From: Xiao Yang Date: Fri, 21 Apr 2017 10:10:39 +0000 (+0800) Subject: ext4: check mount's handling for very large s_first_meta_bg X-Git-Tag: v2022.05.01~2081 X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=427db760cfc78d6b09bf0eda41c971b65b5cc97e;p=xfstests-dev.git ext4: check mount's handling for very large s_first_meta_bg On ext4 filesystem, the kernel carshes at mount time when s_first_meta_bg's value exceeds the largest possible meta_bg number. This kernel bug has been fixed in: 3a4b77c ext4: validate s_first_meta_bg at mount time [eguan: add comments on the first_meta_bg value] Signed-off-by: Xiao Yang Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- diff --git a/tests/ext4/025 b/tests/ext4/025 new file mode 100755 index 00000000..49ecb462 --- /dev/null +++ b/tests/ext4/025 @@ -0,0 +1,65 @@ +#! /bin/bash +# FS QA Test ext4/025 +# +# Regression test for commit: +# 3a4b77c ("ext4: validate s_first_meta_bg at mount time"). +# +#----------------------------------------------------------------------- +# Copyright (c) 2017 Fujitsu. All Rights Reserved. +# Author: Xiao Yang +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- + + +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" + +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + rm -f $tmp.* +} + +# get standard environment and checks +. ./common/rc +. ./common/filter + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here +_supported_fs ext4 +_supported_os Linux +_require_scratch_nocheck +_require_command "$DEBUGFS_PROG" debugfs +_require_ext4_mkfs_feature "bigalloc,meta_bg,^resize_inode" + +echo "Create ext4 fs and modify first_meta_bg's value" +_scratch_mkfs "-O bigalloc,meta_bg,^resize_inode" >> $seqres.full 2>&1 + +# set a big enough first_meta_bg to trigger buffer overrun +# 842150400 is from original fuzzed ext4 image in bug report +$DEBUGFS_PROG -w -R "ssv first_meta_bg 842150400" $SCRATCH_DEV >> $seqres.full 2>&1 + +echo "Try to mount a modified ext4 fs" +_scratch_mount >> $seqres.full 2>&1 || echo "Fail to mount ext4 fs expectedly" + +# success, all done +status=0 +exit diff --git a/tests/ext4/025.out b/tests/ext4/025.out new file mode 100644 index 00000000..f9a76bbb --- /dev/null +++ b/tests/ext4/025.out @@ -0,0 +1,4 @@ +QA output created by 025 +Create ext4 fs and modify first_meta_bg's value +Try to mount a modified ext4 fs +Fail to mount ext4 fs expectedly diff --git a/tests/ext4/group b/tests/ext4/group index cac5aa5d..664c0591 100644 --- a/tests/ext4/group +++ b/tests/ext4/group @@ -27,6 +27,7 @@ 022 auto quick attr dangerous 023 auto quick scrub 024 auto quick encrypt dangerous +025 auto quick fuzzers dangerous 271 auto rw quick 301 aio auto ioctl rw stress defrag 302 aio auto ioctl rw stress defrag