1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* Copyright (C) 2012-2014 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/tombstone.h"
#include <errno.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <android-base/file.h>
#include <android-base/unique_fd.h>
#include <android/log.h>
#include <async_safe/log.h>
#include <log/log.h>
#include <private/android_filesystem_config.h>
#include <unwindstack/Memory.h>
#include <unwindstack/Regs.h>
#include <unwindstack/Unwinder.h>
#include "libdebuggerd/backtrace.h"
#include "libdebuggerd/open_files_list.h"
#include "libdebuggerd/utility.h"
#include "util.h"
#include "tombstone.pb.h"
using android::base::unique_fd;
using namespace std::literals::string_literals;
void engrave_tombstone_ucontext(int tombstone_fd, int proto_fd, uint64_t abort_msg_address,
siginfo_t* siginfo, ucontext_t* ucontext) {
pid_t uid = getuid();
pid_t pid = getpid();
pid_t tid = gettid();
log_t log;
log.current_tid = tid;
log.crashed_tid = tid;
log.tfd = tombstone_fd;
log.amfd_data = nullptr;
std::string thread_name = get_thread_name(tid);
std::vector<std::string> command_line = get_command_line(pid);
std::unique_ptr<unwindstack::Regs> regs(
unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), ucontext));
std::string selinux_label;
android::base::ReadFileToString("/proc/self/attr/current", &selinux_label);
std::map<pid_t, ThreadInfo> threads;
threads[tid] = ThreadInfo{
.registers = std::move(regs), .uid = uid, .tid = tid, .thread_name = std::move(thread_name),
.pid = pid, .command_line = std::move(command_line), .selinux_label = std::move(selinux_label),
.siginfo = siginfo,
#if defined(__aarch64__)
// Only supported on aarch64 for now.
.tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0),
.pac_enabled_keys = prctl(PR_PAC_GET_ENABLED_KEYS, 0, 0, 0, 0),
#endif
};
if (pid == tid) {
const ThreadInfo& thread = threads[pid];
if (!iterate_tids(pid, [&threads, &thread](pid_t tid) {
threads[tid] = ThreadInfo{
.uid = thread.uid,
.tid = tid,
.pid = thread.pid,
.command_line = thread.command_line,
.thread_name = get_thread_name(tid),
.tagged_addr_ctrl = thread.tagged_addr_ctrl,
.pac_enabled_keys = thread.pac_enabled_keys,
};
})) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to open /proc/%d/task: %s", pid,
strerror(errno));
}
}
auto process_memory =
unwindstack::Memory::CreateProcessMemoryCached(getpid());
unwindstack::UnwinderFromPid unwinder(kMaxFrames, pid, unwindstack::Regs::CurrentArch(), nullptr,
process_memory);
if (!unwinder.Init()) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to init unwinder object");
return;
}
ProcessInfo process_info;
process_info.abort_msg_address = abort_msg_address;
engrave_tombstone(unique_fd(dup(tombstone_fd)), unique_fd(dup(proto_fd)), &unwinder, threads, tid,
process_info, nullptr, nullptr);
}
void engrave_tombstone(unique_fd output_fd, unique_fd proto_fd, unwindstack::Unwinder* unwinder,
const std::map<pid_t, ThreadInfo>& threads, pid_t target_thread,
const ProcessInfo& process_info, OpenFilesList* open_files,
std::string* amfd_data) {
// Don't copy log messages to tombstone unless this is a development device.
Tombstone tombstone;
engrave_tombstone_proto(&tombstone, unwinder, threads, target_thread, process_info, open_files);
if (proto_fd != -1) {
if (!tombstone.SerializeToFileDescriptor(proto_fd.get())) {
async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG, "failed to write proto tombstone: %s",
strerror(errno));
}
}
log_t log;
log.current_tid = target_thread;
log.crashed_tid = target_thread;
log.tfd = output_fd.get();
log.amfd_data = amfd_data;
tombstone_proto_to_text(tombstone, [&log](const std::string& line, bool should_log) {
_LOG(&log, should_log ? logtype::HEADER : logtype::LOGS, "%s\n", line.c_str());
});
}
|
