Verify reading of a GNU tar posix archive with 8GB member

POSIX says that we have to ignore the ustar size field when there's a size specified in the pax extension header. This bug wasn't caught earlier because libarchive always puts a correct size in both places, so the failure to ignore the ustar size made no difference. GNU tar follows the POSIX spec a little more strictly, which triggers this bug. Verifies our fix for libarchive#2404.
kientzle · Nov 3, 2024 · 7c4407e · 7c4407e
1 parent 7b6950d
commit 7c4407e
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diff --git a/Makefile.am b/Makefile.am
@@ -411,6 +411,7 @@ libarchive_test_SOURCES= \
 	libarchive/test/test_compat_bzip2.c \
 	libarchive/test/test_compat_cpio.c \
 	libarchive/test/test_compat_gtar.c \
+	libarchive/test/test_compat_gtar_large.c \
 	libarchive/test/test_compat_gzip.c \
 	libarchive/test/test_compat_lz4.c \
 	libarchive/test/test_compat_lzip.c \

diff --git a/libarchive/test/CMakeLists.txt b/libarchive/test/CMakeLists.txt
@@ -55,6 +55,7 @@ IF(ENABLE_TEST)
     test_compat_bzip2.c
     test_compat_cpio.c
     test_compat_gtar.c
+    test_compat_gtar_large.c
     test_compat_gzip.c
     test_compat_lz4.c
     test_compat_lzip.c
@@ -129,6 +130,7 @@ IF(ENABLE_TEST)
     test_read_format_cpio_svr4_gzip_rpm.c
     test_read_format_cpio_svr4c_Z.c
     test_read_format_empty.c
+    test_read_format_gnutar_old_sparse.c
     test_read_format_gtar_filename.c
     test_read_format_gtar_gz.c
     test_read_format_gtar_lzma.c

diff --git a/libarchive/test/test_compat_gtar_large.c b/libarchive/test/test_compat_gtar_large.c
@@ -0,0 +1,224 @@
+/*-
+ * Copyright (c) 2003-2024 Tim Kientzle
+ * 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"
+
+/*
+ * Verify reading a GNU tar pax format archive with >8GB entry.
+ *
+ * Sample data created with GNU tar 1.35:
+ * $ dd if=/dev/zero of=test.bin bs=1048576 count=8192
+ * $ gnutar --format=posix -cvf test.tar test.bin
+ * $ hexdump -C -v test.tar | head -n 96
+ */
+
+static const unsigned char test_compat_gtar_large_data[] = {
+  /* 00000000 */   0x2e, 0x2f, 0x50, 0x61, 0x78, 0x48, 0x65, 0x61, 0x64, 0x65, 0x72, 0x73, 0x2f, 0x74, 0x65, 0x73,  /* |./PaxHeaders/tes| */
+  /* 00000010 */   0x74, 0x2e, 0x62, 0x69, 0x6e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |t.bin...........| */
+  /* 00000020 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000030 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000040 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000050 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000060 */   0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x30, 0x30, 0x36, 0x34, 0x34, 0x00, 0x30, 0x30, 0x30, 0x30,  /* |....0000644.0000| */
+  /* 00000070 */   0x30, 0x30, 0x30, 0x00, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x30, 0x30, 0x30, 0x30,  /* |000.0000000.0000| */
+  /* 00000080 */   0x30, 0x30, 0x30, 0x30, 0x31, 0x35, 0x35, 0x00, 0x31, 0x34, 0x37, 0x31, 0x31, 0x35, 0x36, 0x36,  /* |0000155.14711566| */
+  /* 00000090 */   0x30, 0x31, 0x33, 0x00, 0x30, 0x31, 0x31, 0x37, 0x35, 0x33, 0x00, 0x20, 0x78, 0x00, 0x00, 0x00,  /* |013.011753. x...| */
+  /* 000000a0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000000b0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000000c0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000000d0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000000e0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000000f0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000100 */   0x00, 0x75, 0x73, 0x74, 0x61, 0x72, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |.ustar.00.......| */
+  /* 00000110 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000120 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000130 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000140 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000150 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000160 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000170 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000180 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000190 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000001a0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000001b0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000001c0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000001d0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000001e0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000001f0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000200 */   0x31, 0x39, 0x20, 0x73, 0x69, 0x7a, 0x65, 0x3d, 0x38, 0x35, 0x38, 0x39, 0x39, 0x33, 0x34, 0x35,  /* |19 size=85899345| */
+  /* 00000210 */   0x39, 0x32, 0x0a, 0x33, 0x30, 0x20, 0x6d, 0x74, 0x69, 0x6d, 0x65, 0x3d, 0x31, 0x37, 0x33, 0x30,  /* |92.30 mtime=1730| */
+  /* 00000220 */   0x36, 0x30, 0x34, 0x30, 0x34, 0x33, 0x2e, 0x30, 0x34, 0x36, 0x38, 0x33, 0x33, 0x30, 0x31, 0x31,  /* |604043.046833011| */
+  /* 00000230 */   0x0a, 0x33, 0x30, 0x20, 0x61, 0x74, 0x69, 0x6d, 0x65, 0x3d, 0x31, 0x37, 0x33, 0x30, 0x36, 0x30,  /* |.30 atime=173060| */
+  /* 00000240 */   0x34, 0x30, 0x33, 0x39, 0x2e, 0x38, 0x30, 0x37, 0x30, 0x38, 0x31, 0x33, 0x31, 0x39, 0x0a, 0x33,  /* |4039.807081319.3| */
+  /* 00000250 */   0x30, 0x20, 0x63, 0x74, 0x69, 0x6d, 0x65, 0x3d, 0x31, 0x37, 0x33, 0x30, 0x36, 0x30, 0x34, 0x30,  /* |0 ctime=17306040| */
+  /* 00000260 */   0x34, 0x33, 0x2e, 0x30, 0x34, 0x36, 0x38, 0x33, 0x33, 0x30, 0x31, 0x31, 0x0a, 0x00, 0x00, 0x00,  /* |43.046833011....| */
+  /* 00000270 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000280 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000290 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000002a0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000002b0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000002c0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000002d0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000002e0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000002f0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000300 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000310 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000320 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000330 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000340 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000350 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000360 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000370 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000380 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000390 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000003a0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000003b0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000003c0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000003d0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000003e0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000003f0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000400 */   0x74, 0x65, 0x73, 0x74, 0x2e, 0x62, 0x69, 0x6e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |test.bin........| */
+  /* 00000410 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000420 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000430 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000440 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000450 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000460 */   0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x30, 0x30, 0x36, 0x34, 0x34, 0x00, 0x30, 0x30, 0x30, 0x30,  /* |....0000644.0000| */
+  /* 00000470 */   0x37, 0x36, 0x35, 0x00, 0x30, 0x30, 0x30, 0x30, 0x30, 0x32, 0x34, 0x00, 0x30, 0x30, 0x30, 0x30,  /* |765.0000024.0000| */
+  /* 00000480 */   0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x31, 0x34, 0x37, 0x31, 0x31, 0x35, 0x36, 0x36,  /* |0000000.14711566| */
+  /* 00000490 */   0x30, 0x31, 0x33, 0x00, 0x30, 0x31, 0x31, 0x32, 0x33, 0x35, 0x00, 0x20, 0x30, 0x00, 0x00, 0x00,  /* |013.011235. 0...| */
+  /* 000004a0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000004b0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000004c0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000004d0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000004e0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000004f0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000500 */   0x00, 0x75, 0x73, 0x74, 0x61, 0x72, 0x00, 0x30, 0x30, 0x74, 0x69, 0x6d, 0x00, 0x00, 0x00, 0x00,  /* |.ustar.00tim....| */
+  /* 00000510 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000520 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73, 0x74, 0x61, 0x66, 0x66, 0x00, 0x00,  /* |.........staff..| */
+  /* 00000530 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000540 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000550 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000560 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000570 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000580 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 00000590 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000005a0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000005b0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000005c0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000005d0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000005e0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+  /* 000005f0 */   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* |................| */
+};
+
+/*
+ * Followed by 16777218 blocks, each consisting of 512 zeros:
+ * Entry is 8GB = 2^24 = 16777216 blocks
+ * Plus 2 zero blocks for end-of-archive
+ */
+
+struct my_reader {
+	const unsigned char *prefix;
+	int prefix_length;
+	int zero_blocks_remaining;
+	char *zero_block;
+};
+
+/*
+ * Custom reader returns first the prefix, then
+ * the expected number of zero blocks, then EOF.
+ */
+static ssize_t
+myread(struct archive *a, void *client_data, const void **buff)
+{
+  struct my_reader *reader = client_data;
+  (void)a; /* UNUSED */
+
+  if (reader->prefix != NULL) {
+	  *buff = reader->prefix;
+	  reader->prefix = NULL;
+	  return reader->prefix_length;
+  } else if (reader->zero_blocks_remaining > 0) {
+	  *buff = reader->zero_block;
+	  reader->zero_blocks_remaining -= 1;
+	  return 512;
+  } else {
+	  return 0;
+  }
+}
+
+/*
+ * test_compat_gtar_large verifies that we can read
+ * the archive encoded above.
+ */
+DEFINE_TEST(test_compat_gtar_large)
+{
+	struct archive *a;
+	struct archive_entry *ae;
+	struct my_reader reader = {
+		test_compat_gtar_large_data,
+		sizeof(test_compat_gtar_large_data),
+		16777218, /* 2^24 + 2 ; See above */
+		NULL
+	};
+	int r;
+
+	reader.zero_block = malloc(512);
+
+	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));
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_open(a, &reader, NULL, myread, NULL));
+
+	/* Read first entry. */
+	assertEqualIntA(a, ARCHIVE_OK, r = archive_read_next_header(a, &ae));
+	if (r != ARCHIVE_OK) {
+		archive_read_free(a);
+		return;
+	}
+	assertEqualString("test.bin", archive_entry_pathname(ae));
+	assertEqualInt(1730604043, archive_entry_mtime(ae));
+	assertEqualInt(501, archive_entry_uid(ae));
+	assertEqualString("tim", archive_entry_uname(ae));
+	assertEqualInt(20, archive_entry_gid(ae));
+	assertEqualString("staff", archive_entry_gname(ae));
+	assertEqualInt(0100644, archive_entry_mode(ae));
+	assertEqualInt(8589934592LL, archive_entry_size(ae));
+
+	/* TODO: Read and verify contents: 8GB of zeros */
+
+	/* Verify the end-of-archive. */
+	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_PAX_INTERCHANGE);
+
+	/* Verify that the reader actually read to the end of data */
+	assertEqualInt(reader.zero_blocks_remaining, 0);
+
+	assertEqualInt(ARCHIVE_OK, archive_read_close(a));
+	assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+	free(reader.zero_block);
+}