From: Martin Matuska Date: Sat, 18 May 2019 08:19:19 +0000 (+0200) Subject: tar reader: treat empty archives with a GNU volume header as valid X-Git-Tag: v3.4.0~21 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2bdae161dc2671309abaaadad097f4bccc94b937;p=thirdparty%2Flibarchive.git tar reader: treat empty archives with a GNU volume header as valid Fixes #1062 --- diff --git a/Makefile.am b/Makefile.am index 8bd821cbd..932a5a894 100644 --- a/Makefile.am +++ b/Makefile.am @@ -502,6 +502,7 @@ libarchive_test_SOURCES= \ libarchive/test/test_read_format_tar_concatenated.c \ libarchive/test/test_read_format_tar_empty_pax.c \ libarchive/test/test_read_format_tar_empty_filename.c \ + libarchive/test/test_read_format_tar_empty_with_gnulabel.c \ libarchive/test/test_read_format_tar_filename.c \ libarchive/test/test_read_format_tbz.c \ libarchive/test/test_read_format_tgz.c \ @@ -867,6 +868,7 @@ libarchive_test_EXTRA_DIST=\ libarchive/test/test_read_format_raw.data.uu \ libarchive/test/test_read_format_tar_concatenated.tar.uu \ libarchive/test/test_read_format_tar_empty_filename.tar.uu \ + libarchive/test/test_read_format_tar_empty_with_gnulabel.tar.uu \ libarchive/test/test_read_format_tar_empty_pax.tar.Z.uu \ libarchive/test/test_read_format_tar_filename_koi8r.tar.Z.uu \ libarchive/test/test_read_format_ustar_filename_cp866.tar.Z.uu \ diff --git a/libarchive/archive_read_support_format_tar.c b/libarchive/archive_read_support_format_tar.c index 81c03c885..c63d46fc0 100644 --- a/libarchive/archive_read_support_format_tar.c +++ b/libarchive/archive_read_support_format_tar.c @@ -694,11 +694,13 @@ tar_read_header(struct archive_read *a, struct tar *tar, struct archive_entry *entry, size_t *unconsumed) { ssize_t bytes; - int err; + int err, eof_vol_header; const char *h; const struct archive_entry_header_ustar *header; const struct archive_entry_header_gnutar *gnuheader; + eof_vol_header = 0; + /* Loop until we find a workable header record. */ for (;;) { tar_flush_unconsumed(a, unconsumed); @@ -788,6 +790,8 @@ tar_read_header(struct archive_read *a, struct tar *tar, break; case 'V': /* GNU volume header */ err = header_volume(a, tar, entry, h, unconsumed); + if (err == ARCHIVE_EOF) + eof_vol_header = 1; break; case 'X': /* Used by SUN tar; same as 'x'. */ a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; @@ -862,9 +866,17 @@ tar_read_header(struct archive_read *a, struct tar *tar, } return (err); } - if (err == ARCHIVE_EOF) - /* EOF when recursively reading a header is bad. */ - archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); + if (err == ARCHIVE_EOF) { + if (!eof_vol_header) { + /* EOF when recursively reading a header is bad. */ + archive_set_error(&a->archive, EINVAL, + "Damaged tar archive"); + } else { + /* If we encounter just a GNU volume header treat + * this situation as an empty archive */ + return (ARCHIVE_EOF); + } + } return (ARCHIVE_FATAL); } diff --git a/libarchive/test/CMakeLists.txt b/libarchive/test/CMakeLists.txt index c6c95aa56..80452b654 100644 --- a/libarchive/test/CMakeLists.txt +++ b/libarchive/test/CMakeLists.txt @@ -154,6 +154,7 @@ IF(ENABLE_TEST) test_read_format_tar.c test_read_format_tar_concatenated.c test_read_format_tar_empty_filename.c + test_read_format_tar_empty_with_gnulabel.c test_read_format_tar_empty_pax.c test_read_format_tar_filename.c test_read_format_tbz.c diff --git a/libarchive/test/test_read_format_tar_empty_with_gnulabel.c b/libarchive/test/test_read_format_tar_empty_with_gnulabel.c new file mode 100644 index 000000000..83f20bb97 --- /dev/null +++ b/libarchive/test/test_read_format_tar_empty_with_gnulabel.c @@ -0,0 +1,53 @@ +/*- + * Copyright (c) 2019 Martin Matuska + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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. + */ +#include "test.h" +__FBSDID("$FreeBSD$"); + +/* + * Tar archives with with just a GNU label (or ending with one) should + * be treated as valid (empty) archives + */ +DEFINE_TEST(test_read_format_tar_empty_with_gnulabel) +{ + char name[] = "test_read_format_tar_empty_with_gnulabel.tar"; + struct archive_entry *ae; + struct archive *a; + + assert((a = archive_read_new()) != NULL); + assertEqualIntA(a, ARCHIVE_OK, archive_read_support_filter_all(a)); + assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_all(a)); + extract_reference_file(name); + assertEqualIntA(a, ARCHIVE_OK, archive_read_open_filename(a, name, 10240)); + + /* Read first entry. */ + assertEqualIntA(a, ARCHIVE_EOF, archive_read_next_header(a, &ae)); + + /* Verify that the format detection worked. */ + assertEqualInt(archive_filter_code(a, 0), ARCHIVE_FILTER_NONE); + assertEqualInt(archive_format(a), ARCHIVE_FORMAT_TAR); + + assertEqualInt(ARCHIVE_OK, archive_read_close(a)); + assertEqualInt(ARCHIVE_OK, archive_read_free(a)); +} diff 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