deque<backtrace_map_t>::iterator iterator;
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iterator begin() { return maps_.begin(); }
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iterator end() { return maps_.end(); }
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typedef std::deque<backtrace_map_t>::const_iterator const_iterator;
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const_iterator begin() const { return maps_.begin(); }
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const_iterator end() const { return maps_.end(); }
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virtual bool Build();
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static inline bool IsValid(const backtrace_map_t& map) {
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return map.end > 0;
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}
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static uintptr_t GetRelativePc(const backtrace_map_t& map, uintptr_t pc) {
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if (IsValid(map)) {
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return pc - map.start + map.load_base;
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} else {
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return pc;
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}
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}
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protected:
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BacktraceMap(pid_t pid);
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virtual bool ParseLine(const char* line, backtrace_map_t* map);
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std::deque<backtrace_map_t> maps_;
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pid_t pid_;
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};
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class ScopedBacktraceMapIteratorLock {
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public:
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explicit ScopedBacktraceMapIteratorLock(BacktraceMap* map) : map_(map) {
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map->LockIterator();
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}
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~ScopedBacktraceMapIteratorLock() {
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map_->UnlockIterator();
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}
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private:
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BacktraceMap* map_;
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};
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#endif // _BACKTRACE_BACKTRACE_MAP_H
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