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// Copyright 2020 Google LLC
//
// 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 LLC 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/path_helper.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",
google_breakpad::BaseName(argv0).c_str());
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;
}
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