Replace libbacktrace with libunwindstack directly. (60eb1979) · Commits · e / os / android_system_core

debuggerd/Android.bp

+0 −6

Original line number	Diff line number	Diff line
		@@ -114,7 +114,6 @@ cc_library_static {
		"libasync_safe",
		"libbase",
		"libdebuggerd",
		"libbacktrace",
		"libunwindstack",
		"libdexfile", // libunwindstack dependency
		"libdexfile_external", // libunwindstack dependency
		@@ -124,7 +123,6 @@ cc_library_static {
		],
		target: {
		recovery: {
		cflags: ["-DNO_LIBDEXFILE_SUPPORT"],
		exclude_static_libs: [
		"libartbase",
		"libdexfile",
		@@ -164,7 +162,6 @@ cc_library_static {

		srcs: [
		"libdebuggerd/backtrace.cpp",
		"libdebuggerd/elf_utils.cpp",
		"libdebuggerd/open_files_list.cpp",
		"libdebuggerd/tombstone.cpp",
		"libdebuggerd/utility.cpp",
		@@ -177,7 +174,6 @@ cc_library_static {
		include_dirs: ["bionic/libc"],

		static_libs: [
		"libbacktrace",
		"libdexfile_external", // libunwindstack dependency
		"libdexfile_support", // libunwindstack dependency
		"libunwindstack",
		@@ -223,7 +219,6 @@ cc_test {
		},

		shared_libs: [
		"libbacktrace",
		"libbase",
		"libcutils",
		"libdebuggerd_client",
		@@ -291,7 +286,6 @@ cc_binary {
		],

		shared_libs: [
		"libbacktrace",
		"libbase",
		"liblog",
		"libprocinfo",

debuggerd/crash_dump.cpp

+15 −16

Original line number	Diff line number	Diff line
		@@ -48,7 +48,12 @@
		#define ATRACE_TAG ATRACE_TAG_BIONIC
		#include <utils/Trace.h>

		#include <unwindstack/DexFiles.h>
		#include <unwindstack/JitDebug.h>
		#include <unwindstack/Maps.h>
		#include <unwindstack/Memory.h>
		#include <unwindstack/Regs.h>
		#include <unwindstack/Unwinder.h>

		#include "libdebuggerd/backtrace.h"
		#include "libdebuggerd/tombstone.h"
		@@ -63,8 +68,6 @@
		using android::base::unique_fd;
		using android::base::StringPrintf;

		using unwindstack::Regs;

		static bool pid_contains_tid(int pid_proc_fd, pid_t tid) {
		struct stat st;
		std::string task_path = StringPrintf("task/%d", tid);
		@@ -287,7 +290,8 @@ static void ReadCrashInfo(unique_fd& fd, siginfo_t* siginfo,
		case 1:
		*abort_msg_address = crash_info->data.v1.abort_msg_address;
		*siginfo = crash_info->data.v1.siginfo;
		regs->reset(Regs::CreateFromUcontext(Regs::CurrentArch(), &crash_info->data.v1.ucontext));
		regs->reset(unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(),
		&crash_info->data.v1.ucontext));
		break;

		default:
		@@ -469,7 +473,7 @@ int main(int argc, char** argv) {
		info.siginfo = &siginfo;
		info.signo = info.siginfo->si_signo;
		} else {
		info.registers.reset(Regs::RemoteGet(thread));
		info.registers.reset(unwindstack::Regs::RemoteGet(thread));
		if (!info.registers) {
		PLOG(WARNING) << "failed to fetch registers for thread " << thread;
		ptrace(PTRACE_DETACH, thread, 0, 0);
		@@ -562,30 +566,25 @@ int main(int argc, char** argv) {
		}

		// TODO: Use seccomp to lock ourselves down.
		std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(vm_pid, false));
		if (!map) {
		LOG(FATAL) << "failed to create backtrace map";
		}

		std::shared_ptr<unwindstack::Memory> process_memory = map->GetProcessMemory();
		if (!process_memory) {
		LOG(FATAL) << "failed to get unwindstack::Memory handle";
		unwindstack::UnwinderFromPid unwinder(256, vm_pid);
		if (!unwinder.Init(unwindstack::Regs::CurrentArch())) {
		LOG(FATAL) << "Failed to init unwinder object.";
		}

		std::string amfd_data;
		if (backtrace) {
		ATRACE_NAME("dump_backtrace");
		dump_backtrace(std::move(g_output_fd), map.get(), thread_info, g_target_thread);
		dump_backtrace(std::move(g_output_fd), &unwinder, thread_info, g_target_thread);
		} else {
		{
		ATRACE_NAME("fdsan table dump");
		populate_fdsan_table(&open_files, process_memory, fdsan_table_address);
		populate_fdsan_table(&open_files, unwinder.GetProcessMemory(), fdsan_table_address);
		}

		{
		ATRACE_NAME("engrave_tombstone");
		engrave_tombstone(std::move(g_output_fd), map.get(), process_memory.get(), thread_info,
		g_target_thread, abort_msg_address, &open_files, &amfd_data);
		engrave_tombstone(std::move(g_output_fd), &unwinder, thread_info, g_target_thread,
		abort_msg_address, &open_files, &amfd_data);
		}
		}

debuggerd/handler/debuggerd_fallback.cpp

+13 −6

Original line number	Diff line number	Diff line
		@@ -42,9 +42,12 @@
		#include <android-base/file.h>
		#include <android-base/unique_fd.h>
		#include <async_safe/log.h>
		#include <backtrace/BacktraceMap.h>
		#include <unwindstack/DexFiles.h>
		#include <unwindstack/JitDebug.h>
		#include <unwindstack/Maps.h>
		#include <unwindstack/Memory.h>
		#include <unwindstack/Regs.h>
		#include <unwindstack/Unwinder.h>

		#include "debuggerd/handler.h"
		#include "handler/fallback.h"
		@@ -55,7 +58,6 @@
		#include "libdebuggerd/tombstone.h"

		using android::base::unique_fd;
		using unwindstack::Regs;

		extern "C" bool __linker_enable_fallback_allocator();
		extern "C" void __linker_disable_fallback_allocator();
		@@ -73,17 +75,22 @@ static void debuggerd_fallback_trace(int output_fd, ucontext_t* ucontext) {
		}

		{
		std::unique_ptr<Regs> regs;
		std::unique_ptr<unwindstack::Regs> regs;

		ThreadInfo thread;
		thread.pid = getpid();
		thread.tid = gettid();
		thread.thread_name = get_thread_name(gettid());
		thread.registers.reset(Regs::CreateFromUcontext(Regs::CurrentArch(), ucontext));
		unwindstack::ArchEnum arch = unwindstack::Regs::CurrentArch();
		thread.registers.reset(unwindstack::Regs::CreateFromUcontext(arch, ucontext));

		// TODO: Create this once and store it in a global?
		std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid()));
		dump_backtrace_thread(output_fd, map.get(), thread);
		unwindstack::UnwinderFromPid unwinder(kMaxFrames, getpid());
		if (unwinder.Init(arch)) {
		dump_backtrace_thread(output_fd, &unwinder, thread);
		} else {
		async_safe_format_log(ANDROID_LOG_ERROR, "libc", "Unable to init unwinder.");
		}
		}
		__linker_disable_fallback_allocator();
		}

debuggerd/libdebuggerd/backtrace.cpp

+11 −9

Original line number	Diff line number	Diff line
		@@ -35,8 +35,8 @@
		#include <string>

		#include <android-base/unique_fd.h>
		#include <backtrace/Backtrace.h>
		#include <log/log.h>
		#include <unwindstack/Unwinder.h>

		#include "libdebuggerd/types.h"
		#include "libdebuggerd/utility.h"
		@@ -59,25 +59,27 @@ static void dump_process_footer(log_t* log, pid_t pid) {
		_LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
		}

		void dump_backtrace_thread(int output_fd, BacktraceMap* map, const ThreadInfo& thread) {
		void dump_backtrace_thread(int output_fd, unwindstack::Unwinder* unwinder,
		const ThreadInfo& thread) {
		log_t log;
		log.tfd = output_fd;
		log.amfd_data = nullptr;

		_LOG(&log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread.thread_name.c_str(), thread.tid);

		std::vector<backtrace_frame_data_t> frames;
		if (!Backtrace::Unwind(thread.registers.get(), map, &frames, 0, nullptr)) {
		unwinder->SetRegs(thread.registers.get());
		unwinder->Unwind();
		if (unwinder->NumFrames() == 0) {
		_LOG(&log, logtype::THREAD, "Unwind failed: tid = %d", thread.tid);
		return;
		}

		for (auto& frame : frames) {
		_LOG(&log, logtype::BACKTRACE, " %s\n", Backtrace::FormatFrameData(&frame).c_str());
		for (size_t i = 0; i < unwinder->NumFrames(); i++) {
		_LOG(&log, logtype::BACKTRACE, " %s\n", unwinder->FormatFrame(i).c_str());
		}
		}

		void dump_backtrace(android::base::unique_fd output_fd, BacktraceMap* map,
		void dump_backtrace(android::base::unique_fd output_fd, unwindstack::Unwinder* unwinder,
		const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) {
		log_t log;
		log.tfd = output_fd.get();
		@@ -91,10 +93,10 @@ void dump_backtrace(android::base::unique_fd output_fd, BacktraceMap* map,

		dump_process_header(&log, target->second.pid, target->second.process_name.c_str());

		dump_backtrace_thread(output_fd.get(), map, target->second);
		dump_backtrace_thread(output_fd.get(), unwinder, target->second);
		for (const auto& [tid, info] : thread_info) {
		if (tid != target_thread) {
		dump_backtrace_thread(output_fd.get(), map, info);
		dump_backtrace_thread(output_fd.get(), unwinder, info);
		}
		}

debuggerd/libdebuggerd/elf_utils.cpp

deleted100644 → 0

+0 −121

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2015 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#define LOG_TAG "DEBUG"

		#include "libdebuggerd/elf_utils.h"

		#include <elf.h>
		#include <stdint.h>
		#include <stdlib.h>
		#include <string.h>

		#include <string>

		#include <android-base/stringprintf.h>
		#include <log/log.h>
		#include <unwindstack/Memory.h>

		#define NOTE_ALIGN(size) (((size) + 3) & ~3)

		template <typename HdrType, typename PhdrType, typename NhdrType>
		static bool get_build_id(unwindstack::Memory* memory, uintptr_t base_addr, uint8_t* e_ident,
		std::string* build_id) {
		HdrType hdr;

		memcpy(&hdr.e_ident[0], e_ident, EI_NIDENT);

		// First read the rest of the header.
		if (memory->Read(base_addr + EI_NIDENT, reinterpret_cast<uint8_t*>(&hdr) + EI_NIDENT,
		sizeof(HdrType) - EI_NIDENT) != sizeof(HdrType) - EI_NIDENT) {
		return false;
		}

		for (size_t i = 0; i < hdr.e_phnum; i++) {
		PhdrType phdr;
		if (memory->Read(base_addr + hdr.e_phoff + i * hdr.e_phentsize,
		reinterpret_cast<uint8_t*>(&phdr), sizeof(phdr)) != sizeof(phdr)) {
		return false;
		}
		// Looking for the .note.gnu.build-id note.
		if (phdr.p_type == PT_NOTE) {
		size_t hdr_size = phdr.p_filesz;
		uintptr_t addr = base_addr + phdr.p_offset;
		while (hdr_size >= sizeof(NhdrType)) {
		NhdrType nhdr;
		if (memory->Read(addr, reinterpret_cast<uint8_t*>(&nhdr), sizeof(nhdr)) != sizeof(nhdr)) {
		return false;
		}
		addr += sizeof(nhdr);
		if (nhdr.n_type == NT_GNU_BUILD_ID) {
		// Skip the name (which is the owner and should be "GNU").
		addr += NOTE_ALIGN(nhdr.n_namesz);
		uint8_t build_id_data[160];
		if (nhdr.n_descsz > sizeof(build_id_data)) {
		ALOGE("Possible corrupted note, desc size value is too large: %u",
		nhdr.n_descsz);
		return false;
		}
		if (memory->Read(addr, build_id_data, nhdr.n_descsz) != nhdr.n_descsz) {
		return false;
		}

		build_id->clear();
		for (size_t bytes = 0; bytes < nhdr.n_descsz; bytes++) {
		*build_id += android::base::StringPrintf("%02x", build_id_data[bytes]);
		}

		return true;
		} else {
		// Move past the extra note data.
		hdr_size -= sizeof(nhdr);
		size_t skip_bytes = NOTE_ALIGN(nhdr.n_namesz) + NOTE_ALIGN(nhdr.n_descsz);
		addr += skip_bytes;
		if (hdr_size < skip_bytes) {
		break;
		}
		hdr_size -= skip_bytes;
		}
		}
		}
		}
		return false;
		}

		bool elf_get_build_id(unwindstack::Memory* memory, uintptr_t addr, std::string* build_id) {
		// Read and verify the elf magic number first.
		uint8_t e_ident[EI_NIDENT];
		if (memory->Read(addr, e_ident, SELFMAG) != SELFMAG) {
		return false;
		}

		if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
		return false;
		}

		// Read the rest of EI_NIDENT.
		if (memory->Read(addr + SELFMAG, e_ident + SELFMAG, EI_NIDENT - SELFMAG) != EI_NIDENT - SELFMAG) {
		return false;
		}

		if (e_ident[EI_CLASS] == ELFCLASS32) {
		return get_build_id<Elf32_Ehdr, Elf32_Phdr, Elf32_Nhdr>(memory, addr, e_ident, build_id);
		} else if (e_ident[EI_CLASS] == ELFCLASS64) {
		return get_build_id<Elf64_Ehdr, Elf64_Phdr, Elf64_Nhdr>(memory, addr, e_ident, build_id);
		}

		return false;
		}