diff mbox

fstests: test xfs rw remount with unknown ro-compat features

Message ID 1472309497-11351-1-git-send-email-zlang@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Zorro Lang Aug. 27, 2016, 2:51 p.m. UTC
Although ro-compat features cannot be mounted rw, a bug allows
an ro->rw remount transition, and this will corrupt the filesystem
if it contains ro-compat features unknown to the running kernel.

This bug has been fix on linux kernel (d0a58e8 xfs: disallow rw
remount on fs with unknown ro-compat features), this case is
the regression testcase of that bug.

Signed-off-by: Zorro Lang <zlang@redhat.com>
---
 tests/xfs/263     | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/263.out |  6 ++++
 tests/xfs/group   |  1 +
 3 files changed, 106 insertions(+)
 create mode 100755 tests/xfs/263
 create mode 100644 tests/xfs/263.out

Comments

Zorro Lang Aug. 27, 2016, 3:24 p.m. UTC | #1
On Sat, Aug 27, 2016 at 10:51:37PM +0800, Zorro Lang wrote:
> Although ro-compat features cannot be mounted rw, a bug allows
> an ro->rw remount transition, and this will corrupt the filesystem
> if it contains ro-compat features unknown to the running kernel.
> 
> This bug has been fix on linux kernel (d0a58e8 xfs: disallow rw
> remount on fs with unknown ro-compat features), this case is
> the regression testcase of that bug.
> 
> Signed-off-by: Zorro Lang <zlang@redhat.com>
> ---
>  tests/xfs/263     | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/xfs/263.out |  6 ++++
>  tests/xfs/group   |  1 +
>  3 files changed, 106 insertions(+)
>  create mode 100755 tests/xfs/263
>  create mode 100644 tests/xfs/263.out
> 
> diff --git a/tests/xfs/263 b/tests/xfs/263
> new file mode 100755
> index 0000000..b934e9f
> --- /dev/null
> +++ b/tests/xfs/263
> @@ -0,0 +1,99 @@
> +#! /bin/bash
> +# FS QA Test 263
> +#
> +# Test upstream d0a58e8:
> +#   xfs: disallow rw remount on fs with unknown ro-compat features
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2016 Red Hat, Inc.  All Rights Reserved.
> +#
> +# 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"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +	# Due to we've broken the superblock of SCRATCH_DEV by
> +	# xfs_db, so clean bad superblock at the end
> +	_scratch_unmount
> +	_scratch_mkfs >/dev/null 2>&1
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +_supported_fs xfs
> +_supported_os Linux
> +_require_scratch
> +_require_xfs_crc
> +
> +# Only V5 XFS disallow rw mount/remount with unknown ro-compat
> +# features
> +MKFS_OPTIONS="-m crc=1"
> +_scratch_mkfs_xfs >>$seqres.full 2>&1
> +
> +# set the highest bit of features_ro_compat, use it as an unknown
> +# feature bit. If one day this bit become known feature, please
> +# change this case.
> +$XFS_DB_PROG -x -c "sb 0" \
> +                -c "write features_ro_compat $((2**31))" \
> +		$SCRATCH_DEV
> +
> +echo "rw mount test"
> +# Generally this mount failed as bad superblock
> +# But still keep testing this
> +MOUNT_OPTIONS="-o rw"
> +_scratch_mount 2>>$seqres.full
> +if [ $? -eq 0 ]; then
> +	_fail "rw mount test failed"
> +fi
> +
> +echo "ro mount test"
> +MOUNT_OPTIONS="-o ro"
> +_scratch_mount
> +if [ $? -ne 0 ]; then
> +	_fail "ro mount test failed"
> +else
> +	# no hang/panic is fine
> +	$FSSTRESS_PROG -d $SCRATCH_MNT -p 4 -n 400 >>$seqres.full 2>&1
> +fi
> +
> +dmesg -c >/dev/null
> +echo "rw remount test"
> +MOUNT_OPTIONS="-o rw,remount"
> +_scratch_mount 2>>$seqres.full
> +if [ $? -eq 0 ]; then
> +	_fail "rw,remount test failed"
> +fi
> +dmesg -c | sed -n -e "s/.*XFS.*: \(ro->rw transition prohibited.*\)/\1/p"
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/xfs/263.out b/tests/xfs/263.out
> new file mode 100644
> index 0000000..974e02f
> --- /dev/null
> +++ b/tests/xfs/263.out
> @@ -0,0 +1,6 @@
> +QA output created by 263
> +features_ro_compat = 0x80000000
> +rw mount test
> +ro mount test
> +rw remount test
> +mount: cannot remount LOOP_IMG read-write, is write-protected

Sorry, please ignore this patch. I forgot to update the .out file.
I'll send a V2 to fix this problem.

Thanks,
Zorro

> diff --git a/tests/xfs/group b/tests/xfs/group
> index 6905a62..ec3c022 100644
> --- a/tests/xfs/group
> +++ b/tests/xfs/group
> @@ -260,6 +260,7 @@
>  260 auto quick quota
>  261 auto quick quota
>  262 auto quick quota
> +263 auto quick mount
>  265 auto clone
>  266 dump ioctl auto quick
>  267 dump ioctl tape
> -- 
> 2.7.4
> 
> --
> To unsubscribe from this list: send the line "unsubscribe fstests" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe fstests" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/tests/xfs/263 b/tests/xfs/263
new file mode 100755
index 0000000..b934e9f
--- /dev/null
+++ b/tests/xfs/263
@@ -0,0 +1,99 @@ 
+#! /bin/bash
+# FS QA Test 263
+#
+# Test upstream d0a58e8:
+#   xfs: disallow rw remount on fs with unknown ro-compat features
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2016 Red Hat, Inc.  All Rights Reserved.
+#
+# 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"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	rm -f $tmp.*
+	# Due to we've broken the superblock of SCRATCH_DEV by
+	# xfs_db, so clean bad superblock at the end
+	_scratch_unmount
+	_scratch_mkfs >/dev/null 2>&1
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs xfs
+_supported_os Linux
+_require_scratch
+_require_xfs_crc
+
+# Only V5 XFS disallow rw mount/remount with unknown ro-compat
+# features
+MKFS_OPTIONS="-m crc=1"
+_scratch_mkfs_xfs >>$seqres.full 2>&1
+
+# set the highest bit of features_ro_compat, use it as an unknown
+# feature bit. If one day this bit become known feature, please
+# change this case.
+$XFS_DB_PROG -x -c "sb 0" \
+                -c "write features_ro_compat $((2**31))" \
+		$SCRATCH_DEV
+
+echo "rw mount test"
+# Generally this mount failed as bad superblock
+# But still keep testing this
+MOUNT_OPTIONS="-o rw"
+_scratch_mount 2>>$seqres.full
+if [ $? -eq 0 ]; then
+	_fail "rw mount test failed"
+fi
+
+echo "ro mount test"
+MOUNT_OPTIONS="-o ro"
+_scratch_mount
+if [ $? -ne 0 ]; then
+	_fail "ro mount test failed"
+else
+	# no hang/panic is fine
+	$FSSTRESS_PROG -d $SCRATCH_MNT -p 4 -n 400 >>$seqres.full 2>&1
+fi
+
+dmesg -c >/dev/null
+echo "rw remount test"
+MOUNT_OPTIONS="-o rw,remount"
+_scratch_mount 2>>$seqres.full
+if [ $? -eq 0 ]; then
+	_fail "rw,remount test failed"
+fi
+dmesg -c | sed -n -e "s/.*XFS.*: \(ro->rw transition prohibited.*\)/\1/p"
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/263.out b/tests/xfs/263.out
new file mode 100644
index 0000000..974e02f
--- /dev/null
+++ b/tests/xfs/263.out
@@ -0,0 +1,6 @@ 
+QA output created by 263
+features_ro_compat = 0x80000000
+rw mount test
+ro mount test
+rw remount test
+mount: cannot remount LOOP_IMG read-write, is write-protected
diff --git a/tests/xfs/group b/tests/xfs/group
index 6905a62..ec3c022 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -260,6 +260,7 @@ 
 260 auto quick quota
 261 auto quick quota
 262 auto quick quota
+263 auto quick mount
 265 auto clone
 266 dump ioctl auto quick
 267 dump ioctl tape