fdd861ef7e
Cgroup v2 paths are owned by libprocessgroup. Those paths can change based on build flags, so paths generated outside of libprocessgroup may not always be correct. Bug: 382693152 Test: adb shell debuggerd -b <pid> Change-Id: I7e486ab6f4068d0fae1be033a91b9a307f54ed42
111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
/*
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* Copyright 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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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits>
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#include <string_view>
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#include <thread>
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#include <android-base/logging.h>
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#include <android-base/parseint.h>
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#include <android-base/unique_fd.h>
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#include <debuggerd/client.h>
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#include <processgroup/processgroup.h>
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#include <procinfo/process.h>
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#include "util.h"
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using android::base::unique_fd;
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static void usage(int exit_code) {
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fprintf(stderr, "usage: debuggerd [-bj] PID\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "-b, --backtrace just a backtrace rather than a full tombstone\n");
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fprintf(stderr, "-j collect java traces\n");
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_exit(exit_code);
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}
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int main(int argc, char* argv[]) {
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if (argc <= 1) usage(0);
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if (argc > 3) usage(1);
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DebuggerdDumpType dump_type = kDebuggerdTombstone;
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if (argc == 3) {
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std::string_view flag = argv[1];
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if (flag == "-b" || flag == "--backtrace") {
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dump_type = kDebuggerdNativeBacktrace;
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} else if (flag == "-j") {
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dump_type = kDebuggerdJavaBacktrace;
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} else {
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usage(1);
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}
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}
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pid_t pid;
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if (!android::base::ParseInt(argv[argc - 1], &pid, 1, std::numeric_limits<pid_t>::max())) {
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usage(1);
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}
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if (getuid() != 0) {
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errx(1, "root is required");
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}
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// Check to see if the process exists and that we can actually send a signal to it.
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android::procinfo::ProcessInfo proc_info;
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if (!android::procinfo::GetProcessInfo(pid, &proc_info)) {
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err(1, "failed to fetch info for process %d", pid);
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}
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if (proc_info.state == android::procinfo::kProcessStateZombie) {
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errx(1, "process %d is a zombie", pid);
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}
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// Send a signal to the main thread pid, not a side thread. The signal
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// handler always sets the crashing tid to the main thread pid when sent this
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// signal. This is to avoid a problem where the signal is sent to a process,
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// but happens on a side thread and the intercept mismatches since it
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// is looking for the main thread pid, not the tid of this random thread.
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// See b/194346289 for extra details.
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if (kill(proc_info.pid, 0) != 0) {
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if (pid == proc_info.pid) {
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err(1, "cannot send signal to process %d", pid);
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} else {
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err(1, "cannot send signal to main thread %d (requested thread %d)", proc_info.pid, pid);
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}
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}
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// unfreeze if pid is frozen.
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SetProcessProfiles(proc_info.uid, proc_info.pid, {"Unfrozen"});
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// we don't restore the frozen state as this is considered a benign change.
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unique_fd output_fd(fcntl(STDOUT_FILENO, F_DUPFD_CLOEXEC, 0));
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if (output_fd.get() == -1) {
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err(1, "failed to fcntl dup stdout");
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}
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if (!debuggerd_trigger_dump(proc_info.pid, dump_type, 0, std::move(output_fd))) {
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if (pid == proc_info.pid) {
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errx(1, "failed to dump process %d", pid);
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} else {
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errx(1, "failed to dump main thread %d (requested thread %d)", proc_info.pid, pid);
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}
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}
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return 0;
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}
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