From d1d2f43223bcda062d10c8e68776590956892f71 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Fri, 10 Jun 2022 22:11:44 +0100
Subject: [PATCH] tests: Add a regression test for LUKS zeroing crash

https://listman.redhat.com/archives/libguestfs/2022-June/029188.html
(cherry picked from commit 7ab2ef96803bfc385f786be82ebfdd4cc977d504)
---
 tests/Makefile.am            |  2 ++
 tests/test-luks-copy-zero.sh | 70 ++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100755 tests/test-luks-copy-zero.sh

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 799aa6c2..0f4b0746 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1601,11 +1601,13 @@ if HAVE_GNUTLS_PBKDF2
 TESTS += \
 	test-luks-info.sh \
 	test-luks-copy.sh \
+	test-luks-copy-zero.sh \
 	$(NULL)
 endif
 EXTRA_DIST += \
 	test-luks-info.sh \
 	test-luks-copy.sh \
+	test-luks-copy-zero.sh \
 	$(NULL)
 
 # multi-conn filter test.
diff --git a/tests/test-luks-copy-zero.sh b/tests/test-luks-copy-zero.sh
new file mode 100755
index 00000000..6ff560e3
--- /dev/null
+++ b/tests/test-luks-copy-zero.sh
@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+# nbdkit
+# Copyright (C) 2018-2022 Red Hat Inc.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# * 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.
+#
+# * Neither the name of Red Hat nor the names of its contributors may be
+# used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''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 RED HAT OR
+# CONTRIBUTORS 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.
+
+# Regression test for:
+# https://listman.redhat.com/archives/libguestfs/2022-June/029188.html
+
+source ./functions.sh
+set -e
+set -x
+
+requires qemu-img --version
+requires nbdcopy --version
+requires truncate --version
+requires file --version
+requires_filter luks
+
+encrypt_disk=luks-copy-zero1.img
+zero_disk=luks-copy-zero2.img
+cleanup_fn rm -f $encrypt_disk $zero_disk
+rm -f $encrypt_disk $zero_disk
+
+# Create an empty encrypted disk container.
+qemu-img create -f luks \
+         --object secret,data=123456,id=sec0 \
+         -o key-secret=sec0 \
+         $encrypt_disk 100M
+
+# Create an all zeroes disk of the same size.
+truncate -s 100M $zero_disk
+
+# Using nbdkit-luks-filter, write the zero disk into the encrypted
+# disk.  nbdcopy will do this using NBD_CMD_ZERO operations.
+nbdkit -U - -fv \
+       file $encrypt_disk --filter=luks passphrase=123456 \
+       --run "nbdcopy -C 1 $zero_disk \$nbd"
+
+# Check that the encrypted disk is still a LUKS disk.  If zeroing is
+# wrong in the filter it's possible that it writes through to the
+# underlying disk, erasing the container.
+file $encrypt_disk
+file $encrypt_disk | grep "LUKS encrypted file"
-- 
2.31.1