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#!/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))