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Edit File: kernel_crashdump

#!/usr/bin/python3
#
# Collect information about a kernel oops.
#
# 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.

import os, re, glob
import apport, 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(vmcore_path + '.log'):
    try:
        log_fd = os.open(vmcore_path + '.log', os.O_RDONLY | os.O_NOFOLLOW)
        pr['VmCoreLog'] = (os.fdopen(log_fd, 'rb'),)
        os.unlink(vmcore_path + '.log')
    except OSError as e:
        apport.fatal('Cannot open vmcore log: ' + str(e))

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 (IOError, OSError) as e:
        apport.fatal('Cannot create report: ' + str(e))

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 = 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'),)
                # TODO: Replace with open(..., 'xb') once we drop Python 2 support
                with os.fdopen(os.open(crash_report, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o640), 'wb') as f:
                    pr.write(f)
            except (IOError, OSError) as e:
                apport.fatal('Cannot create report: ' + str(e))