b7b0cecce4
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
Merged-In: Ibc4fe1d117e9b5840290454e90914ddc698d3cc2
(cherry picked from commit 4ae266ccbd)
109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/*
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* Copyright (C) 2016 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 _LIBUNWINDSTACK_MAP_INFO_H
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#define _LIBUNWINDSTACK_MAP_INFO_H
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#include <stdint.h>
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#include <atomic>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <unwindstack/Elf.h>
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#include <unwindstack/Memory.h>
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namespace unwindstack {
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struct MapInfo {
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MapInfo(MapInfo* map_info, uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
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const char* name)
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: start(start),
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end(end),
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offset(offset),
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flags(flags),
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name(name),
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prev_map(map_info),
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load_bias(static_cast<uint64_t>(-1)),
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build_id(0) {}
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MapInfo(MapInfo* map_info, uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
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const std::string& name)
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: start(start),
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end(end),
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offset(offset),
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flags(flags),
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name(name),
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prev_map(map_info),
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load_bias(static_cast<uint64_t>(-1)),
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build_id(0) {}
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~MapInfo();
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uint64_t start = 0;
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uint64_t end = 0;
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uint64_t offset = 0;
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uint16_t flags = 0;
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std::string name;
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std::shared_ptr<Elf> elf;
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// This value is only non-zero if the offset is non-zero but there is
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// no elf signature found at that offset.
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uint64_t elf_offset = 0;
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// This value is the offset from the map in memory that is the start
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// of the elf. This is not equal to offset when the linker splits
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// shared libraries into a read-only and read-execute map.
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uint64_t elf_start_offset = 0;
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MapInfo* prev_map = nullptr;
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std::atomic_uint64_t load_bias;
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// This is a pointer to a new'd std::string.
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// Using an atomic value means that we don't need to lock and will
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// make it easier to move to a fine grained lock in the future.
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std::atomic_uintptr_t build_id;
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// Set to true if the elf file data is coming from memory.
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bool memory_backed_elf = false;
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// This function guarantees it will never return nullptr.
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Elf* GetElf(const std::shared_ptr<Memory>& process_memory, ArchEnum expected_arch);
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uint64_t GetLoadBias(const std::shared_ptr<Memory>& process_memory);
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Memory* CreateMemory(const std::shared_ptr<Memory>& process_memory);
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bool GetFunctionName(uint64_t addr, std::string* name, uint64_t* func_offset);
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// Returns the raw build id read from the elf data.
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std::string GetBuildID();
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// Returns the printable version of the build id (hex dump of raw data).
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std::string GetPrintableBuildID();
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private:
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MapInfo(const MapInfo&) = delete;
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void operator=(const MapInfo&) = delete;
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Memory* GetFileMemory();
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bool InitFileMemoryFromPreviousReadOnlyMap(MemoryFileAtOffset* memory);
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// Protect the creation of the elf object.
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std::mutex mutex_;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_MAP_INFO_H
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