[PATCH v2] generic: test small swapfile without page-aligned contiguous blocks

[PATCH v2] generic: test small swapfile without page-aligned contiguous blocks

[Zorro Lang]

If a swapfile doesn't contain even a single page-aligned contiguous
range of blocks, it's an invalid swapfile, and might cause kernel
issue. This case covered commit 5808fecc5723 ("iomap: Fix negative
assignment to unsigned sis->pages in iomap_swapfile_activate").

Signed-off-by: Zorro Lang <zlang@redhat.com>
---

Hi,

Sorry for the late V2, I just back from a longtime sick leave. V2 accord
to the review points from djwong:
  https://lore.kernel.org/fstests/20210525160907.GB202095@locust/
But I didn't change the _scratch_mkfs_blocksized() helper in this patch.

CC Ritesh Harjani who's the original author of commit 5808fecc5723, and
looks like he sent another test case.

Thanks,
Zorro

 tests/generic/639     | 82 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/639.out |  2 ++
 tests/generic/group   |  1 +
 3 files changed, 85 insertions(+)
 create mode 100755 tests/generic/639
 create mode 100644 tests/generic/639.out

diff --git a/tests/generic/639 b/tests/generic/639
new file mode 100755
index 00000000..b371a6e9
--- /dev/null
+++ b/tests/generic/639
@@ -0,0 +1,82 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Red Hat Inc.  All Rights Reserved.
+#
+# FS QA Test No. 639
+#
+# Test small swapfile which doesn't contain even a single page-aligned contiguous
+# range of blocks. This case covered commit 5808fecc5723 ("iomap: Fix negative
+# assignment to unsigned sis->pages in iomap_swapfile_activate").
+#
+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
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_require_scratch
+_require_scratch_swapfile
+_require_test_program mkswap
+_require_test_program swapon
+
+make_unaligned_swapfile()
+{
+	local fname=$1
+	local n=$((psize / bsize - 1))
+
+	# Make sure the swapfile doesn't contain even a single page-aligned
+	# contiguous range of blocks. This's necessary to cover the bug
+	$XFS_IO_PROG -f -t -c "pwrite 0 $(((psize + bsize) * n))" $fname >> $seqres.full 2>&1
+	for((i=1; i<=n; i++));do
+		$XFS_IO_PROG -c "fcollapse $(((psize - bsize) * i)) $bsize" $fname
+	done
+	chmod 0600 $fname
+	$CHATTR_PROG +C $fname > /dev/null 2>&1
+	$here/src/mkswap $fname
+}
+
+_scratch_mkfs >> $seqres.full 2>&1
+_scratch_mount
+psize=`get_page_size`
+bsize=`_get_file_block_size $SCRATCH_MNT`
+# Due to we need page-unaligned blocks, so blocksize < pagesize is necessary.
+# If not, try to make a smaller enough block size
+if [ $bsize -ge $psize ];then
+	_scratch_unmount
+	_scratch_mkfs_blocksized 1024 >> $seqres.full 2>&1
+	if [ $? -ne 0 ];then
+		_notrun "Can't make filesystem block size < page size"
+	fi
+	_scratch_mount
+	bsize=`_get_file_block_size $SCRATCH_MNT`
+	if [ $bsize -ne 1024 ];then
+		_notrun "1024 block size is necessary"
+	fi
+fi
+swapfile=$SCRATCH_MNT/$seq.swapfile
+make_unaligned_swapfile $swapfile
+$here/src/swapon $swapfile
+swapoff $swapfile
+
+echo "Silence is golden"
+# success, all done
+status=0
+exit
diff --git a/tests/generic/639.out b/tests/generic/639.out
new file mode 100644
index 00000000..62c66537
--- /dev/null
+++ b/tests/generic/639.out
@@ -0,0 +1,2 @@
+QA output created by 639
+Silence is golden
diff --git a/tests/generic/group b/tests/generic/group
index 9a636b23..48ffa3c7 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -641,3 +641,4 @@
 636 auto quick swap
 637 auto quick dir
 638 auto quick rw
+639 auto quick swap
-- 
2.31.1

Re: [PATCH v2] generic: test small swapfile without page-aligned contiguous blocks

[Darrick J. Wong]

On Wed, Jun 16, 2021 at 12:11:28AM +0800, Zorro Lang wrote:
> If a swapfile doesn't contain even a single page-aligned contiguous
> range of blocks, it's an invalid swapfile, and might cause kernel
> issue. This case covered commit 5808fecc5723 ("iomap: Fix negative
> assignment to unsigned sis->pages in iomap_swapfile_activate").
> 
> Signed-off-by: Zorro Lang <zlang@redhat.com>
> ---
> 
> Hi,
> 
> Sorry for the late V2, I just back from a longtime sick leave. V2 accord

:( I hope you're doing better!

> to the review points from djwong:
>   https://lore.kernel.org/fstests/20210525160907.GB202095@locust/
> But I didn't change the _scratch_mkfs_blocksized() helper in this patch.
> 
> CC Ritesh Harjani who's the original author of commit 5808fecc5723, and
> looks like he sent another test case.
> 
> Thanks,
> Zorro
> 
>  tests/generic/639     | 82 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/639.out |  2 ++
>  tests/generic/group   |  1 +
>  3 files changed, 85 insertions(+)
>  create mode 100755 tests/generic/639
>  create mode 100644 tests/generic/639.out
> 
> diff --git a/tests/generic/639 b/tests/generic/639
> new file mode 100755
> index 00000000..b371a6e9
> --- /dev/null
> +++ b/tests/generic/639
> @@ -0,0 +1,82 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2021 Red Hat Inc.  All Rights Reserved.
> +#
> +# FS QA Test No. 639
> +#
> +# Test small swapfile which doesn't contain even a single page-aligned contiguous
> +# range of blocks. This case covered commit 5808fecc5723 ("iomap: Fix negative
> +# assignment to unsigned sis->pages in iomap_swapfile_activate").
> +#
> +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
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +_supported_fs generic
> +_require_scratch
> +_require_scratch_swapfile
> +_require_test_program mkswap
> +_require_test_program swapon
> +
> +make_unaligned_swapfile()
> +{
> +	local fname=$1
> +	local n=$((psize / bsize - 1))
> +
> +	# Make sure the swapfile doesn't contain even a single page-aligned
> +	# contiguous range of blocks. This's necessary to cover the bug
> +	$XFS_IO_PROG -f -t -c "pwrite 0 $(((psize + bsize) * n))" $fname >> $seqres.full 2>&1
> +	for((i=1; i<=n; i++));do
> +		$XFS_IO_PROG -c "fcollapse $(((psize - bsize) * i)) $bsize" $fname
> +	done

_require_xfs_io_command fcollapse

is needed above.

> +	chmod 0600 $fname
> +	$CHATTR_PROG +C $fname > /dev/null 2>&1
> +	$here/src/mkswap $fname
> +}
> +
> +_scratch_mkfs >> $seqres.full 2>&1
> +_scratch_mount
> +psize=`get_page_size`
> +bsize=`_get_file_block_size $SCRATCH_MNT`
> +# Due to we need page-unaligned blocks, so blocksize < pagesize is necessary.
> +# If not, try to make a smaller enough block size
> +if [ $bsize -ge $psize ];then
> +	_scratch_unmount
> +	_scratch_mkfs_blocksized 1024 >> $seqres.full 2>&1
> +	if [ $? -ne 0 ];then
> +		_notrun "Can't make filesystem block size < page size"
> +	fi
> +	_scratch_mount
> +	bsize=`_get_file_block_size $SCRATCH_MNT`
> +	if [ $bsize -ne 1024 ];then
> +		_notrun "1024 block size is necessary"

This error message probably should have a little more context.

	_notrun "Could not force 1024-byte file block size."

The logic in the test looks good to me now.

--D

> +	fi
> +fi
> +swapfile=$SCRATCH_MNT/$seq.swapfile
> +make_unaligned_swapfile $swapfile
> +$here/src/swapon $swapfile
> +swapoff $swapfile
> +
> +echo "Silence is golden"
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/639.out b/tests/generic/639.out
> new file mode 100644
> index 00000000..62c66537
> --- /dev/null
> +++ b/tests/generic/639.out
> @@ -0,0 +1,2 @@
> +QA output created by 639
> +Silence is golden
> diff --git a/tests/generic/group b/tests/generic/group
> index 9a636b23..48ffa3c7 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -641,3 +641,4 @@
>  636 auto quick swap
>  637 auto quick dir
>  638 auto quick rw
> +639 auto quick swap
> -- 
> 2.31.1
> 

Re: [PATCH v2] generic: test small swapfile without page-aligned contiguous blocks

[Zorro Lang]

On Wed, Jun 16, 2021 at 05:17:48PM -0700, Darrick J. Wong wrote:
> On Wed, Jun 16, 2021 at 12:11:28AM +0800, Zorro Lang wrote:
> > If a swapfile doesn't contain even a single page-aligned contiguous
> > range of blocks, it's an invalid swapfile, and might cause kernel
> > issue. This case covered commit 5808fecc5723 ("iomap: Fix negative
> > assignment to unsigned sis->pages in iomap_swapfile_activate").
> > 
> > Signed-off-by: Zorro Lang <zlang@redhat.com>
> > ---
> > 
> > Hi,
> > 
> > Sorry for the late V2, I just back from a longtime sick leave. V2 accord
> 
> :( I hope you're doing better!

Thanks, feel better now, trying to catch what I missed :)

> 
> > to the review points from djwong:
> >   https://lore.kernel.org/fstests/20210525160907.GB202095@locust/
> > But I didn't change the _scratch_mkfs_blocksized() helper in this patch.
> > 
> > CC Ritesh Harjani who's the original author of commit 5808fecc5723, and
> > looks like he sent another test case.
> > 
> > Thanks,
> > Zorro
> > 
> >  tests/generic/639     | 82 +++++++++++++++++++++++++++++++++++++++++++
> >  tests/generic/639.out |  2 ++
> >  tests/generic/group   |  1 +
> >  3 files changed, 85 insertions(+)
> >  create mode 100755 tests/generic/639
> >  create mode 100644 tests/generic/639.out
> > 
> > diff --git a/tests/generic/639 b/tests/generic/639
> > new file mode 100755
> > index 00000000..b371a6e9
> > --- /dev/null
> > +++ b/tests/generic/639
> > @@ -0,0 +1,82 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2021 Red Hat Inc.  All Rights Reserved.
> > +#
> > +# FS QA Test No. 639
> > +#
> > +# Test small swapfile which doesn't contain even a single page-aligned contiguous
> > +# range of blocks. This case covered commit 5808fecc5723 ("iomap: Fix negative
> > +# assignment to unsigned sis->pages in iomap_swapfile_activate").
> > +#
> > +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
> > +
> > +# remove previous $seqres.full before test
> > +rm -f $seqres.full
> > +
> > +# real QA test starts here
> > +_supported_fs generic
> > +_require_scratch
> > +_require_scratch_swapfile
> > +_require_test_program mkswap
> > +_require_test_program swapon
> > +
> > +make_unaligned_swapfile()
> > +{
> > +	local fname=$1
> > +	local n=$((psize / bsize - 1))
> > +
> > +	# Make sure the swapfile doesn't contain even a single page-aligned
> > +	# contiguous range of blocks. This's necessary to cover the bug
> > +	$XFS_IO_PROG -f -t -c "pwrite 0 $(((psize + bsize) * n))" $fname >> $seqres.full 2>&1
> > +	for((i=1; i<=n; i++));do
> > +		$XFS_IO_PROG -c "fcollapse $(((psize - bsize) * i)) $bsize" $fname
> > +	done
> 
> _require_xfs_io_command fcollapse

Sure,

> 
> is needed above.
> 
> > +	chmod 0600 $fname
> > +	$CHATTR_PROG +C $fname > /dev/null 2>&1
> > +	$here/src/mkswap $fname
> > +}
> > +
> > +_scratch_mkfs >> $seqres.full 2>&1
> > +_scratch_mount
> > +psize=`get_page_size`
> > +bsize=`_get_file_block_size $SCRATCH_MNT`
> > +# Due to we need page-unaligned blocks, so blocksize < pagesize is necessary.
> > +# If not, try to make a smaller enough block size
> > +if [ $bsize -ge $psize ];then
> > +	_scratch_unmount
> > +	_scratch_mkfs_blocksized 1024 >> $seqres.full 2>&1
> > +	if [ $? -ne 0 ];then
> > +		_notrun "Can't make filesystem block size < page size"
> > +	fi
> > +	_scratch_mount
> > +	bsize=`_get_file_block_size $SCRATCH_MNT`
> > +	if [ $bsize -ne 1024 ];then
> > +		_notrun "1024 block size is necessary"
> 
> This error message probably should have a little more context.
> 
> 	_notrun "Could not force 1024-byte file block size."

Sure. If I don't need to wait your patchset (about new grouplist), I'll change
this case now.

Thanks,
Zorro

> 
> The logic in the test looks good to me now.
> 
> --D
> 
> > +	fi
> > +fi
> > +swapfile=$SCRATCH_MNT/$seq.swapfile
> > +make_unaligned_swapfile $swapfile
> > +$here/src/swapon $swapfile
> > +swapoff $swapfile
> > +
> > +echo "Silence is golden"
> > +# success, all done
> > +status=0
> > +exit
> > diff --git a/tests/generic/639.out b/tests/generic/639.out
> > new file mode 100644
> > index 00000000..62c66537
> > --- /dev/null
> > +++ b/tests/generic/639.out
> > @@ -0,0 +1,2 @@
> > +QA output created by 639
> > +Silence is golden
> > diff --git a/tests/generic/group b/tests/generic/group
> > index 9a636b23..48ffa3c7 100644
> > --- a/tests/generic/group
> > +++ b/tests/generic/group
> > @@ -641,3 +641,4 @@
> >  636 auto quick swap
> >  637 auto quick dir
> >  638 auto quick rw
> > +639 auto quick swap
> > -- 
> > 2.31.1
> > 
> 

Re: [PATCH v2] generic: test small swapfile without page-aligned contiguous blocks

[Darrick J. Wong]

On Thu, Jun 17, 2021 at 10:27:32AM +0800, Zorro Lang wrote:
> On Wed, Jun 16, 2021 at 05:17:48PM -0700, Darrick J. Wong wrote:
> > On Wed, Jun 16, 2021 at 12:11:28AM +0800, Zorro Lang wrote:
> > > If a swapfile doesn't contain even a single page-aligned contiguous
> > > range of blocks, it's an invalid swapfile, and might cause kernel
> > > issue. This case covered commit 5808fecc5723 ("iomap: Fix negative
> > > assignment to unsigned sis->pages in iomap_swapfile_activate").
> > > 
> > > Signed-off-by: Zorro Lang <zlang@redhat.com>
> > > ---
> > > 
> > > Hi,
> > > 
> > > Sorry for the late V2, I just back from a longtime sick leave. V2 accord
> > 
> > :( I hope you're doing better!
> 
> Thanks, feel better now, trying to catch what I missed :)
> 
> > 
> > > to the review points from djwong:
> > >   https://lore.kernel.org/fstests/20210525160907.GB202095@locust/
> > > But I didn't change the _scratch_mkfs_blocksized() helper in this patch.
> > > 
> > > CC Ritesh Harjani who's the original author of commit 5808fecc5723, and
> > > looks like he sent another test case.
> > > 
> > > Thanks,
> > > Zorro
> > > 
> > >  tests/generic/639     | 82 +++++++++++++++++++++++++++++++++++++++++++
> > >  tests/generic/639.out |  2 ++
> > >  tests/generic/group   |  1 +
> > >  3 files changed, 85 insertions(+)
> > >  create mode 100755 tests/generic/639
> > >  create mode 100644 tests/generic/639.out
> > > 
> > > diff --git a/tests/generic/639 b/tests/generic/639
> > > new file mode 100755
> > > index 00000000..b371a6e9
> > > --- /dev/null
> > > +++ b/tests/generic/639
> > > @@ -0,0 +1,82 @@
> > > +#! /bin/bash
> > > +# SPDX-License-Identifier: GPL-2.0
> > > +# Copyright (c) 2021 Red Hat Inc.  All Rights Reserved.
> > > +#
> > > +# FS QA Test No. 639
> > > +#
> > > +# Test small swapfile which doesn't contain even a single page-aligned contiguous
> > > +# range of blocks. This case covered commit 5808fecc5723 ("iomap: Fix negative
> > > +# assignment to unsigned sis->pages in iomap_swapfile_activate").
> > > +#
> > > +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
> > > +
> > > +# remove previous $seqres.full before test
> > > +rm -f $seqres.full
> > > +
> > > +# real QA test starts here
> > > +_supported_fs generic
> > > +_require_scratch
> > > +_require_scratch_swapfile
> > > +_require_test_program mkswap
> > > +_require_test_program swapon
> > > +
> > > +make_unaligned_swapfile()
> > > +{
> > > +	local fname=$1
> > > +	local n=$((psize / bsize - 1))
> > > +
> > > +	# Make sure the swapfile doesn't contain even a single page-aligned
> > > +	# contiguous range of blocks. This's necessary to cover the bug
> > > +	$XFS_IO_PROG -f -t -c "pwrite 0 $(((psize + bsize) * n))" $fname >> $seqres.full 2>&1
> > > +	for((i=1; i<=n; i++));do
> > > +		$XFS_IO_PROG -c "fcollapse $(((psize - bsize) * i)) $bsize" $fname
> > > +	done
> > 
> > _require_xfs_io_command fcollapse
> 
> Sure,
> 
> > 
> > is needed above.
> > 
> > > +	chmod 0600 $fname
> > > +	$CHATTR_PROG +C $fname > /dev/null 2>&1
> > > +	$here/src/mkswap $fname
> > > +}
> > > +
> > > +_scratch_mkfs >> $seqres.full 2>&1
> > > +_scratch_mount
> > > +psize=`get_page_size`
> > > +bsize=`_get_file_block_size $SCRATCH_MNT`
> > > +# Due to we need page-unaligned blocks, so blocksize < pagesize is necessary.
> > > +# If not, try to make a smaller enough block size
> > > +if [ $bsize -ge $psize ];then
> > > +	_scratch_unmount
> > > +	_scratch_mkfs_blocksized 1024 >> $seqres.full 2>&1
> > > +	if [ $? -ne 0 ];then
> > > +		_notrun "Can't make filesystem block size < page size"
> > > +	fi
> > > +	_scratch_mount
> > > +	bsize=`_get_file_block_size $SCRATCH_MNT`
> > > +	if [ $bsize -ne 1024 ];then
> > > +		_notrun "1024 block size is necessary"
> > 
> > This error message probably should have a little more context.
> > 
> > 	_notrun "Could not force 1024-byte file block size."
> 
> Sure. If I don't need to wait your patchset (about new grouplist), I'll change
> this case now.

Nah, that whole patchset is at least another week (and reposting) away.

--D

> Thanks,
> Zorro
> 
> > 
> > The logic in the test looks good to me now.
> > 
> > --D
> > 
> > > +	fi
> > > +fi
> > > +swapfile=$SCRATCH_MNT/$seq.swapfile
> > > +make_unaligned_swapfile $swapfile
> > > +$here/src/swapon $swapfile
> > > +swapoff $swapfile
> > > +
> > > +echo "Silence is golden"
> > > +# success, all done
> > > +status=0
> > > +exit
> > > diff --git a/tests/generic/639.out b/tests/generic/639.out
> > > new file mode 100644
> > > index 00000000..62c66537
> > > --- /dev/null
> > > +++ b/tests/generic/639.out
> > > @@ -0,0 +1,2 @@
> > > +QA output created by 639
> > > +Silence is golden
> > > diff --git a/tests/generic/group b/tests/generic/group
> > > index 9a636b23..48ffa3c7 100644
> > > --- a/tests/generic/group
> > > +++ b/tests/generic/group
> > > @@ -641,3 +641,4 @@
> > >  636 auto quick swap
> > >  637 auto quick dir
> > >  638 auto quick rw
> > > +639 auto quick swap
> > > -- 
> > > 2.31.1
> > > 
> > 
>