name : kernel_crashdump #!/usr/bin/python3 # # Copyright (c) 2007 Canonical Ltd. # Author: Martin Pitt <martin.pitt@ubuntu.com> # # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the # Free Software Foundation; either version 2 of the License, or (at your # option) any later version. See http://www.gnu.org/copyleft/gpl.html for # the full text of the license. """Collect information about a kernel oops.""" import glob import os import re import apport import apport.fileutils pr = apport.Report("KernelCrash") package = apport.packaging.get_kernel_package() pr.add_package(package) pr.add_os_info() vmcore_path = os.path.join(apport.fileutils.report_dir, "vmcore") # only accept plain files here, not symlinks; otherwise we might recursively # include the report, or similar DoS attacks if os.path.exists(f"{vmcore_path}.log"): try: log_fd = os.open(f"{vmcore_path}.log", os.O_RDONLY | os.O_NOFOLLOW) pr["VmCoreLog"] = (os.fdopen(log_fd, "rb"),) os.unlink(f"{vmcore_path}.log") except OSError as error: apport.fatal("Cannot open vmcore log: %s", str(error)) if os.path.exists(vmcore_path): try: core_fd = os.open(vmcore_path, os.O_RDONLY | os.O_NOFOLLOW) pr["VmCore"] = (os.fdopen(core_fd, "rb"),) with apport.fileutils.make_report_file(pr) as f: pr.write(f) except OSError as error: apport.fatal("Cannot create report: %s", str(error)) try: os.unlink(vmcore_path) except OSError: pass # huh, already gone? else: # check for kdump-tools generated dmesg in timestamped dir for dmesg_file in glob.glob( os.path.join(apport.fileutils.report_dir, "*", "dmesg.*") ): timedir = os.path.dirname(dmesg_file) timestamp = os.path.basename(timedir) if re.match("^[0-9]{12}$", timestamp): # we require the containing dir to be owned by root, to avoid users # creating a symlink to someplace else and disclosing data; we just # compare against euid here so that we can test this as non-root if os.lstat(timedir).st_uid != os.geteuid(): apport.fatal("%s has unsafe permissions, ignoring", timedir) report_name = f"{package}-{timestamp}.crash" try: crash_report = os.path.join(apport.fileutils.report_dir, report_name) dmesg_fd = os.open(dmesg_file, os.O_RDONLY | os.O_NOFOLLOW) pr["VmCoreDmesg"] = (os.fdopen(dmesg_fd, "rb"),) with open(crash_report, "xb") as f: pr.write(f) except OSError as error: apport.fatal("Cannot create report: %s", str(error))