2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2017 Fujitsu. All Rights Reserved.
7 # Regression test for commit:
8 # 3a4b77c ("ext4: validate s_first_meta_bg at mount time").
11 seqres=$RESULT_DIR/$seq
12 echo "QA output created by $seq"
15 status=1 # failure is the default!
16 trap "_cleanup; exit \$status" 0 1 2 3 15
23 # get standard environment and checks
27 # remove previous $seqres.full before test
30 # real QA test starts here
32 _require_scratch_nocheck
33 _require_command "$DEBUGFS_PROG" debugfs
34 _require_scratch_ext4_feature "bigalloc,meta_bg,^resize_inode"
36 echo "Create ext4 fs and modify first_meta_bg's value"
37 _scratch_mkfs "-O bigalloc,meta_bg,^resize_inode" >> $seqres.full 2>&1
39 # set a big enough first_meta_bg to trigger buffer overrun
40 # 842150400 is from original fuzzed ext4 image in bug report
41 $DEBUGFS_PROG -w -R "ssv first_meta_bg 842150400" $SCRATCH_DEV >> $seqres.full 2>&1
43 echo "Try to mount a modified ext4 fs"
44 _try_scratch_mount >> $seqres.full 2>&1 || echo "Fail to mount ext4 fs expectedly"