generic: test using fs-verity and fscrypt simultaneously

This primarily verifies correct ordering of the hooks for each feature:
fscrypt needs to be first.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/generic/576

@@ -0,0 +1,80 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2018 Google LLC
+#
+# FS QA Test generic/576
+#
+# Test using fs-verity and fscrypt simultaneously.  This primarily verifies
+# correct ordering of the hooks for each feature: fscrypt needs to be first.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/verity
+. ./common/encrypt
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_scratch_verity
+_require_scratch_encryption
+_require_command "$KEYCTL_PROG" keyctl
+
+_scratch_mkfs_encrypted_verity &>> $seqres.full
+_scratch_mount
+
+fsv_orig_file=$tmp.file
+edir=$SCRATCH_MNT/edir
+fsv_file=$edir/file.fsv
+
+# Set up an encrypted directory.
+_new_session_keyring
+keydesc=$(_generate_encryption_key)
+mkdir $edir
+_set_encpolicy $edir $keydesc
+
+# Create a file within the encrypted directory and enable verity on it.
+# Then check that it has an encryption policy as well.
+head -c 100000 /dev/zero > $fsv_orig_file
+cp $fsv_orig_file $fsv_file
+_fsv_enable $fsv_file
+echo
+$XFS_IO_PROG -r -c "get_encpolicy" $fsv_file | _filter_scratch \
+	| sed 's/Master key descriptor:.*/Master key descriptor: 0000000000000000/'
+echo
+
+# Verify that the file contents are as expected.  This should be going through
+# both the decryption and verity I/O paths.
+cmp $fsv_orig_file $fsv_file && echo "Files matched"
+
+# Just in case, try again after a mount cycle to empty the page cache.
+_scratch_cycle_mount
+cmp $fsv_orig_file $fsv_file && echo "Files matched"
+
+# Corrupt some bytes as a sanity check that fs-verity is really working.
+# This also verifies that the data on-disk is really encrypted, since otherwise
+# the data being written here would be identical to the old data.
+head -c 1000 /dev/zero | _fsv_scratch_corrupt_bytes $fsv_file 50000
+md5sum $fsv_file |& _filter_scratch
+
+# success, all done
+status=0
+exit

tests/generic/576.out

@@ -0,0 +1,12 @@
+QA output created by 576
+
+Encryption policy for SCRATCH_MNT/edir/file.fsv:
+	Policy version: 0
+	Master key descriptor: 0000000000000000
+	Contents encryption mode: 1 (AES-256-XTS)
+	Filenames encryption mode: 4 (AES-256-CTS)
+	Flags: 0x02
+
+Files matched
+Files matched
+md5sum: SCRATCH_MNT/edir/file.fsv: Input/output error

tests/generic/group

@@ -578,3 +578,4 @@
 573 auto quick verity
 574 auto quick verity
 575 auto quick verity
+576 auto quick verity encrypt