tar/tests/sptrdiff01.at

# Process this file with autom4te to create testsuite. -*- Autotest -*-
#
# Test suite for GNU tar.
# Copyright 2018-2023 Free Software Foundation, Inc.
#
# This file is part of GNU tar.
#
# GNU tar 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 3 of the License, or
# (at your option) any later version.
#
# GNU tar is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# While fixing CVE-2018-20482 (see sptrcreat.at) it has been discovered
# that similar bug exists in file checking code (tar d). 
# This test case checks if tar correctly handles a short read condition
# appearing in check_data_region.

AT_SETUP([file truncated in data region while comparing])
AT_KEYWORDS([truncate filechange sparse sptr sptrdiff diff])

# This triggers short read in check_data_region.
AT_TAR_CHECK([
genfile --sparse --block-size=1024 --file foo \
  0 ABCDEFGHIJ 1M ABCDEFGHIJ 10M ABCDEFGHIJ 200M ABCDEFGHIJ || AT_SKIP_TEST
genfile --file baz
echo creating
tar --sparse -vcf bar foo baz
echo comparing
genfile --run --checkpoint 5 --length 221278210 --truncate foo -- \
 tar --sparse -vdf bar 
],
[1],
[creating
foo
baz
comparing
foo
foo: Size differs
baz
],
[],
[],[],[posix, gnu, oldgnu])

AT_CLEANUP