btrfs: Add a test for leaking root crash at unmount time
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Message ID 20200519021331.14028-1-wqu@suse.com
State New
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Series
  • btrfs: Add a test for leaking root crash at unmount time
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Commit Message

Qu Wenruo May 19, 2020, 2:13 a.m. UTC
Test if canceled balance could lead to root leakage.
If the kernel has CONFIG_BTRFS_DEBUG compiled, unmount time root leakge
check would detect it, and cause NULL pointer dereference as the pages
of the leaked root is already freed.

The fix is titled "btrfs: relocation: Fix reloc root leakage and the NULL
 pointer reference caused by the leakage".

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 tests/btrfs/212     | 85 +++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/212.out |  2 ++
 tests/btrfs/group   |  1 +
 3 files changed, 88 insertions(+)
 create mode 100755 tests/btrfs/212
 create mode 100644 tests/btrfs/212.out

Comments

Filipe Manana May 20, 2020, 9:25 a.m. UTC | #1
On Tue, May 19, 2020 at 3:14 AM Qu Wenruo <wqu@suse.com> wrote:
>
> Test if canceled balance could lead to root leakage.
> If the kernel has CONFIG_BTRFS_DEBUG compiled, unmount time root leakge
> check would detect it, and cause NULL pointer dereference as the pages
> of the leaked root is already freed.

is -> are

>
> The fix is titled "btrfs: relocation: Fix reloc root leakage and the NULL
>  pointer reference caused by the leakage".
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
> ---
>  tests/btrfs/212     | 85 +++++++++++++++++++++++++++++++++++++++++++++
>  tests/btrfs/212.out |  2 ++
>  tests/btrfs/group   |  1 +
>  3 files changed, 88 insertions(+)
>  create mode 100755 tests/btrfs/212
>  create mode 100644 tests/btrfs/212.out
>
> diff --git a/tests/btrfs/212 b/tests/btrfs/212
> new file mode 100755
> index 00000000..4f4e177b
> --- /dev/null
> +++ b/tests/btrfs/212
> @@ -0,0 +1,85 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
> +#
> +# FS QA Test 212
> +#
> +# Test if unmounting a fs with balance canceled can lead to crash.
> +# This needs CONFIG_BTRFS_DEBUG compiled, which includes extra unmount time self-test

includes -> adds

> +#
> +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.*
> +       kill $balance_pid &> /dev/null
> +       kill $cancel_pid &> /dev/null
> +       "$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null
> +       $BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null
> +       wait
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs btrfs
> +_supported_os Linux
> +_require_scratch
> +_require_command "$KILLALL_PROG" killall
> +
> +_scratch_mkfs >> $seqres.full
> +_scratch_mount
> +
> +runtime=15
> +
> +balance_workload()
> +{
> +       trap "wait; exit" SIGTERM
> +       while true; do
> +               $BTRFS_UTIL_PROG balance start -f --full $SCRATCH_MNT &> /dev/null

Please use the helper _run_btrfs_balance_start(), it will
automatically add --full-balance if the installed btrfs-progs version
requires it.

After that you can add:

Reviewed-by: Filipe Manana <fdmanana@suse.com>

> +       done
> +}
> +
> +cancel_workload()
> +{
> +       trap "wait; exit" SIGTERM
> +       while true; do
> +               $BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null
> +               sleep 2
> +       done
> +}
> +
> +$FSSTRESS_PROG -d $SCRATCH_MNT -w -n 100000  >> $seqres.full 2>/dev/null &
> +balance_workload &
> +balance_pid=$!
> +
> +cancel_workload &
> +cancel_pid=$!
> +
> +sleep $runtime
> +
> +kill $balance_pid
> +kill $cancel_pid
> +"$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null
> +$BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null
> +wait
> +
> +echo "Silence is golden"
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/212.out b/tests/btrfs/212.out
> new file mode 100644
> index 00000000..32d11390
> --- /dev/null
> +++ b/tests/btrfs/212.out
> @@ -0,0 +1,2 @@
> +QA output created by 212
> +Silence is golden
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index 66b1beac..8d65bddd 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -214,3 +214,4 @@
>  209 auto quick log
>  210 auto quick qgroup snapshot
>  211 auto quick log prealloc
> +212 auto balance dangerous
> --
> 2.26.2
>

Patch
diff mbox series

diff --git a/tests/btrfs/212 b/tests/btrfs/212
new file mode 100755
index 00000000..4f4e177b
--- /dev/null
+++ b/tests/btrfs/212
@@ -0,0 +1,85 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
+#
+# FS QA Test 212
+#
+# Test if unmounting a fs with balance canceled can lead to crash.
+# This needs CONFIG_BTRFS_DEBUG compiled, which includes extra unmount time self-test
+#
+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.*
+	kill $balance_pid &> /dev/null
+	kill $cancel_pid &> /dev/null
+	"$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null
+	$BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null
+	wait
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs btrfs 
+_supported_os Linux
+_require_scratch
+_require_command "$KILLALL_PROG" killall
+
+_scratch_mkfs >> $seqres.full
+_scratch_mount
+
+runtime=15
+
+balance_workload()
+{
+	trap "wait; exit" SIGTERM
+	while true; do
+		$BTRFS_UTIL_PROG balance start -f --full $SCRATCH_MNT &> /dev/null
+	done
+}
+
+cancel_workload()
+{
+	trap "wait; exit" SIGTERM
+	while true; do
+		$BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null
+		sleep 2
+	done
+}
+
+$FSSTRESS_PROG -d $SCRATCH_MNT -w -n 100000  >> $seqres.full 2>/dev/null &
+balance_workload &
+balance_pid=$!
+
+cancel_workload &
+cancel_pid=$!
+
+sleep $runtime
+
+kill $balance_pid
+kill $cancel_pid
+"$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null
+$BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null
+wait
+
+echo "Silence is golden"
+# success, all done
+status=0
+exit
diff --git a/tests/btrfs/212.out b/tests/btrfs/212.out
new file mode 100644
index 00000000..32d11390
--- /dev/null
+++ b/tests/btrfs/212.out
@@ -0,0 +1,2 @@ 
+QA output created by 212
+Silence is golden
diff --git a/tests/btrfs/group b/tests/btrfs/group
index 66b1beac..8d65bddd 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -214,3 +214,4 @@ 
 209 auto quick log
 210 auto quick qgroup snapshot
 211 auto quick log prealloc
+212 auto balance dangerous