[Qemu-devel] [PATCH v5] vmdk: Fix integer overflow in offset calculation

[Qemu-devel] [PATCH v5] vmdk: Fix integer overflow in offset calculation

[Fam Zheng]

This fixes the bug introduced by commit c6ac36e (vmdk: Optimize cluster
allocation).

$ ~/build/master/qemu-io /stor/vm/arch.vmdk -c 'write 2G 1k'
write failed: Invalid argument

Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>

---
v5: Fix group file and output reference. (Max)
v4: Fix typo in file header: 1014 -> 2014.
v3: A new case 105 instead of embedding in 005. (Max)
---
 block/vmdk.c               |  2 +-
 tests/qemu-iotests/105     | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/105.out | 21 ++++++++++++++
 tests/qemu-iotests/group   |  1 +
 4 files changed, 93 insertions(+), 1 deletion(-)
 create mode 100755 tests/qemu-iotests/105
 create mode 100644 tests/qemu-iotests/105.out

diff --git a/block/vmdk.c b/block/vmdk.c
index afdea1a..4ae6c75 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1113,7 +1113,7 @@ static int get_cluster_offset(BlockDriverState *bs,
     uint32_t min_count, *l2_table;
     bool zeroed = false;
     int64_t ret;
-    int32_t cluster_sector;
+    int64_t cluster_sector;
 
     if (m_data) {
         m_data->valid = 0;
diff --git a/tests/qemu-iotests/105 b/tests/qemu-iotests/105
new file mode 100755
index 0000000..9bae49e
--- /dev/null
+++ b/tests/qemu-iotests/105
@@ -0,0 +1,70 @@
+#!/bin/bash
+#
+# Create, read, write big image
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# 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; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=famz@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+	_cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2 vmdk vhdx qed
+_supported_proto generic
+_supported_os Linux
+_unsupported_imgopts "subformat=twoGbMaxExtentFlat" \
+                     "subformat=twoGbMaxExtentSparse"
+
+echo
+echo "creating large image"
+_make_test_img 16T
+
+echo
+echo "small read"
+$QEMU_IO -c "read 1024 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small write"
+$QEMU_IO -c "write 8192 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small read at high offset"
+$QEMU_IO -c "read 14T 4096" "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "small write at high offset"
+$QEMU_IO -c "write 14T 4096" "$TEST_IMG" | _filter_qemu_io
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/105.out b/tests/qemu-iotests/105.out
new file mode 100644
index 0000000..13ffcb5
--- /dev/null
+++ b/tests/qemu-iotests/105.out
@@ -0,0 +1,21 @@
+QA output created by 105
+
+creating large image
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=17592186044416
+
+small read
+read 4096/4096 bytes at offset 1024
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+small write
+wrote 4096/4096 bytes at offset 8192
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+small read at high offset
+read 4096/4096 bytes at offset 15393162788864
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+small write at high offset
+wrote 4096/4096 bytes at offset 15393162788864
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+*** done
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 622685e..b230996 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -105,3 +105,4 @@
 101 rw auto quick
 103 rw auto quick
 104 rw auto
+105 rw auto quick
-- 
1.9.3

Re: [Qemu-devel] [PATCH v5] vmdk: Fix integer overflow in offset calculation

[Stefan Hajnoczi]

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On Tue, Sep 23, 2014 at 09:56:21AM +0800, Fam Zheng wrote:
> This fixes the bug introduced by commit c6ac36e (vmdk: Optimize cluster
> allocation).
> 
> $ ~/build/master/qemu-io /stor/vm/arch.vmdk -c 'write 2G 1k'
> write failed: Invalid argument
> 
> Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> Reviewed-by: Max Reitz <mreitz@redhat.com>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> 
> ---
> v5: Fix group file and output reference. (Max)
> v4: Fix typo in file header: 1014 -> 2014.
> v3: A new case 105 instead of embedding in 005. (Max)
> ---
>  block/vmdk.c               |  2 +-
>  tests/qemu-iotests/105     | 70 ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/105.out | 21 ++++++++++++++
>  tests/qemu-iotests/group   |  1 +
>  4 files changed, 93 insertions(+), 1 deletion(-)
>  create mode 100755 tests/qemu-iotests/105
>  create mode 100644 tests/qemu-iotests/105.out

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan

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