[PATCH 5/7] generic: test corrupting verity files

Eric Biggers
2018-12-10T22:25:50Z

From: Eric Biggers <ebiggers@google.com>

This test zaps various parts of the contents of a verity file, or parts
of its Merkle tree, by writing directly to the block device. It
verifies that this causes I/O errors when the relevant part of the
contents is later read by any means.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
tests/generic/903 | 126 ++++++++++++++++++++++++++++++++++++++++++
tests/generic/903.out | 91 ++++++++++++++++++++++++++++++
tests/generic/group | 1 +
3 files changed, 218 insertions(+)
create mode 100755 tests/generic/903
create mode 100644 tests/generic/903.out

diff --git a/tests/generic/903 b/tests/generic/903
new file mode 100755
index 00000000..8176d6e0
--- /dev/null
+++ b/tests/generic/903
@@ -0,0 +1,126 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright 2018 Google LLC
+#
+# FS QA Test generic/903
+#
+# Test corrupting verity files. This test zaps various parts of the contents of
+# a verity file, or parts of its Merkle tree, by writing directly to the block
+# device. It verifies that this causes I/O errors when the relevant part of the
+# contents is later read by any means.
+#
+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
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_scratch_verity
+
+_scratch_mkfs_verity &>> $seqres.full
+_scratch_mount
+fsv_orig_file=$SCRATCH_MNT/file
+fsv_file=$SCRATCH_MNT/file.fsv
+
+setup_zeroed_file()
+{
+ local len=$1
+
+ head -c $len /dev/zero > $fsv_orig_file
+ _fsv_setup $fsv_orig_file $fsv_file >> $seqres.full
+ _fsv_enable $fsv_file
+ md5sum $fsv_file |& _filter_scratch 1>&2
+}
+
+filter_sigbus()
+{
+ sed -e 's/.*Bus error.*/Bus error/'
+}
+
+page_boundary()
+{
+ local n=$1
+ local page_size=$(getconf PAGE_SIZE)
+
+ echo $(( (n + page_size - 1) & ~(page_size - 1) ))
+}
+
+corruption_test()
+{
+ local file_len=$1
+ local zap_offset=$2
+ local zap_len=$3
+ local metadata_offset=$(page_boundary $file_len)
+ local measurement
+
+ _fsv_begin_subtest "Corruption test: file_len=$file_len zap_offset=$zap_offset zap_len=$zap_len"
+ setup_zeroed_file $file_len
+ cmp $fsv_file $fsv_orig_file
+ echo "Corrupting bytes..."
+ head -c $zap_len /dev/zero | tr '\0' X \
+ | _fsv_corrupt_bytes $fsv_file $zap_offset
+
+ echo "Validating corruption (reading full file)..."
+ _scratch_cycle_mount
+ md5sum $fsv_file |& _filter_scratch
+
+ echo "Validating corruption (direct I/O)..."
+ _scratch_cycle_mount
+ dd if=$fsv_file bs=$FSV_BLOCK_SIZE iflag=direct status=none \
+ of=/dev/null |& _filter_scratch
+
+ if (( zap_offset < metadata_offset )); then
+ echo "Validating corruption (reading just corrupted part)..."
+ dd if=$fsv_file bs=1 skip=$zap_offset count=$zap_len \
+ of=/dev/null status=none |& _filter_scratch
+ fi
+
+ echo "Validating corruption (reading full file via mmap)..."
+ bash -c "trap '' SIGBUS; $XFS_IO_PROG -r $fsv_file \
+ -c 'mmap -r 0 $metadata_offset' \
+ -c 'mread 0 $file_len'" |& filter_sigbus
+
+ if (( zap_offset < metadata_offset )); then
+ echo "Validating corruption (reading just corrupted part via mmap)..."
+ bash -c "trap '' SIGBUS; $XFS_IO_PROG -r $fsv_file \
+ -c 'mmap -r 0 $metadata_offset' \
+ -c 'mread $zap_offset $zap_len'" |& filter_sigbus
+ fi
+}
+
+corruption_test 131072 0 1
+corruption_test 131072 4095 1
+corruption_test 131072 65536 65536
+corruption_test 131072 131071 1
+
+# Non-zeroed bytes in the final partial block beyond EOF should cause reads to
+# fail too. Such bytes would be visible via mmap().
+corruption_test 129999 131000 72
+
+# Hash tree corruption
+corruption_test 1048576 1052672 4096
+corruption_test 1048576 1056767 1
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/903.out b/tests/generic/903.out
new file mode 100644
index 00000000..2006cf67
--- /dev/null
+++ b/tests/generic/903.out
@@ -0,0 +1,91 @@
+QA output created by 903
+
+# Corruption test: file_len=131072 zap_offset=0 zap_len=1
+0dfbe8aa4c20b52e1b8bf3cb6cbdf193 SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading just corrupted part)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
+Validating corruption (reading just corrupted part via mmap)...
+Bus error
+
+# Corruption test: file_len=131072 zap_offset=4095 zap_len=1
+0dfbe8aa4c20b52e1b8bf3cb6cbdf193 SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading just corrupted part)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
+Validating corruption (reading just corrupted part via mmap)...
+Bus error
+
+# Corruption test: file_len=131072 zap_offset=65536 zap_len=65536
+0dfbe8aa4c20b52e1b8bf3cb6cbdf193 SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading just corrupted part)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
+Validating corruption (reading just corrupted part via mmap)...
+Bus error
+
+# Corruption test: file_len=131072 zap_offset=131071 zap_len=1
+0dfbe8aa4c20b52e1b8bf3cb6cbdf193 SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading just corrupted part)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
+Validating corruption (reading just corrupted part via mmap)...
+Bus error
+
+# Corruption test: file_len=129999 zap_offset=131000 zap_len=72
+0ed66e88b29ce0c585cedf35ee127213 SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading just corrupted part)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
+Validating corruption (reading just corrupted part via mmap)...
+Bus error
+
+# Corruption test: file_len=1048576 zap_offset=1052672 zap_len=4096
+b6d81b360a5672d80c27430f39153e2c SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
+
+# Corruption test: file_len=1048576 zap_offset=1056767 zap_len=1
+b6d81b360a5672d80c27430f39153e2c SCRATCH_MNT/file.fsv
+Corrupting bytes...
+Validating corruption (reading full file)...
+md5sum: SCRATCH_MNT/file.fsv: Input/output error
+Validating corruption (direct I/O)...
+dd: error reading 'SCRATCH_MNT/file.fsv': Input/output error
+Validating corruption (reading full file via mmap)...
+Bus error
diff --git a/tests/generic/group b/tests/generic/group
index f8f67918..0d7e0177 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -528,3 +528,4 @@
900 auto quick verity
901 auto quick verity
902 auto quick verity
+903 auto quick verity
--
2.20.0.rc2.403.gdbc3b29805-goog