| // Copyright (c) 2020, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // core_handler.cc: A tool to handle coredumps on Linux |
| |
| #include <pwd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/mman.h> |
| #include <sys/types.h> |
| #include <syslog.h> |
| #include <unistd.h> |
| #include <sstream> |
| |
| #include "client/linux/minidump_writer/linux_core_dumper.h" |
| #include "client/linux/minidump_writer/minidump_writer.h" |
| #include "common/scoped_ptr.h" |
| |
| namespace { |
| |
| using google_breakpad::AppMemoryList; |
| using google_breakpad::LinuxCoreDumper; |
| using google_breakpad::MappingList; |
| using google_breakpad::scoped_array; |
| |
| // Size of the core dump to read in order to access all the threads |
| // descriptions. |
| // |
| // The first section is the note0 section which contains the thread states. On |
| // x86-64 a typical thread description take about 1432B. Reading 1 MB allows |
| // several hundreds of threads. |
| const int core_read_size = 1024 * 1024; |
| |
| void ShowUsage(const char* argv0) { |
| fprintf(stderr, "Usage: %s <process id> <minidump file>\n\n", argv0); |
| fprintf(stderr, |
| "A tool which serves as a core dump handler and produces " |
| "minidump files.\n"); |
| fprintf(stderr, "Please refer to the online documentation:\n"); |
| fprintf(stderr, |
| "https://chromium.googlesource.com/breakpad/breakpad/+/HEAD" |
| "/docs/linux_core_handler.md\n"); |
| } |
| |
| bool WriteMinidumpFromCore(const char* filename, |
| const char* core_path, |
| const char* procfs_override) { |
| MappingList mappings; |
| AppMemoryList memory_list; |
| LinuxCoreDumper dumper(0, core_path, procfs_override); |
| return google_breakpad::WriteMinidump(filename, mappings, memory_list, |
| &dumper); |
| } |
| |
| bool HandleCrash(pid_t pid, const char* procfs_dir, const char* md_filename) { |
| int r = 0; |
| scoped_array<char> buf(new char[core_read_size]); |
| while (r != core_read_size) { |
| int ret = read(STDIN_FILENO, &buf[r], core_read_size - r); |
| if (ret == 0) { |
| break; |
| } else if (ret == -1) { |
| return false; |
| } |
| r += ret; |
| } |
| |
| int fd = memfd_create("core_file", MFD_CLOEXEC); |
| if (fd == -1) { |
| return false; |
| } |
| |
| int w = write(fd, &buf[0], r); |
| if (w != r) { |
| close(fd); |
| return false; |
| } |
| |
| std::stringstream core_file_ss; |
| core_file_ss << "/proc/self/fd/" << fd; |
| std::string core_file(core_file_ss.str()); |
| |
| if (!WriteMinidumpFromCore(md_filename, core_file.c_str(), procfs_dir)) { |
| close(fd); |
| return false; |
| } |
| close(fd); |
| |
| return true; |
| } |
| |
| } // namespace |
| |
| int main(int argc, char* argv[]) { |
| int ret = EXIT_FAILURE; |
| |
| if (argc != 3) { |
| ShowUsage(argv[0]); |
| return ret; |
| } |
| |
| const char* pid_str = argv[1]; |
| const char* md_filename = argv[2]; |
| pid_t pid = atoi(pid_str); |
| |
| std::stringstream proc_dir_ss; |
| proc_dir_ss << "/proc/" << pid_str; |
| std::string proc_dir(proc_dir_ss.str()); |
| |
| openlog("core_handler", 0, 0); |
| if (HandleCrash(pid, proc_dir.c_str(), md_filename)) { |
| syslog(LOG_NOTICE, "Minidump generated at %s\n", md_filename); |
| ret = EXIT_SUCCESS; |
| } else { |
| syslog(LOG_ERR, "Cannot generate minidump %s\n", md_filename); |
| } |
| closelog(); |
| |
| return ret; |
| } |